/* Ivory-Platinum / Black-Gold 主题。
   - 默认 = DAY (ivory-platinum)
   - data-theme="night" 或 (data-theme="auto" + 系统暗色) → NIGHT (black-gold)
   - 中性色一律暖偏,绝不纯黑 / 纯白
   - 金 / 铂金只做 accent / 描边 / 大字号 + button 填充时配深色文字
*/

:root {
  /* DAY · 象牙白金 */
  --bg-0:          #F6F4EF;                  /* canvas:暖象牙底 */
  --bg-1:          #FFFFFF;                  /* surface:抽屉 / 顶栏 / 卡片 */
  --bg-2:          #EFEDE6;                  /* hover */
  --bg-3:          #E0D6BE;                  /* inset / 分隔 (= border.gold) */
  --ink:           #2A2620;                  /* text.primary */
  --ink-soft:      #6B6456;                  /* text.secondary */
  --ink-muted:     #9A9382;                  /* dimmer */
  --accent:        #B7B19F;                  /* accent.metal 铂金 */
  --accent-strong: #8A8472;                  /* accent.deep   */
  --accent-soft:   rgba(183, 177, 159, 0.18);
  --on-accent:     #2A2620;                  /* accent 上面用的深色文字 */
  --danger:        #9D3D2D;                  /* 暖偏砖红 */
  --danger-soft:   rgba(157, 61, 45, 0.12);
  --line:          #E8DFC9;                  /* hairline (champagne) */
  --line-strong:   #E0D6BE;                  /* divider (= border.gold) */
  --overlay:       rgba(42, 38, 32, 0.45);   /* idle / drop / backdrop 蒙层 */

  --font-ui: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", system-ui, sans-serif;
}

:root[data-theme="night"] {
  /* NIGHT · 黑金 */
  --bg-0:          #121110;
  --bg-1:          #1C1B18;
  --bg-2:          #232220;
  --bg-3:          #33302A;
  --ink:           #EDE7D6;
  --ink-soft:      #9A9176;
  --ink-muted:     #75705F;
  --accent:        #C8A24C;                  /* antique gold */
  --accent-strong: #B08828;
  --accent-soft:   rgba(200, 162, 76, 0.18);
  --on-accent:     #121110;
  --danger:        #C26F5A;
  --danger-soft:   rgba(194, 111, 90, 0.18);
  --line:          #2A2823;
  --line-strong:   #33302A;
  --overlay:       rgba(0, 0, 0, 0.55);
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
    --bg-0:          #121110;
    --bg-1:          #1C1B18;
    --bg-2:          #232220;
    --bg-3:          #33302A;
    --ink:           #EDE7D6;
    --ink-soft:      #9A9176;
    --ink-muted:     #75705F;
    --accent:        #C8A24C;
    --accent-strong: #B08828;
    --accent-soft:   rgba(200, 162, 76, 0.18);
    --on-accent:     #121110;
    --danger:        #C26F5A;
    --danger-soft:   rgba(194, 111, 90, 0.18);
    --line:          #2A2823;
    --line-strong:   #33302A;
    --overlay:       rgba(0, 0, 0, 0.55);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  width: 100%;
  height: 100%;
}

body {
  background: var(--bg-0);
  color: var(--ink);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  height: 100dvh;
  overflow: hidden;
}

/* ── Main surface: full-screen PDF viewer ────────────────────────── */

.surface {
  position: relative;
  height: 100dvh;
  overflow: hidden;
}

/* viewer 物理上从 "top-bar + 安全区" 下方开始,不靠 padding-top 兜底压顶栏 */
.viewer-container {
  position: absolute;
  top: calc(36px + env(safe-area-inset-top, 0px));
  left: 0;
  right: 0;
  bottom: 0;
  overflow: auto;
  background: var(--bg-0);
  /* PDF.js 需要 container.position 是 absolute / relative */
  scrollbar-width: auto;
  scrollbar-color: var(--accent-strong) var(--bg-1);
}
/* 滚动条:24px 全宽实心,!important 压住 UA 样式(Quest browser 默认 scrollbar 在我们这边太细)。
   overflow-y: scroll 强制常驻,layout 稳定不抖。 */
.viewer-container { overflow-y: scroll !important; }
.viewer-container::-webkit-scrollbar { width: 24px !important; height: 24px !important; }
.viewer-container::-webkit-scrollbar-track { background: var(--bg-1) !important; }
.viewer-container::-webkit-scrollbar-thumb {
  background: var(--accent-strong) !important;
  border-radius: 12px !important;
  min-height: 48px;
}
.viewer-container::-webkit-scrollbar-thumb:hover { background: var(--accent) !important; }
.viewer-container::-webkit-scrollbar-thumb:active { background: var(--accent) !important; }
.viewer-container::-webkit-scrollbar-corner { background: var(--bg-1) !important; }

