/* =========================================================
   大红鹰中文站 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 基础组件
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body { margin: 0; }

h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; 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%; }
table { border-collapse: collapse; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #2A1A12;
  --ink-2: #4B3124;
  --brown: #7C5138;
  --red: #B21F2B;
  --red-bright: #D8453B;
  --gold: #C08A3E;
  --gold-soft: #EADCC0;
  --paper: #F5F1E9;
  --mist: #D9D2C7;
  --mist-deep: #6B665F;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --header-h: 116px;
  --w-max: 1280px;
  --gutter: 24px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --t-fast: 180ms;
  --t-base: 240ms;
}

/* ---------- 3. 中文排版基座 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  font-weight: 400;
  color: var(--ink);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.25rem, 4.4vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); line-height: 1.3; }

p + p { margin-top: 1em; }

strong { font-weight: 700; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* 焦点可见性 */
:focus-visible {
  outline: 2px solid var(--red-bright);
  outline-offset: 3px;
  border-radius: 1px;
}

/* 主内容与固定页头的空间关系 */
main { padding-top: var(--header-h); }
main.bleed-top { padding-top: 0; }

/* 跳至主内容 */
.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 10px 20px;
  background-color: var(--red);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  border-radius: 2px;
  transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 4. 布局容器与分区 ---------- */
.container {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 88px); }
.section--tint { background-color: var(--gold-soft); }
.section--dark { background-color: var(--ink); color: var(--paper); }
.section--line { border-top: 4px solid var(--ink); }
.section--hair { border-top: 1px solid var(--mist); }

.prose { max-width: 36em; }
.lead {
  font-size: 18px;
  line-height: 1.85;
  color: var(--mist-deep);
  max-width: 36em;
}
.section--dark .lead { color: rgba(245, 241, 233, .74); }

/* ---------- 5. 标题组 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--brown);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background-color: var(--gold);
  flex: none;
}
.section--dark .eyebrow { color: var(--gold-soft); }

.display-title {
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.section-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(24px, 4vw, 44px);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.01em;
  transition: background-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background-color: var(--red); color: #fff; }
.btn--primary:hover { background-color: var(--red-bright); }
.btn--ghost { border-color: var(--brown); color: var(--ink); }
.btn--ghost:hover { border-color: var(--red-bright); color: var(--red); }
.btn--gold { background-color: var(--gold); color: var(--ink); }
.btn--gold:hover { background-color: var(--gold-soft); }

/* ---------- 7. 面层：实色卡片与玻璃层 ---------- */
.card {
  display: block;
  padding: 24px;
  background-color: var(--paper);
  border: 1px solid var(--mist);
  border-left: 4px solid var(--ink-2);
  border-radius: 2px;
  transition: transform var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}
.card:hover,
.card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--red-bright);
  border-left-color: var(--red);
}
.section--tint .card { background-color: #fff; }

.glass-panel {
  background-color: rgba(42, 26, 18, .58);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
  border: 1px solid rgba(234, 220, 192, .30);
  border-radius: 2px;
  color: var(--paper);
}

/* ---------- 8. 标签 / 面包屑 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--brown);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--brown);
}
.tag--red { border-color: var(--red); color: var(--red); }

.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-deep);
}
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--brown);
}
.breadcrumbs a:hover { color: var(--red); border-bottom: 1px solid var(--red-bright); }

/* ---------- 9. 网格 ---------- */
.grid { display: grid; gap: var(--gutter); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }

/* ---------- 10. 表格 ---------- */
.data-table-scroll {
  overflow-x: auto;
  border: 1px solid var(--mist);
  background-color: var(--paper);
}
.data-table {
  width: 100%;
  min-width: 620px;
  font-size: 15px;
  line-height: 1.75;
}
.data-table caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist-deep);
}
.data-table th,
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--mist);
  text-align: left;
  vertical-align: top;
}
.data-table thead th {
  position: sticky;
  top: 0;
  background-color: var(--ink-2);
  color: var(--gold-soft);
  font-weight: 700;
  z-index: 1;
}
.data-table tbody tr:nth-child(even) { background-color: rgba(217, 210, 199, .30); }
.data-table .is-sticky-col {
  position: sticky;
  left: 0;
  background-color: var(--gold-soft);
  font-weight: 700;
  z-index: 2;
}

