/* ============================================================
   亚洲体育赛事 · 共享样式 /assets/site.css
   夜场墨绿 × 荧光青 × 行动橙红 · 展览画册式骨架
   ============================================================ */

/* ---------- 01 · 变量 ---------- */
:root {
  --ink: #0B1F1A;
  --ink-2: #12352C;
  --ink-3: #0E2A23;
  --cyan: #39F2D0;
  --paper: #F3EBDD;
  --paper-2: #DED2BC;
  --orange: #FF5A36;
  --orange-deep: #C93B1C;
  --gold: #D6A84B;
  --black: #06120F;
  --mist: #8FB7AC;
  --white: #FFF9EE;

  --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-editorial: "Songti SC", "Noto Serif SC", "Source Han Serif SC", SimSun, Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --maxw: 1320px;
  --gutter: clamp(1.15rem, 4vw, 3.5rem);
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 20px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: .2s;

  --line: rgba(57, 242, 208, .18);
  --line-soft: rgba(57, 242, 208, .1);
  --ink-line: rgba(11, 31, 26, .16);
  --text-soft: rgba(255, 249, 238, .72);
}

/* ---------- 02 · Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; }
hr { border: 0; }

/* ---------- 03 · 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(120% 90% at 8% -12%, rgba(57, 242, 208, .1), transparent 62%),
    radial-gradient(90% 70% at 100% 0%, rgba(255, 90, 54, .06), transparent 60%);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--cyan); color: var(--black); }

h1, h2, h3, h4 { font-weight: 800; line-height: 1.2; letter-spacing: -.01em; }
p { max-width: 68ch; }

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 3px;
}

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

/* ---------- 04 · 布局骨架 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.band { padding-block: clamp(2.5rem, 6vw, 5rem); }
.band--ink { background: transparent; color: var(--white); }
.band--alt {
  background: var(--ink-2);
  border-block: 1px solid var(--line-soft);
  color: var(--white);
}
.band--paper { background: var(--paper); color: #16241F; }
.band--paper h1, .band--paper h2, .band--paper h3 { color: var(--ink); }
.band--paper .lede { color: rgba(11, 31, 26, .74); }
.band--paper .eyebrow { color: var(--orange-deep); }

.grid { display: grid; gap: clamp(1rem, 2.5vw, 2rem); }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.rule {
  height: 1px;
  background: linear-gradient(90deg, rgba(57, 242, 208, .55), rgba(57, 242, 208, 0));
  margin-block: clamp(1.2rem, 3vw, 2.2rem);
}
.band--paper .rule {
  background: linear-gradient(90deg, rgba(11, 31, 26, .35), rgba(11, 31, 26, 0));
}

/* ---------- 05 · 文字层级 ---------- */
.display {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(2.5rem, 6.4vw, 5.5rem);
  line-height: .95;
  letter-spacing: -.025em;
}
.editorial-title {
  font-family: var(--font-editorial);
  font-weight: 700;
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.28;
  letter-spacing: .01em;
}
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan);
}
.lede {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.75;
  color: var(--text-soft);
}
.u-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}
.link-underline {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 242, 208, .45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.link-underline:hover { border-bottom-color: var(--cyan); color: var(--white); }

/* ---------- 06 · 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .72rem 1.3rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .02em;
  text-decoration: none;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.btn--primary {
  background: var(--orange);
  color: var(--black);
  box-shadow: 0 8px 24px rgba(255, 90, 54, .22);
}
.btn--primary:hover { background: var(--orange-deep); color: var(--white); transform: translateY(-2px); }
.btn--primary:active { background: #A62E13; transform: translateY(0); }
.btn--ghost { border-color: rgba(57, 242, 208, .5); color: var(--cyan); }
.btn--ghost:hover { background: rgba(57, 242, 208, .12); border-color: var(--cyan); transform: translateY(-2px); }
.btn--ghost:active { background: rgba(57, 242, 208, .2); transform: translateY(0); }

/* ---------- 07 · 卡片 / 面板 / 数据 ---------- */
.card {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1rem, 2vw, 1.6rem);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(57, 242, 208, .55);
  box-shadow: 0 20px 44px rgba(6, 18, 15, .55);
}
.card--paper { background: var(--paper); color: #16241F; border-color: var(--ink-line); }
.card--tilt { transform: rotate(-1.6deg); }
.card--tilt:hover { transform: rotate(-1.6deg) translateY(-3px); }
.card--tilt-alt { transform: rotate(1.4deg); }
.card--tilt-alt:hover { transform: rotate(1.4deg) translateY(-3px); }
.card__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: .5rem;
}
.card__title { font-size: 1.1rem; font-weight: 800; line-height: 1.35; }
.card__meta {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.panel {
  background: var(--ink-2);
  border: 1px solid rgba(57, 242, 208, .2);
  border-radius: var(--radius);
  padding: clamp(1rem, 2vw, 1.75rem);
}
.stat { display: flex; flex-direction: column; gap: .15rem; }
.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.05;
  color: var(--cyan);
}
.stat__label {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .2rem .55rem;
  border: 1px solid rgba(57, 242, 208, .35);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--cyan);
  white-space: nowrap;
}
.tag--action { border-color: rgba(255, 90, 54, .6); color: var(--orange); }
.tag--gold { border-color: rgba(214, 168, 75, .6); color: var(--gold); }

