:root {
  /* 参考协作/文档类 UI：冷灰侧栏 + 白主区 + 饱和主色蓝 */
  --dfos-accent: #0095ff;
  --dfos-accent-hover: #0078d4;
  --dfos-shell-bg: #f5f7f9;
  --dfos-content-bg: #ffffff;
  --dfos-text-primary: #1a1a1a;
  --dfos-text-body: #333333;
  --dfos-text-muted: #999999;
  --dfos-border: #e0e0e0;
  --bg: var(--dfos-shell-bg);
  --card: #ffffff;
  --text: var(--dfos-text-body);
  --border: var(--dfos-border);
  --dfos-min: 960px;
  --dfos-max: 1440px;
  --dfos-briefing-h1-size: 2.5rem;
  --dfos-briefing-h1-weight: 700;
  --dfos-briefing-h1-spacing: -0.03em;
  --dfos-briefing-h1-line: 1.2;
  --dfos-briefing-h2-size: 1.375rem;
  --dfos-briefing-h2-weight: 600;
  --dfos-briefing-h2-spacing: -0.012em;
  --dfos-briefing-h2-line: 1.3;
  --dfos-briefing-text: var(--dfos-text-body);
  /* 顶 40px；正文区左右 80px；底 24px；侧栏左右较窄 */
  --dfos-pad-top: 40px;
  --dfos-sidebar-pad-x: 24px;
  --dfos-content-pad-x: 80px;
  --dfos-pad-bottom: 24px;
  --dfos-content-pad: var(--dfos-content-pad-x);
  --dfos-radius: 10px;
  --dfos-font: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica,
    "Apple Color Emoji", Arial, sans-serif, "Segoe UI Emoji", "Segoe UI Symbol",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei";
  /* 正文/标题：思源宋体 / 系统宋体栈（书籍详情页风格） */
  --dfos-font-serif: "Source Han Serif SC", "Noto Serif SC", "Noto Serif CJK SC",
    "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
  /* 窄轨、目录侧栏、日期行默认共用的底；仅日期按钮另有悬停/选中 */
  --dfos-chrome-bg: #f5f7f9;
  --dfos-sidebar-bg: var(--dfos-chrome-bg);
  --dfos-date-row-bg: var(--dfos-chrome-bg);
  --dfos-date-row-active: #ffffff;
  --dfos-date-row-active-hover: #f5f6f7;
  --dfos-rail-bg: var(--dfos-chrome-bg);
  --dfos-rail-active-bg: var(--dfos-chrome-bg);
  --dfos-date-divider: rgba(55, 53, 47, 0.1);
  /* 仅最左「日报」窄轨右侧投影 */
  --dfos-rail-shadow: 8px 0 24px rgba(15, 15, 20, 0.08);
  --dfos-rail-shadow-mobile: 0 4px 18px rgba(15, 15, 20, 0.09);
  --dfos-nav-hover-bg: #eef6fc;
  --dfos-nav-active-hover-bg: #eef6fc;
  /* 文章重点高亮：浅黄底 */
  --dfos-key-bg: #fff9c4;
  --dfos-qa-q-bg: #eef6fc;
  --dfos-qa-mark: #0095ff;
  --dfos-a-border: rgba(0, 149, 255, 0.35);
  --dfos-range-track: #e5e5e5;
}

