/* ==========================================================
   高考AI Tutor Pro · 完整样式
   配色：清爽浅色 + 蓝紫主色，学生长时间使用不刺眼
   ========================================================== */

:root {
  --bg: #f3f5fa;
  --panel: #ffffff;
  --card-bg: #ffffff;
  --primary: #4f6ef7;
  --primary-dark: #3d58e0;
  --primary-soft: #eef1fe;
  --text: #1f2430;
  --muted: #8a93a6;
  --border: #e7ebf2;
  --hover-bg: #f4f6fb;
  --user-bubble: linear-gradient(135deg, #4f6ef7, #6a5cf0);
  --ai-bubble: var(--card-bg, #ffffff);
  --danger: #e5484d;
  --success: #30a46c;

  /* 柔化阴影（线D4 再柔一层：双层阴影，近实远虚，弱化硬边框） */
  --shadow-sm: 0 1px 3px rgba(31, 42, 68, 0.04), 0 2px 10px rgba(31, 42, 68, 0.05);
  --shadow-md: 0 2px 6px rgba(31, 42, 68, 0.05), 0 8px 24px rgba(31, 42, 68, 0.09);
  --shadow-lg: 0 4px 10px rgba(31, 42, 68, 0.06), 0 16px 40px rgba(31, 42, 68, 0.13);
  /* 悬浮层专用（输入条/浮层卡片）：更明显的层次感但更柔 */
  --shadow-float: 0 6px 16px rgba(31, 42, 68, 0.08), 0 18px 48px rgba(31, 42, 68, 0.14);

  /* 圆角分级（线D4 升级：卡片 16-20 / 按钮输入框 10-14 / 气泡 18） */
  --radius-xs: 8px;
  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 20px;

  /* 用户气泡渐变（RikkaHub 蓝紫渐变 + 顶部玻璃高光） */
  --user-grad:
    linear-gradient(180deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0) 45%),
    linear-gradient(135deg, #4f6ef7 0%, #5f6cf5 55%, #6a5cf0 100%);
  /* 发送按钮渐变 */
  --send-grad:
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0) 50%),
    linear-gradient(135deg, #4f6ef7 0%, #5f6cf5 55%, #6a5cf0 100%);

  /* 过渡时长 */
  --t-fast: 0.15s;
  --t: 0.2s;
  /* 选项卡指示器滑动（Material 弹跳缓动） */
  --t-spring: 0.28s cubic-bezier(0.22, 0.8, 0.24, 1);

  /* 柔和 focus 光环 */
  --focus-ring: rgba(79, 110, 247, 0.14);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

/* 关键修复：作者样式的 display 会覆盖 HTML hidden 属性，
   导致"关不掉的透明遮罩"挡住整个页面。此规则强制 hidden 生效。 */
[hidden] { display: none !important; }

/* ==========================================================
   UI 柔化基础（线D2 2026-08-18）：
   柔和 focus、细窄滚动条、页面淡入、选中色、降动效
   ========================================================== */

html { scrollbar-color: rgba(120, 132, 160, 0.38) transparent; scrollbar-width: thin; }

/* 全站细窄滚动条（WebKit：圆角轨道 + 半透明 thumb，hover 加深） */
* { scrollbar-width: thin; scrollbar-color: rgba(120, 132, 160, 0.38) transparent; }
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-track { background: transparent; border-radius: 8px; }
*::-webkit-scrollbar-thumb {
  background: rgba(120, 132, 160, 0.32);
  border-radius: 8px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
*::-webkit-scrollbar-thumb:hover { background-color: rgba(120, 132, 160, 0.55); }
*::-webkit-scrollbar-thumb:active { background-color: rgba(120, 132, 160, 0.7); }
*::-webkit-scrollbar-corner { background: transparent; }

/* 键盘导航的柔和 focus 光环（替代生硬默认框） */
:focus-visible {
  outline: 2px solid rgba(79, 110, 247, 0.5);
  outline-offset: 2px;
  border-radius: 8px;
}

/* 页面切换淡入（hidden 切换触发） */
@keyframes pageFade {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: none; }
}
.page { animation: pageFade 0.2s ease; }

/* 文本选中色与触摸高亮 */
::selection { background: rgba(79, 110, 247, 0.18); }
* { -webkit-tap-highlight-color: transparent; }

/* 尊重系统降动效设置 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

html, body { height: 100%; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.65;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ============ 布局 ============ */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
}

/* ---------- 顶部标签导航（5 页结构） ---------- */
#tab-nav {
  position: relative;
  flex-shrink: 0;
  display: flex;
  align-items: stretch;
  gap: 2px;
  padding: 6px 14px 0;
  /* 毛玻璃 + 顶部玻璃高光渐变（线D4：纯 CSS 光带，不动结构） */
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0.10) 68%, rgba(255, 255, 255, 0) 100%),
    rgba(255, 255, 255, 0.78);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  backdrop-filter: blur(12px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
/* 顶部渐变光带：蓝紫细线 + 柔光晕（RikkaHub 点缀） */
#tab-nav::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(79, 110, 247, 0.60), rgba(143, 123, 245, 0.60), transparent);
  box-shadow: 0 0 14px rgba(79, 110, 247, 0.28);
  pointer-events: none;
  z-index: 1;
}

.tab-btn {
  position: relative;
  padding: 10px 16px 11px;
  border: none;
  background: transparent;
  border-radius: 8px 12px 0 0;
  font-size: 14px;
  font-family: inherit;
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color var(--t), background var(--t), border-color var(--t);
}
.tab-btn:hover { color: var(--primary-dark); background: rgba(238, 241, 254, 0.75); }
.tab-btn.active {
  color: var(--primary-dark);
  font-weight: 700;
  border-bottom-color: transparent;
  background: var(--primary-soft);
}
/* 选项卡指示器：scaleX 生长滑动（纯 CSS，切换时从左展开） */
.tab-btn::after {
  content: '';
  position: absolute;
  left: 14px; right: 14px;
  bottom: -3px;
  height: 3px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--primary), #8f7bf5);
  transform: scaleX(0);
  transform-origin: left center;
  opacity: 0;
  transition: transform var(--t-spring), opacity var(--t);
  pointer-events: none;
}
.tab-btn:hover::after { opacity: 0.45; transform: scaleX(0.3); }
.tab-btn.active::after { opacity: 1; transform: scaleX(1); }

/* ---------- 页面容器 ---------- */
#pages {
  flex: 1;
  min-height: 0;
  display: flex;
}
.page {
  flex: 1;
  min-width: 0;
  min-height: 0;
  display: flex;
  overflow-x: hidden; /* 总管：页面级禁止横向滚动（标签栏/宽元素溢出由内层容器自滚，不得撑出页面） */
}

#sidebar {
  width: 264px;
  min-width: 264px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  gap: 14px;
  overflow-y: auto;
}

#chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ============ 侧边栏 ============ */
.brand {
  font-size: 17px;
  font-weight: 700;
  padding: 4px 6px 12px;
  border-bottom: 1px solid var(--border);
}

.side-section { display: flex; flex-direction: column; gap: 8px; }

.side-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.5px;
}

#subject-select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fafbfe;
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
#subject-select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }

.preset-list { display: flex; flex-direction: column; gap: 6px; }

.preset-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fafbfe;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
}
.preset-item:hover { border-color: var(--primary); background: var(--primary-soft); }
.preset-item.active {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary-dark);
  font-weight: 600;
}

/* 线CHATMODE：✍️ 批改快捷钮（讲解模式区已删，左栏仅留此钮；全 var() 化，深浅双态+12 主题包兼容） */
.preset-grade-btn {
  display: block;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
}
.preset-grade-btn:hover { border-color: var(--primary); background: var(--primary-soft); }
.preset-grade-btn.active {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary-dark);
  font-weight: 600;
}

.review-list { display: flex; flex-direction: column; gap: 6px; }

.review-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fffdf5;
  padding: 8px 10px;
  cursor: pointer;
  transition: box-shadow var(--t-fast), border-color var(--t-fast);
}
.review-item:hover { box-shadow: var(--shadow-sm); border-color: var(--primary); }
.rv-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border-radius: 8px;
  padding: 1px 7px;
  margin-right: 6px;
  white-space: nowrap;
}
.review-item .rv-point { font-size: 12px; color: var(--text); margin-top: 2px; }
.review-item .rv-hint { font-size: 11px; color: var(--muted); }

.muted { color: var(--muted); font-size: 12px; }

.side-footer { margin-top: auto; padding-top: 10px; border-top: 1px solid var(--border); }

.cost-badge {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  text-align: center;
  padding: 4px 0;
  border-radius: 8px;
  transition: all 0.15s;
}
.cost-badge:hover { color: var(--primary-dark); background: var(--primary-soft); }

.btn-ghost {
  width: 100%;
  padding: 9px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--t-fast);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary-dark); background: var(--primary-soft); }

/* ============ 聊天头部 ============ */
#chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
#header-title { font-size: 16px; font-weight: 700; }
/* 线MOBFIX：聊天头部「今日 N 道到期」徽章——默认（桌面）隐藏，窄屏显示 */
.review-badge { display: none; }

/* ============ 消息区 ============ */
#messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 22px 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scroll-behavior: smooth;
}

/* 消息进场动效：淡入 + 上移 0.25s（prefers-reduced-motion 由全局规则降级） */
@keyframes msgIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.msg { animation: msgIn 0.25s ease both; }

.msg { display: flex; flex-direction: column; max-width: 78%; min-width: 0; }
/* 左右错落更明显：用户气泡更紧凑（72%），AI 气泡更舒展（80%） */
.msg.user { align-self: flex-end; align-items: flex-end; max-width: 72%; }
.msg.ai { align-self: flex-start; align-items: flex-start; max-width: 80%; }
.msg.system { align-self: center; max-width: 90%; }

.bubble {
  padding: 12px 16px;
  border-radius: var(--radius);
  word-break: break-word;
  overflow-wrap: anywhere;
  min-width: 0;
  font-size: 15px;
  line-height: 1.7;
  transition: box-shadow var(--t);
}
/* 用户气泡：蓝紫渐变 + 白字 + 18px 圆角，尾巴在右下角（RikkaHub） */
.msg.user .bubble {
  background: var(--user-grad);
  color: #fff;
  border-radius: 8px 18px 8px 18px;
  box-shadow: 0 4px 14px rgba(79, 110, 247, 0.28);
}
/* AI 气泡：柔和卡片底 + 18px 圆角，尾巴在左下角（圆角变化暗示） */
.msg.ai .bubble {
  background: var(--ai-bubble);
  border-radius: 8px 18px 18px 8px;
  box-shadow: 0 2px 6px rgba(31, 42, 68, 0.04), 0 8px 24px rgba(31, 42, 68, 0.07);
}
.msg.system .bubble {
  background: #eef0f4;
  color: var(--muted);
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 999px;
}

.msg .msg-img {
  max-width: 260px;
  max-height: 200px;
  border-radius: 8px;
  display: block;
  margin-bottom: 6px;
  border: 1px solid var(--border);
}

.msg-tools { margin-top: 6px; display: flex; gap: 8px; }
.msg-tools button {
  font-size: 12px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}
.msg-tools button:hover { border-color: var(--primary); color: var(--primary-dark); }

/* AI 消息下方的小字用量信息行（输入/缓存命中/输出/费用，随主题变量自动适配暗色） */
.msg-usage {
  margin-top: 5px;
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
  opacity: 0.85;
}

/* ============ AI 消息内容排版 ============ */
.bubble h1, .bubble h2, .bubble h3, .bubble h4 {
  margin: 14px 0 8px;
  line-height: 1.4;
  color: #16233f;
}
.bubble h1 { font-size: 19px; }
.bubble h2 { font-size: 17px; border-left: 4px solid var(--primary); padding-left: 10px; }
.bubble h3 { font-size: 15.5px; color: var(--primary-dark); }
.bubble h4 { font-size: 14.5px; }
.bubble h1:first-child, .bubble h2:first-child, .bubble h3:first-child { margin-top: 0; }

.bubble p { margin: 6px 0; }
.bubble ul, .bubble ol { margin: 6px 0 6px 22px; }
.bubble li { margin: 3px 0; }
.bubble strong { color: #101828; }
.bubble em { color: var(--muted); }

.bubble code {
  background: #f0f2f7;
  color: #c43b57;
  border-radius: 8px;
  padding: 1px 6px;
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 13px;
}
/* 代码块：气泡内不溢出（max-width 兜底 + 容器内横滚） */
.bubble pre {
  background: #161c2c;
  color: #d7e2f8;
  border-radius: 8px;
  padding: 12px 14px;
  margin: 10px 0;
  overflow-x: auto;
  max-width: 100%;
  font-family: "Cascadia Code", Consolas, "Courier New", monospace;
  font-size: 13px;
  line-height: 1.5;
}
.bubble pre code { background: transparent; color: inherit; padding: 0; }

.bubble blockquote {
  border-left: 3px solid var(--border);
  padding: 2px 12px;
  margin: 8px 0;
  color: var(--muted);
}

.bubble hr { border: none; border-top: 1px dashed var(--border); margin: 12px 0; }

.bubble table { border-collapse: collapse; margin: 10px 0; font-size: 13.5px; max-width: 100%; }
.bubble th, .bubble td { border: 1px solid var(--border); padding: 6px 10px; }
.bubble th { background: #f6f8fc; font-weight: 600; }

/* KaTeX 公式：长公式/显示公式气泡内横滚不溢出 */
.bubble .katex-display { margin: 10px 0; overflow-x: auto; overflow-y: hidden; max-width: 100%; }
.bubble .katex { font-size: 1.06em; }

/* 图像块（函数图/SVG示意图） */
.gk-block {
  margin: 12px 0;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfe;
  min-height: 60px;
}
[data-theme="dark"] .gk-block { background: #121826; }
.gk-block .js-plotly-plot { max-width: 100%; }

/* 打字占位动画 */
.typing-dots { display: inline-flex; gap: 4px; padding: 4px 0; }
.typing-dots i {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--muted);
  animation: blink 1.2s infinite;
}
.typing-dots i:nth-child(2) { animation-delay: 0.2s; }
.typing-dots i:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%, 70%, 100% { opacity: 0.25; } 35% { opacity: 1; } }

/* ============ 输入区（RikkaHub 悬浮输入条） ============ */
#composer {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 0 18px 18px;
  padding: 12px 14px 14px;
  box-shadow: var(--shadow-float);
  transition: border-color var(--t), box-shadow var(--t), background var(--t);
}
/* 聚焦时柔和光环（textarea 聚焦即触发，纯 CSS） */
#composer:focus-within {
  border-color: rgba(79, 110, 247, 0.5);
  box-shadow: 0 0 0 4px var(--focus-ring), var(--shadow-float);
}

#preview-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
#preview-row img {
  height: 74px;
  border-radius: 8px;
  border: 1px solid var(--border);
}
#preview-row .preview-name { font-size: 12px; color: var(--muted); max-width: 300px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#preview-row .preview-remove {
  border: none; background: none; font-size: 16px; color: var(--muted);
  cursor: pointer; padding: 2px 6px;
}
#preview-row .preview-remove:hover { color: var(--danger); }

#composer-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.icon-btn {
  width: 42px; height: 42px;
  font-size: 19px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fafbfe;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
  flex-shrink: 0;
}
/* 线CHATBARv2①：#btn-image 已移入「＋」聚合菜单（.plus-item），hover/active 统一由 #plus-menu .plus-item 接管 */
.icon-btn:active { transform: translateY(0) scale(0.96); }

#input {
  flex: 1;
  min-width: 0;
  resize: none;
  max-height: 160px;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 14.5px;
  line-height: 1.55;
  outline: none;
  background: #fafbfe;
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}
/* textarea 聚焦：浅光环即可（外圈由 #composer:focus-within 承担，避免双重光环） */
#input:focus {
  border-color: rgba(79, 110, 247, 0.6);
  background: #fff;
  box-shadow: 0 0 0 2px var(--focus-ring);
}

#btn-send {
  height: 42px;
  padding: 0 22px;
  border: none;
  border-radius: 8px;
  background: var(--send-grad);
  color: #fff;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--t-fast), box-shadow var(--t-fast), filter var(--t-fast);
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(79, 110, 247, 0.32);
}
#btn-send:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(79, 110, 247, 0.40);
}
#btn-send:active { transform: translateY(0) scale(0.96); box-shadow: 0 2px 8px rgba(79, 110, 247, 0.30); }
#btn-send:disabled { background: #a9b3cf; box-shadow: none; cursor: not-allowed; transform: none; }

/* ============ 「＋」聚合菜单（线CHATBARv2①：输入栏收敛，左清空仅留 ＋ / 右只留 📋+发送） ============ */
.plus-wrap { position: relative; flex-shrink: 0; }
#btn-plus { position: relative; }
#btn-plus.plus-open {
  border-color: rgba(79, 110, 247, 0.6);
  background: var(--primary-soft);
}
/* ＋ 角标：菜单内任一开关激活（深度思考/联网搜索/作文批改/换档）时显示主色小圆点 */
#btn-plus.plus-has-active::after {
  content: '';
  position: absolute;
  top: 5px;
  right: 5px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary, #4f6ef7);
  box-shadow: 0 0 0 1.5px var(--panel, #fff);
  pointer-events: none;
}
#plus-menu {
  position: absolute;
  bottom: calc(100% + 6px);
  left: 0;
  min-width: 184px;
  max-width: 240px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-float);
  padding: 6px;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
#plus-menu[hidden] { display: none; }
#plus-menu .plus-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-width: 0;
  padding: 9px 12px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: 14.5px;
  color: inherit;
  line-height: 1.4;
  transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
#plus-menu .plus-item:hover { background: var(--primary-soft); }
#plus-menu .plus-item:active { transform: translateY(0) scale(0.98); }
#plus-menu .plus-item .btn-icon { flex-shrink: 0; width: 22px; text-align: center; font-size: 17px; line-height: 1; }
#plus-menu .plus-item .btn-label { flex: 1; min-width: 0; display: inline; font-size: 14.5px; }
/* 菜单内激活态高亮（统一轻底+深字，覆盖各开关原 solid 样式——原样式为小图标钮设计，全宽行偏重） */
#plus-menu .plus-item.active,
#plus-menu .plus-item.think-active,
#plus-menu .plus-item.search-active,
#plus-menu .plus-item.essay-active {
  font-weight: 600;
  background: var(--primary-soft);
  color: var(--primary-dark, #3b4f9e);
  box-shadow: none;
}

/* ============ 思考强度滑杆（线CHATBARv2②：更快↔更智能 5 档 + 档位按钮 + 说明行） ============ */
#think-level-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  padding: 0 2px;
}
.think-level-label-left,
.think-level-label-right {
  font-size: 11.5px;
  color: var(--muted, #8a93a6);
  flex-shrink: 0;
  user-select: none;
  white-space: nowrap;
}
/* 滑杆本体（range input）：细轨 + 主色圆点 */
#think-slider {
  flex: 1;
  min-width: 0;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  border-radius: 8px;
  background: var(--border, #e2e5ed);
  outline: none;
  cursor: pointer;
}
#think-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary, #4f6ef7);
  border: 2px solid var(--panel, #fff);
  box-shadow: 0 1px 4px rgba(79, 110, 247, 0.35);
  cursor: grab;
  transition: transform 0.12s;
}
#think-slider::-webkit-slider-thumb:active { cursor: grabbing; transform: scale(1.12); }
#think-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary, #4f6ef7);
  border: 2px solid var(--panel, #fff);
  box-shadow: 0 1px 4px rgba(79, 110, 247, 0.35);
  cursor: grab;
}
#think-slider:focus-visible { box-shadow: 0 0 0 3px var(--focus-ring, rgba(79, 110, 247, 0.18)); }

/* 档位按钮：显示当前档位名，点击展开 5 档下拉 */
.think-level-tier-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
  padding: 5px 10px;
  border: 1px solid var(--border, #e2e5ed);
  border-radius: 999px;
  background: var(--panel, #fff);
  font-family: inherit;
  font-size: 12.5px;
  color: inherit;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast);
  position: relative;
}
.think-level-tier-btn .btn-icon { font-size: 14px; line-height: 1; }
.think-level-tier-btn:hover { background: var(--primary-soft, #eef1ff); border-color: rgba(79, 110, 247, 0.4); }
.think-level-tier-btn.plus-open { background: var(--primary-soft, #eef1ff); border-color: rgba(79, 110, 247, 0.6); }
/* 档 ≥3（开思考）时主色高亮 */
.think-level-tier-btn.is-thinking { color: var(--primary-dark, #3b4f9e); font-weight: 600; border-color: rgba(79, 110, 247, 0.5); }

/* 5 档下拉 */
.think-level-dropdown {
  position: absolute;
  bottom: calc(100% + 4px);
  right: 0;
  min-width: 200px;
  max-width: 250px;
  background: var(--panel, #fff);
  border: 1px solid var(--border, #e2e5ed);
  border-radius: 8px;
  box-shadow: var(--shadow-float, 0 8px 28px rgba(31, 36, 48, 0.16));
  padding: 5px;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.think-level-dropdown[hidden] { display: none; }
.think-level-opt {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  padding: 8px 11px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: inherit;
  transition: background var(--t-fast);
}
.think-level-opt .tlo-name { font-size: 13.5px; font-weight: 500; }
.think-level-opt .tlo-hint { font-size: 11.5px; color: var(--muted, #8a93a6); }
.think-level-opt:hover { background: var(--primary-soft, #eef1ff); }
.think-level-opt.is-active { background: var(--primary-soft, #eef1ff); font-weight: 600; }
.think-level-opt.is-active .tlo-name { color: var(--primary-dark, #3b4f9e); }

/* 档位说明行（灰字随档变） */
.think-level-desc {
  margin: 0 2px 8px;
  font-size: 12px;
  color: var(--muted, #8a93a6);
  line-height: 1.4;
  min-height: 16px;
}

/* 暗色主题适配 */
[data-theme="dark"] .think-level-tier-btn { background: var(--panel, #1f2430); }
[data-theme="dark"] .think-level-dropdown { background: var(--panel, #1f2430); }

/* ============ Toast ============ */
#toast {
  position: fixed;
  left: 50%;
  bottom: 96px;
  transform: translateX(-50%);
  max-width: min(520px, 88vw);
  padding: 11px 20px;
  border-radius: 8px;
  background: #1f2430;
  color: #fff;
  font-size: 13.5px;
  box-shadow: var(--shadow-md);
  z-index: 300;
  opacity: 0;
  transition: opacity 0.2s;
}
#toast.show { opacity: 1; }
#toast.error { background: #b4232a; }
#toast.success { background: #1d7a4e; }

/* ============ 弹窗 ============ */
#modal-root {
  position: fixed;
  inset: 0;
  background: rgba(15, 22, 40, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}
.modal {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  width: min(460px, 92vw);
  max-height: 82vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}
.modal h3 { font-size: 16px; margin-bottom: 14px; }

/* 通用表单组件（弹窗与页面内嵌面板共用） */
.field { margin-bottom: 12px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 5px; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  background: #fafbfe;
  color: var(--text);
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 16px; }

.btn {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #fff;
  font-size: 13.5px;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast),
              transform var(--t-fast), box-shadow var(--t-fast), filter var(--t-fast);
}
.btn:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.btn:active { transform: translateY(0) scale(0.98); }

.btn.primary {
  background: var(--send-grad);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 10px rgba(79, 110, 247, 0.26);
}
.btn.primary:hover {
  background: var(--send-grad);
  color: #fff;
  border-color: var(--primary-dark);
  filter: brightness(1.07);
  box-shadow: 0 4px 16px rgba(79, 110, 247, 0.34);
}
.btn.primary:active { box-shadow: 0 1px 4px rgba(79, 110, 247, 0.3); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; box-shadow: none; }

/* 错因/复习质量选项 */
.choice-row { display: flex; flex-wrap: wrap; gap: 8px; }
.choice-chip {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  transition: all var(--t-fast);
  background: #fff;
}
.choice-chip:hover { border-color: var(--primary); background: var(--primary-soft); }
.choice-chip.active { background: var(--primary-soft); border-color: var(--primary); color: var(--primary-dark); font-weight: 600; }

.answer-preview {
  background: #f8f9fc;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  max-height: 220px;
  overflow-y: auto;
  font-size: 13px;
  margin: 8px 0;
  white-space: pre-wrap;
}

/* ============ file:// 警告 ============ */
#file-protocol-warning {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}
.warn-box {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 40px;
  box-shadow: var(--shadow-lg);
  max-width: 520px;
  text-align: center;
  line-height: 1.9;
}
.warn-box h2 { color: var(--danger); margin-bottom: 12px; }

/* ============ 响应式 ============ */
@media (max-width: 860px) {
  #sidebar { width: 216px; min-width: 216px; }
  .msg { max-width: 90%; }
  .records-grid, .profile-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .tab-btn { padding: 8px 10px 9px; font-size: 13px; }
  #page-chat { flex-direction: column; }
  #sidebar {
    width: 100%; min-width: 0;
    flex-direction: row; flex-wrap: wrap;
    align-items: center;
    gap: 8px 12px;
    padding: 8px 12px;
    border-right: none;
    border-bottom: 1px solid var(--border);
    overflow: visible;
  }
  .brand { padding: 0; border: none; font-size: 15px; margin-right: auto; }
  .side-section { flex-direction: row; align-items: center; }
  .side-title { display: none; }
  #subject-select { width: auto; padding: 6px 8px; font-size: 13px; }
  .preset-list { flex-direction: row; }
  .preset-item { padding: 6px 10px; font-size: 12px; white-space: nowrap; }
  .review-list { display: none; }
  .side-footer { border: none; padding: 0; margin-left: auto; }
  .cost-badge { margin-top: 0; }
  #messages { padding: 16px 14px 22px; }
  #composer { margin: 0 10px 12px; padding: 10px 10px 12px; }
  #btn-send { padding: 0 18px; }
  /* 线MOBFIX P0：输入区两行布局——输入框独占第一行，6 按钮（48px 图标钮）第二行单排 */
  #composer-row { flex-wrap: wrap; }
  #input { flex: 1 1 100%; order: -1; min-width: 0; }
  #btn-draft, #btn-photograde { width: 48px; padding: 0; display: inline-flex; align-items: center; justify-content: center; }
  #btn-draft .btn-label, #btn-photograde .btn-label { display: none; }
  #btn-draft .btn-icon, #btn-photograde .btn-icon { margin-right: 0; }
  /* 线CHATBARv2②：滑杆在小屏收紧——档位按钮隐藏文字只留图标，下拉左对齐防溢出 */
  #think-level-bar { gap: 6px; }
  .think-level-label-left, .think-level-label-right { font-size: 10.5px; }
  .think-level-tier-btn { padding: 5px 8px; }
  .think-level-tier-btn .btn-label { display: none; }
  .think-level-dropdown { right: auto; left: 0; min-width: 180px; }
  /* 线MOBFIX P1：今日复习徽章（手机显示） */
  .review-badge {
    display: inline-flex; align-items: center; gap: 2px;
    padding: 5px 10px; border: 1px solid var(--primary); border-radius: 999px;
    background: var(--primary-soft); color: var(--primary-dark);
    font-size: 12px; font-weight: 600; cursor: pointer; white-space: nowrap;
  }
  .quiz-page-shell { margin: 8px auto; }
  .records-scroll, .page-scroll { padding: 14px 12px 24px; }
  .profile-grid, .records-grid { grid-template-columns: 1fr; }
}

