/* ============================================================
   乐鱼体育 · /assets/site.css
   共享外壳：reset、变量、中文排版、头部、页脚、通用组件
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: clamp(110px, 16vh, 170px);
}

body, h1, h2, h3, h4, p, figure, blockquote, ul, ol { margin: 0; }
ul, ol { padding: 0; }
img, svg { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }
a { color: inherit; }

/* ---------- 2. 变量 ---------- */
:root {
  --night: #061428;
  --night-deep: #040E1C;
  --panel: #0E2A4F;
  --panel-2: #123563;
  --violet: #3A2266;
  --orange: #FF6A1A;
  --orange-soft: #FFB26B;
  --mint: #22E6A8;
  --wine: #8C2F4A;
  --teal-deep: #0B3C3C;
  --text: #F2F6FF;
  --muted: #A9BBD6;
  --ink: #061428;

  --line: rgba(242, 246, 255, 0.18);
  --line-strong: rgba(242, 246, 255, 0.42);

  --shadow-hard: 8px 8px 0 rgba(2, 8, 18, 0.72);
  --shadow-lift: 10px 10px 0 rgba(2, 8, 18, 0.88);

  --font-display: "Archivo Black", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-editorial: "Noto Serif SC", "Songti SC", "Source Han Serif SC", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --dur: 0.26s;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --wrap: 1240px;
}

/* ---------- 3. 中文排版与基础 ---------- */
body {
  background: var(--night);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.005em;
  text-wrap: balance;
}

h1 { font-size: clamp(32px, 5vw, 56px); }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 { font-size: clamp(20px, 2vw, 28px); }
h4 { font-size: 20px; }

p { max-width: 68ch; }
strong { color: var(--orange-soft); font-weight: 700; }

::selection { background: var(--orange); color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
  border-radius: 2px;
}

.mono { font-family: var(--font-mono); letter-spacing: 0.04em; }
.muted { color: var(--muted); }

/* ---------- 4. 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--7-5 { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.grid--8-4 { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  transform: translateY(-180%);
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 10px 18px;
  border: 3px solid var(--ink);
  text-decoration: none;
  transition: transform 0.18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(180deg, #07182F 0%, #061428 100%);
  border-bottom: 3px solid var(--orange);
  box-shadow: 0 6px 0 rgba(2, 8, 18, 0.55);
  isolation: isolate;
}

.header-ticker {
  height: 5px;
  background-image:
    repeating-linear-gradient(90deg, var(--orange) 0 14px, rgba(255, 106, 26, 0) 14px 30px),
    linear-gradient(90deg, var(--wine), var(--violet) 45%, var(--teal-deep));
  background-blend-mode: normal;
}

.header-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
  padding-block: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas: "brand nav";
  align-items: center;
  gap: clamp(16px, 3vw, 48px);
  min-height: 98px;
}

.brand-mark {
  grid-area: brand;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 0 12px 14px;
  border-left: 4px solid var(--mint);
  text-decoration: none;
  color: var(--text);
  transition: transform var(--dur) var(--ease);
}
.brand-mark:hover { transform: translateY(-2px); }

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.05;
  letter-spacing: 0.02em;
}
.brand-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
  white-space: nowrap;
}

/* 移动端抽屉按钮 */
.nav-toggle {
  display: none;
  grid-area: toggle;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: var(--panel);
  color: var(--text);
  border: 3px solid var(--line-strong);
  border-radius: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: 4px 4px 0 rgba(2, 8, 18, 0.7);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--orange); transform: translateY(-2px); }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 18px;
}
.nav-toggle-bars i {
  display: block;
  height: 3px;
  width: 100%;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle-text { line-height: 1; }

/* 导航 */
.site-nav {
  grid-area: nav;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
  min-width: 0;
}

.nav-tier { min-width: 0; }

.nav-tier--upper {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--line);
}

.nav-drawer-note { display: none; }

.nav-list { list-style: none; display: flex; align-items: center; }

.nav-list--upper { gap: 18px; flex-wrap: wrap; }

.nav-link {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-decoration: none;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--text); border-bottom-color: var(--orange); }
.nav-link[aria-current="page"] { color: var(--mint); border-bottom-color: var(--mint); }

.nav-quick {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  white-space: nowrap;
  text-decoration: none;
  color: var(--ink);
  background: var(--mint);
  border: 2px solid var(--ink);
  padding: 6px 12px;
  box-shadow: 3px 3px 0 rgba(2, 8, 18, 0.8);
  transition: background-color var(--dur) var(--ease), transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-quick:hover,
.nav-quick:focus-visible {
  background: var(--orange);
  transform: translate(-1px, -1px);
  box-shadow: 5px 5px 0 rgba(2, 8, 18, 0.9);
}

.nav-tier--lower { padding-top: 9px; }
.nav-list--lower { gap: 10px; flex-wrap: wrap; }

