/* ==========================================================================
   资料展示站 · 样式表
   纯静态，无外部依赖；设计令牌集中在 :root，改配色只需改这里
   ========================================================================== */

:root {
  --c-primary: #1565C0;
  --c-primary-d: #0D3C7A;
  --c-primary-l: #E8F0FE;
  --c-accent: #00796B;
  --c-accent-l: #E0F2F0;
  --c-ink: #0F172A;
  --c-text: #1F2937;
  --c-muted: #64748B;
  --c-line: #DCE3EC;
  --c-line-l: #EDF1F6;
  --c-bg: #FFFFFF;
  --c-surface: #F7F9FC;
  --c-warn: #B45309;
  --c-warn-l: #FEF3E2;
  --c-danger: #B3261E;
  --c-danger-l: #FCEBEA;

  --fs-xs: 12px;
  --fs-sm: 13px;
  --fs-base: 15px;
  --fs-lg: 17px;
  --fs-xl: 22px;
  --fs-2xl: 28px;
  --fs-3xl: 34px;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 4px 14px rgba(15, 23, 42, .05);
  --shadow-lg: 0 8px 30px rgba(15, 23, 42, .12);
  --wrap: 1180px;
  --ff: "Microsoft YaHei", "PingFang SC", "Segoe UI", system-ui, sans-serif;
  --ff-mono: "Cascadia Mono", Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--ff);
  font-size: var(--fs-base);
  line-height: 1.75;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--c-line);
}
.topbar-in {
  max-width: var(--wrap); margin: 0 auto; padding: 0 24px;
  height: 62px; display: flex; align-items: center; gap: 26px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff; font-weight: 700; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
}
.brand-name { font-size: var(--fs-lg); font-weight: 700; color: var(--c-primary-d); letter-spacing: .3px; }
.brand-sub { font-size: var(--fs-xs); color: var(--c-muted); margin-left: 2px; }

.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  padding: 7px 13px; border-radius: var(--radius-sm);
  color: var(--c-muted); font-size: var(--fs-sm); font-weight: 600;
  white-space: nowrap;
}
.nav a:hover { background: var(--c-surface); color: var(--c-primary); text-decoration: none; }
.nav a.on { background: var(--c-primary-l); color: var(--c-primary-d); }

.search-mini { position: relative; width: 230px; flex-shrink: 0; }
.search-mini input {
  width: 100%; height: 36px; padding: 0 34px 0 13px;
  border: 1px solid var(--c-line); border-radius: 18px;
  font-size: var(--fs-sm); font-family: var(--ff); color: var(--c-text);
  background: var(--c-surface); outline: none;
}
.search-mini input:focus { border-color: var(--c-primary); background: #fff; }
.search-mini .ic {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  color: var(--c-muted); font-size: 14px; pointer-events: none;
}

/* ---------- 通用块 ---------- */
.hero {
  background: linear-gradient(160deg, #F2F7FD 0%, #FFFFFF 62%);
  border-bottom: 1px solid var(--c-line);
  padding: 52px 0 46px;
}
.hero h1 {
  font-size: var(--fs-3xl); font-weight: 700; color: var(--c-primary-d);
  letter-spacing: .5px; line-height: 1.28;
}
.hero .lead {
  margin-top: 14px; max-width: 760px;
  font-size: var(--fs-lg); color: var(--c-muted); line-height: 1.8;
}
.hero-stats { display: flex; flex-wrap: wrap; gap: 36px; margin-top: 30px; }
.hstat b { display: block; font-size: var(--fs-2xl); color: var(--c-primary); line-height: 1.2; }
.hstat span { font-size: var(--fs-sm); color: var(--c-muted); }

.sec { padding: 44px 0; }
.sec + .sec { border-top: 1px solid var(--c-line-l); }
.sec-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 22px; flex-wrap: wrap; }
.sec-head h2 { font-size: var(--fs-xl); font-weight: 700; color: var(--c-primary-d); }
.sec-head .hint { font-size: var(--fs-sm); color: var(--c-muted); }
.sec-head .more { margin-left: auto; font-size: var(--fs-sm); font-weight: 600; }

