/* ========================================
   Material You 色板（M3）
   ======================================== */
:root {
  --primary: #6750A4;
  --on-primary: #FFFFFF;
  --primary-container: #EADDFF;
  --on-primary-container: #21005D;

  --secondary: #625B71;
  --secondary-container: #E8DEF8;

  --tertiary: #7D5260;
  --tertiary-container: #FFD8E4;

  --surface: #FEF7FF;
  --surface-container-lowest: #FFFFFF;
  --surface-container-low: #F7F2FA;
  --surface-container: #F3EDF7;
  --surface-container-high: #ECE6F0;
  --surface-container-highest: #E6E0E9;

  --on-surface: #1C1B1F;
  --on-surface-variant: #49454F;
  --outline: #79747E;
  --outline-variant: #CAC4D0;

  --error: #B3261E;
  --on-error: #FFFFFF;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 2px 4px rgba(0,0,0,0.05), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 8px rgba(0,0,0,0.06), 0 12px 24px rgba(0,0,0,0.10);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 28px;
  --radius-full: 999px;

  --transition: 200ms cubic-bezier(0.2, 0, 0, 1);
}

/* 暗色由 theme.js 把偏好(auto/light/dark)解析成 <html data-theme="dark|light">，
   故这里只需定义 dark 覆盖；auto 跟随系统的逻辑在 JS 里 matchMedia 处理。 */

/* ========================================
   基础
   ======================================== */
* { box-sizing: border-box; }

/* hidden 属性优先于任何 display 规则（修复书签面板/PDF 按钮的隐藏） */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--surface);
  color: var(--on-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

button { font-family: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; font-weight: 500; letter-spacing: -0.01em; }

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 8px;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  color: var(--on-surface);
  border-radius: var(--radius-full);
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition);
}
.icon-btn:hover { background: var(--surface-container-high); }

/* 统一线性图标（Phosphor 内联 SVG，fill:currentColor，尺寸由 data-icon-size / size 决定） */
.nbi { display: block; flex: none; }
.ic { display: inline-flex; align-items: center; justify-content: center; line-height: 0; }

/* ========================================
   首页（NotebookLM 风格）
   ======================================== */
body.home {
  min-height: 100vh;
  background: var(--surface-container-low);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 40px;
  max-width: 1360px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
  color: inherit;
}
.brand-logo {
  height: 28px;
  width: auto;
  display: block;
  transition: filter 260ms ease;
}
/* 兜底：ink.js 没跑（非首页、或取样失败）时按主题反白 */

/* ---- 与背景反着来的墨色（首页字标 + 「My notebooks」标题）----
   data-ink 由 assets/ink.js 按背景实际亮度写：light = 背景暗，上白墨；
   dark = 背景亮，字标回到原本的藏青、标题压成近黑。再补一圈反色光晕，
   让它在花哨背景上也能立住（为什么不用 mix-blend-mode，见 ink.js 抬头）。 */
/* 光晕分两层：贴边一层实的负责勾轮廓（背景局部反过来时靠它兜底），
   外面一层散的负责把字从花背景里托出来。 */
:root[data-ink="light"] .brand-logo {
  filter: brightness(0) invert(1) drop-shadow(0 1px 2px rgba(0, 0, 0, .7)) drop-shadow(0 2px 10px rgba(0, 0, 0, .55));
}
:root[data-ink="dark"] .brand-logo {
  filter: drop-shadow(0 1px 2px rgba(255, 255, 255, .85)) drop-shadow(0 2px 10px rgba(255, 255, 255, .6));
}
:root[data-ink="light"] .section-title {
  color: #fff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, .55), 0 2px 18px rgba(0, 0, 0, .45);
}
:root[data-ink="dark"] .section-title {
  color: #14111c;
  text-shadow: 0 1px 3px rgba(255, 255, 255, .7), 0 2px 18px rgba(255, 255, 255, .5);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  justify-content: flex-end;
}

.search-wrap {
  position: relative;
  width: 100%;
  max-width: 420px;
}
.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--on-surface-variant);
  line-height: 0;
  pointer-events: none;
}
#search {
  width: 100%;
  padding: 11px 18px 11px 42px;
  border-radius: var(--radius-full);
  border: 1px solid var(--outline-variant);
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
#search:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent); }

.ghost-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition);
}
.ghost-btn:hover { background: var(--surface-container-high); }

/* 顶栏胶囊按钮（AI / Create） */
.pill-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition), border-color var(--transition), filter var(--transition);
}
.pill-btn:hover { background: var(--surface-container-high); }
.pill-btn .pill-label { line-height: 1; }
.pill-btn .pill-caret { margin-left: -2px; opacity: .65; }
.pill-primary {
  background: var(--primary);
  color: var(--on-primary);
  border-color: transparent;
}
.pill-primary:hover { background: var(--primary); filter: brightness(1.06); }

/* Create 下拉菜单 */
.create-wrap { position: relative; flex-shrink: 0; }
.create-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 300px;
  padding: 8px;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 60;
  animation: settings-pop 140ms ease-out;
  transform-origin: top right;
}
.cm-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px 12px;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--on-surface);
  text-align: left;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition);
}
.cm-item:hover { background: var(--surface-container-highest); }
.cm-ic {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--primary-container);
  color: var(--on-primary-container);
}
.cm-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.cm-text b { font-size: 14px; font-weight: 600; }
.cm-text em { font-size: 12px; font-style: normal; color: var(--on-surface-variant); }

/* 分类标签 .tab（词典页的释义 / 例句切换在用） */
.tab {
  padding: 7px 16px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface-variant);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
}
.tab:hover { background: var(--surface-container-high); color: var(--on-surface); }
.tab.active { background: var(--on-surface); color: var(--surface); }
/* 窄屏分类菜单（首页 Dock 上的一个瓦片，见 app.js）。默认不显示，首页窄屏由 premium.css 打开。 */
.cats-wrap { position: relative; display: none; flex: none; }
.cats-btn { gap: 7px; }
.cats-now { font-size: 13px; font-weight: 600; letter-spacing: -0.01em; }
.cats-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  width: 200px;
  padding: 8px;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 60;
  animation: settings-pop 140ms ease-out;
  transform-origin: top left;
}
.cat-item {
  display: flex;
  align-items: center;
  gap: 11px;
  width: 100%;
  padding: 11px 12px;
  border: none;
  border-radius: 11px;
  background: transparent;
  color: var(--on-surface);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
}
.cat-item:hover { background: var(--surface-container-highest); }
.cat-name { flex: 1; text-align: left; }
.cat-check { opacity: 0; }
.cat-item.on { color: var(--primary); }
.cat-item.on .cat-check { opacity: 1; }

main {
  max-width: 1360px;
  margin: 0 auto;
  padding: 8px 40px 72px;
}

.section-title {
  transition: color 260ms ease, text-shadow 260ms ease;
  font-size: 22px;
  font-weight: 600;
  color: var(--on-surface);
  letter-spacing: -0.01em;
  margin: 28px 4px 18px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}

/* ---- 时间视图（Time Tab）----
   分组只靠 CSS order 排（DOM 顺序不动，见 app.js layoutTimeline），
   分组标题是同一个网格里的整行元素。 */
.time-head {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0 -4px;
}
.card-grid:not(.by-time) .time-head { display: none; }
.time-head b {
  font-size: 13.5px;
  font-weight: 650;
  letter-spacing: .01em;
  color: var(--on-surface);
}
.time-head em {
  font-style: normal;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  padding: 2px 8px;
  border-radius: 999px;
  color: var(--on-surface-variant);
  background: color-mix(in srgb, var(--on-surface) 8%, transparent);
}
.time-head i {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--outline-variant) 90%, transparent), transparent);
}
/* 分组标题跟「My notebooks」一样直接压在背景图上，只能跟着 data-ink 走反色，
   否则背景一暗（或一亮）这行字就糊在里面看不见了。ink.js 的说明见 style.css 上方。 */
:root[data-ink="light"] .time-head b {
  color: #fff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, .55), 0 2px 14px rgba(0, 0, 0, .45);
}
:root[data-ink="light"] .time-head em {
  color: rgba(255, 255, 255, .82);
  background: rgba(0, 0, 0, .28);
  backdrop-filter: blur(6px);
}
:root[data-ink="light"] .time-head i {
  background: linear-gradient(90deg, rgba(255, 255, 255, .45), transparent);
}
:root[data-ink="dark"] .time-head b {
  color: #14111c;
  text-shadow: 0 1px 3px rgba(255, 255, 255, .7), 0 2px 14px rgba(255, 255, 255, .5);
}
:root[data-ink="dark"] .time-head em {
  color: rgba(20, 17, 28, .9);
  background: rgba(255, 255, 255, .45);
  backdrop-filter: blur(6px);
}
:root[data-ink="dark"] .time-head i {
  background: linear-gradient(90deg, rgba(20, 17, 28, .35), transparent);
}

/* NotebookLM 卡片 */
.nb-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 188px;
  padding: 20px;
  border-radius: 20px;
  background: var(--surface-container);
  background: color-mix(in srgb, var(--accent, var(--primary)) 14%, var(--surface-container-lowest));
  border: 1px solid color-mix(in srgb, var(--accent, var(--primary)) 22%, transparent);
  color: var(--on-surface);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.nb-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.nb-card-icon {
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Segoe UI Symbol", sans-serif;
  font-size: 34px;
  line-height: 1;
  margin-bottom: auto;
}

.nb-card-body { margin-top: 16px; }

.nb-card-subject {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--accent, var(--primary)) 78%, var(--on-surface));
  margin-bottom: 6px;
}

.nb-card-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 两行封顶，但**不要**省略号：line-clamp 的「…」是浏览器自己画的，颜色取自被截断
   那行最后一个 inline 元素（也就是 .fc 分片），所以简介折起来时它会孤零零留在卡片
   右下角，而且只有超过两行的卡片才有 —— 就是那三个点。改成 max-height 硬裁，
   既保住两行的版式，也不会冒出省略号。 */
.nb-card-meta {
  font-size: 13px;
  color: var(--on-surface-variant);
  margin: 0;
  line-height: 1.5;
  display: block;
  max-height: 3em;          /* 2 行 × line-height 1.5 */
  overflow: hidden;
}

/* ---- 简介的折叠文字（仅课程网格里的卡片）----
   平时简介是折起来的：字还占着位置，所以网格不会因为悬停而跳动，
   但看不见，卡片就清爽。鼠标移上去才一片片翻下来，移开再折回去。 */
.card-grid .nb-card-meta {
  position: relative;
  perspective: 320px;
}
.card-grid .nb-card-meta .fc {
  display: inline-block;
  color: var(--on-surface-variant);
  transform-origin: 50% 0;
  transform: rotateX(-96deg);
  opacity: 0;
  will-change: transform;
  transition: transform 300ms cubic-bezier(.22, .78, .28, 1), opacity 180ms ease;
}
.card-grid .nb-card-meta .fw { display: inline-block; width: .3em; }
.card-grid .nb-card:hover .nb-card-meta .fc,
.card-grid .nb-card:focus-within .nb-card-meta .fc {
  transform: none;
  opacity: 1;
  /* 只在展开时排队，折回去是齐刷刷一下，不拖泥带水 */
  transition-delay: calc(var(--i, 0) * 13ms);
}
@media (prefers-reduced-motion: reduce) {
  .card-grid .nb-card-meta .fc { transform: none; opacity: 1; transition: none; }
}
/* 触屏没法悬停，直接把简介显示出来 */
@media (hover: none) {
  .card-grid .nb-card-meta .fc { transform: none; opacity: 1; }
}
/* 页面设置里把「课程简介小字」关掉：整行不渲染，也就不占那两行高度。
   要盖住上面所有 hover / 触屏 / reduced-motion 的分支，所以放在最后。 */
:root.no-card-desc .nb-card-meta { display: none !important; }