.nav-link--main {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--text);
  text-decoration: none;
  padding: 8px 15px;
  background: transparent;
  border: 3px solid transparent;
  border-left: 3px solid var(--line-strong);
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.nav-link--main:hover,
.nav-link--main:focus-visible {
  background: var(--panel);
  border-color: var(--line-strong);
  border-left-color: var(--orange);
  color: var(--orange-soft);
  transform: translateY(-2px);
}
.nav-link--main[aria-current="page"] {
  background: var(--orange);
  color: var(--ink);
  border-color: var(--orange);
  border-left-color: var(--mint);
}

/* 阅读进度尺 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 3px;
  background: rgba(255, 106, 26, 0.18);
  pointer-events: none;
  overflow: hidden;
}
.scroll-meter-fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--mint);
  transition: width 0.12s linear;
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 9vw, 110px);
  background: linear-gradient(180deg, #071A33 0%, #040E1C 55%, #061428 100%);
  border-top: 3px solid var(--orange);
  color: var(--text);
}

.footer-stripe {
  height: 10px;
  background: linear-gradient(90deg,
    var(--wine) 0 25%,
    var(--violet) 25% 50%,
    var(--teal-deep) 50% 75%,
    var(--panel-2) 75% 100%);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(32px, 5vw, 58px);
}

.footer-brand {
  border-left: 4px solid var(--mint);
  padding-left: clamp(14px, 2vw, 20px);
}

.footer-brand-mark {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 2.4vw, 30px);
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.footer-brand-mark:hover,
.footer-brand-mark:focus-visible { color: var(--orange-soft); transform: translateY(-2px); }

.footer-brand-summary {
  margin-top: 12px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
  max-width: 42ch;
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 34px);
}

.footer-col-title {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange-soft);
  margin: 0 0 14px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line-strong);
}

.footer-list { list-style: none; display: grid; gap: 9px; }

.footer-link {
  display: inline-block;
  font-size: 15px;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--orange-soft);
  border-bottom-color: var(--orange);
  transform: translateY(-1px);
}

.footer-contact {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: 12px clamp(16px, 3vw, 40px);
  align-items: start;
  padding-block: clamp(20px, 3vw, 30px);
  border-top: 3px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.footer-contact-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--mint);
  margin: 0;
}

.footer-contact-body { display: grid; gap: 6px; max-width: 78ch; }

.footer-contact-line {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--text);
  letter-spacing: 0.02em;
  word-break: break-word;
}

.footer-contact-note {
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 18px 26px;
}

.footer-copy,
.footer-icp {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0;
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.04em;
  padding: 12px 22px;
  background: var(--orange);
  color: var(--ink);
  border: 3px solid var(--orange);
  border-radius: 0;
  text-decoration: none;
  box-shadow: 6px 6px 0 rgba(2, 8, 18, 0.8);
  cursor: pointer;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn:hover,
.btn:focus-visible {
  background: var(--orange-soft);
  border-color: var(--orange-soft);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(2, 8, 18, 0.9);
}
.btn:active { transform: translate(2px, 2px); box-shadow: 3px 3px 0 rgba(2, 8, 18, 0.9); }

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--line-strong);
  box-shadow: 6px 6px 0 rgba(2, 8, 18, 0.55);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(34, 230, 168, 0.08);
  border-color: var(--mint);
  color: var(--mint);
  box-shadow: 8px 8px 0 rgba(2, 8, 18, 0.7);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  margin-block: 18px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}
.breadcrumbs li { display: flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before { content: "/"; color: var(--line-strong); }
.breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumbs a:hover,
.breadcrumbs a:focus-visible { color: var(--orange-soft); border-bottom-color: var(--orange); }
.breadcrumbs [aria-current="page"] { color: var(--text); }

/* ---------- 10. 面板 / 色带 / 章节头 ---------- */
.panel {
  background: var(--panel);
  border: 3px solid var(--line-strong);
  padding: clamp(18px, 2.4vw, 28px);
  box-shadow: var(--shadow-hard);
}
.panel--flat {
  box-shadow: none;
  border-color: var(--line);
  background: rgba(14, 42, 79, 0.55);
}

.band {
  padding-block: clamp(32px, 5vw, 64px);
  border-block: 3px solid rgba(2, 8, 18, 0.6);
}
.band--wine { background: linear-gradient(120deg, var(--wine) 0%, #5C1D31 100%); }
.band--teal { background: linear-gradient(120deg, var(--teal-deep) 0%, #072A2A 100%); }
.band--violet { background: linear-gradient(120deg, var(--violet) 0%, #1D1140 100%); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mint);
  margin: 0 0 12px;
}
.eyebrow::before {
  content: "";
  display: block;
  width: 22px;
  height: 3px;
  background: var(--orange);
}

