/* ========== 复位与令牌 ========== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--page-bg);
  color: var(--text-dark);
  font-family: var(--font-head);
  font-size: 15px;
  line-height: 1.75;
  font-weight: 500;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
main { display: block; }
img, svg { max-width: 100%; vertical-align: middle; }
a { color: var(--deep-blue); text-underline-offset: 3px; }
h1, h2, h3, h4, h5, h6 { font-weight: 900; line-height: 1.3; margin: 0 0 .5em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; }
button { font-family: inherit; font-size: inherit; appearance: none; }
[hidden] { display: none !important; }

:root {
  --page-bg: #F5E8D8;
  --nav-bg: #E26D5C;
  --card-a: #D1E8E2;
  --card-b: #E0D0F5;
  --accent-yellow: #FFD100;
  --accent-orange: #FF8C00;
  --accent-orange-dark: #B85C00;
  --status-new: #00B5AD;
  --status-hot: #E75480;
  --status-active: #4CAF50;
  --text-dark: #2B2B2B;
  --text-muted: #6C6C6C;
  --border-default: #D9D9D9;
  --deep-blue: #3D5A80;
  --deep-purple: #6A4C93;
  --font-head: "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --radius: 12px;
  --shadow: 0 6px 18px rgba(43,43,43,.12);
  --header-h: 64px;
}

::selection { background: var(--accent-yellow); color: var(--text-dark); }
:focus-visible { outline: 3px solid var(--deep-blue); outline-offset: 2px; border-radius: 4px; }
.site-header :focus-visible,
.site-footer :focus-visible,
.section-coral :focus-visible,
.section-dark :focus-visible { outline-color: var(--accent-yellow); }

/* ========== 工具类 ========== */
.container { width: 100%; max-width: 1240px; margin-inline: auto; padding-inline: 24px; }
.mono { font-family: var(--font-mono); }
.muted { color: var(--text-muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ========== 跳转与滚动进度 ========== */
.skip-link {
  position: fixed;
  top: -56px;
  left: 16px;
  z-index: 300;
  background: var(--text-dark);
  color: #fff;
  padding: 10px 18px;
  font-weight: 700;
  border-radius: 0 0 10px 10px;
  text-decoration: none;
  transition: top .18s ease;
}
.skip-link:focus { top: 0; }
.scroll-progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 300; pointer-events: none; }
.progress-fill { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent-yellow), var(--accent-orange)); }

/* ========== 页头 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  color: #fff;
  border-left: 6px solid var(--deep-blue);
}
.header-inner {
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 24px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 18px;
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  flex-shrink: 0;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--accent-yellow);
  color: var(--nav-bg);
  font-size: 16px;
  font-weight: 900;
  line-height: 1;
}
.brand-text { font-size: 22px; font-weight: 900; letter-spacing: .5px; }
.brand-ver {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 5px;
  background: rgba(43,43,43,.22);
  color: rgba(255,255,255,.92);
}
.primary-nav { margin-left: auto; }
.nav-list {
  display: flex;
  list-style: none;
  gap: 2px;
  counter-reset: navidx;
}
.nav-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 8px;
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  transition: background .16s, color .16s;
}
.nav-list a::before {
  counter-increment: navidx;
  content: "0" counter(navidx);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  opacity: .72;
}
.nav-list a:hover { background: rgba(255,255,255,.16); }
.nav-list a[aria-current="page"] {
  background: var(--accent-yellow);
  color: var(--text-dark);
}
.nav-list a[aria-current="page"]::before { opacity: .7; }

