/* ============================================================
   澳六 CN — 共享样式 /assets/site.css
   夜间海港 · 侧边导览式布局 · 档案夹卡片系统
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body,
h1, h2, h3, h4, h5,
p, ul, ol, li, figure, blockquote, dl, dd, address {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

img, svg, video { display: block; max-width: 100%; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色彩 */
  --c-deepest: #06132A;
  --c-sea: #0B1E3A;
  --c-harbor: #12294A;
  --c-tide: #1E3A63;
  --c-coral: #FF6B4A;
  --c-gold: #F5C26B;
  --c-jade: #2EC4B6;
  --c-light: #EAF0F8;
  --c-mist: #93A7C4;
  --c-deck: #F7EFE3;

  /* 圆角 */
  --r-sm: 14px;
  --r-md: 20px;
  --r-lg: 28px;
  --r-pill: 999px;

  /* 尺度 */
  --rail-w: 96px;
  --bar-h: 76px;
  --bar-h-shrink: 56px;
  --shell: 1240px;
  --shell-wide: 1480px;
  --gutter: clamp(18px, 4vw, 48px);

  /* 字体 */
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 动效 */
  --t-fast: 180ms;
  --t-mid: 320ms;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --shadow-lift: 0 18px 44px -26px rgba(6, 19, 42, .95);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  padding-top: var(--bar-h);
  background-color: var(--c-sea);
  background-image:
    radial-gradient(120% 60% at 82% -8%, rgba(30, 58, 99, .55), transparent 62%),
    radial-gradient(90% 46% at 6% 4%, rgba(255, 107, 74, .09), transparent 60%);
  background-repeat: no-repeat;
  color: var(--c-light);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
}

@media (min-width: 1200px) {
  body { font-size: 17px; }
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--c-light);
}

p { max-width: 72ch; }

strong { font-weight: 900; color: var(--c-light); }

::selection { background: var(--c-coral); color: var(--c-sea); }

.mono-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: .02em;
}

#main-content { scroll-margin-top: calc(var(--bar-h) + 20px); }

:focus-visible {
  outline: 2px solid var(--c-coral);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 容器与网格 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.shell--wide { max-width: var(--shell-wide); }

.grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 7 : 4 主内容 + 悬浮索引 */
.grid--split {
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  align-items: start;
}

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }
.section--harbor { background-color: var(--c-harbor); }
.section--deck {
  background-color: var(--c-deck);
  color: var(--c-sea);
}
.section--deck h1,
.section--deck h2,
.section--deck h3,
.section--deck h4,
.section--deck strong { color: var(--c-sea); }

.stagger-1 { margin-top: 32px; }
.stagger-2 { margin-top: 64px; }
.stagger-3 { margin-top: 96px; }

.section-head { display: grid; gap: 14px; margin-bottom: clamp(24px, 3vw, 44px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .24em;
  color: var(--c-gold);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--c-coral);
}

.section-title { font-size: clamp(28px, 4vw, 44px); }
.section-lede { font-size: 17px; color: var(--c-mist); }

/* 纵向小注释 */
.v-note {
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--c-mist);
}
.v-note--jade { color: var(--c-jade); }
.v-note--gold { color: var(--c-gold); }

/* 面包屑 */
.breadcrumbs {
  font-size: 13px;
  color: var(--c-mist);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumbs li + li::before {
  content: "/";
  color: var(--c-tide);
}
.breadcrumbs a { color: var(--c-mist); transition: color var(--t-fast) var(--ease); }
.breadcrumbs a:hover { color: var(--c-coral); }
.breadcrumbs [aria-current="page"] { color: var(--c-gold); }

/* ---------- 5. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--r-pill);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  overflow: hidden;
  transition: transform var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
}
.btn::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: 42%;
  background: linear-gradient(90deg, transparent, rgba(234, 240, 248, .38), transparent);
  transform: translateX(-130%);
  transition: transform 900ms var(--ease);
  pointer-events: none;
}
.btn:hover::after { transform: translateX(300%); }

.btn--primary {
  background-color: var(--c-coral);
  color: var(--c-sea);
  box-shadow: 0 14px 32px -18px rgba(255, 107, 74, .95);
}
.btn--primary:hover { background-color: #FF8265; transform: translateY(-2px); }