/* ============ 空态 / 加载态柔化（线D2 2026-08-18） ============ */
/* 通用占位：柔和底色 + 虚线框，替代生硬灰字 */
#quiz-weak-summary > .muted,
#week-summary-body > .muted,
#probability-card-body > .muted,
#review-list > .muted,
#journal-list > .muted,
#mk-list > .muted,
.quiz-history > .muted,
.prob-history > .muted {
  background: var(--hover-bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 13px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}
/* 加载态专属：呼吸小圆点图标 */
#quiz-weak-summary > .muted::before,
#week-summary-body > .muted::before,
#probability-card-body > .muted::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--primary);
  vertical-align: 1px;
  animation: placeholderBlink 1.2s ease-in-out infinite;
}
@keyframes placeholderBlink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }
/* 周汇总空态 */
.week-empty {
  background: var(--hover-bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}
/* 资料库空态（<em>） */
#kb-doc-list em {
  display: block;
  text-align: center;
  background: var(--hover-bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  font-size: 13px;
  color: var(--muted);
  font-style: normal;
}

/* ============ 暗色护眼模式（跟随时间：19:00-7:00 自动） ============ */
[data-theme="dark"] {
  --bg: #0f131e;
  --panel: #171c2a;
  --primary: #5b78ff;
  --primary-dark: #7690ff;
  --primary-soft: #212a47;
  --text: #e6eaf2;
  --muted: #8b93a7;
  --border: #2a3145;
  --hover-bg: #1d2334;
  --ai-bubble: #1d2334;
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.30);
  --shadow-md: 0 3px 8px rgba(0, 0, 0, 0.35), 0 10px 28px rgba(0, 0, 0, 0.42);
  --shadow-lg: 0 6px 14px rgba(0, 0, 0, 0.40), 0 20px 48px rgba(0, 0, 0, 0.52);
  --shadow-float: 0 8px 20px rgba(0, 0, 0, 0.42), 0 24px 60px rgba(0, 0, 0, 0.55);
  --focus-ring: rgba(91, 120, 255, 0.24);
}

[data-theme="dark"] body { color: var(--text); }

/* 暗色滚动条 */
[data-theme="dark"] { scrollbar-color: rgba(139, 147, 167, 0.35) transparent; }
[data-theme="dark"] * { scrollbar-color: rgba(139, 147, 167, 0.35) transparent; }
[data-theme="dark"] *::-webkit-scrollbar-thumb { background-color: rgba(139, 147, 167, 0.3); }
[data-theme="dark"] *::-webkit-scrollbar-thumb:hover { background-color: rgba(139, 147, 167, 0.5); }
[data-theme="dark"] *::-webkit-scrollbar-thumb:active { background-color: rgba(139, 147, 167, 0.65); }

/* 暗色顶部导航毛玻璃 */
[data-theme="dark"] #tab-nav { background: rgba(23, 28, 42, 0.78); }

/* 暗色 AI 气泡阴影 */
[data-theme="dark"] .msg.ai .bubble { box-shadow: 0 2px 12px rgba(0, 0, 0, 0.28); }

/* 暗色主按钮与图标按钮 */
[data-theme="dark"] .btn.primary,
[data-theme="dark"] #btn-send {
  box-shadow: 0 2px 12px rgba(91, 120, 255, 0.3);
}
[data-theme="dark"] .btn.primary:hover,
[data-theme="dark"] #btn-send:hover { box-shadow: 0 4px 18px rgba(91, 120, 255, 0.38); }

/* 暗色空态/加载态占位 */
[data-theme="dark"] #quiz-weak-summary > .muted,
[data-theme="dark"] #week-summary-body > .muted,
[data-theme="dark"] #probability-card-body > .muted,
[data-theme="dark"] #review-list > .muted,
[data-theme="dark"] #journal-list > .muted,
[data-theme="dark"] #mk-list > .muted,
[data-theme="dark"] .quiz-history > .muted,
[data-theme="dark"] .prob-history > .muted,
[data-theme="dark"] .week-empty,
[data-theme="dark"] #kb-doc-list em {
  background: #121826;
  border-color: #2a3145;
}
[data-theme="dark"] .mk-item:hover { background: #232b45; }

[data-theme="dark"] #subject-select,
[data-theme="dark"] .preset-item,
[data-theme="dark"] .icon-btn,
[data-theme="dark"] #input,
[data-theme="dark"] .btn {
  background: #1d2334;
  color: var(--text);
  border-color: var(--border);
}

[data-theme="dark"] #input:focus { background: #232b45; }

[data-theme="dark"] .review-item { background: #232235; }

[data-theme="dark"] .msg.system .bubble { background: #232a3d; color: var(--muted); }

[data-theme="dark"] .bubble h1,
[data-theme="dark"] .bubble h2 { color: #f0f3fa; }

[data-theme="dark"] .bubble h3 { color: #9db1ff; }

[data-theme="dark"] .bubble strong { color: #ffffff; }

[data-theme="dark"] .bubble code {
  background: #2a3145;
  color: #ff9db0;
}

[data-theme="dark"] .bubble blockquote { color: var(--muted); }

[data-theme="dark"] .bubble th { background: #232a3d; }

[data-theme="dark"] .modal,
[data-theme="dark"] .warn-box { background: #171c2a; border-color: var(--border); }

[data-theme="dark"] .answer-preview { background: #1d2334; border-color: var(--border); }

[data-theme="dark"] .field input,
[data-theme="dark"] .field select,
[data-theme="dark"] .field textarea {
  background: #1d2334;
  color: var(--text);
  border-color: var(--border);
}
[data-theme="dark"] .field input:focus,
[data-theme="dark"] .field select:focus,
[data-theme="dark"] .field textarea:focus { background: #232b45; }

[data-theme="dark"] .choice-chip { background: #1d2334; color: var(--text); border-color: var(--border); }
[data-theme="dark"] .choice-chip.active { background: var(--primary-soft); border-color: var(--primary); color: #9db1ff; }

[data-theme="dark"] .msg-tools button { background: #1d2334; color: var(--muted); }
[data-theme="dark"] .msg-tools button:hover { border-color: var(--primary); color: #9db1ff; }

[data-theme="dark"] #file-protocol-warning { background: var(--bg); }

/* ============ 多页面布局（5 页标签导航） ============ */

/* 页面通用滚动容器 */
.page-scroll {
  flex: 1;
  overflow-y: auto;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 24px 32px;
}
.page-narrow { max-width: 640px; }

.page-title { font-size: 18px; font-weight: 700; margin-bottom: 14px; orphans: 2; widows: 2; word-break: break-word; overflow-wrap: anywhere; }
.card-title { font-size: 15px; font-weight: 700; margin-bottom: 12px; }
.card-title .muted { font-weight: 400; }

.panel-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 2px rgba(31, 42, 68, 0.02), 0 4px 18px rgba(31, 42, 68, 0.06);
}

.profile-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.profile-col { display: flex; flex-direction: column; }

/* 🎯 刷题中心页面外壳（原出题弹窗 → 页面内嵌）
   总管修复"滚不动"：flex 链上 .quiz-page-shell 缺 min-height:0 → #quiz-body 的 overflow-y:auto 永不生效、
   壳被内容撑破后被外层裁掉 → 补 min-height:0 让 #quiz-body 正常滚动到底 */
#page-quiz { justify-content: center; }
.quiz-page-shell {
  flex: 1;
  min-height: 0; /* 总管：flex 滚动链关键——无此行 #quiz-body 无法滚动（内容溢出被外层裁掉） */
  margin: 16px auto;
  max-width: 900px;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 6px rgba(31, 42, 68, 0.04), 0 12px 32px rgba(31, 42, 68, 0.08);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

.quiz-weak-summary {
  flex-shrink: 0;
  padding: 12px 22px 10px;
  border-bottom: 1px solid var(--border);
  background: #fbfcfe;
}
[data-theme="dark"] .quiz-weak-summary { background: #121826; }

.weak-summary-head { font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.weak-bars { display: flex; flex-direction: column; gap: 4px; }
.weak-row { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.weak-subject { width: 46px; font-weight: 600; flex-shrink: 0; }
.weak-bar {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.weak-bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), #8f7bf5); border-radius: 8px; }
.weak-count { width: 52px; text-align: right; color: var(--muted); flex-shrink: 0; }
.weak-chip { font-size: 12px; padding: 4px 12px; }

/* 📋 记录中心页面 */
#page-records { background: transparent; }
.records-scroll {
  flex: 1;
  overflow-y: auto;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 24px 32px;
}
.records-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-items: start;
}
.record-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  min-width: 0;
  box-shadow: 0 1px 2px rgba(31, 42, 68, 0.02), 0 4px 18px rgba(31, 42, 68, 0.06);
}
.record-card-wide { grid-column: 1 / -1; }

/* 今日计划 15 槽位表格（线B 渲染进 #pl-plan）：窄窗口内容超宽时容器内横滚，不撑破卡片 */
#pl-plan { overflow-x: auto; }

/* ============ 周度汇总自动化（线A2 2026-08-18，渲染进 #week-summary-body） ============ */
.week-summary { display: flex; flex-direction: column; gap: 10px; }
.week-xp-line { display: flex; align-items: baseline; gap: 6px; }
.week-xp-num { font-size: 32px; font-weight: 800; line-height: 1.1; color: var(--text); }
.week-xp-goal { font-size: 14px; color: var(--muted); }
.week-bar {
  height: 12px;
  border-radius: 8px;
  background: var(--primary-soft);
  overflow: hidden;
  border: 1px solid var(--border);
}
.week-bar-fill {
  height: 100%;
  border-radius: 8px;
  background: linear-gradient(90deg, #4f6ef7, #6a5cf0);
  transition: width 0.3s ease;
}
.week-bar-fill.week-ok { background: linear-gradient(90deg, #30a46c, #56c596); }
.week-bar-fill.week-warn { background: linear-gradient(90deg, #f59f00, #f7b733); }
.week-bar-fill.week-bad { background: linear-gradient(90deg, #e5484d, #ff6b6b); }
.week-meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 12.5px;
  color: var(--muted);
  flex-wrap: wrap;
}
.week-avg b { color: var(--text); font-weight: 700; }
.week-conclusion {
  padding: 7px 10px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.5;
}
.week-conclusion.week-ok { background: rgba(48, 164, 108, 0.13); color: #1f8a57; }
.week-conclusion.week-warn { background: rgba(245, 159, 0, 0.15); color: #a85e00; }
.week-conclusion.week-bad { background: rgba(229, 72, 77, 0.12); color: #c0392b; }
.week-chem { color: #d13a40; font-weight: 700; white-space: nowrap; }
.week-empty { font-size: 13px; line-height: 1.7; color: var(--muted); }
.week-empty p + p { margin-top: 4px; }
[data-theme="dark"] .week-conclusion.week-ok { background: rgba(48, 164, 108, 0.18); color: #5fd39a; }
[data-theme="dark"] .week-conclusion.week-warn { background: rgba(245, 159, 0, 0.18); color: #ffc964; }
[data-theme="dark"] .week-conclusion.week-bad { background: rgba(229, 72, 77, 0.18); color: #ff9d9d; }
[data-theme="dark"] .week-chem { color: #ff9d9d; }

.pl-date-row { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.pl-date-row input[type="date"] {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 13px;
  background: #fafbfe;
  color: var(--text);
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.pl-date-row input[type="date"]:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }
[data-theme="dark"] .pl-date-row input[type="date"] { background: #1d2334; color: var(--text); }

/* 原生控件跟随主色 */
input[type="checkbox"], input[type="radio"] { accent-color: var(--primary); }

/* ============ 规划师：印象笔记式五列表格复刻（线B 2026-08-18，验收基线 docs/计划表格复刻示例-v7.html） ============ */
.pl-sheet {
  width: 100%;
  background: #fff;
  border: 1px solid #666;
  border-radius: 8px;
  overflow: hidden;
  margin-top: 4px;
}
.pl-scroll { overflow-x: auto; }
.pl-titlebar {
  background: linear-gradient(90deg, #50b8c0, #98d890);
  padding: 12px 16px;
  text-align: center;
}
.pl-t1 { font-size: 16px; font-weight: 700; color: #fff; line-height: 1.5; }
.pl-t2, .pl-t3 { font-size: 12.5px; margin-top: 3px; color: #ffff00; line-height: 1.5; }
.pl-table { width: 100%; border-collapse: collapse; table-layout: fixed; min-width: 720px; }
.pl-table th {
  background: #50b8c0;
  border: 1px solid #444;
  padding: 6px 8px;
  font-size: 13.5px;
  font-weight: 700;
  text-align: center;
  color: #fff;
}
.pl-table td {
  border: 1px solid #444;
  padding: 7px 9px;
  vertical-align: top;
  font-size: 12px;
  line-height: 1.5;
  background: #e8e8e8;
}
.pl-c1 { width: 23%; } .pl-c2 { width: 17%; } .pl-c3 { width: 22%; } .pl-c4 { width: 21%; } .pl-c5 { width: 17%; }
.pl-task { margin-bottom: 7px; }
.pl-task:last-child { margin-bottom: 0; }
.pl-task.pl-done-task { opacity: .55; }
.pl-task.pl-done-task .pl-tname,
.pl-task.pl-done-task .pl-ttime { text-decoration: line-through; }
.pl-tname { font-weight: 700; font-size: 12.5px; }
.pl-tdur { font-weight: 600; }
.pl-ttime { color: #222; }
.pl-ctrl { margin-top: 3px; display: flex; align-items: center; gap: 6px; font-size: 11.5px; flex-wrap: wrap; }
.pl-score {
  width: 44px;
  padding: 2px 4px;
  border: 1px solid #999;
  border-radius: 8px;
  font-size: 12px;
  background: #fff;
  color: #111;
}
.pl-blue { color: #50b8c0; font-weight: 700; }
.pl-purple { color: #8a2be2; font-weight: 700; }
.pl-red { color: #e02020; font-weight: 700; }
.pl-mech { font-size: 11.5px; }
.pl-mech h4 { font-size: 12px; margin-bottom: 3px; color: #111; }
.pl-mech p { margin-bottom: 5px; color: #222; }
.pl-empty { color: #999; font-style: italic; }
.pl-total {
  border-top: 1px solid #444;
  padding: 8px 12px;
  background: #f0f0f0;
  font-size: 12.5px;
  font-weight: 600;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  align-items: center;
}
.pl-total .pl-total-note { font-weight: 400; color: #666; }
.pl-summary {
  border-top: 2px solid #444;
  font-size: 12.5px;
  line-height: 1.7;
  background: #ffffcc;
  padding: 10px 14px;
  color: #222;
}
.pl-summary .pl-s1 { font-weight: 700; color: #e02020; }

/* 暗色模式适配 */
[data-theme="dark"] .pl-sheet { background: #171c2a; border-color: #2a3145; }
[data-theme="dark"] .pl-table th { background: #2a7a83; border-color: #2a3145; }
[data-theme="dark"] .pl-table td { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .pl-ttime { color: #c9d1e3; }
[data-theme="dark"] .pl-mech h4 { color: #e6eaf2; }
[data-theme="dark"] .pl-mech p { color: #c9d1e3; }
[data-theme="dark"] .pl-score { background: #121826; color: #e6eaf2; border-color: #2a3145; }
[data-theme="dark"] .pl-total { background: #121826; border-color: #2a3145; }
[data-theme="dark"] .pl-total .pl-total-note { color: #8a93a6; }
[data-theme="dark"] .pl-summary { background: #26281a; color: #e6eaf2; }
[data-theme="dark"] .pl-empty { color: #6b7280; }
/* 暗色模式：三色标注提亮变体（蓝 #50b8c0→#5fd0da、紫 #8a2be2→#b78df0、红 #e02020→#ff6b6b），保证深色单元格上可读 */
[data-theme="dark"] .pl-blue { color: #5fd0da; }
[data-theme="dark"] .pl-purple { color: #b78df0; }
[data-theme="dark"] .pl-red { color: #ff6b6b; }
[data-theme="dark"] .pl-summary .pl-s1 { color: #ff6b6b; }

/* 错题本内嵌表单 + 统计 + 列表 */
.mk-form {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px 4px;
  background: #fafbfe;
  margin-bottom: 14px;
}
[data-theme="dark"] .mk-form { background: #1d2334; }

.mk-stats { margin: 12px 0; display: flex; flex-wrap: wrap; gap: 14px; }
.mk-stats .mk-stat-box { font-size: 12px; color: var(--muted); }
.mk-stats .mk-stat-box strong { color: var(--text); }

.mk-list { display: flex; flex-direction: column; gap: 6px; }
.mk-item {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  background: #fafbfe;
  font-size: 13px;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.mk-item:hover { border-color: var(--primary); background: var(--hover-bg); }
[data-theme="dark"] .mk-item { background: #1d2334; }
.mk-item .mk-q { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--muted); }
.mk-item .btn { flex-shrink: 0; padding: 4px 12px; font-size: 12.5px; }

/* ============ 线G1：错题自动化（自动收题开关 / 打包复习 / 变式按钮，不改既有 .mk-*） ============ */
.mk-auto-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin: 8px 0 4px;
  padding: 8px 12px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: #fbfcfe;
}
.mk-auto-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}
.mk-auto-toggle input[type="checkbox"] {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}
.mk-auto-pack { font-size: 12.5px; padding: 5px 12px; flex-shrink: 0; }
.mk-auto-kp { font-size: 12.5px; padding: 5px 12px; flex-shrink: 0; white-space: nowrap; }
[data-theme="dark"] .mk-auto-bar { background: #171c2a; }
[data-theme="dark"] .mk-auto-toggle { color: var(--text); }

/* 变式按钮在既有 .mk-item 行内的紧凑样式（不改 .mk-item 本体） */
.mk-item [data-var],
.mk-item [data-var2] {
  flex-shrink: 0;
  padding: 4px 10px;
  font-size: 12.5px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border-color: var(--primary);
}
.mk-item [data-var]:hover,
.mk-item [data-var2]:hover {
  background: var(--primary);
  color: #fff;
}

/* 记录中心/资料库/档案 各页面卡片内的标题行 */
.records-grid .modal-actions,
.panel-card .modal-actions { flex-wrap: wrap; }

/* ============ AI 出题引擎 ============ */
.quiz-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.quiz-head-left { display: flex; flex-direction: column; gap: 2px; }
.quiz-head h3 { margin: 0; }
.quiz-head-meta { font-size: 12px; }
.quiz-head-right { display: flex; align-items: center; gap: 12px; }

/* 模拟卷计时器条 */
.quiz-timer {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid var(--primary);
  border-radius: 999px;
  padding: 5px 14px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

#quiz-body { flex: 1; overflow-y: auto; padding: 18px 22px 26px; }

/* 模式选择页卡片 */
.quiz-mode-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.quiz-mode-card {
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fafbfe;
  cursor: pointer;
  transition: all 0.18s;
  font-size: 14px;
  box-shadow: var(--shadow-sm);
  min-width: 0;
}
.quiz-mode-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.quiz-mode-icon {
  width: 46px; height: 46px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #8f7bf5);
  color: #fff;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}
.quiz-mode-name { font-weight: 700; font-size: 15px; }
.quiz-mode-desc { font-size: 12.5px; color: var(--muted); margin-top: 3px; line-height: 1.55; }
.quiz-mode-arrow { margin-left: auto; color: var(--muted); font-size: 16px; flex-shrink: 0; }

.quiz-stat { margin-top: 16px; text-align: center; }
.quiz-history { margin-top: 18px; display: flex; flex-direction: column; gap: 6px; }
.quiz-hist-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fafbfe;
  font-size: 13px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
}
.quiz-hist-item:hover { border-color: var(--primary); background: var(--primary-soft); }
.quiz-hist-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.quiz-status {
  margin: 40px auto;
  width: fit-content;
  max-width: 90%;
  text-align: center;
  padding: 16px 28px;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  animation: quizPulse 1.8s ease-in-out infinite;
}
@keyframes quizPulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.72; } }

/* 线F006 P1-1：兜底纯文本展示（解析失败时原始内容 pre） */
.raw-fallback {
  max-height: 300px; overflow: auto;
  white-space: pre-wrap; word-break: break-word;
  background: #f6f7f9; padding: 10px;
  border-radius: 8px; margin: 8px 0;
  font-size: 13px; line-height: 1.6;
}
[data-theme="dark"] .raw-fallback { background: #1e1e2a; color: #cdd6f4; }

/* 题目卡片（考卷式） */
.quiz-q {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: 14px;
  background: #fdfdff;
  box-shadow: 0 1px 2px rgba(31, 42, 68, 0.02), 0 4px 18px rgba(31, 42, 68, 0.06);
}
.quiz-q-head {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border);
}
/* 题号徽章 */
.quiz-q-no {
  font-size: 13px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #6a5cf0);
  border-radius: 8px;
  padding: 3px 11px;
  white-space: nowrap;
}
/* 题型徽章 */
.quiz-type {
  font-size: 11.5px;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px 8px;
  font-weight: 700;
  white-space: nowrap;
}
/* 考点标签 */
.quiz-point {
  font-size: 12px;
  color: var(--muted);
  background: #f2f4f9;
  border-radius: 8px;
  padding: 2px 8px;
  max-width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
/* 分值标注 */
.quiz-score-badge {
  font-size: 12px;
  font-weight: 700;
  color: #b45309;
  background: #fef3e2;
  border: 1px solid #f5d9a8;
  border-radius: 8px;
  padding: 2px 8px;
  white-space: nowrap;
}
/* 对错标记 */
.quiz-mark {
  font-size: 12.5px;
  font-weight: 800;
  padding: 2px 9px;
  border-radius: 8px;
  white-space: nowrap;
}
.quiz-mark.ok { color: #1d7a4e; background: #e9f7ef; }
.quiz-mark.bad { color: #b4232a; background: #fdecec; }
/* 题号进度 N/M */
.quiz-progress {
  margin-left: auto;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* 题干：大字 + 舒适行距 */
.quiz-q-text {
  margin: 6px 0 12px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  overflow-wrap: break-word;
}
.quiz-q-text p { margin: 6px 0; }
.quiz-q-text .katex { font-size: 1.05em; }

.quiz-section-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--primary-dark);
  border-left: 4px solid var(--primary);
  padding-left: 10px;
  margin: 18px 0 12px;
}

/* 选项：纵向整行大按钮 */
.quiz-options { display: flex; flex-direction: column; gap: 10px; margin: 12px 0 4px; }
.quiz-options-tip { font-size: 12px; color: var(--muted); margin-bottom: 2px; }
.quiz-opt {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: all 0.15s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--primary); background: var(--primary-soft); }
.quiz-opt.active {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 2px var(--primary-soft);
}
.quiz-opt:focus-visible { outline: 2px solid rgba(79, 110, 247, 0.55); outline-offset: 2px; }
.quiz-opt:disabled { cursor: default; }
.quiz-opt .quiz-opt-letter {
  flex-shrink: 0;
  width: 30px; height: 30px;
  margin-top: 3px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: #fff;
  color: var(--text);
  font-weight: 800;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.quiz-opt:hover:not(:disabled) .quiz-opt-letter { border-color: var(--primary); color: var(--primary-dark); }
.quiz-opt.active .quiz-opt-letter { background: var(--primary); border-color: var(--primary); color: #fff; }
.quiz-opt-text { flex: 1; min-width: 0; overflow-wrap: break-word; }
.quiz-opt-text .katex { font-size: 1em; }

/* 客观题判后标注：正确项绿 / 错选红 */
.quiz-opt.correct { border-color: #2fa06f; background: #e9f7ef; }
.quiz-opt.correct .quiz-opt-letter { background: #30a46c; border-color: #30a46c; color: #fff; }
.quiz-opt.wrong { border-color: #e5484d; background: #fdecec; }
.quiz-opt.wrong .quiz-opt-letter { background: #e5484d; border-color: #e5484d; color: #fff; }

/* 主观题作答输入框 */
.quiz-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 14.5px;
  resize: vertical;
  min-height: 72px;
  outline: none;
  margin-top: 8px;
  line-height: 1.7;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.quiz-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }

.quiz-hint { margin: 8px 0; }
.quiz-hint summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
  user-select: none;
}
.quiz-hint-body {
  background: #f8f9fc;
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.7;
}

/* 统一反馈卡：判定 + 我的/标准答案 + 解析 + 批改 + 得分 */
.quiz-feedback {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-top: 14px;
  background: #fbfcfe;
}
.quiz-fb-verdict {
  border-radius: 8px;
  padding: 10px 14px;
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 12px;
}
.quiz-fb-verdict.ok { background: #e9f7ef; color: #1d7a4e; }
.quiz-fb-verdict.bad { background: #fdecec; color: #b4232a; }
.quiz-fb-verdict.unk { background: #eef1fe; color: var(--primary-dark); }
.quiz-fb-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.quiz-fb-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  background: #fff;
  font-size: 14px;
  line-height: 1.75;
  margin-top: 10px;
}
.quiz-fb-grid .quiz-fb-item { margin-top: 0; }
.quiz-fb-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  margin-bottom: 4px;
  letter-spacing: 0.3px;
}
.quiz-fb-mine { border-left: 3px solid var(--muted); }
.quiz-fb-std { border-left: 3px solid var(--success); background: #eefaf3; }
.quiz-fb-exp { border-left: 3px solid var(--primary); }
.quiz-fb-fb { border-left: 3px solid #8f7bf5; }
.quiz-fb-body p { margin: 3px 0; }
.quiz-fb-score {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  color: var(--primary-dark);
  background: var(--primary-soft);
  border-radius: 8px;
  padding: 4px 12px;
  margin-top: 12px;
}

/* 操作条：醒目 + 固定底部 */
.quiz-action-bar {
  position: sticky;
  bottom: 0;
  z-index: 5;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  padding: 14px 2px 2px;
  background: linear-gradient(to top, var(--panel) 55%, rgba(255, 255, 255, 0));
}
.quiz-action-bar .btn {
  padding: 10px 22px;
  font-size: 14px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.quiz-action-bar .btn.primary {
  background: var(--send-grad);
  border-color: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 14.5px;
  padding: 11px 26px;
  box-shadow: 0 2px 10px rgba(79, 110, 247, 0.28);
}
.quiz-action-bar .btn.primary:hover {
  background: var(--send-grad);
  filter: brightness(1.07);
  box-shadow: 0 4px 16px rgba(79, 110, 247, 0.36);
}

.quiz-score {
  text-align: center;
  font-size: 20px;
  font-weight: 700;
  padding: 14px;
  border-radius: 8px;
  background: #f4f6fb;
  border: 1px solid var(--border);
  margin-bottom: 12px;
}
.quiz-score.ok { color: #1d7a4e; background: #e9f7ef; }

.quiz-wrong-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  margin-top: 8px;
}

/* 暗色适配 */
[data-theme="dark"] .quiz-timer { background: #212a47; border-color: var(--primary); color: #9db1ff; }
[data-theme="dark"] .quiz-mode-card,
[data-theme="dark"] .quiz-hist-item { background: #1d2334; color: var(--text); }
[data-theme="dark"] .quiz-mode-desc { color: var(--muted); }
[data-theme="dark"] .quiz-q { background: #1d2334; }
[data-theme="dark"] .quiz-q-text { color: var(--text); }
[data-theme="dark"] .quiz-point { background: #232a3d; color: #9aa4bd; }
[data-theme="dark"] .quiz-score-badge { background: #3a2f1c; border-color: #5c4a26; color: #ffd27d; }
[data-theme="dark"] .quiz-score { background: #1d2334; color: var(--text); }
[data-theme="dark"] .quiz-score.ok { background: #16352a; color: #5fd39a; }
[data-theme="dark"] .quiz-mark.ok { background: #16352a; color: #5fd39a; }
[data-theme="dark"] .quiz-mark.bad { background: #3c2124; color: #ff9d9d; }
[data-theme="dark"] .quiz-opt { background: #1d2334; color: var(--text); border-color: var(--border); }
[data-theme="dark"] .quiz-opt .quiz-opt-letter { background: #232a3d; color: var(--text); border-color: var(--border); }
[data-theme="dark"] .quiz-opt:hover:not(:disabled) { background: #232b45; border-color: var(--primary); }
[data-theme="dark"] .quiz-opt.active { background: #212a47; border-color: var(--primary); box-shadow: 0 0 0 2px #212a47; }
[data-theme="dark"] .quiz-opt.active .quiz-opt-letter { background: var(--primary); border-color: var(--primary); color: #fff; }
[data-theme="dark"] .quiz-opt.correct { background: #16352a; border-color: #2fa06f; }
[data-theme="dark"] .quiz-opt.correct .quiz-opt-letter { background: #30a46c; border-color: #30a46c; color: #fff; }
[data-theme="dark"] .quiz-opt.wrong { background: #3c2124; border-color: #e5484d; }
[data-theme="dark"] .quiz-opt.wrong .quiz-opt-letter { background: #e5484d; border-color: #e5484d; color: #fff; }
[data-theme="dark"] .quiz-feedback { background: #1d2334; }
[data-theme="dark"] .quiz-fb-item { background: #171c2a; border-color: var(--border); }
[data-theme="dark"] .quiz-fb-std { background: #1d2a33; }
[data-theme="dark"] .quiz-fb-verdict.ok { background: #16352a; color: #5fd39a; }
[data-theme="dark"] .quiz-fb-verdict.bad { background: #3c2124; color: #ff9d9d; }
[data-theme="dark"] .quiz-fb-verdict.unk { background: #212a47; color: #9db1ff; }
[data-theme="dark"] .quiz-input {
  background: #1d2334;
  color: var(--text);
  border-color: var(--border);
}
[data-theme="dark"] .quiz-hint-body { background: #1d2334; }