html[data-theme="dark"] {
  --dfos-accent: #5eb0ff;
  --dfos-accent-hover: #8ec8ff;
  --dfos-shell-bg: #1e1e22;
  --dfos-content-bg: #252528;
  --dfos-text-primary: #f5f5f7;
  --dfos-text-body: #d1d1d6;
  --dfos-text-muted: #8e8e93;
  --dfos-border: #3a3a40;
  --dfos-chrome-bg: #252528;
  --dfos-sidebar-bg: var(--dfos-chrome-bg);
  --dfos-date-row-bg: var(--dfos-chrome-bg);
  /* 选中/悬停仅日期行变化，略提亮 */
  --dfos-date-row-active: #32353c;
  --dfos-date-row-active-hover: #383d48;
  --dfos-rail-bg: var(--dfos-chrome-bg);
  --dfos-rail-active-bg: var(--dfos-chrome-bg);
  --dfos-date-divider: rgba(255, 255, 255, 0.1);
  --dfos-rail-shadow: 10px 0 32px rgba(0, 0, 0, 0.38);
  --dfos-rail-shadow-mobile: 0 4px 20px rgba(0, 0, 0, 0.45);
  --dfos-nav-hover-bg: rgba(94, 176, 255, 0.12);
  --dfos-nav-active-hover-bg: rgba(94, 176, 255, 0.16);
  --dfos-key-bg: rgba(250, 204, 21, 0.28);
  --dfos-qa-q-bg: #2a3340;
  --dfos-qa-mark: #5eb0ff;
  --dfos-a-border: rgba(94, 176, 255, 0.38);
  --dfos-range-track: #555;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--dfos-font);
  color: var(--dfos-text-body);
  background: var(--dfos-shell-bg);
}

body.dfos-article-body.briefing-page {
  background: var(--dfos-shell-bg) !important;
}

/* 全宽行：侧栏贴齐视口最左，主区占剩余空间 */
.dfos-page {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  width: 100%;
  min-height: 100vh;
}

/* 最左侧窄轨：预留多入口，目前仅「日报」；右侧投影仅在此列 */
.dfos-rail {
  flex: 0 0 72px;
  width: 72px;
  min-width: 72px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: var(--dfos-pad-top) 0 var(--dfos-pad-bottom);
  background: var(--dfos-rail-bg);
  border-right: none;
  font-family: var(--dfos-font);
  gap: 0;
  box-shadow: var(--dfos-rail-shadow);
  position: relative;
  z-index: 2;
}

.dfos-rail__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 52px;
  padding: 0;
  border-radius: 0;
  border: none;
  background: transparent;
  color: var(--dfos-text-body);
  text-decoration: none;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.2;
  transition: background 0.15s ease, color 0.15s ease;
  box-sizing: border-box;
}

.dfos-rail__item:hover {
  background: var(--dfos-rail-bg);
  color: var(--dfos-text-body);
}

.dfos-rail__item--active {
  background: var(--dfos-rail-active-bg) !important;
  border: none !important;
  color: var(--dfos-text-primary) !important;
}

.dfos-rail__icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2px;
  color: var(--dfos-text-muted);
}

.dfos-rail__item--active .dfos-rail__icon-wrap {
  color: var(--dfos-accent);
}

.dfos-rail__svg {
  display: block;
}

.dfos-rail__label {
  text-align: center;
  word-break: keep-all;
}

.sidebar {
  flex: 1 1 0;
  min-width: 0;
  border-right: none;
  padding: 0 0 var(--dfos-pad-bottom);
  background: var(--dfos-sidebar-bg);
  font-family: var(--dfos-font);
}

.dfos-catalog-head {
  padding: 28px 20px 20px;
}

.dfos-catalog-brand {
  margin: 0;
  font-family: var(--dfos-font-serif);
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: var(--dfos-briefing-h1-spacing);
  line-height: 1.2;
  color: var(--dfos-text-primary);
}

.dfos-main {
  flex: 3 1 0;
  min-width: 0;
  background: var(--dfos-content-bg);
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.dfos-main--solo {
  flex: 1 1 auto;
  width: 100%;
  background: var(--dfos-content-bg);
}

.dfos-main--with-rail {
  flex: 3 1 0;
  min-width: 0;
}

/* 正文栏：宽度在 960–1440 之间随父级伸缩 */
.dfos-text-rail {
  width: 100%;
  max-width: var(--dfos-max);
  min-width: var(--dfos-min);
  margin: 0 auto;
  flex: 1 1 auto;
}

.dfos-page--article .dfos-text-rail {
  margin: 0 auto;
}

/* 目录：白底侧栏上的浅灰行 + 行间分割；列表区透明 */
#date-list.dfos-date-list {
  padding: 0;
  margin: 0;
  list-style: none;
  border-radius: 0;
  overflow: hidden;
  border: none;
  background: transparent;
}