/* ---------- 分类卡 ---------- */
.cats { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.cat {
  display: block; padding: 22px 22px 20px; border: 1px solid var(--c-line);
  border-radius: var(--radius-lg); background: var(--c-bg); color: inherit;
  transition: .16s; position: relative; overflow: hidden;
}
.cat::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--c-primary);
}
.cat.c-tech::before { background: var(--c-accent); }
.cat.c-asset::before { background: var(--c-warn); }
.cat:hover { border-color: var(--c-primary); box-shadow: var(--shadow); text-decoration: none; transform: translateY(-2px); }
.cat h3 { font-size: var(--fs-lg); color: var(--c-primary-d); margin-bottom: 6px; }
.cat p { font-size: var(--fs-sm); color: var(--c-muted); line-height: 1.7; }
.cat .n { margin-top: 12px; font-size: var(--fs-xs); color: var(--c-primary); font-weight: 700; }

/* ---------- 资料列表 ---------- */
.list { display: flex; flex-direction: column; gap: 12px; }
.doc {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 17px 20px; border: 1px solid var(--c-line); border-radius: var(--radius);
  background: var(--c-bg); transition: .14s;
}
.doc:hover { border-color: var(--c-primary); box-shadow: var(--shadow); }
.doc-ic {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  font-size: var(--fs-xs); font-weight: 700; letter-spacing: .5px;
  background: var(--c-surface); color: var(--c-muted);
}
.t-pdf  { background: #FCEBEA; color: #B3261E; }
.t-docx { background: #E8F0FE; color: #1565C0; }
.t-video{ background: #ECE6FA; color: #5B3FA8; }
.t-image{ background: #E0F2F0; color: #00796B; }
.t-audio{ background: #FEF3E2; color: #B45309; }
.t-code { background: #EAF3DE; color: #3B6D11; }
.t-zip  { background: #F1EFE8; color: #5F5E5A; }

.doc-main { min-width: 0; flex: 1; }
.doc-main h4 { font-size: var(--fs-base); font-weight: 700; color: var(--c-ink); line-height: 1.55; }
.doc-main h4 a { color: inherit; }
.doc-main h4 a:hover { color: var(--c-primary); text-decoration: none; }
.doc-main .sum {
  font-size: var(--fs-sm); color: var(--c-muted); margin-top: 4px; line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.doc-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 9px; font-size: var(--fs-xs); color: var(--c-muted); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 9px; }
.tag {
  font-size: var(--fs-xs); padding: 2px 9px; border-radius: 11px;
  background: var(--c-surface); color: var(--c-muted); border: 1px solid var(--c-line);
}
.tag.on { background: var(--c-primary-l); color: var(--c-primary-d); border-color: #B5D4F4; }
.doc-act { flex-shrink: 0; display: flex; flex-direction: column; gap: 7px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 34px; padding: 0 15px; border-radius: var(--radius-sm);
  font-size: var(--fs-sm); font-weight: 600; font-family: var(--ff);
  border: 1px solid var(--c-line); background: #fff; color: var(--c-text);
  cursor: pointer; white-space: nowrap; transition: .14s;
}
.btn:hover { border-color: var(--c-primary); color: var(--c-primary); text-decoration: none; }
.btn-p { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.btn-p:hover { background: var(--c-primary-d); border-color: var(--c-primary-d); color: #fff; }
.btn-sm { height: 29px; padding: 0 11px; font-size: var(--fs-xs); }

/* ---------- 筛选栏 ---------- */
.filters {
  display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center;
  padding: 15px 18px; background: var(--c-surface);
  border: 1px solid var(--c-line); border-radius: var(--radius); margin-bottom: 18px;
}
.fgroup { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; }
.fgroup > .fl { font-size: var(--fs-xs); color: var(--c-muted); font-weight: 700; margin-right: 2px; }
.fbtn {
  font-size: var(--fs-xs); padding: 4px 11px; border-radius: 13px;
  border: 1px solid var(--c-line); background: #fff; color: var(--c-muted);
  cursor: pointer; font-family: var(--ff); transition: .12s;
}
.fbtn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.fbtn.on { background: var(--c-primary); border-color: var(--c-primary); color: #fff; font-weight: 700; }

