/* ==========================================================================
   AI 时刻（AI Moment）· 全站设计系统
   双栏文档布局（左目录 / 右正文）+ 固定导航 + 顶部广告位 + Ctrl/Cmd+F 查询（词语定位 + AI 解答）
   配色：清华紫体系（主色 #660874，深色 #4a065e，浅色 tint #f7f0fa）
   ========================================================================== */

:root {
  /* ---- 紫墨纸感：清华学生的研究、阅读与协作空间 ---- */
  --paper: #f8f5fa;
  --white: #fff;
  --ink: #28163a;
  --ink-2: #4a365d;
  --muted: #756584;
  --muted-2: #907f9e;
  --line: #e5ddea;
  --line-strong: #d4c6dc;

  /* ---- 清华紫：唯一的品牌强调色 ---- */
  --primary: #660874;
  --primary-dark: #4a065e;
  --primary-deep: #32113f;
  --primary-soft: #f7f0fa;
  --primary-mist: #ead7f0;
  --primary-line: rgba(102, 8, 116, .24);

  /* ---- 语义色（成功 / 警告 / 错误保持不变） ---- */
  --mint: #14b982;
  --mint-soft: #dff8ed;
  --amber: #b7791f;
  --amber-soft: #fff8e1;
  --amber-line: #fde68a;
  --red: #b91c1c;
  --red-soft: #fef2f2;
  --red-line: #fecaca;
  --green: #0a7d4f;
  --green-soft: #ecfdf5;
  --green-line: #a7f3d0;
  --mark: #ffe58f;

  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --shadow-sm: 0 8px 24px rgba(57, 23, 76, .06);
  --shadow-md: 0 16px 40px rgba(57, 23, 76, .1);
  --shadow-lg: 0 28px 70px rgba(57, 23, 76, .14);

  --nav-h: 68px;
  --ad-h: 68px;
  --ad-offset: 0px;          /* 广告条实际占位高度：html.has-ad 时等于 --ad-h */
  /* 全站统一流式容器：不设桌面宽度上限，随浏览器窗口伸缩，仅保留两侧安全边距。 */
  --page-max: 80vw;

  --sans: "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Noto Sans SC", "Source Han Sans CN", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", "Microsoft YaHei", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(108px + var(--ad-offset)); }
/* 广告条上线时只改这一个变量，全部偏移量自动跟随，无需逐条覆盖 */
html.has-ad { --ad-offset: var(--ad-h); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; }
h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; }
::selection { color: var(--ink); background: #e9c9f3; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed; top: 10px; left: 12px; z-index: 1200;
  padding: 10px 14px; border-radius: 8px;
  color: #fff; background: var(--ink);
  transform: translateY(-180%); transition: transform .2s;
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid rgba(102, 8, 116, .35); outline-offset: 3px; }

/* --------------------------------------------------------------------------
   顶部导航
   -------------------------------------------------------------------------- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  /* 高度含自身 1px 底边框，底边正好落在 var(--nav-h)，广告条才能无缝衔接 */
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition: background-color .25s, border-color .25s, box-shadow .25s;
}
.site-nav.scrolled {
  background: rgba(248, 245, 250, .88);
  border-color: rgba(212, 201, 221, .8);
  box-shadow: 0 10px 30px rgba(46, 16, 58, .05);
  backdrop-filter: blur(18px);
}
.nav-shell {
  width: var(--page-max); margin-inline: auto;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; flex: none; }
.brand-mark {
  width: 34px; height: 34px; flex: none;
  display: grid; place-items: center;
  border-radius: 10px; color: #fff;
  background: linear-gradient(150deg, var(--primary), var(--primary-dark));
  box-shadow: 0 8px 20px rgba(74, 6, 94, .28);
}
.brand-mark svg { width: 18px; height: 18px; }
/* 品牌 logo：生成式「知识网络」标记，加载失败时保留闪电 SVG 回退 */
.brand-mark { position: relative; overflow: hidden; }
.brand-mark img {
  position: absolute; inset: 0; z-index: 1;
  width: 100%; height: 100%; object-fit: cover;
  border-radius: inherit; display: block;
}
.brand-name { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name b { font-size: 15.5px; font-weight: 760; letter-spacing: -.02em; }
.brand-name span {
  color: var(--muted);
  font: 700 9.5px/1.4 var(--mono);
  letter-spacing: .14em; text-transform: uppercase;
}

.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links > a:not(.nav-cta) {
  color: #584c63; font-size: 14px; font-weight: 600; transition: color .2s;
}
.nav-links > a:not(.nav-cta):hover { color: var(--primary); }
.nav-links > a:not(.nav-cta).current { color: var(--ink); }
.nav-links > a:not(.nav-cta).current::after {
  content: ""; display: block; height: 2px; margin-top: 2px;
  border-radius: 2px; background: var(--primary);
}

.nav-search-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 12px; cursor: pointer;
  border: 1px solid var(--line-strong); border-radius: 9px;
  color: var(--muted); background: rgba(255, 255, 255, .66);
  font-size: 13px; font-weight: 600;
  transition: border-color .2s, color .2s, background-color .2s;
}
.nav-search-btn:hover { color: var(--primary-dark); border-color: #d9bfe6; background: #fff; }
.nav-search-btn svg { width: 15px; height: 15px; flex: none; }
.nav-search-btn kbd {
  padding: 1px 5px; border: 1px solid var(--line);
  border-radius: 4px; background: #f8f3fb; color: #887c92;
  font: 700 9.5px var(--mono); letter-spacing: .04em;
}

.nav-user { display: flex; align-items: center; gap: 10px; }
.nav-user .user-email {
  max-width: 190px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: var(--muted); font: 600 12px var(--mono);
  text-decoration: none; cursor: pointer; transition: color .2s;
}
.nav-user .user-email:hover { color: var(--primary); }
.role-pill {
  flex: none; padding: 3px 10px;
  border: 1px solid var(--primary-line); border-radius: 999px;
  color: var(--primary-dark); background: var(--primary-mist);
  font: 700 10px var(--mono); letter-spacing: .08em;
}
.role-pill[data-role="admin"] { color: #0b6b4c; border-color: rgba(20, 185, 130, .3); background: var(--mint-soft); }
.role-pill[data-role="viewer"] { color: #6a5f73; border-color: var(--line-strong); background: #f3edf6; }

.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 15px; cursor: pointer;
  border: 1px solid rgba(35, 16, 40, .14); border-radius: 9px;
  color: #fff; background: var(--ink);
  font-size: 13.5px; font-weight: 700;
  box-shadow: 0 8px 20px rgba(35, 16, 40, .14);
  transition: background-color .2s, transform .2s;
}
.nav-cta:hover { background: #3a0e44; transform: translateY(-1px); }
.nav-cta.ghost {
  color: var(--ink); border-color: var(--line-strong);
  background: rgba(255, 255, 255, .7); box-shadow: none;
}
.nav-cta.ghost:hover { border-color: #c8b7d3; background: #fff; }

.menu-toggle { display: none; width: 44px; height: 44px; border: 0; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 22px; height: 2px; margin: 5px auto; border-radius: 99px; background: var(--ink); transition: transform .2s; }

/* --------------------------------------------------------------------------
   通用按钮 / 表单 / 提示
   -------------------------------------------------------------------------- */
.btn {
  min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; cursor: pointer;
  border: 1px solid transparent; border-radius: var(--radius-sm);
  font-size: 14.5px; font-weight: 700; line-height: 1;
  transition: background-color .2s, border-color .2s, color .2s, transform .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-primary { color: #fff; background: var(--primary); box-shadow: 0 12px 26px rgba(102, 8, 116, .24); }
.btn-primary:hover { background: var(--primary-dark); box-shadow: 0 16px 34px rgba(102, 8, 116, .3); }
.btn-secondary { color: var(--ink); border-color: var(--line-strong); background: rgba(255, 255, 255, .8); }
.btn-secondary:hover { border-color: #c8b7d3; background: #fff; }
.btn-dark { color: #fff; border-color: var(--ink); background: var(--ink); }
.btn-dark:hover { color: #fff; border-color: var(--primary-dark); background: var(--primary-dark); }
.btn-block { width: 100%; }
.btn-sm { min-height: 36px; padding: 8px 14px; font-size: 13px; border-radius: 8px; }

.field { display: block; }
.field > label {
  display: block; margin-bottom: 6px;
  color: #4d4156; font: 700 10.5px var(--mono); letter-spacing: .1em; text-transform: uppercase;
}
.field input, .field textarea, .field select {
  width: 100%; padding: 11px 13px;
  border: 1px solid var(--line); border-radius: 9px;
  color: var(--ink); background: #faf7fc;
  font: 14px var(--sans);
  transition: border-color .2s, box-shadow .2s, background-color .2s;
}
.field textarea { min-height: 84px; resize: vertical; line-height: 1.7; }
.field input:hover, .field textarea:hover { border-color: var(--line-strong); }
.field input:focus, .field textarea:focus, .field select:focus {
  outline: 0; border-color: rgba(102, 8, 116, .5);
  background: #fff; box-shadow: 0 0 0 3px rgba(102, 8, 116, .09);
}
.field .hint { margin-top: 5px; color: var(--muted-2); font-size: 12px; }
.field .hint.err { color: var(--red); }
/* 行内字段（邮箱 + 发送验证码按钮） */
.field-row { display: flex; gap: 8px; align-items: stretch; }
.field-row > input { flex: 1 1 auto; min-width: 0; height: 46px; }
.field-row .btn-send-code {
  flex: none; height: 46px; min-height: 46px; padding: 0 14px; white-space: nowrap;
  font-size: 13px; font-weight: 700;
}
.field-row .btn-send-code:disabled { cursor: not-allowed; opacity: .7; }
@media (max-width: 480px) {
  .field-row { flex-direction: column; }
  .field-row .btn-send-code { width: 100%; }
  /* 认证弹窗的验证码操作需要与邮箱保持同一行，避免移动端视觉断裂。 */
  #loginModal .field-row, #siteAuthModal .field-row { flex-direction: row; }
  #loginModal .field-row .btn-send-code, #siteAuthModal .field-row .btn-send-code {
    width: auto; flex: 0 0 auto; padding-inline: 11px; font-size: 12px;
  }
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
.form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 18px; }

.msg { display: none; margin-top: 14px; padding: 12px 15px; border-radius: var(--radius-sm); font-size: 13.5px; line-height: 1.7; }
.msg.show { display: block; }
.msg.success { color: var(--green); border: 1px solid var(--green-line); background: var(--green-soft); }
.msg.error { color: var(--red); border: 1px solid var(--red-line); background: var(--red-soft); }
.msg.info { color: var(--primary-dark); border: 1px solid var(--primary-line); background: var(--primary-soft); }

.status-text { color: var(--muted); font: 600 12px var(--mono); }
.status-text.ok { color: var(--green); }
.status-text.err { color: var(--red); }