/* Drawer / outline 列表同规格 */
.doc-list, .outline-list {
  scrollbar-width: auto;
  scrollbar-color: var(--accent-strong) var(--bg-1);
}
.doc-list::-webkit-scrollbar, .outline-list::-webkit-scrollbar { width: 18px !important; }
.doc-list::-webkit-scrollbar-track, .outline-list::-webkit-scrollbar-track { background: var(--bg-1) !important; }
.doc-list::-webkit-scrollbar-thumb, .outline-list::-webkit-scrollbar-thumb {
  background: var(--accent-strong) !important;
  border-radius: 9px !important;
  min-height: 40px;
}
.doc-list::-webkit-scrollbar-thumb:hover, .outline-list::-webkit-scrollbar-thumb:hover {
  background: var(--accent) !important;
}

/* pdf.js 的 .pdfViewer 内部布局 */
#viewer.pdfViewer {
  padding: 8px 0 80px;   /* viewer 已经在顶栏下面,这里只留一点呼吸 */
}

/* viewer 隐藏(进入概览模式时) */
.viewer-container.hidden { display: none; }

/* 缩略图概览(全屏覆盖,从顶栏下沿到底) */
.thumb-container {
  position: absolute;
  top: calc(36px + env(safe-area-inset-top, 0px));
  left: 0;
  right: 0;
  bottom: 0;
  overflow: auto;
  background: var(--bg-0);
  padding: 16px;
  scrollbar-width: auto;
  scrollbar-color: var(--accent-strong) transparent;
}
.thumb-container.hidden { display: none; }
.thumb-container::-webkit-scrollbar { width: 14px; }
.thumb-container::-webkit-scrollbar-thumb {
  background: var(--accent-strong);
  border-radius: 7px;
  border: 3px solid transparent;
  background-clip: padding-box;
}

/* 自己 roll 的缩略图 grid。
   ⚠ 用 class 而不是 #id —— 否则 specificity 比 .thumb-container.hidden 高,
      永远 display:grid,会覆盖在 viewer 上变成"黑屏" (night 模式 bg-0 = 黑)。 */
.thumb-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(180px, 28vw), 1fr));
  gap: 16px;
  align-content: start;
}
.thumb-container > .thumb-card { max-width: 100%; }

.thumb-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 4px;
}
.thumb-canvas-wrap {
  border: 2px solid var(--line-strong);
  border-radius: 4px;
  background: var(--bg-1);
  width: 100%;
  /* 占位:渲染前用 A4 比例撑高度,避免布局抖动 */
  aspect-ratio: 1 / 1.414;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-sizing: border-box;
  transition: border-color 120ms ease;
}
.thumb-card:hover .thumb-canvas-wrap { border-color: var(--accent-strong); }
.thumb-card.current .thumb-canvas-wrap {
  border-color: var(--accent);
  border-width: 3px;
}
.thumb-canvas-wrap canvas {
  display: block;
  width: 100%;
  height: auto;
}
.thumb-label {
  font-size: 12px;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}
.thumb-card.current .thumb-label {
  color: var(--accent);
  font-weight: 600;
}

/* 中键拖拽平移时的视觉 (默认光标交给 pdf.js text-layer 的 cursor:text) */
.viewer-container.panning,
.viewer-container.panning * { cursor: grabbing !important; user-select: none; }

/* 单页模式:每个 .page 是一张 card */
#viewer.pdfViewer .page {
  margin: 8px auto;
  border: 1px solid var(--line);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

/* 双页(spread)模式:pdf.js 把两页包在 .spread 里。card 升到 .spread,
   两页内部去边、去阴影、贴在一起像一本翻开的书 */
#viewer.pdfViewer .spread {
  margin: 8px auto;
  border: 1px solid var(--line);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  display: inline-flex;
  background: var(--bg-1);  /* 极少数 PDF 页面背景透明时兜底 */
}
#viewer.pdfViewer .spread .page {
  margin: 0 !important;
  border: 0;
  box-shadow: none;
}
/* 双页之间留一根淡淡的"书脊"线 */
#viewer.pdfViewer .spread .page + .page {
  border-left: 1px solid var(--line);
}