@media (max-width: 640px) {
  .quiz-mode-grid { grid-template-columns: 1fr; }
  .quiz-fb-grid { grid-template-columns: 1fr; }
  .quiz-q { padding: 14px 14px; }
  #quiz-body { padding: 14px 14px 20px; }
  .quiz-opt { padding: 11px 12px; font-size: 14.5px; }
  .quiz-action-bar { flex-wrap: wrap; }
  .quiz-action-bar .btn { flex: 1 1 45%; }
  .quiz-head { padding: 12px 14px; }
  .quiz-resume { margin: 10px 14px 0; }
}

/* ============ 线F1：断点续做提示条 / 快练倒计时 / 历史状态徽标 / 孤儿清理 ============ */
.quiz-resume {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin: 12px 22px 0;
  padding: 10px 14px;
  border: 1px solid var(--primary);
  background: var(--primary-soft);
  border-radius: 8px;
  font-size: 13.5px;
  color: var(--primary-dark);
  box-shadow: var(--shadow-sm);
}
.quiz-resume-text { display: flex; align-items: center; gap: 6px; font-weight: 600; min-width: 0; }
.quiz-resume-actions { display: flex; gap: 8px; flex-shrink: 0; }
.quiz-resume-actions .btn { padding: 5px 14px; font-size: 12.5px; }

/* 单题快练倒计时（题目卡头部） */
.quiz-time-left {
  font-size: 12.5px;
  font-weight: 800;
  color: #b45309;
  background: #fef3e2;
  border: 1px solid #f5d9a8;
  border-radius: 8px;
  padding: 2px 9px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.quiz-time-left.timeout { color: #b4232a; background: #fdecec; border-color: #f5c2c2; }

/* 练习历史：未完成/已放弃灰显 + 超时徽标 + 清理按钮 */
.quiz-history-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.quiz-cleanup-btn { font-size: 12px; padding: 5px 10px; flex-shrink: 0; }
.quiz-hist-item-abandoned { opacity: 0.72; }
.quiz-hist-status {
  font-size: 12px;
  font-weight: 700;
  border-radius: 8px;
  padding: 2px 8px;
  white-space: nowrap;
}
.quiz-hist-status.abandoned { color: var(--muted); background: #eef0f4; border: 1px solid var(--border); }
.quiz-hist-status.timeout { color: #b45309; background: #fef3e2; border: 1px solid #f5d9a8; }

/* 小结页超时标注 */
.quiz-score.timeout { color: #b45309; background: #fef3e2; border-color: #f5d9a8; }

[data-theme="dark"] .quiz-resume { background: #212a47; color: #9db1ff; }
[data-theme="dark"] .quiz-time-left { color: #ffb054; background: #3a2e14; border-color: #7a5b1e; }
[data-theme="dark"] .quiz-time-left.timeout { color: #ff9d9d; background: #3c2124; border-color: #8a3a3a; }
[data-theme="dark"] .quiz-hist-status.abandoned { color: #9aa3b8; background: #1d2334; border-color: var(--border); }
[data-theme="dark"] .quiz-hist-status.timeout { color: #ffb054; background: #3a2e14; border-color: #7a5b1e; }
[data-theme="dark"] .quiz-score.timeout { color: #ffb054; background: #3a2e14; }

#btn-theme {
  border: 1px solid var(--border);
  background: transparent;
  border-radius: var(--radius-sm);
  width: 34px;
  height: 34px;
  font-size: 16px;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
  flex-shrink: 0;
}
#btn-theme:hover { border-color: var(--primary); background: var(--primary-soft); }
#btn-theme:active { transform: scale(0.94); }

#chat-header .header-right { display: flex; align-items: center; gap: 12px; position: relative; z-index: 101; } /* k3 热修（基线 v5.6.3，v5.6.4 吸收后作废）：防 #right-sidebar 遮挡主题/设置按钮 */

/* ============ 概率微调链（线B3 2026-08-18，渲染进 #probability-card-body） ============ */
.prob-anchor-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.prob-anchor-num { font-size: 46px; font-weight: 800; line-height: 1.05; }
.prob-anchor-label { font-size: 12.5px; color: var(--muted); margin-top: 2px; }
/* 锚点大字区间配色：<10 红 / 10-25 橙 / 25-50 黄 / 50-75 青 / >75 绿 */
.prob-red { color: #e5484d; }
.prob-orange { color: #f0870a; }
.prob-yellow { color: #d99a06; }
.prob-cyan { color: #0fa3b1; }
.prob-green { color: #2f9e63; }
[data-theme="dark"] .prob-red { color: #ff6b6b; }
[data-theme="dark"] .prob-orange { color: #ffb054; }
[data-theme="dark"] .prob-yellow { color: #ffd166; }
[data-theme="dark"] .prob-cyan { color: #4dd7e0; }
[data-theme="dark"] .prob-green { color: #56d68f; }

.prob-form { margin: 10px 0 4px; }
.prob-form-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.prob-form-row select,
.prob-form-row input[type="text"] {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 13px;
  background: #fafbfe;
  color: var(--text);
  outline: none;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.prob-form-row select:focus,
.prob-form-row input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.prob-form-row select { flex: 0 0 auto; }
.prob-form-row input[type="text"] { flex: 1 1 220px; min-width: 0; }
[data-theme="dark"] .prob-form-row select,
[data-theme="dark"] .prob-form-row input[type="text"] { background: #1d2334; color: var(--text); }
.prob-warn {
  margin-top: 8px;
  padding: 7px 10px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  color: #b4232a;
  background: rgba(229, 72, 77, 0.12);
}
[data-theme="dark"] .prob-warn { color: #ff9d9d; background: rgba(229, 72, 77, 0.18); }
.prob-rules { margin-top: 8px; font-size: 12px; line-height: 1.6; }

/* 线EXAMREVIEW：节点考试复盘卡 */
.exr-form { margin-bottom: 12px; }
.exr-form-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
.exr-form-row label { font-size: 13px; min-width: 70px; }
.exr-score-table { width: 100%; max-width: 400px; margin: 8px 0; border-collapse: collapse; }
.exr-score-table td { padding: 4px 8px; border: 1px solid var(--border); }
.exr-score-table td:first-child { width: 80px; }
.exr-records { margin-top: 12px; display: flex; flex-direction: column; gap: 10px; }
.exr-record { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; }
.exr-record-head { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.exr-subjects { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.exr-thresholds { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 6px; }
.exr-pass { font-size: 11px; padding: 2px 6px; border-radius: 8px; background: rgba(48, 164, 108, 0.12); color: #1f8a57; }
.exr-fail { font-size: 11px; padding: 2px 6px; border-radius: 8px; background: rgba(229, 72, 77, 0.12); color: #c0392b; }
[data-theme="dark"] .exr-pass { background: rgba(48, 164, 108, 0.18); color: #5fd39a; }
[data-theme="dark"] .exr-fail { background: rgba(229, 72, 77, 0.18); color: #ff9d9d; }

.prob-copy {
  margin-top: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(80, 184, 192, 0.08);
}
.prob-copy-title { font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.prob-copy textarea {
  width: 100%;
  box-sizing: border-box;
  min-height: 54px;
  resize: vertical;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 12.5px;
  line-height: 1.6;
  background: #fafbfe;
  color: var(--text);
}
[data-theme="dark"] .prob-copy textarea { background: #1d2334; color: var(--text); }

.prob-history { margin-top: 14px; }
.prob-history-title { font-size: 14px; font-weight: 700; margin-bottom: 8px; }
.prob-table-wrap { overflow-x: auto; }
.prob-table { width: 100%; border-collapse: collapse; font-size: 12.5px; min-width: 520px; }
.prob-table th,
.prob-table td {
  border: 1px solid var(--border);
  padding: 6px 8px;
  text-align: left;
  vertical-align: top;
}
.prob-table th { background: var(--primary-soft); font-weight: 700; white-space: nowrap; }
.prob-table td { color: var(--text); }
.prob-delta { white-space: nowrap; font-weight: 600; }
.prob-up { color: #2f9e63; }
.prob-down { color: #e5484d; }
[data-theme="dark"] .prob-up { color: #56d68f; }
[data-theme="dark"] .prob-down { color: #ff6b6b; }
.prob-cause { color: var(--muted); }
.prob-flag { color: #e5484d; font-weight: 700; }

/* ============ 地球OL 联动档1：生成同步摘要（线A4 2026-08-18，渲染进 #sync-summary-body） ============ */
.sync-result { margin-top: 10px; }
.sync-meta { margin-bottom: 8px; font-size: 12px; line-height: 1.6; }
.sync-result textarea {
  width: 100%;
  box-sizing: border-box;
  min-height: 150px;
  resize: vertical;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  line-height: 1.7;
  background: #fafbfe;
  color: var(--text);
  outline: none;
}
.sync-result textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }
[data-theme="dark"] .sync-result textarea { background: #1d2334; color: var(--text); }
.sync-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.sync-hint {
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: #a85e00;
  background: rgba(245, 159, 0, 0.14);
}
[data-theme="dark"] .sync-hint { color: #ffc964; background: rgba(245, 159, 0, 0.16); }

/* ==========================================================
   响应式兜底（线D2 2026-08-18）：
   文件中部 @media(max-width:860px/640px) 早于 .records-grid/.profile-grid
   基类定义，同级规则"后写胜出"导致窄屏仍双列——概率锚点卡被压到 ~168px、
   46px 大数字被裁切。在文件末尾重声明，确保窄屏真正收为单列。
   ========================================================== */
@media (max-width: 860px) {
  .records-grid, .profile-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .records-grid, .profile-grid { grid-template-columns: 1fr; }
  /* 讲解模式 5 个预设按钮窄屏换行，避免 400px 下横向溢出；
     覆盖桌面端 width:100% 竖排样式，恢复小胶囊横排 */
  .side-section { flex-wrap: wrap; }
  .preset-list { flex-wrap: wrap; }
  .preset-item { width: auto; }
}

/* ==========================================================
   线D4 RikkaHub 风格化（2026-08-18）
   聊天气泡错落 / 悬浮输入条 / 空态插画感 / 暗色精修
   ========================================================== */

/* ---------- 空态插画感：柔底渐变光斑 + 居中大字感（纯 CSS，不依赖 JS 改文案） ---------- */
#quiz-weak-summary > .muted,
#week-summary-body > .muted,
#probability-card-body > .muted,
#review-list > .muted,
#journal-list > .muted,
#mk-list > .muted,
.quiz-history > .muted,
.prob-history > .muted,
.week-empty,
#kb-doc-list em {
  position: relative;
  overflow: hidden;
  display: block;  /* 线F016#1：确保空态 block 占位不浮层 */
  clear: both;     /* 线F016#1：清除浮动避免压住下方表单 */
  text-align: center;
  background:
    radial-gradient(140px 90px at 88% 12%, rgba(79, 110, 247, 0.10), transparent 70%),
    radial-gradient(120px 80px at 8% 96%, rgba(143, 123, 245, 0.09), transparent 70%),
    var(--hover-bg);
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  font-size: 14px;
  line-height: 1.8;
}
/* 右下角柔和装饰光斑（插画感点缀，与加载态呼吸圆点 ::before 互不冲突） */
#quiz-weak-summary > .muted::after,
#week-summary-body > .muted::after,
#probability-card-body > .muted::after,
#review-list > .muted::after,
#journal-list > .muted::after,
#mk-list > .muted::after,
.quiz-history > .muted::after,
.prob-history > .muted::after,
.week-empty::after,
#kb-doc-list em::after {
  content: '';
  position: absolute;
  right: -22px;
  bottom: -30px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79, 110, 247, 0.10), transparent 65%);
  pointer-events: none;
}

/* ---------- 用户气泡内容配色：渐变底上的文字/代码/标题全部提亮 ---------- */
.msg.user .bubble strong { color: #fff; }
.msg.user .bubble em { color: rgba(255, 255, 255, 0.85); }
.msg.user .bubble h1,
.msg.user .bubble h2,
.msg.user .bubble h3,
.msg.user .bubble h4 { color: #fff; }
.msg.user .bubble code {
  background: rgba(255, 255, 255, 0.20);
  color: #fff;
}
.msg.user .bubble blockquote { color: rgba(255, 255, 255, 0.9); }
.msg.user .bubble th { background: rgba(255, 255, 255, 0.14); color: #fff; }
.msg.user .bubble td { border-color: rgba(255, 255, 255, 0.35); }
.msg.user .bubble hr { border-top-color: rgba(255, 255, 255, 0.35); }

/* ---------- 暗色精修：悬浮输入条 / 导航光带 / 气泡 / 空态 ---------- */
[data-theme="dark"] #tab-nav {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.01) 70%, rgba(255, 255, 255, 0) 100%),
    rgba(23, 28, 42, 0.78);
}
[data-theme="dark"] #tab-nav::before {
  background: linear-gradient(90deg, transparent, rgba(91, 120, 255, 0.70), rgba(143, 123, 245, 0.70), transparent);
  box-shadow: 0 0 14px rgba(91, 120, 255, 0.30);
}

[data-theme="dark"] #composer {
  background: linear-gradient(180deg, #1c2336, #171c2a);
  border-color: #2a3145;
}
[data-theme="dark"] #composer:focus-within { border-color: rgba(91, 120, 255, 0.55); }

[data-theme="dark"] .msg.user .bubble { box-shadow: 0 4px 16px rgba(79, 110, 247, 0.35); }
/* AI 气泡暗色：柔卡片 + 顶部 1px 高光线（inset 不占布局） */
[data-theme="dark"] .msg.ai .bubble {
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 2px 6px rgba(0, 0, 0, 0.30), 0 10px 26px rgba(0, 0, 0, 0.35);
}

[data-theme="dark"] #quiz-weak-summary > .muted,
[data-theme="dark"] #week-summary-body > .muted,
[data-theme="dark"] #probability-card-body > .muted,
[data-theme="dark"] #review-list > .muted,
[data-theme="dark"] #journal-list > .muted,
[data-theme="dark"] #mk-list > .muted,
[data-theme="dark"] .quiz-history > .muted,
[data-theme="dark"] .prob-history > .muted,
[data-theme="dark"] .week-empty,
[data-theme="dark"] #kb-doc-list em {
  background:
    radial-gradient(140px 90px at 88% 12%, rgba(91, 120, 255, 0.13), transparent 70%),
    radial-gradient(120px 80px at 8% 96%, rgba(143, 123, 245, 0.11), transparent 70%),
    #121826;
  border-color: #2a3145;
}
[data-theme="dark"] #quiz-weak-summary > .muted::after,
[data-theme="dark"] #week-summary-body > .muted::after,
[data-theme="dark"] #probability-card-body > .muted::after,
[data-theme="dark"] #review-list > .muted::after,
[data-theme="dark"] #journal-list > .muted::after,
[data-theme="dark"] #mk-list > .muted::after,
[data-theme="dark"] .quiz-history > .muted::after,
[data-theme="dark"] .prob-history > .muted::after,
[data-theme="dark"] .week-empty::after,
[data-theme="dark"] #kb-doc-list em::after {
  background: radial-gradient(circle, rgba(91, 120, 255, 0.12), transparent 65%);
}

/* ============ 对话线程（线B5 · 第三批·批次1 线程底座） ============ */
.thread-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  min-width: 0;          /* 总管：防标签栏把页面撑宽 */
  overflow-x: auto;      /* 标签过多时本栏自滚，不撑出页面横向滚动条 */
  padding: 10px 18px 0;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.thread-tab {
  border: 1px solid var(--border);
  background: #fafbfe;
  color: var(--muted);
  font-size: 12.5px;
  padding: 5px 12px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--t-fast, 0.15s);
}
.thread-tab:hover { border-color: var(--primary); color: var(--primary-dark); background: #fff; }
.thread-tab.active {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary-dark);
  font-weight: 600;
}
.thread-tab.topic { border-style: solid; }
.thread-tab.topic.active::before { content: '📌 '; }

.thread-tab-add {
  border-style: dashed;
  background: transparent;
}
.thread-tab-add:hover { background: var(--primary-soft); }

.thread-tab-arch { margin-left: auto; background: transparent; }
.thread-tab-arch.has-items { border-color: #e0b36a; color: #b26a00; background: #fdf6e8; }

/* ➕新专题内嵌表单 */
.thread-new-form {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.thread-new-form select,
.thread-new-form input {
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  background: #fafbfe;
  color: var(--text);
  outline: none;
}
.thread-new-form input { flex: 1; min-width: 180px; }
.thread-new-form select:focus,
.thread-new-form input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }

/* 📦归档列表 */
.thread-arch-list {
  padding: 10px 18px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.thread-arch-head { font-size: 12px; font-weight: 600; color: var(--muted); }
.thread-arch-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  padding: 6px 0;
}

[data-theme="dark"] .thread-tab { background: #1d2334; color: var(--muted); border-color: var(--border); }
[data-theme="dark"] .thread-tab:hover { background: #232b45; color: #9db1ff; border-color: var(--primary); }
[data-theme="dark"] .thread-tab.active { background: var(--primary-soft); border-color: var(--primary); color: #9db1ff; }
[data-theme="dark"] .thread-tab-arch.has-items { background: #3a2f1d; border-color: #8a6a2f; color: #e0b36a; }
[data-theme="dark"] .thread-new-form select,
[data-theme="dark"] .thread-new-form input { background: #1d2334; color: var(--text); border-color: var(--border); }

/* ============ 主动干预 + 学习流自动驾驶（线E+F′ · P0） ============ */
.autopilot-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 18px 10px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
/* 线F007 P1：[hidden] 时真正隐藏——.autopilot-bar{display:flex} 优先级高于 UA [hidden]，
   导致关闭自动驾驶后本栏仍占 ~40px 中部空白带（答疑页讲解模式按钮与学科头之间）。显式声明收起。 */
.autopilot-bar[hidden] { display: none; }
.autopilot-bar:empty { display: none; }
.autopilot-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.autopilot-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  user-select: none;
}
.autopilot-toggle input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 38px;
  height: 20px;
  border-radius: 999px;
  background: #d3d9e6;
  position: relative;
  transition: background var(--t-fast, 0.15s);
  cursor: pointer;
  margin: 0;
  flex: none;
}
.autopilot-toggle input[type="checkbox"]::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform var(--t-fast, 0.15s);
}
.autopilot-toggle input[type="checkbox"]:checked {
  background: linear-gradient(135deg, #50b8c0, #4f6ef7);
}
.autopilot-toggle input[type="checkbox"]:checked::after { transform: translateX(18px); }
.autopilot-toggle input[type="checkbox"]:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.autopilot-state { font-size: 12px; }
.autopilot-decision {
  font-size: 13px;
  line-height: 1.6;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--primary-soft);
  border: 1px dashed var(--primary);
  color: var(--text);
}
/* 主动干预系统消息内的动作按钮 */
.proactive-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
  justify-content: center;
}
.proactive-btn {
  font-size: 12.5px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--primary);
  background: var(--primary-soft);
  color: var(--primary-dark);
  cursor: pointer;
  transition: all var(--t-fast, 0.15s);
}
.proactive-btn:hover { background: var(--primary); color: #fff; transform: translateY(-1px); }
.proactive-btn:active { transform: scale(0.97); }

[data-theme="dark"] .autopilot-toggle input[type="checkbox"] { background: #333b52; }
[data-theme="dark"] .autopilot-decision { background: rgba(79, 110, 247, 0.16); border-color: var(--primary); }
[data-theme="dark"] .proactive-btn { background: rgba(79, 110, 247, 0.14); color: #9db1ff; }
[data-theme="dark"] .proactive-btn:hover { background: var(--primary); color: #fff; }

/* ============ 概率锚点卡·事件快捷按钮 + 规则表（线J′ 2026-08-18） ============ */
.prob-quick { margin-bottom: 10px; }
.prob-quick-title { font-size: 12.5px; font-weight: 700; margin-bottom: 6px; }
.prob-quick-row { display: flex; gap: 8px; flex-wrap: wrap; }
.prob-quick-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--hover-bg);
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: all var(--t-fast, 0.15s);
}
.prob-quick-btn:hover { border-color: var(--primary); transform: translateY(-1px); }
.prob-quick-btn:active { transform: scale(0.97); }
.prob-q-delta { font-weight: 800; }
.prob-q-up .prob-q-delta { color: #2f9e63; }
.prob-q-down .prob-q-delta { color: #e5484d; }
[data-theme="dark"] .prob-q-up .prob-q-delta { color: #56d68f; }
[data-theme="dark"] .prob-q-down .prob-q-delta { color: #ff6b6b; }

.prob-rulebook { margin-top: 8px; font-size: 12px; }
.prob-rulebook-summary {
  cursor: pointer;
  color: var(--muted);
  user-select: none;
  padding: 2px 0;
}
.prob-rulebook-summary:hover { color: var(--text); }
.prob-rulebook-body { margin-top: 6px; }
.prob-rule-table { min-width: 0; max-width: 420px; }
.prob-rulebook-note {
  margin-top: 6px;
  font-size: 11.5px;
  line-height: 1.6;
  color: #a85e00;
  background: rgba(245, 159, 0, 0.12);
  padding: 6px 8px;
  border-radius: 8px;
}
[data-theme="dark"] .prob-rulebook-note { color: #ffc964; background: rgba(245, 159, 0, 0.14); }

/* ============ 刷题报告卡（线X2 2026-08-18，渲染进 #quiz-report-body） ============ */
.qr-scope-row { display: flex; gap: 8px; margin-bottom: 10px; }
.qr-scope-btn {
  padding: 5px 14px;
  font-size: 13px;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}
.qr-scope-btn:hover { border-color: var(--primary); color: var(--text); }
.qr-scope-btn.active {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary-dark);
  font-weight: 600;
}
.qr-summary { display: flex; flex-direction: column; gap: 4px; }
.qr-big { display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap; }
.qr-total { font-size: 30px; font-weight: 800; line-height: 1.15; color: var(--text); }
.qr-total em, .qr-rate em { font-style: normal; font-size: 14px; font-weight: 500; color: var(--muted); }
.qr-rate { font-size: 30px; font-weight: 800; line-height: 1.15; color: var(--primary-dark); }
.qr-sub { font-size: 12.5px; }
.qr-section {
  margin-top: 12px;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.qr-modes { margin-top: 6px; display: flex; flex-direction: column; gap: 4px; }
.qr-mode-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 8px;
  background: var(--primary-soft);
  font-size: 13px;
}
.qr-mode-name { color: var(--text); }
.qr-mode-count { color: var(--muted); font-variant-numeric: tabular-nums; }
.qr-wrong { margin-top: 6px; display: flex; flex-direction: column; gap: 4px; }
.qr-point-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 8px;
  background: rgba(229, 72, 77, 0.07);
  font-size: 13px;
}
.qr-point-name { color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.qr-point-n { color: #d13a40; font-weight: 600; font-variant-numeric: tabular-nums; flex-shrink: 0; }
.qr-none { font-size: 13px; color: var(--muted); padding: 4px 0; }
.qr-advice {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.qr-advice-line {
  padding: 7px 10px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  background: rgba(48, 164, 108, 0.12);
  color: #1f8a57;
}
.qr-empty { font-size: 13px; line-height: 1.7; color: var(--muted); }
.qr-empty p + p { margin-top: 4px; }
[data-theme="dark"] .qr-total { color: #fff; }
[data-theme="dark"] .qr-rate { color: #9db1ff; }
[data-theme="dark"] .qr-mode-row { background: #212a47; }
[data-theme="dark"] .qr-mode-name { color: #e6eaf2; }
[data-theme="dark"] .qr-point-row { background: rgba(229, 72, 77, 0.14); }

/* ============ 数学渲染全站化（线C：展示位公式与卷面观感统一） ============ */
/* 行内公式与所在文字同字号（KaTeX 默认 1.21em 在卡片/列表/徽章中偏大）；
   聊天气泡 .bubble（1.06em）与刷题题干/选项 .quiz-q-text（1.05em）/.quiz-opt-text（1em）已有专属字号，不重复覆盖 */
.answer-preview .katex,
.mk-item .katex, .mk-q .katex, .rv-point .katex, .review-item .katex,
.weak-chip .katex, .quiz-point .katex, .quiz-hist-item .katex,
.pl-task .katex, .pl-mech .katex, .pl-summary .katex,
.prob-table .katex, .mk-stats .katex, .week-conclusion .katex { font-size: 1em; }

/* 独立公式（$$...$$）：居中 + 窄屏容器内横滚不溢出 */
.answer-preview .katex-display,
.mk-item .katex-display, .rv-point .katex-display, .review-item .katex-display,
.quiz-q-text .katex-display, .quiz-opt-text .katex-display,
.pl-task .katex-display, .pl-mech .katex-display,
.prob-table .katex-display { margin: 6px auto; overflow-x: auto; overflow-y: hidden; max-width: 100%; }
[data-theme="dark"] .qr-point-name { color: #e6eaf2; }
[data-theme="dark"] .qr-point-n { color: #ff9d9d; }
[data-theme="dark"] .qr-advice-line { background: rgba(48, 164, 108, 0.18); color: #5fd39a; }
[data-theme="dark"] .qr-scope-btn.active { background: #212a47; color: #9db1ff; }

/* ============ 立体几何 3D（线G3D：[GEO3D:] 标签，Plotly scatter3d/Mesh3d） ============ */
.geo3d-holder {
  width: 100%;
  max-width: 100%;
  height: 320px;
  min-height: 260px;
  overflow: hidden;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.35);
}
[data-theme="dark"] .geo3d-holder {
  background: rgba(15, 23, 42, 0.45);
}

/* 线PHY：物理示意图（[PHYSICS:] 标签） */
.physics-holder {
  max-width: 100%;
  margin: 4px 0;
  min-height: 60px; /* 线PHYFIX：holder 兜底高度，防渲染前/异常时塌缩 */
}
.physics-holder svg {
  /* 线PHYFIX v2（总管修"自动放大"）：svg 已带 width=360 height=240 固有尺寸，
     不再 width:100% 撑满气泡——按天然尺寸显示，窄容器才随 max-width 收缩 */
  width: auto;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.45);
}
.physics-holder .ph-line {
  stroke: #4a5568;
  stroke-width: 1.8;
}
.physics-holder .ph-thin {
  stroke-width: 1.2;
}
.physics-holder .ph-dash {
  stroke-dasharray: 5 4;
}
.physics-holder .ph-text {
  fill: #2d3748;
  font-size: 12px;
  font-family: inherit;
}
[data-theme="dark"] .physics-holder svg {
  background: rgba(15, 23, 42, 0.5);
}
[data-theme="dark"] .physics-holder .ph-line {
  stroke: #cbd5e1;
}
[data-theme="dark"] .physics-holder .ph-text {
  fill: #e2e8f0;
}