/* --------------------------------------------------------------------------
   文档页布局
   -------------------------------------------------------------------------- */
.docs-body { display: flex; flex-direction: column; min-height: 100vh; }
/* --------------------------------------------------------------------------
   顶部赞助位：固定于导航下方，仅管理员可更新或下线
   -------------------------------------------------------------------------- */
.ad-bar {
  position: fixed; top: var(--nav-h); left: 0; right: 0; z-index: 95;
  height: var(--ad-h); display: flex; align-items: center;
  background: linear-gradient(90deg, var(--primary-deep), #3a1045 58%, #441352);
  border-bottom: 1px solid rgba(255, 255, 255, .07);
  color: #f3e9f7;
}
.ad-shell {
  width: var(--page-max); margin-inline: auto;
  display: flex; align-items: center; gap: 14px; min-width: 0;
}
.ad-shell.has-carousel { gap: 6px; }
.ad-logo {
  flex: none; width: 44px; height: 44px; padding: 4px;
  object-fit: contain; border: 1px solid rgba(255, 255, 255, .2); border-radius: 8px;
  background: rgba(255, 255, 255, .96); box-shadow: 0 5px 18px rgba(0, 0, 0, .16);
}
.ad-tag {
  flex: none; padding: 3px 7px; border-radius: 5px;
  background: rgba(255, 255, 255, .13); color: #e8d1f4;
  font: 700 9.5px var(--mono); letter-spacing: .14em; text-transform: uppercase;
}
.ad-text {
  flex: 1 1 auto; min-width: 0;
  display: -webkit-box; overflow: hidden; -webkit-box-orient: vertical; -webkit-line-clamp: 2;
  font-size: 13px; font-weight: 500; line-height: 1.5;
}
.ad-cta {
  flex: none; display: inline-flex; align-items: center; gap: 5px; padding: 7px 10px;
  border: 1px solid rgba(255, 255, 255, .16); color: #fff; background: rgba(255, 255, 255, .1);
  font-size: 12.5px; font-weight: 600; text-decoration: none; transition: background-color .2s, color .2s;
}
.ad-cta:hover { color: #fff; background: rgba(255, 255, 255, .2); }
.ad-cta svg { width: 12px; height: 12px; flex: none; }
.ad-cta-secondary {
  color: #eedcf3; border-color: rgba(255, 255, 255, .11); background: transparent;
}
.ad-cta-secondary:hover { color: #fff; background: rgba(255, 255, 255, .12); }
.ad-manage {
  flex: none; padding: 4px 11px; cursor: pointer;
  border: 1px solid rgba(255, 255, 255, .22); border-radius: 7px;
  background: transparent; color: #e6d3f0;
  font: 600 11px var(--sans); transition: background-color .2s, color .2s;
}
.ad-manage:hover { background: rgba(255, 255, 255, .12); color: #fff; }
.ad-close {
  flex: none; width: 24px; height: 24px; margin-left: 4px;
  display: flex; align-items: center; justify-content: center;
  padding: 0; cursor: pointer;
  border: 0; border-radius: 50%; background: transparent;
  color: #e8d1f4; font: 600 16px/1 var(--sans);
  transition: background-color .2s, color .2s;
}
.ad-close:hover { background: rgba(255, 255, 255, .18); color: #fff; }
.ad-bar.is-hidden { display: none; }

/* 一个项目一屏：横向滚动而非把多个项目拼入同一句文案。 */
.ad-carousel { flex: 1 1 auto; min-width: 0; position: relative; }
.ad-viewport { overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none; }
.ad-viewport::-webkit-scrollbar { display: none; }
.ad-track { display: flex; width: 100%; }
.ad-slide {
  flex: 0 0 100%; min-width: 0; display: flex; align-items: center; gap: 12px;
  padding-right: 4px; scroll-snap-align: start;
}
.ad-slide .ad-logo { width: 42px; height: 42px; }
.ad-project-copy { flex: 1 1 auto; min-width: 0; display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: 9px; align-items: baseline; }
.ad-project-index { color: #d9a8e7; font: 700 9px var(--mono); letter-spacing: .12em; text-transform: uppercase; white-space: nowrap; }
.ad-project-title { min-width: 0; color: #fff; font-size: 13px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ad-project-copy .ad-text { grid-column: 1 / -1; display: block; margin-top: 2px; color: #eadbf0; font-size: 11.5px; line-height: 1.35; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ad-slide .ad-cta { margin-left: auto; white-space: nowrap; }
.ad-cycle {
  flex: none; height: 28px; padding: 0 8px; cursor: pointer;
  border: 1px solid rgba(255, 255, 255, .16); border-radius: 5px;
  background: transparent; color: #e8d1f4; font: 600 10.5px var(--sans);
  white-space: nowrap; transition: background-color .2s, color .2s;
}
.ad-cycle:hover { background: rgba(255, 255, 255, .12); color: #fff; }

/* 赞助条占用的高度由 --ad-offset 统一补偿：正文内边距、目录吸顶位、查询浮层与锚点偏移
   均基于该变量计算，因此在任何断点下都能自动跟随，不会与响应式规则争优先级。 */

@media (max-width: 620px) {
  :root { --ad-h: 78px; }
  .ad-tag { display: none; }
  .ad-shell { display: grid; grid-template-columns: minmax(0, 1fr) auto auto 24px; gap: 6px 7px; align-items: center; }
  .ad-logo { width: 42px; height: 42px; }
  .ad-logo { grid-row: 1 / 3; }
  .ad-text { grid-column: 1 / -1; font-size: 12px; }
  .ad-logo + .ad-tag + .ad-text { grid-column: 2 / -1; }
  .ad-manage { padding: 3px 9px; font-size: 10.5px; }
  .ad-cta { padding: 6px 8px; font-size: 11.5px; }
  .ad-cta-secondary { padding-inline: 7px; }
  .ad-close { grid-column: 4; grid-row: 2; margin-left: 0; }
  .ad-shell { display: flex; gap: 8px; }
  .ad-shell.has-carousel { gap: 4px; }
  .ad-slide { gap: 8px; padding-right: 4px; }
  .ad-slide .ad-logo { width: 38px; height: 38px; }
  .ad-slide .ad-tag { display: none; }
  .ad-project-copy { grid-template-columns: minmax(0, 1fr); }
  .ad-project-index { display: none; }
  .ad-project-title { font-size: 12px; }
  .ad-project-copy .ad-text { font-size: 10.5px; }
  .ad-slide .ad-cta { padding: 6px 7px; font-size: 10.5px; }
  .ad-cycle { width: 24px; height: 24px; padding: 0; font-size: 0; }
  .ad-cycle::after { content: '↻'; font: 16px/1 var(--sans); }
}

.doc-main { flex: 1; padding: calc(126px + var(--ad-offset)) 0 90px; }
.doc-shell {
  width: var(--page-max); margin-inline: auto;
  display: grid; grid-template-columns: clamp(224px, 22vw, 280px) minmax(0, 1fr);
  gap: clamp(40px, 5vw, 84px); align-items: start;
}
.doc-shell--feed { grid-template-columns: minmax(0, 760px); justify-content: center; }
.doc-shell--feed .doc-content { width: 100%; }

/* 广场、动态和专业文章共用同一条内容轨道与页首节奏。 */
.unified-shell { width: 80%; margin-inline: auto; }
.doc-shell.doc-shell--feed.unified-shell { grid-template-columns: minmax(0, 1fr); justify-content: stretch; }
.doc-header.unified-page-head,
.art-head.unified-page-head {
  position: static; margin-bottom: 26px; padding: 0 0 0 clamp(18px, 2vw, 28px);
  border: 0; border-left: 2px solid var(--primary-line);
}
.doc-header.unified-page-head::before { display: none; }
.unified-page-head h1,
.unified-page-head .doc-title {
  margin: 10px 0 12px; font-size: clamp(30px, 4vw, 44px);
  font-weight: 700; letter-spacing: -.01em;
}
.unified-page-head .doc-lede { max-width: none; color: var(--muted); font-size: 15px; line-height: 1.8; }

/* 左侧目录 */
.doc-toc {
  position: sticky; top: calc(108px + var(--ad-offset));
  max-height: calc(100vh - 132px - var(--ad-offset));
  display: flex; flex-direction: column; gap: 16px;
  overflow: hidden; padding: 20px 18px 18px;
  border: 1px solid var(--line-strong); border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .72);
  box-shadow: var(--shadow-sm); backdrop-filter: blur(5px);
}
.doc-toc-label {
  color: var(--primary-dark);
  font: 700 10px var(--mono); letter-spacing: .12em; text-transform: uppercase;
}
.doc-toc-nav {
  min-height: 0; flex: 1; display: flex; flex-direction: column; gap: 2px;
  padding-right: 4px; overflow-y: auto; overscroll-behavior: contain;
  scrollbar-width: thin; scrollbar-color: #d0c1da transparent;
}
.doc-toc-nav::-webkit-scrollbar { width: 5px; }
.doc-toc-nav::-webkit-scrollbar-thumb { border-radius: 999px; background: #d0c1da; }
.doc-toc-nav a {
  padding: 6px 10px;
  border-left: 2px solid transparent; border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  color: #5d5266; font-size: 12.5px; font-weight: 600; line-height: 1.45;
  transition: color .2s, border-color .2s, background-color .2s;
}
.doc-toc-nav a:hover { color: var(--ink); background: rgba(102, 8, 116, .05); }
.doc-toc-nav a.current { color: var(--primary-dark); border-left-color: var(--primary); background: var(--primary-mist); }
.doc-toc-nav a.toc-h2 { font-weight: 700; }
.doc-toc-nav a.toc-h3 { padding-left: 24px; color: var(--muted-2); font-size: 12px; font-weight: 500; }
.doc-toc-nav .toc-empty { padding: 6px 10px; color: var(--muted-2); font-size: 12px; }
.doc-toc-skeleton { display: flex; flex-direction: column; gap: 10px; }
.doc-toc-skeleton span { height: 12px; border-radius: 4px; background: var(--line); animation: toc-pulse 1.2s ease-in-out infinite; }
.doc-toc-skeleton span:nth-child(2) { width: 82%; animation-delay: .12s; }
.doc-toc-skeleton span:nth-child(3) { width: 70%; animation-delay: .24s; }
.doc-toc-skeleton span:nth-child(4) { width: 88%; animation-delay: .36s; }
.doc-toc-skeleton span:nth-child(5) { width: 62%; animation-delay: .48s; }
.doc-toc-skeleton span:nth-child(6) { width: 76%; animation-delay: .6s; }
@keyframes toc-pulse { 0%, 100% { opacity: .45; } 50% { opacity: 1; } }
.doc-toc-foot { margin: 6px 0 0; padding-top: 14px; border-top: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 6px; }
.doc-toc-foot a {
  color: var(--muted); font: 600 11px var(--mono); letter-spacing: .04em; transition: color .2s;
}
.doc-toc-foot a:hover { color: var(--primary-dark); }

/* 右侧正文 */
.doc-content { min-width: 0; max-width: none; }
.doc-header { margin-bottom: 40px; padding-bottom: 28px; border-bottom: 1px solid var(--line-strong); }
.section-label {
  margin: 0 0 18px; color: var(--primary-dark);
  font: 700 11px var(--mono); letter-spacing: .12em; text-transform: uppercase;
}
.doc-title {
  font-size: clamp(2.1rem, 3.6vw, 3.1rem); font-weight: 700;
  line-height: 1.12; letter-spacing: -.045em;
}
.doc-lede { margin-top: 16px; max-width: none; color: var(--muted); font-size: 15.5px; line-height: 1.85; }
.doc-lede a { color: var(--primary-dark); font-weight: 600; border-bottom: 1px solid rgba(74, 6, 94, .3); }
.doc-lede a:hover { border-bottom-color: var(--primary); }
.doc-search-hint {
  display: flex; align-items: center; flex-wrap: wrap; gap: 5px;
  margin-top: 18px; color: var(--muted); font-size: 12px;
}
.doc-search-hint kbd {
  min-width: 26px; padding: 2px 6px; text-align: center;
  border: 1px solid var(--line-strong); border-bottom-color: #c8b7d3; border-radius: 5px;
  color: #4d4156; background: #fff; box-shadow: 0 2px 0 #e3d9ea;
  font: 700 10px var(--mono);
}
/* 标题区查询入口：外观保持提示行质感，实际是可点击按钮 */
.doc-search-hint-btn {
  display: inline-flex; align-items: center; flex-wrap: wrap; gap: 5px;
  padding: 0; border: 0; background: none; cursor: pointer;
  color: inherit; font: inherit; text-align: left;
}
.doc-search-hint-btn:hover { color: var(--primary-dark); }
.doc-search-hint-btn:hover kbd { border-color: var(--primary); color: var(--primary-dark); }
.doc-search-hint-btn:focus-visible { outline: 2px solid rgba(102, 8, 116, .45); outline-offset: 3px; border-radius: 4px; }

