/* ============================================================
   赛事通体育 · 共享站点样式 /assets/site.css
   深空黑基底 + 珠宝色分区 + 霓虹青索引
   ============================================================ */

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

html,
body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, dl, dd, dt,
figure, blockquote { 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 { display: block; max-width: 100%; }

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #05070E;
  --ink-deep: #0B1024;
  --teal-deep: #062A2E;
  --wine: #3B0C22;
  --indigo: #221A47;

  --cyan: #3FF0D8;
  --red: #FF2E4D;
  --orange: #FF8A2B;

  --white: #EAF6FF;
  --mist: #8FA3B8;

  --glass: rgba(255, 255, 255, 0.06);
  --glass-strong: rgba(255, 255, 255, 0.11);
  --line: rgba(234, 246, 255, 0.14);
  --line-cyan: rgba(63, 240, 216, 0.34);
  --line-red: rgba(255, 46, 77, 0.36);

  --shadow-hard: 7px 7px 0 rgba(0, 0, 0, 0.58);
  --shadow-glow: 0 22px 60px -32px rgba(63, 240, 216, 0.55);

  --maxw: 1360px;
  --gutter: 28px;

  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Cascadia Mono", "Roboto Mono", Consolas,
    "Liberation Mono", Menlo, monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --tap: 180ms;
  --move: 300ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.18;
}

p { color: var(--white); }

strong { font-weight: 800; }

em { font-style: normal; }

::selection {
  background: rgba(63, 240, 216, 0.28);
  color: var(--white);
}

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

/* ---------- 4. 通用工具 ---------- */
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.section-title {
  font-weight: 200;
  font-size: clamp(34px, 5.2vw, 74px);
  line-height: 0.98;
  letter-spacing: -0.015em;
  color: var(--white);
}

.section-note {
  font-size: 15px;
  color: var(--mist);
  max-width: 62ch;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
  background: rgba(63, 240, 216, 0.07);
  border-radius: 2px;
}

.divider {
  height: 1px;
  border: 0;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(63, 240, 216, 0.5) 0 1px,
    transparent 1px 22px
  );
}

.stack { display: flex; flex-direction: column; gap: 20px; }
.stack--tight { gap: 10px; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--line-cyan);
  background: var(--glass);
  color: var(--white);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: 2px;
  transition: transform var(--tap) var(--ease), background var(--tap) var(--ease),
    color var(--tap) var(--ease), border-color var(--tap) var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
  background: var(--glass-strong);
  border-color: var(--cyan);
}

.btn--primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #03110F;
  box-shadow: var(--shadow-hard);
}

.btn--primary:hover {
  background: #74F7E7;
  color: #03110F;
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--mist);
}

.btn--ghost:hover {
  color: var(--white);
  border-color: var(--line-cyan);
}

.btn--danger {
  border-color: var(--line-red);
  color: #FFD9DF;
  background: rgba(255, 46, 77, 0.08);
}

.btn--danger:hover {
  border-color: var(--red);
  background: rgba(255, 46, 77, 0.16);
}

/* ---------- 6. Skip link ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -90px;
  z-index: 300;
  padding: 11px 20px;
  background: var(--cyan);
  color: #03110F;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.06em;
  border-radius: 2px;
  transition: top var(--tap) var(--ease);
}

.skip-link:focus {
  top: 14px;
}

/* ---------- 7. 头部 ---------- */
.site-header {
  position: relative;
  z-index: 80;
  background: var(--ink);
}

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 200;
  pointer-events: none;
  background: rgba(255, 255, 255, 0.05);
}

.scroll-progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 62%, var(--red));
}

/* 品牌带 */
.brand-strip {
  background:
    linear-gradient(90deg, rgba(6, 42, 46, 0.95) 0%, rgba(5, 7, 14, 0.98) 52%, rgba(34, 26, 71, 0.92) 100%);
  border-bottom: 1px solid rgba(63, 240, 216, 0.18);
}

.brand-strip__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px var(--gutter);
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand-mark__abbr {
  display: inline-block;
  padding: 6px 10px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: #03110F;
  background: var(--cyan);
  border-radius: 2px;
  box-shadow: 3px 3px 0 rgba(255, 46, 77, 0.85);
}

.brand-mark__name {
  display: flex;
  flex-direction: column;
  line-height: 1.24;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--white);
}

.brand-mark__name em {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.brand-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.meta-chip {
  padding: 5px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: 2px;
  white-space: nowrap;
}

.meta-chip--region {
  color: var(--cyan);
  border-color: rgba(63, 240, 216, 0.42);
  background: rgba(63, 240, 216, 0.06);
}

.meta-chip--count .num {
  color: var(--orange);
  font-weight: 700;
}

.brand-strip__cta {
  margin-left: auto;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  white-space: nowrap;
  color: var(--cyan);
  border: 1px solid rgba(63, 240, 216, 0.46);
  background: rgba(63, 240, 216, 0.07);
  border-radius: 2px;
  transition: background var(--tap) var(--ease), color var(--tap) var(--ease),
    border-color var(--tap) var(--ease), transform var(--tap) var(--ease);
}