.section-head { margin-bottom: clamp(20px, 3vw, 34px); }
.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 40px);
  line-height: 1.14;
  margin: 0;
}
.section-note {
  margin-top: 12px;
  color: var(--muted);
  font-size: 16px;
  max-width: 62ch;
}

/* ---------- 11. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 4px 10px;
  border: 2px solid var(--line-strong);
  color: var(--muted);
  background: rgba(6, 20, 40, 0.55);
  text-decoration: none;
  white-space: nowrap;
}
.tag--mint { border-color: var(--mint); color: var(--mint); }
.tag--orange { border-color: var(--orange); color: var(--orange-soft); }

/* ---------- 12. 数据表 ---------- */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 3px solid var(--line-strong);
  box-shadow: var(--shadow-hard);
  background: rgba(14, 42, 79, 0.45);
}
.data-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 14px;
}
.data-table th,
.data-table td {
  border-bottom: 1px solid var(--line);
  padding: 11px 14px;
  text-align: left;
  white-space: nowrap;
}
.data-table thead th {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange-soft);
  border-bottom: 3px solid var(--line-strong);
  background: rgba(6, 20, 40, 0.6);
}
.data-table tbody tr { transition: background-color var(--dur) var(--ease); }
.data-table tbody tr:hover { background: rgba(34, 230, 168, 0.07); }

/* ---------- 13. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  margin: 0;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 3px solid var(--line-strong);
  background: linear-gradient(155deg, var(--panel) 0%, var(--violet) 100%);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame::before,
.media-frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 3px solid var(--orange);
  z-index: 2;
  pointer-events: none;
}
.media-frame::before { top: 8px; left: 8px; border-right: 0; border-bottom: 0; }
.media-frame::after { bottom: 8px; right: 8px; border-left: 0; border-top: 0; }

.media-frame figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  padding: 26px 14px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text);
  background: linear-gradient(180deg, rgba(4, 14, 28, 0) 0%, rgba(4, 14, 28, 0.92) 100%);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 14. 显现（由 site.js 控制） ---------- */
[data-reveal].reveal-armed {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-list--upper { gap: 14px; }
  .nav-link--main { font-size: 14px; padding: 7px 12px; }
  .header-inner { min-height: 88px; gap: 20px; }
}

@media (max-width: 960px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-columns { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-contact { grid-template-columns: minmax(0, 1fr); }
}

/* 移动端：上层收进品牌抽屉，下层保留横向可滑栏目条 */
@media (max-width: 920px) {
  html { scroll-padding-top: 130px; }

  .header-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand toggle"
      "nav nav";
    align-items: center;
    gap: 8px 12px;
    padding-block: 10px 6px;
    min-height: 0;
  }

  .brand-mark { padding: 4px 0 4px 12px; }
  .brand-note { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav { width: 100%; padding-bottom: 2px; }

  .nav-tier--upper {
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 10px;
    padding: 14px 0 16px;
    border-bottom: 3px solid var(--line);
  }
  .site-header[data-open] .nav-tier--upper { display: flex; }

  .nav-drawer-note {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--muted);
  }

  .nav-list--upper {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }
  .nav-list--upper .nav-link {
    display: block;
    width: 100%;
    padding: 10px 0;
    font-size: 14px;
    letter-spacing: 0.1em;
    border-bottom: 1px solid var(--line);
  }
  .nav-list--upper .nav-link[aria-current="page"] { border-bottom-color: var(--mint); }

  .nav-quick { align-self: flex-start; margin-top: 4px; }

  .nav-tier--lower {
    padding: 6px 0 2px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }
  .nav-list--lower {
    flex-wrap: nowrap;
    gap: 8px;
    padding-bottom: 4px;
  }
  .nav-link--main { white-space: nowrap; font-size: 14px; padding: 7px 13px; }

  .site-header[data-open] .nav-toggle {
    background: var(--orange);
    border-color: var(--orange);
    color: var(--ink);
  }
  .site-header[data-open] .nav-toggle-bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .site-header[data-open] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
  .site-header[data-open] .nav-toggle-bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

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

  body { font-size: 16px; }
}

@media (max-width: 720px) {
  .footer-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 18px; }
  .footer-base { justify-content: flex-start; }
  .footer-brand-summary { font-size: 14px; }
  .media-frame { aspect-ratio: 4 / 3; }
  .media-frame--wide { aspect-ratio: 16 / 9; }
  .media-frame--tall { aspect-ratio: 3 / 4; }
}

@media (max-width: 480px) {
  .footer-columns { grid-template-columns: minmax(0, 1fr); }
  .nav-link--main { font-size: 13px; padding: 6px 10px; }
  .brand-name { font-size: 21px; }
  .btn { width: 100%; justify-content: center; }
}

/* ---------- 16. 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;
  }
  [data-reveal].reveal-armed { opacity: 1; transform: none; }
  .media-frame img { transition: none; }
}