/* ==========================================================================
   环球中心 / site.css
   1 reset · 2 tokens · 3 排版 · 4 布局 · 5 分区 · 6 头部 · 7 页脚
   8 按钮与标签 · 9 卡片与面板 · 10 时间轴与折叠 · 11 目录与面包屑 · 12 图片容器
   ========================================================================== */

/* ---------- 1. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
body, h1, h2, h3, h4, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; }
:where(ul, ol)[class] { list-style: none; }
img, svg, video { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
[id] { scroll-margin-top: 104px; }

/* ---------- 2. tokens ---------- */
:root {
  --deep: #0E1E3A;
  --brand-blue: #1B3A6B;
  --mist: #DCE6F2;
  --amber: #D99A2B;
  --amber-deep: #8A5A12;
  --coral: #F26B4C;
  --coral-deep: #C0431F;
  --warm: #FBF7F1;
  --paper: #FFFFFF;
  --ink: #2C2F36;
  --grey: #6B7280;
  --steel: #7FA3C9;
  --ok: #2F8F5B;
  --ok-ink: #7FD1A4;
  --on-dark: #F2EDE4;

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --gutter: clamp(18px, 4vw, 44px);
  --wrap: 1180px;
  --rail: 88px;
  --header-h: 72px;

  --radius-card: 26px 8px 26px 8px;
  --radius-panel: 22px 6px 22px 6px;
  --radius-sm: 14px 4px 14px 4px;
  --radius-pill: 999px;

  --shadow-1: 0 18px 40px -30px rgba(14, 30, 58, .55);
  --shadow-2: 0 34px 62px -42px rgba(14, 30, 58, .62);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .18s;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink);
  background-color: var(--warm);
  background-image:
    radial-gradient(circle at 6% 3%, rgba(217, 154, 43, .07), transparent 42%),
    radial-gradient(circle at 94% 0%, rgba(27, 58, 107, .09), transparent 46%);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 700; line-height: 1.26; letter-spacing: -.008em; color: var(--deep); }
h1 { font-size: clamp(30px, 4.2vw, 52px); font-weight: 900; line-height: 1.16; }
h2 { font-size: clamp(23px, 2.6vw, 30px); }
h3 { font-family: var(--sans); font-size: 19px; font-weight: 700; line-height: 1.5; }
h4 { font-family: var(--sans); font-size: 16px; font-weight: 700; }
p { margin-bottom: 1.05em; max-width: 42em; }
small, .text-sm { font-size: 14px; line-height: 1.7; }
strong { font-weight: 700; color: var(--deep); }
a { color: var(--amber-deep); text-decoration: none; transition: color var(--dur) var(--ease); }
a:hover { color: var(--coral-deep); }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; letter-spacing: .01em; }
.num { font-family: var(--mono); font-variant-numeric: tabular-nums; font-weight: 600; font-size: clamp(20px, 2.4vw, 28px); color: var(--amber-deep); }
.surface-deep .num, .surface-brand .num, .site-footer .num { color: var(--amber); }

.skip-link {
  position: fixed; left: var(--gutter); top: 10px; z-index: 200;
  padding: 11px 18px; background: var(--deep); color: var(--on-dark);
  border-radius: var(--radius-sm); font-size: 14px; font-weight: 700;
  transform: translateY(-180%); transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: translateY(0); color: var(--on-dark); }

:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 4px; }
.surface-deep :focus-visible, .surface-brand :focus-visible, .site-footer :focus-visible { outline-color: #F2C56B; }

/* ---------- 4. 布局 ---------- */
.wrap { width: min(100% - (2 * var(--gutter)), var(--wrap)); margin-inline: auto; }
.wrap--wide { --wrap: 1360px; }
.main-offset { padding-top: clamp(96px, 13vw, 132px); }