/* --------------------------------------------------------------------------
   Ctrl/Cmd + F 文档查询：词语定位 + AI 解答
   -------------------------------------------------------------------------- */
.doc-search {
  position: fixed; z-index: 110; top: calc(92px + var(--ad-offset)); left: 50%;
  width: min(760px, calc(100vw - 32px));
  overflow: hidden; transform: translateX(-50%);
  border: 1px solid var(--line-strong); border-radius: 14px;
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 24px 70px rgba(43, 10, 51, .2);
  backdrop-filter: blur(18px);
}
.doc-search-bar { min-height: 58px; display: flex; align-items: center; gap: 10px; padding: 9px; }
.doc-search-field {
  min-width: 0; flex: 1; display: flex; align-items: center; gap: 9px;
  padding: 0 11px; border: 1px solid var(--line); border-radius: 9px;
  color: var(--muted-2); background: #faf7fc;
}
.doc-search-field:focus-within { border-color: rgba(102, 8, 116, .5); box-shadow: 0 0 0 3px rgba(102, 8, 116, .09); }
.doc-search-field svg { width: 16px; height: 16px; flex: none; }
.doc-search-field input {
  min-width: 0; flex: 1; height: 38px; border: 0; outline: 0;
  color: var(--ink); background: transparent; font: 13.5px var(--sans);
}
.doc-search-field input::-webkit-search-cancel-button { display: none; }
.doc-search-count { flex: none; color: #887c92; font: 600 10px var(--mono); }
.doc-search-actions { display: flex; align-items: center; gap: 5px; }
.doc-search-actions button, .doc-search-terms button {
  min-width: 36px; height: 38px; padding: 0 10px; cursor: pointer;
  border: 1px solid var(--line); border-radius: 8px;
  color: #5e5367; background: #fff; font-size: 13px; font-weight: 700;
  transition: color .2s, border-color .2s, background-color .2s;
}
.doc-search-actions button:hover, .doc-search-terms button:hover {
  color: var(--primary-dark); border-color: #d9bfe6; background: #f4edf8;
}
.doc-search-actions .doc-search-ai { min-width: 76px; color: #fff; border-color: var(--ink); background: var(--ink); }
.doc-search-actions .doc-search-ai:hover { color: #fff; border-color: var(--primary-dark); background: var(--primary-dark); }
.doc-search-actions .doc-search-ai:disabled { cursor: wait; opacity: .58; }
.doc-search-answer {
  max-height: min(42vh, 330px); padding: 18px 20px 20px; overflow-y: auto;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(250, 247, 252, .96), rgba(255, 255, 255, .98));
}
.doc-search-answer-head { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
.doc-search-answer-head span { color: var(--primary-dark); font: 800 9px var(--mono); letter-spacing: .12em; }
.doc-search-answer-head strong { color: #5e5367; font-size: 12px; }
.doc-search-answer > p { margin: 10px 0 0; color: var(--ink-2); font-size: 13.5px; line-height: 1.85; white-space: pre-wrap; }
.doc-search-terms { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 13px; }
.doc-search-terms button { height: 30px; padding-inline: 9px; color: var(--primary-dark); font-size: 10.5px; }
.doc-search-locate {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 13px; padding: 6px 11px;
  border: 1px solid var(--primary-line); border-radius: 999px; cursor: pointer;
  color: var(--primary-dark); background: var(--primary-mist);
  font: 700 11px var(--mono); letter-spacing: .04em;
  transition: background-color .2s, border-color .2s;
}
.doc-search-locate:hover { border-color: var(--primary); background: #e3c9ee; }
mark.doc-find-match {
  padding: 0 1px; border-radius: 2px; color: inherit;
  background: var(--mark); box-shadow: inset 0 -1px rgba(132, 91, 0, .18);
}
mark.doc-find-match.current { color: #fff; background: var(--primary-dark); box-shadow: 0 0 0 2px rgba(102, 8, 116, .2); }

/* --------------------------------------------------------------------------
   Markdown 排版
   -------------------------------------------------------------------------- */
.doc-markdown { color: var(--ink-2); font-size: 15px; line-height: 1.85; }
.doc-markdown h1 {
  margin: 0 0 18px; color: var(--ink);
  font-size: clamp(1.7rem, 2.8vw, 2.2rem); font-weight: 700; line-height: 1.25; letter-spacing: -.04em;
  scroll-margin-top: 108px;
}
.doc-markdown h2 {
  margin: 56px 0 20px; color: var(--ink);
  font-size: clamp(1.45rem, 2.3vw, 1.85rem); font-weight: 700; line-height: 1.3; letter-spacing: -.035em;
  scroll-margin-top: 108px;
}
.doc-markdown h2:first-child { margin-top: 0; }
.doc-markdown h3 {
  margin: 38px 0 14px; color: var(--ink);
  font-size: 1.12rem; font-weight: 700; letter-spacing: -.02em;
  scroll-margin-top: 108px;
}
.doc-markdown h4 {
  margin: 26px 0 10px; color: #4a3a54;
  font-size: .98rem; font-weight: 700; letter-spacing: -.01em;
  scroll-margin-top: 108px;
}
.doc-markdown p { margin: 14px 0; max-width: none; }
.doc-markdown ul, .doc-markdown ol { margin: 14px 0; }
.doc-markdown ul { padding-left: 6px; list-style: none; }
.doc-markdown ul li { position: relative; padding: 3px 0 3px 24px; }
.doc-markdown ul li::before {
  content: ""; position: absolute; left: 2px; top: .78em;
  width: 7px; height: 7px; border-radius: 2px;
  background: var(--primary); box-shadow: 0 0 0 3px var(--primary-mist);
}
.doc-markdown ol { padding-left: 24px; }
.doc-markdown ol li { padding: 3px 0; }
.doc-markdown ol li::marker { color: var(--primary-dark); font: 700 12px var(--mono); }
.doc-markdown li > ul, .doc-markdown li > ol { margin: 6px 0; }
.doc-markdown blockquote {
  margin: 20px 0; padding: 16px 20px;
  border-left: 3px solid var(--primary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(102, 8, 116, .05);
}
.doc-markdown blockquote p { margin: 6px 0; }
.doc-markdown strong { color: var(--ink); }
.doc-markdown a {
  color: var(--primary-dark); font-weight: 600;
  border-bottom: 1px solid rgba(74, 6, 94, .3); transition: border-color .2s;
}
.doc-markdown a:hover { border-bottom-color: var(--primary); }
.doc-markdown code {
  padding: 2px 7px; border: 1px solid var(--line); border-radius: 5px;
  background: #f8f3fb; color: #5d0a6b;
  font-family: var(--mono); font-size: .86em;
}
.doc-markdown pre {
  margin: 20px 0; padding: 18px 20px; overflow-x: auto;
  border: 1px solid #46204f; border-radius: 14px;
  color: #efdcf6; background: var(--primary-deep);
  box-shadow: 0 18px 44px rgba(43, 10, 51, .16);
  font: 12.5px/1.85 var(--mono);
}
.doc-markdown pre code { padding: 0; border: 0; background: none; color: inherit; font-size: inherit; }
.doc-markdown hr { margin: 44px 0; border: 0; border-top: 1px solid var(--line-strong); }
.doc-markdown mark { padding: 0 2px; border-radius: 3px; background: var(--mark); color: inherit; }
.doc-table-wrap {
  margin: 22px 0; overflow-x: auto;
  border: 1px solid var(--line-strong); border-radius: 12px;
  background: rgba(255, 255, 255, .85); box-shadow: var(--shadow-sm);
}
.doc-markdown table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.doc-markdown thead th {
  padding: 11px 16px; text-align: left; white-space: nowrap;
  border-bottom: 1px solid var(--line-strong); background: #faf5fc;
  color: var(--primary-dark); font: 700 11px var(--mono); letter-spacing: .06em;
}
.doc-markdown tbody td { padding: 10px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc-markdown tbody tr:last-child td { border-bottom: 0; }
.doc-markdown tbody tr:hover td { background: rgba(102, 8, 116, .04); }
.doc-loading, .doc-empty { color: var(--muted); font-size: 14px; }
.doc-empty { padding: 34px 0; }

/* --------------------------------------------------------------------------
   编辑工具条 / 编辑器
   -------------------------------------------------------------------------- */
.doc-toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin: 0 0 26px; }
.doc-toolbar .spacer { flex: 1; }
.doc-editor {
  margin-top: 8px; padding: 20px;
  border: 1px solid var(--line-strong); border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .82); box-shadow: var(--shadow-sm);
}
.doc-editor-hint { margin-bottom: 14px; color: var(--muted); font-size: 12.5px; }
.editor-textarea {
  width: 100%; min-height: 440px; padding: 16px 18px; resize: vertical;
  border: 1px solid var(--line); border-radius: 12px;
  color: var(--ink); background: #fcfbfe;
  font: 13px/1.75 var(--mono);
  transition: border-color .2s, box-shadow .2s, background-color .2s;
}
.editor-textarea:focus { outline: 0; border-color: rgba(102, 8, 116, .5); background: #fff; box-shadow: 0 0 0 3px rgba(102, 8, 116, .09); }
.doc-editor-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: 14px; }

/* --------------------------------------------------------------------------
   正文内区块卡片（申请编辑权限等）
   -------------------------------------------------------------------------- */
.panel {
  margin-top: 60px; padding: 28px 30px 30px;
  border: 1px solid var(--line-strong); border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .86); box-shadow: var(--shadow-sm);
}
.panel > h2 { font-size: 1.42rem; font-weight: 700; letter-spacing: -.03em; }
.panel-desc { margin-top: 10px; max-width: none; color: var(--muted); font-size: 14px; line-height: 1.85; }
.panel-form { margin-top: 22px; }
.panel-tag {
  display: inline-flex; align-items: center; margin-left: 10px; padding: 3px 9px;
  border: 1px solid rgba(20, 185, 130, .3); border-radius: 999px;
  color: #0b6b4c; background: var(--mint-soft);
  font: 700 9.5px var(--mono); letter-spacing: .1em; text-transform: uppercase;
  vertical-align: middle;
}

/* --------------------------------------------------------------------------
   页脚
   -------------------------------------------------------------------------- */
.doc-footer { margin-top: 64px; padding-top: 28px; border-top: 1px solid var(--line-strong); }
.doc-footer p { margin: 0 0 16px; color: var(--muted); font-size: 13px; line-height: 1.85; }
.doc-footer-links { display: flex; flex-wrap: wrap; gap: 10px 26px; }
.doc-footer-links a {
  color: var(--primary-dark); font: 700 12px var(--mono); letter-spacing: .04em; transition: color .2s;
}
.doc-footer-links a:hover { color: var(--primary); }
.site-footer { padding: 40px 0 44px; border-top: 1px solid var(--line); background: #fff; }
.site-footer .footer-shell {
  width: var(--page-max); margin-inline: auto;
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 28px;
}
.site-footer a { color: #6a5f73; font-size: 13px; font-weight: 600; transition: color .2s; }
.site-footer a:hover { color: var(--primary); }
.site-footer .copyright { margin-left: auto; color: #94899e; font: 600 10.5px var(--mono); letter-spacing: .06em; }
.site-footer .copyright a { color: inherit; font: inherit; letter-spacing: inherit; }
.site-footer .copyright a:hover { color: var(--muted); }
/* 页脚「更多页面」：动态列出已发布的自定义页面，无内容时保持 hidden 不占位 */
.site-footer .footer-more {
  display: inline-flex; flex-wrap: wrap; align-items: center; gap: 6px 16px;
}
.site-footer .footer-more-label { color: #94899e; font: 600 10.5px var(--mono); letter-spacing: .08em; }