/* ==========================================================
   线DARK 深色模式 QA 体检（2026-08-18）：
   全站固定浅色块排查——白底浅字 / 刺眼浅色块补 [data-theme="dark"] 覆盖
   ========================================================== */
/* 1) AI 气泡 h4 标题：浅色 h1/h2/h3 均有暗色变体，唯独 h4 漏——深蓝字 #16233f 在暗色气泡上不可读 */
[data-theme="dark"] .bubble h4 { color: #e6eaf2; }
/* 2) 概率锚点修正史 ⚠ 徽标：.prob-red/.prob-down 均有暗色提亮，唯独 .prob-flag 漏——同款红提亮 */
[data-theme="dark"] .prob-flag { color: #ff6b6b; }
/* 3) 顶部 tab hover：浅蓝底 rgba(238,241,254,.75) 在暗色下成刺眼浅块——换暗色 primary-soft 半透明 */
[data-theme="dark"] .tab-btn:hover { background: rgba(33, 42, 71, 0.75); }
/* 4) 错题「新错题/第N轮」徽章：app.js 内联 background:#fdf0e0;color:#b26a00 无法被普通规则覆盖——
    暗色下用 !important 换深米底浅金字（复用 .thread-tab-arch.has-items 暗色同款配色） */
[data-theme="dark"] .mk-item .rv-badge[style],
[data-theme="dark"] .review-item .rv-badge[style] {
  background: #3a2f1d !important;
  color: #e0b36a !important;
}

/* ============ 线GEO2D：数学平面几何图 + 单位圆（[GEO2D:] 标签，纯 SVG） ============ */
.geo2d-holder {
  max-width: 100%;
  margin: 4px 0;
}
.geo2d-holder svg {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.45);
}
.geo2d-holder .g2d-line {
  stroke: #4a5568;
  stroke-width: 1.8;
  fill: none;
}
.geo2d-holder .g2d-dash {
  stroke: #4a5568;
  stroke-width: 1.6;
  stroke-dasharray: 5 4;
  fill: none;
}
.geo2d-holder .g2d-thin {
  stroke: #94a3b8;
  stroke-width: 1.2;
}
.geo2d-holder .g2d-axis {
  stroke: #94a3b8;
  stroke-width: 1.2;
}
.geo2d-holder .g2d-axis-fill {
  fill: #94a3b8;
}
.geo2d-holder .g2d-text {
  fill: #2d3748;
  font-size: 12.5px;
  font-family: inherit;
}
.geo2d-holder .g2d-dot {
  fill: #4a5568;
}
/* 单位圆三角函数线：sin 红 / cos 绿 / tan 蓝（数值标注同色） */
.geo2d-holder .g2d-seg-sin { stroke: #e5484d; stroke-width: 2.2; fill: none; }
.geo2d-holder .g2d-seg-cos { stroke: #30a46c; stroke-width: 2.2; fill: none; }
.geo2d-holder .g2d-seg-tan { stroke: #4a7bff; stroke-width: 2.2; fill: none; }
.geo2d-holder .g2d-text-sin { fill: #e5484d; }
.geo2d-holder .g2d-text-cos { fill: #1f8a56; }
.geo2d-holder .g2d-text-tan { fill: #3d67e0; }
/* 暗色适配 */
[data-theme="dark"] .geo2d-holder svg {
  background: rgba(15, 23, 42, 0.5);
}
[data-theme="dark"] .geo2d-holder .g2d-line,
[data-theme="dark"] .geo2d-holder .g2d-dash {
  stroke: #cbd5e1;
}
[data-theme="dark"] .geo2d-holder .g2d-thin,
[data-theme="dark"] .geo2d-holder .g2d-axis {
  stroke: #64748b;
}
[data-theme="dark"] .geo2d-holder .g2d-axis-fill {
  fill: #64748b;
}
[data-theme="dark"] .geo2d-holder .g2d-text {
  fill: #e2e8f0;
}
[data-theme="dark"] .geo2d-holder .g2d-dot {
  fill: #cbd5e1;
}
[data-theme="dark"] .geo2d-holder .g2d-text-cos { fill: #4fd08c; }
[data-theme="dark"] .geo2d-holder .g2d-text-tan { fill: #7ba4ff; }

/* ================= 线CKT：电路图 [CIRCUIT:]（网格字符法） ================= */
.circuit-holder { display: block; margin: 6px 0; }
.circuit-holder svg { display: block; max-width: 100%; height: auto; }
.circuit-holder .ckt-line { stroke: #334155; stroke-width: 3; stroke-linecap: round; fill: none; }
.circuit-holder .ckt-sym { stroke: #334155; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; fill: none; }
.circuit-holder .ckt-sym-fill { fill: #334155; }
.circuit-holder .ckt-sym-bg { fill: var(--bg); stroke: none; } /* 垫底与背景同色，暗色由 --bg 变量自动适配 */
.circuit-holder .ckt-text { fill: #334155; font-size: 12px; }
.circuit-holder .ckt-dot { fill: #334155; stroke: none; }
[data-theme="dark"] .circuit-holder .ckt-line,
[data-theme="dark"] .circuit-holder .ckt-sym { stroke: #cbd5e1; }
[data-theme="dark"] .circuit-holder .ckt-sym-fill,
[data-theme="dark"] .circuit-holder .ckt-dot { fill: #cbd5e1; }
[data-theme="dark"] .circuit-holder .ckt-text { fill: #e2e8f0; }

/* ================= 记录中心统计图（线CHART：图像能力 E3，Plotly 三图） ================= */
#chart-kp-dist,
#chart-prob-trend,
#chart-subject-radar {
  margin-top: 10px;
  height: 260px;
  max-width: 100%;
  min-width: 0;
}
.chart-empty {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 10px;
  box-sizing: border-box;
}

/* ============ 刷题质量检测（线DQUAL · 假努力雷达 v2，轻量汇总） ============ */
.qual-line {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--primary-soft);
  border: 1px dashed var(--primary);
  color: var(--text);
  font-size: 13px;
  line-height: 1.7;
}
.qual-line .qual-advice {
  display: block;
  margin-top: 2px;
  font-size: 12.5px;
  color: var(--muted);
}
.qual-hist-time {
  font-size: 12px;
  color: var(--muted);
  margin-left: 4px;
}
[data-theme="dark"] .qual-line {
  background: rgba(79, 110, 247, 0.14);
  border-color: var(--primary);
}
[data-theme="dark"] .qual-line .qual-advice,
[data-theme="dark"] .qual-hist-time { color: #aab3c5; }

/* ============ 名师×刷题融合（线MENTOR 2026-08-18：身份头 / 讲评卡 / 寄语条） ============ */
.mentor-head {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  margin-bottom: 10px;
  background: var(--panel);
}
.mentor-motto {
  font-size: 12.5px;
  font-weight: 600;
  color: #8a5a00;
  background: #fff7d6;
  border: 1px solid #f0dc9a;
  border-radius: 8px;
  padding: 6px 10px;
  margin-bottom: 10px;
}
.mentor-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
}
.mentor-hint { font-size: 12px; color: #b08a00; width: 100%; }
.mentor-btn { padding: 4px 12px; font-size: 12.5px; }
.quiz-wrong-item .mentor-btn { margin-left: 6px; }
.mentor-card { margin-top: 8px; }
.mentor-details {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  overflow: hidden;
}
.mentor-details summary {
  cursor: pointer;
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 600;
  background: var(--primary-soft);
  color: var(--text);
  user-select: none;
}
.mentor-details summary:hover { background: #e2e8fd; }
.mentor-body { padding: 10px 12px; font-size: 13.5px; line-height: 1.7; }
.mentor-body .answer-preview { border: none; background: transparent; padding: 0; margin: 0; }
[data-theme="dark"] .mentor-head { color: #9aa4bf; border-color: #2a3145; background: #171c2a; }
[data-theme="dark"] .mentor-motto { color: #ffd86b; background: #2b2815; border-color: #4a4420; }
[data-theme="dark"] .mentor-hint { color: #d9b44a; }
[data-theme="dark"] .mentor-details { border-color: #2a3145; background: #1d2334; }
[data-theme="dark"] .mentor-details summary { background: #232b45; color: #e6eaf2; }
[data-theme="dark"] .mentor-details summary:hover { background: #2c3552; }

/* ==========================================================
   线LAYOUT 解析排版深度重设计（2026-08-18，六科专属色板）
   反馈卡 / 聊天讲解 / 讲评卡 / 小结错题项 统一视觉系统
   --acc 主强调色 + --acc-soft 浅底 tint（亮暗双主题自动切换）；
   未知学科不挂 .subj-* → 回落默认主色，静默降级不引入显式报错
   ========================================================== */

/* 默认强调色（无学科类时的回退：应用主色，暗色提亮） */
:root { --acc: #4f6ef7; --acc-soft: rgba(79, 110, 247, 0.10); }
[data-theme="dark"] { --acc: #5b78ff; --acc-soft: rgba(91, 120, 255, 0.16); }

/* 六科专属色板（亮色 / 暗色提亮，由 app.js subjectAccentClass 挂类） */
.subj-math      { --acc: #3b82f6; --acc-soft: rgba(59, 130, 246, 0.10); }
.subj-physics   { --acc: #06b6d4; --acc-soft: rgba(6, 182, 212, 0.10); }
.subj-chemistry { --acc: #16a34a; --acc-soft: rgba(22, 163, 74, 0.10); }
.subj-biology   { --acc: #ea8c1e; --acc-soft: rgba(234, 140, 30, 0.12); }
.subj-english   { --acc: #64748b; --acc-soft: rgba(100, 116, 139, 0.12); }
.subj-chinese   { --acc: #dc2626; --acc-soft: rgba(220, 38, 38, 0.10); }
[data-theme="dark"] .subj-math      { --acc: #6a9fff; --acc-soft: rgba(106, 159, 255, 0.16); }
[data-theme="dark"] .subj-physics   { --acc: #4dd3e8; --acc-soft: rgba(77, 211, 232, 0.16); }
[data-theme="dark"] .subj-chemistry { --acc: #5fd39a; --acc-soft: rgba(95, 211, 154, 0.16); }
[data-theme="dark"] .subj-biology   { --acc: #ffb054; --acc-soft: rgba(255, 176, 84, 0.16); }
[data-theme="dark"] .subj-english   { --acc: #9aa4bd; --acc-soft: rgba(154, 164, 189, 0.16); }
[data-theme="dark"] .subj-chinese   { --acc: #ff8a8a; --acc-soft: rgba(255, 138, 138, 0.16); }

/* ---------- 反馈卡重做：清晰 1px 边框 + 12px 圆角 + 微阴影 + 顶部学科色条 ---------- */
.quiz-feedback {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 16px 14px;
  margin-top: 14px;
  background: #fbfcfe;
  box-shadow: 0 1px 2px rgba(31, 42, 68, 0.02), 0 3px 12px rgba(31, 42, 68, 0.05);
  overflow: hidden;
}
.quiz-feedback::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--acc);
}
/* 对错大徽章：pill + 浅底 tint（对=绿/错=红语义色，未批改=学科色 tint） */
.quiz-fb-verdict {
  display: inline-block;
  border-radius: 999px;
  padding: 8px 18px;
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 12px;
  line-height: 1.4;
}
.quiz-fb-verdict.ok { background: #e9f7ef; color: #1d7a4e; }
.quiz-fb-verdict.bad { background: #fdecec; color: #b4232a; }
.quiz-fb-verdict.unk { background: var(--acc-soft); color: var(--acc); }
/* 板块间距统一 12px */
.quiz-fb-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.quiz-fb-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  background: #fff;
  font-size: 15px;
  line-height: 1.7;
  margin-top: 12px;
}
.quiz-fb-grid .quiz-fb-item { margin-top: 0; }
/* 板块小标题：12.5px / 600 / 学科色 + 细分隔线 */
.quiz-fb-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--acc);
  margin-bottom: 6px;
  padding-bottom: 5px;
  letter-spacing: 0.3px;
  border-bottom: 1px dashed var(--acc-soft);
}
/* 左对齐统一 + 左侧色条：我的答案/解析/批改用学科色，标准答案保持语义绿 */
.quiz-fb-body { text-align: left; }
.quiz-fb-mine { border-left: 3px solid var(--acc); }
.quiz-fb-std { border-left: 3px solid var(--success); background: #eefaf3; }
.quiz-fb-exp { border-left: 3px solid var(--acc); }
.quiz-fb-fb { border-left: 3px solid var(--acc); }
.quiz-fb-body p { margin: 3px 0; }
.quiz-fb-score {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  color: var(--acc);
  background: var(--acc-soft);
  border-radius: 999px;
  padding: 4px 14px;
  margin-top: 12px;
}

/* ---------- 聊天讲解 .bubble：五段式小标题（题目分析/讲解过程/踩分点/易错点/变式题） ---------- */
.bubble h3, .bubble h4 {
  border-left: 3px solid var(--acc);
  padding-left: 8px;
  color: var(--acc);
}
.bubble blockquote {
  background: var(--acc-soft);
  border-left: 3px solid var(--acc);
  border-radius: 8px;
  padding: 6px 12px;
}
/* 公式块与文字间距协调 */
.bubble .katex-display { margin: 12px 0; }

/* ---------- 讲评卡（.mentor-*）并入同一视觉系统 ---------- */
.mentor-details summary {
  background: var(--acc-soft);
  color: var(--acc);
  border-bottom: 1px dashed var(--acc-soft);
}
.mentor-details summary:hover { background: var(--acc-soft); filter: brightness(1.03); }
.mentor-body { padding: 12px 14px; font-size: 14px; line-height: 1.7; }
/* 小结错题项：学科色左条 + 对齐 */
.quiz-wrong-item {
  border-left: 3px solid var(--acc);
  border-radius: 8px;
  padding: 8px 12px;
  margin-top: 8px;
}

/* 暗色适配（--acc/--acc-soft 已随 [data-theme="dark"] 提亮，这里只补底色） */
[data-theme="dark"] .quiz-feedback { background: #1d2334; }
[data-theme="dark"] .quiz-fb-item { background: #171c2a; }
[data-theme="dark"] .quiz-fb-verdict.unk { background: var(--acc-soft); color: var(--acc); }
[data-theme="dark"] .mentor-details summary { background: var(--acc-soft); color: var(--acc); }
[data-theme="dark"] .mentor-details summary:hover { filter: brightness(1.15); }

/* ==========================================================
   线LAYOUT R2 修正（总管实测打回 2026-08-18）
   P0：空串 add 回归（app.js 判空已修，CSS 无涉）
   P0-2：暗色层级（内卡亮一档+微描边、标准答案绿提亮）
   P1-3：标题统一「3px 左色条 + 加粗」模板
   P1-4：blockquote/注意类可读性（深字/亮字 + 淡 tint + 💡 图标）
   P1-5：我的答案/标准答案对称布局（去不对称底色 + 状态色条 + ✓/✗）
   P2-7：做减法（解析正文透明底 + 左条）
   ========================================================== */

/* P1-5/P2-7：做减法——内卡统一透明底 + 1px 透明边框占位（暗色再补描边层级）；
   我的答案/标准答案对称：去不对称底色，仅靠状态色条 + ✓/✗ 图标区分
   注意：.quiz-fb-item 的 border 简写必须在 mine/std/exp 的 border-left 规则之前，否则覆盖 3px 左条 */
.quiz-fb-item { background: transparent; border: 1px solid transparent; }
.quiz-fb-mine { border-left: 3px solid var(--acc); }
.quiz-feedback.fb-bad .quiz-fb-mine { border-left-color: var(--danger); }
.quiz-feedback.fb-ok .quiz-fb-mine { border-left-color: var(--success); }
.quiz-fb-std { border-left: 3px solid var(--success); }
.quiz-fb-exp { border-left: 3px solid var(--acc); }
.quiz-fb-fb { border-left: 3px solid var(--acc); }
.quiz-fb-mine .quiz-fb-label::before { content: '✗ '; font-weight: 800; color: var(--acc); }
.quiz-feedback.fb-bad .quiz-fb-mine .quiz-fb-label::before { color: var(--danger); }
.quiz-feedback.fb-ok .quiz-fb-mine .quiz-fb-label::before { content: '✓ '; color: var(--success); }
.quiz-fb-std .quiz-fb-label::before { content: '✓ '; font-weight: 800; color: var(--success); }

/* P1-3：板块小标题统一「3px 左色条 + 加粗」模板（去掉 R1 的下划线式分隔线） */
.quiz-fb-label {
  border-bottom: none;
  border-left: 3px solid var(--acc);
  padding: 0 0 0 8px;
  font-weight: 700;
  color: var(--acc);
  font-size: 12.5px;
  margin-bottom: 8px;
  letter-spacing: 0.3px;
}

/* P2-7：解析/批改正文透明底（做减法），公式字号与正文协调 */
.quiz-fb-body .katex { font-size: 1.05em; }
.quiz-fb-body, .mentor-body { font-size: 15px; line-height: 1.7; }

/* P1-4：blockquote/注意类——亮色深字、暗色亮字（--text 自动切换），淡 tint 底 + 💡 图标，非大色块 */
.bubble blockquote {
  color: var(--text);
  background: var(--acc-soft);
  border-left: 3px solid var(--acc);
  border-radius: 8px;
  padding: 6px 12px;
}
.bubble blockquote::before { content: '💡 '; font-style: normal; }
/* 暗色下覆盖既有 [data-theme="dark"] .bubble blockquote 的 muted 灰字——亮字可读（P1-4） */
[data-theme="dark"] .bubble blockquote { color: var(--text); }

/* P1-3：讲评卡标题统一左色条模板（去整条大色块背景，透明底 + 左色条 + 虚线分隔） */
.mentor-details summary {
  background: transparent;
  color: var(--text);
  border-bottom: 1px dashed var(--border);
  border-left: 3px solid var(--acc);
  padding: 10px 12px 8px 10px;
  font-weight: 700;
}
.mentor-details summary:hover { background: var(--acc-soft); filter: none; }

/* P0-2：暗色层级——内卡比外卡亮一档 + 1px 微描边；标准答案语义绿提亮 #5fd39a；
   答错红左条/✗ 提亮 #ff6b6b（--danger 暗色未提亮，局部覆盖） */
[data-theme="dark"] .quiz-fb-item {
  background: #232b45;
  border-color: #2a3145;
  border-left-width: 3px;
  border-left-style: solid;
}
[data-theme="dark"] .quiz-fb-mine { border-left-color: var(--acc); }
[data-theme="dark"] .quiz-feedback.fb-bad .quiz-fb-mine { border-left-color: #ff6b6b; }
[data-theme="dark"] .quiz-feedback.fb-ok .quiz-fb-mine { border-left-color: #5fd39a; }
[data-theme="dark"] .quiz-fb-std { border-left-color: #5fd39a; }
[data-theme="dark"] .quiz-feedback.fb-bad .quiz-fb-mine .quiz-fb-label::before { color: #ff6b6b; }
[data-theme="dark"] .quiz-feedback.fb-ok .quiz-fb-mine .quiz-fb-label::before { color: #5fd39a; }
[data-theme="dark"] .quiz-fb-std .quiz-fb-label::before { color: #5fd39a; }
[data-theme="dark"] .mentor-details summary { background: transparent; color: var(--text); border-left-color: var(--acc); }
[data-theme="dark"] .mentor-details summary:hover { background: var(--acc-soft); }

/* ============ 线N2：掌握度 UI + 推荐闭环（.mastery-*，只追加未碰既有规则） ============ */
.mastery-head { font-size: 13px; font-weight: 600; margin: 10px 0 6px; }
.mastery-rows { display: flex; flex-direction: column; gap: 6px; }
.mastery-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 110px 38px;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel);
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.mastery-row:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.mastery-point { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mastery-bar { height: 8px; background: var(--border); border-radius: 8px; overflow: hidden; }
.mastery-bar-fill { height: 100%; border-radius: 8px; }
.mastery-bar-fill.mastery-low { background: linear-gradient(90deg, #e5484d, #f0870a); }  /* <50 红 */
.mastery-bar-fill.mastery-mid { background: linear-gradient(90deg, #f0a020, #f6c453); }  /* 50-79 黄 */
.mastery-bar-fill.mastery-high { background: linear-gradient(90deg, #30a46c, #5fd39a); } /* ≥80 绿 */
.mastery-pct { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; color: var(--text); }
.mastery-sub { grid-column: 1 / -1; color: var(--muted); font-size: 11.5px; margin-top: -2px; }

/* 推荐条（快练/专题卷共用一行理由） */
.mastery-reco {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 2px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary-soft), #fdf3e3);
  font-size: 13px;
}
.mastery-reco-tag {
  flex-shrink: 0;
  font-weight: 700;
  font-size: 12px;
  color: #b45309;
  background: #fff7e6;
  border: 1px solid #f6d38c;
  border-radius: 999px;
  padding: 2px 10px;
}
.mastery-reco-text { flex: 1; min-width: 180px; color: var(--text); line-height: 1.5; }
.mastery-reco-actions { display: flex; gap: 6px; flex-shrink: 0; }
.mastery-reco-btn { padding: 4px 12px; font-size: 12.5px; }

/* 暗色适配 */
[data-theme="dark"] .mastery-row { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .mastery-row:hover { border-color: var(--primary); }
[data-theme="dark"] .mastery-pct { color: var(--text); }
[data-theme="dark"] .mastery-reco { background: linear-gradient(135deg, #232a45, #2a2336); border-color: #2a3145; }
[data-theme="dark"] .mastery-reco-tag { color: #f6c453; background: #2a2336; border-color: #6b5a1e; }
[data-theme="dark"] .mastery-reco-text { color: var(--text); }

/* ============ 冲刺阶段卡（线SPRINTUI 2026-08-18，渲染进 #sprint-card-body） ============ */
.sprint-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.sprint-countdown { display: flex; align-items: baseline; gap: 6px; }
.sprint-count-num { font-size: 36px; font-weight: 800; line-height: 1.1; color: var(--text); }
.sprint-count-unit { font-size: 15px; color: var(--muted); font-weight: 600; }
.sprint-stage { display: flex; flex-direction: column; gap: 2px; }
.sprint-stage-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(90deg, #4f6ef7, #6a5cf0);
}
.sprint-stage-foundation { background: linear-gradient(90deg, #4f6ef7, #6a5cf0); }
.sprint-stage-intensify { background: linear-gradient(90deg, #30a46c, #56c596); }
.sprint-stage-sprint { background: linear-gradient(90deg, #f59f00, #f7b733); }
.sprint-stage-compress { background: linear-gradient(90deg, #e5484d, #ff6b6b); }
.sprint-stage-maintain { background: linear-gradient(90deg, #8a93a6, #aeb6c4); }
.sprint-tone { font-size: 12.5px; color: var(--muted); }
.sprint-targets {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 12px;
  font-size: 13px;
  color: var(--text);
}
.sprint-target b { color: var(--primary-dark); font-variant-numeric: tabular-nums; }
.sprint-exam-date { font-size: 12px; }
.sprint-strategy {
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--primary-soft);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}
.sprint-weak {
  margin-top: 8px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  background: rgba(245, 159, 0, 0.12);
  font-size: 13px;
  line-height: 1.5;
}
.sprint-weak-tag {
  flex-shrink: 0;
  font-weight: 700;
  color: #a85e00;
}
.sprint-weak-text { color: var(--text); }
.sprint-empty { margin-top: 8px; font-size: 12.5px; line-height: 1.7; }
[data-theme="dark"] .sprint-count-num { color: #fff; }
[data-theme="dark"] .sprint-target b { color: #9db1ff; }
[data-theme="dark"] .sprint-strategy { background: #212a47; }
[data-theme="dark"] .sprint-weak { background: rgba(245, 159, 0, 0.16); }
[data-theme="dark"] .sprint-weak-tag { color: #ffc964; }
[data-theme="dark"] .sprint-weak-text { color: #e6eaf2; }

/* ============ 几何画板（线GEOBOARD：[GEOBOARD:] 标签，原生 Canvas 2D 可拖拽） ============ */
.geoboard-holder {
  width: 100%;
  max-width: 100%;
  height: 320px;
  min-height: 260px;
  overflow: hidden;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.4);
  border: 1px solid var(--border);
  touch-action: none;
  cursor: default;
}
.geoboard-holder .geoboard-canvas {
  display: block;
  width: 100%;
  height: 100%;
}
[data-theme="dark"] .geoboard-holder {
  background: rgba(15, 23, 42, 0.5);
}

/* ============ 资料库检索三活用（线KBDEEP：高亮 / 摘录 / 片段出题） ============ */
.kb-search-zone {
  margin-top: 16px;
  border-top: 1px dashed var(--border);
  padding-top: 14px;
}
.kb-search-results { margin-top: 10px; }
.kb-hit-head { font-size: 13px; color: var(--muted); margin-bottom: 10px; line-height: 1.6; }
.kb-hit {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  margin-bottom: 10px;
  background: var(--panel);
}
.kb-hit-meta { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.kb-hit-text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
  max-height: 180px;
  overflow-y: auto;
  padding: 6px 8px;
  background: #fafbfe;
  border-radius: 8px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-word;
}
.kb-hit-text mark {
  background: #ffe58a;
  color: #7a4a00;
  border-radius: 8px;
  padding: 0 2px;
  font-weight: 600;
}
.kb-hit-actions { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.kb-hit-btn { padding: 3px 12px; font-size: 12.5px; }

/* 暗色适配 */
[data-theme="dark"] .kb-hit { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .kb-hit-text { background: #161c2c; border-color: #2a3145; color: var(--text); }
[data-theme="dark"] .kb-hit-text mark { background: #6b5a1e; color: #ffe58a; }
[data-theme="dark"] .kb-hit-meta { color: var(--muted); }
[data-theme="dark"] .kb-hit-head { color: var(--muted); }

/* ================= 线COSTSPLIT：成本分账面板（档案页，按功能/科目） ================= */
.cost-split { margin-top: 10px; border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; background: var(--panel-bg, #fff); }
.cost-split summary { cursor: pointer; font-size: 13px; color: var(--muted); user-select: none; }
.cost-split summary:hover { color: var(--text); }
.cost-split-body { margin-top: 8px; display: flex; gap: 16px; flex-wrap: wrap; }
.cost-split-group { flex: 1 1 220px; min-width: 0; }
.cost-split-title { font-size: 12.5px; font-weight: 600; margin-bottom: 5px; }
.cost-split-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.cost-split-table th, .cost-split-table td { padding: 3px 6px; text-align: left; border-bottom: 1px solid var(--border); }
.cost-split-table th { color: var(--muted); font-weight: 500; }
.cost-split-table td:nth-child(2), .cost-split-table td:nth-child(3) { text-align: right; font-variant-numeric: tabular-nums; }
.cost-split-table tr.cost-split-total td { font-weight: 600; border-top: 1px solid var(--border); border-bottom: none; }
.cost-split-empty { font-size: 12.5px; color: var(--muted); padding: 2px 0; }
[data-theme="dark"] .cost-split { background: #161c2c; }