/* ---------- 08 · 图片容器（页面阶段放入 img） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, #12352C, #06120F);
  aspect-ratio: 16 / 9;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 3 / 4; }
.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
  transition: transform .35s var(--ease);
}
.media-frame:hover .media-frame__img { transform: scale(1.03); }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(90% 70% at 72% 0%, rgba(57, 242, 208, .22), transparent 65%),
    linear-gradient(180deg, rgba(6, 18, 15, 0), rgba(6, 18, 15, .6));
}
.media-frame__caption {
  position: absolute;
  left: 1rem; right: 1rem; bottom: .85rem;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: rgba(255, 249, 238, .86);
}

/* ---------- 09 · 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: .45rem; }
.breadcrumbs__item + .breadcrumbs__item::before { content: "/"; color: rgba(143, 183, 172, .5); }
.breadcrumbs__link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumbs__link:hover { color: var(--cyan); border-bottom-color: rgba(57, 242, 208, .55); }
.breadcrumbs__item[aria-current="page"] { color: var(--cyan); }

/* ---------- 10 · 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  top: .6rem; left: .6rem;
  z-index: 140;
  padding: .6rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--cyan);
  color: var(--black);
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--white);
  outline-offset: 3px;
}

/* ---------- 11 · 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--ink);
  background-image:
    radial-gradient(120% 150% at 10% -30%, rgba(57, 242, 208, .12), transparent 62%),
    linear-gradient(180deg, rgba(6, 18, 15, .55), rgba(11, 31, 26, 0));
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: .85rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}
.scroll-progress {
  position: absolute;
  left: 0; bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  pointer-events: none;
}

/* 品牌 */
.brand-lockup { display: flex; align-items: center; gap: .75rem; min-width: 0; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  text-decoration: none;
  color: var(--white);
}
.brand__mark {
  position: relative;
  width: 34px; height: 34px;
  flex: 0 0 auto;
  border-radius: 10px 3px 10px 3px;
  background: linear-gradient(150deg, var(--cyan), #1A8F7D 72%);
  box-shadow: 0 0 0 1px rgba(57, 242, 208, .5), 0 0 22px rgba(57, 242, 208, .32);
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 9px 8px;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: skewX(-12deg);
}
.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name {
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: .02em;
}
.brand__line {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .2em;
  color: var(--mist);
  white-space: nowrap;
}
.cert-seal {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .18rem .55rem;
  border: 1px solid rgba(214, 168, 75, .45);
  border-radius: 999px;
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--gold);
  white-space: nowrap;
}
.cert-seal__ring {
  width: .48rem; height: .48rem;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(214, 168, 75, .22);
}

/* 导航 */
.site-nav { display: flex; align-items: center; gap: 1.35rem; }
.nav-track {
  position: relative;
  display: flex;
  align-items: center;
  gap: .1rem;
}
.nav-track::before {
  content: "";
  position: absolute;
  left: .6rem; right: .6rem; bottom: .12rem;
  height: 1px;
  background-image: repeating-linear-gradient(90deg, rgba(57, 242, 208, .3) 0 1px, transparent 1px 13px);
}
.nav-track__item { display: flex; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: .38rem;
  padding: .5rem .6rem;
  border-radius: 5px;
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: rgba(255, 249, 238, .78);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-link__num {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .06em;
  color: rgba(143, 183, 172, .62);
  transition: color var(--dur) var(--ease);
}
.nav-link__text { white-space: nowrap; }
.nav-link::after {
  content: "";
  position: absolute;
  left: .6rem; right: .6rem; bottom: .12rem;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-link:hover { color: var(--cyan); background-color: rgba(57, 242, 208, .07); }
.nav-link:hover::after { transform: scaleX(1); background: rgba(57, 242, 208, .6); }
.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"] .nav-link__num { color: var(--cyan); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--cyan); }