.searchbar { display: flex; gap: 10px; margin-bottom: 18px; }
.searchbar input {
  flex: 1; height: 44px; padding: 0 16px; font-size: var(--fs-base);
  font-family: var(--ff); color: var(--c-text);
  border: 1px solid var(--c-line); border-radius: var(--radius); outline: none;
}
.searchbar input:focus { border-color: var(--c-primary); box-shadow: 0 0 0 3px var(--c-primary-l); }

.resultbar { font-size: var(--fs-sm); color: var(--c-muted); margin-bottom: 12px; }
.resultbar b { color: var(--c-primary-d); }

.empty { padding: 52px 20px; text-align: center; color: var(--c-muted); }
.empty h3 { font-size: var(--fs-lg); color: var(--c-ink); margin-bottom: 8px; }

/* ---------- 详情页 ---------- */
.crumb { font-size: var(--fs-sm); color: var(--c-muted); padding: 18px 0 0; }
.crumb a { color: var(--c-muted); }
.detail-grid { display: grid; grid-template-columns: minmax(0, 1fr) 296px; gap: 34px; align-items: start; }
.detail h1 { font-size: var(--fs-2xl); color: var(--c-primary-d); line-height: 1.35; margin-bottom: 10px; }
.detail .sub { font-size: var(--fs-lg); color: var(--c-muted); margin-bottom: 20px; }
.detail .body { margin: 22px 0; }
.detail .body p { margin-bottom: 14px; }
.detail .body h3 { font-size: var(--fs-lg); color: var(--c-primary-d); margin: 24px 0 10px; }
.detail .body ul { margin: 0 0 14px 20px; }
.detail .body li { margin-bottom: 6px; }
.detail .body table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: var(--fs-sm); }
.detail .body th { background: var(--c-primary-l); color: var(--c-primary-d); text-align: left; }
.detail .body th, .detail .body td { border: 1px solid var(--c-line); padding: 7px 10px; }

.panel { border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.panel + .panel { margin-top: 16px; }
.panel-h { padding: 11px 15px; background: var(--c-surface); border-bottom: 1px solid var(--c-line); font-size: var(--fs-sm); font-weight: 700; color: var(--c-ink); }
.panel-b { padding: 15px; }
.kv { display: flex; justify-content: space-between; gap: 12px; font-size: var(--fs-sm); padding: 6px 0; border-bottom: 1px dashed var(--c-line-l); }
.kv:last-child { border-bottom: 0; }
.kv .k { color: var(--c-muted); flex-shrink: 0; }
.kv .v { color: var(--c-ink); text-align: right; word-break: break-all; }

.preview { border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; background: var(--c-surface); }
.preview iframe { width: 100%; height: 640px; border: 0; display: block; background: #fff; }
.preview img, .preview video { width: 100%; display: block; }
.preview audio { width: 100%; margin: 14px; width: calc(100% - 28px); }
.preview .ph { padding: 54px 20px; text-align: center; color: var(--c-muted); font-size: var(--fs-sm); }

/* ---------- 相关条目 ---------- */
.related { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.rcard { padding: 14px 16px; border: 1px solid var(--c-line); border-radius: var(--radius); background: #fff; }
.rcard:hover { border-color: var(--c-primary); }
.rcard h5 { font-size: var(--fs-sm); font-weight: 700; color: var(--c-ink); margin-bottom: 5px; line-height: 1.55; }
.rcard p { font-size: var(--fs-xs); color: var(--c-muted); }
.rcard a { color: inherit; }
.rcard a:hover { color: var(--c-primary); text-decoration: none; }

/* ---------- 命中高亮 ---------- */
mark { background: #FFF3BF; color: inherit; padding: 0 2px; border-radius: 2px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--c-line); margin-top: 56px; padding: 30px 0 40px; background: var(--c-surface); }
.footer-in { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; display: flex; flex-wrap: wrap; gap: 20px; justify-content: space-between; font-size: var(--fs-sm); color: var(--c-muted); }
.footer a { color: var(--c-muted); }
.footer .cols { display: flex; gap: 40px; flex-wrap: wrap; }
.footer .cols b { display: block; color: var(--c-ink); font-size: var(--fs-xs); margin-bottom: 7px; letter-spacing: .5px; }
.footer .cols a { display: block; margin-bottom: 4px; }