.brand-strip__cta:hover {
  background: var(--cyan);
  color: #03110F;
  border-color: var(--cyan);
  transform: translateY(-1px);
}

/* 栏目带 */
.nav-band {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(5, 7, 14, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: background var(--move) var(--ease), border-color var(--move) var(--ease);
}

.nav-band__inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-header.is-condensed .nav-band {
  background: rgba(5, 7, 14, 0.99);
  border-bottom-color: rgba(63, 240, 216, 0.3);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  flex: 1 1 auto;
  min-width: 0;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 18px 2px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
  white-space: nowrap;
  transition: color var(--tap) var(--ease), padding var(--move) var(--ease);
}

.site-header.is-condensed .nav-link {
  padding: 11px 2px;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 10px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--tap) var(--ease), bottom var(--move) var(--ease);
}

.site-header.is-condensed .nav-link::after { bottom: 4px; }

.nav-link:hover { color: var(--cyan); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.nav-link[aria-current="page"] .nav-link__index { color: var(--orange); }

.nav-utility {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 6px;
  flex: 0 0 auto;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  color: var(--mist);
  border: 1px solid var(--line);
  background: var(--glass);
  border-radius: 2px;
  transition: color var(--tap) var(--ease), border-color var(--tap) var(--ease),
    background var(--tap) var(--ease);
}

.icon-btn:hover {
  color: var(--cyan);
  border-color: var(--line-cyan);
  background: rgba(63, 240, 216, 0.09);
}

.icon-shape {
  position: relative;
  display: block;
  width: 18px;
  height: 18px;
}

.icon-btn--mail .icon-shape::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 2px;
  bottom: 2px;
  border: 1.5px solid currentColor;
  border-radius: 2px;
}

.icon-btn--mail .icon-shape::after {
  content: "";
  position: absolute;
  left: 1px;
  right: 1px;
  top: 4px;
  height: 9px;
  background: currentColor;
  clip-path: polygon(0 0, 50% 68%, 100% 0, 100% 16%, 50% 84%, 0 16%);
}

.icon-btn--search .icon-shape::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 0;
  width: 11px;
  height: 11px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
}

.icon-btn--search .icon-shape::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 11px;
  width: 7px;
  height: 1.5px;
  background: currentColor;
  transform: rotate(45deg);
  transform-origin: left center;
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--white);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  transition: border-color var(--tap) var(--ease), color var(--tap) var(--ease);
}

.nav-toggle:hover { border-color: var(--line-cyan); color: var(--cyan); }

.nav-toggle__icon {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
  flex: 0 0 auto;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cyan);
  transition: transform var(--tap) var(--ease);
}

.nav-toggle__icon::before { top: 0; }
.nav-toggle__icon::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 132px);
  background: linear-gradient(180deg, rgba(6, 42, 46, 0.96) 0%, rgba(5, 7, 14, 0.99) 78%);
  border-top: 1px solid var(--line-cyan);
  color: var(--white);
}

.footer-ticks {
  height: 10px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(63, 240, 216, 0.5) 0 1px,
    transparent 1px 26px
  );
  border-bottom: 1px solid rgba(63, 240, 216, 0.16);
}

.footer-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(34px, 5vw, 58px) var(--gutter) clamp(24px, 3vw, 34px);
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: 30px 34px;
}

.footer-col { min-width: 0; }

.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
  border-bottom: 1px solid rgba(63, 240, 216, 0.22);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-list a {
  display: inline-block;
  font-size: 14.5px;
  color: var(--mist);
  transition: color var(--tap) var(--ease), transform var(--tap) var(--ease);
}

.footer-list a:hover {
  color: var(--cyan);
  transform: translateX(4px);
}

.footer-note {
  margin-top: 14px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
  max-width: 34ch;
}

.footer-coord {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: rgba(143, 163, 184, 0.8);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px 18px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-left: 2px solid var(--red);
  border-radius: 2px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.contact-item__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.contact-item__val {
  font-size: 14px;
  line-height: 1.55;
  color: var(--white);
  word-break: break-word;
}

.footer-legal {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--gutter) 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  border-top: 1px solid var(--line);
}

.footer-legal__text,
.footer-legal__icp {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.footer-legal__icp { margin-left: auto; }

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.legal-links a {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color var(--tap) var(--ease), border-color var(--tap) var(--ease);
}

.legal-links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 9. 页面壳与分区 ---------- */
.page-shell {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-shell--narrow { max-width: 960px; }

.section {
  position: relative;
  padding: clamp(46px, 7vw, 96px) 0;
}

.section--teal { background: var(--teal-deep); }
.section--wine { background: var(--wine); }
.section--indigo { background: var(--indigo); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.breadcrumb a {
  color: var(--mist);
  transition: color var(--tap) var(--ease);
}

.breadcrumb a:hover { color: var(--cyan); }

.breadcrumb__sep { color: rgba(143, 163, 184, 0.45); }

/* ---------- 10. 网格工具 ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

.col-main { grid-column: span 7; }
.col-side { grid-column: span 4; }
.col-rail { grid-column: span 1; }