.btn--ghost {
  border: 1px solid var(--c-tide);
  background-color: rgba(18, 41, 74, .55);
  color: var(--c-light);
}
.btn--ghost:hover { border-color: var(--c-jade); color: var(--c-jade); }

.btn--jade { background-color: var(--c-jade); color: var(--c-deepest); }
.btn--jade:hover { background-color: #47D6C9; transform: translateY(-2px); }

.btn--sm { padding: 9px 18px; font-size: 13px; }

/* ---------- 6. 胶囊标签 / 筛选 ---------- */
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  border: 1px solid var(--c-tide);
  border-radius: var(--r-pill);
  background-color: rgba(18, 41, 74, .6);
  color: var(--c-mist);
  font-size: 13px;
  transition: color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}
.chip:hover,
.chip.is-active,
.chip[aria-pressed="true"] {
  border-color: var(--c-coral);
  background-color: rgba(255, 107, 74, .14);
  color: var(--c-light);
}
.chip--jade:hover,
.chip--jade.is-active,
.chip--jade[aria-pressed="true"] {
  border-color: var(--c-jade);
  background-color: rgba(46, 196, 182, .16);
  color: var(--c-jade);
}

/* ---------- 7. 档案夹卡片 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(20px, 2.2vw, 30px);
  border: 1px solid var(--c-tide);
  border-radius: var(--r-lg);
  background-color: var(--c-harbor);
  box-shadow: var(--shadow-lift);
  transition: transform var(--t-mid) var(--ease),
              border-color var(--t-mid) var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 107, 74, .6);
}

.card__tag {
  position: absolute;
  top: -12px;
  right: 22px;
  padding: 4px 14px;
  border: 1px solid var(--c-tide);
  border-radius: var(--r-pill);
  background-color: var(--c-sea);
  color: var(--c-mist);
  font-size: 11px;
  letter-spacing: .16em;
}

.card__title { font-size: clamp(19px, 1.6vw, 22px); font-weight: 900; }
.card__meta { font-size: 13px; color: var(--c-mist); }
.card__link { margin-top: auto; font-size: 14px; font-weight: 700; color: var(--c-coral); }
.card__link:hover { color: var(--c-gold); }

.card--jade { border-color: rgba(46, 196, 182, .55); }
.card--jade .card__tag { border-color: rgba(46, 196, 182, .5); color: var(--c-jade); }
.card--jade:hover { border-color: var(--c-jade); }
.card--gold .card__tag { color: var(--c-gold); border-color: rgba(245, 194, 107, .5); }
.card--gold:hover { border-color: rgba(245, 194, 107, .8); }

.card--sm { min-height: 180px; }
.card--md { min-height: 260px; }
.card--tall { min-height: 340px; }

/* ---------- 8. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-tide);
  border-radius: var(--r-lg);
  aspect-ratio: 16 / 9;
  background-color: var(--c-harbor);
  background-image: linear-gradient(158deg, rgba(30, 58, 99, .95) 0%, rgba(11, 30, 58, 1) 62%);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(180deg, rgba(46, 196, 182, .1) 0 1px, transparent 1px 22px);
  opacity: .55;
  pointer-events: none;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame__caption {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 16px;
  z-index: 2;
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(234, 240, 248, .82);
}

/* ---------- 9. 悬浮索引 ---------- */
.index-nav {
  position: sticky;
  top: calc(var(--bar-h) + 24px);
  display: grid;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--c-tide);
  border-radius: var(--r-lg);
  background-color: rgba(18, 41, 74, .55);
}
.index-nav__title {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--c-mist);
}
.index-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--r-pill);
  color: var(--c-mist);
  font-size: 14px;
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.index-nav a:hover { color: var(--c-light); background-color: rgba(30, 58, 99, .6); }
.index-nav a[aria-current] {
  border-left-color: var(--c-coral);
  background-color: rgba(255, 107, 74, .14);
  color: var(--c-light);
}

/* ---------- 10. 滚动显现 ---------- */
html.reveal-armed [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 480ms var(--ease), transform 480ms var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
html.reveal-armed [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 页头 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: calc(var(--rail-w) + 14px);
  z-index: 130;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background-color: var(--c-coral);
  color: var(--c-sea);
  font-weight: 900;
  transform: translateY(-180%);
  transition: transform var(--t-mid) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