/* ---------- 提示条 ---------- */
.notice {
  padding: 13px 17px; border-radius: var(--radius); font-size: var(--fs-sm);
  background: var(--c-warn-l); border: 1px solid #F3D9AE; color: #7C4A08;
}
.notice.info { background: var(--c-primary-l); border-color: #B5D4F4; color: var(--c-primary-d); }
.notice strong { font-weight: 700; }

/* ==========================================================================
   嵌入式知识库扩展（版块卡、学习路径、站内阅读正文）
   ========================================================================== */

/* ---------- 版块卡片 ---------- */
.cat { border-left: 0; }
.cat::before { background: var(--accent, var(--c-primary)); }
.cat-top { display: flex; align-items: baseline; gap: 8px; margin-bottom: 7px; }
.cat-name { font-size: var(--fs-lg); font-weight: 700; color: var(--c-primary-d); }
.cat-short {
  font-size: 10px; font-weight: 700; letter-spacing: .6px; color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, #fff);
  padding: 1px 7px; border-radius: 9px;
}
.cat-foot { margin-top: 12px; padding-top: 10px; border-top: 1px dashed var(--c-line); }
.cat-n { display: block; font-size: var(--fs-xs); font-weight: 700; color: var(--accent); }
.cat-subs { display: block; margin-top: 4px; font-size: 11px; color: var(--c-muted); line-height: 1.6; }

/* ---------- 资料条目补充 ---------- */
.sub2 { font-size: var(--fs-sm); color: var(--c-muted); margin-top: 3px; }
.doc-meta .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 5px; vertical-align: middle; }
.doc-ic { font-size: 10px; letter-spacing: .3px; }
.b-chip  { background: #E8F0FE; color: #1565C0; }
.b-periph{ background: #E0F2F0; color: #00796B; }
.b-tool  { background: #ECE6FA; color: #5B3FA8; }
.b-rtos  { background: #FDF0DC; color: #B45309; }
.b-comm  { background: #FBE3E1; color: #B3261E; }
.b-hw    { background: #E3F3E4; color: #2E7D32; }
.b-algo  { background: #DCF1F6; color: #0E7490; }
.b-debug { background: #EEF1F5; color: #64748B; }
.b-proj  { background: #E3EAF6; color: #0D3C7A; }

/* ---------- 学习路径 ---------- */
.pstrip { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; }
.pstep {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 14px 16px; border: 1px solid var(--c-line); border-radius: var(--radius); background: #fff;
}
.pstep .pidx {
  flex-shrink: 0; width: 26px; height: 26px; border-radius: 50%;
  background: var(--c-primary-l); color: var(--c-primary-d);
  font-size: var(--fs-sm); font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.pstep .ptitle { font-size: var(--fs-sm); font-weight: 700; color: var(--c-ink); }
.pstep .pmeta { font-size: 11px; color: var(--c-muted); margin-top: 3px; }

.pnode { border: 1px solid var(--c-line); border-radius: var(--radius-lg); background: #fff; padding: 20px 22px; margin-bottom: 16px; }
.phead { display: flex; gap: 14px; align-items: flex-start; }
.pnum {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: #fff; font-size: var(--fs-lg); font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.phead h3 { font-size: var(--fs-lg); color: var(--c-primary-d); line-height: 1.35; }
.pmeta { font-size: var(--fs-xs); color: var(--c-muted); margin-top: 3px; }
.pgoal { margin: 14px 0 16px; padding: 11px 14px; background: var(--c-surface); border-radius: var(--radius-sm); font-size: var(--fs-sm); }
.pgoal b { color: var(--c-primary-d); }
.pcols { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.pcoltitle { font-size: var(--fs-xs); font-weight: 700; color: var(--c-muted); letter-spacing: .5px; margin-bottom: 9px; padding-bottom: 6px; border-bottom: 1px solid var(--c-line); }
.pitem { display: flex; align-items: center; gap: 9px; padding: 7px 9px; border-radius: var(--radius-sm); color: inherit; }
.pitem:hover { background: var(--c-surface); text-decoration: none; }
.pdot { flex-shrink: 0; width: 7px; height: 7px; border-radius: 50%; }
.pname { flex: 1; font-size: var(--fs-sm); }
.ptype { font-size: 11px; color: var(--c-muted); }
.pempty { font-size: var(--fs-sm); color: var(--c-muted); }
.checklist { margin: 0; padding-left: 4px; list-style: none; }
.checklist li {
  position: relative; padding-left: 22px; margin-bottom: 7px;
  font-size: var(--fs-sm); color: var(--c-text); line-height: 1.65;
}
.checklist li::before {
  content: "□"; position: absolute; left: 2px; top: -1px;
  color: var(--c-primary); font-weight: 700;
}