.nb-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  font-size: 12px;
  color: var(--on-surface-variant);
}
.nb-progress-bar {
  flex: 1;
  height: 4px;
  background: color-mix(in srgb, var(--on-surface) 14%, transparent);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.nb-progress-bar > i {
  display: block;
  height: 100%;
  background: var(--accent, var(--primary));
  border-radius: var(--radius-full);
}

.empty-state {
  padding: 48px 0;
  text-align: center;
  color: var(--on-surface-variant);
  font-size: 14px;
}

.create-btn {
  flex-shrink: 0;
  padding: 9px 18px;
  border: none;
  border-radius: var(--radius-full);
  background: var(--primary-container);
  color: var(--on-primary-container);
  font-size: 14px;
  font-weight: 600;
  transition: filter var(--transition), box-shadow var(--transition);
}
.create-btn:hover { filter: brightness(0.97); box-shadow: var(--shadow-sm); }

/* 卡片上的删除按钮（仅动态课程，hover 显示） */
/* 「更多选项」手柄：在拖动手柄左边，同样只在悬停右上角区域时才亮 */
.nb-more {
  position: absolute;
  top: 10px;
  right: 46px;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--on-surface) 9%, transparent);
  color: var(--on-surface-variant);
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  z-index: 2;
  cursor: pointer;
  transition: opacity var(--transition), background-color var(--transition), color var(--transition);
}
.nb-card:hover .nb-more { opacity: 1; }
.nb-more:hover { background: var(--primary); color: var(--on-primary, #fff); }

/* 拖拽排序手柄（主网格卡片右上角） */
.nb-drag {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--on-surface) 9%, transparent);
  color: var(--on-surface-variant);
  font-size: 14px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  opacity: 0;
  z-index: 2;
  touch-action: none;          /* 触屏：手柄上不滚动页面，交给拖拽 */
  transition: opacity var(--transition), background-color var(--transition);
}
.nb-card:hover .nb-drag { opacity: 1; }
.nb-drag:hover { background: var(--surface-container-highest); color: var(--on-surface); }
.nb-drag:active { cursor: grabbing; }

/* 拖拽中：被拖卡片留下的占位 + 跟随指针的浮层 */
.nb-card-placeholder {
  opacity: .28;
  filter: grayscale(.3);
}
.nb-card-ghost {
  box-shadow: var(--shadow-lg);
  transform: scale(1.04) rotate(1.5deg);
  transition: none;   /* 跟手的拖影不能有过渡，否则一出现就从原尺寸慢慢「长」出倾斜 */
  opacity: .96;
  cursor: grabbing;
}
.nb-card-ghost .nb-drag,
.nb-card-ghost .nb-more { display: none; }
body.sorting { user-select: none; cursor: grabbing; }

/* 创建课程弹窗 */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  /* 必须高于高级界面里脱离出来的设置菜单（.dock-menu-detached 是 130），
     否则从设置里点开的弹窗会被菜单压在下面 */
  z-index: 200;
  padding: 20px;
  animation: fadeIn 150ms ease-out;
}
.modal {
  background: var(--surface-container-high);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 440px;
  max-width: 100%;
  box-shadow: var(--shadow-lg);
}
.modal h3 { font-size: 18px; margin-bottom: 18px; }

/* ---------- 课程「更多选项」弹窗 ---------- */
.co-modal { width: 460px; max-height: calc(100dvh - 60px); overflow: auto; scrollbar-width: thin; }
.co-modal textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md, 10px);
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font: inherit;
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
}
.co-modal textarea:focus { border-color: var(--primary); outline: none; }
.co-modal .field > .seg { margin-top: 2px; }

.co-cover { display: flex; align-items: center; gap: 12px; }
.co-cover img {
  width: 132px; height: 74px;
  object-fit: cover;
  border-radius: 10px;
  background: var(--surface-container-highest);
  border: 1px solid var(--outline-variant);
}
.co-cover img.noimg { object-fit: contain; opacity: .35; }
.co-cover-acts { display: grid; gap: 6px; }

.co-icon-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.co-icon-now {
  display: grid; place-items: center;
  width: 42px; height: 42px;
  flex: none;
  border-radius: 11px;
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Segoe UI Symbol", sans-serif;
  font-size: 22px;
  line-height: 1;
}
.co-icon-now img { width: 30px; height: 30px; object-fit: contain; }

/* emoji 选择区：固定高度可滚动，不然 60 个表情把弹窗撑爆 */
.co-emoji {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 3px;
  max-height: 132px;
  overflow-y: auto;
  padding: 6px;
  border: 1px solid var(--outline-variant);
  border-radius: 10px;
  background: var(--surface-container-lowest);
  scrollbar-width: thin;
}
.co-em {
  aspect-ratio: 1;
  border: none;
  border-radius: 7px;
  background: transparent;
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Segoe UI Symbol", sans-serif;
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition);
}
.co-em:hover { background: var(--surface-container-highest); transform: scale(1.15); }
.co-em.on { background: color-mix(in srgb, var(--primary) 24%, transparent); box-shadow: inset 0 0 0 1.5px var(--primary); }

.co-actions { display: flex; align-items: center; gap: 8px; margin-top: 18px; }
.co-spacer { flex: 1; }
.btn-soft, .btn-ghost, .btn-primary, .btn-danger {
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}
.btn-soft {
  padding: 6px 12px;
  background: var(--surface-container-highest);
  color: var(--on-surface);
  border-color: var(--outline-variant);
}
.btn-soft:hover { border-color: var(--primary); color: var(--primary); }
.btn-soft:disabled { opacity: .45; cursor: not-allowed; }
.btn-ghost { background: transparent; color: var(--on-surface-variant); }
.btn-ghost:hover { background: var(--surface-container-highest); color: var(--on-surface); }
.btn-primary { background: var(--primary); color: var(--on-primary, #fff); }
.btn-primary:hover { filter: brightness(1.07); }
.btn-primary:disabled { opacity: .6; cursor: progress; }
.btn-danger { background: transparent; color: var(--error); border-color: color-mix(in srgb, var(--error) 40%, transparent); }
.btn-danger:hover { background: var(--error); color: var(--on-error, #fff); }

/* ---------- 图片裁剪弹窗 ---------- */
.crop-overlay { z-index: 260; }          /* 压在课程选项弹窗之上 */
.crop-modal { width: auto; max-width: calc(100vw - 40px); }
.crop-tip { margin: -8px 0 14px; font-size: 11.5px; color: var(--on-surface-variant); }
.crop-stage {
  position: relative;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  background: var(--surface-container-highest);
  box-shadow: inset 0 0 0 1px var(--outline-variant);
}
.crop-canvas { display: block; cursor: grab; touch-action: none; }
.crop-canvas.grabbing { cursor: grabbing; }
/* 取景框：中间透出、四周压暗，让人一眼知道哪块会被留下 */
.crop-frame {
  position: absolute; inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .85), inset 0 0 0 3px rgba(0, 0, 0, .25);
  border-radius: 12px;
}
.crop-frame.is-round { border-radius: 50%; box-shadow: inset 0 0 0 2px rgba(255,255,255,.9), 0 0 0 9999px rgba(0,0,0,.42); }
.crop-zoom { display: flex; align-items: center; gap: 9px; margin-top: 14px; color: var(--on-surface-variant); }
.crop-range {
  flex: 1; min-width: 0; height: 4px;
  -webkit-appearance: none; appearance: none;
  border-radius: 999px;
  background: color-mix(in srgb, var(--on-surface) 16%, transparent);
  cursor: pointer;
}
.crop-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--primary); cursor: pointer;
}
.crop-range::-moz-range-thumb {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--primary); cursor: pointer;
}

/* ---------- 说明文档弹窗 ---------- */
.doc-modal { width: 620px; max-height: calc(100dvh - 60px); display: flex; flex-direction: column; }
.doc-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.doc-head h3 { display: flex; align-items: center; gap: 8px; margin: 0; flex: 1; }
.doc-body { overflow-y: auto; scrollbar-width: thin; padding-right: 4px; }
.doc-sec + .doc-sec { margin-top: 18px; padding-top: 18px; border-top: 1px solid color-mix(in srgb, var(--outline-variant) 60%, transparent); }
.doc-sec h4 {
  display: flex; align-items: center; gap: 7px;
  margin: 0 0 8px;
  font-size: 13.5px; font-weight: 700;
  color: var(--primary);
}
.doc-text { font-size: 13px; line-height: 1.75; color: var(--on-surface-variant); }
.doc-text b { color: var(--on-surface); font-weight: 600; }
.doc-text ul { margin: 6px 0 0; padding-left: 18px; }
.doc-text li + li { margin-top: 5px; }

/* ---------- 登录日志弹窗 ---------- */
.lg-modal { width: 660px; }
.lg-loading { font-size: 13px; color: var(--on-surface-variant); padding: 18px 2px; }
.lg-scope { margin: -8px 0 14px; font-size: 11.5px; line-height: 1.5; color: var(--on-surface-variant); }
.lg-wrap { max-height: 46vh; overflow: auto; scrollbar-width: thin; border: 1px solid var(--outline-variant); border-radius: 10px; }
.lg-table { width: 100%; border-collapse: collapse; font-size: 12.5px; min-width: 520px; }
.lg-table th, .lg-table td { padding: 9px 12px; text-align: left; white-space: nowrap; }
.lg-table thead th {
  position: sticky; top: 0;
  background: var(--surface-container-highest);
  color: var(--on-surface-variant);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: .03em;
}
.lg-table tbody tr + tr { border-top: 1px solid color-mix(in srgb, var(--outline-variant) 60%, transparent); }
.lg-when { color: var(--on-surface-variant); font-variant-numeric: tabular-nums; }
.lg-empty { text-align: center; color: var(--on-surface-variant); padding: 22px 0; }
.lg-role {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: color-mix(in srgb, var(--lgc, var(--primary)) 16%, transparent);
  color: color-mix(in srgb, var(--lgc, var(--primary)) 76%, var(--on-surface));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--lgc, var(--primary)) 34%, transparent);
}
/* 「方式」列：登录=真的敲了密码，访问=已登录设备当天第一次打开（手机基本只出现在这一类） */
.lg-kind {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 10.5px;
  font-weight: 600;
  border: 1px solid color-mix(in srgb, var(--on-surface) 18%, transparent);
  color: var(--on-surface-variant);
}
.lg-k-login { border-color: color-mix(in srgb, var(--primary) 42%, transparent); color: color-mix(in srgb, var(--primary) 82%, var(--on-surface)); }
/* 设备列：图标 + 「浏览器 · 系统」 */
.lg-dev { display: flex; align-items: center; gap: 6px; }
.lg-devic { display: inline-grid; place-items: center; line-height: 0; color: var(--on-surface-variant); flex: none; }
.lg-devic svg { display: block; }
/* IP 挂在位置下面一行，等宽数字方便对比 */
.lg-ip {
  display: block;
  margin-top: 2px;
  font-style: normal;
  font-size: 10.5px;
  font-variant-numeric: tabular-nums;
  color: var(--on-surface-variant);
  opacity: .75;
}
.lg-guest  { --lgc: #6b8cae; }
.lg-friend { --lgc: #12a884; }
.lg-admin  { --lgc: #b8862b; }
/* 临时通行登录的那一行：「登录 / 访问」后面再挂一枚橙色「临时」 */
.lg-k-pass { margin-left: 4px; border-color: color-mix(in srgb, #c9721f 55%, transparent); color: #c9721f; }

