/* ============================================================
   天行体育 · apex-tianxing.com.cn
   /assets/site.css — 全站共享层
   深空蓝基底 / 荧光青数据线 / 活力橙动作 / 7° 斜切
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body { margin: 0; }

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, pre { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

a { color: inherit; }

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; cursor: pointer; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink-900: #050F1E;
  --ink-800: #0A1B31;
  --ink-700: #122B49;
  --cyan: #2FF3D0;
  --mist: #8FF8E6;
  --orange: #FF6B35;
  --warm: #F6F1E7;
  --fog: #A7B6C8;
  --ink-deep: #03101F;
  --violet: #6C5CE7;

  --font-display: "HarmonyOS Sans SC", "Noto Sans SC", "Source Han Sans SC",
    "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "PingFang SC", "HarmonyOS Sans SC",
    "Microsoft YaHei", system-ui, sans-serif;
  --font-data: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular",
    Consolas, "Courier New", monospace;

  --fs-96: clamp(2.75rem, 7.2vw, 6rem);
  --fs-64: clamp(2.25rem, 5vw, 4rem);
  --fs-40: clamp(1.75rem, 3.4vw, 2.5rem);
  --fs-28: clamp(1.375rem, 2.2vw, 1.75rem);
  --fs-20: 1.25rem;
  --fs-18: 1.125rem;
  --fs-16: 1rem;
  --fs-13: 0.8125rem;

  --shell: 1280px;
  --read: 720px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --slant: 7deg;

  --edge: 1px solid var(--ink-700);
  --radius: 2px;
  --shadow-soft: 0 1px 0 rgba(47, 243, 208, 0.06), 0 18px 36px -24px rgba(3, 16, 31, 0.9);

  --ease: cubic-bezier(0.4, 0.15, 0.2, 1);
  --t-fast: 180ms;
  --t-mid: 240ms;
  --t-slow: 320ms;
}

/* ---------- 3. Base ---------- */
body {
  background:
    radial-gradient(120% 78% at 84% -12%, rgba(47, 243, 208, 0.10), transparent 58%),
    radial-gradient(92% 66% at 4% 2%, rgba(108, 92, 231, 0.16), transparent 62%),
    var(--ink-900);
  background-attachment: fixed;
  color: var(--warm);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background: rgba(47, 243, 208, 0.28);
  color: var(--warm);
}

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

p { line-height: 1.8; }

strong { color: var(--warm); font-weight: 700; }

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

.read {
  width: 100%;
  max-width: var(--read);
  margin-inline: auto;
}

.section {
  padding-block: clamp(3rem, 7vw, 6rem);
}

.section--tight {
  padding-block: clamp(2rem, 4vw, 3rem);
}

.layout-main {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--min, 260px), 1fr));
  gap: clamp(1rem, 2vw, 1.75rem);
}

/* ---------- 5. 排版组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--cyan);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.eyebrow--orange { color: var(--orange); }
.eyebrow--orange::before { background: var(--orange); }
.eyebrow--muted { color: var(--fog); }
.eyebrow--muted::before { background: var(--fog); }

.display-lg,
.display-md,
.display-sm {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.06;
  color: var(--warm);
  text-wrap: balance;
}

.display-lg { font-size: var(--fs-96); }
.display-md { font-size: var(--fs-64); }
.display-sm { font-size: var(--fs-40); line-height: 1.15; }

.lede {
  max-width: 34em;
  font-size: var(--fs-18);
  line-height: 1.8;
  color: var(--fog);
}

.prose {
  max-width: var(--read);
  color: var(--fog);
}

.prose p + p { margin-top: 1.1em; }
.prose h2,
.prose h3 { color: var(--warm); margin-top: 1.6em; margin-bottom: 0.5em; }

.prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 208, 0.4);
  transition: border-color var(--t-fast) var(--ease);
}

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

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--ink-700);
}

/* ---------- 6. 数据组件 ---------- */
.data {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