/* ========== 搜索索引 ========== */
.search-wrap { position: relative; flex-shrink: 0; margin-left: 6px; }
.search-open {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255,255,255,.28);
  background: rgba(255,255,255,.14);
  color: #fff;
  padding: 7px 13px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  min-width: 210px;
  transition: background .16s, border-color .16s;
}
.search-open:hover { background: rgba(255,255,255,.24); border-color: rgba(255,255,255,.45); }
.search-icon { flex-shrink: 0; display: block; }
.search-placeholder { color: rgba(255,255,255,.85); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.search-kbd {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 5px;
  border: 1px solid rgba(255,255,255,.35);
  border-radius: 4px;
  color: rgba(255,255,255,.78);
  white-space: nowrap;
}
.search-panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 340px;
  max-width: calc(100vw - 28px);
  background: #fff;
  color: var(--text-dark);
  border-radius: var(--radius);
  box-shadow: 0 16px 34px rgba(43,43,43,.2);
  padding: 16px;
  z-index: 40;
  display: none;
}
.search-panel[data-open] { display: block; }
.search-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* ========== 页头移动按钮 ========== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 0;
  background: rgba(255,255,255,.14);
  border-radius: 10px;
  cursor: pointer;
  padding: 10px;
  flex-shrink: 0;
}
.toggle-bar {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: #fff;
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== 页头响应式 ========== */
@media (max-width: 1023px) {
  :root { --header-h: 56px; }
  .site-header { border-left-width: 4px; }
  .header-inner { gap: 10px; padding-inline: 14px; }
  .brand-text { font-size: 19px; }
  .brand-ver { display: none; }
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    display: none;
    background: var(--nav-bg);
    border-top: 1px solid rgba(255,255,255,.18);
    box-shadow: 0 20px 30px rgba(43,43,43,.24);
    padding: 12px 14px 16px;
  }
  .primary-nav[data-open] { display: block; }
  .nav-list { flex-direction: column; gap: 4px; }
  .nav-list a { padding: 12px 14px; font-size: 15px; width: 100%; }
  .search-wrap { margin-left: 0; }
  .search-open { min-width: 0; width: 42px; height: 42px; padding: 0; justify-content: center; border-radius: 10px; }
  .search-placeholder, .search-kbd { display: none; }
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--deep-blue);
  color: rgba(255,255,255,.82);
  border-left: 6px solid var(--deep-purple);
  margin-top: 48px;
}
.footer-ribbon { height: 4px; background: linear-gradient(90deg, var(--accent-yellow), var(--accent-orange), var(--status-hot)); }
.footer-inner {
  max-width: 1240px;
  margin-inline: auto;
  padding: 44px 24px 20px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
  gap: 36px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 8px;
}
.footer-logo .brand-mark { background: var(--accent-orange); color: #fff; }
.footer-desc { color: rgba(255,255,255,.72); font-size: 13px; margin-bottom: 12px; }
.footer-copy, .footer-icp { font-family: var(--font-mono); font-size: 12px; color: rgba(255,255,255,.6); margin-bottom: 4px; }
.footer-head {
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 2px;
  color: rgba(255,255,255,.62);
  margin-bottom: 14px;
}
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-links a {
  color: rgba(255,255,255,.82);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color .15s;
}
.footer-links a:hover { color: var(--accent-yellow); text-decoration: underline; text-underline-offset: 4px; }
.footer-contact { list-style: none; display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: rgba(255,255,255,.7); }
.footer-contact li { display: flex; gap: 6px; line-height: 1.5; min-width: 0; overflow-wrap: anywhere; }
.footer-contact .contact-label { min-width: 32px; flex-shrink: 0; color: rgba(255,255,255,.58); font-size: 12px; }
.footer-contact a { color: #fff; text-decoration: none; }
.footer-contact a:hover { color: var(--accent-yellow); text-decoration: underline; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.14); margin-top: 24px; }
.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255,255,255,.62);
}
@media (max-width: 1023px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 28px; padding-top: 36px; }
  .footer-brand, .footer-contact-col { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .footer-inner { grid-template-columns: 1fr; }
}

/* ========== 分区与面板 ========== */
.section-a { background: var(--card-a); }
.section-b { background: var(--card-b); }
.section-cream { background: var(--page-bg); }
.section-coral { background: var(--nav-bg); color: #fff; }
.section-dark { background: var(--deep-blue); color: #fff; }
.section-dark .section-title, .section-coral .section-title { color: #fff; }
.section-dark .section-desc, .section-coral .section-desc { color: rgba(255,255,255,.74); }
.section-dark .eyebrow, .section-coral .eyebrow { color: var(--accent-yellow); }
.section-dark a, .section-coral a { color: var(--accent-yellow); }

.panel { background: rgba(255,255,255,.72); border: 1px solid rgba(61,90,128,.12); border-radius: var(--radius); padding: 20px; }
.panel-a { background: var(--card-a); border-color: transparent; }
.panel-b { background: var(--card-b); border-color: transparent; }
.panel-coral { background: var(--nav-bg); color: #fff; }
.panel-dark { background: var(--deep-blue); color: #fff; }
.panel-coral a, .panel-dark a { color: var(--accent-yellow); }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 999px;
  background: var(--deep-blue);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background .18s, transform .18s, box-shadow .18s;
}
.btn:hover { background: var(--deep-purple); transform: translateY(-1px); }
.btn-primary { background: var(--accent-yellow); color: var(--text-dark); }
.btn-primary:hover { background: #E6BD00; color: var(--text-dark); }
.btn-outline { background: transparent; border-color: var(--deep-blue); color: var(--deep-blue); }
.btn-outline:hover { background: var(--deep-blue); color: #fff; }
.btn-coral { background: var(--nav-bg); color: #fff; }
.btn-coral:hover { background: #C94F3D; }
.btn-sm { padding: 6px 14px; font-size: 13px; }