.shell {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 46px);
  width: min(100% - (2 * var(--gutter)), 1320px);
  margin-inline: auto;
  align-items: start;
}
.rail {
  position: sticky; top: 104px; align-self: start;
  display: flex; flex-direction: column; gap: 18px; padding-top: 10px;
}
.rail__label {
  writing-mode: vertical-rl; font-family: var(--mono); font-size: 12px;
  letter-spacing: .3em; color: var(--grey); text-transform: uppercase;
}
.rail__list { display: grid; gap: 12px; }
.rail__node { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--grey); }
.rail__node::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--mist); flex: none; }
.rail__node[aria-current="true"] { color: var(--deep); }
.rail__node[aria-current="true"]::before { background: var(--amber); box-shadow: 0 0 0 3px rgba(217, 154, 43, .2); }

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(30px, 4vw, 56px); }
.section-head { display: grid; gap: 10px; margin-bottom: clamp(22px, 3vw, 38px); max-width: 54em; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--amber-deep);
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--amber); }
.surface-deep .eyebrow, .surface-brand .eyebrow { color: var(--amber); }
.lede { font-size: 17px; color: #4A4F58; max-width: 36em; }
.surface-deep .lede, .surface-brand .lede { color: rgba(242, 237, 228, .78); }

.grid { display: grid; gap: clamp(16px, 2.2vw, 30px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: start; }

/* ---------- 5. 分区表面 ---------- */
.surface-deep {
  background-color: var(--deep); color: var(--on-dark);
  background-image: repeating-linear-gradient(150deg, rgba(242, 237, 228, .05) 0 1px, transparent 1px 10px);
}
.surface-brand {
  background-color: var(--brand-blue); color: var(--on-dark);
  background-image: repeating-linear-gradient(150deg, rgba(242, 237, 228, .045) 0 1px, transparent 1px 11px);
}
.surface-mist { background-color: var(--mist); }
.surface-deep h1, .surface-deep h2, .surface-deep h3, .surface-deep h4,
.surface-brand h1, .surface-brand h2, .surface-brand h3, .surface-brand h4 { color: var(--on-dark); }
.surface-deep a, .surface-brand a { color: var(--amber); }
.surface-deep a:hover, .surface-brand a:hover { color: #F0BE6A; }
.surface-deep strong, .surface-brand strong { color: var(--on-dark); }

/* ---------- 6. 头部 ---------- */
.site-header {
  position: fixed; inset: 0 0 auto; z-index: 90;
  color: var(--on-dark);
  text-shadow: 0 1px 14px rgba(14, 30, 58, .34);
  background-color: transparent;
  transition: background-color .22s var(--ease), color .22s var(--ease), box-shadow .22s var(--ease);
}
.site-header__inner {
  display: flex; align-items: center; gap: clamp(10px, 1.6vw, 26px);
  width: min(100% - (2 * var(--gutter)), 1320px);
  margin-inline: auto;
  padding-block: 14px; min-height: var(--header-h);
  transition: padding .22s var(--ease), min-height .22s var(--ease);
}
.site-header[data-scrolled] {
  background-color: rgba(251, 247, 241, .95);
  color: var(--ink);
  text-shadow: none;
  box-shadow: 0 1px 0 rgba(14, 30, 58, .1), 0 22px 44px -38px rgba(14, 30, 58, .8);
  backdrop-filter: blur(10px);
}
.site-header[data-scrolled] .site-header__inner { padding-block: 8px; min-height: 58px; }

.header-progress {
  position: absolute; left: 0; right: 0; bottom: 0; height: 2px; display: block;
  opacity: 0; transition: opacity .22s var(--ease); pointer-events: none;
}
.site-header[data-scrolled] .header-progress { opacity: 1; }
.header-progress__bar {
  display: block; height: 100%; width: 100%;
  transform: scaleX(0); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--amber), var(--coral));
}

.brand { display: inline-flex; align-items: center; gap: 12px; flex: none; color: inherit; padding: 6px 8px; border-radius: var(--radius-sm); transition: background-color var(--dur) var(--ease); }
.brand:hover { color: inherit; background-color: rgba(217, 154, 43, .14); }
.brand__mark {
  position: relative; flex: none; width: 36px; height: 36px;
  border-radius: 12px 4px 12px 4px;
  background: linear-gradient(140deg, var(--amber) 0 46%, var(--brand-blue) 46% 100%);
  box-shadow: inset 0 0 0 1px rgba(251, 247, 241, .2);
}
.brand__ring { position: absolute; inset: 8px; border: 1.5px solid rgba(251, 247, 241, .85); border-radius: 50%; }
.brand__dot { position: absolute; right: 5px; top: 5px; width: 6px; height: 6px; border-radius: 50%; background: var(--coral); box-shadow: 0 0 0 2px rgba(14, 30, 58, .38); }
.brand__text { display: flex; flex-direction: column; line-height: 1.18; }
.brand__name { font-family: var(--serif); font-weight: 900; font-size: 18px; letter-spacing: .04em; }
.brand__tagline { font-size: 11.5px; letter-spacing: .1em; opacity: .72; }