/* ---------- 详情页徽章 ---------- */
.badges { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 12px; }
.badge {
  display: inline-block; padding: 3px 11px; border-radius: 12px;
  font-size: var(--fs-xs); font-weight: 700; color: #fff;
}
.badge.ghost { background: var(--c-surface) !important; color: var(--c-muted); border: 1px solid var(--c-line); }

/* ---------- 站内阅读正文（由 markdown 转换） ---------- */
.kb-body { font-size: var(--fs-base); line-height: 1.85; }
.kb-body > h3:first-child { margin-top: 0; }
.kb-body h3 {
  font-size: var(--fs-xl); color: var(--c-primary-d); font-weight: 700;
  margin: 34px 0 12px; padding-left: 11px; border-left: 4px solid var(--c-primary);
}
.kb-body h4 { font-size: var(--fs-lg); color: var(--c-ink); font-weight: 700; margin: 24px 0 9px; }
.kb-body h5 { font-size: var(--fs-base); color: var(--c-text); font-weight: 700; margin: 18px 0 7px; }
.kb-body p { margin: 0 0 13px; }
.kb-body strong { color: var(--c-primary-d); font-weight: 700; }
.kb-body code {
  font-family: var(--ff-mono); font-size: 13px;
  background: var(--c-surface); color: var(--c-danger);
  padding: 1px 5px; border-radius: 4px;
}
.kb-body .kb-code {
  background: #F8FAFC; border: 1px solid #E2E8F0; border-left: 4px solid var(--c-muted);
  border-radius: var(--radius-sm); padding: 13px 15px; margin: 0 0 15px;
  overflow-x: auto; font-size: 12.5px; line-height: 1.65;
}
.kb-body .kb-code code { background: none; color: var(--c-text); padding: 0; font-size: 12.5px; }
.kb-body .kb-table { width: 100%; border-collapse: collapse; margin: 0 0 18px; font-size: var(--fs-sm); }
.kb-body .kb-table th {
  background: var(--c-primary-l); color: var(--c-primary-d); font-weight: 700;
  border: 1px solid #C7D5E8; padding: 8px 10px; text-align: left;
}
.kb-body .kb-table td { border: 1px solid var(--c-line); padding: 8px 10px; vertical-align: top; }
.kb-body .kb-table tr:nth-child(even) td { background: #FAFCFE; }
.kb-body .kb-quote {
  background: var(--c-accent-l); border-left: 4px solid var(--c-accent);
  border-radius: var(--radius-sm); padding: 12px 16px; margin: 0 0 15px;
  font-size: var(--fs-sm); color: #14504A;
}
.kb-body .kb-quote p { margin: 0 0 6px; }
.kb-body .kb-quote p:last-child { margin-bottom: 0; }
.kb-body .kb-list { margin: 0 0 15px 22px; }
.kb-body .kb-list li { margin-bottom: 7px; }
.kb-body .kb-check { list-style: none; position: relative; padding-left: 22px; margin-left: -22px; }
.kb-body .kb-check::before { content: "□"; position: absolute; left: 0; color: var(--c-primary); font-weight: 700; }
.kb-body .kb-hr { border: 0; border-top: 1px solid var(--c-line); margin: 26px 0; }
.kb-body > p:first-child { font-size: var(--fs-lg); color: var(--c-muted); }