/* ---------- 11. 面板与容器 ---------- */
.glass-panel {
  position: relative;
  padding: 24px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 3px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 24px 62px -36px rgba(0, 0, 0, 0.95);
}

.framed {
  position: relative;
}

.framed::before,
.framed::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cyan);
  pointer-events: none;
}

.framed::before {
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
}

.framed::after {
  right: -2px;
  bottom: -2px;
  border-left: 0;
  border-top: 0;
}

.data-panel {
  position: relative;
  padding: 18px 20px 20px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 2px;
  box-shadow: 0 20px 48px -32px rgba(63, 240, 216, 0.6);
}

.data-panel__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--cyan);
}

.data-panel__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

/* ---------- 12. 图片容器（供页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line-cyan);
  border-radius: 2px;
  background: linear-gradient(135deg, var(--teal-deep) 0%, var(--indigo) 58%, var(--wine) 100%);
}

.media-frame > img,
.media-frame > svg,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(5, 7, 14, 0) 55%, rgba(5, 7, 14, 0.7) 100%),
    repeating-linear-gradient(90deg, rgba(63, 240, 216, 0.16) 0 1px, transparent 1px 60px);
}

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

/* ---------- 13. 坐标索引 ---------- */
.coord-index {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.coord-index__item {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 11px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--glass);
  transition: color var(--tap) var(--ease), border-color var(--tap) var(--ease),
    background var(--tap) var(--ease);
}

.coord-index__item:hover {
  color: var(--white);
  border-color: var(--line-cyan);
}

.coord-index__item[aria-current="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(63, 240, 216, 0.12);
}

/* ---------- 14. 主题筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.facet-btn {
  padding: 9px 15px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: color var(--tap) var(--ease), border-color var(--tap) var(--ease),
    background var(--tap) var(--ease), transform var(--tap) var(--ease);
}

.facet-btn:hover {
  color: var(--white);
  border-color: var(--line-cyan);
  transform: translateY(-1px);
}

.facet-btn[aria-pressed="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(63, 240, 216, 0.14);
}

/* ---------- 15. 地图图例 ---------- */
.map-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.map-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.map-legend__dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 1px;
}

.map-legend__dot--domestic { background: var(--cyan); }
.map-legend__dot--overseas { background: var(--orange); }
.map-legend__dot--focus { background: var(--red); }

/* ---------- 16. 显现动画 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translate3d(-14px, 18px, 0);
  transition: opacity var(--move) var(--ease), transform var(--move) var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1.2fr; }
  .footer-grid > .footer-col:nth-child(3) { grid-column: 1 / 2; }
}

@media (max-width: 900px) {
  :root { --gutter: 20px; }

  body { font-size: 16px; }

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

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px 12px;
    max-height: 0;
    padding: 0 18px;
    opacity: 0;
    visibility: hidden;
    overflow: hidden;
    background: var(--ink-deep);
    border-bottom: 1px solid rgba(63, 240, 216, 0.24);
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.95);
    transition: max-height var(--move) var(--ease), opacity var(--tap) var(--ease),
      visibility var(--move), padding var(--move) var(--ease);
  }

  .primary-nav[data-open="true"] {
    max-height: 600px;
    padding: 12px 18px 20px;
    opacity: 1;
    visibility: visible;
  }

  .primary-nav[data-open="true"] .primary-nav__item:nth-child(odd) { transform: translateX(-4px); }
  .primary-nav[data-open="true"] .primary-nav__item:nth-child(even) { transform: translateX(6px); }

  .primary-nav__item {
    transition: transform var(--move) var(--ease);
  }

  .nav-link {
    padding: 12px 4px;
    font-size: 14px;
    border-bottom: 1px solid var(--line);
  }

  .site-header.is-condensed .nav-link { padding: 12px 4px; }

  .nav-link::after,
  .site-header.is-condensed .nav-link::after {
    bottom: 6px;
    height: 1.5px;
  }

  .nav-utility { margin-left: auto; }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 18px; }
  .col-main, .col-side { grid-column: span 6; }
  .col-rail { grid-column: span 6; }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 26px;
  }

  .footer-grid > .footer-col--brand { grid-column: 1 / -1; }
  .footer-grid > .footer-col:nth-child(3) { grid-column: auto; }

  .footer-legal { flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer-legal__icp { margin-left: 0; }
}

@media (max-width: 620px) {
  :root { --gutter: 16px; }

  .brand-strip__inner { padding: 10px var(--gutter); gap: 10px; }
  .brand-meta { order: 3; width: 100%; }
  .brand-strip__cta { margin-left: auto; }

  .primary-nav { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-note { max-width: none; }

  .glass-panel { padding: 18px; }

  .btn { padding: 12px 18px; }
}

/* ---------- 18. 减少动效 ---------- */
@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] {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .facet-btn:hover,
  .footer-list a:hover {
    transform: none;
  }
}