/* ============ 线MOBILE 移动端适配（2026-08-18 · 纯追加媒体查询，不删改既有规则；≤768 平板 / ≤480 手机） ============ */
@media (max-width: 768px) {
  /* 线v6.0⑥：移动端底部 TabBar（fixed 底部，等分 6 tab，不滚动） */
  #tab-nav {
    position: fixed; bottom: 0; left: 0; right: 0;
    z-index: 8000;
    padding: 4px 4px calc(4px + env(safe-area-inset-bottom));
    gap: 0;
    border-bottom: none;
    border-top: 1px solid var(--border);
    overflow-x: visible;
  }
  #tab-nav::after { display: none; }  /* 底部等分不需要右端遮罩 */
  .tab-btn {
    flex: 1 1 0; min-width: 0;
    padding: 6px 2px 8px;
    font-size: 10px;
    text-align: center;
    flex-direction: column;
    gap: 2px;
    border-radius: 0;
  }
  .tab-btn::after { left: 20%; right: 20%; bottom: 2px; top: auto; height: 2px; }
  /* 底部 TabBar 占位：body 加 padding-bottom 不遮内容 */
  #app { padding-bottom: 52px; }
  /* ---- 触控通用：可点元素最小高度 40px（min-height 不破坏既有小按钮） ---- */
  .btn, .tab-btn, .icon-btn, #btn-theme, .thread-tab, .thread-tab-add, .thread-tab-arch,
  .choice-chip, .msg-tools button, .quiz-hist-item, .quiz-cleanup-btn, .qr-scope-btn,
  .quiz-mode-card, .preset-item, .preset-grade-btn, .weak-chip, .kb-hit-btn, .quiz-resume-actions .btn,
  .search-chip, .search-fav-filter, .quiz-subnav-chip, .lb-capsule, .mk-filter-select, .mk-filter-input,
  .sync-field {
    min-height: 40px;
  }
  /* 线F007 P2：档案页官方 Key 引导链接触控目标 ≥40px（内联 <a> 转 inline-block 才能生效） */
  .provider-guide-steps a { display: inline-block; min-height: 40px; padding: 8px 4px; line-height: 1.4; }
  /* ---- 全局防横向溢出：媒体元素 / 表格 / 代码块容器 ---- */
  .bubble img, .bubble svg, .bubble canvas, .answer-preview img, .answer-preview svg,
  .quiz-q img, .quiz-q svg, .kb-hit-text img {
    max-width: 100%;
    height: auto;
  }
  .bubble table, .answer-preview table, .kb-hit table, .quiz-feedback table,
  .cost-split-table {
    display: block;
    width: max-content;
    max-width: 100%;
    overflow-x: auto;
  }
  .bubble pre, .answer-preview pre, .kb-hit-text, .pl-scroll, #pl-plan { max-width: 100%; }
  .cost-split-body { flex-direction: column; }
  /* ---- 字号下限：内容 15px 起；输入框 16px 防 iOS 聚焦自动缩放 ---- */
  #input { font-size: 16px; }
  .quiz-input { font-size: 15px; }
  .bubble, .quiz-opt, .quiz-fb-body, .mentor-body { font-size: 15px; }
  .btn { font-size: 14px; }
  .quiz-action-bar .btn, .quiz-action-bar .btn.primary, #btn-send { font-size: 15px; }
  .thread-tab { font-size: 13px; }
  /* ---- 聊天页：输入区触控高度≥48px + 气泡最大宽 + 间距收紧 ---- */
  #chat-header { padding: 10px 14px; }
  #messages { padding: 14px 12px 22px; gap: 12px; }
  .msg { max-width: 92%; }
  .msg.user { max-width: 88%; }
  .msg.ai { max-width: 92%; }
  .msg-tools { gap: 6px; }
  #composer { margin: 0 10px 10px; padding: 10px 10px 12px; }
  #composer-row { gap: 8px; }
  .icon-btn { width: 48px; height: 48px; font-size: 18px; }
  #input { min-height: 48px; padding: 12px 14px; }
  #btn-send { min-height: 48px; padding: 0 20px; }
  /* ---- 对话线程：横向滚动（不换行），隐藏滚动条 ---- */
  .thread-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .thread-bar::-webkit-scrollbar { display: none; }
  .thread-new-form { padding: 10px 12px; }
  .thread-new-form input { flex: 1 1 100%; min-width: 0; } /* 线MOBFIX：≤768 标题输入各占一行 */
  .thread-arch-list { padding: 10px 12px 14px; }
  /* ---- 刷题中心：全宽卡 + 选项≥48px + 配置单列 + 底部操作条触控 ---- */
  .quiz-page-shell { max-width: 100%; margin: 10px; }
  .quiz-head { flex-wrap: wrap; }
  .quiz-head-right { flex-wrap: wrap; gap: 8px; }
  .quiz-weak-summary { padding: 10px 16px; }
  #quiz-body { padding: 14px 14px 22px; }
  .quiz-q { padding: 16px 16px; }
  .quiz-opt { min-height: 48px; }
  .quiz-mode-grid { grid-template-columns: 1fr; }
  .quiz-fb-grid { grid-template-columns: 1fr; }
  .quiz-action-bar { padding: 12px 0 4px; }
  .quiz-action-bar .btn, .quiz-action-bar .btn.primary { min-height: 48px; }
  .quiz-input { min-height: 96px; }
  /* ---- 弹窗 / 卡片 / 栅格 / 表单 ---- */
  .modal { width: 100%; max-width: 100%; max-height: 92vh; border-radius: 8px; }
  .record-card, .panel-card { padding: 14px 14px; }
  .records-scroll, .page-scroll { padding: 14px 12px 26px; }
  .pl-date-row { flex-wrap: wrap; }
  .week-xp-num { font-size: 26px; }
  .field input, .field select, .field textarea, .pl-date-row input[type="date"] {
    min-height: 44px;
    font-size: 15px;
  }
  .quiz-resume { margin: 10px 14px 0; }
  /* 线MOBFIX：宽表格横滚提示（≥769 桌面自然隐藏） */
  .pl-scroll::before, .prob-table-wrap::before {
    content: '↔ 左右滑动查看';
    display: block;
    font-size: 11px;
    color: var(--muted);
    text-align: center;
    padding: 2px 0 4px;
  }
  /* 线MOBFIX：云同步三输入框 / 世界书搜索框 ≤768 纵向堆叠全宽 */
  .sync-field, .sync-code, .sync-ns { flex: 1 1 100%; width: 100%; min-width: 0; }
  .lb-search { flex: 1 1 100%; min-width: 0; }
  /* 线MOBFIX2：资料库页窄屏——卷名输入框全宽 + 世界书学科 chips 不截断 + 知识点行换行 */
  #paper-title { flex: 1 1 100%; min-width: 0; }
  #lb-subjects { flex: 1 1 100%; }
  #lb-subjects .choice-chip { flex-shrink: 0; white-space: nowrap; }
  /* 线F007 P1：学科 chips 行横滑（物理/化学/生物 以后 tab 可滑动查看，不换行截断） */
  #lb-subjects { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  #lb-subjects::-webkit-scrollbar { display: none; }
  .lb-row { flex-wrap: wrap; }
  .lb-row .lb-toggle { width: 100%; margin-left: 0; }
}
@media (max-width: 480px) {
  /* ---- 顶部导航：6 tab 横向滚动（不均分挤压，避免省略号截断） ---- */
  #tab-nav { padding: 4px 6px 0; gap: 2px; overflow-x: auto; -webkit-overflow-scrolling: touch; position: relative; }
  .tab-btn { flex: 0 0 auto; min-width: 64px; padding: 9px 10px 10px; font-size: 12px; white-space: nowrap; }
  .tab-btn::after { left: 6px; right: 6px; }
  /* 线F016#2：右端渐变遮罩提示可横向滚动（半露下一项） */
  #tab-nav::after {
    content: '';
    position: absolute;
    top: 0; right: 0; bottom: 0;
    width: 24px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.85));
    pointer-events: none;
    z-index: 2;
  }
  [data-theme="dark"] #tab-nav::after {
    background: linear-gradient(90deg, transparent, rgba(23,28,42,0.85));
  }
  /* ---- 聊天页 ---- */
  #chat-header { padding: 8px 12px; }
  #header-title { font-size: 15px; }
  .header-right { gap: 6px; }
  #messages { padding: 12px 10px 18px; gap: 10px; }
  .msg { max-width: 96%; }
  .msg.user { max-width: 90%; }
  .bubble { padding: 10px 12px; }
  .bubble h1 { font-size: 17px; }
  .bubble h2 { font-size: 16px; }
  .bubble h3 { font-size: 15px; }
  .bubble h4 { font-size: 14px; }
  .answer-preview h1 { font-size: 17px; }
  .answer-preview h2 { font-size: 16px; }
  .answer-preview h3 { font-size: 15px; }
  .msg .msg-img { max-width: min(100%, 320px); }
  #composer { margin: 0 6px 8px; padding: 8px 8px 10px; border-radius: 8px; }
  #composer-row { gap: 6px; }
  #btn-send { padding: 0 14px; }
  #preview-row .preview-name { max-width: 150px; }
  .thread-bar { padding: 8px 10px 0; }
  .autopilot-bar { padding: 6px 12px 8px; }
  /* ---- 刷题中心 ---- */
  .quiz-page-shell { margin: 0; border-radius: 0; border-left: none; border-right: none; }
  .quiz-head { padding: 10px 12px; }
  #quiz-body { padding: 12px 10px 20px; }
  .quiz-q { padding: 14px 12px; }
  .quiz-opt { padding: 13px 12px; }
  .quiz-feedback { padding: 12px 10px; }
  .quiz-action-bar { gap: 8px; }
  .quiz-mode-card { padding: 14px 12px; gap: 12px; }
  .quiz-mode-icon { width: 42px; height: 42px; font-size: 18px; }
  .quiz-timer { padding: 4px 10px; font-size: 12px; }
  .quiz-hist-item { flex-wrap: wrap; }
  .quiz-resume { margin: 8px 10px 0; }
  /* ---- 记录中心 / 其他页 / 弹窗 ---- */
  .records-scroll, .page-scroll { padding: 10px 8px 20px; }
  .record-card, .panel-card { padding: 12px 10px; }
  .modal { padding: 18px 14px; border-radius: 8px; }
  .modal-actions { flex-direction: column; }
  .modal-actions .btn { width: 100%; min-height: 46px; }
  .warn-box { padding: 24px 16px; max-width: 100%; }
  .page-title { font-size: 16px; }
  .cost-badge { font-size: 12px; }
}

/* ================= 线ESSAY：英语作文批改模式（最小样式，锚定当前末行追加） ================= */
.essay-btn { transition: background 0.2s, color 0.2s, box-shadow 0.2s; }
.essay-btn.essay-active {
  background: var(--primary, #4f6ef7);
  color: #fff;
  box-shadow: 0 0 0 2px var(--focus-ring, rgba(91, 120, 255, 0.35));
}
/* 作文模式输入框提示态 */
#input.essay-input {
  border-color: var(--primary, #4f6ef7);
  box-shadow: 0 0 0 3px var(--focus-ring, rgba(91, 120, 255, 0.2));
}
/* 暗色适配 */
[data-theme="dark"] .essay-btn.essay-active { background: #6a8cff; color: #0d1220; }
[data-theme="dark"] #input.essay-input { border-color: #6a8cff; box-shadow: 0 0 0 3px rgba(106, 140, 255, 0.28); }

/* ============ 线P1-4：全卷讲评（🎤 老师讲评，复用 .mentor-* 讲评卡；仅加最小布局类） ============ */
.paper-review-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
  margin: 6px 0 2px;
}
.paper-review-host { margin-top: 4px; }
.paper-review-host .mentor-card { margin-top: 4px; }

/* ==========================================================
   线LAYOUT R3 解析内容呼吸感（2026-08-18）
   行高放宽 1.85 / 段落间距 ≥10px / 公式边距加宽——
   长推导告别"密不透风"（CSS 层治标，提示层铁律 + 渲染层断行兜底）
   ========================================================== */
.bubble p,
.answer-preview,
.quiz-fb-item,
.mentor-details {
  line-height: 1.85;
}
/* 段落间距 ≥10px：相邻 p 间隔清晰，长段视觉分段 */
.bubble p + p,
.answer-preview p + p,
.quiz-fb-body p + p,
.mentor-body p + p { margin-top: 10px; }
.bubble p { margin: 8px 0; }
/* 行内公式与文字间距加宽（不挤字） */
.bubble .katex,
.quiz-fb-body .katex,
.mentor-body .katex,
.answer-preview .katex { margin: 0 2px; }
/* 独立公式块上下边距 ≥14px，公式与文字呼吸感 */
.bubble .katex-display,
.quiz-fb-body .katex-display,
.mentor-body .katex-display,
.answer-preview .katex-display { margin-top: 14px; margin-bottom: 14px; }
/* 渲染层 <br> 断行后的行距同步 */
.bubble br,
.answer-preview br,
.quiz-fb-body br,
.mentor-body br { line-height: 1.85; }

/* ============ 错题导出打印（线PRINTTREND，设计树 B4） ============ */
/* 页面内按钮小样式（打印窗口内样式由 core/printExport.js printCss() 内联） */
.print-export-btn {
  font-size: 12.5px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--primary);
  background: var(--primary-soft);
  color: var(--primary-dark);
  cursor: pointer;
  transition: all var(--t-fast, 0.15s);
}
.print-export-btn:hover { background: var(--primary); color: #fff; transform: translateY(-1px); }
[data-theme="dark"] .print-export-btn { background: rgba(79, 110, 247, 0.14); color: #9db1ff; }
[data-theme="dark"] .print-export-btn:hover { background: var(--primary); color: #fff; }

/* 页面内打印预览兜底（若未来把 buildMistakePrintHtml 渲染进页面）：A4 卡片不跨页、卷末答案另起页 */
@media print {
  .print-card { break-inside: avoid; page-break-inside: avoid; }
  .print-answers { break-before: page; page-break-before: always; }
  .print-answer { break-inside: avoid; page-break-inside: avoid; }
}


/* ================= 线VISUAL5（总管 MVP）：导航光带 + 克制动效 ================= */
/* ① 导航光带：选中 tab 底部渐变光带（亮暗双主题） */
.tab-btn { position: relative; }
.tab-btn.active::after {
  content: '';
  position: absolute; left: 12%; right: 12%; bottom: 1px; height: 3px;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--primary, #4f6ef7), #8a2be2);
  transition: opacity .2s ease;
}
[data-theme="dark"] .tab-btn.active::after { background: linear-gradient(90deg, #6a9fff, #b78df0); }

/* ② 克制动效：卡片 hover 微抬升 + 阴影过渡（150-200ms，不喧宾夺主） */
.record-card, .quiz-mode-card {
  transition: transform .18s ease, box-shadow .18s ease;
}
.record-card:hover, .quiz-mode-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(30, 41, 82, .12);
}
[data-theme="dark"] .record-card:hover, [data-theme="dark"] .quiz-mode-card:hover {
  box-shadow: 0 6px 18px rgba(0, 0, 0, .38);
}

/* ③ 尊重系统减少动态偏好：全部动效关闭 */
@media (prefers-reduced-motion: reduce) {
  .tab-btn.active::after { transition: none; }
  .record-card, .quiz-mode-card { transition: none; }
  .record-card:hover, .quiz-mode-card:hover { transform: none; }
}

/* ============ 错题分类筛选 + 错题行重排（线MISTAKEX 2026-08-18） ============ */
.mk-filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin: 10px 0 8px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--hover-bg);
}
.mk-filter-select,
.mk-filter-input {
  padding: 5px 10px;
  font-size: 13px;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  outline: none;
}
.mk-filter-select:focus,
.mk-filter-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }
.mk-filter-input { flex: 1; min-width: 140px; }

/* 错题行：信息重排（学科徽章 + 主区 + 右侧状态/操作分组） */
.mk-row { display: flex; align-items: center; gap: 12px; }
.mk-row-subj {
  flex-shrink: 0;
  min-width: 44px;
  text-align: center;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: var(--acc, var(--text));
  background: var(--acc-soft, var(--primary-soft));
  border: 1px solid color-mix(in srgb, var(--acc, var(--primary)) 35%, transparent);
}
.mk-row-main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.mk-row-top { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.mk-row-point { font-weight: 600; color: var(--text); }
.mk-row-meta { font-size: 12px; }
.mk-row-side { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.mk-row-reason { font-size: 15px; line-height: 1; cursor: default; }
.mk-st-badge {
  flex-shrink: 0;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}
.mk-st-due { background: rgba(229, 72, 77, 0.12); color: #c0392b; }
.mk-st-today { background: rgba(245, 159, 0, 0.14); color: #a85e00; }
.mk-st-mastered { background: rgba(48, 164, 108, 0.12); color: #1f8a57; }
.mk-row-actions { display: flex; gap: 6px; flex-shrink: 0; }
.mk-row-actions .btn { padding: 4px 10px; font-size: 12.5px; white-space: nowrap; }
.mk-empty-filter {
  padding: 14px 12px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text);
  line-height: 1.7;
  background: var(--hover-bg);
}
[data-theme="dark"] .mk-filter-bar { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .mk-filter-select,
[data-theme="dark"] .mk-filter-input { background: #171c2a; color: var(--text); border-color: #2a3145; }
[data-theme="dark"] .mk-st-due { background: rgba(229, 72, 77, 0.18); color: #ff9d9d; }
[data-theme="dark"] .mk-st-today { background: rgba(245, 159, 0, 0.18); color: #ffc964; }
[data-theme="dark"] .mk-st-mastered { background: rgba(48, 164, 108, 0.18); color: #5fd39a; }
[data-theme="dark"] .mk-empty-filter { background: #1d2334; border-color: #2a3145; }

/* ==========================================================
   线FORMULAX 修复（2026-08-18）
   掌握度趋势容器高度（空图根因：记录中心三图有 260px，#mastery-trend 无高度 → Plotly 渲染 0 高 → 空图）
   ========================================================== */
#mastery-trend {
  height: 260px;
  max-width: 100%;
  min-width: 0;
}

/* ================= 线CHATX：🧠 深度思考开关 + 流式气泡（锚定当前末行追加） ================= */
.think-btn { transition: background 0.2s, color 0.2s, box-shadow 0.2s; }
.think-btn.think-active {
  background: var(--primary, #4f6ef7);
  color: #fff;
  box-shadow: 0 0 0 2px var(--focus-ring, rgba(91, 120, 255, 0.35));
}
[data-theme="dark"] .think-btn.think-active { background: #6a8cff; color: #0d1220; }
/* 线SEARCH：🔍 联网开关激活态（与 🧠 并排同语言）+ AI 气泡来源行 */
.web-search-btn { transition: background 0.2s, color 0.2s, box-shadow 0.2s; }
.web-search-btn.search-active {
  background: #0ea5b7;
  color: #fff;
  box-shadow: 0 0 0 2px rgba(14, 165, 183, 0.35);
}
[data-theme="dark"] .web-search-btn.search-active { background: #2fb3c4; color: #0d1220; }
.bubble-cite {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
  font-size: 12.5px;
  line-height: 1.7;
}
.bubble-cite a { color: var(--primary-dark); text-decoration: none; }
.bubble-cite a:hover { text-decoration: underline; }
[data-theme="dark"] .bubble-cite a { color: #9db1ff; }
/* 流式渐进输出：增量阶段占位容器（完成后整段替换为 .bubble 内容） */
.stream-content { white-space: pre-wrap; word-break: break-word; line-height: 1.7; }
[data-theme="dark"] .stream-content { color: var(--text); }

/* ==========================================================
   线VISUAL5 视觉批次5（2026-08-18 · 纯视觉零功能；追加不删改，未覆盖 /* 线MOBILE */ 块）
   ①导航光带时序对齐 ②克制动效 ③图标统一
   ========================================================== */

/* ---------- ① 导航光带：tab 选中下划线/顶部光带时序统一为 200ms ease（线D4 已建立蓝紫渐变+暗色提亮，此处仅对齐动效参数） ---------- */
.tab-btn::after { transition: transform 0.2s ease, opacity 0.2s ease; }
#tab-nav::before { transition: opacity 0.2s ease; }

/* ---------- ② 克制动效：记录中心卡片 hover 上浮 + 阴影过渡（150-200ms；仅 .record-card/.quiz-mode-card 类族，.quiz-mode-card 已有同参 hover 不动） ---------- */
.record-card {
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.record-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(79, 110, 247, 0.35);
}
/* 尊重系统降动效：克制动效全关（transform 归零 + 过渡即时；呼吸/脉冲类大动效全站本就没有） */
@media (prefers-reduced-motion: reduce) {
  .record-card, .quiz-mode-card { transition: none; }
  .record-card:hover, .quiz-mode-card:hover { transform: none; box-shadow: var(--shadow-sm); }
}

/* ---------- ③ 图标统一：.btn-icon 规范类 + 全站 .btn 字号统一到 14px（行内 emoji 随之 14px，与 ≤768 档一致） ---------- */
/* .btn-icon 规范类：按钮内 emoji 图标的统一尺寸/对齐/间距。
   用法：<button class="btn"><span class="btn-icon">📷</span> 上传</button>
   说明：新按钮/改造按钮建议用 span 包裹 emoji 并加本类；既有未包裹按钮不强制改造（兼容现状，行内 emoji 随 .btn 14px 天然统一） */
.btn-icon {
  display: inline-block;
  font-size: 15px;
  line-height: 1;
  vertical-align: -0.1em;
  margin-right: 5px;
}
/* 全站 .btn 字号 13.5→14px：行内 emoji 达到 14-16px 规范区间，且桌面与 MOBILE(≤768) 档一致 */
.btn { font-size: 14px; }

/* ==========================================================
   线UIFIX 刷题中心二级导航（2026-08-18）
   模式 chips 常驻在 quiz-head 下——薄弱点摘要被挤出首屏后仍可一键进模式
   ========================================================== */
.quiz-subnav {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 8px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.quiz-subnav-chip {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--t-fast);
}
.quiz-subnav-chip:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  background: var(--primary-soft);
}
.quiz-subnav-chip.active {
  background: var(--send-grad);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(79, 110, 247, 0.25);
}
[data-theme="dark"] .quiz-subnav { background: #171c2a; }
[data-theme="dark"] .quiz-subnav-chip { color: #9aa4bd; }
[data-theme="dark"] .quiz-subnav-chip:hover { color: #c9d2ff; background: #212a47; }
[data-theme="dark"] .quiz-subnav-chip.active {
  background: linear-gradient(135deg, #4f6ef7, #6a5cf0);
  color: #fff;
}
@media (max-width: 640px) {
  .quiz-subnav { padding: 6px 12px; gap: 6px; }
  .quiz-subnav-chip { padding: 4px 11px; font-size: 12.5px; }
}

/* ==========================================================
   #52 资料库 5 标签导航（线KB52，8.24 开工）——复用 quiz-subnav 视觉
   ========================================================== */
.kb-subnav {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 8px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.kb-tab-chip {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--t-fast);
}
.kb-tab-chip:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  background: var(--primary-soft);
}
.kb-tab-chip.active {
  background: var(--send-grad);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(79, 110, 247, 0.25);
}
[data-theme="dark"] .kb-subnav { background: #171c2a; }
[data-theme="dark"] .kb-tab-chip { color: #9aa4bd; }
[data-theme="dark"] .kb-tab-chip:hover { color: #c9d2ff; background: #212a47; }
[data-theme="dark"] .kb-tab-chip.active {
  background: linear-gradient(135deg, #4f6ef7, #6a5cf0);
  color: #fff;
}
@media (max-width: 640px) {
  .kb-subnav { padding: 6px 12px; gap: 6px; }
  .kb-tab-chip { padding: 4px 11px; font-size: 12.5px; }
}

/* ==========================================================
   #52 Step 3: Wiki 布局统一卡片网格（8.24-8.25，线KB52-WIKI）
   各 zone 列表容器可加 .kb-card-grid 统一卡片网格风格
   ========================================================== */
.kb-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 10px;
  margin-top: 8px;
}
.kb-card {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  transition: border-color var(--t-fast);
}
.kb-card:hover { border-color: var(--primary); }
[data-theme="dark"] .kb-card { background: #1a2035; border-color: #2a3145; }
@media (max-width: 640px) {
  .kb-card-grid { grid-template-columns: 1fr; }
}

/* L-048①A：缓存命中「🔄 重新讲解」按钮 */
.cache-retry-btn {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  font-size: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  vertical-align: middle;
}
.cache-retry-btn:hover { background: var(--primary); color: #fff; }

/* ==========================================================
   线UIFIX 线程区「新对话式」（2026-08-18，视觉外壳重构；switchThread/threadState 逻辑未动）
   顶部醒目「＋ 新对话」+ 线程列表紧凑 + 归档折叠收进 📦
   ========================================================== */
.thread-bar {
  gap: 4px;
  padding: 6px 18px 6px;
}
.thread-tab {
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 999px;
}
/* 「＋ 新对话」醒目：渐变底白字（视觉优先于普通 tab） */
.thread-tab-add {
  background: var(--send-grad);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(79, 110, 247, 0.25);
}
.thread-tab-add:hover {
  background: var(--send-grad);
  color: #fff;
  filter: brightness(1.07);
}
/* 归档 / 更新记忆：更小更紧凑（折叠入口） */
.thread-tab-arch,
.thread-tab-mem {
  padding: 3px 8px;
  font-size: 11.5px;
  background: transparent;
}
/* 新对话表单紧凑（内嵌表单不弹窗） */
.thread-new-form {
  padding: 6px 18px;
  gap: 6px;
}
.thread-new-form select,
.thread-new-form input { padding: 5px 10px; font-size: 12.5px; }
/* 暗色 */
[data-theme="dark"] .thread-tab-add {
  background: linear-gradient(135deg, #4f6ef7, #6a5cf0);
  color: #fff;
  box-shadow: 0 2px 10px rgba(91, 120, 255, 0.3);
}
[data-theme="dark"] .thread-tab-add:hover { filter: brightness(1.1); }


/* ============ 真题卷（线PAPERIMPORT 2026-08-18：资料库页真题区 .paper-* 最小样式） ============ */
.paper-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
}
.paper-title { font-size: 13px; min-width: 0; }
.paper-title b { color: var(--text); }
.paper-actions { display: flex; gap: 6px; flex-wrap: wrap; white-space: nowrap; }
#paper-zone select,
#paper-zone input[type="text"],
#paper-zone input:not([type]),
#paper-zone textarea {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  background: #fafbfe;
  color: var(--text);
  outline: none;
}
#paper-zone textarea { width: 100%; box-sizing: border-box; resize: vertical; }
#paper-zone select { flex: 0 0 auto; }
#paper-title { flex: 1; min-width: 160px; } /* 线MOBFIX2：卷名输入框（内联 min-width 改规则，≤768 全宽见媒体块） */
[data-theme="dark"] #paper-zone select,
[data-theme="dark"] #paper-zone input[type="text"],
[data-theme="dark"] #paper-zone input:not([type]),
[data-theme="dark"] #paper-zone textarea { background: #1d2334; color: var(--text); }

/* ==========================================================
   线ICON 按钮图标统一（2026-08-18 · 视觉批次5 遗留；追加不删改既有规则）
   .btn-icon 规范类（升级覆盖线VISUAL5 的初版定义，同选择器后写胜出）：
   inline-flex 垂直居中 + 图标 15px（14-16px 区间）+ 右侧间距 6px + line-height 1 防撑高按钮
   用法：<button class="btn"><span class="btn-icon">🤖</span> AI 生成计划</button>
   说明：emoji/文字符号用 span 包裹后尺寸与对齐全站统一；未包裹按钮行内 emoji 随 .btn 14px 保持兼容
   ========================================================== */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  line-height: 1;
  margin-right: 6px;
  vertical-align: middle;
}
/* 尾部图标变体（如「下一题 ➜」）：箭头/符号在文字之后时改左侧间距、去右侧 */
.btn-icon-end {
  margin-right: 0;
  margin-left: 6px;
}
/* 小按钮场景（.msg-tools / .thread-tab 等 12px 按钮）：图标继承按钮字号（1.1em≈13px），间距收窄，与 14px 主按钮视觉均衡 */
.btn-icon-sm {
  font-size: 1.1em;
  margin-right: 4px;
}
/* 暗色适配：emoji 为彩色字形不受主题影响；文字符号（⌂↻⬇⬆➜）随按钮文字色继承
   （.btn.primary 白字按钮内自动白色，浅色按钮内 var(--text) 自动深色），无需额外覆盖；
   若未来引入自绘图标可在此追加 [data-theme="dark"] .btn-icon 提亮变体 */