.mut { font-size: var(--fs-xs); color: var(--c-muted); font-family: var(--ff-mono); }
.num { text-align: right; font-weight: 700; color: var(--c-primary); white-space: nowrap; }

/* ---------- 预览工具栏与全屏阅读 ---------- */
.preview { border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; background: var(--c-surface); }
.preview iframe { width: 100%; height: 760px; border: 0; display: block; background: #fff; }
.pv-bar {
  display: flex; align-items: center; gap: 10px; padding: 8px 12px;
  background: #FFFFFF; border-bottom: 1px solid var(--c-line);
}
.pv-name { font-size: var(--fs-sm); font-weight: 700; color: var(--c-ink); flex: 1; min-width: 0;
           overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pv-ops { display: flex; gap: 6px; flex-shrink: 0; }
.pv-btn {
  height: 27px; padding: 0 11px; border-radius: 6px; font-size: var(--fs-xs); font-weight: 700;
  border: 1px solid var(--c-line); background: #fff; color: var(--c-muted);
  cursor: pointer; font-family: var(--ff); display: inline-flex; align-items: center;
}
.pv-btn:hover { border-color: var(--c-primary); color: var(--c-primary); text-decoration: none; }
/* CSS 全屏兜底（浏览器拒绝 requestFullscreen 时仍可用） */
.preview.fs {
  position: fixed; inset: 0; z-index: 200; border-radius: 0; border: 0;
  display: flex; flex-direction: column; background: #fff;
}
.preview.fs iframe { height: calc(100vh - 44px); }
.preview.fs img, .preview.fs video { flex: 1; object-fit: contain; min-height: 0; }
body.no-scroll { overflow: hidden; }