/* --------------------------------------------------------------------------
   登录门禁 + 登录/注册弹窗
   -------------------------------------------------------------------------- */
.auth-gate {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 24px; overflow-y: auto;
  background:
    radial-gradient(circle at 84% 12%, rgba(102, 8, 116, .14), transparent 34%),
    linear-gradient(180deg, #fbf7fd 0%, var(--paper) 70%);
}
.auth-gate::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(148, 116, 158, .12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 116, 158, .12) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
}
.gate-card {
  position: relative; z-index: 1; width: min(460px, 100%);
  padding: 40px 36px 34px; text-align: center;
  border: 1px solid var(--line-strong); border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .92); box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
}
.gate-mark {
  width: 58px; height: 58px; margin: 0 auto 22px;
  display: grid; place-items: center; border-radius: 17px; color: #fff;
  background: linear-gradient(150deg, var(--primary), var(--primary-dark));
  box-shadow: 0 16px 38px rgba(74, 6, 94, .3);
}
.gate-mark svg { width: 27px; height: 27px; }
.gate-card .section-label { margin-bottom: 14px; }
.gate-title { font-size: clamp(1.6rem, 4vw, 2rem); font-weight: 700; line-height: 1.2; letter-spacing: -.04em; }
.gate-lede { margin: 12px auto 0; max-width: 34ch; color: var(--muted); font-size: 14px; line-height: 1.8; }
.gate-actions { display: flex; gap: 10px; justify-content: center; margin-top: 26px; }
.gate-actions .btn { flex: 1 1 140px; }
.gate-note { margin-top: 20px; color: #94899e; font: 600 10.5px var(--mono); letter-spacing: .06em; }

.modal {
  position: fixed; inset: 0; z-index: 300;
  display: flex; align-items: center; justify-content: center;
  padding: 24px; overflow-y: auto;
  background: rgba(26, 8, 32, .5); backdrop-filter: blur(6px);
}
.modal-card {
  position: relative; width: min(420px, 100%);
  padding: 30px 30px 28px;
  border: 1px solid rgba(255, 255, 255, .5); border-radius: var(--radius-md);
  background: #fff; box-shadow: var(--shadow-lg);
}
#loginModal .modal-card, #siteAuthModal .modal-card {
  width: min(620px, 100%); max-height: calc(100dvh - 48px); overflow-y: auto;
}
.modal-close {
  position: absolute; top: 14px; right: 14px;
  width: 32px; height: 32px; display: grid; place-items: center; cursor: pointer;
  border: 1px solid var(--line); border-radius: 50%;
  color: var(--muted); background: #fff; font-size: 19px; line-height: 1;
  transition: color .2s, border-color .2s, background-color .2s;
}
.modal-close:hover { color: var(--ink); border-color: var(--line-strong); background: var(--paper); }
.auth-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.auth-tab {
  flex: 1; padding: 10px 0; cursor: pointer;
  border: 1px solid var(--line-strong); border-radius: 9px;
  color: var(--muted); background: #faf7fc;
  font-size: 14px; font-weight: 700;
  transition: color .2s, border-color .2s, background-color .2s;
}
.auth-tab:hover { color: var(--ink); background: #fff; }
.auth-tab.active { color: #fff; border-color: var(--ink); background: var(--ink); }
.auth-tab.active:hover { color: #fff; background: #3a0e44; }
.auth-pane > p { margin-bottom: 16px; color: var(--muted); font-size: 13px; line-height: 1.75; }
.auth-pane .field + .field { margin-top: 12px; }
.auth-pane .btn { margin-top: 18px; }
.auth-pane .field-row .btn-send-code { margin-top: 0; }
.registration-methods { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 18px 0; }
.registration-method {
  min-height: 64px; padding: 10px 12px; cursor: pointer; text-align: left;
  border: 1px solid var(--line); border-radius: 9px; color: var(--muted); background: #faf7fc;
  transition: color .2s, border-color .2s, background-color .2s, box-shadow .2s;
}
.registration-method b { display: block; color: var(--ink); font-size: 13px; line-height: 1.25; }
.registration-method small { display: block; margin-top: 4px; font-size: 11px; line-height: 1.35; }
.registration-method:hover { border-color: var(--line-strong); background: #fff; }
.registration-method.active { border-color: rgba(102, 8, 116, .5); background: var(--primary-soft); box-shadow: inset 3px 0 0 var(--primary); }
.registration-method.active b { color: var(--primary-dark); }
.register-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 12px; align-items: start; }
.register-grid .field + .field { margin-top: 0; }
#studentIdFields, [data-auth-student-fields] { margin-top: 12px; }
button[data-auth-open]:not(.btn) {
  padding: 0; border: 0; color: var(--primary); background: transparent; cursor: pointer;
  font: inherit; text-decoration: underline;
}
button[data-auth-open]:not(.btn):hover { color: var(--primary-dark); }
.auth-switch { margin-top: 14px; color: var(--muted); font-size: 12.5px; text-align: center; }
.auth-switch button {
  padding: 0; border: 0; background: none; cursor: pointer;
  color: var(--primary-dark); font-size: 12.5px; font-weight: 700;
  border-bottom: 1px solid rgba(74, 6, 94, .3);
}
.auth-switch button:hover { color: var(--primary); border-bottom-color: var(--primary); }

/* --------------------------------------------------------------------------
   响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1120px) {
  .doc-shell { grid-template-columns: 208px minmax(0, 1fr); gap: 34px; }
}
@media (max-width: 900px) {
  :root { --nav-h: 68px; }
  .menu-toggle { display: block; position: relative; z-index: 2; }
  .nav-open .menu-toggle span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .nav-open .menu-toggle span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .nav-links {
    position: fixed; inset: 0; z-index: 1;
    padding: 104px 28px 40px;
    flex-direction: column; align-items: flex-start; gap: 20px;
    background: var(--paper);
    opacity: 0; visibility: hidden; transform: translateY(-12px);
    transition: opacity .2s, transform .2s, visibility .2s;
  }
  .nav-open .nav-links { opacity: 1; visibility: visible; transform: none; }
  .nav-links > a:not(.nav-cta) { font-size: 20px; }
  .nav-user { flex-wrap: wrap; gap: 12px; }
  .nav-search-btn { width: 100%; justify-content: space-between; }
  .doc-main { padding: calc(104px + var(--ad-offset)) 0 70px; }
  .doc-shell { grid-template-columns: 1fr; gap: 30px; }
  .doc-toc { position: static; top: auto; max-height: none; }
  .doc-header { margin-bottom: 30px; padding-bottom: 22px; }
  .form-grid { grid-template-columns: 1fr; }
  .panel { padding: 24px 20px 26px; }
}
@media (max-width: 620px) {
  .brand-name b { font-size: 14.5px; }
  .doc-main { padding: calc(92px + var(--ad-offset)) 0 56px; }
  .doc-search { top: calc(78px + var(--ad-offset)); width: calc(100vw - 20px); border-radius: 12px; }
  .doc-search-bar { flex-direction: column; align-items: stretch; }
  .doc-search-actions { justify-content: flex-end; }
  .doc-search-actions .doc-search-ai { margin-right: auto; }
  .doc-markdown h2 { margin-top: 44px; }
  .doc-markdown table { font-size: 12.5px; }
  .doc-markdown thead th, .doc-markdown tbody td { padding: 9px 12px; }
  .gate-card { padding: 32px 22px 28px; }
  .gate-actions { flex-direction: column; }
  .modal-card { padding: 26px 20px 24px; }
  #loginModal .modal-card, #siteAuthModal .modal-card { max-height: calc(100dvh - 28px); }
  .register-grid { grid-template-columns: 1fr; gap: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .doc-toc-skeleton span { animation: none; }
}

/* --------------------------------------------------------------------------
   游客预览提示条：固定于页面底部，登录后隐藏
   -------------------------------------------------------------------------- */
.guest-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 95;
  display: flex; align-items: center;
  background: linear-gradient(90deg, var(--primary-deep), #3a1045 58%, #441352);
  border-top: 1px solid rgba(255, 255, 255, .07);
  color: #f3e9f7;
  padding: 10px 0;
}
.guest-lock { flex: none; display: inline-flex; }
.guest-lock svg { width: 15px; height: 15px; color: #dcaef0; }
.guest-bar .ad-cta {
  flex: none; padding: 7px 16px; border-radius: 8px;
  background: rgba(220, 174, 240, .16); border: none; cursor: pointer;
  color: #ecd3f5; font: 600 12.5px var(--sans);
  transition: background-color .2s;
}
.guest-bar .ad-cta:hover { background: rgba(220, 174, 240, .3); color: #fff; }
body:has(.guest-bar:not([hidden])) .site-footer { padding-bottom: 74px; }

/* 游客文末锁定区块 */
.doc-lock {
  margin-top: 48px; padding: 34px 30px;
  border: 1px dashed rgba(150, 120, 165, .45); border-radius: 16px;
  text-align: center;
  background: rgba(150, 120, 165, .06);
}
.doc-lock-title { font: 700 17px var(--sans); letter-spacing: -.01em; color: var(--ink); margin-bottom: 8px; }
.doc-lock-desc { font-size: 13.5px; color: var(--muted-2); margin-bottom: 18px; }