/* ---------- 11. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--mist);
  border-radius: 2px;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 72% 26%, rgba(192, 138, 62, .38), transparent 56%),
    repeating-radial-gradient(circle at 18% 82%, rgba(234, 220, 192, .12) 0 1px, transparent 1px 15px),
    linear-gradient(135deg, var(--ink) 0%, var(--ink-2) 55%, var(--brown) 100%);
}
.media-frame > img,
.media-frame > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 12. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  color: var(--paper);
  background-color: rgba(42, 26, 18, .82);
  background-image: linear-gradient(180deg, rgba(42, 26, 18, .94) 0%, rgba(42, 26, 18, .58) 100%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
  box-shadow: 0 1px 0 rgba(192, 138, 62, .30);
  transition: background-color var(--t-base) var(--ease),
              box-shadow var(--t-base) var(--ease);
}
.site-header.is-solid {
  background-color: var(--ink);
  background-image: none;
  box-shadow: 0 2px 0 var(--gold);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-image: linear-gradient(90deg, var(--red) 0%, var(--red-bright) 45%, var(--gold) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 120ms linear;
  opacity: 0;
  pointer-events: none;
}
.site-header.is-solid .scroll-progress { opacity: 1; }

.header-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: var(--w-max);
  height: 72px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}
.brand-mark {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background-image: radial-gradient(circle at 50% 50%,
    #F5F1E9 0 13%,
    var(--gold) 14% 29%,
    var(--red) 30% 51%,
    var(--ink) 52% 100%);
  box-shadow: inset 0 0 0 1px rgba(234, 220, 192, .38);
  transition: transform var(--t-base) var(--ease);
}
.brand:hover .brand-mark { transform: rotate(-6deg); }
.brand-mark--lg { width: 40px; height: 40px; }

.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--gold-soft);
  opacity: .72;
}

/* 主导航 */
.primary-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 12px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  color: rgba(245, 241, 233, .82);
  transition: color var(--t-fast) var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 3px;
  background-color: var(--red-bright);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.nav-link:hover { color: #fff; }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: #fff; font-weight: 700; }
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background-color: var(--gold);
}

/* 页头 CTA */
.header-cta {
  flex: none;
  padding: 8px 18px;
  border: 1px solid rgba(192, 138, 62, .62);
  border-radius: 2px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--gold-soft);
  transition: background-color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease);
}
.header-cta:hover {
  background-color: var(--red);
  border-color: var(--red);
  color: #fff;
}

/* 移动抽屉按钮 */
.nav-toggle {
  display: none;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: none;
  border: 1px solid rgba(192, 138, 62, .55);
  border-radius: 2px;
  background-color: rgba(0, 0, 0, .18);
  color: var(--paper);
  transition: border-color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); background-color: rgba(0, 0, 0, .34); }
.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: background-color var(--t-fast) var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--t-base) var(--ease);
}
.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

/* 常用入口窄带 */
.entry-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 44px;
  padding-inline: max(var(--gutter), calc((100% - var(--w-max)) / 2 + var(--gutter)));
  background-color: rgba(0, 0, 0, .22);
  border-top: 1px solid rgba(234, 220, 192, .14);
  font-size: 13px;
  line-height: 1.5;
}
.entry-bar-label {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.entry-list {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.entry-list::-webkit-scrollbar { display: none; }
.entry-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 5px 12px;
  border-radius: 2px;
  white-space: nowrap;
  color: rgba(245, 241, 233, .86);
  transition: background-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.entry-link:hover,
.entry-link:focus-visible {
  background-color: rgba(234, 220, 192, .16);
  color: #fff;
}
.entry-idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--gold);
}
.entry-note {
  margin-left: auto;
  flex: none;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(245, 241, 233, .48);
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--ink);
  color: var(--paper);
  padding-top: 8px;
}
.footer-ridge {
  position: absolute;
  inset: 0 0 auto 0;
  height: 8px;
  background-color: var(--red);
  background-image: repeating-linear-gradient(90deg, var(--gold) 0 3px, transparent 3px 22px);
  opacity: .92;
}
.footer-inner {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 64px) var(--gutter) clamp(32px, 4vw, 48px);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.25fr;
  gap: clamp(28px, 4vw, 56px);
}
.footer-col { min-width: 0; }
.footer-col--brand { display: block; }