/* ---------- 在线阅读器（PDF.js 版，替代 iframe，兼容手机） ---------- */
.reader { display: flex; flex-direction: column; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; background: #fff; height: 760px; }
.reader-chrome { display: flex; flex-direction: column; flex: 1 1 auto; min-height: 0; }
.read-bar { height: 44px; flex: 0 0 44px; border-bottom: 1px solid var(--c-line); display: flex; align-items: center; gap: 8px; padding: 0 12px; background: #FFFFFF; }
.read-bar .pv-name { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.reader-body { display: flex; flex: 1 1 auto; min-height: 0; }
.toc { width: 240px; flex: 0 0 240px; border-right: 1px solid var(--c-line); overflow: auto; padding: 10px; background: #FAFBFC; }
.toc-empty { color: var(--c-muted); font-size: var(--fs-sm); padding: 12px; }
/* 目录：条目行 = 折叠箭头 + 标题按钮；子节点单独一层，可整体收起 */
.toc-row { display: flex; align-items: flex-start; gap: 0; }
.toc-kids.hidden { display: none; }
.toc-caret {
  flex: 0 0 18px; width: 18px; height: 24px; padding: 0; border: 0; background: transparent;
  color: var(--c-muted); font-size: 9px; line-height: 24px; text-align: center; cursor: pointer;
  transition: transform .15s ease;
}
.toc-caret.ph { cursor: default; }
.toc-caret.closed { transform: rotate(-90deg); }
.toc-btn {
  flex: 1 1 auto; min-width: 0; text-align: left; background: transparent; border: 0;
  padding: 4px 8px; border-radius: 6px; cursor: pointer; color: var(--c-ink);
  font-size: var(--fs-sm); font-family: var(--ff); line-height: 1.45; word-break: break-word;
}
.toc-btn:hover { background: var(--c-bg); }
.toc-btn.on { background: var(--c-primary); color: #fff; }
.toc-row.lv1 .toc-btn { font-weight: 700; }
.toc-row.lv2 { padding-left: 14px; }
.toc-row.lv3 { padding-left: 28px; }
.toc-row.lv4 { padding-left: 42px; }
/* 没有书签的 PDF：隐藏侧栏与目录按钮，工具栏给一句提示 */
.reader.no-toc .toc { display: none; }
.reader.no-toc #tocToggle { display: none; }
.pv-note { flex: 0 0 auto; font-size: var(--fs-xs); color: var(--c-muted); font-weight: 400; }
.read-main { flex: 1 1 auto; overflow: auto; background: #F3F4F6; padding: 16px; }
.pdf-stack { display: flex; flex-direction: column; align-items: center; gap: 16px; }
/* position 让章节锚点能绝对定位在页内任意高度（不是只能跳到页首） */
.pdf-page { position: relative; background: #fff; box-shadow: 0 2px 8px rgba(0,0,0,.08); margin: 0 auto; }
.toc-anchor { position: absolute; left: 0; top: 0; width: 1px; height: 1px; pointer-events: none; }
.pdf-page canvas { display: block; }
.pdf-status { text-align: center; padding: 40px 20px; color: var(--c-muted); }
.reader-mask { display: none; }
.pv-zoom { font-size: var(--fs-xs); font-weight: 700; color: var(--c-ink); min-width: 40px; text-align: center; }
/* 全屏阅读 */
.reader.fs { position: fixed; inset: 0; z-index: 200; height: 100vh; border-radius: 0; border: 0; }
.reader.fs .reader-chrome { height: 100%; }
.reader.fs .read-main { padding: 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .detail-grid { grid-template-columns: 1fr; }
  .search-mini { width: 170px; }
}
@media (max-width: 780px) {
  .topbar-in { height: auto; padding: 12px 18px; flex-wrap: wrap; gap: 10px; }
  .nav { order: 3; width: 100%; margin-left: 0; overflow-x: auto; }
  .search-mini { margin-left: auto; width: 150px; }
  .hero { padding: 34px 0 30px; }
  .hero h1 { font-size: 25px; }
  .hero .lead { font-size: var(--fs-base); }
  .hero-stats { gap: 22px; }
  .hstat b { font-size: var(--fs-xl); }
  .doc { flex-wrap: wrap; }
  .doc-act { flex-direction: row; width: 100%; }
  .wrap, .footer-in { padding: 0 18px; }
  .preview iframe { height: 420px; }
  .reader { height: 520px; }
  .toc { position: fixed; left: 0; top: 0; bottom: 0; width: 78%; max-width: 280px; z-index: 201; transform: translateX(-110%); transition: transform .2s ease; box-shadow: 2px 0 12px rgba(0,0,0,.12); border-right: 0; }
  .reader.toc-open .toc { transform: translateX(0); }
  .reader.toc-open .reader-mask { display: block; position: fixed; inset: 0; z-index: 200; background: rgba(0,0,0,.35); }
  .pcols { grid-template-columns: 1fr; gap: 18px; }
  .pnode { padding: 16px 15px; }
  .kb-body h3 { font-size: var(--fs-lg); }
  .kb-body .kb-table { font-size: 12px; }
  .kb-body .kb-table th, .kb-body .kb-table td { padding: 6px 7px; }
}
/* ---------- 学习路线栏目 ---------- */
.route { display: flex; flex-direction: column; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.route-row {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 16px; color: inherit; border-top: 1px solid var(--c-line-l);
}
.route-row:first-child { border-top: 0; }
.route-row:hover { background: var(--c-surface); text-decoration: none; }
.route-no {
  flex-shrink: 0; width: 36px; font-size: var(--fs-sm); font-weight: 700;
  color: var(--c-primary); font-variant-numeric: tabular-nums;
}
.route-main { flex: 1; min-width: 0; }
.route-main b { display: block; color: var(--c-ink); font-size: var(--fs-base); }
.route-goal { display: block; color: var(--c-muted); font-size: var(--fs-sm); margin-top: 2px; }
.route-count { flex-shrink: 0; font-size: var(--fs-xs); font-weight: 700; color: var(--c-accent); }
.route-count.wait { color: var(--c-muted); font-weight: 600; }