.nav { flex: 1 1 auto; display: flex; justify-content: center; }
.nav__list { display: flex; align-items: center; justify-content: center; gap: 2px; }
.nav__link {
  position: relative; display: inline-block; padding: 8px 12px;
  font-size: 15px; font-weight: 500; color: inherit;
  border-radius: var(--radius-sm);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.nav__link:hover { color: inherit; background-color: rgba(217, 154, 43, .18); }
.site-header[data-scrolled] .nav__link:hover { background-color: var(--mist); }
.nav__link[aria-current="page"] { color: var(--amber); box-shadow: inset 0 0 0 1px rgba(217, 154, 43, .55); }
.nav__link[aria-current="page"]::after {
  content: ""; position: absolute; left: 50%; bottom: 1px; width: 5px; height: 5px;
  margin-left: -2.5px; border-radius: 50%; background: var(--amber);
}
.site-header[data-scrolled] .nav__link[aria-current="page"] { color: var(--amber-deep); }
.nav__foot { display: none; }

.header-actions { flex: none; display: flex; align-items: center; gap: 10px; }

.nav-toggle {
  display: none; align-items: center; gap: 9px;
  padding: 10px 13px; font-size: 13.5px; font-weight: 700; letter-spacing: .06em;
  border: 1px solid rgba(242, 237, 228, .34); border-radius: var(--radius-sm);
  color: inherit; transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--amber); }
.site-header[data-scrolled] .nav-toggle { border-color: rgba(14, 30, 58, .24); }
.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars span { display: block; height: 2px; background: currentColor; border-radius: 2px; transition: transform var(--dur) var(--ease); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child { transform: translateY(-3px) rotate(-45deg); }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 96px);
  background-color: var(--deep); color: var(--on-dark);
  background-image: repeating-linear-gradient(150deg, rgba(242, 237, 228, .045) 0 1px, transparent 1px 10px);
  border-top: 3px solid var(--amber);
}
.site-footer__inner { width: min(100% - (2 * var(--gutter)), 1320px); margin-inline: auto; padding-block: clamp(34px, 5vw, 64px); }
.footer-band { display: grid; gap: clamp(20px, 3vw, 44px); padding-block: clamp(20px, 3vw, 32px); }
.footer-band:first-child { padding-top: 0; }
.footer-band:last-child { padding-bottom: 0; }
.footer-band + .footer-band { border-top: 1px solid rgba(242, 237, 228, .14); }
.footer-band--top { grid-template-columns: minmax(230px, 1fr) minmax(0, 2fr); align-items: start; }
.footer-brand__mark {
  display: inline-block; padding-bottom: 8px; border-bottom: 2px solid var(--amber);
  font-family: var(--serif); font-weight: 900; font-size: 22px; letter-spacing: .1em; color: var(--on-dark);
}
.footer-brand__mark:hover { color: var(--amber); }
.footer-brand__line { margin-top: 14px; font-size: 14px; color: rgba(242, 237, 228, .66); max-width: 22em; }
.footer-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(16px, 2vw, 30px); }
.footer-nav__title { font-family: var(--sans); font-size: 12.5px; font-weight: 700; letter-spacing: .2em; color: var(--amber); margin-bottom: 14px; }
.footer-nav__list { display: grid; gap: 9px; font-size: 14.5px; }
.footer-nav__list a { color: rgba(242, 237, 228, .82); border-bottom: 1px solid transparent; padding-bottom: 2px; }
.footer-nav__list a:hover { color: var(--on-dark); border-color: var(--amber); }