/* ========== 卡片网格 ========== */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
@media (max-width: 720px) { .card-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; } }
.card {
  background: #fff;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card-a { background: var(--card-a); border-color: transparent; }
.card-b { background: var(--card-b); border-color: transparent; }
.card-thumb {
  margin: 16px 16px 0;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  background: linear-gradient(135deg, rgba(61,90,128,.12), rgba(106,76,147,.18));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(61,90,128,.6);
}
.card-head { padding: 16px 16px 0; display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; }
.card-title { font-size: 16px; font-weight: 900; margin: 0; }
.card-body { padding: 10px 16px 4px; flex: 1; }
.card-body p { font-size: 13px; color: var(--text-muted); margin-bottom: 8px; }
.card-foot { padding: 12px 16px 16px; display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }

/* ========== 磁贴矩阵 ========== */
.tile-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
@media (max-width: 480px) { .tile-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; } }
.tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 16px;
  border-radius: var(--radius);
  background: rgba(255,255,255,.72);
  border: 1px solid rgba(61,90,128,.16);
  color: var(--text-dark);
  text-decoration: none;
  min-height: 112px;
  transition: transform .18s, box-shadow .18s, border-color .18s;
}
.tile:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: rgba(61,90,128,.35); }
.tile-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-yellow);
  color: var(--text-dark);
  font-size: 16px;
  font-weight: 900;
}
.tile-icon--coral { background: var(--nav-bg); color: #fff; }
.tile-icon--cyan { background: var(--status-new); color: #fff; }
.tile-icon--purple { background: var(--deep-purple); color: #fff; }
.tile-label { font-size: 14px; font-weight: 900; line-height: 1.3; }
.tile-meta { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); }
.tile-tag { margin-top: auto; }

/* ========== 标签与徽标 ========== */
.tag-group { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border-default);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  color: var(--text-dark);
  transition: border-color .15s, color .15s, background .15s;
}
.tag:hover { border-color: var(--deep-blue); color: var(--deep-blue); }
.tag-desktop { background: rgba(61,90,128,.1); border-color: rgba(61,90,128,.25); }
.tag-android { background: rgba(106,76,147,.1); border-color: rgba(106,76,147,.25); }
.tag-dev { background: rgba(43,43,43,.06); border-color: rgba(43,43,43,.2); font-family: var(--font-mono); }
.tag-new { background: rgba(0,181,173,.12); border-color: rgba(0,181,173,.35); color: #00756F; }
.tag-hot { background: rgba(231,84,128,.12); border-color: rgba(231,84,128,.35); color: #B81E5B; }
.tag-active { background: rgba(76,175,80,.12); border-color: rgba(76,175,80,.35); color: #2E7D32; }

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .5px;
}
.badge-new { background: rgba(0,181,173,.15); color: #00756F; }
.badge-hot { background: rgba(231,84,128,.15); color: #B81E5B; }
.badge-active { background: rgba(76,175,80,.15); color: #2E7D32; }
.badge-stable { background: rgba(61,90,128,.15); color: #2C476E; }
.badge-archived { background: rgba(108,108,108,.15); color: #555555; }

/* ========== 条目列表 ========== */
.item-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}
.item-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 13px 16px;
  border-top: 1px solid var(--border-default);
  text-decoration: none;
  color: var(--text-dark);
  transition: background .15s;
}
.item-row:first-child { border-top: 0; }
.item-row:hover { background: rgba(209,232,226,.32); }
.item-index { font-family: var(--font-mono); font-size: 12px; font-weight: 700; color: var(--accent-orange-dark); text-align: center; }
.item-title { font-size: 14px; font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item-meta { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); white-space: nowrap; }
@media (max-width: 620px) {
  .item-row { grid-template-columns: 26px minmax(0, 1fr); }
  .item-meta { grid-column: 2; }
}

/* ========== 步骤 ========== */
.steps { display: flex; flex-direction: column; }
.step { display: grid; grid-template-columns: 40px 1fr; gap: 14px; padding: 18px 0; border-bottom: 1px dashed var(--border-default); }
.step:last-child { border-bottom: 0; }
.step-index {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--accent-yellow);
  color: var(--text-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-title { font-weight: 900; font-size: 15px; margin-bottom: 4px; }
.step-desc { font-size: 14px; color: var(--text-muted); }