.data__value {
  font-size: var(--fs-40);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--warm);
}

.data__unit {
  font-size: var(--fs-13);
  font-weight: 600;
  color: var(--cyan);
  margin-left: 0.15em;
}

.data__label {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fog);
  text-transform: uppercase;
}

/* ---------- 7. 按钮与胶囊 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  font-size: var(--fs-13);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--solid {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink-deep);
}

.btn--solid:hover { background: #ff8355; border-color: #ff8355; }

.btn--line {
  background: rgba(47, 243, 208, 0.05);
  border-color: rgba(47, 243, 208, 0.5);
  color: var(--cyan);
}

.btn--line:hover {
  background: rgba(47, 243, 208, 0.14);
  border-color: var(--cyan);
  color: var(--warm);
}

.btn--quiet {
  color: var(--fog);
  border-color: transparent;
  padding-inline: 0.35rem;
}

.btn--quiet:hover { color: var(--cyan); }

.btn__arrow {
  display: inline-block;
  transition: transform var(--t-fast) var(--ease);
}

.btn:hover .btn__arrow { transform: translateX(4px); }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1rem;
  border: 1px solid rgba(167, 182, 200, 0.35);
  border-radius: 999px;
  background: transparent;
  color: var(--fog);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    background var(--t-fast) var(--ease);
}

.pill:active { transform: translateY(1px); }

.pill--cyan {
  border-color: rgba(47, 243, 208, 0.55);
  color: var(--cyan);
  background: rgba(47, 243, 208, 0.06);
}

.pill--cyan:hover {
  border-color: var(--cyan);
  color: var(--warm);
  background: rgba(47, 243, 208, 0.14);
}

.pill--orange {
  border-color: rgba(255, 107, 53, 0.55);
  color: var(--orange);
  background: rgba(255, 107, 53, 0.07);
}

.pill--orange:hover {
  border-color: var(--orange);
  background: rgba(255, 107, 53, 0.16);
  color: var(--warm);
}

.tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
  text-transform: uppercase;
}

.tag--violet { color: var(--violet); border-color: rgba(108, 92, 231, 0.5); }

/* ---------- 8. 卡片与媒体 ---------- */
.card {
  position: relative;
  display: block;
  padding: clamp(1.1rem, 2vw, 1.6rem);
  background: var(--ink-800);
  border: var(--edge);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  text-decoration: none;
  color: inherit;
  transition: transform var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(47, 243, 208, 0.6);
}

.card--panel {
  background: linear-gradient(158deg, rgba(18, 43, 73, 0.55), var(--ink-800) 62%);
}

.media {
  position: relative;
  overflow: hidden;
  display: block;
  aspect-ratio: 16 / 9;
  background: var(--ink-800);
  border: var(--edge);
  border-radius: var(--radius);
}

.media > img,
.media > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-mid) var(--ease);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(142deg, rgba(47, 243, 208, 0.16), transparent 46%, rgba(5, 15, 30, 0.62));
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }

.media--slant {
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.media figcaption {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 1;
  padding: 0.85rem 1rem;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
  background: linear-gradient(0deg, rgba(3, 16, 31, 0.85), transparent);
}

/* ---------- 9. 面包屑与锚点目录 ---------- */
.breadcrumbs {
  padding-block: 1rem 0;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  color: var(--fog);
}

.breadcrumbs-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumbs-item + .breadcrumbs-item::before {
  content: "/";
  color: var(--ink-700);
}

.breadcrumbs-item a {
  color: var(--fog);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

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

.breadcrumbs-item [aria-current="page"] { color: var(--cyan); }

.anchor-nav {
  position: sticky;
  top: 104px;
  display: grid;
  gap: 0.1rem;
  align-content: start;
}

.anchor-nav__title {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fog);
  margin-bottom: 0.6rem;
}

.anchor-nav__link {
  display: block;
  padding: 0.42rem 0 0.42rem 0.9rem;
  border-left: 1px solid var(--ink-700);
  color: var(--fog);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}