/* --------------------------------------------------------------------------
   AI 入门指南：指南区块组件（guide.html 复用，旧版独立页兼容保留）
   -------------------------------------------------------------------------- */
.guide-wrap { width: min(940px, calc(100vw - 40px)); margin: 0 auto; }
.guide-sec { margin: 44px 0; scroll-margin-top: 108px; }
.guide-sec .sec-head { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.guide-sec .sec-num {
  width: 42px; height: 42px; flex: none;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--primary-line); border-radius: 12px;
  color: var(--primary-dark); background: var(--primary-mist);
  font: 700 13px var(--mono); letter-spacing: .02em;
}
.guide-sec .sec-head h2 { font-size: clamp(1.5rem, 2.6vw, 1.95rem); font-weight: 700; line-height: 1.3; letter-spacing: -.035em; }
.guide-sec .sec-desc { max-width: none; margin-bottom: 24px; color: var(--muted); font-size: 15px; line-height: 1.85; }
.guide-sec p.lead { max-width: none; margin-bottom: 16px; color: var(--ink-2); font-size: 15.5px; line-height: 1.85; }
.gcard {
  margin: 14px 0; padding: 24px 26px;
  border: 1px solid var(--line); border-radius: 14px;
  background: #fff; box-shadow: 0 8px 24px rgba(58, 16, 72, .05);
  transition: border-color .2s, box-shadow .2s;
}
.gcard:hover { border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.gcard h3 { display: flex; align-items: center; gap: 9px; margin-bottom: 10px; font-size: 16.5px; font-weight: 700; letter-spacing: -.02em; }
.gcard h3 .dot { width: 8px; height: 8px; flex: none; border-radius: 2px; background: var(--primary); box-shadow: 0 0 0 3px var(--primary-mist); }
.gcard p { margin-bottom: 9px; color: var(--ink-2); font-size: 14.5px; line-height: 1.85; }
.gcard p:last-child { margin-bottom: 0; }
.gcard pre {
  margin: 12px 0; padding: 17px 20px; overflow-x: auto;
  border: 1px solid #46204f; border-radius: 12px;
  color: #efdcf6; background: var(--primary-deep);
  font: 12.5px/1.85 var(--mono);
}
.gcard code { padding: 2px 7px; border: 1px solid var(--line); border-radius: 5px; background: #f8f3fb; color: #5d0a6b; font-family: var(--mono); font-size: .86em; }
.gcard pre code { padding: 0; border: 0; background: none; color: inherit; font-size: inherit; }
.tip, .warn, .note, .win {
  position: relative; margin: 14px 0; padding: 14px 18px 14px 50px;
  border-radius: 0 10px 10px 0; font-size: 14px; line-height: 1.8;
}
.tip::before, .warn::before, .note::before, .win::before { position: absolute; left: 18px; top: 14px; font: 800 13px var(--mono); }
.tip { border-left: 3px solid var(--mint); background: rgba(20, 185, 130, .08); color: #0b6b4c; }
.tip::before { content: "✓"; color: var(--mint); }
.warn { border-left: 3px solid #b7791f; background: rgba(183, 121, 31, .08); color: #78350f; }
.warn::before { content: "!"; color: #b7791f; }
.note { border-left: 3px solid var(--primary); background: rgba(102, 8, 116, .05); color: var(--primary-dark); }
.note::before { content: "i"; font-style: italic; color: var(--primary); }
.win { border-left: 3px solid #8b3aa0; background: rgba(139, 58, 160, .07); color: #5e216d; }
.win::before { content: "★"; color: #8b3aa0; }
.gcard table, .guide-sec table {
  width: 100%; margin: 14px 0; overflow: hidden;
  border: 1px solid var(--line-strong); border-radius: 12px;
  border-collapse: separate; border-spacing: 0;
  background: #fff; font-size: 13.5px;
}
.gcard th, .guide-sec th, .gcard td, .guide-sec td { padding: 11px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.gcard th, .guide-sec th { border-bottom: 1px solid var(--line-strong); background: #faf5fc; color: var(--primary-dark); font: 700 11px var(--mono); letter-spacing: .06em; white-space: nowrap; }
.gcard tr:last-child td, .guide-sec tr:last-child td { border-bottom: 0; }
.gcard td:first-child, .guide-sec td:first-child { color: var(--ink); font-weight: 600; }
.steps { counter-reset: step; margin: 14px 0; }
.steps .step { position: relative; padding: 0 0 22px 46px; }
.steps .step::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0; width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; color: #fff; background: var(--primary);
  box-shadow: 0 8px 18px rgba(102, 8, 116, .26);
  font: 700 12px var(--mono);
}
.steps .step::after { content: ""; position: absolute; left: 14px; top: 36px; bottom: 4px; width: 2px; background: var(--line); }
.steps .step:last-child { padding-bottom: 0; }
.steps .step:last-child::after { display: none; }
.steps h4 { margin-bottom: 5px; font-size: 15px; font-weight: 700; letter-spacing: -.01em; }
.steps p { color: var(--muted); font-size: 14px; line-height: 1.8; }
.pill { display: inline-block; margin-right: 6px; padding: 3px 9px; border: 1px solid transparent; border-radius: 999px; font: 700 10px var(--mono); letter-spacing: .08em; text-transform: uppercase; }

/* --------------------------------------------------------------------------
   批注/评阅：选中文字 → 浮动按钮（fixed，视口坐标定位）→ 鼠标旁悬浮卡
   -------------------------------------------------------------------------- */
.anno-fab {
  position: fixed; z-index: 120; /* 高于 sticky 导航(100)/赞助条(95)，选区贴近视口顶部时仍可点 */
  transform: translate(-50%, -130%);
  display: none;
}
.anno-fab.is-visible { display: block; }
.anno-fab button {
  padding: 6px 14px; cursor: pointer;
  border: 1px solid var(--primary-dark); border-radius: 999px;
  background: var(--primary); color: #fff;
  font: 700 12px var(--sans); letter-spacing: .02em;
  box-shadow: 0 6px 18px rgba(102, 8, 116, .32);
  transition: background-color .15s, transform .15s;
}
.anno-fab button:hover { background: var(--primary-dark); transform: translateY(-1px); }

/* 批注条目元信息/操作行（悬浮卡内复用） */
.anno-item-meta {
  display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap;
  margin-bottom: 8px;
  font-size: 11.5px; color: var(--muted-2);
}
.anno-item-meta b { color: var(--ink); font-size: 12.5px; font-weight: 700; }
.anno-item-meta .anno-time { font: 600 10.5px var(--mono); }
.anno-item-actions {
  margin-top: 8px; display: flex; gap: 10px; flex-wrap: wrap;
  font-size: 11.5px;
}
.anno-item-actions button {
  padding: 0; cursor: pointer; border: 0; background: transparent;
  color: var(--primary-dark); font: 600 11.5px var(--sans);
  border-bottom: 1px solid rgba(74, 6, 94, .3);
}
.anno-item-actions button:hover { color: var(--primary); border-bottom-color: var(--primary); }
.anno-item-actions button.danger { color: var(--red); border-bottom-color: rgba(185, 28, 28, .3); }
.status-pill.resolved { background: rgba(20, 185, 130, .12); color: #0b6b4c; }
.status-pill.rejected { background: rgba(185, 28, 28, .1); color: #b91c1c; }

/* 批注锚文本引用条（悬浮卡内复用） */
.anno-anchor {
  margin: 0 0 8px; padding: 6px 10px;
  border-left: 2px solid var(--primary); border-radius: 0 6px 6px 0;
  background: var(--primary-mist); color: var(--primary-dark);
  font-size: 12px; line-height: 1.55;
  max-height: 80px; overflow: hidden;
}
.anno-actions { margin-top: 10px; display: flex; gap: 8px; }

/* --------------------------------------------------------------------------
   Word 式批注：正文高亮（.anno-mark）+ 悬浮批注卡（.anno-pop）
   -------------------------------------------------------------------------- */
/* 正文中的批注标记：浅紫底 + 下划线；悬停加深；打开态更深 */
.anno-mark {
  background: rgba(102, 8, 116, .09);
  border-bottom: 2px solid rgba(102, 8, 116, .38);
  border-radius: 2px; padding: 0 1px;
  cursor: pointer;
  transition: background-color .15s, border-color .15s, color .15s;
}
.anno-mark:hover {
  background: rgba(102, 8, 116, .2);
  border-bottom-color: var(--primary);
  color: var(--primary-dark);
}
.anno-mark.is-open {
  background: rgba(102, 8, 116, .26);
  border-bottom-color: var(--primary-dark);
  color: var(--primary-dark);
}

/* 悬浮批注卡：绝对定位跟随锚点；移动端退化为底部抽屉 */
.anno-pop {
  position: absolute; z-index: 120; /* 高于 sticky 导航(100)/赞助条(95)，顶部锚点的卡片不被遮挡 */
  width: 340px; max-width: calc(100vw - 24px); max-height: 430px;
  display: flex; flex-direction: column;
  border: 1px solid var(--line-strong); border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .97); box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
}
.anno-pop-head {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; border-bottom: 1px solid var(--line);
}
.anno-pop-head b { flex: none; font-size: 12.5px; color: var(--ink); }
.anno-pop-anchor {
  flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: var(--muted-2); font-size: 11.5px;
}
.anno-pop-close {
  flex: none; width: 24px; height: 24px; border: 0; border-radius: 6px;
  background: none; color: var(--muted); font-size: 16px; cursor: pointer;
}
.anno-pop-close:hover { background: #f3edf6; color: var(--ink); }
.anno-pop-thread { flex: 1; overflow-y: auto; padding: 12px 14px; }
.anno-pop-item { padding: 8px 0; border-bottom: 1px dashed var(--line); }
.anno-pop-item:last-child { border-bottom: 0; }
.anno-pop-item.is-reply { margin-left: 14px; padding-left: 10px; border-left: 2px solid var(--primary-line); }
.anno-pop-item.is-resolved .anno-pop-content { text-decoration: line-through; opacity: .7; }
.anno-pop-content { margin-top: 4px; color: var(--ink-2); font-size: 13px; line-height: 1.7; word-break: break-word; }
.anno-pop-compose { padding: 10px 14px 12px; border-top: 1px solid var(--line); }
.anno-pop-compose textarea {
  width: 100%; padding: 8px 10px; resize: vertical;
  border: 1px solid var(--line); border-radius: 8px;
  background: #fff; color: var(--ink); font: 13px/1.6 var(--sans);
}
.anno-pop-compose textarea:focus { outline: 0; border-color: rgba(102, 8, 116, .5); box-shadow: 0 0 0 3px rgba(102, 8, 116, .09); }
.anno-pop-compose .anno-anchor { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }
.anno-pop-compose .anno-anchor button { border: 0; background: none; cursor: pointer; color: var(--muted); font-size: 13px; }
.anno-pop-edit textarea {
  width: 100%; margin-top: 4px; padding: 8px 10px; resize: vertical;
  border: 1px solid var(--line); border-radius: 8px;
  background: #fff; color: var(--ink); font: 13px/1.6 var(--sans);
}
.anno-pop-edit-actions { margin-top: 6px; display: flex; gap: 8px; }
.anno-pop .status-pill {
  display: inline-flex; padding: 1px 8px; margin-left: 6px; border-radius: 999px;
  font: 700 9.5px var(--mono); letter-spacing: .06em;
}
.anno-pop .status-pill.resolved { color: var(--green); background: var(--green-soft); }
.anno-pop .status-pill.rejected { color: var(--red); background: var(--red-soft); }

/* 添加批注卡变体：与阅读卡同构，textarea 区域更紧凑 */
.anno-pop-add .anno-pop-compose { border-top: 0; padding-top: 4px; }
.anno-pop-add textarea { min-height: 68px; }

@media (max-width: 768px) {
  /* 移动端：悬浮卡（阅读/添加）改为底部抽屉，不超出屏幕 */
  .anno-pop {
    position: fixed; left: 8px !important; right: 8px; bottom: 8px; top: auto !important;
    width: auto !important; max-width: none; max-height: 62vh; z-index: 120;
  }
}

.pill.free { border-color: rgba(20, 185, 130, .3); background: var(--mint-soft); color: #0b6b4c; }
.pill.paid, .pill.pin { border-color: var(--red-line); background: var(--red-soft); color: var(--red); }
.pill.win, .pill.pil-win { border-color: var(--primary-line); background: var(--primary-mist); color: var(--primary-dark); }
.pill.mac { border-color: #ddd6fe; background: #ede9fe; color: #6d28d9; }
.pill.linux { border-color: #fde68a; background: #fef3c7; color: #92400e; }
.hlist { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; margin: 12px 0; }
.hlist .item { padding: 13px 15px; border: 1px solid var(--line); border-radius: 10px; background: #faf7fc; color: var(--muted); font-size: 13.5px; line-height: 1.7; }
.hlist .item strong { display: block; margin-bottom: 3px; color: var(--ink); font-size: 14px; }
@media (max-width: 640px) {
  .guide-sec { margin: 32px 0; }
}