.site-header { position: relative; z-index: 100; }

/* 左侧品牌轨道 */
.brand-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 110;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 26px 0 28px;
  border-right: 1px solid var(--c-tide);
  background-color: var(--c-deepest);
}
.brand-rail::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0; right: 0;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(255, 107, 74, .65) 18%, rgba(245, 194, 107, .5) 52%, transparent);
}

.brand-mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.brand-mark__beacon {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--c-coral);
  box-shadow: 0 0 0 6px rgba(255, 107, 74, .14), 0 0 22px 2px rgba(255, 107, 74, .6);
}
.brand-mark__text {
  writing-mode: vertical-rl;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: .18em;
  color: var(--c-light);
}

.rail-note {
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--c-mist);
  max-width: none;
}

.rail-year {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-gold);
}

/* 顶部命令栏 */
.command-bar {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 100;
  height: var(--bar-h);
  border-bottom: 1px solid var(--c-tide);
  background-color: rgba(11, 30, 58, .94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: height var(--t-mid) var(--ease), background-color var(--t-mid) var(--ease);
}
.site-header[data-scrolled="true"] .command-bar {
  height: var(--bar-h-shrink);
  background-color: rgba(6, 19, 42, .96);
}

.command-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 24px);
  width: 100%;
  max-width: var(--shell);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.bar-brand {
  display: none;
  align-items: center;
  gap: 9px;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: .04em;
}
.bar-brand__beacon {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--c-coral);
  box-shadow: 0 0 12px 1px rgba(255, 107, 74, .8);
  flex: none;
}

.command-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.command-nav__item { display: flex; }

.command-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 9px 14px;
  border-radius: var(--r-pill);
  color: var(--c-mist);
  font-size: 14px;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.command-nav__link:hover {
  color: var(--c-light);
  background-color: rgba(30, 58, 99, .7);
}
.command-nav__link[aria-current="page"] {
  color: var(--c-light);
  background-color: rgba(255, 107, 74, .14);
  box-shadow: inset 0 0 0 1px rgba(255, 107, 74, .55);
}
.command-nav__index {
  font-size: 11px;
  color: var(--c-gold);
  opacity: .72;
  transition: color var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.command-nav__link:hover .command-nav__index { opacity: 1; }
.command-nav__link[aria-current="page"] .command-nav__index { color: var(--c-coral); opacity: 1; }

.bar-hint {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-mist);
  white-space: nowrap;
  max-width: none;
}

.search-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 16px;
  border: 1px solid var(--c-tide);
  border-radius: var(--r-pill);
  background-color: rgba(18, 41, 74, .6);
  color: var(--c-mist);
  font-size: 13px;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}
.bar-hint + .search-chip { margin-left: 0; }
.search-chip:hover {
  border-color: var(--c-jade);
  background-color: rgba(46, 196, 182, .12);
  color: var(--c-light);
}
.search-chip__key {
  display: inline-grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background-color: var(--c-tide);
  color: var(--c-gold);
  font-size: 11px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 40px;
  padding: 8px 15px;
  border: 1px solid var(--c-tide);
  border-radius: var(--r-pill);
  color: var(--c-light);
  font-size: 13px;
}
.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: var(--c-coral);
  transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle__label { letter-spacing: .08em; }

.read-progress {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  overflow: hidden;
  background-color: rgba(30, 58, 99, .6);
}
.read-progress__fill {
  display: block;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(90deg, var(--c-gold), var(--c-coral));
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  transition: transform 120ms linear;
}

.nav-scrim { display: none; }

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  border-top: 1px solid var(--c-tide);
  background-color: var(--c-deepest);
  color: var(--c-mist);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(30, 58, 99, .7) 0 1px, transparent 1px 72px);
  opacity: .4;
  pointer-events: none;
}
.site-footer::after {
  content: "";
  position: absolute;
  top: 0; right: 0; left: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 107, 74, .6), rgba(245, 194, 107, .4), transparent);
}

.footer-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(210px, 1.4fr) minmax(150px, .95fr) minmax(160px, .95fr) minmax(210px, 1.2fr);
  grid-template-areas:
    "brand nav cta contact"
    "legal legal legal legal";
  gap: clamp(28px, 3.4vw, 52px) clamp(24px, 3vw, 44px);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 72px) var(--gutter) clamp(24px, 3vw, 34px);
}