.anchor-nav__link:hover { color: var(--warm); }

.anchor-nav__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* ---------- 10. 显现动效协议 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--t-slow) var(--ease),
    transform var(--t-slow) var(--ease);
}

.has-js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 11. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 300;
  transform: translate(-50%, -140%);
  padding: 0.7rem 1.5rem;
  background: var(--cyan);
  color: var(--ink-deep);
  font-size: var(--fs-13);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: transform var(--t-fast) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline: 2px solid var(--warm);
  outline-offset: 2px;
}

/* ============================================================
   12. 站点头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(5, 15, 30, 0.98) 0%, rgba(5, 15, 30, 0.9) 100%);
  border-bottom: 1px solid var(--ink-700);
  backdrop-filter: blur(14px) saturate(1.25);
  -webkit-backdrop-filter: blur(14px) saturate(1.25);
  transition: box-shadow var(--t-mid) var(--ease),
    border-color var(--t-mid) var(--ease);
}

.site-header.is-stuck {
  border-bottom-color: rgba(47, 243, 208, 0.28);
  box-shadow: 0 18px 40px -26px rgba(3, 16, 31, 0.95);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.75rem);
  width: 100%;
  max-width: var(--shell);
  min-height: 72px;
  margin-inline: auto;
  padding: 0 var(--gutter);
}

/* 品牌 —— 压住左端 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
  margin-right: auto;
  padding: 0.4rem 0;
  text-decoration: none;
  color: var(--warm);
}

.brand-glyph {
  position: relative;
  display: block;
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  border: 1px solid var(--cyan);
  background: linear-gradient(140deg, rgba(47, 243, 208, 0.3), transparent 72%);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}

.brand-glyph::after {
  content: "";
  position: absolute;
  top: 6px;
  right: 6px;
  width: 6px;
  height: 6px;
  background: var(--orange);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--warm);
}

.brand-tag {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--fog);
}

/* 导航 —— 贴住右端 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.6vw, 2.5rem);
  flex: 0 0 auto;
}

.nav-group {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.6vw, 1.5rem);
}

.nav-divider {
  display: block;
  width: 1px;
  height: 22px;
  background: var(--ink-700);
  flex: 0 0 auto;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.5rem 0.1rem;
  color: var(--fog);
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 2px;
  height: 1px;
  background: var(--cyan);
  transition: right var(--t-mid) var(--ease);
}

.nav-link:hover { color: var(--warm); }
.nav-link:hover::after { right: 0; }

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

.nav-link[aria-current="page"]::after {
  right: 0;
  background: var(--orange);
}

.nav-num {
  font-family: var(--font-data);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--orange);
  opacity: 0.85;
}

/* 右上快速访问胶囊 */
.header-capsule {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
  padding: 0.55rem 1.05rem;
  border: 1px solid rgba(47, 243, 208, 0.55);
  border-radius: 999px;
  background: rgba(47, 243, 208, 0.06);
  color: var(--cyan);
  font-size: var(--fs-13);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-decoration: none;
  transition: background var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease);
}

.header-capsule:hover {
  background: rgba(47, 243, 208, 0.16);
  border-color: var(--cyan);
  color: var(--warm);
}

.header-capsule:active { transform: translateY(1px); }

.capsule-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.18);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--ink-700);
  border-radius: 999px;
  color: var(--warm);
  transition: border-color var(--t-fast) var(--ease);
}

.nav-toggle:hover { border-color: rgba(47, 243, 208, 0.6); }

.nav-toggle-bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bars span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform var(--t-fast) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child {
  transform: translateY(2.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child {
  transform: translateY(-2.5px) rotate(-45deg);
}

.nav-toggle-label {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fog);
}

/* 滚动进度线 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
  background: transparent;
}

.scroll-progress > i {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width 80ms linear;
}