/* --------------------------------------------------------------------------
   AI 动态资讯流
   -------------------------------------------------------------------------- */
.post { margin: 0 0 34px; padding: 26px 28px; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: 0 8px 24px rgba(58, 16, 72, .05); }
.post-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.post-day { flex: none; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--primary-line); background: var(--primary-mist); color: var(--primary-dark); font: 700 11px var(--mono); letter-spacing: .08em; }
.post-title { font-size: 19px; font-weight: 700; letter-spacing: -.025em; line-height: 1.3; }
.feed-label { display: flex; align-items: center; gap: 10px; margin: 52px 0 18px; }
.feed-label::after { content: ""; flex: 1; height: 1px; background: var(--line-strong); }
.feed-label span { color: var(--primary-dark); font: 700 10px var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.post .doc-markdown, .post-body { font-size: 14.5px; }
.feed-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 22px 0 20px; padding: 0; border: 0; }
.feed-tools-label { color: var(--muted-2); font: 700 10px var(--mono); letter-spacing: .12em; text-transform: uppercase; white-space: nowrap; }
.feed-tags { display: flex; flex: 1 1 auto; flex-wrap: wrap; gap: 8px; }
.feed-tools > #btnSavedFilter { margin-left: auto; padding: 7px 15px; border: 1px solid var(--line-strong); border-radius: 999px; color: var(--ink-2); background: var(--white); cursor: pointer; font: 13px var(--sans); }
.feed-tools > #btnSavedFilter.current { border-color: var(--primary); color: #fff; background: var(--primary); font-weight: 600; }
.feed-tag, .post-tag, .post-save { border: 1px solid var(--line-strong); background: #fff; color: var(--muted); cursor: pointer; font: 600 11px var(--sans); }
.feed-tag { padding: 7px 15px; border-radius: 999px; color: var(--ink-2); font-size: 13px; }
.feed-tag.current { color: #fff; border-color: var(--primary); background: var(--primary); }
.feed-tag small { margin-left: 5px; color: var(--muted-2); font: 700 9px var(--mono); }
.feed-tag.current small { color: rgba(255, 255, 255, .78); }
.post-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: -4px 0 14px; }
.post-tag { padding: 3px 7px; border-radius: 4px; color: var(--primary-dark); background: var(--primary-soft); }
.post-brief { display: flex; flex-wrap: wrap; align-items: center; gap: 7px 12px; margin: -2px 0 15px; color: var(--muted); font-size: 12px; }
.post-brief b { margin-right: 4px; color: var(--muted-2); font: 700 9px var(--mono); letter-spacing: .08em; }
.post-brief a:not(.post-action) { color: var(--ink-2); text-decoration: underline; text-underline-offset: 2px; }
.post-action { margin-left: auto; color: var(--primary-dark); font-weight: 700; }
.post-save { float: right; margin: -3px 0 10px 12px; padding: 4px 8px; border-radius: 5px; color: var(--primary-dark); }

/* Homepage signal desk: the latest editorial item leads, then topic controls continue the reading flow. */
.signal-deck {
  position: relative; display: grid; grid-template-columns: minmax(0, 1fr) clamp(220px, 16vw, 300px); gap: clamp(20px, 2vw, 30px);
  margin: 28px 0 20px; padding: clamp(20px, 2.5vw, 30px); overflow: hidden;
  border: 1px solid #3d1450; border-radius: 12px; color: #fbf7fc;
  background: linear-gradient(125deg, #260a32 0%, #4a075d 62%, #71118a 100%);
  box-shadow: 0 16px 35px rgba(55, 8, 68, .18);
}
.signal-deck::before { content: ""; position: absolute; width: 250px; height: 250px; right: 94px; top: -175px; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; box-shadow: 0 0 0 34px rgba(255,255,255,.045), 0 0 0 68px rgba(255,255,255,.028); pointer-events: none; }
.signal-deck-copy, .signal-deck-meta { position: relative; z-index: 1; }
.signal-deck-eyebrow, .trend-kicker { display: flex; align-items: center; gap: 7px; font: 700 10px var(--mono); letter-spacing: .13em; }
.signal-deck-eyebrow { color: #e6c9ed; }
.signal-deck-eyebrow small { margin-left: 3px; color: rgba(255,255,255,.58); font: 600 10px var(--mono); letter-spacing: .04em; }
.signal-live-dot { width: 7px; height: 7px; border-radius: 50%; background: #d9ff72; box-shadow: 0 0 0 4px rgba(217,255,114,.14); }
.signal-deck h2 { max-width: 690px; margin: 11px 0 9px; color: #fff; font-size: clamp(1.35rem, 2.1vw, 1.82rem); line-height: 1.25; letter-spacing: -.04em; }
.signal-deck p { max-inline-size: min(100%, 96ch); margin: 0; color: rgba(255,255,255,.78); font-size: clamp(13px, 1.25vw, 15.5px); line-height: 1.78; overflow-wrap: anywhere; text-wrap: pretty; }
.signal-deck-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 17px; margin-top: 18px; }
.signal-deck-actions a { color: #351042; background: #f7eff9; padding: 8px 11px; font-size: 12px; font-weight: 800; text-decoration: none; }
.signal-deck-actions a:hover { background: #fff; }
.signal-deck-actions span { color: rgba(255,255,255,.68); font: 600 11px var(--mono); }
.signal-summary-refresh { padding: 0; border: 0; color: #e6c9ed; background: transparent; cursor: pointer; font: 700 11px var(--sans); }
.signal-summary-refresh:hover { color: #fff; text-decoration: underline; text-underline-offset: 3px; }
.signal-deck-meta { align-self: stretch; display: flex; flex-direction: column; justify-content: center; padding: 13px 0 13px 22px; border-left: 1px solid rgba(255,255,255,.25); }
.signal-deck-meta > span { color: rgba(255,255,255,.55); font: 700 9px var(--mono); letter-spacing: .13em; text-transform: uppercase; }
.signal-deck-meta strong { margin: 6px 0 12px; color: #fff; font: 700 14px var(--mono); }
.signal-deck-tags { display: flex; flex-wrap: wrap; gap: 5px; }
.signal-deck-tags span { padding: 3px 6px; border: 1px solid rgba(255,255,255,.22); color: #f6eaf9; font: 600 10px var(--sans); }
.trend-radar { margin: 22px 0 24px; padding: 16px 0 17px; border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line); }
.trend-radar-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; margin-bottom: 12px; }
.trend-radar-head h2 { margin: 4px 0 0; color: var(--ink); font-size: 16px; letter-spacing: -.025em; }
.trend-kicker { color: var(--primary-dark); }
.trend-radar-tags { gap: 7px; }
.trend-radar #btnSavedFilter { flex: none; margin: 0; padding: 7px 11px; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--primary-dark); background: var(--primary-soft); cursor: pointer; font: 700 11px var(--sans); }
.trend-radar #btnSavedFilter.current { border-color: var(--primary); color: #fff; background: var(--primary); }
.post-reading-time { display: inline-flex; align-items: center; min-height: 25px; color: var(--muted-2); font: 600 10px var(--mono); white-space: nowrap; }
.post-save { display: inline-flex; align-items: center; gap: 4px; float: right; margin: -3px 0 10px 12px; padding: 5px 8px; border-color: var(--primary-line); color: var(--primary-dark); background: var(--primary-soft); font-size: 10.5px; }
.post-save::before { content: "⌑"; font: 700 13px/1 var(--mono); }

@media (max-width: 780px) {
  .signal-deck { grid-template-columns: minmax(0, 1fr) 165px; }
  .signal-deck-meta { padding-left: 16px; }
}

@media (max-width: 620px) {
  .signal-deck { grid-template-columns: 1fr; gap: 18px; padding: 22px 20px; }
  .signal-deck::before { right: -88px; top: -152px; }
  .signal-deck-meta { display: block; padding: 13px 0 0; border-top: 1px solid rgba(255,255,255,.25); border-left: 0; }
  .signal-deck-meta strong { display: inline-block; margin: 0 13px 0 0; }
  .signal-deck-tags { display: inline-flex; vertical-align: middle; }
  .trend-radar-head { align-items: center; }
}

/* 新闻视频默认收起：资讯流先读标题与正文，视频只在悬停预览或主动展开时出现。 */
.post-video-reveal { margin: 15px 0 4px; border: 1px solid var(--line-strong); border-radius: 11px; background: #fcfafe; overflow: hidden; }
.post-video-toggle {
  width: 100%; min-height: 43px; padding: 10px 13px; display: flex; align-items: center; gap: 9px;
  border: 0; background: transparent; color: var(--ink); cursor: pointer; text-align: left;
  font: 700 12px var(--mono); letter-spacing: .03em;
}
.post-video-toggle:hover { background: var(--primary-mist); color: var(--primary-dark); }
.post-video-toggle:focus-visible { outline: 2px solid var(--primary); outline-offset: -2px; }
.post-video-toggle-main { display: inline-flex; align-items: center; gap: 7px; }
.post-video-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 3px rgba(102, 8, 116, .12); }
.post-video-toggle-meta { margin-left: auto; color: var(--muted-2); font: 600 10.5px var(--mono); letter-spacing: 0; }
.post-video-toggle-icon { width: 18px; height: 18px; display: grid; place-items: center; color: var(--primary-dark); font: 700 18px/1 var(--sans); transition: transform .2s ease; }
.post-video-toggle-icon::before { content: '+'; }
.post-video-toggle-icon { font-size: 0; }
.post-video-stage { display: none; padding: 0 10px 10px; }
.post-video-reveal.is-hover-preview .post-video-stage,
.post-video-reveal.is-open .post-video-stage { display: block; animation: post-video-reveal .18s ease-out; }
.post-video-reveal.is-open .post-video-toggle-icon::before { content: '−'; }
.post-video-reveal .post-video { margin: 0; }
@keyframes post-video-reveal { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }

/* 每条新闻下的常规评论；与划词批注分开，讨论不要求先选中正文。 */
.post-comments { margin-top: 22px; padding-top: 14px; border-top: 1px solid var(--line); }
.post-comments-head { display: flex; align-items: center; }
.post-comments-toggle {
  display: inline-flex; align-items: center; gap: 7px; padding: 5px 0;
  border: 0; background: transparent; color: var(--muted); cursor: pointer; font: 700 11px var(--mono); letter-spacing: .08em;
}
.post-comments-toggle:hover { color: var(--primary-dark); }
.post-comments-count { min-width: 20px; padding: 1px 6px; border-radius: 999px; background: var(--primary-mist); color: var(--primary-dark); text-align: center; font-size: 10px; }
.post-comments-panel { padding-top: 12px; }
.post-comment-list { display: grid; gap: 12px; }
.post-comment-empty { margin: 2px 0 0; color: var(--muted-2); font-size: 13px; }
.post-comment-item { padding: 12px 13px; border: 1px solid var(--line); border-radius: 10px; background: #fcfbfd; }
.post-comment-item.is-reply { padding: 10px 12px; background: #faf7fc; }
.post-comment-meta { display: flex; align-items: baseline; gap: 9px; }
.post-comment-meta b { color: var(--ink); font-size: 12.5px; }
.post-comment-meta time { color: var(--muted-2); font: 600 10px var(--mono); }
.post-comment-item p { margin: 7px 0 0; color: var(--ink-2); font-size: 13.5px; line-height: 1.7; white-space: pre-wrap; }
.post-comment-replies { margin: 8px 0 0 19px; padding-left: 11px; border-left: 2px solid var(--primary-line); display: grid; gap: 8px; }
.post-comment-item-actions { display: flex; gap: 10px; margin-top: 8px; }
.post-comment-item-actions button, .post-comment-replying button {
  padding: 0; border: 0; background: none; color: var(--primary-dark); cursor: pointer; font-size: 11.5px; font-weight: 700;
}
.post-comment-item-actions button.danger { color: var(--red); }
.post-comment-compose { margin-top: 13px; }
.post-comment-input { width: 100%; min-height: 72px; padding: 10px 12px; border: 1px solid var(--line-strong); border-radius: 9px; background: #fff; color: var(--ink); font: 13px/1.6 var(--sans); resize: vertical; }
.post-comment-input:focus { outline: 2px solid rgba(102, 8, 116, .24); border-color: var(--primary); }
.post-comment-actions { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 8px; }
.post-comment-status { color: var(--muted); font-size: 12px; }
.post-comment-login { padding: 8px 0; border: 0; background: none; color: var(--primary-dark); cursor: pointer; font-size: 12.5px; font-weight: 700; }
.post-comment-replying { display: flex; align-items: center; justify-content: space-between; margin-bottom: 7px; color: var(--muted); font-size: 12px; }