/* ---------- 临时通行弹窗（表格沿用登录日志那套） ---------- */
.ps-new { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.ps-new .btn-soft { display: inline-flex; align-items: center; gap: 6px; }
.ps-result {
  display: grid;
  gap: 10px;
  margin-bottom: 14px;
  padding: 12px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--primary) 35%, var(--outline-variant));
  background: color-mix(in srgb, var(--primary) 7%, var(--surface-container-lowest));
}
.ps-line { display: flex; align-items: center; gap: 8px; min-width: 0; }
.ps-url {
  flex: 1;
  min-width: 0;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--outline-variant);
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font: 12.5px/1.3 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.ps-code {
  font: 700 20px/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .12em;
  color: var(--on-surface);
  user-select: all;
}
.ps-until { font-size: 12px; color: var(--on-surface-variant); font-variant-numeric: tabular-nums; white-space: nowrap; }
.ps-st {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  border: 1px solid color-mix(in srgb, var(--on-surface) 18%, transparent);
  color: var(--on-surface-variant);
}
.ps-st.ps-unused { border-color: color-mix(in srgb, var(--primary) 42%, transparent); color: color-mix(in srgb, var(--primary) 82%, var(--on-surface)); }
.ps-st.ps-active { border-color: color-mix(in srgb, #c9721f 55%, transparent); color: #c9721f; background: color-mix(in srgb, #c9721f 10%, transparent); }
.ps-st.ps-ended, .ps-st.ps-expired { opacity: .7; }
.ps-end { padding: 4px 10px; font-size: 12px; }
.ps-endall { color: var(--error); }
.ps-endall:hover { color: var(--error); background: color-mix(in srgb, var(--error) 10%, transparent); }
@media (max-width: 520px) {
  .ps-line { flex-wrap: wrap; }
  .ps-url { flex-basis: 100%; }
  /* 手机上表格放不下五列，「撤销」会被挤到屏幕外。设备和位置收起来（通行被使用时手机推送里有这两项） */
  .ps-modal .lg-table { min-width: 0; }
  .ps-modal .lg-table th:nth-child(3), .ps-modal .lg-table td:nth-child(3),
  .ps-modal .lg-table th:nth-child(4), .ps-modal .lg-table td:nth-child(4) { display: none; }
}

@media (max-width: 520px) {
  .co-emoji { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .co-cover img { width: 104px; height: 58px; }
  .co-actions { flex-wrap: wrap; }
  .lg-modal { width: 100%; }
}

.field { display: block; margin-bottom: 14px; }
.field > span {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--on-surface-variant);
  margin-bottom: 6px;
}
.field > span em { color: var(--error); font-style: normal; }
.field input[type="text"] {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--outline);
  border-radius: var(--radius-sm);
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
}
.field input[type="text"]:focus { border-color: var(--primary); }
.field input[type="file"] { width: 100%; font-size: 13px; color: var(--on-surface-variant); }
.field input[type="file"]::file-selector-button {
  margin-right: 10px;
  padding: 8px 14px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  background: var(--surface-container);
  color: var(--on-surface);
  font-size: 13px;
  cursor: pointer;
}
.field-row { display: flex; gap: 12px; }
.field-row .field { flex: 1; }
/* 上传弹窗：AI 智能填充按钮 + 标签 chips + 图标点选网格 */
.ai-fill-row { display: flex; align-items: center; gap: 10px; margin: -4px 0 16px; }
.ai-fill-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: 1px solid var(--primary);
  color: var(--primary);
  background: transparent;
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.ai-fill-btn:hover:not(:disabled) { background: var(--primary); color: var(--on-primary); }
.ai-fill-btn:disabled { opacity: .55; cursor: progress; }
.ai-fill-status { font-size: 12px; color: var(--on-surface-variant); }
.ai-fill-status.err { color: var(--error); }

.tag-chips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 28px; align-items: center; }
.tag-chip {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--surface-container-highest);
  color: var(--on-surface);
  border-radius: 999px;
  padding: 3px 6px 3px 10px;
  font-size: 12px;
}
.tag-chip button { border: 0; background: none; color: var(--on-surface-variant); cursor: pointer; font-size: 14px; line-height: 1; padding: 0; }
.tag-chip button:hover { color: var(--error); }
.tag-empty { font-size: 12px; color: var(--on-surface-variant); }

.icon-picker {
  display: flex; flex-wrap: wrap; gap: 6px;
  max-height: 124px; overflow-y: auto;
  padding: 8px;
  border: 1px solid var(--outline, rgba(0,0,0,.12));
  border-radius: 12px;
  background: var(--surface-container, rgba(0,0,0,.02));
}
.icon-opt {
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  /* 显式走彩色 emoji 字体：部分系统下 button 不会自动回退到 emoji 字体，会显示空白方块 */
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Segoe UI Symbol", sans-serif;
  font-size: 19px; line-height: 1;
  border: 1.5px solid transparent;
  border-radius: 9px;
  background: transparent;
  cursor: pointer;
  transition: background .12s, border-color .12s;
}
.icon-opt:hover { background: var(--surface-container-highest); }
.icon-opt.selected { border-color: var(--primary); background: color-mix(in srgb, var(--primary) 14%, transparent); }

.modal-hint { font-size: 12px; color: var(--on-surface-variant); margin: 4px 0 18px; }
.modal-hint.err { color: var(--error); }

.modal .btn-row { display: flex; gap: 8px; justify-content: flex-end; }
.modal .btn-row button {
  padding: 9px 22px;
  border: none;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  transition: background-color var(--transition), filter var(--transition);
}
.modal .btn-cancel { background: transparent; color: var(--on-surface); }
.modal .btn-cancel:hover { background: var(--surface-container-highest); }
.modal .btn-confirm { background: var(--primary); color: var(--on-primary); }
.modal .btn-confirm:hover:not(:disabled) { filter: brightness(1.05); }
.modal .btn-confirm:disabled { opacity: 0.6; cursor: not-allowed; }

/* ========================================
   阅读器（全屏 + 悬浮工具栏）
   ======================================== */
body.reader {
  height: 100vh;
  overflow: hidden;
  background: var(--surface);
}

#content {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  background: var(--surface);
}

/* 顶部感应区：鼠标移上去唤出工具栏 */
.reader-hotzone {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 12px;
  z-index: 9;
}

.reader-bar {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: calc(100vw - 24px);
  padding: 7px 10px 7px 8px;
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--surface-container) 86%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
  border: 1px solid var(--outline-variant);
  box-shadow: var(--shadow-md);
  z-index: 11;
  transition: transform 250ms cubic-bezier(0.2,0,0,1), opacity 250ms ease;
}
.reader-bar.hidden {
  transform: translateX(-50%) translateY(-150%);
  opacity: 0;
  pointer-events: none;
}

.rb-btn {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  border: none;
  background: transparent;
  color: var(--on-surface);
  border-radius: var(--radius-full);
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition);
}
.rb-btn:hover { background: var(--surface-container-highest); }
.rb-back { font-size: 20px; }

/* 工具栏设为「隐藏」时的最小化返回键：始终悬浮在左上角、半透明不挡正文，
   保证没有浏览器返回手势/按钮的人也能退出课程。hover 变实。 */
.reader-mini-back {
  position: fixed;
  top: 12px;
  left: 12px;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--on-surface);
  border-radius: var(--radius-full);
  background: color-mix(in srgb, var(--surface-container) 80%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  backdrop-filter: blur(14px) saturate(1.4);
  border: 1px solid var(--outline-variant);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  opacity: 0.55;
  transition: opacity 200ms ease, background 200ms ease;
  z-index: 11;
}
.reader-mini-back:hover { opacity: 1; background: var(--surface-container-highest); }
.reader-mini-back[hidden] { display: none; }

.rb-info {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  padding: 0 6px;
}
.rb-subject {
  flex-shrink: 0;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--primary-container);
  color: var(--on-primary-container);
  font-size: 11px;
  font-weight: 600;
}
.rb-title {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 38vw;
}

.rb-progress {
  flex-shrink: 0;
  padding: 0 8px;
  font-size: 12px;
  color: var(--on-surface-variant);
  font-variant-numeric: tabular-nums;
}

/* 阅读工具栏：Aa 按钮（文字款） */
.rb-aa { font-size: 14px; font-weight: 700; letter-spacing: 0.02em; }

/* 只读分享徽标（仅分享模式显示） */
.rb-ro {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--primary-container);
  color: var(--on-primary-container);
}

/* 分享模式：隐藏一切「回主页 / 写入账号」的入口，只保留纯阅读功能 */
body.share-mode .rb-back,
body.share-mode #chat-toggle,
body.share-mode #bookmark-btn,
body.share-mode #bookmarks-toggle,
body.share-mode #share-btn { display: none; }

/* 分享对话框 */
.share-exp { flex-wrap: wrap; }
.share-exp .seg-btn { flex: 1 0 auto; min-width: 54px; }
.share-result { margin: 4px 0 14px; }
.share-link-row { display: flex; gap: 8px; align-items: stretch; }
.share-link-row input {
  flex: 1; min-width: 0;
  border: 1px solid var(--outline-variant);
  border-radius: 10px;
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font-size: 12.5px;
  padding: 9px 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.share-link-row .btn-confirm {
  flex: none;
  border: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 10px;
}

/* 阅读设置面板 */
#prefs-panel {
  position: fixed;
  top: 64px;
  right: 16px;
  width: 320px;
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 13;
  overflow: hidden;
}
.prefs-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 14px; }
.pref-row { display: flex; align-items: center; gap: 12px; }
.pref-label { flex: none; width: 58px; font-size: 12.5px; font-weight: 600; color: var(--on-surface-variant); }
.pref-row .seg { flex: 1; }
.pref-val {
  flex: none; width: 44px; text-align: right;
  font-size: 12px; color: var(--on-surface-variant); font-variant-numeric: tabular-nums;
}
#pref-scale { flex: 1; accent-color: var(--primary); }
.pref-reset {
  align-self: flex-start;
  padding: 7px 16px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface);
  font-size: 12.5px;
  transition: background-color var(--transition);
}
.pref-reset:hover { background: var(--surface-container-highest); }
#prefs-panel .sm-tip { margin: 0; }

/* 分屏对话：正文让出右侧，对话面板贴边成柱 */
body.reader.split-chat #content { width: calc(100% - min(420px, 44vw)); }
body.reader.split-chat #chat-panel {
  top: 0;
  right: 0;
  bottom: 0;
  width: min(420px, 44vw);
  max-width: none;
  max-height: none;
  height: 100vh;
  border-radius: 0;
  border: none;
  border-left: 1px solid var(--outline-variant);
  box-shadow: none;
}

/* 轻提示 toast */
#nb-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  padding: 10px 20px;
  background: var(--surface-container-highest);
  color: var(--on-surface);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  z-index: 300;
  transition: opacity 200ms ease, transform 200ms ease;
}
#nb-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* 书签面板 */
#bookmarks-panel {
  position: fixed;
  top: 64px;
  right: 16px;
  width: 320px;
  max-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 12;
  overflow: hidden;
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--outline-variant);
}
.panel-header h3 { display: flex; align-items: center; gap: 7px; font-size: 14px; font-weight: 600; }
.panel-header h3 .chat-status { font-weight: 400; }
.ph-actions { display: flex; align-items: center; gap: 2px; }