.footer-band--contact { grid-template-columns: minmax(0, 2fr) minmax(230px, 1fr); align-items: start; }
.footer-contact { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.footer-contact__item { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: 14.5px; }
.footer-contact__key { flex: 1 0 100%; font-size: 12.5px; letter-spacing: .16em; color: rgba(242, 237, 228, .52); }
.footer-contact__val { color: var(--on-dark); }
.footer-contact__note { font-size: 13.5px; line-height: 1.8; color: rgba(242, 237, 228, .62); max-width: 28em; }

.copy-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 11px; font-size: 12.5px;
  border: 1px solid rgba(242, 237, 228, .3); border-radius: 10px 3px 10px 3px;
  color: rgba(242, 237, 228, .8);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.copy-btn:hover { border-color: var(--amber); color: var(--amber); }
.copy-btn[data-copied="ok"] { color: var(--ok-ink); border-color: var(--ok-ink); background-color: rgba(47, 143, 91, .16); }
.copy-btn[data-copied="fail"] { color: var(--coral); border-color: var(--coral); }

.footer-band--legal {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between;
  gap: 10px 26px; font-size: 13px; color: rgba(242, 237, 228, .58);
}
.footer-legal__line { font-family: var(--mono); letter-spacing: .04em; }
.footer-legal__note { max-width: 44em; font-size: 13px; line-height: 1.8; }
.footer-legal__copy { font-size: 13px; }

/* ---------- 8. 按钮与标签 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 19px; font-family: var(--sans); font-size: 14.5px; font-weight: 700; line-height: 1;
  border: 1px solid transparent; border-radius: var(--radius-sm);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--urgent { background-color: var(--coral-deep); color: var(--on-dark); box-shadow: 0 10px 26px -16px rgba(192, 67, 31, .95); }
.btn--urgent:hover { background-color: #A93718; color: var(--on-dark); }
.btn--amber { background-color: var(--amber); color: #1A1405; }
.btn--amber:hover { background-color: #C98A1F; color: #1A1405; }
.btn--solid { background-color: var(--deep); color: var(--on-dark); }
.btn--solid:hover { background-color: var(--brand-blue); color: var(--on-dark); }
.btn--quiet { background-color: var(--mist); color: var(--brand-blue); }
.btn--quiet:hover { background-color: #CFDDEE; color: var(--brand-blue); }
.btn--ghost { border-color: currentColor; color: inherit; opacity: .88; }
.btn--ghost:hover { opacity: 1; color: inherit; border-color: var(--amber); }

.pill {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 4px 12px; font-size: 12.5px; font-weight: 700; letter-spacing: .04em;
  border-radius: var(--radius-pill); border: 1px solid transparent;
}
.pill--amber { background-color: rgba(217, 154, 43, .16); color: var(--amber-deep); border-color: rgba(217, 154, 43, .4); }
.pill--coral { background-color: rgba(242, 107, 76, .16); color: var(--coral-deep); border-color: rgba(192, 67, 31, .38); }
.pill--green { background-color: rgba(47, 143, 91, .14); color: var(--ok); border-color: rgba(47, 143, 91, .34); }
.pill--steel { background-color: var(--mist); color: var(--brand-blue); border-color: #C6D5E8; }
.surface-deep .pill--amber, .surface-brand .pill--amber { color: var(--amber); }
.surface-deep .pill--green, .surface-brand .pill--green { color: var(--ok-ink); }

.status-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--steel); flex: none; }
.status-dot--ok { background: var(--ok); }
.status-dot--wait { background: var(--amber); }
.status-dot--urgent { background: var(--coral-deep); }
.surface-deep .status-dot--ok, .site-footer .status-dot--ok { background: var(--ok-ink); }

/* ---------- 9. 卡片与面板 ---------- */
.card {
  background-color: var(--paper);
  border: 1px solid var(--mist);
  border-radius: var(--radius-card);
  padding: clamp(18px, 2.4vw, 28px);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card:hover { transform: translateY(-2px); border-color: var(--amber); box-shadow: var(--shadow-1); }
.card__title { font-family: var(--sans); font-size: 18px; font-weight: 700; color: var(--deep); margin-bottom: 8px; }
.card__meta { font-size: 13px; color: var(--grey); }
.card__body { font-size: 15.5px; }
.card--urgent { border-color: var(--coral); box-shadow: inset 3px 0 0 var(--coral-deep); }
.card--urgent:hover { border-color: var(--coral-deep); }
.card--flat { border-radius: var(--radius-sm); }