/* ==========================================================
   线CSSAUDIT 全站 flex 滚动链/溢出链安全属性（2026-08-18）
   只补 min-height:0 / min-width:0（flex 链关键安全属性），不改任何视觉规则——
   用户连续报"滚不动 / 横向溢出 / 空白"同族病（父链缺 min-height:0 阻断子滚动容器收缩、
   flex row 子项缺 min-width:0 被内容撑破）；已修 3 处（.quiz-page-shell 缺 min-height:0 /
   .thread-bar 缺 min-width:0 / #sidebar 窄屏 min-width:0），本块全站加固防复发
   ========================================================== */
/* 垂直滚动容器显式 min-height:0（overflow-y:auto 时浏览器通常自动视为 0，此处显式加固嵌套/引擎差异，
   确保"滚不动"不再复发：聊天消息流 / 侧边栏 / 记录中心 / 资料库档案 / 刷题题卡区） */
#messages,
#sidebar,
.records-scroll,
.page-scroll,
#quiz-body { min-height: 0; }
/* flex 中间节点（非滚动但承重）：补 min-height:0 双保险，确保子滚动容器高度受限（#chat-area 已有 min-width:0） */
#chat-area { min-height: 0; }
/* 横向溢出链：flex/块级子项 min-width:0（内容超宽时容器自滚/裁切，不撑出页面） */
.panel-card { min-width: 0; }

/* ============ 联网搜索页（线SEARCH 阶段三：第 6 tab） ============ */
.search-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.search-row { display: flex; gap: 8px; }
.search-row input[type="text"], .search-row input:not([type]) {
  flex: 1;
  min-width: 0;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 14px;
  background: #fafbfe;
  color: var(--text);
  outline: none;
}
.search-row input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }
.search-options { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.search-time {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 13px;
  background: #fafbfe;
  color: var(--text);
}
.search-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.search-chip {
  border: 1px solid var(--border);
  background: var(--primary-soft);
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 12.5px;
  cursor: pointer;
  transition: all 0.15s;
}
.search-chip:hover { border-color: var(--primary); }
.search-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 10px;
}
.search-item-head { margin-bottom: 4px; }
.search-item-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-dark);
  text-decoration: none;
  word-break: break-all;
}
.search-item-title:hover { text-decoration: underline; }
.search-item-snippet {
  font-size: 13px;
  color: var(--text);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-item-src {
  font-size: 11.5px;
  color: var(--muted);
  word-break: break-all;
  margin-top: 2px;
}
.search-item-acts { margin-top: 6px; }
.search-fav-bar { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.search-fav-filter {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--muted);
  border-radius: 999px;
  padding: 3px 11px;
  font-size: 12px;
  cursor: pointer;
}
.search-fav-filter.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}
.search-hist-item {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  margin-bottom: 8px;
}
.search-hist-item.fav { border-color: #f0b429; }
.search-hist-q { font-size: 13.5px; font-weight: 600; color: var(--text); word-break: break-all; }
.search-hist-q .rv-badge { font-size: 11px; margin-left: 4px; }
.search-hist-meta { font-size: 11.5px; color: var(--muted); margin-top: 2px; }
.search-hist-acts { display: flex; gap: 6px; margin-top: 6px; flex-wrap: wrap; }
.search-hist-btn { padding: 3px 10px; font-size: 12px; }
[data-theme="dark"] .search-box { background: #171c2a; border-color: #2a3145; }
[data-theme="dark"] .search-row input:not([type]), [data-theme="dark"] .search-row input[type="text"] { background: #1d2334; color: var(--text); border-color: #2a3145; }
[data-theme="dark"] .search-time { background: #1d2334; color: var(--text); border-color: #2a3145; }
[data-theme="dark"] .search-chip { background: rgba(79, 110, 247, 0.16); color: #9db1ff; border-color: #2a3145; }
[data-theme="dark"] .search-item, [data-theme="dark"] .search-hist-item { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .search-item-title { color: #9db1ff; }
[data-theme="dark"] .search-fav-filter { background: #1d2334; color: #9aa4bf; border-color: #2a3145; }
[data-theme="dark"] .search-fav-filter.active { background: var(--primary); color: #fff; }

/* 线SEARCH3CSS：搜索五项修复尾巴——3 个新元素补样式 */
.search-item-title-nolink { font-size: 15px; font-weight: 600; color: var(--text); line-height: 1.5; }
.search-official-links { margin: 4px 0; padding: 6px 8px; border-left: 3px solid var(--primary, #4f6ef7); background: var(--hover-bg); border-radius: 8px; font-size: 13px; }
.search-official-links a { color: var(--primary, #4f6ef7); margin-right: 8px; }
.search-official-links a:hover { text-decoration: underline; }
.search-insufficient { margin: 6px 0; padding: 8px 10px; border: 1px dashed #e6a700; background: #fff8e6; border-radius: 8px; font-size: 13px; color: #8a6500; }
[data-theme="dark"] .search-item-title-nolink { color: #c9d4f0; }
[data-theme="dark"] .search-official-links { background: #1d2334; border-color: #4f6ef7; }
[data-theme="dark"] .search-insufficient { background: #2a2410; border-color: #8a6500; color: #e6c070; }

/* 线CSSGAP2：补缺样式——ckt-warn-bar（电路图警告条）+ thinking-title（深度思考标题） */
.ckt-warn-bar { margin: 6px 0; padding: 8px 10px; border: 1px solid #e6a700; background: #fff8e6; border-radius: 8px; font-size: 13px; color: #8a6500; }
.ckt-warn-bar button { margin-left: 8px; padding: 2px 8px; font-size: 12px; cursor: pointer; }
.thinking-title { font-size: 14px; font-weight: 600; color: var(--text, #333); margin-right: 6px; }
[data-theme="dark"] .ckt-warn-bar { background: #2a2410; border-color: #8a6500; color: #e6c070; }
[data-theme="dark"] .thinking-title { color: #c9d4f0; }

/* 线QUIZWIRE 补缺：五年分项题目答案/解析折叠 */
.quiz5y-ans { margin: 4px 0; border-left: 3px solid var(--primary, #4f6ef7); background: var(--hover-bg, #f5f6fa); border-radius: 8px; }
.quiz5y-ans summary { padding: 4px 8px; cursor: pointer; font-size: 13px; user-select: none; }
.quiz5y-ans summary:hover { background: rgba(79,110,247,0.08); border-radius: 8px; }
.quiz5y-ans-body { padding: 6px 10px; font-size: 14px; line-height: 1.6; white-space: pre-wrap; word-break: break-word; }
[data-theme="dark"] .quiz5y-ans { background: #1d2334; border-color: #4f6ef7; }

/* ================= 线PHOTOGRADE：拍照批改（A期入口按钮 / loading / 结果卡操作行，纯追加不覆盖既有规则） ================= */
.photo-grade-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 8px; }
.photo-grade-btn { padding: 5px 12px; font-size: 12.5px; }
.photo-grade-btn.photo-grade-loading { opacity: 0.7; cursor: wait; }
.photo-grade-card { margin-top: 8px; }
.photo-grade-card .mentor-body { overflow-wrap: anywhere; }
.photo-grade-raw { max-height: 200px; overflow: auto; white-space: pre-wrap; word-break: break-word; background: #f6f7f9; padding: 10px; border-radius: 8px; font-size: 13px; line-height: 1.6; margin: 8px 0; }
[data-theme="dark"] .photo-grade-raw { background: #1e1e2a; color: #cdd6f4; }
[data-theme="dark"] .photo-grade-btn.photo-grade-loading { opacity: 0.6; }

/* ================= 线CHATUX：聊天体验二批（三点动画 / 思考折叠块 / 图片灯箱，纯追加不覆盖既有规则） ================= */

/* 三点周期上下跳动（等待动画；错相 0.15s） */
.think-dots { display: inline-flex; gap: 4px; margin-left: 6px; vertical-align: middle; }
.think-dots span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--primary);
  display: inline-block;
  animation: thinkBounce 1s ease-in-out infinite;
}
.think-dots span:nth-child(2) { animation-delay: 0.15s; }
.think-dots span:nth-child(3) { animation-delay: 0.3s; }
@keyframes thinkBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-5px); opacity: 1; }
}
[data-theme="dark"] .think-dots span { background: #9db1ff; }

/* 流式占位「正在思考…」（首 delta 前显示，随后被整体重渲替换） */
.stream-thinking { color: var(--muted); font-size: 13px; }

/* 思考过程折叠块（答案气泡上方独立块，默认收起） */
.thinking-block {
  background: var(--primary-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  max-width: 100%;
  overflow: hidden;
}
.thinking-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  font-size: 12.5px;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}
.thinking-header:hover { background: var(--hover-bg); }
.thinking-arrow { color: var(--muted); font-size: 12px; transition: transform 0.15s; }
.thinking-body {
  display: none;
  padding: 8px 12px 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
  border-top: 1px solid var(--border);
  background: var(--panel);
}
.thinking-block.thinking-open .thinking-body { display: block; }

[data-theme="dark"] .thinking-block { background: rgba(79, 110, 247, 0.12); border-color: #2a3145; }
[data-theme="dark"] .thinking-header { color: #c7cee0; }
[data-theme="dark"] .thinking-header:hover { background: rgba(79, 110, 247, 0.08); }
[data-theme="dark"] .thinking-body { background: #171c2a; border-color: #2a3145; color: #9aa4bf; }

/* 图片灯箱：全屏遮罩 + 居中大图 + 右上角 ✕ */
.lightbox {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.8);
  z-index: 100000;
  display: none;
  align-items: center; justify-content: center;
  cursor: zoom-out;
}
.lightbox.lightbox-open { display: flex; }
.lightbox-img {
  max-width: 90vw; max-height: 85vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
  cursor: default;
}
.lightbox-close {
  position: absolute; top: 18px; right: 22px;
  width: 44px; height: 44px;
  font-size: 24px; line-height: 1;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border: none; border-radius: 50%;
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.28); transform: scale(1.08); }
[data-theme="dark"] .lightbox { background: rgba(0, 0, 0, 0.85); }
[data-theme="dark"] .lightbox-close { background: rgba(255, 255, 255, 0.14); }
[data-theme="dark"] .lightbox-close:hover { background: rgba(255, 255, 255, 0.3); }

/* ================= 线DRAFTPAD：草稿纸（原生 Canvas 2D 零依赖，纯追加不覆盖既有规则） ================= */
.draftpad-panel {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: min(560px, 92vw);
  height: 300px;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
  z-index: 90000;
  overflow: hidden;
}
.draftpad-panel[hidden] { display: none; }

.draftpad-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  flex: 0 0 auto;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  user-select: none;
}
.draftpad-toolbar button {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  font-size: 12.5px;
  line-height: 1;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
}
.draftpad-toolbar button:hover { background: var(--hover-bg); }
.draftpad-toolbar button.active {
  border-color: var(--primary);
  background: var(--primary-soft);
  color: var(--primary);
}
.draftpad-color {
  width: 24px;
  height: 24px;
  padding: 0 !important;
  border-radius: 50% !important;
  border: 2px solid transparent !important;
  box-sizing: border-box;
}
.draftpad-color.active {
  border-color: var(--primary) !important;
  box-shadow: 0 0 0 2px rgba(79, 110, 247, 0.25);
}
.draftpad-spacer { flex: 1 1 0; }

/* 画布：宽度铺满、高度 = 面板 300px - 工具条（flex:1 自适应）；touch-action:none 防手势滚动 */
.draftpad-canvas {
  flex: 1 1 auto;
  min-height: 0;
  width: 100%;
  display: block;
  touch-action: none;
  background: var(--bg);
  cursor: crosshair;
}

/* 折叠：40px 高只露工具条（↕ 再点展开） */
.draftpad-panel.draftpad-collapsed { height: 40px; }
.draftpad-panel.draftpad-collapsed .draftpad-canvas { display: none; }

/* 全屏：inset:0 铺满视口 */
.draftpad-panel.draftpad-full {
  inset: 0;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  transform: none;
  border-radius: 0;
  z-index: 100000;
}

/* 入口按钮（刷题卡 ✏️ 与聊天输入区 ✏️ 草稿） */
.draftpad-btn { padding: 5px 12px; font-size: 12.5px; }
.icon-btn.draft-btn { width: auto; padding: 0 10px; font-size: 13px; }
.icon-btn.pg-text-btn { width: auto; padding: 0 10px; font-size: 13px; } /* 线MOBFIX：拍照批改文字按钮（内联 width:auto 改类名） */

/* 暗色适配 */
[data-theme="dark"] .draftpad-toolbar button { background: #1d2334; border-color: #2a3145; color: #c7cee0; }
[data-theme="dark"] .draftpad-toolbar button:hover { background: #232b45; }
[data-theme="dark"] .draftpad-toolbar button.active { background: var(--primary-soft); border-color: var(--primary); color: #9db1ff; }

/* 移动端 ≤480px：面板 40vh 高、100vw 宽（设计树尺寸口径） */
@media (max-width: 480px) {
  .draftpad-panel {
    height: 40vh;
    width: 100vw;
    left: 0;
    right: 0;
    bottom: 0;
    transform: none;
    border-radius: 0;
  }
}

/* ================= 线PROVIDER：模型与 API 卡（列表行/表单/绿点/状态行/暗色适配） ================= */
.provider-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.provider-row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--panel);
}
.provider-row.provider-builtin { background: var(--primary-soft); border-color: transparent; }
.provider-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--success); flex: 0 0 auto; }
.provider-dot-custom { background: var(--primary); }
.provider-row-info { flex: 1 1 auto; min-width: 0; }
.provider-row-name { font-weight: 600; font-size: 13.5px; display: flex; align-items: center; gap: 6px; }
.provider-row-sub { font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.provider-row-acts { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.provider-default-tag { font-size: 11px; color: var(--primary); background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 0 6px; }
.provider-active-tag { font-size: 11px; color: var(--success); font-weight: 600; white-space: nowrap; }
.provider-btn { padding: 5px 12px; font-size: 13px; border-radius: 8px; }
.provider-btn-del { color: var(--danger); }
.provider-form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.provider-form-grid label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.provider-form-grid input, .provider-form-grid select {
  padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 13px; background: transparent; color: inherit;
}
.provider-test-result { margin-top: 10px; padding: 10px; border: 1px dashed var(--border); border-radius: 8px; font-size: 13px; }
.provider-test-title { font-weight: 600; margin-bottom: 6px; }
.provider-model-chip { display: inline-flex; align-items: center; gap: 6px; margin: 2px 4px 2px 0; padding: 4px 8px 4px 10px; background: var(--hover-bg); border: 1px solid var(--border); border-radius: 8px; font-size: 13px; color: var(--text); }
@media (max-width: 600px) { .provider-form-grid { grid-template-columns: 1fr; } }
[data-theme="dark"] .provider-row { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .provider-row.provider-builtin { background: #232b45; }
[data-theme="dark"] .provider-default-tag { background: #232b45; color: #9db1ff; }
[data-theme="dark"] .provider-form-grid input, [data-theme="dark"] .provider-form-grid select { border-color: #2a3145; }
[data-theme="dark"] .provider-model-chip { background: #232b45; }

/* ================= 线PROVIDERV2：表单分区卡片 + 预设按钮 + 模型 chip 编辑器 + 回传思考开关 ================= */
.provider-form { display: flex; flex-direction: column; gap: 10px; }

/* 预设按钮行（📋 预设） */
.provider-preset-row {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--hover-bg);
}
.provider-preset-label { font-size: 13px; font-weight: 600; color: var(--text); }
.provider-preset-chip {
  font-size: 13px; padding: 5px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: transparent; color: var(--text); cursor: pointer;
  line-height: 1.4; transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}
.provider-preset-chip:hover { border-color: var(--primary); }
.provider-preset-chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.provider-preset-hint { font-size: 12px; }

/* L-038②: 数据流向披露行（dataNote，预设选中时显示） */
.provider-datanote {
  padding: 8px 12px; border-radius: 8px; font-size: 12.5px; line-height: 1.5;
  background: rgba(255, 193, 7, 0.08); border: 1px solid rgba(255, 193, 7, 0.3); color: #856404;
}
[data-theme="dark"] .provider-datanote { background: rgba(255, 193, 7, 0.06); border-color: rgba(255, 193, 7, 0.2); color: #ffc107; }

/* 分区卡片（连接信息/模型目录/高级）：圆角 10px、1px var(--border)、统一内边距 */
.provider-section {
  border: 1px solid var(--border); border-radius: 8px; padding: 12px;
  background: var(--hover-bg); display: flex; flex-direction: column; gap: 8px;
}
.provider-section-title { font-size: 13px; font-weight: 700; color: var(--text); }

/* 模型目录 chip 编辑器 */
.provider-model-chips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 32px; }
.provider-model-chips .provider-model-chip { margin: 0; }
.provider-chip-x {
  border: none; background: transparent; color: var(--muted); cursor: pointer;
  font-size: 12px; line-height: 1; padding: 2px; border-radius: 8px;
}
.provider-chip-x:hover { color: var(--danger); }
.provider-model-add-row { display: flex; gap: 8px; }
.provider-model-add-row input {
  flex: 1; padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 13px; background: transparent; color: inherit; min-width: 0;
}

/* 回传历史思考过程开关（选中态蓝底白字 var(--primary)） */
.provider-toggle { display: flex; align-items: flex-start; gap: 10px; cursor: pointer; user-select: none; }
.provider-toggle input[type="checkbox"] {
  appearance: none; -webkit-appearance: none; flex: none; margin-top: 2px;
  width: 40px; height: 22px; border-radius: 999px; background: #d3d9e6;
  position: relative; transition: background var(--t-fast, 0.15s); cursor: pointer;
}
.provider-toggle input[type="checkbox"]::after {
  content: ''; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px;
  border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform var(--t-fast, 0.15s);
}
.provider-toggle input[type="checkbox"]:checked { background: var(--primary); }
.provider-toggle input[type="checkbox"]:checked::after { transform: translateX(18px); }
.provider-toggle input[type="checkbox"]:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.provider-toggle-body { display: flex; flex-direction: column; gap: 2px; }
.provider-toggle-title { font-size: 13px; font-weight: 600; color: var(--text); }
.provider-toggle-desc { font-size: 12px; color: var(--muted); }

/* 暗色适配（复用现有暗色变量 #1d2334/#232b45/#2a3145，不新发明色板） */
[data-theme="dark"] .provider-preset-row { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .provider-preset-chip { border-color: #2a3145; }
[data-theme="dark"] .provider-section { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .provider-chip-x { color: #8b93a7; }
[data-theme="dark"] .provider-model-add-row input { border-color: #2a3145; }
[data-theme="dark"] .provider-toggle input[type="checkbox"] { background: #333b52; }

/* ================= 线MATHCHECK：本地验算警示行 ================= */
.mathcheck-warn {
  margin: 8px 0 4px;
  padding: 8px 10px;
  border: 1px solid #f0c36d;
  border-left: 3px solid #f0a020;
  border-radius: 8px;
  background: #fef6e7;
  color: #8a5a00;
  font-size: 13px;
  line-height: 1.5;
}
[data-theme="dark"] .mathcheck-warn {
  background: #3a2f1d;
  border-color: #8a6d3b;
  border-left-color: #f0a020;
  color: #f0c36d;
}

/* ================= 线WB-UI：世界书分科开关胶囊 ================= */
.lorebook-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  padding: 6px 8px;
}
.lorebook-bar-title { font-size: 12px; color: var(--muted); margin-right: 2px; }
.lb-capsule {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  line-height: 1.4;
}
.lb-capsule:hover { border-color: var(--acc); }
.lb-capsule.lb-paused { background: #fef3c7; border-color: #f0c36d; color: #8a5a00; }
.lb-capsule.lb-off { background: #fdecec; border-color: #e0a0a0; color: #a33; }
[data-theme="dark"] .lb-capsule { border-color: #2a3145; }
[data-theme="dark"] .lb-capsule.lb-paused { background: #3a2f1d; border-color: #8a6d3b; color: #f0c36d; }
[data-theme="dark"] .lb-capsule.lb-off { background: #3a2222; border-color: #7a3b3b; color: #ff9a9a; }

/* ================= 线MOBFIX：内联 min-width 改类名（桌面尺寸；≤768 纵向全宽见媒体块） ================= */
.lb-search { flex: 1; min-width: 180px; }
.lb-trigger { font-size: 12px; margin-top: 2px; } /* 线F007 P2：世界书触发词 11px → 12px（可读性下限，原内联已迁此类） */
.sync-field { flex: 1; min-width: 200px; }
.sync-code { flex: 0 0 auto; width: 120px; min-width: 0; }
.sync-ns { flex: 0 0 auto; width: 170px; min-width: 0; }

/* ================= 线ALLDATA：真题快练入口 ================= */
.quiz-real { margin: 10px 0; padding: 10px; border: 1px dashed var(--border); border-radius: 8px; }
.quiz-real-row { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.quiz-real-btn { font-size: 12.5px; padding: 4px 10px; }
/* 线INTEGRATE #31：Python 计算结果展示 */
.python-result-box { margin: 8px 0; padding: 8px 10px; border: 1px solid var(--border, #e0e3eb); border-radius: 8px; background: var(--hover-bg, #f5f6fa); }
[data-theme="dark"] .python-result-box { background: #1a2035; border-color: #2a3050; }
.python-output pre { margin: 4px 0; padding: 6px 8px; font-family: 'Menlo','Consolas',monospace; font-size: 13px; background: var(--card-bg, #fff); border-radius: 8px; overflow-x: auto; white-space: pre-wrap; }
[data-theme="dark"] .python-output pre { background: #0d1117; color: #c9d1d9; }
.python-output pre.python-error { color: #e5484d; }
.python-run-btn { font-size: 13px; padding: 4px 12px; margin-top: 4px; }

/* 线INTEGRATE #31：Mermaid 图表样式 */
.mermaid-result-box { margin: 8px 0; padding: 8px 10px; border: 1px solid var(--border, #e0e3eb); border-radius: 8px; background: var(--card-bg, #fff); text-align: center; }
[data-theme="dark"] .mermaid-result-box { background: #1a2035; border-color: #2a3050; }
.mermaid-svg svg { max-width: 100%; height: auto; }
.mermaid-svg pre.mermaid-error { text-align: left; color: #e5484d; }

/* 线THEME #15：主题包 CSS 变量覆盖 */
[data-theme-pack] body { background: var(--theme-bg, var(--bg)) !important; }
[data-theme-pack] .card, [data-theme-pack] .msg .bubble, [data-theme-pack] .quiz-page-shell { background: var(--theme-card-bg, var(--card-bg)) !important; }
[data-theme-pack] a, [data-theme-pack] .btn.primary { color: var(--theme-accent, var(--primary)); }

/* 线THEME #15：主题画廊 */
.theme-gallery { display: flex; flex-wrap: wrap; gap: 10px; margin: 10px 0; }
.theme-group-label { width: 100%; font-size: 12px; color: var(--muted); margin-top: 8px; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.theme-pack-item { display: flex; flex-direction: column; align-items: center; gap: 4px; cursor: pointer; padding: 6px; border-radius: 8px; border: 2px solid transparent; transition: border-color 0.2s; }
.theme-pack-item:hover { border-color: var(--primary-soft); }
.theme-pack-item.active { border-color: var(--primary); background: var(--primary-soft); }
.theme-pack-preview { width: 56px; height: 56px; border-radius: 8px; box-shadow: 0 1px 4px rgba(0,0,0,0.12); }
.theme-pack-name { font-size: 11px; color: var(--muted); }

[data-theme="dark"] .quiz-real { border-color: #2a3145; }

/* 线QUIZWRAP：刷题页容器基础布局（9 个 view wrapper） */
.quiz-bank, .quiz-home, .quiz-history-page, .quiz-mastery, .quiz-config, .quiz-quick, .quiz-paper, .quiz-summary { padding: 4px 0; }
.quiz-fb-cost { font-size: 12px; }
[data-theme="dark"] .quiz-fb-cost { color: #9aa4bd; }

/* ================= 线PROVIDERFIX：表单输入撑满 + 长字段跨两列（用户截图反馈 API 地址框被截断） ================= */
.provider-form-grid input, .provider-form-grid select { width: 100%; box-sizing: border-box; min-width: 0; }
.provider-form-grid label:has(#provider-f-url) { grid-column: 1 / -1; }

/* ================= 线KBFIX：资料库文档表修复（用户截图：列表崩坏/溢出截断） ================= */
#kb-doc-list { width: 100% !important; max-width: 100% !important; display: block; overflow-x: auto; }
#kb-doc-list table.kb-doc-table { width: 100%; border-collapse: collapse; table-layout: fixed; font-size: 13px; }
#kb-doc-list table.kb-doc-table th, #kb-doc-list table.kb-doc-table td { padding: 6px 8px; border-bottom: 1px solid var(--border); text-align: left; }
#kb-doc-list table.kb-doc-table th:nth-child(2), #kb-doc-list table.kb-doc-table td:nth-child(2) { width: 56px; text-align: center; }
#kb-doc-list table.kb-doc-table th:nth-child(3), #kb-doc-list table.kb-doc-table td:nth-child(3) { width: 88px; }
#kb-doc-list table.kb-doc-table td:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#kb-file { width: 100%; box-sizing: border-box; }

/* ================= 线KBFIX2：资料库页双栏布局（用户反馈：左列太窄） ================= */
#page-kb { display: grid; grid-template-columns: minmax(400px, 44%) 1fr; gap: 14px; align-items: start; }
#page-kb .page-scroll.page-narrow { max-width: none; }
#page-kb #paper-zone { margin: 0; }
#kb-doc-list table.kb-doc-table th { white-space: nowrap; }
@media (max-width: 1000px) { #page-kb { grid-template-columns: 1fr; } }

/* ================= 线PROVIDERFIX3：成本面板表格不截断（用户截图反馈） ================= */
#cost-rows table, .cost-split-table { max-width: 100%; overflow-x: auto; display: block; }
#cost-rows table th, #cost-rows table td { white-space: nowrap; }

/* ================= 线SETTINGS 阶段 0：设置中心（顶栏⚙️ + 全屏设置页 + 分组卡片） ================= */
/* 顶栏齿轮：与 #btn-theme 同尺寸（icon-btn 语言，34px 紧凑） */
#btn-settings {
  width: 34px;
  height: 34px;
  font-size: 16px;
  border: 1px solid var(--border);
  background: transparent;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
#btn-settings:hover { border-color: var(--primary); background: var(--primary-soft); }
#btn-settings:active { transform: scale(0.94); }

/* 分组说明行（每组一行说明文字） */
.settings-desc { font-size: 12.5px; color: var(--muted); line-height: 1.6; margin: -4px 0 12px; }

/* 分组容器（开关/按钮纵向排布） */
.settings-group { display: flex; flex-direction: column; gap: 6px; }

/* 主题三态按钮组（☀️/🌙/auto，读写 gk_theme） */
.settings-seg { display: flex; gap: 8px; flex-wrap: wrap; }
.settings-seg-btn {
  flex: 1;
  min-width: 96px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #fafbfe;
  font-size: 13px;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
.settings-seg-btn:hover { border-color: var(--primary); background: var(--primary-soft); }
.settings-seg-btn:active { transform: scale(0.97); }
.settings-seg-btn.active {
  background: var(--primary-soft);
  border-color: var(--primary);
  color: var(--primary-dark);
  font-weight: 600;
}

/* 开关行（pill 开关，复用 .autopilot-toggle 语言；与聊天页开关同键） */
.settings-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  user-select: none;
}
.settings-toggle input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 38px;
  height: 20px;
  border-radius: 999px;
  background: #d3d9e6;
  position: relative;
  transition: background var(--t-fast);
  cursor: pointer;
  margin: 0;
  flex: none;
}
.settings-toggle input[type="checkbox"]::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform var(--t-fast);
}
.settings-toggle input[type="checkbox"]:checked { background: linear-gradient(135deg, #50b8c0, #4f6ef7); }
.settings-toggle input[type="checkbox"]:checked::after { transform: translateX(18px); }
.settings-toggle input[type="checkbox"]:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* 旧入口「在设置中心管理」链接（聊天页/错题本/档案页） */
.settings-manage {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}
.settings-manage:hover { color: var(--primary-dark); }