/* ============================================================
   13. 站点页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(4rem, 9vw, 7rem);
  background: var(--ink-deep);
  border-top: 1px solid var(--ink-700);
  color: var(--fog);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(420px, 42%);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(2.5rem, 5vw, 4rem) var(--gutter) 1.5rem;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1.7fr) minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: start;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  align-items: flex-start;
}

.footer-brand-link {
  margin-right: 0;
  padding: 0;
}

.footer-line {
  max-width: 26em;
  font-size: var(--fs-13);
  line-height: 1.8;
  color: var(--fog);
}

.footer-hours {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: rgba(167, 182, 200, 0.72);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 2rem);
}

.footer-col-title {
  margin-bottom: 0.9rem;
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--warm);
  text-transform: uppercase;
}

.footer-list {
  display: grid;
  gap: 0.55rem;
}

.footer-list a {
  color: var(--fog);
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

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

.footer-contact {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-contact-list {
  display: grid;
  gap: 0.7rem;
  margin-bottom: 1.1rem;
}

.footer-contact-list li {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.footer-contact-label {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: rgba(167, 182, 200, 0.6);
  text-transform: uppercase;
}

.footer-contact-value {
  font-family: var(--font-data);
  font-size: var(--fs-13);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: var(--warm);
  word-break: break-word;
}

.footer-contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding-bottom: 0.15rem;
  border-bottom: 1px solid rgba(47, 243, 208, 0.45);
  color: var(--cyan);
  font-size: var(--fs-13);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease);
}

.footer-contact-link:hover {
  border-color: var(--cyan);
  color: var(--warm);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--ink-700);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(167, 182, 200, 0.75);
}

/* ============================================================
   14. 响应式
   ============================================================ */
@media (max-width: 1040px) {
  .footer-top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .layout-main { grid-template-columns: minmax(0, 1fr); }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 90;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem var(--gutter) 1.5rem;
    background: var(--ink-800);
    border-top: 1px solid var(--ink-700);
    border-bottom: 1px solid var(--ink-700);
    box-shadow: 0 28px 48px -20px rgba(3, 16, 31, 0.9);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
  }

  .site-nav[data-open] { display: flex; }

  .nav-group {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-group li + li { border-top: 1px solid var(--ink-700); }

  .nav-divider {
    width: 100%;
    height: 1px;
    margin: 0.6rem 0;
  }

  .nav-link {
    padding: 0.9rem 0.1rem;
    font-size: 1rem;
    letter-spacing: 0.06em;
    white-space: normal;
  }

  .nav-link::after { display: none; }

  .nav-num { font-size: 10px; }

  .anchor-nav {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 1.5rem;
  }

  .anchor-nav__title {
    width: 100%;
    margin-bottom: 0.2rem;
  }

  .anchor-nav__link {
    padding: 0.3rem 0.75rem;
    border: 1px solid var(--ink-700);
    border-radius: 999px;
    font-size: 12px;
  }

  .anchor-nav__link[aria-current="true"] {
    border-color: var(--cyan);
    background: rgba(47, 243, 208, 0.08);
  }
}

@media (max-width: 760px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-column: auto; }
  .footer-meta { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .header-inner { min-height: 64px; }
  .brand-tag { display: none; }
  .header-capsule { padding: 0.45rem 0.8rem; font-size: 12px; letter-spacing: 0.04em; }
  .nav-toggle { padding: 0.45rem 0.65rem; }
  .display-lg { letter-spacing: -0.015em; }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 420px) {
  .nav-toggle-label { display: none; }
  .site-nav { max-height: calc(100vh - 64px); }
}

/* ============================================================
   15. 减少动态
   ============================================================ */
@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;
  }

  .has-js [data-reveal],
  .has-js [data-reveal].is-revealed {
    opacity: 1 !important;
    transform: none !important;
  }

  .card:hover { transform: none; }
  .btn:hover .btn__arrow { transform: none; }
  .scroll-progress > i { transition: none; }
}