/* AI 模型切换条：独占一行，custom 样式的下拉 + 圆角胶囊 */
.chat-model-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--outline-variant);
  background: var(--surface-container-low);
}
.chat-model-bar .cmb-icon { display: inline-flex; color: var(--on-surface-variant); }
.chat-model-bar .cmb-label {
  font-size: 12px;
  color: var(--on-surface-variant);
  white-space: nowrap;
}
.cmb-select { position: relative; flex: 1; min-width: 0; }
.cmb-select select {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  font-size: 12.5px;
  line-height: 1.4;
  padding: 6px 30px 6px 12px;
  background: var(--surface-container-high);
  color: var(--on-surface);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  cursor: pointer;
  text-overflow: ellipsis;
  transition: border-color var(--transition), background-color var(--transition), box-shadow var(--transition);
}
.cmb-select select:hover { background: var(--surface-container-highest); }
.cmb-select select:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}
.cmb-select .cmb-caret {
  position: absolute;
  right: 11px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  line-height: 0;
  color: var(--on-surface-variant);
}
#bookmarks-list {
  list-style: none;
  padding: 8px;
  margin: 0;
  overflow-y: auto;
  flex: 1;
}
#bookmarks-list li {
  display: flex;
  align-items: center;
  gap: 4px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition);
}
#bookmarks-list li:hover { background: var(--surface-container-high); }
#bookmarks-list .bm-jump {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  align-items: flex-start;
  text-align: left;
  padding: 10px 12px;
  border: none;
  background: transparent;
  color: var(--on-surface);
  font-size: 13px;
  border-radius: var(--radius-sm);
}
#bookmarks-list .bm-jump .bm-pct {
  font-size: 11px;
  color: var(--on-surface-variant);
  font-variant-numeric: tabular-nums;
}
#bookmarks-list .bm-del {
  width: 32px;
  height: 32px;
  margin-right: 4px;
  border: none;
  background: transparent;
  color: var(--on-surface-variant);
  border-radius: var(--radius-full);
  font-size: 14px;
  opacity: 0;
  transition: opacity var(--transition), background-color var(--transition);
}
#bookmarks-list li:hover .bm-del { opacity: 1; }
#bookmarks-list .bm-del:hover { background: var(--surface-container-highest); color: var(--error); }
.empty-hint {
  padding: 32px 16px;
  text-align: center;
  font-size: 13px;
  color: var(--on-surface-variant);
  margin: 0;
}

/* ========================================
   目录 TOC 面板（左侧，镜像书签面板）
   ======================================== */
#toc-panel {
  position: fixed;
  top: 64px;
  left: 16px;
  width: 300px;
  max-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 12;
  overflow: hidden;
}
#toc-list { list-style: none; padding: 8px; margin: 0; overflow-y: auto; flex: 1; }
#toc-list li { margin: 0; }
.toc-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 7px 12px;
  border: none;
  background: transparent;
  color: var(--on-surface);
  font-size: 13px;
  line-height: 1.4;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background-color var(--transition);
}
.toc-item:hover { background: var(--surface-container-high); }
.toc-item:disabled { opacity: .5; cursor: default; }
.toc-item.lvl-0 { font-weight: 600; }
.toc-item.lvl-1 { padding-left: 26px; }
.toc-item.lvl-2 { padding-left: 40px; color: var(--on-surface-variant); }

/* ========================================
   AI 对话面板（RAG）
   ======================================== */
#chat-panel {
  position: fixed;
  top: 64px;
  right: 16px;
  width: 380px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 80px);
  display: flex;
  flex-direction: column;
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 13;
  overflow: hidden;
}
.chat-status { font-size: 11px; font-weight: 400; color: var(--on-surface-variant); margin-left: 6px; }
.chat-msgs {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.chat-hint { font-size: 12.5px; line-height: 1.6; color: var(--on-surface-variant); margin: 4px 2px; }
.chat-msg { display: flex; flex-direction: column; gap: 6px; max-width: 100%; }
.chat-msg.user { align-items: flex-end; }
.chat-msg.ai { align-items: flex-start; }
.chat-bubble {
  padding: 9px 12px;
  border-radius: 14px;
  font-size: 13.5px;
  line-height: 1.62;
  white-space: pre-wrap;
  word-break: break-word;
  max-width: 90%;
}
.chat-msg.user .chat-bubble { background: var(--primary); color: var(--on-primary); border-bottom-right-radius: 4px; }
.chat-msg.ai .chat-bubble { background: var(--surface-container-high); color: var(--on-surface); border-bottom-left-radius: 4px; }
.chat-msg.thinking .chat-bubble { color: var(--on-surface-variant); animation: chat-pulse 1.1s ease-in-out infinite; }
@keyframes chat-pulse { 0%,100% { opacity: .5; } 50% { opacity: 1; } }

/* AI 回答的 Markdown 渲染 */
.chat-bubble.md { white-space: normal; }
.chat-bubble.md > :first-child { margin-top: 0; }
.chat-bubble.md > :last-child { margin-bottom: 0; }
.chat-bubble.md p { margin: 0 0 8px; }
.chat-bubble.md ul, .chat-bubble.md ol { margin: 4px 0 8px; padding-left: 20px; }
.chat-bubble.md li { margin: 2px 0; }
.chat-bubble.md h4 { font-size: 15px; font-weight: 600; margin: 10px 0 6px; }
.chat-bubble.md h5 { font-size: 13.5px; font-weight: 600; margin: 8px 0 4px; }
.chat-bubble.md code {
  background: color-mix(in srgb, var(--on-surface) 12%, transparent);
  padding: 1px 5px;
  border-radius: 5px;
  font-size: .92em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.chat-bubble.md pre {
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: 8px;
  padding: 10px 12px;
  overflow-x: auto;
  margin: 6px 0;
}
.chat-bubble.md pre code { background: none; padding: 0; }
.chat-bubble.md a { color: var(--primary); text-decoration: underline; }
.chat-bubble.md blockquote {
  margin: 6px 0;
  padding: 2px 10px;
  border-left: 3px solid var(--outline-variant);
  color: var(--on-surface-variant);
}
.chat-bubble.md hr { border: none; border-top: 1px solid var(--outline-variant); margin: 8px 0; }
.chat-sources { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; padding-left: 2px; }
.cs-label { font-size: 11px; color: var(--on-surface-variant); }
.cs-chip {
  border: 1px solid var(--outline-variant);
  background: var(--surface-container-high);
  color: var(--primary);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 11.5px;
  cursor: pointer;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: background-color var(--transition);
}
.cs-chip:hover { background: var(--surface-container-highest); }
.chat-quote {
  display: flex; align-items: center; gap: 8px;
  margin: 0 12px;
  padding: 7px 10px;
  background: var(--surface-container-high);
  border-left: 3px solid var(--primary);
  border-radius: 8px;
  font-size: 12px;
}
.cq-label { color: var(--primary); font-weight: 600; flex: none; }
.cq-text { color: var(--on-surface-variant); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.cq-clear { border: none; background: none; color: var(--on-surface-variant); cursor: pointer; font-size: 13px; flex: none; }
.cq-clear:hover { color: var(--error); }
.chat-form {
  display: flex; align-items: flex-end; gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--outline-variant);
}
#chat-input {
  flex: 1;
  resize: none;
  border: 1px solid var(--outline-variant);
  border-radius: 12px;
  padding: 9px 12px;
  font: inherit;
  font-size: 13.5px;
  line-height: 1.5;
  background: var(--surface-container-lowest, var(--surface-container));
  color: var(--on-surface);
  max-height: 120px;
}
#chat-input:focus { outline: none; border-color: var(--primary); }
#chat-send {
  flex: none;
  width: 38px; height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: var(--primary);
  color: var(--on-primary);
  cursor: pointer;
  transition: filter var(--transition);
}
#chat-send:hover { filter: brightness(1.06); }
@media (max-width: 640px) {
  #chat-panel { right: 8px; left: 8px; width: auto; }
}

/* 划词浮条里的「问 AI」按钮 */
.nb-hl-sep { width: 1px; align-self: stretch; margin: 4px 2px; background: rgba(255,255,255,.25); }
.nb-hl-ask {
  border: none; background: transparent; cursor: pointer;
  font-size: 15px; line-height: 1; padding: 0 4px;
  display: inline-flex; align-items: center; justify-content: center;
}

/* ========================================
   高亮：选区浮条 + 批注弹层（建在父页）
   ======================================== */
.nb-hl-toolbar {
  position: fixed;
  z-index: 50;
  transform: translate(-50%, -100%);
  display: none;
  gap: 6px;
  padding: 6px 8px;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
}
.nb-hl-toolbar[data-below="1"] { transform: translate(-50%, 0); }
.nb-hl-toolbar.show { display: flex; }
.nb-hl-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, .15);
  cursor: pointer;
  padding: 0;
  transition: transform var(--transition);
}
.nb-hl-swatch:hover { transform: scale(1.14); }

.nb-hl-popover {
  position: fixed;
  z-index: 50;
  width: 240px;
  transform: translateY(-100%);
  display: none;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}
.nb-hl-popover[data-below="1"] { transform: translateY(0); }
.nb-hl-popover.show { display: flex; }
.nb-hl-colors { display: flex; gap: 8px; }
.nb-hl-note {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--outline);
  border-radius: var(--radius-sm);
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font: inherit;
  font-size: 13px;
  padding: 8px;
  outline: none;
}
.nb-hl-note:focus { border-color: var(--primary); }
.nb-hl-actions { display: flex; justify-content: space-between; }
.nb-hl-actions button {
  padding: 6px 14px;
  border: none;
  border-radius: var(--radius-full);
  font-size: 13px;
  cursor: pointer;
}
.nb-hl-del { background: transparent; color: var(--error); }
.nb-hl-del:hover { background: color-mix(in srgb, var(--error) 16%, transparent); }
.nb-hl-done { background: var(--primary); color: var(--on-primary); }

/* 加书签弹框 */
.bm-prompt-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 150ms ease-out;
}
.bm-prompt {
  background: var(--surface-container-high);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 360px;
  max-width: calc(100vw - 32px);
  box-shadow: var(--shadow-lg);
}
.bm-prompt h3 { font-size: 16px; margin-bottom: 16px; }
.bm-prompt input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--outline);
  border-radius: var(--radius-sm);
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font-size: 14px;
  outline: none;
  margin-bottom: 16px;
}
.bm-prompt input:focus { border-color: var(--primary); }
.bm-prompt .btn-row { display: flex; gap: 8px; justify-content: flex-end; }
.bm-prompt button {
  padding: 8px 20px;
  border: none;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  transition: background-color var(--transition);
}
.bm-prompt .btn-cancel { background: transparent; color: var(--on-surface); }
.bm-prompt .btn-cancel:hover { background: var(--surface-container-highest); }
.bm-prompt .btn-confirm { background: var(--primary); color: var(--on-primary); }
.bm-prompt .btn-confirm:hover { filter: brightness(0.95); }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ========================================
   深入搜索弹窗（首页搜索框按 Enter 打开）
   ======================================== */
.search-modal {
  width: 640px;
  max-width: calc(100vw - 32px);
  max-height: min(640px, calc(100vh - 64px));
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
}
.srch-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 18px 12px;
  border-bottom: 1px solid var(--outline-variant);
}
.srch-head h3 { font-size: 16px; margin: 0; flex: none; }
.srch-q {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  color: var(--on-surface-variant);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.srch-body { overflow-y: auto; padding: 12px 14px 18px; }
.srch-section-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--on-surface-variant);
  margin: 12px 6px 8px;
}
.srch-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--on-surface);
  cursor: pointer;
  transition: background-color var(--transition);
}
.srch-item:hover { background: var(--surface-container-high); }
.srch-item-top { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.srch-item-course { font-size: 13.5px; font-weight: 600; }
.srch-item-heading {
  font-size: 11px;
  padding: 2px 9px;
  border-radius: var(--radius-full);
  background: var(--primary-container);
  color: var(--on-primary-container);
  max-width: 50%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.srch-item-count { margin-left: auto; font-size: 11px; color: var(--on-surface-variant); flex: none; }
.srch-item-text {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--on-surface-variant);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.srch-item-text mark {
  background: color-mix(in srgb, var(--primary) 26%, transparent);
  color: inherit;
  border-radius: 3px;
  padding: 0 1px;
}
.srch-empty, .srch-loading {
  padding: 36px 16px;
  text-align: center;
  font-size: 13px;
  color: var(--on-surface-variant);
}
.srch-foot-tip {
  margin: 14px 6px 0;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--on-surface-variant);
}