.footer-brand { grid-area: brand; }
.footer-brand__mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--c-light);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: .04em;
}
.footer-brand__beacon {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--c-coral);
  box-shadow: 0 0 14px 2px rgba(255, 107, 74, .7);
  flex: none;
}
.footer-brand__note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-mist);
}
.footer-brand__meta {
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-gold);
}

.footer-nav { grid-area: nav; }
.footer-nav__title,
.footer-cta__title {
  margin-bottom: 16px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .24em;
  color: var(--c-mist);
}
.footer-nav__list { display: grid; gap: 10px; }
.footer-nav__list a {
  color: var(--c-light);
  font-size: 15px;
  transition: color var(--t-fast) var(--ease);
}
.footer-nav__list a:hover { color: var(--c-coral); }

.footer-cta { grid-area: cta; }
.footer-cta .btn { width: 100%; }

.footer-contact {
  grid-area: contact;
  display: grid;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid rgba(30, 58, 99, .9);
  font-size: 14px;
  font-style: normal;
  color: var(--c-mist);
}
.footer-contact__line {
  display: grid;
  gap: 2px;
  font-size: 13px;
  letter-spacing: .06em;
}
.footer-contact__value {
  color: var(--c-light);
  font-size: 14px;
  letter-spacing: .01em;
  word-break: break-word;
}

.footer-legal {
  grid-area: legal;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding-top: 24px;
  border-top: 1px solid var(--c-tide);
  font-size: 13px;
}
.footer-legal a { color: var(--c-mist); transition: color var(--t-fast) var(--ease); }
.footer-legal a:hover { color: var(--c-jade); }
.footer-legal__sep { color: var(--c-tide); }
.footer-legal__icp { color: var(--c-mist); opacity: .82; }

/* ---------- 13. 响应式 ---------- */
@media (min-width: 961px) {
  body { padding-left: var(--rail-w); }
  .command-bar { left: var(--rail-w); }
}

@media (max-width: 1280px) {
  .bar-hint { display: none; }
}

@media (max-width: 1080px) {
  .command-nav__link { padding: 8px 10px; font-size: 13px; }
  .command-nav__link .command-nav__index { font-size: 10px; }
  .search-chip { padding: 7px 12px; font-size: 12px; }
}

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--split { grid-template-columns: minmax(0, 1fr); }
  .index-nav { position: static; }

  .footer-shell {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-areas:
      "brand brand"
      "nav cta"
      "contact contact"
      "legal legal";
  }
}

@media (max-width: 960px) {
  :root {
    --bar-h: 60px;
    --bar-h-shrink: 56px;
  }
  .brand-rail { display: none; }
  .bar-brand { display: inline-flex; }
  .nav-toggle { display: inline-flex; }
  .skip-link { left: 14px; }

  .command-bar__inner { gap: 10px; }
  .command-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .command-nav__link {
    justify-content: flex-start;
    padding: 14px 16px;
    border-radius: var(--r-sm);
    font-size: 16px;
  }

  .command-nav {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 105;
    max-height: 100vh;
    padding: calc(var(--bar-h) + 14px) var(--gutter) 26px;
    overflow-y: auto;
    border-bottom: 1px solid var(--c-tide);
    background-color: var(--c-harbor);
    box-shadow: var(--shadow-lift);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-14px);
    transition: opacity var(--t-mid) var(--ease),
                transform var(--t-mid) var(--ease),
                visibility var(--t-mid) var(--ease);
  }
  .site-header[data-scrolled="true"] .command-nav {
    padding-top: calc(var(--bar-h-shrink) + 14px);
  }
  .site-header[data-open="true"] .command-nav,
  .command-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 95;
    background-color: rgba(6, 19, 42, .74);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--t-mid) var(--ease), visibility var(--t-mid) var(--ease);
  }
  .site-header[data-open="true"] .nav-scrim {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .stagger-1, .stagger-2, .stagger-3 { margin-top: 0; }
}

@media (max-width: 640px) {
  .search-chip__text { display: none; }
  .search-chip { padding: 8px 11px; }

  .footer-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "brand"
      "nav"
      "cta"
      "contact"
      "legal";
  }
  .footer-legal { flex-direction: column; align-items: flex-start; gap: 8px; }
  .footer-legal__sep { display: none; }
}

/* ---------- 14. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  html.reveal-armed [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .read-progress__fill { transition: none; }
  .btn:hover { transform: none; }
  .card:hover { transform: none; }
}