#date-list.dfos-date-list li {
  margin: 0;
  border-bottom: 1px solid var(--dfos-date-divider);
}

#date-list.dfos-date-list li:last-child {
  border-bottom: none;
}

.briefing-frame-wrap {
  width: 100%;
  min-height: 100vh;
}

.briefing-placeholder {
  margin: var(--dfos-pad-top) var(--dfos-content-pad-x) var(--dfos-pad-bottom);
  padding: 16px 20px;
  background: var(--dfos-content-bg);
  border: 1px solid var(--dfos-border);
  border-radius: var(--dfos-radius);
  color: var(--dfos-text-muted);
}

.briefing-frame {
  display: block;
  width: 100%;
  min-height: 480px;
  border: none;
  background: transparent;
}

.date-btn,
.btn {
  border: none;
  border-radius: 0;
  background: var(--dfos-date-row-bg);
  padding: 14px 20px;
  cursor: pointer;
  text-decoration: none;
  color: var(--dfos-text-body);
  width: 100%;
  text-align: left;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
  box-shadow: none;
  font-size: var(--dfos-briefing-h2-size);
  font-weight: var(--dfos-briefing-h2-weight);
  letter-spacing: var(--dfos-briefing-h2-spacing);
  line-height: var(--dfos-briefing-h2-line);
  font-family: var(--dfos-font-serif);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.date-btn__top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 10px;
  width: 100%;
}

.date-btn__primary {
  flex: 1 1 auto;
  min-width: 0;
  font-size: var(--dfos-briefing-h2-size);
  font-weight: var(--dfos-briefing-h2-weight);
  letter-spacing: var(--dfos-briefing-h2-spacing);
  line-height: var(--dfos-briefing-h2-line);
}

.date-btn__stat {
  flex: 0 0 auto;
  font-family: var(--dfos-font);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--dfos-text-muted);
  white-space: nowrap;
  line-height: 1.2;
}

.date-btn__deep {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  width: 100%;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: var(--dfos-briefing-h2-spacing);
  color: var(--dfos-text-muted);
}

.date-btn__no-deep {
  width: 100%;
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--dfos-text-muted);
  opacity: 0.92;
}

/* 未选中的日报行：整体灰阶，突出当前选中项 */
.date-btn:not(.date-btn--active) {
  color: var(--dfos-text-muted);
}

.date-btn:not(.date-btn--active) .date-btn__primary {
  color: var(--dfos-text-muted);
  opacity: 0.92;
}

.date-btn:not(.date-btn--active) .date-btn__stat {
  opacity: 0.72;
}

.date-btn:not(.date-btn--active) .date-btn__deep,
.date-btn:not(.date-btn--active) .date-btn__no-deep {
  opacity: 0.85;
}

.date-btn:hover:not(.date-btn--active),
.btn:hover {
  background: var(--dfos-nav-hover-bg);
}

html[data-theme="dark"] .date-btn:hover:not(.date-btn--active),
html[data-theme="dark"] .btn:hover {
  background: var(--dfos-nav-hover-bg);
}

/* 选中：浅色为纯白条（示意顶行）；深色模式为略亮底，无描边 */
.date-btn--active {
  background: var(--dfos-date-row-active) !important;
  box-shadow: none !important;
  color: var(--dfos-text-primary) !important;
}

.date-btn--active:hover {
  background: var(--dfos-date-row-active-hover) !important;
  box-shadow: none !important;
  color: var(--dfos-text-primary) !important;
}

.date-btn--active .date-btn__stat,
.date-btn--active .date-btn__deep,
.date-btn--active .date-btn__no-deep {
  color: var(--dfos-text-body);
  opacity: 1;
}

/* 文章正文：宋体栈（与侧栏标题层次一致） */
.dfos-article-prose,
.dfos-article-prose p,
.dfos-article-prose li,
.dfos-article-prose blockquote {
  font-family: var(--dfos-font-serif);
}