.header-actions {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: .4rem;
  padding-left: 1rem;
  border-left: 1px solid var(--line);
}
.header-actions__label {
  font-family: var(--font-mono);
  font-size: .58rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(143, 183, 172, .7);
  margin-right: .15rem;
}
.path-chip {
  display: inline-flex;
  align-items: center;
  padding: .34rem .7rem;
  border: 1px solid rgba(57, 242, 208, .35);
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--white);
  text-decoration: none;
  white-space: nowrap;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.path-chip:hover {
  background: rgba(57, 242, 208, .12);
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-1px);
}
.path-chip:active { transform: translateY(0); }
.path-chip--action {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--black);
}
.path-chip--action:hover { background: var(--orange-deep); border-color: var(--orange-deep); color: var(--white); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .5rem .7rem;
  border: 1px solid rgba(57, 242, 208, .35);
  border-radius: 999px;
  color: var(--cyan);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .1em;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav-toggle:hover { background: rgba(57, 242, 208, .1); border-color: var(--cyan); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] { border-color: var(--cyan); background: rgba(57, 242, 208, .14); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 12 · 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--black);
  border-top: 1px solid rgba(57, 242, 208, .22);
  color: rgba(255, 249, 238, .8);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(80% 120% at 88% -20%, rgba(57, 242, 208, .14), transparent 62%),
    repeating-linear-gradient(90deg, rgba(57, 242, 208, .045) 0 1px, transparent 1px 96px);
}
.site-footer__inner {
  position: relative;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(2.4rem, 5vw, 4rem) var(--gutter) clamp(1.6rem, 3vw, 2.4rem);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 2fr);
  gap: clamp(1.6rem, 4vw, 3rem);
}
.footer-lead { display: flex; flex-direction: column; align-items: flex-start; }
.footer-brand { display: block; }
.footer-brand__name {
  display: block;
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--white);
}
.footer-brand__line {
  display: block;
  margin-top: .35rem;
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
}
.footer-note {
  margin-top: 1rem;
  max-width: 32ch;
  font-size: .85rem;
  line-height: 1.75;
  color: rgba(255, 249, 238, .62);
}
.footer-cert {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  margin-top: 1.1rem;
  padding: .2rem .6rem;
  border: 1px solid rgba(214, 168, 75, .45);
  border-radius: 999px;
  font-size: .68rem;
  letter-spacing: .12em;
  color: var(--gold);
}
.footer-cert__ring {
  width: .46rem; height: .46rem;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(214, 168, 75, .2);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.2rem, 3vw, 2.4rem);
}
.footer-col { min-width: 0; }
.footer-col__title {
  margin-bottom: .85rem;
  font-family: var(--font-mono);
  font-size: .66rem;
  font-weight: 600;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-list { display: grid; gap: .45rem; }
.footer-list__link {
  display: inline-block;
  font-size: .92rem;
  color: rgba(255, 249, 238, .8);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-list__link:hover { color: var(--cyan); border-bottom-color: rgba(57, 242, 208, .7); }

.footer-contact { display: grid; gap: .75rem; }
.footer-contact__item { display: grid; gap: .12rem; }
.footer-contact__k {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
}
.footer-contact__v {
  font-size: .9rem;
  color: var(--white);
  overflow-wrap: anywhere;
}

.footer-bottom { border-top: 1px solid rgba(57, 242, 208, .16); }
.footer-bottom__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 1rem var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.4rem;
}
.footer-bottom__meta {
  margin: 0;
  font-size: .74rem;
  letter-spacing: .06em;
  color: rgba(255, 249, 238, .55);
}
.footer-icp { color: rgba(143, 183, 172, .8); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-legal__link {
  color: rgba(255, 249, 238, .72);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 242, 208, .3);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-legal__link:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

/* ---------- 13 · 响应式 ---------- */
@media (max-width: 1279px) {
  .header-actions__label { display: none; }
  .nav-link { padding: .5rem .45rem; font-size: .9rem; }
  .site-nav { gap: 1rem; }
  .path-chip { padding: .32rem .6rem; font-size: .74rem; }
}

@media (max-width: 1099px) {
  .header-actions { display: none; }
}

@media (max-width: 959px) {
  .site-header__inner { padding-block: .7rem; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: .9rem;
    max-height: calc(100vh - 4.5rem);
    overflow-y: auto;
    padding: 1rem var(--gutter) 1.4rem;
    background: var(--ink-2);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 52px rgba(6, 18, 15, .62);
  }
  .site-nav[data-open] { display: flex; }
  .nav-track { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-track::before { display: none; }
  .nav-track__item { display: block; }
  .nav-link {
    display: flex;
    align-items: baseline;
    gap: .6rem;
    padding: .72rem .2rem;
    border-radius: 0;
    border-bottom: 1px solid rgba(57, 242, 208, .12);
    font-size: 1rem;
  }
  .nav-link::after { left: 0; right: auto; width: 34px; bottom: 0; }
  .nav-link:hover { background-color: rgba(57, 242, 208, .06); }
  .header-actions {
    display: flex;
    flex-wrap: wrap;
    padding: .9rem 0 0;
    border-left: 0;
    border-top: 1px solid rgba(57, 242, 208, .18);
  }
  .header-actions__label { display: inline; }
  .path-chip { font-size: .8rem; padding: .4rem .75rem; }

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

  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 559px) {
  .brand__name { font-size: .95rem; }
  .brand__line { display: none; }
  .brand__mark { width: 30px; height: 30px; }
  .cert-seal { font-size: .6rem; padding: .16rem .45rem; letter-spacing: .06em; }
  .nav-toggle { padding: .45rem .6rem; font-size: .74rem; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom__inner { flex-direction: column; align-items: flex-start; }
  .display { font-size: clamp(2.1rem, 11vw, 3.2rem); }
}

/* ---------- 14 · 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
  .card:hover, .card--tilt:hover, .card--tilt-alt:hover,
  .btn:hover, .path-chip:hover, .media-frame:hover .media-frame__img { transform: none; }
}