/* ========================================
   登录页
   ======================================== */
/* 底色仍然铺一层渐变：百叶窗画布加载前（或 WebGL 不可用时）不至于一片死白，
   色调也照着百叶窗那两个端点走（粉 → 靛蓝），免得加载瞬间跳一下 */
body.login {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(at 18% 26%, rgba(255, 158, 253, .55) 0%, transparent 52%),
    radial-gradient(at 82% 74%, rgba(82, 38, 255, .55) 0%, transparent 52%),
    #14101f;
  padding: 24px;
}
/* 登录框走通透玻璃：底色只留一层薄雾，靠模糊 + 饱和把百叶窗的条纹折进来，
   顶缘一道高光当玻璃厚度。深浅主题都压在这块暗底背景上，所以字统一走浅色。 */
.login-card {
  position: relative;
  z-index: 1;          /* 压在背景画布之上 */
  background: color-mix(in srgb, var(--surface-container) 12%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.5) brightness(1.06);
  backdrop-filter: blur(14px) saturate(1.5) brightness(1.06);
  border: 1px solid rgba(255, 255, 255, .26);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  width: 100%;
  max-width: 400px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .4),
    inset 0 -1px 0 rgba(255, 255, 255, .1),
    0 26px 64px rgba(8, 6, 20, .45);
}
.login-logo {
  width: 210px;
  max-width: 72%;
  height: auto;
  display: block;
  margin: 4px auto 22px;
  filter: brightness(0) invert(1);      /* 玻璃底下一律反白，不再分主题 */
}
body.login .eyebrow { display: block; text-align: center; margin: 0 0 26px; color: rgba(255, 255, 255, .72); }
/* 字段：标签在上、框在下，框之间 14px。视图切换靠 [hidden]，所以 display 要让位给它 */
.login-field { display: block; margin-bottom: 14px; }
.login-field[hidden] { display: none; }
.login-field > span {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: rgba(255, 255, 255, .72);
  margin-bottom: 7px;
}
.login-field input {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid rgba(255, 255, 255, .26);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, .1);
  color: #fff;
  font-size: 16px;            /* 小于 16px 时 iOS 聚焦会自动放大页面 */
  outline: none;
  transition: border-color var(--transition), background-color var(--transition);
}
.login-field input::placeholder { color: rgba(255, 255, 255, .45); }
.login-field input:focus { border-color: rgba(255, 255, 255, .7); background: rgba(255, 255, 255, .16); }
#login-form #submit-btn { margin-top: 10px; }
/* 底下那排切换链接：玻璃上的弱文字，点了才亮 */
.login-links {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-top: 22px;
}
.login-links button {
  border: 0;
  background: none;
  padding: 6px 10px;
  border-radius: var(--radius-full);
  color: rgba(255, 255, 255, .62);
  font-size: 13px;
  transition: color var(--transition), background-color var(--transition);
}
.login-links button:hover { color: #fff; background: rgba(255, 255, 255, .1); }
.login-links button[hidden] { display: none; }
/* 按钮走「玻璃上的白药丸」：紫底上白色比品牌紫更跳得出来（临时通行落地页的按钮同款） */
#submit-btn, #pass-go {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, .92);
  color: #241b3a;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(8, 6, 20, .28);
  transition: background-color var(--transition), transform var(--transition);
}
#submit-btn:hover:not(:disabled), #pass-go:hover:not(:disabled) { background: #fff; transform: translateY(-1px); }
#submit-btn:disabled, #pass-go:disabled { opacity: 0.6; cursor: not-allowed; }
/* 临时通行落地页：到期时间就压在按钮上面 */
.pass-until {
  margin: -8px 0 22px;
  text-align: center;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.error-msg {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--error);
  color: var(--on-error);
  border-radius: var(--radius-sm);
  font-size: 13px;
  text-align: center;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 640px) {
  .topbar { padding: 16px 20px; flex-wrap: wrap; gap: 14px; }
  .topbar-right { width: 100%; }
  .search-wrap { max-width: none; flex: 1; }
  /* 窄屏胶囊收成纯图标，省横向空间 */
  .pill-btn .pill-label, .pill-btn .pill-caret { display: none; }
  .pill-btn { padding: 9px 11px; }
  .create-menu { width: min(300px, calc(100vw - 40px)); }
  main { padding: 8px 20px 56px; }
  .card-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .nb-card { min-height: 160px; padding: 16px; }
  .rb-title { max-width: 44vw; }
  #bookmarks-panel { right: 8px; left: 8px; width: auto; }
  #toc-panel { left: 8px; right: 8px; width: auto; }
  #prefs-panel { right: 8px; left: 8px; width: auto; }
  /* 窄屏分屏没有意义，退回浮层布局 */
  body.reader.split-chat #content { width: 100%; }
  body.reader.split-chat #chat-panel {
    top: 64px; right: 8px; left: 8px; bottom: auto;
    width: auto; height: auto; max-height: calc(100vh - 80px);
    border: 1px solid var(--outline-variant); border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
  }
}
@media (max-width: 400px) {
  .card-grid { grid-template-columns: 1fr; }
}

/* ========================================
   设置下拉（⚙️ 外观 / 关于 / 退出）
   ======================================== */
.settings-wrap { position: relative; flex-shrink: 0; }
.settings-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface);
  font-size: 18px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition), transform var(--transition);
}
.settings-btn:hover { background: var(--surface-container-high); }
.settings-btn[aria-expanded="true"] { background: var(--surface-container-high); transform: rotate(45deg); }

.settings-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 248px;
  padding: 10px;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 60;
  animation: settings-pop 140ms ease-out;
  transform-origin: top right;
}
@keyframes settings-pop {
  from { opacity: 0; transform: translateY(-6px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.sm-section { padding: 6px 6px 10px; }
.sm-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  margin-bottom: 8px;
}
/* ---- 设置面板的两屏（根屏 / 页面设置）----
   子屏用 hidden 收起而不是位移：面板本身要跟着当前屏收高，
   位移方案得给容器定高，几百像素的外观区在手机上撑不下。 */
.sm-pane[hidden] { display: none; }
.sm-pane-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 2px 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--outline-variant);
}
.sm-pane-head b { font-size: 14px; font-weight: 650; }
.sm-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--on-surface-variant);
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
}
.sm-back:hover { background: var(--surface-container-highest); color: var(--on-surface); }
.sm-drill .sm-chev { margin-left: auto; color: var(--on-surface-variant); display: inline-flex; }
/* 分段控件的迷你版：塞在小标题右边当视图切换 */
.seg.seg-mini { display: inline-flex; flex: none; gap: 2px; padding: 2px; }
.seg.seg-mini .seg-btn { flex: none; padding: 3px 9px; font-size: 11px; letter-spacing: 0; text-transform: none; }
/* ---- 登录活跃热力图（设置面板，见 app.js renderHeat）----
   7 行 = 周日到周六，一列一周；列数由 JS 写进 grid-template-columns。
   设置面板只有 340px 宽，一整年排不下，所以横向滚动、默认滚到最右（最近一周）。 */
.heat { --hc: 9px; }
.heat-note { margin: 2px; font-size: 11.5px; color: var(--on-surface-variant); }
.heat-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 0 2px 7px;
  font-size: 11.5px;
  color: var(--on-surface-variant);
}
.heat-top b { color: var(--on-surface); font-weight: 650; }
.heat-legend { display: inline-flex; align-items: center; gap: 3px; }
/* 一年那么宽，面板只有 340px：横向滚。手机上直接手指滑；桌面没有横向滚轮，
   所以 app.js 里把竖滚轮换算成横向滚动、并支持按住拖动，这里补一条看得见的细滚动条。 */
.heat-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--on-surface) 22%, transparent) transparent;
  padding-bottom: 4px;
  cursor: grab;
  overscroll-behavior-x: contain;
}
.heat-scroll.dragging { cursor: grabbing; }
.heat-scroll::-webkit-scrollbar { height: 6px; }
.heat-scroll::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--on-surface) 22%, transparent);
  border-radius: 99px;
}
.heat-scroll::-webkit-scrollbar-track { background: transparent; }
.heat-grid {
  display: grid;
  grid-template-rows: repeat(7, var(--hc)) 14px;
  gap: 3px;
  width: max-content;
}
.hc {
  display: block;
  width: var(--hc);
  height: var(--hc);
  border-radius: 2.5px;
  background: color-mix(in srgb, var(--on-surface) 9%, transparent);
}
.hc.l1 { background: color-mix(in srgb, var(--primary) 30%, transparent); }
.hc.l2 { background: color-mix(in srgb, var(--primary) 52%, transparent); }
.hc.l3 { background: color-mix(in srgb, var(--primary) 74%, transparent); }
.hc.l4 { background: var(--primary); }
.hm {
  grid-row: 8;
  align-self: end;
  font-size: 9.5px;
  font-style: normal;
  color: var(--on-surface-variant);
  white-space: nowrap;
}
/* ---- 月视图：一整月摊成日历，格子大到能写下日期，不用横向滚 ---- */
.heat-nav { display: inline-flex; align-items: center; gap: 2px; }
.heat-nav button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  padding: 0;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--on-surface-variant);
  cursor: pointer;
}
.heat-nav button:hover:not(:disabled) { background: var(--surface-container-highest); color: var(--on-surface); }
.heat-nav button:disabled { opacity: .3; cursor: default; }
.heat-nav b { min-width: 74px; text-align: center; color: var(--on-surface); font-weight: 600; }
.heat-cal {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}
.heat-cal .hw {
  font-size: 10px;
  font-style: normal;
  text-align: center;
  color: var(--on-surface-variant);
  padding-bottom: 2px;
}
.heat-cal .hd {
  position: relative;
  aspect-ratio: 1;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--on-surface-variant);
  background: color-mix(in srgb, var(--on-surface) 7%, transparent);
}
.heat-cal .hd.l1 { background: color-mix(in srgb, var(--primary) 30%, transparent); }
.heat-cal .hd.l2 { background: color-mix(in srgb, var(--primary) 52%, transparent); }
.heat-cal .hd.l3 { background: color-mix(in srgb, var(--primary) 74%, transparent); color: #fff; }
.heat-cal .hd.l4 { background: var(--primary); color: #fff; }
.heat-cal .hd.pad { background: transparent; color: transparent; }
.heat-cal .hd.today { box-shadow: 0 0 0 2px var(--primary); }

.seg {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--surface-container-lowest);
  border-radius: var(--radius-full);
}
.seg-btn {
  flex: 1;
  padding: 7px 4px;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--on-surface-variant);
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
}
.seg-btn:hover { color: var(--on-surface); }
.seg-btn.active {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,.2));
}

/* ========================================
   分段控件的滑块指示器（见 assets/segment.js）
   ======================================== */
.seg.slide { position: relative; }
/* 药丸交给 .seg-thumb 画，按钮自己的底色让位（文字颜色还是要跟着切） */
.seg.slide .seg-btn { position: relative; z-index: 2; }
.seg.slide .seg-btn.active { background: transparent; box-shadow: none; color: var(--on-primary, #fff); }
/* 未选中的格子悬停给一层极淡的底，指明可点，但别抢药丸的戏 */
.seg.slide .seg-btn:not(.active):hover { background: color-mix(in srgb, var(--on-surface) 8%, transparent); }
.seg-thumb {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  border-radius: 100vw;
  background: var(--primary);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .22),
    0 1px 4px color-mix(in srgb, var(--primary) 42%, transparent);
  transform: translate3d(var(--tx, 0), var(--ty, 0), 0) scaleX(var(--sx, 1));
  transform-origin: center;
  pointer-events: none;
  /* 位移带一点点回弹；宽度跟着走，拉伸(--sx)单独用一条更快的曲线收回去 */
  transition:
    transform 380ms cubic-bezier(.34, 1.24, .44, 1),
    width 380ms cubic-bezier(.34, 1.24, .44, 1),
    height 200ms ease;
}
.seg-thumb.moving { filter: saturate(1.12); }
@media (prefers-reduced-motion: reduce) {
  .seg-thumb { transition: none; }
}
.sm-tip {
  margin: 8px 2px 0;
  font-size: 11px;
  line-height: 1.5;
  color: var(--on-surface-variant);
}
.sm-divider { height: 1px; background: var(--outline-variant); margin: 6px 4px; }
.sm-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--on-surface);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition);
}
.sm-item:hover { background: var(--surface-container-highest); }
.sm-item .sm-ic { display: inline-flex; align-items: center; justify-content: center; width: 18px; }
.sm-danger { color: var(--error); }
.sm-danger:hover { background: color-mix(in srgb, var(--error) 12%, transparent); }