.console {
  background-color: var(--deep); color: var(--on-dark);
  border: 1px solid rgba(217, 154, 43, .3);
  border-radius: var(--radius-panel);
  padding: 16px 18px;
}
.console__row {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 9px 0; font-size: 14px;
  border-bottom: 1px dashed rgba(242, 237, 228, .16);
}
.console__row:last-child { border-bottom: 0; }
.console__key { display: inline-flex; align-items: center; gap: 8px; color: rgba(242, 237, 228, .72); }
.console__val { font-family: var(--mono); font-variant-numeric: tabular-nums; color: var(--amber); font-size: 15px; }

.aside-note {
  border-left: 2px solid var(--amber);
  padding: 4px 0 4px 14px;
  font-size: 14px; line-height: 1.8; color: var(--grey);
  max-width: 28em;
}
.surface-deep .aside-note, .surface-brand .aside-note { color: rgba(242, 237, 228, .72); }

/* ---------- 10. 时间轴与折叠 ---------- */
.timeline { display: grid; gap: 0; }
.timeline__item { position: relative; display: grid; grid-template-columns: 52px minmax(0, 1fr); gap: 26px; padding-bottom: clamp(22px, 3vw, 32px); }
.timeline__item::before {
  content: ""; position: absolute; left: 66px; top: 26px; bottom: 0; width: 2px;
  background: linear-gradient(var(--mist), rgba(220, 230, 242, .25));
}
.timeline__item:last-child::before { display: none; }
.timeline__item::after {
  content: ""; position: absolute; left: 59px; top: 6px; width: 16px; height: 16px;
  border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 4px rgba(217, 154, 43, .18);
}
.timeline__num { font-family: var(--mono); font-size: 16px; line-height: 1.5; color: var(--amber-deep); text-align: right; }
.timeline__body { padding-top: 1px; }
.surface-deep .timeline__item::before, .surface-brand .timeline__item::before { background: linear-gradient(rgba(242, 237, 228, .28), rgba(242, 237, 228, .06)); }
.surface-deep .timeline__num, .surface-brand .timeline__num { color: var(--amber); }

.disclosure { border-bottom: 1px solid var(--mist); }
.disclosure summary {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 17px 0; font-size: 17px; font-weight: 700; color: var(--deep);
  cursor: pointer; list-style: none;
  transition: color var(--dur) var(--ease);
}
.disclosure summary::-webkit-details-marker { display: none; }
.disclosure summary::after { content: "+"; margin-left: auto; font-family: var(--mono); font-size: 20px; line-height: 1; color: var(--amber-deep); }
.disclosure[open] summary::after { content: "−"; }
.disclosure summary:hover { color: var(--amber-deep); }
.disclosure__body { padding: 0 0 22px; font-size: 15.5px; color: #464B54; }
.surface-deep .disclosure, .surface-brand .disclosure { border-color: rgba(242, 237, 228, .16); }
.surface-deep .disclosure summary, .surface-brand .disclosure summary { color: var(--on-dark); }
.surface-deep .disclosure__body, .surface-brand .disclosure__body { color: rgba(242, 237, 228, .78); }

/* ---------- 11. 目录与面包屑 ---------- */
.toc {
  position: sticky; top: 104px;
  background-color: var(--paper); border: 1px solid var(--mist);
  border-radius: var(--radius-panel); padding: 18px;
}
.toc__title { font-family: var(--mono); font-size: 12.5px; letter-spacing: .18em; color: var(--grey); margin-bottom: 12px; }
.toc__list { display: grid; gap: 3px; }
.toc__link {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; font-size: 14.5px; color: var(--grey);
  border-radius: 10px 3px 10px 3px;
  transition: color .16s var(--ease), background-color .16s var(--ease), box-shadow .16s var(--ease);
}
.toc__link:hover { color: var(--deep); background-color: rgba(220, 230, 242, .55); }
.toc__link[aria-current="true"] { color: var(--deep); background-color: var(--mist); box-shadow: inset 2px 0 0 var(--amber); }