.stage-head { margin: 8px 0 8px; }
.stage-kicker { font-size: var(--fs-sm); color: var(--c-muted); }
.stage-head h1 { font-size: var(--fs-2xl); color: var(--c-primary-d); line-height: 1.3; margin: 4px 0 8px; }
.stage-head .lead { font-size: var(--fs-lg); color: var(--c-text); max-width: 760px; }
.stage-pre, .stage-desc { font-size: var(--fs-sm); color: var(--c-muted); max-width: 760px; margin-top: 6px; }
.stage-pre b { color: var(--c-ink); }
.block-h { font-size: var(--fs-lg); color: var(--c-primary-d); margin: 26px 0 12px; }

.stage-jump { display: flex; flex-wrap: wrap; gap: 6px; margin: 14px 0 18px; }
.stage-jump a {
  font-size: var(--fs-xs); padding: 4px 8px; border: 1px solid var(--c-line);
  border-radius: 6px; color: var(--c-muted); background: #fff;
}
.stage-jump a:hover { border-color: var(--c-primary); color: var(--c-primary); text-decoration: none; }
.stage-jump a.on { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }

.slots { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.slot {
  display: flex; gap: 12px; padding: 14px 16px;
  border: 1px solid var(--c-line); border-radius: var(--radius); background: #fff;
}
.slot-no {
  flex-shrink: 0; width: 22px; font-size: var(--fs-sm); font-weight: 700; color: var(--c-muted);
}
.slot-main { flex: 1; min-width: 0; }
.slot-title { font-weight: 700; color: var(--c-ink); display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.slot-covers { font-size: var(--fs-sm); color: var(--c-muted); margin-top: 4px; }
.slot-empty { margin-top: 8px; font-size: var(--fs-sm); color: var(--c-muted); }
.wait {
  font-size: 11px; font-weight: 700; color: var(--c-muted);
  border: 1px solid var(--c-line); border-radius: 10px; padding: 1px 8px;
}
.wait.done { color: #0F6B62; background: var(--c-accent-l); border-color: #B7DDD8; }
.slot-doc {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-top: 8px; padding: 10px 12px; border: 1px solid var(--c-line); border-radius: 8px; color: inherit;
}
.slot-doc:hover { border-color: var(--c-primary); text-decoration: none; }
.slot-doc b { display: block; color: var(--c-ink); }
.slot-sum { display: block; font-size: var(--fs-xs); color: var(--c-muted); margin-top: 2px; line-height: 1.6; }
.slot-go { flex-shrink: 0; font-size: var(--fs-xs); font-weight: 700; color: var(--c-primary); }
.slot-extra-h { font-size: var(--fs-lg); color: var(--c-primary-d); margin: 26px 0 12px; }
.slot-mini { list-style: none; }
.slot-mini li {
  display: flex; justify-content: space-between; gap: 10px; align-items: center;
  padding: 6px 0; border-bottom: 1px dashed var(--c-line-l); font-size: var(--fs-sm);
}

.pager { display: flex; gap: 12px; margin-top: 28px; }
.pager a, .pager-empty { flex: 1; }
.pager a {
  display: block; padding: 12px 14px; border: 1px solid var(--c-line); border-radius: var(--radius); color: inherit;
}
.pager a:hover { border-color: var(--c-primary); text-decoration: none; }
.pager .lbl { display: block; font-size: var(--fs-xs); color: var(--c-muted); }
.pager b { color: var(--c-primary-d); }
.file-note {
  margin: 0 0 12px; padding: 10px 12px; border-radius: var(--radius-sm);
  background: var(--c-warn-l); border: 1px solid #F3D9AE; color: #7C4A08; font-size: var(--fs-sm);
}
.badge { background: var(--c-primary); }

@media (max-width: 780px) {
  .hero-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 18px; }
  .sec-head { flex-direction: column; align-items: flex-start; gap: 4px; }
  .sec-head .more { margin-left: 0; }
  .route-row { align-items: flex-start; flex-wrap: wrap; row-gap: 4px; }
  .route-main { flex: 1 1 calc(100% - 56px); }
  .route-count { flex: 1 1 100%; margin-left: 50px; }
  .pager { flex-direction: column; }
  .stage-head h1 { font-size: 24px; }
  .slot-doc { align-items: flex-start; }
}

@media print {
  .topbar, .footer, .doc-act, .filters, .searchbar, .stage-jump, .pager { display: none; }
}