/* 暗色模式 */
[data-theme="dark"] .settings-seg-btn { background: #171c2a; }
[data-theme="dark"] .settings-toggle input[type="checkbox"] { background: #3a4254; }

/* ==========================================================
   线VISUAL6：RikkaHub 视觉深化（批次5 · 身份感 + 手感增量，纯追加不覆盖既有线注释块）
   ① 气泡弹性入场（spring 曲线 + reduced-motion 降级淡入）
   ② AI 气泡身份头（.msg-identity 名师 emoji 头像 + 名字，主色容器）
   ③ 发送按钮圆形 FAB（hover 上浮 / active 按压 / 暗色）
   ④ 打字指示器弹性跳动（.think-dots 升级 spring，不破坏流式思考块）
   ⑤ 点击波纹兜底（.btn/.icon-btn 已有 :active，补 .choice-chip 等高频元素）
   ========================================================== */

/* ---------- ① 气泡弹性入场 ---------- */
@keyframes msgSpring {
  from { opacity: 0; transform: translateY(10px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.msg { animation: msgSpring 0.32s cubic-bezier(0.34,1.56,0.64,1) both; }
/* 尊重系统降动效：弹性降级为纯淡入（无位移/缩放） */
@media (prefers-reduced-motion: reduce) {
  .msg { animation: msgFade 0.25s ease both; }
}
@keyframes msgFade {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ---------- ② AI 气泡身份头（名师头像 + 名字，颜色用主色容器） ---------- */
.msg-identity {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  padding: 3px 11px 3px 4px;
  border-radius: 999px;
  background: var(--acc-soft, var(--primary-soft));
  color: var(--acc, var(--primary-dark));
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  max-width: 100%;
}
.msg-identity-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--acc, var(--primary));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  line-height: 1;
  flex: none;
}
.msg-identity-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
[data-theme="dark"] .msg-identity {
  color: var(--acc, #9db1ff);
  background: var(--acc-soft, rgba(91, 120, 255, 0.16));
}
[data-theme="dark"] .msg-identity-avatar {
  color: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
}

/* ---------- ③ 发送按钮圆形 FAB ---------- */
#btn-send {
  width: 42px;
  height: 42px;
  padding: 0;
  border-radius: 50%;
  font-size: 0; /* 隐藏「发送」文字，仅保留 ➤ 图标 */
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
#btn-send .btn-icon {
  font-size: 18px;
  margin-right: 0;
  vertical-align: middle;
}
#btn-send:hover {
  filter: brightness(1.05);
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 8px 22px rgba(79, 110, 247, 0.44);
}
#btn-send:active { transform: translateY(0) scale(0.9); box-shadow: 0 2px 8px rgba(79, 110, 247, 0.30); }
#btn-send:disabled { transform: none; opacity: 0.72; }
[data-theme="dark"] #btn-send {
  box-shadow: 0 3px 14px rgba(91, 120, 255, 0.36);
}
[data-theme="dark"] #btn-send:hover {
  box-shadow: 0 8px 24px rgba(91, 120, 255, 0.5);
}
/* 窄屏触控目标：与 .icon-btn 同步 48px 正圆（覆盖 ≤768 的 min-height:48px / padding） */
@media (max-width: 768px) {
  #btn-send { width: 48px; height: 48px; min-height: 0; padding: 0; }
}

/* ---------- ④ 打字指示器弹性跳动（升级线CHATUX .think-dots，spring 曲线 + 过冲） ---------- */
.think-dots span {
  animation: thinkBounceElastic 0.9s cubic-bezier(0.34,1.56,0.64,1) infinite;
}
.think-dots span:nth-child(2) { animation-delay: 0.12s; }
.think-dots span:nth-child(3) { animation-delay: 0.24s; }
@keyframes thinkBounceElastic {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.45; }
  45% { transform: translateY(-7px) scale(1.12); opacity: 1; }
}

/* ---------- ⑤ 点击波纹兜底（.btn/.icon-btn 已有 :active，补 chip/tab 类高频元素） ---------- */
.choice-chip:active,
.quiz-subnav-chip:active,
.thread-tab:active,
.msg-tools button:active,
.preset-item:active,
.lb-capsule:active {
  transform: scale(0.95);
}

/* ============ 线CHATOPT：聊天体验优化（原地编辑 / 正文字号 15.5px·1.65 / 已编辑标记） ============ */
.msg .bubble, .msg-identity-name, .mentor-body, .answer-preview { font-size: 15.5px; line-height: 1.65; }

/* 原地编辑态（仅用户气泡）：textarea 回显原文 + 保存/取消按钮（内联最小样式，复用 .msg 结构） */
.msg-edit-input {
  width: 100%;
  min-height: 60px;
  box-sizing: border-box;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: #16233f;
  font-size: inherit;
  line-height: 1.65;
  font-family: inherit;
  resize: vertical;
}
.msg-edit-bar { display: flex; gap: 8px; margin-top: 8px; justify-content: flex-end; }
.msg-edit-btn {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--muted);
  cursor: pointer;
}
.msg-edit-save { background: var(--primary); border-color: var(--primary); color: #fff; }
.msg-edit-save:hover { filter: brightness(1.05); }
.msg-edit-cancel:hover { border-color: var(--primary); color: var(--primary-dark); }
.msg-edited-tag {
  margin-left: 6px;
  font-size: 11px;
  line-height: 1;
  color: inherit;
  opacity: 0.72;
  white-space: nowrap;
}
[data-theme="dark"] .msg-edit-input { background: #1d2334; color: #e6e8f0; }
[data-theme="dark"] .msg-edit-btn { background: #1d2334; color: var(--muted); }
[data-theme="dark"] .msg-edit-save { background: var(--primary); color: #fff; }

/* 窄屏维持既有 15px 正文下限（默认已调至 15.5px，≤768 不放大，保留窄屏适配） */
@media (max-width: 768px) {
  .msg .bubble, .mentor-body, .answer-preview { font-size: 15px; line-height: 1.65; }
}

/* ============ 线UPD + F007 P0 + F009 + #18：版本提示条 ============ */
/* #18: 桌面端不遮挡导航——改为 relative（占位），不覆盖 #chat-header */
.ver-banner {
  position: relative;  /* #18: fixed→relative，不遮挡导航 */
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: linear-gradient(135deg, #4f6ef7, #7c3aed);
  color: #fff;
  font-size: 14px;
  box-shadow: 0 4px 18px rgba(31, 42, 68, 0.35);
}
.ver-banner-text {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
  line-height: 1.4;
}
.ver-banner-btn {
  flex: 0 0 auto;
  border: 0;
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}
.ver-banner-refresh {
  background: #fff;
  color: #4f6ef7;
  font-weight: 600;
}
.ver-banner-refresh:hover { background: #eef1ff; }
.ver-banner-later {
  background: transparent;
  color: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.45);
}
.ver-banner-later:hover { background: rgba(255, 255, 255, 0.12); }

/* 暗色适配 */
[data-theme="dark"] .ver-banner {
  background: linear-gradient(135deg, #3b5bf0, #6d28d9);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.5);
}
[data-theme="dark"] .ver-banner-later {
  color: rgba(255, 255, 255, 0.92);
  border-color: rgba(255, 255, 255, 0.5);
}

/* 手机窄屏：不溢出、按钮换行不挤压 */
@media (max-width: 480px) {
  .ver-banner { flex-wrap: wrap; padding: 9px 12px; font-size: 13px; gap: 8px; }
  .ver-banner-text { flex: 1 1 100%; }
  .ver-banner-btn { padding: 7px 12px; }
}

/* ============ 线F007 P0 + F009 + #18：版本提示条（移动端底部悬浮 / 桌面端 relative 占位） ============ */
/* 桌面端 .ver-banner position:relative 占位（上方规则）；此处 ≤768 移动端悬浮底部 */
@media (max-width: 768px) {
  .ver-banner {
    position: fixed;  /* 移动端仍 fixed 悬浮底部 */
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 9000;            /* 低于导航/弹窗/灯箱，不再遮挡顶部导航 */
    border-radius: 0;
    padding-bottom: env(safe-area-inset-bottom);  /* iPhone 底部安全区不挡 Home 指示条 */
  }
}
/* 线F009：auto-hide 移出 @media（全局规则）——桌面端 translateY(-100%) 向上消失，移动端 translateY(100%) 向下消失 */
.ver-banner.auto-hide {
  transform: translateY(-100%);  /* 桌面端：向上滑出 */
  transition: transform .3s ease;
}
@media (max-width: 768px) {
  .ver-banner.auto-hide {
    transform: translateY(100%);  /* 移动端：向下滑出 */
  }
}

/* ================= 线F008：入口漂移提示条（全空库+非首次 → 温和提示） ================= */
.drift-hint {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 9000;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 10px 16px; padding-bottom: calc(10px + env(safe-area-inset-bottom));
  background: var(--primary); color: #fff; font-size: 13px; line-height: 1.5;
  box-shadow: 0 -2px 12px rgba(0,0,0,.15);
  animation: drift-hint-in .3s ease;
}
@keyframes drift-hint-in { from { transform: translateY(100%); } to { transform: translateY(0); } }
.drift-hint-text { flex: 1; min-width: 200px; }
.drift-hint-btn {
  background: rgba(255,255,255,.2); color: #fff; border: 1px solid rgba(255,255,255,.4);
  border-radius: 8px; padding: 4px 12px; font-size: 12.5px; cursor: pointer;
}
.drift-hint-btn:hover { background: rgba(255,255,255,.3); }
.drift-hint-close {
  background: transparent; color: #fff; border: none; font-size: 16px; cursor: pointer;
  padding: 2px 6px; opacity: .7;
}
.drift-hint-close:hover { opacity: 1; }

/* ================= 线LISTEN2：英语听力专区（资料库 🔊 英语听力 + 聊天朗读按钮，纯追加不覆盖既有规则） ================= */
.listen-controls { display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.listen-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.listen-list { display: flex; flex-direction: column; gap: 8px; }
.listen-row {
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px;
  cursor: pointer; background: var(--panel); transition: border-color var(--t-fast), background var(--t-fast);
}
.listen-row:hover { border-color: var(--primary); background: var(--hover-bg); }
.listen-row-title { font-size: 13.5px; font-weight: 600; color: var(--text); }
.listen-detail { margin-top: 10px; border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.listen-detail-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.listen-detail-title { font-size: 15px; }
.listen-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.listen-rate { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--muted); }
.listen-rate input[type="range"] { accent-color: var(--primary); }
.listen-btn {
  padding: 6px 14px; font-size: 13px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}
.listen-btn:hover { border-color: var(--primary); background: var(--primary-soft); }
.listen-body { font-size: 14px; line-height: 1.7; white-space: pre-wrap; word-break: break-word; color: var(--text); }
.listen-questions { display: flex; flex-direction: column; gap: 10px; margin-top: 10px; }
.listen-q { border-top: 1px dashed var(--border); padding-top: 8px; }
.listen-q-text { font-size: 13.5px; font-weight: 600; margin-bottom: 6px; }
.listen-q-opts { display: flex; flex-direction: column; gap: 6px; }
.listen-opt {
  text-align: left; padding: 7px 10px; font-size: 13px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--panel); color: var(--text); cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast);
}
.listen-opt:hover { border-color: var(--primary); }
.listen-opt-right { background: #e6f6ec; border-color: var(--success); color: #1c7c45; }
.listen-opt-wrong { background: #fdecec; border-color: var(--danger); color: #b4232a; }
.listen-wordtool { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.listen-word-input {
  flex: 1; min-width: 180px; padding: 8px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 13px; background: transparent; color: inherit;
}
.listen-cloze-text { font-size: 14px; line-height: 1.8; color: var(--text); margin-bottom: 8px; }
.listen-dict-input {
  width: 100%; box-sizing: border-box; padding: 8px 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 14px; line-height: 1.6; background: transparent; color: inherit;
  resize: vertical; font-family: inherit;
}
.listen-dict-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.listen-speaking { background: var(--primary); border-color: var(--primary); color: #fff; }

/* 暗色适配（复用现有暗色变量 #1d2334/#232b45/#2a3145/#9db1ff） */
[data-theme="dark"] .listen-row { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .listen-row:hover { border-color: #4f6ef7; background: #232b45; }
[data-theme="dark"] .listen-detail { border-color: #2a3145; }
[data-theme="dark"] .listen-btn { background: #1d2334; border-color: #2a3145; color: #c7cee0; }
[data-theme="dark"] .listen-btn:hover { background: #232b45; border-color: #4f6ef7; }
[data-theme="dark"] .listen-opt { background: #1d2334; border-color: #2a3145; color: #c7cee0; }
[data-theme="dark"] .listen-opt-right { background: #17301f; border-color: #2f6b47; color: #7fd6a4; }
[data-theme="dark"] .listen-opt-wrong { background: #3a2222; border-color: #7a3b3b; color: #ff9a9a; }
[data-theme="dark"] .listen-word-input, [data-theme="dark"] .listen-dict-input { border-color: #2a3145; }

/* 手机窄屏 ≤768px：专区全宽 + 触控按钮 ≥40px */
@media (max-width: 768px) {
  .listen-detail { padding: 10px; }
  .listen-detail-head { flex-direction: column; align-items: flex-start; }
  .listen-actions { width: 100%; }
  .listen-btn { min-height: 40px; padding: 8px 14px; }
  .listen-opt { min-height: 40px; }
  .listen-word-input, .listen-dict-input { min-width: 100%; }
}

/* ================= 模考历史（线BANKREC：批次2 A5 刷题报告卡「📚 模考历史」区） ================= */
.mock-hist-wrap { overflow-x: auto; margin-bottom: 8px; }
.mock-hist-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
  min-width: 420px;
}
.mock-hist-table th,
.mock-hist-table td {
  border: 1px solid var(--border);
  padding: 6px 8px;
  text-align: left;
  vertical-align: top;
}
.mock-hist-table th { background: var(--primary-soft); font-weight: 700; white-space: nowrap; }
.mock-hist-table td { color: var(--text); }
.mock-hist-score { white-space: nowrap; font-weight: 600; }
.mock-hist-time { white-space: nowrap; color: var(--muted); }
.mock-hist-empty { font-size: 12.5px; line-height: 1.6; margin-bottom: 8px; }
#chart-mock-trend {
  margin-top: 4px;
  height: 220px;
  max-width: 100%;
  min-width: 0;
}

/* ============ 线BANKUI：真题库入口 3 tab + 答题卡 + 评分呈现（只追加未碰既有规则） ============ */
.bank-tabs { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.bank-tab {
  padding: 6px 16px;
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.bank-tab:hover { border-color: var(--primary); color: var(--text); }
.bank-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.bank-tip {
  font-size: 12.5px;
  color: var(--muted);
  padding: 8px 12px;
  margin-bottom: 10px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: var(--primary-soft);
  line-height: 1.6;
}
.bank-status { font-size: 13px; color: var(--muted); padding: 12px 0; }
.bank-empty { font-size: 13px; line-height: 1.7; padding: 14px 0; }
.bank-subject-block { margin-bottom: 12px; }
.bank-subject-name { font-size: 13.5px; font-weight: 700; margin-bottom: 6px; color: var(--text); }
.bank-year-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.bank-year-chip {
  padding: 4px 12px;
  font-size: 12.5px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.bank-year-chip:hover { border-color: var(--primary); color: var(--primary); }
.bank-paper-card {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 10px 12px;
  margin-bottom: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
}
.bank-paper-badge {
  flex-shrink: 0;
  font-size: 11.5px;
  color: #b45309;
  background: #fff7e6;
  border: 1px solid #f6d38c;
  border-radius: 999px;
  padding: 1px 8px;
}
.bank-paper-name { flex: 1; min-width: 180px; font-size: 13.5px; line-height: 1.5; }
.bank-back { margin-bottom: 10px; }

/* 答题卡 */
.bank-sheet {
  margin: 12px 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
}
.bank-sheet-title { font-size: 13px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.bank-sheet-group { margin-bottom: 10px; }
.bank-sheet-group-label { font-size: 12px; color: var(--muted); display: block; margin-bottom: 6px; }
.bank-sheet-grid { display: flex; flex-wrap: wrap; gap: 6px; }
.bank-sheet-cell {
  min-width: 34px;
  height: 30px;
  padding: 0 6px;
  font-size: 12.5px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.bank-sheet-cell:hover { border-color: var(--primary); color: var(--primary); }
.bank-sheet-cell.answered {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
  font-weight: 700;
}
.bank-sheet-cell.jump-active { border-color: var(--primary); box-shadow: 0 0 0 2px var(--focus-ring, rgba(91, 120, 255, 0.24)); }

/* 评分呈现（分科小分 + 用时） */
.bank-score-line {
  font-size: 13px;
  color: var(--muted);
  margin-top: 6px;
  padding: 6px 12px;
  border-left: 3px solid var(--primary);
  background: var(--primary-soft);
  border-radius: var(--radius-xs);
  line-height: 1.6;
}

/* 暗色适配 */
[data-theme="dark"] .bank-tab { background: #1d2334; color: var(--muted); border-color: #2a3145; }
[data-theme="dark"] .bank-tab:hover { color: var(--text); border-color: var(--primary); }
[data-theme="dark"] .bank-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }
[data-theme="dark"] .bank-tip { background: #232a45; border-color: #2a3145; color: #9aa4bd; }
[data-theme="dark"] .bank-subject-name { color: var(--text); }
[data-theme="dark"] .bank-year-chip { background: #1d2334; color: var(--text); border-color: #2a3145; }
[data-theme="dark"] .bank-paper-card { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .bank-paper-badge { color: #f6c453; background: #2a2336; border-color: #6b5a1e; }
[data-theme="dark"] .bank-sheet { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .bank-sheet-title { color: var(--text); }
[data-theme="dark"] .bank-sheet-cell { background: #1d2334; color: var(--text); border-color: #2a3145; }
[data-theme="dark"] .bank-sheet-cell.answered { background: #2f9e6e; border-color: #2f9e6e; color: #fff; }
[data-theme="dark"] .bank-score-line { background: #232a45; border-color: #6a8cff; color: #9aa4bd; }

/* ==========================================================
   线BANKFILTER：真题库「分类练」三维筛选（知识点/题型/难度 + 年份/卷型）
   ========================================================== */
.bank-cls-filter {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
  padding: 8px 12px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  background: #fbfcfe;
}
.bank-cls-label {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--muted);
  flex-shrink: 0;
  min-width: 44px;
}
.bank-cls-count { font-size: 12px; color: var(--muted); margin-left: auto; }
.bank-cls-mock-start { font-size: 13px; padding: 4px 12px; background: var(--primary); color: #fff; border: none; border-radius: 8px; cursor: pointer; }
.bank-cls-mock-start:hover { opacity: 0.85; }
.bank-cls-mock-hint { font-size: 12px; color: var(--muted); }
.bank-cls-fig { margin: 8px 0; }
.bank-cls-fig-missing { font-size: 12px; color: #b45309; background: rgba(245, 158, 0, 0.12); border: 1px solid rgba(245, 158, 0, 0.3); border-radius: 8px; padding: 8px 12px; }
[data-theme="dark"] .bank-cls-fig-missing { background: rgba(245, 158, 0, 0.18); color: #f0c36d; border-color: rgba(245, 158, 0, 0.35); }
.bank-cls-marking {
  font-size: 12px;
  color: #b26a00;
  background: #fdf0e0;
  border: 1px solid #f5d9a8;
  border-radius: 8px;
  padding: 2px 8px;
}
.bank-cls-list { display: flex; flex-direction: column; gap: 10px; margin-top: 6px; }
.bank-cls-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  background: #fdfdff;
  box-shadow: var(--shadow-sm);
}
.bank-cls-card-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.bank-cls-answer { margin-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.bank-opt {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
  padding: 8px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font-family: inherit;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: all 0.15s;
}
.bank-opt:hover:not(:disabled) { border-color: var(--primary); background: var(--primary-soft); }
.bank-opt.active { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 2px var(--primary-soft); }
.bank-opt.correct { border-color: #2fa06f; background: #e9f7ef; }
.bank-opt-letter {
  flex-shrink: 0;
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: #fff;
  color: var(--text);
  font-weight: 800;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.bank-opt.active .bank-opt-letter { background: var(--primary); border-color: var(--primary); color: #fff; }
.bank-opt.correct .bank-opt-letter { background: #2fa06f; border-color: #2fa06f; color: #fff; }
.bank-cls-result {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  background: #f8fafc;
}
.bank-cls-verdict { font-weight: 700; margin-bottom: 6px; }
.bank-cls-std, .bank-cls-exp { margin-top: 6px; font-size: 13.5px; line-height: 1.7; }
[data-theme="dark"] .bank-cls-filter { background: #171c2a; }
[data-theme="dark"] .bank-cls-marking { color: #ffb054; background: #3a2e14; border-color: #7a5b1e; }
[data-theme="dark"] .bank-cls-card { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .bank-opt { background: #1d2334; color: var(--text); border-color: #2a3145; }
[data-theme="dark"] .bank-opt.correct { background: #16352a; border-color: #2fa06f; }
[data-theme="dark"] .bank-cls-result { background: #171c2a; }

/* ============ 番茄专注（线TOMATO 2026-08-19，渲染进 #pomodoro-card-body） ============ */
.pomo-clock { text-align: center; }
.pomo-time {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}
.pomo-phase { font-size: 13px; font-weight: 600; margin-top: 2px; }
.pomo-phase.work { color: #e5484d; }
.pomo-phase.break { color: #30a46c; }
.pomo-phase.idle { color: var(--muted); }
.pomo-bar {
  height: 8px;
  border-radius: 8px;
  background: var(--primary-soft);
  overflow: hidden;
  margin: 8px 0 4px;
  border: 1px solid var(--border);
}
.pomo-bar-fill {
  height: 100%;
  border-radius: 8px;
  background: linear-gradient(90deg, #e5484d, #ff6b6b);
  transition: width 0.5s linear;
}
.pomo-actions { display: flex; gap: 8px; justify-content: center; margin-top: 8px; }
.pomo-actions .btn { padding: 6px 18px; }
.pomo-settings {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
}
.pomo-settings label { display: inline-flex; align-items: center; gap: 4px; }
.pomo-settings input {
  width: 52px;
  padding: 3px 6px;
  font-size: 13px;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  outline: none;
}
.pomo-settings input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }
.pomo-stats {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--primary-soft);
  font-size: 13px;
  color: var(--text);
}
.pomo-stat b { color: var(--primary-dark); font-variant-numeric: tabular-nums; }
.pomo-hint { margin-top: 6px; font-size: 12px; text-align: center; }
[data-theme="dark"] .pomo-time { color: #fff; }
[data-theme="dark"] .pomo-stat b { color: #9db1ff; }
[data-theme="dark"] .pomo-stats { background: #212a47; }
[data-theme="dark"] .pomo-settings input { background: #171c2a; color: var(--text); border-color: #2a3145; }

/* ==========================================================
   线TEACHFIRST 拍照先讲知识点（2026-08-19，E2 对标）
   知识点讲解卡：先讲考点 → 卡内「开始解题」走既有讲解链路
   ========================================================== */
.teach-first-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  margin: 10px 0 12px;
  overflow: hidden;
}
.teach-first-card .teach-first-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 13.5px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-soft), #fdf3e3);
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.teach-first-card .teach-first-subject {
  font-size: 12px;
  font-weight: 600;
  color: var(--primary-dark);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 10px;
}
.teach-first-card .teach-first-body {
  padding: 12px 14px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text);
  white-space: pre-wrap;
  word-break: break-word;
}
.teach-first-card .teach-first-md { line-height: 1.75; }
.teach-first-card .teach-first-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 10px 14px;
  border-top: 1px dashed var(--border);
  background: #fafbfe;
}
.teach-first-card .teach-first-go { font-size: 13.5px; }

/* 暗色适配 */
[data-theme="dark"] .teach-first-card { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .teach-first-card .teach-first-head { background: linear-gradient(135deg, #232a45, #2a2336); border-color: #2a3145; color: var(--text); }
[data-theme="dark"] .teach-first-card .teach-first-subject { background: #232b45; color: #9db1ff; border-color: #2a3145; }
[data-theme="dark"] .teach-first-card .teach-first-body { color: var(--text); }
[data-theme="dark"] .teach-first-card .teach-first-actions { background: #161c2c; border-color: #2a3145; }


/* ================= 作文素材库（线ESSAYBANK：资料库页「📇 素材库」） ================= */
.essay-bank-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.essay-bank-chips .choice-chip { padding: 4px 12px; border-radius: 8px; font-size: 13px; }
.essay-bank-actions { display: flex; gap: 8px; margin: 10px 0; flex-wrap: wrap; }
.essay-bank-manual { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; padding: 12px; border: 1px dashed var(--border); border-radius: 8px; background: var(--hover-bg); }
.essay-bank-form-row { display: flex; gap: 8px; }
.essay-bank-list { display: flex; flex-direction: column; gap: 10px; }
.essay-bank-item { padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px; background: var(--card-bg, #fff); }
.essay-bank-quote { font-size: 15px; font-weight: 600; color: var(--primary-dark, #3b4f9e); margin-bottom: 6px; line-height: 1.6; }
.essay-bank-example { font-size: 13.5px; line-height: 1.7; color: var(--text); margin-bottom: 6px; }
.essay-bank-angle { font-size: 12.5px; color: var(--muted); margin-bottom: 6px; }
.essay-bank-source { font-size: 12px; color: var(--muted); opacity: 0.85; }
[data-theme="dark"] .essay-bank-item { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .essay-bank-quote { color: #9db1ff; }
[data-theme="dark"] .essay-bank-manual { background: #161c2c; border-color: #2a3145; }


/* ================= 听力真题数据源 tab + 年份筛选 + 来源行（线HEARUI，追加不碰既有 .listen-*） ================= */
.listen-src-tab { display: flex; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.listen-src-chip { padding: 5px 14px; border-radius: 8px; font-size: 13px; font-weight: 600; border: 1px solid var(--border); background: var(--hover-bg); cursor: pointer; transition: background .15s; }
.listen-src-chip:hover { filter: brightness(1.05); }
.listen-src-chip.active { background: var(--primary, #4f6ef7); color: #fff; border-color: transparent; }
.listen-year-chips { margin-top: 4px; }
.listen-year-badge { background: #e8780a; color: #fff; font-size: 11px; font-weight: 600; }
.listen-src-line { opacity: 0.9; margin-bottom: 4px; }
[data-theme="dark"] .listen-src-chip { background: #232b45; border-color: #2a3145; color: var(--text); }
[data-theme="dark"] .listen-src-chip.active { background: #4f6ef7; color: #fff; border-color: transparent; }
[data-theme="dark"] .listen-year-badge { background: #b35a00; }


/* ================= 公共资料库分区（线LIBCLOUDUI，追加不碰既有规则） ================= */
.lib-cloud-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.lib-cloud-chips .choice-chip { padding: 4px 12px; border-radius: 8px; font-size: 13px; }
.lib-cloud-list { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; }
.lib-cloud-row { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--hover-bg); cursor: pointer; transition: border-color .15s; }
.lib-cloud-row:hover { border-color: var(--primary, #4f6ef7); }
.lib-cloud-row-title { font-size: 15px; font-weight: 600; }
.lib-cloud-sub-badge { background: #2a8a5a; color: #fff; font-size: 11px; font-weight: 600; }
.lib-cloud-meta { margin-top: 3px; opacity: 0.85; }
.lib-cloud-detail { margin-top: 12px; padding: 14px; border: 1px solid var(--border); border-radius: 8px; background: var(--card-bg, #fff); }
.lib-cloud-detail-head { border-bottom: 1px solid var(--border); padding-bottom: 10px; margin-bottom: 10px; }
.lib-cloud-back { margin-bottom: 8px; font-size: 13px; }
.lib-cloud-detail-title { font-size: 17px; font-weight: 700; margin: 4px 0; }
.lib-cloud-detail-meta { opacity: 0.85; }
.lib-cloud-detail-src a, .lib-cloud-fallback a, .lib-cloud-error a { color: var(--primary, #4f6ef7); }
.lib-cloud-body { font-size: 14px; line-height: 1.75; max-height: 60vh; overflow-y: auto; padding-right: 6px; }
.lib-cloud-body h1, .lib-cloud-body h2, .lib-cloud-body h3 { margin: 12px 0 6px; }
.lib-cloud-body p { margin: 6px 0; }
.lib-cloud-body code { background: var(--hover-bg); padding: 1px 4px; border-radius: 8px; font-size: 13px; }
.lib-cloud-body pre { background: var(--hover-bg); padding: 10px; border-radius: 8px; overflow-x: auto; font-size: 13px; }
.lib-cloud-body table { border-collapse: collapse; margin: 8px 0; }
.lib-cloud-body th, .lib-cloud-body td { border: 1px solid var(--border); padding: 4px 8px; }
.lib-cloud-fallback, .lib-cloud-error { padding: 10px; border: 1px dashed var(--border); border-radius: 8px; }
[data-theme="dark"] .lib-cloud-row { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .lib-cloud-detail { background: #1d2334; border-color: #2a3145; }
[data-theme="dark"] .lib-cloud-sub-badge { background: #1e5a3e; }
[data-theme="dark"] .lib-cloud-body code, [data-theme="dark"] .lib-cloud-body pre { background: #161c2c; }