.dfos-player,
.dfos-player button,
.dfos-player .dfos-player-time,
.dfos-player .dfos-player-status {
  font-family: var(--dfos-font);
}

/* —— 结构化文章 Q/A（参考口播母本版式）—— */
.dfos-article-prose .dfos-qa {
  position: relative;
  margin: 28px 0;
}

.dfos-article-prose .dfos-qa-mark {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--dfos-qa-mark);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.dfos-article-prose .dfos-qa--q .dfos-qa-body {
  background: var(--dfos-qa-q-bg);
  border-radius: var(--dfos-radius);
  padding: 14px 18px;
  border: 1px solid var(--dfos-border);
}

.dfos-article-prose .dfos-qa--q .dfos-qa-body p {
  margin: 0;
}

.dfos-article-prose .dfos-qa--a .dfos-qa-body p {
  margin: 0;
}

.dfos-article-prose .dfos-qa--a-lead .dfos-qa-body {
  padding: 16px 18px;
  border-radius: var(--dfos-radius);
  border: 1px solid var(--dfos-a-border);
}

/* 答段内加粗 = 划重点（荧光笔） */
.dfos-article-prose .dfos-qa--a .dfos-qa-body strong {
  background: var(--dfos-key-bg);
  font-weight: 600;
  padding: 0 3px;
  border-radius: 2px;
}

.dfos-article-prose mark.dfos-key {
  background: var(--dfos-key-bg);
  color: inherit;
  font-weight: 600;
  padding: 0 3px;
  border-radius: 2px;
}

/* 开篇段落在首个 h2 前已由服务端转为 mark.dfos-key；未转换的加粗也可兼顾 */
.dfos-article-prose > p strong {
  background: var(--dfos-key-bg);
  font-weight: 600;
  padding: 0 3px;
  border-radius: 2px;
}

.dfos-article-container {
  max-width: none !important;
  padding: var(--dfos-pad-top) var(--dfos-content-pad-x) var(--dfos-pad-bottom) !important;
  box-sizing: border-box;
}

/* 去掉 Markdown 水平分割线 */
.dfos-article-prose hr {
  display: none;
  margin: 0;
  height: 0;
  border: 0;
  visibility: hidden;
}

.dfos-article-main {
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
  margin: 0;
}

.dfos-back-row {
  margin: 0 0 12px;
}

.dfos-back-link {
  font-size: 15px;
  font-weight: 600;
  color: var(--dfos-accent);
  text-decoration: none;
}

.dfos-back-link:hover {
  color: var(--dfos-accent-hover);
  text-decoration: underline;
}

/* —— 自定义语音条（第三张参考：状态 + 圆角控制条）—— */
.dfos-player {
  margin: 16px 0 32px;
  position: relative;
}

.dfos-player-row {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 24px;
}

.dfos-player-status {
  font-size: 14px;
  color: var(--dfos-text-muted);
  line-height: 1.4;
}

.dfos-player-chrome {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px;
  padding: 14px 24px;
  background: var(--dfos-content-bg);
  border: 1px solid var(--dfos-border);
  border-radius: var(--dfos-radius);
  box-shadow: none;
}

.dfos-player-chrome--disabled {
  opacity: 0.55;
  pointer-events: none;
}

.dfos-player-chrome--ready {
  opacity: 1;
  pointer-events: auto;
}

.dfos-player-play {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--dfos-accent);
  background: var(--dfos-content-bg);
  color: var(--dfos-accent);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.dfos-player-play:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  border-color: var(--dfos-border);
  color: var(--dfos-text-muted);
}

.dfos-player-icon-svg {
  display: block;
  flex-shrink: 0;
}

.dfos-player-time {
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--dfos-text-muted);
  min-width: 88px;
  flex-shrink: 0;
}

/* 进度/音量：浅灰轨道 + 线性自定义滑块（淡化系统默认深色条） */
.dfos-player-scrub,
.dfos-player-vol {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
}