/* ========================================
   关于 / 学习画像弹窗（炫酷版）
   ======================================== */
.about-card {
  position: relative;
  width: 460px;
  max-width: 100%;
  max-height: calc(100vh - 40px);
  overflow: hidden auto;
  background: var(--surface-container-high);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: settings-pop 200ms cubic-bezier(.2,.8,.2,1);
}
.about-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,.18);
  color: #fff;
  cursor: pointer;
  z-index: 2;
  backdrop-filter: blur(4px);
  transition: background-color var(--transition);
}
.about-close:hover { background: rgba(255,255,255,.32); }

.about-hero {
  position: relative;
  padding: 36px 28px 28px;
  text-align: center;
  color: #fff;
  overflow: hidden;
  background: linear-gradient(140deg, #6750A4 0%, #8E5BC8 52%, #5A7FE0 100%);
}
/* 柔和单色高光，取代原先的彩色极光，与全站简洁观感统一 */
.about-aurora {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 90% at 25% 0%, rgba(255,255,255,.22), transparent 65%),
    radial-gradient(55% 80% at 90% 110%, rgba(255,255,255,.14), transparent 70%);
  pointer-events: none;
}
.about-hero-inner { position: relative; z-index: 1; }
.about-badge {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.28);
  color: #fff;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}
.about-title { font-size: 22px; font-weight: 700; margin: 14px 0 6px; }
.about-sub { font-size: 13.5px; opacity: .92; line-height: 1.5; max-width: 320px; margin: 0 auto; }

.about-body { padding: 22px 24px 6px; }
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}
.about-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 12px 4px;
  background: var(--surface-container-lowest);
  border-radius: var(--radius-md, 12px);
  border: 1px solid var(--outline-variant);
}
.about-stat .as-ic { display: inline-flex; align-items: center; justify-content: center; color: var(--primary); margin-bottom: 2px; }
.about-stat .as-n {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}
.about-stat .as-label { font-size: 11px; color: var(--on-surface-variant); }

.about-block { margin-bottom: 18px; }
.about-block-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--on-surface-variant);
  margin-bottom: 10px;
}
.about-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.about-chip {
  padding: 6px 13px;
  font-size: 12.5px;
  font-weight: 500;
  border-radius: var(--radius-full);
  color: var(--on-surface);
  background: color-mix(in srgb, var(--primary) 14%, var(--surface-container-lowest));
  border: 1px solid color-mix(in srgb, var(--primary) 26%, transparent);
}
.about-note {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--on-surface);
  background: var(--surface-container-lowest);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 13px 15px;
  margin-bottom: 6px;
}
.about-foot {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 16px 24px 22px;
  text-align: center;
}
.about-foot-brand { font-size: 13px; font-weight: 600; color: var(--on-surface); }
.about-foot-dim { font-size: 11px; color: var(--on-surface-variant); }

@media (max-width: 480px) {
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}

/* ========================================
   内容审核（管理员）
   ======================================== */
.sm-badge {
  margin-left: auto;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  color: #fff;
  background: var(--error);
  border-radius: var(--radius-full);
}
.review-modal-box {
  width: 600px;
  max-height: calc(100vh - 48px);
  display: flex;
  flex-direction: column;
}
.rv-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}
.rv-head h3 { display: flex; align-items: center; gap: 8px; margin-bottom: 0; }
.rv-body {
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 60px;
}
.rv-loading, .rv-empty {
  text-align: center;
  color: var(--on-surface-variant);
  font-size: 13.5px;
  padding: 28px 0;
}
.rv-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
}
.rv-icon { font-size: 26px; line-height: 1; flex-shrink: 0; }
.rv-info { flex: 1; min-width: 0; }
.rv-info h4 { font-size: 14.5px; font-weight: 600; margin: 0 0 3px; word-break: break-word; }
.rv-meta { font-size: 12px; color: var(--on-surface-variant); margin: 0 0 4px; }
.rv-desc { font-size: 12.5px; color: var(--on-surface); margin: 0; line-height: 1.5; word-break: break-word; }
.rv-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}
.rv-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 60px;
  padding: 6px 12px;
  font-size: 12.5px;
  font-weight: 600;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  background: var(--surface-container-high);
  color: var(--on-surface);
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
.rv-btn:hover { background: var(--surface-container-highest); }
.rv-approve {
  background: color-mix(in srgb, var(--primary) 16%, var(--surface-container-lowest));
  border-color: color-mix(in srgb, var(--primary) 30%, transparent);
  color: var(--primary);
}
.rv-approve:hover { background: var(--primary); color: #fff; }
.rv-reject:hover { background: var(--error); color: #fff; border-color: var(--error); }

@media (max-width: 560px) {
  .rv-card { flex-wrap: wrap; }
  .rv-actions { flex-direction: row; width: 100%; }
  .rv-btn { flex: 1; }
}

/* ========================================
   云盘
   ======================================== */
.drive-back { display: inline-flex; align-items: center; gap: 8px; }
.drive-back .ic { color: var(--on-surface-variant); }
.drive-title {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 15px;
  font-weight: 600;
  color: var(--on-surface);
}
.drive-role-badge {
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  color: var(--on-surface-variant);
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
}
.drive-role-badge.admin {
  color: var(--primary);
  background: color-mix(in srgb, var(--primary) 14%, var(--surface-container-lowest));
  border-color: color-mix(in srgb, var(--primary) 28%, transparent);
}
.drive-main { max-width: 960px; margin: 0 auto; padding: 18px 24px 60px; }

.drive-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.drive-crumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 2px; min-width: 0; }
.crumb {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  border: none;
  background: transparent;
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.crumb:hover { background: var(--surface-container-high); }
.crumb.current { color: var(--on-surface); font-weight: 600; cursor: default; }
.crumb-sep { color: var(--on-surface-variant); font-size: 13px; }
.drive-actions { display: flex; gap: 8px; flex-shrink: 0; }

.drive-dropzone { position: relative; border-radius: var(--radius-lg); min-height: 200px; }
.drive-dropzone.dragover {
  outline: 2px dashed var(--primary);
  outline-offset: 4px;
  background: color-mix(in srgb, var(--primary) 7%, transparent);
}
.drive-drop-hint {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
  pointer-events: none;
}
.drive-dropzone.dragover .drive-drop-hint { display: flex; }

.drive-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.drive-loading, .drive-empty {
  color: var(--on-surface-variant);
  font-size: 13.5px;
  text-align: center;
  padding: 40px 0;
  list-style: none;
}
.drive-item {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 11px 12px;
  border-radius: var(--radius-md);
  transition: background 120ms;
}
.drive-item:hover { background: var(--surface-container-low); }
.di-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
}
.drive-item.is-dir .di-icon { color: var(--primary); }
.drive-item.is-file .di-icon { color: var(--on-surface-variant); }
.di-main { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 1px; }
.di-name {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--on-surface);
  text-align: left;
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.di-name:hover { color: var(--primary); text-decoration: underline; }
.di-meta { font-size: 12px; color: var(--on-surface-variant); }
.di-actions { display: flex; gap: 4px; flex-shrink: 0; opacity: 0; transition: opacity 120ms; }
.drive-item:hover .di-actions, .drive-item:focus-within .di-actions { opacity: 1; }
.di-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--on-surface-variant);
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
}
.di-btn:hover { background: var(--surface-container-highest); color: var(--on-surface); }
.di-del:hover { background: var(--error); color: #fff; }
@media (hover: none) { .di-actions { opacity: 1; } }

.drive-uploads {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 320px;
  max-width: calc(100vw - 40px);
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 80;
}
.up-row { display: grid; grid-template-columns: 1fr auto; grid-template-rows: auto auto; gap: 2px 8px; align-items: center; }
.up-name { font-size: 12.5px; color: var(--on-surface); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.up-pct { font-size: 12px; color: var(--on-surface-variant); grid-row: 1; grid-column: 2; }
.up-bar { grid-column: 1 / -1; height: 4px; border-radius: var(--radius-full); background: var(--surface-container-highest); overflow: hidden; }
.up-bar i { display: block; height: 100%; background: var(--primary); transition: width 120ms; }
.up-row.done .up-pct { color: var(--primary); }
.up-row.done.pending .up-pct { color: #c77800; font-size: 11px; font-weight: 600; }
.up-row.done.pending .up-bar i { background: #e0902a; }
.up-row.err .up-pct, .up-row.err .up-name { color: var(--error); }

@media (max-width: 520px) {
  .drive-main { padding: 14px 14px 60px; }
  .drive-bar { flex-direction: column; align-items: stretch; }
  .drive-tools { flex-wrap: wrap; }
  .drive-actions { justify-content: flex-end; }
  .drive-actions .pill-label { display: none; }
}

/* ---- 云盘工具栏：搜索 / 排序 / 容量 ---- */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.drive-tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.drive-search {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-full);
  color: var(--on-surface-variant);
}
.drive-search input { border: none; background: transparent; color: var(--on-surface); font-size: 13px; width: 130px; outline: none; }
.drive-sort { display: flex; align-items: center; gap: 4px; }
.drive-sort select {
  padding: 6px 8px; font-size: 13px;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-sm);
  color: var(--on-surface); cursor: pointer;
}
#drive-sort-dir .nbi { transition: transform 150ms; }
#drive-sort-dir.desc .nbi { transform: rotate(180deg); }
.drive-foot { margin-top: 18px; font-size: 12px; color: var(--on-surface-variant); }
.quota-head { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 6px; flex-wrap: wrap; }
.quota-bar { height: 8px; border-radius: var(--radius-full); background: var(--surface-container-highest); overflow: hidden; }
.quota-bar i { display: block; height: 100%; background: var(--primary); border-radius: var(--radius-full); transition: width 200ms; }

/* 对外可见开关 + 仅管理员可见的暗显 */
.drive-item .di-actions { opacity: 1; }
.di-vis {
  font-size: 11px; font-weight: 600; padding: 3px 9px; flex-shrink: 0;
  border-radius: var(--radius-full); border: 1px solid var(--outline-variant);
  background: var(--surface-container-high); color: var(--on-surface-variant); cursor: pointer;
}
.di-vis.on {
  background: color-mix(in srgb, var(--primary) 16%, var(--surface-container-lowest));
  border-color: color-mix(in srgb, var(--primary) 30%, transparent); color: var(--primary);
}

/* 拖拽移动：高亮目标文件夹 / 面包屑 */
.drive-item.drag-target { outline: 2px solid var(--primary); outline-offset: -2px; background: color-mix(in srgb, var(--primary) 10%, transparent); border-radius: var(--radius-md); }
.crumb.drag-target { background: color-mix(in srgb, var(--primary) 22%, transparent); }
.drive-item[draggable="true"] { cursor: grab; }