.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 18px; font-size: 13.5px; color: var(--grey); }
.breadcrumbs li { display: flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before { content: "/"; color: var(--steel); }
.breadcrumbs a { color: inherit; border-bottom: 1px solid transparent; padding-bottom: 1px; }
.breadcrumbs a:hover { color: var(--amber-deep); border-color: currentColor; }
.surface-deep .breadcrumbs, .surface-brand .breadcrumbs { color: rgba(242, 237, 228, .72); }
.surface-deep .breadcrumbs a:hover, .surface-brand .breadcrumbs a:hover { color: var(--amber); }

/* ---------- 12. 图片容器 ---------- */
.media-frame {
  position: relative; overflow: hidden;
  border-radius: var(--radius-card);
  background-color: var(--mist);
  aspect-ratio: 16 / 10;
}
.media-frame > img, .media-frame > picture > img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--cut { border-radius: 34px 6px 34px 6px; }
.media-frame__caption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 26px 18px 14px; font-size: 13px; color: var(--on-dark);
  background: linear-gradient(transparent, rgba(14, 30, 58, .78));
}

/* ---------- 13. 显现与动效 ---------- */
html.js [data-reveal] { opacity: 0; transform: translateY(14px); }
html.js [data-reveal].is-revealed { opacity: 1; transform: none; transition: opacity .32s var(--ease), transform .32s var(--ease); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .btn:hover, .card:hover { transform: none; }
  .site-header .header-progress__bar { transition: none; }
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1180px) {
  .brand__tagline { display: none; }
}
@media (max-width: 1024px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .rail { display: none; }
  .toc { position: static; }

  .site-header__inner { justify-content: space-between; flex-wrap: wrap; }
  .brand { flex: 1 1 auto; }
  .nav-toggle { display: inline-flex; }
  .header-actions__ghost { display: none; }
  .nav {
    position: absolute; top: calc(100% + 8px); left: var(--gutter); right: var(--gutter);
    display: none; flex-direction: column; align-items: stretch; justify-content: flex-start;
    gap: 6px; padding: 16px;
    background-color: var(--deep); color: var(--on-dark);
    background-image: repeating-linear-gradient(150deg, rgba(242, 237, 228, .05) 0 1px, transparent 1px 10px);
    border: 1px solid rgba(217, 154, 43, .32);
    border-radius: var(--radius-panel);
    box-shadow: 0 28px 56px -28px rgba(14, 30, 58, .85);
    max-height: calc(100dvh - 120px); overflow-y: auto;
    text-shadow: none;
  }
  .nav[data-open] { display: flex; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav__link { padding: 13px 14px; font-size: 16px; color: var(--on-dark); border-radius: var(--radius-sm); }
  .nav__link:hover { background-color: rgba(217, 154, 43, .18); }
  .nav__link[aria-current="page"] { color: var(--amber); background-color: rgba(217, 154, 43, .12); }
  .nav__link[aria-current="page"]::after { display: none; }
  .nav__foot { display: block; padding-top: 10px; border-top: 1px solid rgba(242, 237, 228, .16); }
  .nav__foot .btn { width: 100%; color: var(--on-dark); border-color: rgba(242, 237, 228, .38); }
  .nav__foot .btn:hover { border-color: var(--amber); color: var(--amber); }
}
@media (max-width: 980px) {
  .grid--split { grid-template-columns: minmax(0, 1fr); }
  .footer-band--top, .footer-band--contact { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .grid--2 { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .timeline__item { grid-template-columns: 34px minmax(0, 1fr); gap: 16px; }
  .timeline__item::after { left: 32px; width: 12px; height: 12px; top: 8px; }
  .timeline__item::before { left: 37px; top: 26px; }
  .timeline__num { font-size: 14px; }
}
@media (max-width: 480px) {
  .brand__name { font-size: 16px; }
  .btn { padding: 11px 15px; font-size: 14px; }
  .nav-toggle__label { display: none; }
  .footer-band--legal { flex-direction: column; align-items: flex-start; }
}