/* 线F002：搜索卡片展开/收起——覆盖 3 行截断 + 展开指示 */
.search-item.expanded .search-item-snippet { display:block; -webkit-line-clamp:unset; overflow:visible; }
.search-item .expand-hint { font-size:12px; color:var(--muted,#9aa4bf); cursor:pointer; padding:2px 0; }
.search-item.expanded .expand-hint::before { content:'▲ 收起'; }
.search-item:not(.expanded) .expand-hint::before { content:'▼ 展开全文'; }
[data-theme="dark"] .search-item .expand-hint { color:#6a7390; }

/* ================= 默写专区（线REC60：默写专区，资料库页「📝 默写 60 篇」，幂等创建） ================= */
.recite-zone { }
.recite-list { display: flex; flex-direction: column; gap: 10px; margin-top: 10px; }
.recite-item { border: 1px solid var(--border); border-radius: 8px; background: var(--card-bg, #fff); overflow: hidden; }
.recite-item-header { display: flex; align-items: center; gap: 10px; padding: 12px 14px; cursor: pointer; user-select: none; flex-wrap: wrap; }
.recite-item-header:hover { background: var(--hover-bg, #f5f6fa); }
.recite-item-title { font-size: 15px; font-weight: 600; color: var(--primary-dark, #3b4f9e); }
.recite-expand { font-size: 12px; color: var(--muted, #9aa4bf); margin-left: auto; }
.recite-item-body { padding: 0 14px 14px; }
.recite-section-label { font-size: 12px; font-weight: 600; color: var(--muted, #9aa4bf); margin: 10px 0 4px; text-transform: uppercase; letter-spacing: 0.5px; }
.recite-text-line { font-size: 14px; line-height: 1.9; margin: 2px 0; }
.recite-err-char { color: #d32f2f; font-weight: 700; text-decoration: underline; text-decoration-style: wavy; text-underline-offset: 2px; cursor: help; }
[data-theme="dark"] .recite-err-char { color: #f44336; }
.recite-translation { font-size: 13.5px; line-height: 1.8; color: var(--text); }
.recite-source { font-size: 13px; color: var(--muted, #9aa4bf); }
.recite-context-q { margin: 6px 0; padding: 8px 10px; background: var(--hover-bg, #f5f6fa); border-radius: 8px; }
.recite-context-q .recite-context-a { display: none; }
.recite-context-q.show-a .recite-context-a { display: inline; }
.recite-blank { display: inline-block; min-width: 60px; border-bottom: 2px dashed var(--muted, #9aa4bf); color: var(--primary, #4f6ef7); cursor: pointer; font-weight: 600; text-align: center; }
.recite-blank:hover { filter: brightness(1.1); }
[data-theme="dark"] .recite-item { background: #1a2035; }
[data-theme="dark"] .recite-item-header:hover { background: #1f2640; }
[data-theme="dark"] .recite-detail { background: #1f2640; }
[data-theme="dark"] .recite-context-q { background: #1f2640; }

/* 线REC60+SM-2：默写检测（遗忘排期） */
.recite-dict-box { margin: 8px 0; padding: 10px; border: 1px solid var(--border, #e0e3eb); border-radius: 8px; background: var(--hover-bg, #f5f6fa); }
[data-theme="dark"] .recite-dict-box { background: #1f2640; border-color: #2a3050; }

/* 线SUBJECTARCHIVE：分科档案选科器+六科分数 */
/* 线SUBJECTARCHIVE⑤：临时换档按钮 */
.temp-tier-row { display: inline-flex; gap: 2px; }
.temp-tier-btn { background: none; border: 1px solid var(--border, #e0e3eb); border-radius: 8px; padding: 2px 4px; font-size: 14px; cursor: pointer; line-height: 1; opacity: 0.5; transition: opacity .15s; }
.temp-tier-btn:hover { opacity: 1; }
.temp-tier-btn.active { opacity: 1; background: var(--primary, #4f6ef7); border-color: var(--primary, #4f6ef7); }
[data-theme="dark"] .temp-tier-btn { border-color: #2a3050; }

.pf-subj-selector { border: 1px solid var(--border, #e0e3eb); border-radius: 8px; padding: 10px; margin-top: 4px; }
[data-theme="dark"] .pf-subj-selector { border-color: #2a3050; background: #1a2035; }
.pf-subj-group { display: flex; flex-direction: column; gap: 4px; margin: 8px 0; }
.pf-subj-locked-row { display: flex; gap: 6px; }
.pf-subj-locked-pill { padding: 4px 12px; border: 1px solid var(--border, #e0e3eb); border-radius: 999px; font-size: 13px; font-weight: 600; color: var(--muted, #888); background: var(--panel, #f5f6fa); }
[data-theme="dark"] .pf-subj-locked-pill { border-color: #2a3050; background: #1a2035; }
/* v5.6.4 选科器卡片式（L114 批 A） */
.pf-subj-cards-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.pf-subj-cards-4 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.pf-subj-card { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 12px 8px; border: 2px solid var(--border, #e0e3eb); border-radius: 8px; cursor: pointer; user-select: none; transition: border-color 0.15s, background 0.15s; background: var(--panel, #f5f6fa); }
.pf-subj-card input { position: absolute; opacity: 0; pointer-events: none; }
.pf-subj-card .pf-card-check { position: absolute; top: 4px; right: 6px; font-size: 14px; opacity: 0; color: var(--primary, #4f6ef7); transition: opacity 0.15s; }
.pf-subj-card .pf-card-name { font-size: 15px; font-weight: 600; color: var(--text, #333); }
.pf-subj-card:has(input:checked) { border-color: var(--primary, #4f6ef7); background: color-mix(in srgb, var(--primary, #4f6ef7) 8%, transparent); }
.pf-subj-card:has(input:checked) .pf-card-check { opacity: 1; }
.pf-subj-card:has(input:checked) .pf-card-name { color: var(--primary, #4f6ef7); }
[data-theme="dark"] .pf-subj-card { border-color: #2a3050; background: #1a2035; }
[data-theme="dark"] .pf-subj-card:has(input:checked) { border-color: #4f6ef7; background: rgba(79,110,247,0.12); }
.pf-subj-scores { display: flex; flex-direction: column; gap: 4px; margin-top: 4px; }
.pf-subj-score-row { display: flex; align-items: center; gap: 6px; padding: 4px 0; }
.pf-subj-name { width: 40px; font-weight: 600; font-size: 13px; }
.pf-subj-score-row input { width: 60px; text-align: center; }
.pf-subj-sep { color: var(--muted, #9aa4bf); }
.pf-subj-full { font-size: 12px; color: var(--muted, #9aa4bf); }
.recite-dict-actions { display: flex; align-items: center; gap: 10px; margin-top: 6px; }
.recite-dict-result { font-size: 13px; font-weight: 600; }
.recite-dict-choices { display: flex; align-items: center; gap: 6px; margin-top: 8px; flex-wrap: wrap; }
.recite-dict-choices[hidden] { display: none; }
.recite-quality { cursor: pointer; }

/* ================= 化方程速查（线CHEMEQU：化方程速查，资料库页「🧪 化方程速查」，分类筛选+速查表） ================= */
.chemequ-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.chemequ-list { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.chemequ-item { border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; background: var(--card-bg, #fff); }
.chemequ-equation { font-size: 16px; font-weight: 700; font-family: 'Times New Roman', 'CMU Serif', serif; color: var(--text); margin-bottom: 6px; letter-spacing: 0.5px; }
.chemequ-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 4px; }
.chemequ-name { font-size: 13.5px; font-weight: 600; color: var(--primary-dark, #3b4f9e); }
.chemequ-type-badge { font-size: 11px; padding: 1px 8px; border-radius: 8px; background: #e3f0ff; color: #1a5a9e; }
.chemequ-category-badge { font-size: 11px; padding: 1px 8px; border-radius: 8px; background: #e8f5e9; color: #2e7d32; }
.chemequ-conditions { font-size: 12.5px; color: var(--muted, #9aa4bf); margin-bottom: 2px; }
.chemequ-notes { font-size: 12.5px; color: var(--text); margin-bottom: 2px; }
.chemequ-tip { font-size: 12.5px; color: #e8780a; margin-top: 2px; }
[data-theme="dark"] .chemequ-item { background: #1a2035; }
[data-theme="dark"] .chemequ-type-badge { background: #1a2a4a; color: #8ab4f8; }
[data-theme="dark"] .chemequ-category-badge { background: #1a3a1a; color: #81c784; }

/* 线CHEMEQU：化学方程式速查 */
.chemequ-zone { margin-top: 16px; }
.chemequ-filter { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.chemequ-chip { padding: 4px 10px; border-radius: 8px; font-size: 13px; cursor: pointer; background: var(--hover-bg, #f0f2f8); border: 1px solid transparent; }
.chemequ-chip.active { background: var(--primary, #4f6ef7); color: #fff; }
.chemequ-card { padding: 10px 12px; border-radius: 8px; background: var(--hover-bg, #f5f6fa); margin-bottom: 6px; }
.chemequ-eq { font-family: 'Courier New', monospace; font-size: 15px; font-weight: 600; margin: 4px 0; }
.chemequ-name { font-size: 13px; color: var(--muted, #6a7390); }
.chemequ-notes { font-size: 12px; margin-top: 4px; }
.chemequ-exam { font-size: 12px; color: var(--primary, #4f6ef7); margin-top: 2px; }
[data-theme="dark"] .chemequ-card { background: #1d2334; }
[data-theme="dark"] .chemequ-chip { background: #1d2334; }

/* ================= 数学二级结论（线MATH：数学二级结论，资料库页「📐 数学二级结论」，10 板块 80 条速查卡） ================= */
.math-conc-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.math-conc-list { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.math-conc-item { border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; background: var(--card-bg, #fff); }
.math-conc-header { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 6px; }
.math-conc-title { font-size: 15px; font-weight: 700; color: var(--primary-dark, #3b4f9e); }
.math-conc-category-badge { font-size: 11px; padding: 1px 8px; border-radius: 8px; background: #ede7f6; color: #5e35b1; }
.math-conc-formula { font-size: 15.5px; font-weight: 700; font-family: 'Times New Roman', 'CMU Serif', serif; color: var(--text); margin-bottom: 4px; letter-spacing: 0.5px; }
.math-conc-condition { font-size: 12.5px; color: var(--muted, #9aa4bf); margin-bottom: 6px; }
.math-conc-details { margin: 4px 0; font-size: 13px; }
.math-conc-details summary { cursor: pointer; color: var(--primary, #4f6ef7); font-size: 12.5px; user-select: none; }
.math-conc-derivation, .math-conc-example { margin: 4px 0 4px 12px; line-height: 1.7; color: var(--text); }
.math-conc-mnemonic { font-size: 13px; color: #e8780a; margin-top: 6px; background: rgba(232, 120, 10, 0.08); border-radius: 8px; padding: 4px 8px; }
[data-theme="dark"] .math-conc-item { background: #1a2035; }
[data-theme="dark"] .math-conc-category-badge { background: #2a2350; color: #b39ddb; }
[data-theme="dark"] .math-conc-mnemonic { background: rgba(232, 120, 10, 0.15); color: #ffab5c; }

/* ================= 英语作文模板（线ESSAYTMPL：英语作文模板，资料库页「✍️ 英语作文模板」，15 类 94 条速查卡） ================= */
.essay-tmpl-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.essay-tmpl-list { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.essay-tmpl-item { border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; background: var(--card-bg, #fff); }
.essay-tmpl-header { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 6px; }
.essay-tmpl-title { font-size: 15px; font-weight: 700; color: var(--primary-dark, #3b4f9e); }
.essay-tmpl-level-badge { font-size: 11px; padding: 1px 8px; border-radius: 8px; }
.essay-tmpl-level-basic { background: #e8f5e9; color: #2e7d32; }
.essay-tmpl-level-intermediate { background: #e3f0ff; color: #1a5a9e; }
.essay-tmpl-level-advanced { background: #fce4ec; color: #c62828; }
.essay-tmpl-category-badge { font-size: 11px; padding: 1px 8px; border-radius: 8px; background: #fff3e0; color: #e65100; }
.essay-tmpl-template { font-size: 14px; line-height: 1.8; color: var(--text); margin-bottom: 6px; font-family: 'Georgia', 'Times New Roman', serif; }
.essay-tmpl-fill { font-size: 12.5px; color: var(--muted, #9aa4bf); margin-bottom: 4px; display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.essay-tmpl-fill-tag { display: inline-block; padding: 0 6px; border-radius: 8px; background: var(--hover-bg, #f5f6fa); color: var(--primary, #4f6ef7); font-size: 12px; }
.essay-tmpl-usage { font-size: 12.5px; color: var(--text); margin-bottom: 4px; }
.essay-tmpl-alts { margin: 4px 0; }
.essay-tmpl-alts summary { cursor: pointer; color: var(--primary, #4f6ef7); font-size: 12.5px; user-select: none; }
.essay-tmpl-alt { font-size: 12.5px; margin: 2px 0 2px 12px; padding: 2px 6px; background: var(--hover-bg, #f5f6fa); border-radius: 8px; }
[data-theme="dark"] .essay-tmpl-item { background: #1a2035; }
[data-theme="dark"] .essay-tmpl-level-basic { background: #1a3a1a; color: #81c784; }
[data-theme="dark"] .essay-tmpl-level-intermediate { background: #1a2a4a; color: #8ab4f8; }
[data-theme="dark"] .essay-tmpl-level-advanced { background: #3a1a2a; color: #f48fb1; }
[data-theme="dark"] .essay-tmpl-category-badge { background: #3a2a10; color: #ffb74d; }
[data-theme="dark"] .essay-tmpl-alt { background: #1f2640; }

/* ================= 英语语法考点（线ENGRAM：英语语法，资料库页「🔤 英语语法」，10 大类 80 条速查卡） ================= */
.eng-gram-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.eng-gram-card { margin-bottom: 10px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--card-bg, #fff); }
[data-theme="dark"] .eng-gram-card { background: #1a2035; }
.eng-gram-list { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.eng-gram-item { border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; background: var(--card-bg, #fff); }
.eng-gram-header { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 6px; }
.eng-gram-title { font-size: 15px; font-weight: 700; color: var(--primary-dark, #3b4f9e); }
.eng-gram-category-badge { font-size: 11px; padding: 1px 8px; border-radius: 8px; background: #e0f2f1; color: #00695c; }
.eng-gram-rule { font-size: 14.5px; font-weight: 700; font-family: 'Georgia', 'Times New Roman', serif; color: var(--text); margin-bottom: 4px; }
.eng-gram-keypoints { font-size: 13px; color: var(--text); margin-bottom: 4px; }
.eng-gram-examples { margin: 4px 0; }
.eng-gram-example { font-size: 13px; margin: 2px 0 2px 10px; padding: 2px 8px; background: var(--hover-bg, #f5f6fa); border-radius: 8px; font-family: 'Georgia', 'Times New Roman', serif; color: var(--text); }
.eng-gram-mistakes { display: flex; flex-wrap: wrap; gap: 4px; align-items: center; margin: 4px 0; }
.eng-gram-mistakes-label { font-size: 12px; color: #d32f2f; font-weight: 600; }
.eng-gram-mistake { font-size: 12px; padding: 1px 6px; border-radius: 8px; background: #fdecea; color: #8e1a1a; }
.eng-gram-tip { font-size: 13px; color: #e8780a; margin-top: 6px; background: rgba(232, 120, 10, 0.08); border-radius: 8px; padding: 4px 8px; }
[data-theme="dark"] .eng-gram-item { background: #1a2035; }
[data-theme="dark"] .eng-gram-category-badge { background: #0a2a28; color: #4db6ac; }
[data-theme="dark"] .eng-gram-example { background: #1f2640; }
[data-theme="dark"] .eng-gram-mistake { background: #3a1414; color: #ef9a9a; }
[data-theme="dark"] .eng-gram-tip { background: rgba(232, 120, 10, 0.15); color: #ffab5c; }

/* 线ENGRAM：英语语法速查 */
.engram-zone { margin-top: 16px; }
.engram-filter { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.engram-chip { padding: 4px 10px; border-radius: 8px; font-size: 13px; cursor: pointer; background: var(--hover-bg, #f0f2f8); border: 1px solid transparent; }
.engram-chip.active { background: var(--primary, #4f6ef7); color: #fff; }
.engram-card { padding: 10px 12px; border-radius: 8px; background: var(--hover-bg, #f5f6fa); margin-bottom: 6px; }
.engram-rule { font-family: 'Courier New', monospace; font-size: 14px; font-weight: 600; margin: 4px 0; }
.engram-example { font-size: 13px; margin: 2px 0; padding-left: 12px; }
.engram-mistake { font-size: 12px; color: #e74c3c; margin: 2px 0; padding-left: 12px; }
.engram-exam { font-size: 12px; color: var(--primary, #4f6ef7); margin-top: 4px; }
[data-theme="dark"] .engram-card { background: #1d2334; }
[data-theme="dark"] .engram-chip { background: #1d2334; }

/* 线作文批改：闭环 UI */
.essay-grade-zone { margin-top: 16px; }
.essay-input-area { display: flex; flex-direction: column; gap: 8px; }
.essay-textarea { width: 100%; min-height: 200px; border-radius: 8px; padding: 12px; }
.essay-type-select { padding: 4px 8px; border-radius: 8px; }
.essay-dim-radar { display: flex; gap: 12px; margin: 8px 0; }
.essay-dim-bar { flex: 1; height: 8px; border-radius: 8px; background: var(--hover-bg, #e8eaf0); position: relative; }
.essay-dim-fill { height: 100%; border-radius: 8px; background: var(--primary, #4f6ef7); }
.essay-sentence { margin: 4px 0; padding: 4px 8px; border-radius: 8px; cursor: pointer; }
.essay-sentence.has-error { background: rgba(231,76,60,0.08); }
.essay-error-tag { display: none; margin-top: 4px; font-size: 12px; color: #e74c3c; }
.essay-highlight-tag { display: none; margin-top: 4px; font-size: 12px; color: #1f8a57; background: rgba(48,164,108,0.08); border-radius: 8px; padding: 2px 6px; }
.essay-sentence.show-error .essay-error-tag { display: block; }
.essay-sentence.show-error .essay-highlight-tag { display: block; }
.essay-chart { margin: 8px 0; }
[data-theme="dark"] .essay-textarea { background: #1d2334; color: #e0e0e0; }

/* ============ 线v6.0⑥：桌面右栏（≥769px 显示，移动端隐藏） ============ */
#right-sidebar {
  display: none;  /* 移动端默认隐藏 */
}
@media (min-width: 769px) {
  #app { display: flex; flex-direction: column; }
  #pages { flex: 1; min-width: 0; }
  #app > #pages { margin-right: 0; }
  /* 右栏：固定在右侧，不随页面滚动 */
  #right-sidebar {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 280px;
    flex-shrink: 0;
    position: fixed;
    top: 52px;  /* tab-nav 高度下方 */
    right: 0;
    bottom: 0;
    overflow-y: auto;
    padding: 10px;
    background: var(--panel);
    border-left: 1px solid var(--border);
    z-index: 100;
  }
  /* 主内容区右移留出右栏空间 */
  #pages { margin-right: 280px; }
}
@media (min-width: 769px) and (max-width: 1024px) {
  #right-sidebar { width: 220px; }
  #pages { margin-right: 220px; }
}

/* v5.6.4 #2 右栏浮动把手（L134① 重做：参数写死，照抄执行） */
.rs-toggle-handle {
  display: flex; align-items: center; justify-content: center;
  position: fixed; right: 0; top: 50%; transform: translateY(-50%);
  width: 20px; height: 36px; border: none; border-radius: 8px 0 0 8px;
  background: var(--panel, #fff); color: var(--primary, #4f6ef7);
  font-size: 12px; cursor: pointer; z-index: 200;
  border-left: 1px solid var(--border, #e0e3eb);
  transition: background 0.15s ease;
}
.rs-toggle-handle:hover { background: var(--bg-soft, #f0f2f8); }
[data-theme="dark"] .rs-toggle-handle { background: var(--panel, #1a2035); border-left-color: var(--border, #2a3050); color: var(--primary, #6b8aff); }
[data-theme="dark"] .rs-toggle-handle:hover { background: #232a45; }
/* 收起后右栏完全消失（画面干净） */
#right-sidebar:not(.rs-open) { display: none; }
@media (max-width: 768px) {
  /* 移动端右栏：收起时 flex 但 translateX 隐藏 */
  #right-sidebar:not(.rs-open) { display: flex; transform: translateX(100%); }
  /* 移动端右栏：固定浮层，默认 translateX(100%) 隐藏 */
  #right-sidebar {
    display: flex; flex-direction: column; gap: 8px;
    position: fixed; top: 52px; right: 0; bottom: 0;
    width: 260px; padding: 10px; overflow-y: auto;
    background: var(--panel, #fff); border-left: 1px solid var(--border, #e0e3eb);
    z-index: 199; transform: translateX(100%); transition: transform 0.25s ease;
  }
  #right-sidebar.rs-open { transform: translateX(0); }
}

.rs-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}
.rs-title {
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--primary-dark);
}
.rs-body { font-size: 12px; line-height: 1.5; color: var(--text); }
.rs-body .muted { color: var(--muted); }
[data-theme="dark"] #right-sidebar { background: #14181f; border-left-color: var(--border); }

/* ============ 线F016#9：资料库专区默认折叠（移动端首屏减压） ============ */
#page-kb .panel-card .card-title,
#page-kb .record-card .side-title { cursor: pointer; user-select: none; }
#page-kb .panel-card .card-title::after,
#page-kb .record-card .side-title::after { content: ' ▸'; float: right; font-weight: 400; color: var(--muted); transition: transform 0.2s; }
#page-kb .panel-card.kb-expanded .card-title::after,
#page-kb .record-card.kb-expanded .side-title::after { content: ' ▾'; }
#page-kb .panel-card:not(.kb-expanded):not(:first-of-type) > *:not(.card-title),
#page-kb .record-card:not(.kb-expanded) > *:not(.side-title) { display: none; }

/* ================= 线BGUPLOAD：自定义背景上传层 ================= */
#custom-bg-layer { position: fixed; inset: 0; z-index: 0; background-size: cover; background-position: center; background-repeat: no-repeat; }
#custom-bg-layer::after { content: ''; position: absolute; inset: 0; opacity: 1; transition: opacity 0.3s; pointer-events: none; }
/* v5.6.4 线BGUPLOAD 双模式遮罩：浅色=白色遮罩55%（F025-1增强，原45%对高亮图不够），深色=深色遮罩42%，随主题切换 */
:root:not([data-theme="dark"]) #custom-bg-layer::after { background: rgba(255, 255, 255, 0.55); }
[data-theme="dark"] #custom-bg-layer::after { background: rgba(8, 10, 22, 0.42); }
/* v5.6.4 背景模糊开关（默认关，.bg-blur 类启用） */
#custom-bg-layer.bg-blur::before { content: ''; position: absolute; inset: 0; backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); pointer-events: none; }
#app { position: relative; z-index: 1; }
.settings-bg-upload { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 10px; }
.settings-theme-gallery-link { margin-top: 8px; }

/* ================= 线SVG #43：12 款 SVG 装饰皮肤层 + 设置中心缩略图选择器 =================
 * 装饰层：fixed 全屏、z-index:-1（paint 在 body 背景之上、内容之下）、pointer-events:none 不挡交互；
 * 与 #custom-bg-layer（自定义背景，z-index:0）独立——用户上传背景时背景层在上，SVG 层在下。
 */
#svg-theme-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.5;
  transition: opacity 0.3s, background-image 0.3s;
}
[data-theme="dark"] #svg-theme-layer { opacity: 0.35; }

/* 设置中心：SVG 皮肤选择器（网格 + 缩略图 + 选中态） */
.settings-svg-theme { margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--border); }
.settings-svg-theme-title { font-size: 13px; font-weight: 600; margin-bottom: 8px; color: var(--text); }
.svg-theme-gallery { margin-top: 4px; }
.svg-theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(78px, 1fr));
  gap: 8px;
}
.svg-theme-thumb {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-color: var(--card-bg);
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  transition: border-color var(--t), box-shadow var(--t), transform var(--t);
}
.svg-theme-thumb:hover { border-color: var(--primary); transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.svg-theme-thumb.active { border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus-ring); }
.svg-theme-thumb .svg-theme-name {
  width: 100%;
  font-size: 11px;
  line-height: 1.2;
  text-align: center;
  padding: 3px 2px;
  background: linear-gradient(to top, rgba(0,0,0,0.55), rgba(0,0,0,0));
  color: #fff;
  pointer-events: none;
}
.svg-theme-thumb .svg-theme-thumb-off {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--muted);
  background: var(--card-bg);
  pointer-events: none;
}

/* 线STEPGRADE：手写步骤批改结果卡 */
.step-grade-card { margin-top: 8px; }
.step-grade-btn { font-size: 13px; }
.step-list { margin: 6px 0; }
.step-item { padding: 4px 8px; margin: 2px 0; border-radius: 8px; font-size: 13px; border-left: 3px solid transparent; }
.step-item.step-ok { border-left-color: #2ecc71; background: rgba(46,204,113,0.06); }
.step-item.step-err { border-left-color: #e74c3c; background: rgba(231,76,60,0.06); }
.step-item.step-warn { border-left-color: #f39c12; background: rgba(243,156,18,0.06); }
.step-icon { font-size: 14px; }
.step-num { font-weight: 600; margin-right: 4px; }
.step-text { color: var(--text,#333); }
.step-dim { font-size: 11px; color: #888; margin-left: 8px; }
.step-note { display: block; margin-top: 2px; font-size: 12px; color: #e74c3c; }

/* 线CSS补缺：作文范文框 + 考试复盘失误行 */
.essay-model-box { background: var(--hover-bg,#e8eaf0); border-radius: 8px; padding: 12px; margin-top: 8px; }
.essay-model-text { white-space: pre-wrap; }
.exr-mistakes { font-size: 12px; color: var(--muted,#888); margin-top: 4px; }

/* ================= 线MKCOLLAPSE：错题本收回/展开（记录中心长页防滚，2026-08-23 用户加急） ================= */
.mk-title-row { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.mk-title-row .card-title { margin: 0; }
.mk-collapse-btn { flex-shrink: 0; opacity: 0.85; }
.mk-collapse-btn:hover { opacity: 1; }
.mk-collapsed-sum { margin: 4px 0 2px; padding: 10px 14px; border: 1px dashed var(--border, #e0e3eb); border-radius: 8px; color: var(--muted, #888); font-size: 13px; background: var(--card-bg, #fff); }
.mk-collapsed-sum strong { color: var(--text, #333); }