.dfos-player-scrub {
  flex: 1 1 140px;
  min-width: 120px;
  height: 20px;
}

.dfos-player-scrub:disabled,
.dfos-player-vol:disabled {
  cursor: not-allowed;
}

.dfos-player-scrub::-webkit-slider-runnable-track,
.dfos-player-vol::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--dfos-range-track);
  border-radius: 2px;
}

.dfos-player-scrub::-webkit-slider-thumb,
.dfos-player-vol::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--dfos-accent);
  border: 2px solid var(--dfos-content-bg);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06);
}

.dfos-player-scrub::-moz-range-track,
.dfos-player-vol::-moz-range-track {
  height: 4px;
  background: var(--dfos-range-track);
  border-radius: 2px;
}

.dfos-player-scrub::-moz-range-thumb,
.dfos-player-vol::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--dfos-accent);
  border: 2px solid var(--dfos-content-bg);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06);
}

.dfos-player-vol {
  width: 72px;
  min-width: 72px;
  height: 20px;
  flex-shrink: 0;
}

.dfos-player-ff {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--dfos-radius);
  border: 1px solid var(--dfos-border);
  background: var(--dfos-content-bg);
  cursor: pointer;
  color: var(--dfos-text-body);
}

.dfos-player-ff:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.dfos-player-vol-wrap {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  flex-shrink: 0;
  color: var(--dfos-text-body);
  cursor: default;
}

.dfos-player-vol-wrap .dfos-player-icon-svg--vol {
  color: var(--dfos-text-muted);
}

.dfos-audio-el {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}

.dfos-theme-toggle {
  position: fixed;
  top: 16px;
  right: 20px;
  z-index: 9999;
  width: 44px;
  height: 44px;
  border-radius: var(--dfos-radius);
  border: 1px solid var(--dfos-border);
  background: var(--dfos-content-bg);
  color: var(--dfos-text-body);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.dfos-theme-toggle:hover {
  background: var(--dfos-nav-hover-bg);
  border-color: rgba(0, 149, 255, 0.35);
}

html[data-theme="dark"] .dfos-theme-toggle:hover {
  border-color: rgba(94, 176, 255, 0.35);
}

.dfos-theme-toggle__icon {
  display: block;
}

/* 文章页：覆盖 briefing.css 的 Notion 色，随主题切换 */
html[data-theme="dark"] body.dfos-article-body.briefing-page {
  background: var(--dfos-shell-bg) !important;
  color: var(--dfos-text-body) !important;
}

html[data-theme="dark"] .dfos-article-body .briefing-prose,
html[data-theme="dark"] .dfos-article-body .briefing-prose li,
html[data-theme="dark"] .dfos-article-body .briefing-prose p {
  color: var(--dfos-text-body) !important;
}

html[data-theme="dark"] .dfos-article-body .briefing-prose h1,
html[data-theme="dark"] .dfos-article-body .briefing-prose h2,
html[data-theme="dark"] .dfos-article-body .briefing-prose h3 {
  color: var(--dfos-text-primary) !important;
}

html[data-theme="dark"] .dfos-article-body .briefing-prose a {
  color: var(--dfos-accent) !important;
}

@media (max-width: 900px) {
  .dfos-page {
    flex-direction: column;
  }

  .dfos-rail {
    flex-direction: row;
    flex: 0 0 auto;
    width: 100%;
    min-width: 0;
    justify-content: flex-start;
    align-items: center;
    padding: 12px 16px;
    gap: 12px;
    border-bottom: 1px solid var(--dfos-border);
    box-shadow: var(--dfos-rail-shadow-mobile);
  }

  .dfos-rail__item {
    flex-direction: row;
    width: auto;
    min-height: 0;
    padding: 8px 12px;
  }

  .dfos-rail__icon-wrap {
    margin-bottom: 0;
    margin-right: 6px;
  }

  .sidebar {
    flex: none;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--dfos-border);
  }

  .dfos-catalog-head {
    padding: 22px 16px 18px;
  }

  .dfos-text-rail {
    min-width: 0;
    max-width: 100%;
  }
}