/* ---- 分享：创建弹窗 ---- */
.share-form { display: flex; flex-direction: column; gap: 2px; }
.share-form select, .share-form input {
  width: 100%; padding: 9px 11px; font-size: 14px;
  border: 1px solid var(--outline-variant); border-radius: var(--radius-sm);
  background: var(--surface-container-lowest); color: var(--on-surface);
}
.share-result { margin: 14px 0 4px; font-size: 13px; color: var(--on-surface-variant); }
.share-link-row { display: flex; gap: 8px; margin-top: 8px; }
.share-link-row input {
  flex: 1; padding: 9px 11px; font-size: 13px;
  border: 1px solid var(--outline-variant); border-radius: var(--radius-sm);
  background: var(--surface-container-lowest); color: var(--on-surface);
}

/* ---- 分享：管理列表标签 ---- */
.sh-tag {
  display: inline-block; font-size: 11.5px; padding: 2px 8px; margin-right: 4px;
  border-radius: var(--radius-full);
  background: var(--surface-container-high); color: var(--on-surface-variant);
}
.sh-tag.err { background: color-mix(in srgb, var(--error) 16%, transparent); color: var(--error); }

/* ---- 文件预览弹窗 ---- */
.preview-box {
  width: min(960px, 96vw); height: min(86vh, 900px);
  background: var(--surface-container-high);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex; flex-direction: column; overflow: hidden;
}
.preview-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--outline-variant);
}
.preview-name { font-size: 14.5px; font-weight: 600; color: var(--on-surface); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.preview-actions { display: flex; gap: 4px; flex-shrink: 0; }
.preview-body { flex: 1; min-height: 0; display: flex; align-items: center; justify-content: center; background: var(--surface-container-lowest); overflow: auto; }
.preview-body img { max-width: 100%; max-height: 100%; object-fit: contain; }
.preview-body video { max-width: 100%; max-height: 100%; }
.preview-body iframe { width: 100%; height: 100%; border: 0; background: #fff; }
#review-btn .sm-badge { margin-left: 4px; }
/* 「账号」那一项的「未建」：提醒而不是报错，用语义橙不用红 */
.sm-badge-warn { background: #c9721f; font-weight: 600; padding: 0 7px; }
.preview-audio { padding: 0 16px; }
.preview-audio audio { width: min(520px, 86vw); }
.preview-none { color: var(--on-surface-variant); font-size: 14px; line-height: 1.7; text-align: center; padding: 40px; }
.preview-none a.btn-confirm { display: inline-block; text-decoration: none; margin-top: 6px; }

/* ---- 公开分享访问页 ---- */
.ds-gate { display: flex; justify-content: center; padding: 60px 16px; }
.ds-gate-card {
  width: 340px; max-width: 100%; text-align: center;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant); border-radius: var(--radius-lg);
  padding: 28px 24px; box-shadow: var(--shadow-md);
}
.ds-gate-ic { color: var(--primary); display: inline-flex; margin-bottom: 10px; }
.ds-gate-card h3 { font-size: 16px; margin-bottom: 16px; }
.ds-gate-card input {
  width: 100%; padding: 10px 12px; font-size: 14px; margin-bottom: 10px;
  border: 1px solid var(--outline-variant); border-radius: var(--radius-sm);
  background: var(--surface-container-lowest); color: var(--on-surface);
}
.ds-gate-card .btn-confirm { width: 100%; }
.ds-gate-err { color: var(--error); font-size: 12.5px; margin-bottom: 10px; }
.ds-file { margin-top: 12px; }
.ds-file-head {
  display: flex; align-items: center; gap: 12px;
  padding: 14px; background: var(--surface-container-low);
  border-radius: var(--radius-md);
}
.ds-file-head .di-icon { color: var(--on-surface-variant); }
.ds-file-name { font-size: 15px; font-weight: 600; color: var(--on-surface); }
.ds-prev-wrap { margin-top: 14px; border: 1px solid var(--outline-variant); border-radius: var(--radius-md); overflow: hidden; background: var(--surface-container-lowest); }
.ds-prev { display: block; width: 100%; }
img.ds-prev { max-height: 70vh; object-fit: contain; }
iframe.ds-prev { height: 75vh; border: 0; background: #fff; }
video.ds-prev { max-height: 70vh; background: #000; }

/* ========================================
   主页动态背景（设置 → 动态背景）
   ======================================== */
:root[data-bg]:not([data-bg="none"]) body.home,
:root[data-bg]:not([data-bg="none"]) body.ask { background-color: transparent; }
/* 课程区压在动态背景画布（z-index 0）之上；首页 Dock 自己是 sticky + z-index 80，见 premium.css */
body.home > main { position: relative; z-index: 1; }
/* 浓淡 / 亮度两根滑杆（theme.js 写入 CSS 变量）。
   深浅两种主题下背景完全一致 —— 不再按主题偷偷改透明度或提亮，明暗全交给用户。 */
.nb-background-canvas {
  position: fixed; inset: 0; z-index: 0;
  width: 100vw; height: 100vh;
  pointer-events: none;
  opacity: var(--nb-bg-opacity, .55);
  filter: saturate(1.08) brightness(var(--nb-bg-brightness, 1)) blur(var(--nb-bg-blur, 0px));
  transition: opacity 160ms ease, filter 160ms ease;
}
:root[data-bg]:not([data-bg="none"]) body.home::before { opacity: .22; }

/* 自定义图片背景：铺满视口。
   这一层不做任何"美化"——浓淡 100 / 亮度 50 就是 opacity:1 + brightness(1)，
   也就是把用户上传的图原样贴上去。以前这里额外打 6 折又加饱和度，结果是
   滑杆推满也比原图淡一大截，看着像调不动。要改效果请改滑杆，别在这儿加系数。 */
.nb-background-image {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  opacity: var(--nb-bg-opacity, .55);
  filter: brightness(var(--nb-bg-brightness, 1)) blur(var(--nb-bg-blur, 0px));
  /* 虚化会让边缘透出底色，往外撑一圈盖住 */
  transform: scale(1.04);
  transition: opacity 160ms ease, filter 160ms ease;
}

/* WebGL 不可用时仍保留对应的静态氛围，不退回一片空白。 */
:root.nb-bg-fallback[data-bg="blinds"] body.home {
  background-image: repeating-linear-gradient(90deg, #5227ff33 0 22px, transparent 22px 44px), linear-gradient(90deg, #ff9ffc4d, #5227ff4d);
}
:root.nb-bg-fallback[data-bg="waves"] body.home {
  background-image: repeating-linear-gradient(0deg, #5227ff2e 0 14px, transparent 14px 58px), linear-gradient(120deg, #ff9ffc3d, #5227ff3d);
}
:root.nb-bg-fallback[data-bg="terrain"] body.home {
  background-image: repeating-radial-gradient(ellipse at 46% 44%, #5227ff33 0 5px, transparent 5px 22px), radial-gradient(70vw 50vh at 60% 40%, #ff9ffc33, transparent 72%);
}

/* ========================================
   设置面板：身份卡 + 背景手风琴
   ======================================== */
.settings-menu {
  width: 340px;
  max-height: calc(100vh - 92px);
  overflow: auto;
  scrollbar-width: thin;
}

/* ---- 身份卡：一级访客 / 二级好友 / 三级管理员 ---- */
.idcard {
  --idc: var(--primary);
  position: relative;
  display: flex;
  align-items: center;
  gap: 11px;
  margin: 2px 2px 10px;
  padding: 9px 13px;
  border-radius: 14px;
  border: 1px solid color-mix(in srgb, var(--idc) 30%, var(--outline-variant));
  background:
    radial-gradient(120% 160% at 0% 0%, color-mix(in srgb, var(--idc) 20%, transparent), transparent 62%),
    var(--surface-container-lowest);
  overflow: hidden;
}
/* 斜向高光，让卡片有一点会员卡的质感 */
.idcard::after {
  content: '';
  position: absolute;
  top: -60%; right: -20%;
  width: 58%; height: 220%;
  transform: rotate(18deg);
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--idc) 16%, transparent), transparent);
  pointer-events: none;
}
.idcard[data-role="guest"]  { --idc: #6b8cae; }
.idcard[data-role="friend"] { --idc: #12a884; }
.idcard[data-role="admin"]  { --idc: #b8862b; }

.idcard-avatar {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px; height: 30px;
  border-radius: 50%;
  line-height: 0;
  color: color-mix(in srgb, var(--idc) 82%, var(--on-surface));
  background: color-mix(in srgb, var(--idc) 18%, var(--surface-container-high));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--idc) 38%, transparent);
}
.idcard-avatar svg { display: block; }
.idcard-name {
  position: relative;
  z-index: 1;
  min-width: 0;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  color: color-mix(in srgb, var(--idc) 72%, var(--on-surface));
}
/* Xi 账号：名字后面跟一个淡一点的等级词（「夏熙 管理员」）；旧口令会话只有等级词 */
.idcard-role {
  position: relative;
  z-index: 1;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .02em;
  color: color-mix(in srgb, var(--idc) 58%, var(--on-surface-variant));
}
.idcard-name + .idcard-role:empty { display: none; }
/* 临时通行登录进来的：右侧挂「临时 h:mm」（剩余时间），语义橙 */
.idcard-temp {
  position: relative;
  z-index: 1;
  margin-left: auto;
  padding: 2px 8px;
  border-radius: 999px;
  font-style: normal;
  font-size: 11px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: #c9721f;
  background: color-mix(in srgb, #c9721f 13%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, #c9721f 40%, transparent);
}
/* ---- 背景手风琴 ---- */
.sm-count {
  font-style: normal;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  opacity: .65;
  margin-right: auto;   /* 计数跟在标题后面，别被 space-between 推到最右 */
}
/* 浓淡 / 亮度两根弹性滑杆：选了素色就都没意义，直接收起来 */
.bg-sliders { margin-top: 10px; display: grid; gap: 2px; }
.es-row { display: flex; align-items: center; gap: 6px; position: relative; }
.es-row .es-wrap { flex: 1; min-width: 0; }
:root[data-bg="none"] .bg-sliders { display: none; }
/* 顶栏通透度独立成一根杆，和背景选择无关，素色背景下也照常显示 */
.bar-slider { margin-top: 2px; }

/* ---- 弹性滑杆（移植自 React Bits ElasticSlider，见 assets/slider.js）---- */
.es-native { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
/* 悬停时原版 ElasticSlider 会把整条杆放大到 1.2，在窄面板里会顶出边界，
   所以这里不缩放外壳 —— --es-scale 只留给轨道长高（见 .es-track 的 calc）。 */
.es-wrap {
  --es-scale: 1;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 3px 0;
  touch-action: none;
  user-select: none;
  opacity: .7;
  transition: opacity 220ms ease;
}
.es-wrap.es-active { opacity: 1; }
.es-icon {
  flex: none;
  display: grid; place-items: center;
  width: 15px; height: 15px;
  color: var(--on-surface-variant);
  line-height: 0;
  transition: transform 200ms cubic-bezier(.2,.8,.2,1);
}
.es-icon svg { display: block; }
.es-root {
  position: relative;
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  padding: 9px 0;
  cursor: grab;
  touch-action: none;
}
.es-root:active { cursor: grabbing; }
.es-track-wrap { flex: 1; min-width: 0; display: flex; }
.es-track {
  position: relative;
  flex: 1;
  height: calc(4px + (var(--es-scale) - 1) * 30px);   /* 1→4px，1.2→10px */
  overflow: hidden;
  border-radius: 999px;
  background: color-mix(in srgb, var(--on-surface) 16%, transparent);
  transition: height 200ms cubic-bezier(.2,.8,.2,1);
}
.es-range {
  position: absolute;
  inset: 0 auto 0 0;
  height: 100%;
  border-radius: 999px;
  background: var(--primary);
}
.es-value {
  position: absolute;
  top: -3px; left: 50%;
  transform: translateX(-50%);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--on-surface-variant);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}
.es-wrap.es-active .es-value { opacity: 1; }