/* ── Top bar (实心窄条,实占空间) ─────────────────────────────── */

.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: flex-end;  /* icons 贴底,让出 safe-area-top */
  gap: 8px;
  padding-top: env(safe-area-inset-top, 0px);
  padding-left: max(10px, env(safe-area-inset-left, 0px));
  padding-right: max(10px, env(safe-area-inset-right, 0px));
  padding-bottom: 0;
  min-height: calc(36px + env(safe-area-inset-top, 0px));
  background: var(--bg-1);
  border-bottom: 1px solid var(--line-strong);
  z-index: 5;
}

.icon-button {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 120ms ease, background 120ms ease;
}
.icon-button:hover { background: var(--bg-2); color: var(--ink); }
.icon-button svg { width: 20px; height: 20px; }

/* drawer 里图标按钮再大一档 */
.drawer-header .icon-button { width: 36px; height: 36px; }
.drawer-header .icon-button svg { width: 20px; height: 20px; }

.top-bar .title {
  flex: 1 1 auto;
  font-size: 16px;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.top-bar .status {
  flex: 0 0 auto;
  font-size: 13px;
  color: var(--ink-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.top-bar .status .sep { opacity: 0.4; }
#syncStatus.error    { color: var(--danger); }
#syncStatus.unsynced { color: var(--accent-strong); }
#syncStatus.syncing  { color: var(--accent); }   /* 颜色暗示,不闪 —— 阅读时别干扰注意力 */

/* ── Drawer (file panel) ─────────────────────────────────────── */

.backdrop {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 20;
  opacity: 1;
  transition: opacity 180ms ease;
}
.backdrop.hidden { opacity: 0; pointer-events: none; }

.drawer {
  position: fixed;
  top: 0;
  left: 0;
  height: 100dvh;
  width: min(360px, 90vw);
  background: var(--bg-1);
  border-right: 1px solid var(--line-strong);
  box-shadow: 4px 0 16px rgba(0, 0, 0, 0.08);
  z-index: 30;
  display: flex;
  flex-direction: column;
  transform: translateX(0);
  transition: transform 200ms ease;
  /* iOS notch / Android cutout 安全区 */
  padding-top: env(safe-area-inset-top, 0px);
  padding-left: env(safe-area-inset-left, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.drawer.hidden { transform: translateX(-100%); }

.drawer-header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  min-height: 44px;
}
.drawer-header h2 {
  margin: 0;
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.auth-row {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 8px;
}
.auth-row .who { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.auth-row button {
  border: 0;
  background: transparent;
  color: var(--accent);
  font-size: 12px;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
}
.auth-row button:hover { background: var(--accent-soft); }

.view-controls {
  display: flex;
  gap: 4px;
  padding: 6px 12px;
  border-bottom: 1px solid var(--line);
}
.vc-button {
  flex: 1 1 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  background: transparent;
  color: var(--ink-soft);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}
.vc-button:hover { background: var(--bg-2); color: var(--ink); }
.vc-button svg {
  width: 20px;
  height: 20px;
  display: block;     /* 避免 inline 默认基线对齐把图标挤没 */
  stroke: currentColor;
}

.drawer-actions {
  display: flex;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--line);
}
.drawer-actions.hidden { display: none; }
.drawer-action {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 10px;
  font-size: 12px;
  background: var(--bg-2);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}
.drawer-action:hover { background: var(--bg-3); }
.drawer-action.danger { color: var(--danger); border-color: var(--danger-soft); }
.drawer-action.danger:hover { background: var(--danger-soft); }
.drawer-action svg { width: 14px; height: 14px; }

.doc-list {
  list-style: none;
  margin: 0;
  padding: 4px 0;
  overflow-y: auto;
  flex: 1 1 auto;
}
.doc-list-empty {
  padding: 24px 16px;
  color: var(--ink-muted);
  font-size: 12px;
  text-align: center;
}
.doc-list-empty.hidden { display: none; }
.doc-row {
  position: relative;             /* row-actions 用绝对定位悬浮,不参与撑高 */
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  cursor: pointer;
  border-left: 3px solid transparent;
}
.doc-row:hover { background: var(--bg-2); }
.doc-row.active { border-left-color: var(--accent); background: var(--bg-2); }
.doc-row .name {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.doc-row .meta {
  font-size: 10px;
  color: var(--ink-muted);
  white-space: nowrap;
}
.doc-row .cache-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--line-strong);
}
.doc-row.cached .cache-dot {
  background: var(--accent);
  border-color: var(--accent);
}
/* hover 时浮出来,不占据行高 (绝对定位 + 不透明背景遮住 .meta) */
.doc-row .row-actions {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  gap: 4px;
  opacity: 0;
  pointer-events: none;
  background: var(--bg-2);
  padding: 2px 4px;
  border-radius: 4px;
  transition: opacity 120ms ease;
}
.doc-row:hover .row-actions {
  opacity: 1;
  pointer-events: auto;
}
.doc-row .row-actions button {
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  padding: 4px;
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.doc-row .row-actions button:hover { background: var(--bg-3); color: var(--ink); }