/* --------------------------------------------------------------------------
   账户页导航：邮箱链接的当前页态
   -------------------------------------------------------------------------- */
.nav-user .user-email.current { color: var(--ink); }
.nav-user .user-email.current::after {
  content: ""; display: block; height: 2px; margin-top: 2px;
  border-radius: 2px; background: var(--primary);
}

/* --------------------------------------------------------------------------
   视频卡片（动态 / 指南演示视频）：封面图 + 居中播放按钮，点击后才加载播放
   参考 Data-Analysis-Agent-mainpage showcase 的质感
   -------------------------------------------------------------------------- */
.post-video {
  position: relative; margin: 16px 0 4px; overflow: hidden;
  border: 1px solid var(--line-strong); border-radius: 14px;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(circle at 78% 18%, rgba(102, 8, 116, .35), transparent 46%),
    linear-gradient(150deg, var(--primary-deep), #3a1045 60%, #441352);
  box-shadow: 0 14px 34px rgba(46, 16, 58, .16);
}
.post-video .video-cover {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; display: block;
}
.post-video .video-play {
  position: absolute; inset: 0; z-index: 2; cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 14px;
  border: 0; background: linear-gradient(180deg, rgba(26, 8, 32, .06), rgba(26, 8, 32, .34));
  transition: background-color .25s;
}
.post-video .video-play:hover { background: linear-gradient(180deg, rgba(26, 8, 32, .14), rgba(26, 8, 32, .46)); }
.post-video .play-disc {
  width: 64px; height: 64px; flex: none;
  display: grid; place-items: center; border-radius: 50%;
  color: var(--primary-dark); background: rgba(255, 255, 255, .94);
  box-shadow: 0 14px 36px rgba(26, 8, 32, .38), 0 0 0 8px rgba(255, 255, 255, .18);
  transition: transform .22s ease, box-shadow .22s ease;
}
.post-video .video-play:hover .play-disc { transform: scale(1.07); box-shadow: 0 18px 44px rgba(26, 8, 32, .44), 0 0 0 10px rgba(255, 255, 255, .22); }
.post-video .play-disc svg { width: 26px; height: 26px; margin-left: 3px; }
.post-video .play-copy { display: flex; flex-direction: column; gap: 3px; text-align: left; color: #fff; }
.post-video .play-copy strong { font-size: 15.5px; font-weight: 700; letter-spacing: -.01em; text-shadow: 0 2px 10px rgba(26, 8, 32, .5); }
.post-video .play-copy small { font: 600 11px var(--mono); letter-spacing: .08em; color: rgba(255, 255, 255, .82); text-transform: uppercase; }
.post-video.is-playing { aspect-ratio: auto; }
.post-video.is-playing video { display: block; width: 100%; max-height: 70vh; background: #000; }
@media (max-width: 620px) {
  .post-video .video-play { flex-direction: column; gap: 10px; }
  .post-video .play-copy { text-align: center; }
}

/* 正文（Markdown）内的视频块：与段落节奏一致的上下间距；图片块同款 */
.doc-markdown .post-video { margin: 22px 0; }
.doc-markdown p > img:only-child { display: block; margin: 22px auto; max-width: 100%; border-radius: 12px; border: 1px solid var(--line-strong); }
.doc-markdown p img { max-width: 100%; }

/* 指南页演示视频区块（位于介绍区下方、01 章之前，游客可见） */
.guide-video { margin: 34px 0 8px; }
.guide-video .post-video { margin: 14px 0 0; }
.guide-video-label {
  display: flex; align-items: center; gap: 10px;
  color: var(--primary-dark); font: 700 10px var(--mono); letter-spacing: .14em; text-transform: uppercase;
}
.guide-video-label::after { content: ""; flex: 1; height: 1px; background: var(--line-strong); }

/* --------------------------------------------------------------------------
   游客虚化门：AI 动态 —— 第一条完整，其后条目模糊 + 渐变遮罩
   -------------------------------------------------------------------------- */
.guest-lock-stack { position: relative; margin-top: 34px; }
/* 遮罩内的条目：隐约可见但不可读，且不可选中/交互 */
.guest-lock-stack .post {
  filter: blur(5px) saturate(.82);
  pointer-events: none; user-select: none;
}
/* 越靠下越模糊、越淡，过渡自然 */
.guest-lock-stack .post:nth-of-type(n + 3) { filter: blur(7px) saturate(.75); opacity: .82; }
.guest-lock-stack .post:nth-of-type(n + 5) { filter: blur(9px) saturate(.68); opacity: .62; }
.post-veil {
  position: absolute; inset: -8px 0 0; z-index: 3; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px; padding: 40px 24px; text-align: center;
  border: 0; border-radius: 18px;
  background: linear-gradient(180deg,
    rgba(248, 245, 250, .1) 0%,
    rgba(248, 245, 250, .55) 34%,
    rgba(248, 245, 250, .9) 62%,
    var(--paper) 100%);
}
.post-veil .veil-lock {
  width: 54px; height: 54px; display: grid; place-items: center;
  border-radius: 16px; color: #fff;
  background: linear-gradient(150deg, var(--primary), var(--primary-dark));
  box-shadow: 0 16px 38px rgba(74, 6, 94, .3);
}
.post-veil .veil-lock svg { width: 24px; height: 24px; }
.post-veil .veil-title { font-size: 17px; font-weight: 700; letter-spacing: -.01em; color: var(--ink); }
.post-veil .veil-desc { max-width: 40ch; color: var(--muted-2); font-size: 13.5px; line-height: 1.75; }
.post-veil .btn { margin-top: 8px; }

/* --------------------------------------------------------------------------
   游客门：AI 入门指南 —— 服务端截断到 02 章之前，前端在正文后渲染静态遮罩卡
   -------------------------------------------------------------------------- */
/* 服务端截断后的静态遮罩（指南游客态，覆盖在正文流中） */
.guide-veil-static {
  display: flex; flex-direction: column; align-items: center;
  padding: 56px 0 24px; text-align: center;
}
.guide-veil-static .veil-card {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  max-width: 420px; padding: 30px 32px 28px;
  border: 1px solid var(--line-strong); border-radius: var(--radius-md);
  background: rgba(255, 255, 255, .94); box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
}
.guide-veil-static .veil-lock {
  width: 50px; height: 50px; display: grid; place-items: center;
  border-radius: 15px; color: #fff;
  background: linear-gradient(150deg, var(--primary), var(--primary-dark));
  box-shadow: 0 14px 32px rgba(74, 6, 94, .3);
}
.guide-veil-static .veil-lock svg { width: 22px; height: 22px; }
.guide-veil-static .veil-title { font-size: 16.5px; font-weight: 700; letter-spacing: -.01em; color: var(--ink); }
.guide-veil-static .veil-desc { color: var(--muted-2); font-size: 13px; line-height: 1.75; }
.guide-veil-static .btn { margin-top: 8px; }

/* --------------------------------------------------------------------------
   管理面板：文件上传组件（视频 / 封面图）
   -------------------------------------------------------------------------- */
.upload-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.upload-row input[type="file"] {
  flex: 1 1 220px; min-width: 0; padding: 9px 11px;
  border: 1px dashed var(--line-strong); border-radius: 9px;
  background: #faf7fc; color: var(--muted);
  font: 12.5px var(--sans); cursor: pointer;
}
.upload-row input[type="file"]:hover { border-color: #c8b7d3; background: #fff; }
/* 管理台 Markdown 编辑器工具栏（插入视频/图片） */
.md-toolbar { display: flex; align-items: center; gap: 8px; margin: 0 0 8px; }
.md-toolbar .upload-status { margin: 0; min-height: 0; }

/* 编辑器实时预览面板（预览态替代 textarea 显示） */
.md-preview { margin-top: 8px; padding: 12px 14px; border: 1px dashed var(--line-strong); border-radius: 10px; background: #fff; max-height: 420px; overflow: auto; }
.md-preview img { max-width: 100%; height: auto; border-radius: 8px; }

.upload-status { margin-top: 7px; min-height: 16px; color: var(--muted); font: 600 12px var(--mono); }
.upload-status.ok { color: var(--green); }
.upload-status.err { color: var(--red); }
.upload-current {
  margin-top: 10px; padding: 12px 14px;
  border: 1px solid var(--line); border-radius: 10px; background: #fff;
}
.upload-current video { display: block; width: 100%; max-height: 220px; border-radius: 8px; background: #000; }
.upload-current img { display: block; max-width: 240px; max-height: 150px; border-radius: 8px; border: 1px solid var(--line); }
.upload-current .upload-link {
  display: inline-block; margin-top: 8px;
  color: var(--primary-dark); font: 600 11.5px var(--mono); word-break: break-all;
}
.upload-current .upload-link:hover { color: var(--primary); }