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.footer-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.01em;
  line-height: 1.2;
}
.footer-tagline {
  margin-top: 16px;
  max-width: 24em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 233, .76);
}
.footer-region {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(245, 241, 233, .56);
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.5;
  color: var(--gold-soft);
}
.footer-heading::before {
  content: "";
  width: 18px;
  height: 2px;
  background-color: var(--gold);
  flex: none;
}

.footer-links { display: grid; gap: 2px; }
.footer-links a {
  display: inline-block;
  padding: 5px 0;
  font-size: 15px;
  line-height: 1.6;
  color: rgba(245, 241, 233, .82);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.footer-links a:hover,
.footer-links a:focus-visible {
  color: #fff;
  border-bottom-color: var(--red-bright);
}

.footer-contact { display: grid; }
.footer-contact-item {
  padding: 10px 0;
  border-bottom: 1px solid rgba(245, 241, 233, .12);
}
.footer-contact-item:first-child { padding-top: 0; }
.footer-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.14em;
  line-height: 1.6;
  color: rgba(234, 220, 192, .68);
}
.footer-contact-value {
  display: block;
  margin-top: 2px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--paper);
  overflow-wrap: anywhere;
}
a.footer-contact-value:hover { color: var(--gold-soft); }

.copy-btn {
  display: inline-block;
  margin-top: 6px;
  padding: 3px 10px;
  border: 1px solid rgba(192, 138, 62, .55);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: rgba(234, 220, 192, .86);
  transition: background-color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease);
}
.copy-btn:hover { background-color: rgba(234, 220, 192, .14); color: #fff; }
.copy-btn[data-copied="true"] {
  background-color: var(--red);
  border-color: var(--red);
  color: #fff;
}

.footer-legal {
  border-top: 1px solid rgba(234, 220, 192, .16);
  background-color: rgba(0, 0, 0, .22);
}
.footer-legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding: 18px var(--gutter) 24px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 241, 233, .60);
}
.footer-copy { margin: 0; }
.footer-year { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.footer-meta-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-meta-links a {
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.footer-meta-links a:hover,
.footer-meta-links a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
}
.footer-icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 14. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 480ms var(--ease), transform 480ms var(--ease);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 15. 响应式：平板 ---------- */
@media (max-width: 1180px) {
  :root { --gutter: 22px; }
  .nav-link { padding: 10px 9px; font-size: 14px; }
  .nav-link::after { left: 9px; right: 9px; }
  .footer-grid { grid-template-columns: 1.2fr 1fr 1.2fr; }
}

/* ---------- 16. 响应式：移动与抽屉 ---------- */
@media (max-width: 900px) {
  :root { --header-h: 104px; --gutter: 20px; }

  .header-inner {
    height: 60px;
    justify-content: space-between;
    gap: 12px;
  }
  .brand-name { font-size: 16px; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-grid; }
  .entry-note { display: none; }
  .entry-bar { gap: 10px; font-size: 12px; }
  .entry-link { padding: 5px 9px; }

  .primary-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 91;
    display: block;
    margin-left: 0;
    padding: 8px var(--gutter) 24px;
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    background-color: var(--ink);
    border-top: 1px solid rgba(192, 138, 62, .40);
    box-shadow: 0 2px 0 var(--gold);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity var(--t-base) var(--ease),
                transform var(--t-base) var(--ease),
                visibility var(--t-base) var(--ease);
  }
  .primary-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    display: block;
    padding: 14px 4px;
    font-size: 17px;
    border-bottom: 1px solid rgba(234, 220, 192, .12);
  }
  .nav-link::after {
    left: 4px;
    right: auto;
    width: 24px;
    bottom: 9px;
    height: 3px;
  }
  body.nav-open { overflow: hidden; }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col--brand { grid-column: 1 / -1; }
  .footer-legal-inner { justify-content: flex-start; }

  .grid-2, .grid-3, .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-7, .span-8 { grid-column: span 2; }
  .media-frame--wide { aspect-ratio: 16 / 10; }
}

/* ---------- 17. 响应式：窄屏 ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .brand-mark { width: 30px; height: 30px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-col--brand { grid-column: auto; }
  .entry-bar-label { display: none; }
  .footer-legal-inner { gap: 10px 18px; font-size: 12px; }

  .grid-2, .grid-3, .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .span-3, .span-4, .span-5, .span-7, .span-8 { grid-column: span 1; }
}

/* ---------- 18. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .brand:hover .brand-mark,
  .btn:hover,
  .card:hover,
  .card:focus-visible {
    transform: none;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}