.sm-hint {
  margin: 7px 1px 0;
  font-size: 10.5px;
  line-height: 1.45;
  color: var(--on-surface-variant);
  opacity: .82;
}
.bg-accordion {
  display: flex;
  gap: 5px;
  height: 92px;
}
.bg-panel {
  position: relative;
  box-sizing: border-box;
  flex: 1 1 0;
  min-width: 0;
  padding: 0;
  border: 1px solid var(--outline-variant);
  border-radius: 12px;
  background: var(--surface-container-lowest);
  overflow: hidden;
  cursor: pointer;
  /* 手风琴靠 flex-grow 过渡，不用 JS 也不用 width 计算 */
  transition: flex-grow 380ms cubic-bezier(.2, .8, .2, 1), border-color var(--transition), box-shadow var(--transition);
}
.bg-accordion:hover .bg-panel { flex-grow: .7; }
.bg-panel.on { flex-grow: 1.7; border-color: color-mix(in srgb, var(--primary) 62%, var(--outline-variant)); }
.bg-accordion .bg-panel:hover,
.bg-accordion .bg-panel:focus-visible { flex-grow: 3.4; z-index: 2; }
.bg-panel:focus-visible { outline: 2px solid var(--primary); outline-offset: 1px; }

.bp-art {
  position: absolute;
  inset: 0;
  display: block;
  background-color: #0b0c17;
  background-position: center;
  background-size: cover;
}
/* 素色在深色主题下两半都很暗，中间补一条分界线才看得出是「关掉背景」 */
.bp-none {
  background:
    linear-gradient(135deg, transparent calc(50% - .5px), color-mix(in srgb, var(--on-surface) 34%, transparent) calc(50% - .5px) calc(50% + .5px), transparent calc(50% + .5px)),
    linear-gradient(135deg, var(--surface-container-lowest) 0 50%, var(--surface-container-high) 50%);
}
/* 缩略图是各着色器的 CSS 近似，不额外起 WebGL 预览（8 个 WebGL 上下文太重） */
.bp-blinds {
  background: repeating-linear-gradient(90deg, #ff9ffc 0 4px, #2a1a5e 4px 7px), linear-gradient(90deg, #ff9ffc, #5227ff);
  background-blend-mode: multiply, normal;
}
.bp-waves {
  background: repeating-linear-gradient(0deg, #5227ff 0 5px, #120f17 5px 16px), linear-gradient(120deg, #ff9ffc, #5227ff);
  background-blend-mode: screen, normal;
}
.bp-terrain {
  background: repeating-radial-gradient(ellipse at 44% 46%, #ff9ffc 0 2px, #16122a 2px 9px);
}
.bp-add {
  display: grid;
  place-items: center;
  background: var(--surface-container-lowest);
  color: var(--on-surface-variant);
  font-size: 19px;
  font-weight: 300;
}
.bg-add { border-style: dashed; }
.bg-add:hover .bp-add { color: var(--primary); }

/* 标签平时藏起来，只有展开那一格才露出来 */
.bp-label {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 14px 8px 6px;
  background: linear-gradient(transparent, rgba(6, 8, 16, .72));
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 200ms ease, transform 240ms ease;
}
.bg-panel:hover .bp-label,
.bg-panel:focus-visible .bp-label,
.bg-panel.on .bp-label { opacity: 1; transform: none; }
.bp-bar {
  flex: none;
  width: 3px; height: 10px;
  border-radius: 2px;
  background: #fff;
  opacity: .85;
}
.bg-panel.on .bp-bar { background: var(--primary); opacity: 1; }
.bg-add .bp-label { background: none; color: var(--on-surface-variant); }
.bg-add .bp-bar { background: currentColor; }

.bp-check {
  position: absolute;
  top: 5px; left: 5px;
  display: grid; place-items: center;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--on-primary, #fff);
  font-size: 10px;
  line-height: 1;
  opacity: 0;
  transform: scale(.6);
  transition: opacity 160ms ease, transform 200ms cubic-bezier(.2, 1.4, .4, 1);
}
.bg-panel.on .bp-check { opacity: 1; transform: none; }

.bp-del {
  position: absolute;
  top: 5px; right: 5px;
  display: grid; place-items: center;
  width: 17px; height: 17px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(8, 10, 18, .62);
  color: #fff;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 160ms ease, background-color var(--transition);
}
.bg-panel:hover .bp-del,
.bg-panel:focus-within .bp-del { opacity: 1; }
.bp-del:hover { background: #d0342c; }

@media (max-width: 520px) {
  .settings-menu { width: min(340px, calc(100vw - 24px)); max-height: calc(100dvh - 86px); }
  /* 触屏没有 hover，手风琴退化成网格，每格都看得见 */
  .bg-accordion { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; height: auto; }
  .bg-panel { height: 50px; }
  .bg-panel:hover, .bg-accordion:hover .bg-panel { flex-grow: 1; }
  .bp-label, .bg-panel.on .bp-label { opacity: 0; }
  .bp-del { opacity: 1; }
}

/* 触屏 / 无悬停设备：同样别依赖 hover 才能看清 */
@media (hover: none) {
  .bp-del { opacity: 1; }
}

/* ========================================
   下载中心（download.html + assets/dlcenter.js）
   ======================================== */
.dlc-main { max-width: 860px; margin: 0 auto; padding: 18px 20px 60px; display: grid; gap: 16px; }
.dlc-card {
  padding: 16px 18px 18px;
  background: var(--surface-container-low);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
}
.dlc-h {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  font-size: 15.5px;
  font-weight: 650;
  color: var(--on-surface);
}
.dlc-h .ic { color: var(--primary); }
.dlc-h-btn { margin-left: auto; }
.dlc-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--outline-variant);
  border-radius: 12px;
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font-size: 13px;
  font-family: inherit;
  resize: vertical;
}
textarea.dlc-input { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; line-height: 1.6; }
.dlc-input:focus { outline: none; border-color: var(--primary); }
.dlc-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 10px; }
.dlc-dest { flex: none; width: auto; }
.dlc-dest .seg-btn { padding: 6px 14px; }
.dlc-folder { flex: 1 1 180px; width: auto; }
.dlc-msg { margin: 10px 2px 0; font-size: 13px; color: var(--on-surface-variant); }
.dlc-msg.ok { color: var(--primary); }
.dlc-msg.warn { color: var(--error); }

/* 闸门 + 云盘用量 */
.dlc-meters { margin-top: 14px; display: grid; gap: 8px; }
.dlc-gate { font-size: 12.5px; color: var(--on-surface-variant); }
.dlc-gate b { color: var(--on-surface); font-weight: 600; }
.dlc-dot { margin: 0 8px; opacity: .5; }
.dlc-quotas { display: flex; flex-wrap: wrap; gap: 16px; }
.dlc-meter { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--on-surface-variant); }
.dlc-meter em { font-style: normal; }
.dlc-meter .dlc-bar { width: 120px; }
.dlc-bar {
  display: block;
  height: 6px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--on-surface) 10%, transparent);
  overflow: hidden;
}
.dlc-bar > i { display: block; height: 100%; background: var(--primary); border-radius: 99px; transition: width 400ms ease; }

/* 任务卡 */
.dlc-jobs { margin-top: 14px; display: grid; gap: 10px; }
.dlc-empty { margin: 6px 2px; font-size: 13px; color: var(--on-surface-variant); }
.dlc-job {
  padding: 10px 12px;
  border: 1px solid var(--outline-variant);
  border-radius: 12px;
  background: var(--surface-container-lowest);
}
.dlc-job-top { display: flex; align-items: center; gap: 10px; margin-bottom: 7px; }
.dlc-job-name { flex: 1; min-width: 0; font-size: 13.5px; font-weight: 600; word-break: break-all; }
.dlc-job-tag {
  flex: none;
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: 99px;
  color: var(--primary);
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}
.dlc-job-tag.done { color: #16a34a; background: color-mix(in srgb, #16a34a 14%, transparent); }
.dlc-job-tag.error { color: var(--error); background: color-mix(in srgb, var(--error) 14%, transparent); }
.dlc-job-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 7px;
  font-size: 11.5px;
  color: var(--on-surface-variant);
}
.dlc-err { color: var(--error); }
.dlc-job-acts { display: inline-flex; align-items: center; gap: 6px; flex: none; }
.dlc-job-acts a, .dlc-job-acts button {
  display: inline-flex;
  align-items: center;
  padding: 4px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--on-surface-variant);
  cursor: pointer;
}
.dlc-job-acts a:hover, .dlc-job-acts button:hover { background: var(--surface-container-highest); color: var(--on-surface); }
.dlc-who { font-style: normal; opacity: .8; }
.dlc-clear {
  justify-self: start;
  padding: 6px 12px;
  border: 1px solid var(--outline-variant);
  border-radius: 99px;
  background: transparent;
  color: var(--on-surface-variant);
  font-size: 12px;
  cursor: pointer;
}
.dlc-clear:hover { background: var(--surface-container-highest); }

/* 限速表（仅管理员） */
.dlc-limits { display: grid; gap: 10px; }
.dlc-lrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 10px 12px;
  border: 1px solid var(--outline-variant);
  border-radius: 12px;
  background: var(--surface-container-lowest);
}
.dlc-lname { flex: 0 0 118px; font-size: 13px; font-weight: 600; }
.dlc-lf { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--on-surface-variant); }
.dlc-lf input[type="number"] {
  width: 68px;
  padding: 5px 8px;
  border: 1px solid var(--outline-variant);
  border-radius: 8px;
  background: var(--surface-container-high);
  color: var(--on-surface);
  font-size: 12.5px;
}
.dlc-lnote { margin: 2px; font-size: 12px; color: var(--on-surface-variant); }

/* 本地下载器 */
.dlc-steps { margin: 14px 0 0; padding-left: 20px; font-size: 13px; line-height: 2; color: var(--on-surface); }
.dlc-steps code, .dlc-cmd code {
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--surface-container-high);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
}
.dlc-cmd { margin-top: 14px; }
.dlc-cmd label { display: block; margin-bottom: 6px; font-size: 12.5px; color: var(--on-surface-variant); }
.dlc-cmd-row { display: flex; gap: 8px; }
.dlc-cmd-row input {
  flex: 1;
  min-width: 0;
  padding: 9px 12px;
  border: 1px solid var(--outline-variant);
  border-radius: 10px;
  background: var(--surface-container-lowest);
  color: var(--on-surface);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px;
}

@media (max-width: 600px) {
  .dlc-main { padding: 14px 12px 48px; }
  .dlc-card { padding: 14px 13px 16px; }
  .dlc-lname { flex-basis: 100%; }
}

/* 下载中心的窄屏修正：
   ① 顶栏标题会被挤成一列竖字，钉死不折行、并让身份徽章先让位；
   ② 正文里的胶囊按钮必须留住文字 —— 「探测」「开始转存」「下载安装包」用的都是同一套图标，
      套用全站那条「窄屏收成纯图标」的规则会变成三个看不出区别的圆钮。 */
.dlc-page .drive-title { white-space: nowrap; }
.dlc-main .pill-btn .pill-label { display: inline !important; }
@media (max-width: 640px) {
  .dlc-page .topbar { gap: 10px; }
  .dlc-page .topbar-right { width: auto; flex: 1; justify-content: flex-end; }
  .dlc-page .drive-role-badge { display: none; }   /* 身份在任务列表里还会标，顶栏这份可省 */
  .dlc-main .pill-btn { padding: 9px 14px; }
  .dlc-row { gap: 8px; }
  .dlc-folder { flex-basis: 100%; }
}
/* 只剩一个去处时（非管理员没有 Xi Pan），分段控件退化成一个标签，别再假装能点 */
.dlc-dest.solo { pointer-events: none; }