/* --------------------------------------------------------------------------
   2026 信息架构：面向清华学生的 AI 研究与实践社区
   以紫墨色谱承接校园辨识度；内容、学习和协作是三个并列入口。
   -------------------------------------------------------------------------- */
body {
  background: var(--paper);
}
.site-nav { background: rgba(248, 245, 250, .84); border-bottom-color: rgba(212, 198, 220, .8); backdrop-filter: blur(18px); }
.site-nav.scrolled { background: rgba(248, 245, 250, .94); border-color: var(--line-strong); box-shadow: 0 8px 24px rgba(57, 23, 76, .04); }
.brand-mark { border-radius: 7px; background: var(--primary); box-shadow: none; }
.brand-name b { font-weight: 750; letter-spacing: -.035em; }
.nav-links { gap: 22px; }
.nav-links > a:not(.nav-cta) { color: var(--muted); font-size: 13.5px; }
.nav-links > a:not(.nav-cta).current { color: var(--ink); }
.nav-links > a:not(.nav-cta).current::after { height: 2px; background: var(--primary); }
.nav-cta { border-radius: 7px; background: var(--ink); box-shadow: none; }
.nav-cta:hover { background: var(--primary-deep); }
.nav-cta.ghost { background: transparent; }
.ad-bar { height: var(--ad-h); background: var(--primary-deep); color: #f8f0fb; }
.ad-tag { border-radius: 3px; background: rgba(240, 204, 248, .18); color: #efd8f4; }
.ad-cta { color: #e8c7f0; }
.ad-close { color: #efd8f4; }
.doc-main { padding: calc(96px + var(--ad-offset)) 0 72px; }
.doc-shell { grid-template-columns: 210px minmax(0, 1fr); gap: clamp(38px, 5vw, 72px); }
.doc-shell.doc-shell--feed { grid-template-columns: minmax(0, 760px); justify-content: center; }
.doc-toc { padding: 4px 0 4px 16px; border: 0; border-left: 1px solid var(--line-strong); border-radius: 0; background: transparent; box-shadow: none; backdrop-filter: none; }
.doc-toc-label { color: var(--muted-2); }
.doc-toc-nav a { padding: 6px 9px; color: var(--muted); }
.doc-toc-nav a:hover { background: var(--primary-soft); color: var(--ink); }
.doc-toc-nav a.current { background: var(--primary-soft); color: var(--primary-dark); }
.doc-header { position: relative; margin-bottom: 32px; padding: 22px 0 28px; border-top: 2px solid var(--ink); border-bottom-color: var(--line); }
.doc-header::before { content: "LIVE SIGNAL"; position: absolute; top: -10px; right: 0; padding: 2px 7px; color: var(--primary-dark); background: var(--paper); font: 700 9px var(--mono); letter-spacing: .13em; }
.section-label { margin-bottom: 13px; color: var(--primary-dark); letter-spacing: .14em; }
.doc-title { max-width: none; font-weight: 760; letter-spacing: -.055em; }
.doc-lede { max-width: none; color: var(--ink-2); }
.hot-summary {
  margin: 0 0 22px; padding: 19px 21px 17px;
  border: 1px solid var(--primary-line); border-left: 3px solid var(--primary);
  background: linear-gradient(115deg, #fff 0%, var(--primary-soft) 155%);
}
.hot-summary-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.hot-summary-head > span { color: var(--primary-dark); font: 700 10px var(--mono); letter-spacing: .12em; }
.hot-summary-refresh { padding: 4px 8px; border: 1px solid var(--line-strong); border-radius: 5px; color: var(--ink-2); background: #fff; cursor: pointer; font: 600 11px var(--sans); }
.hot-summary-refresh:hover:not(:disabled) { border-color: var(--primary); color: var(--primary-dark); }
.hot-summary-refresh:disabled { cursor: wait; opacity: .64; }
.hot-summary h2 { margin: 12px 0 6px; color: var(--ink); font-size: 18px; letter-spacing: -.025em; }
.hot-summary > p { margin: 0; color: var(--ink-2); font-size: 13.5px; line-height: 1.75; }
.hot-summary .hot-summary-empty, .hot-summary .hot-summary-loading { color: var(--muted); }
.hot-summary-topics { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 11px; }
.hot-summary-topics span { padding: 3px 7px; border: 1px solid var(--primary-line); border-radius: 999px; color: var(--primary-dark); background: rgba(255, 255, 255, .72); font: 600 10px var(--mono); }
.hot-summary small { display: block; margin-top: 11px; color: var(--muted-2); font: 11px var(--mono); }
.journey-rail { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 26px; border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line-strong); }
.journey-rail a { min-width: 0; display: grid; gap: 3px; padding: 13px 16px 14px; border-left: 1px solid var(--line); color: var(--ink); transition: background-color .18s, color .18s; }
.journey-rail a:first-child { border-left: 0; }
.journey-rail a:hover { background: var(--primary-soft); color: var(--primary-dark); }
.journey-rail span { color: var(--primary); font: 700 9px var(--mono); letter-spacing: .12em; }
.journey-rail b { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.journey-rail small { overflow: hidden; color: var(--muted); text-overflow: ellipsis; white-space: nowrap; font-size: 11.5px; }
.doc-search-hint { margin-top: 18px; }
.doc-search-hint-btn { color: var(--muted); }
.doc-search-hint kbd { border-color: var(--line-strong); border-bottom-color: #aebed1; background: #fff; color: var(--ink-2); box-shadow: none; }
.feed-label { margin: 38px 0 15px; }
.feed-label span { color: var(--muted-2); }
.post, .art-row, .sq-card { border-radius: 8px; box-shadow: none; }
.post { padding: 23px 24px; border-left: 3px solid var(--primary-line); }
.post:hover, .art-row:hover, .sq-card:hover { border-color: var(--primary-line); box-shadow: 0 10px 24px rgba(57, 23, 76, .07); }
.post-day, .sq-tag { border-radius: 4px; }
.panel, .sq-form, .auth-card { border-radius: 10px; box-shadow: none; }
.panel { border-top: 2px solid var(--primary); }
.doc-markdown blockquote { border-left-color: var(--primary); background: var(--primary-soft); }
.doc-markdown pre { border-color: #4a065e; background: #32113f; box-shadow: none; }

@media (min-width: 1024px) {
  #feedSec { column-count: 2; column-gap: 18px; }
  #feedSec > .post,
  #feedSec > .guest-lock-stack .post { break-inside: avoid; margin: 0 0 18px; }
  #feedSec > .doc-empty, #feedSec > .doc-loading { column-span: all; }
  #feedSec > .guest-lock-stack { margin: 0; }
}
.site-footer { margin-top: auto; border-top-color: var(--line-strong); background: rgba(255, 255, 255, .68); }
.site-footer .copyright { color: var(--muted-2); }
.guest-bar { background: var(--primary-deep); }
.guest-bar .ad-cta { background: rgba(234, 199, 240, .16); color: #f8eefb; }
.admin-page .ad-bar { display: none !important; }
.admin-page .admin-main { padding-top: 96px; }
.admin-page .admin-head { border-top: 2px solid var(--ink); padding-top: 20px; }
.admin-page .admin-nav a.current { border-left-color: var(--primary); background: var(--primary-soft); }
.admin-page .stat { border-radius: 8px; background: #fff; }

/* Agent 写接口：把密钥、危险操作和资源能力明确分层，避免一长段说明淹没关键动作。 */
.agent-intro {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 24px;
  margin-bottom: 18px;
}
.agent-intro h2 { margin: 0 0 7px; color: var(--ink); font-size: clamp(1.28rem, 2vw, 1.62rem); letter-spacing: -.035em; }
.agent-intro .section-label { margin-bottom: 8px; }
.agent-intro .sec-desc { max-width: none; }
.agent-trust-badge {
  flex: none; margin-top: 5px; padding: 5px 8px; border: 1px solid var(--primary-line);
  color: var(--primary-dark); background: var(--primary-soft); font: 700 10px var(--mono); letter-spacing: .08em;
}
.agent-key-card {
  padding: 20px; border: 1px solid var(--primary-line); border-left: 3px solid var(--primary);
  background: linear-gradient(135deg, #fff 0%, var(--primary-soft) 130%);
}
.agent-key-meta { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 12px; }
.agent-key-meta strong { color: var(--primary-dark); font: 700 11px var(--mono); }
.agent-key-row { display: flex; align-items: center; gap: 18px; margin-top: 11px; }
.agent-key-row > code {
  min-width: 0; flex: 1; padding: 11px 12px; border: 1px solid var(--line); background: #fff;
  color: var(--ink); font: 600 12px/1.55 var(--mono); overflow-wrap: anywhere;
}
.agent-key-actions { display: flex; flex: none; gap: 8px; }
.agent-key-note { margin-top: 9px; color: var(--muted); font-size: 12px; }
.agent-key-card .status-text { display: block; min-height: 18px; margin-top: 6px; }
.agent-api-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-top: 31px; }
.agent-api-head .section-label { margin-bottom: 5px; }
.agent-api-head h3 { margin: 0; color: var(--ink); font-size: 16px; }
.agent-auth-line { padding: 6px 8px; border: 1px solid var(--line); color: var(--primary-dark); background: #fff; font: 600 10.5px var(--mono); white-space: nowrap; }
.agent-api-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }
.agent-api-card { min-width: 0; padding: 15px; border: 1px solid var(--line); background: #fff; }
.agent-method { display: inline-block; margin-bottom: 14px; padding: 3px 5px; color: var(--primary-dark); background: var(--primary-soft); font: 700 10px var(--mono); letter-spacing: .08em; }
.agent-api-card h4 { margin: 0; color: var(--ink); font: 700 12px var(--mono); overflow-wrap: anywhere; }
.agent-api-card p { min-height: 40px; margin: 8px 0 11px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.agent-api-card pre { margin: 0; padding: 9px; overflow: auto; border: 1px solid var(--line); background: #fbf9fc; color: var(--ink-2); font: 11px/1.55 var(--mono); }

@media (max-width: 900px) {
  .doc-main { padding-top: calc(88px + var(--ad-offset)); }
  /* 主题层的双栏规则在此断点必须退化为单栏，避免中等屏幕内容被侧栏挤压。 */
  .doc-shell { grid-template-columns: 1fr; gap: 30px; }
  .doc-shell--feed { grid-template-columns: minmax(0, 760px); }
  .doc-toc { position: static; top: auto; max-height: none; }
  .journey-rail { grid-template-columns: 1fr; }
  .journey-rail a, .journey-rail a:first-child { border-left: 0; border-top: 1px solid var(--line); }
  .journey-rail a:first-child { border-top: 0; }
  .doc-header::before { display: none; }
  .agent-api-grid { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  :root { --nav-h: 62px; --ad-h: 78px; }
  .doc-main { padding-top: calc(80px + var(--ad-offset)); }
  .doc-header { padding-top: 18px; }
  .doc-header.unified-page-head,
  .art-head.unified-page-head { padding-top: 0; padding-left: 16px; }
  .doc-title { font-size: clamp(2rem, 10vw, 2.55rem); }
  .journey-rail { margin-top: 20px; }
  .agent-intro, .agent-key-row, .agent-api-head { align-items: stretch; flex-direction: column; }
  .agent-trust-badge { align-self: flex-start; }
  .agent-key-actions { width: 100%; }
  .agent-key-actions .btn { flex: 1; }
  .agent-auth-line { overflow: auto; white-space: normal; }
}

/* 小屏幕以内容密度优先：保留足够触控面积，同时避免卡片与导航占据过多留白。 */
@media (max-width: 900px) {
  .nav-links {
    inset: var(--nav-h) 0 0;
    padding: 18px max(20px, 10vw) 28px;
    gap: 0;
    border-top: 1px solid var(--line-strong);
    background: rgba(248, 245, 250, .98);
  }
  .nav-links > a:not(.nav-cta) {
    width: 100%; padding: 13px 0;
    border-bottom: 1px solid var(--line);
  }
  .nav-links > a:not(.nav-cta).current::after { display: none; }
  .nav-links > a:not(.nav-cta).current { color: var(--primary-dark); }
  .nav-user { width: 100%; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line-strong); }
}

@media (max-width: 620px) {
  :root { --page-max: calc(100vw - 28px); }
  .nav-shell { width: calc(100vw - 28px); }
  .nav-links { padding: 14px 18px 24px; }
  .nav-links > a:not(.nav-cta) { padding: 12px 0; font-size: 18px; }
  .nav-user { align-items: stretch; gap: 9px; }
  .nav-user .user-email { max-width: 100%; }
  .sq-shell { width: calc(100vw - 28px); }
  .post, .art-row, .sq-card { padding: 17px 18px; }
  .sq-list { gap: 12px; }
  .post-title, .art-row h2, .sq-title { font-size: 17px; }
  .post-excerpt, .art-excerpt, .sq-excerpt { font-size: 13.5px; line-height: 1.68; }
  .post-meta, .sq-meta { font-size: 11px; }
}

/* 移动端：backdrop-filter 会让 fixed 菜单以头部为包含块，展开时只剩 68px 背景——改实色头部 */
@media (min-width: 901px) and (max-width: 1200px) {
  .nav-shell { width: calc(100% - 28px); gap: 12px; }
  .nav-links { gap: 12px; }
  .nav-user .user-email { max-width: 100px; }
}
@media (max-width: 900px) {
  .site-nav, .site-nav.scrolled { background: var(--paper); backdrop-filter: none; box-shadow: none; }
}
/* Real moderation events, not simulated model thoughts. */
.ai-review-progress { display:block; padding:16px 18px; margin:16px 0; border-left:3px solid var(--primary); background:var(--primary-soft); color:var(--ink); font:14px/1.7 var(--sans); overflow-wrap:anywhere; }
.ai-review-progress strong { display:block; font-size:16px; margin-bottom:8px; }
.ai-review-progress ol { padding-left:22px; margin:8px 0; }
.ai-review-progress li { padding:3px 0; }
.ai-review-progress p { margin-top:8px; color:var(--muted); font-size:12px; }
.ai-review-progress[aria-busy=true] strong::after { content:' …'; }
.sq-moderation-note { padding:10px 12px; background:var(--primary-soft); color:var(--primary-dark); font-size:13px; line-height:1.7; overflow-wrap:anywhere; }