.doc-row .name-input {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  font-family: inherit;
  color: var(--ink);
  background: var(--bg-1);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 2px 6px;
}

.drawer-foot {
  border-top: 1px solid var(--line);
  padding: 6px 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.drawer-foot-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
}
.drawer-foot-button:hover { color: var(--ink); background: var(--bg-2); }
.drawer-foot-button svg { width: 14px; height: 14px; }

/* PDF outline drawer (跟 .drawer 共享样式,只是 list 显示密一些) */
.outline-list {
  list-style: none;
  margin: 0;
  padding: 4px 0;
  overflow-y: auto;
  flex: 1 1 auto;
  font-size: 13px;
}
.outline-item {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 5px 12px 5px 0;
  cursor: pointer;
  color: var(--ink);
  border-left: 3px solid transparent;
  line-height: 1.35;
}
.outline-item:hover { background: var(--bg-2); }
.outline-item.active { border-left-color: var(--accent); background: var(--bg-2); }
.outline-item .twisty {
  flex: 0 0 14px;
  width: 14px;
  text-align: center;
  color: var(--ink-muted);
  font-size: 10px;
  user-select: none;
}
.outline-item .label {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.outline-children {
  list-style: none;
  margin: 0;
  padding: 0;
}
.outline-children.collapsed { display: none; }

/* ── Toasts / overlays ───────────────────────────────────────── */

.toast {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg-1);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  z-index: 40;
  font-size: 13px;
}
.toast.hidden { display: none; }
.toast button {
  background: transparent;
  border: 0;
  color: var(--accent);
  font-size: 12px;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
}
.toast button:hover { background: var(--accent-soft); }
.toast .dismiss { color: var(--ink-muted); }

.idle-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  cursor: pointer;
}
.idle-overlay.hidden { display: none; }
.idle-card {
  background: var(--bg-1);
  border-radius: 12px;
  padding: 20px 24px;
  max-width: 320px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}
.idle-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
}
.idle-hint {
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0;
}

/* Loading 进度条 (PDF 还在下载时,贴在顶栏下沿) */
.progress-bar {
  position: fixed;
  top: calc(36px + env(safe-area-inset-top, 0px));
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-soft);
  z-index: 4;
}
.progress-bar.hidden { display: none; }
.progress-bar .fill {
  height: 100%;
  background: var(--accent);
  width: 0;
  transition: width 200ms ease;
}

/* 落地空态:登录前 / 没有任何论文时,中间一行提示 */
.empty-landing {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  font-size: 14px;
  text-align: center;
  padding: 24px;
  gap: 12px;
}
.empty-landing.hidden { display: none; }
.empty-landing .title { font-size: 18px; color: var(--ink); font-weight: 600; }
.empty-landing .hint { font-size: 13px; color: var(--ink-muted); max-width: 360px; }
.empty-landing button {
  margin-top: 8px;
  padding: 8px 14px;
  font-size: 13px;
  background: var(--accent);
  color: var(--on-accent);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
.empty-landing button:hover { background: var(--accent-strong); color: var(--on-accent); }

/* Drag-and-drop overlay */
.drop-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
  pointer-events: none;  /* 让 drop / dragover 事件落到下层 surface,不被 overlay 吃 */
}
.drop-overlay.hidden { display: none; }
.drop-card {
  background: var(--bg-1);
  color: var(--ink);
  padding: 28px 36px;
  border-radius: 14px;
  border: 2px dashed var(--accent);
  text-align: center;
  box-shadow: 0 10px 40px rgba(0,0,0,0.22);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--accent-strong);
}
.drop-card svg { color: var(--accent); }
.drop-title { margin: 0; font-size: 16px; font-weight: 600; }
.drop-hint { margin: 0; font-size: 12px; color: var(--ink-soft); }

/* SR-only */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}