.step-flow {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  counter-reset: stepflow;
  padding-bottom: 4px;
}
.step-flow .step-item {
  flex: 0 0 260px;
  padding: 18px;
  border-left: 1px solid var(--border-default);
  scroll-snap-align: start;
  counter-increment: stepflow;
}
.step-flow .step-item:first-child { border-left: 0; }
.step-flow .step-item::before {
  content: "0" counter(stepflow);
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 900;
  color: var(--accent-orange-dark);
  display: block;
  margin-bottom: 8px;
}
@media (max-width: 640px) { .step-flow .step-item { flex-basis: 78%; } }

/* ========== 指标条 ========== */
.indicator { display: flex; align-items: center; gap: 10px; font-size: 12px; }
.indicator-track { flex: 1; height: 8px; border-radius: 999px; background: rgba(43,43,43,.1); overflow: hidden; min-width: 80px; }
.indicator-fill { display: block; height: 100%; border-radius: inherit; background: var(--accent-orange); }
.indicator-fill--yellow { background: var(--accent-yellow); }
.indicator-fill--green { background: var(--status-active); }
.indicator-fill--cyan { background: var(--status-new); }
.indicator-fill--coral { background: var(--nav-bg); }
.indicator-fill--dark { background: var(--deep-blue); }

/* ========== 索引条 ========== */
.index-bar { display: flex; flex-wrap: wrap; gap: 8px; }
.index-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  background: rgba(255,255,255,.75);
  border: 1px solid rgba(61,90,128,.18);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dark);
  text-decoration: none;
  transition: background .16s, color .16s, border-color .16s;
}
.index-link:hover { background: var(--deep-blue); border-color: var(--deep-blue); color: #fff; }
.index-link[aria-current="true"] { background: var(--accent-orange-dark); border-color: var(--accent-orange-dark); color: #fff; }

/* ========== 横向滑轨 ========== */
.scroll-rail { display: flex; gap: 14px; overflow-x: auto; padding: 4px 2px 12px; scroll-snap-type: x proximity; }
.rail-item { flex: 0 0 240px; scroll-snap-align: start; }
.rail-item--sm { flex-basis: 180px; }
.rail-item--lg { flex-basis: 320px; }
@media (max-width: 640px) {
  .rail-item { flex-basis: 78%; }
  .rail-item--sm { flex-basis: 62%; }
}

/* ========== 表格 ========== */
.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: #fff;
  border: 1px solid var(--border-default);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14px;
}
.data-table th {
  background: var(--deep-blue);
  color: #fff;
  font-weight: 700;
  text-align: left;
  padding: 10px 14px;
  white-space: nowrap;
}
.data-table th[aria-sort] { cursor: pointer; user-select: none; }
.data-table th[aria-sort="ascending"], .data-table th[aria-sort="descending"] { background: var(--deep-purple); }
.data-table th[aria-sort]::after { font-family: var(--font-mono); font-size: 10px; margin-left: 4px; }
.data-table th[aria-sort="ascending"]::after { content: "▲"; }
.data-table th[aria-sort="descending"]::after { content: "▼"; }
.data-table td { padding: 10px 14px; border-top: 1px solid var(--border-default); color: var(--text-dark); }
.data-table tbody tr:hover td { background: rgba(209,232,226,.32); }
.data-table tbody tr:nth-child(even) td { background: rgba(245,232,216,.25); }
.data-table tbody tr:nth-child(even):hover td { background: rgba(209,232,226,.32); }
@media (max-width: 720px) {
  .data-table { font-size: 13px; }
  .data-table th, .data-table td { padding: 8px 10px; }
}

/* ========== 面包屑 ========== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 14px 0;
  font-size: 13px;
  color: var(--text-muted);
  list-style: none;
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--deep-blue); text-decoration: underline; }
.breadcrumb [aria-current="page"] { color: var(--text-dark); font-weight: 700; }
.breadcrumb .sep { color: var(--border-default); }

/* ========== 区块头 ========== */
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.section-title { font-size: 24px; font-weight: 900; line-height: 1.25; margin: 0; }
.section-title .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent-orange-dark);
  margin-bottom: 6px;
}
.section-desc { margin: 6px 0 0; color: var(--text-muted); font-size: 14px; }
.link-more { font-size: 13px; font-weight: 700; color: var(--deep-blue); text-decoration: none; display: inline-flex; align-items: center; gap: 4px; }
.link-more:hover { text-decoration: underline; }

/* ========== 返回顶部 ========== */
.top-link {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 12px;
  background: var(--deep-blue);
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(43,43,43,.28);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .2s, transform .2s, visibility .2s;
  z-index: 120;
}
.top-link[data-visible] { opacity: 1; visibility: visible; transform: translateY(0); }
.top-link:hover { background: var(--deep-purple); }

/* ========== 降级动效 ========== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}