/* =========================================================
   28体育赛场 — /assets/site.css
   共享外壳：reset / tokens / 刊头 / 速览条 / 导航 / 页脚 / 基础组件
   ========================================================= */

/* ---------- 1. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; }
summary { cursor: pointer; }
:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; border-radius: 3px; }

/* ---------- 2. tokens ---------- */
:root {
  --ink-950: #061713;
  --ink-900: #0B2A25;
  --ink-700: #14453c;
  --cyan: #43F0CF;
  --cyan-deep: #0e8f7d;
  --ice: #CFEFF5;
  --orange: #FF8A3D;
  --paper: #F5FBF8;
  --slate: #2D4A44;
  --mist: #7FA79E;
  --lemon: #D8FF6A;
  --coral: #FF6B5E;

  --gutter: clamp(1rem, 4vw, 3rem);
  --wrap: 78rem;

  --radius-lg: 28px;
  --radius-md: 16px;
  --radius-sm: 10px;

  --font-display: "Helvetica Neue", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Courier New", monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --line-soft: rgba(67, 240, 207, .22);
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  font-family: var(--font-body);
  font-size: clamp(1rem, .95rem + .2vw, 1.075rem);
  line-height: 1.7;
  color: var(--ink-900);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ---------- 3. skip link ---------- */
.skip-link {
  position: fixed;
  top: .5rem;
  left: .5rem;
  z-index: 999;
  padding: .65rem 1.1rem;
  border-radius: 999px;
  background: var(--lemon);
  color: var(--ink-950);
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform .25s var(--ease);
}
.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 2px;
}

/* ---------- 4. 刊头 ---------- */
.site-header {
  position: relative;
  z-index: 40;
  color: var(--paper);
  background:
    radial-gradient(120% 90% at 82% -10%, rgba(207, 239, 245, .22), transparent 58%),
    linear-gradient(158deg, var(--ink-950) 0%, var(--ink-900) 52%, var(--ink-700) 100%);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}
.site-header::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -8%;
  width: 56%;
  height: 190%;
  background: linear-gradient(200deg, rgba(67, 240, 207, .16), rgba(207, 239, 245, .05) 55%, transparent 78%);
  transform: skewX(-17deg);
  pointer-events: none;
}

/* 滚动进度光条 */
.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 120;
  background: rgba(6, 23, 19, .45);
  pointer-events: none;
}
.scroll-meter__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--lemon) 55%, var(--orange) 100%);
}

/* 速览条 */
.ticker {
  position: relative;
  z-index: 2;
  border-bottom: 1px solid rgba(207, 239, 245, .16);
  background: rgba(6, 23, 19, .5);
}
.ticker__inner {
  width: min(var(--wrap), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  padding-block: .45rem;
  display: flex;
  align-items: center;
  gap: clamp(.6rem, 2vw, 1.4rem);
  font-size: .82rem;
}
.ticker__label {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  flex: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .2em;
  color: var(--cyan);
  text-transform: uppercase;
}
.ticker__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lemon);
  box-shadow: 0 0 0 4px rgba(216, 255, 106, .16);
  animation: ticker-pulse 2.4s ease-in-out infinite;
}
@keyframes ticker-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .45; transform: scale(.78); }
}
.ticker__track {
  flex: 1 1 auto;
  min-width: 0;
  display: grid;
  color: rgba(245, 251, 248, .88);
}
.ticker__item {
  grid-area: 1 / 1;
  display: flex;
  align-items: center;
  gap: .55rem;
  min-width: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(5px);
  transition: opacity .5s var(--ease), transform .5s var(--ease), visibility .5s linear;
}
.ticker__item.is-active {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.ticker__link {
  display: block;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  text-decoration: none;
  letter-spacing: .03em;
}
.ticker__link:hover { color: var(--cyan); }
.ticker__tag {
  display: inline-block;
  margin-inline-end: .5em;
  padding: .05em .55em;
  border: 1px solid rgba(67, 240, 207, .45);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  color: var(--cyan);
}
.ticker__cta {
  flex: none;
  font-size: .76rem;
  letter-spacing: .12em;
  text-decoration: none;
  color: var(--orange);
  border-bottom: 1px solid rgba(255, 138, 61, .45);
}

/* 报头 */
.masthead {
  position: relative;
  z-index: 2;
  width: min(var(--wrap), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  padding-block: clamp(1.1rem, 3vw, 2.1rem);
  text-align: center;
}
.masthead__eyebrow {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .34em;
  color: var(--mist);
  text-transform: uppercase;
}
.masthead__brand {
  display: inline-flex;
  align-items: center;
  gap: clamp(.5rem, 1.6vw, .9rem);
  margin-top: .55rem;
  text-decoration: none;
}
.masthead__mark {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
  line-height: 1;
  color: var(--cyan);
  padding: .3em .42em;
  border: 1px solid rgba(67, 240, 207, .5);
  border-radius: 8px;
  background: rgba(67, 240, 207, .08);
}
.masthead__wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(1.55rem, 4.4vw, 2.7rem);
  line-height: 1;
  letter-spacing: .1em;
  color: var(--paper);
}
.masthead__brand:hover .masthead__wordmark { color: var(--ice); }
.masthead__tagline {
  margin-top: .6rem;
  font-size: clamp(.8rem, 1.4vw, .95rem);
  letter-spacing: .16em;
  color: var(--ice);
}

/* 栏目带 */
.header__bar {
  position: relative;
  z-index: 3;
  width: min(var(--wrap), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  padding-block: .1rem .35rem;
  border-top: 1px solid var(--line-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}
.primary-nav { width: 100%; }
.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(.4rem, 2vw, 1.9rem);
}
.primary-nav__item { display: block; }
.primary-nav__link {
  position: relative;
  display: inline-block;
  padding: .6rem .3rem;
  font-size: .9rem;
  letter-spacing: .1em;
  color: rgba(245, 251, 248, .8);
  text-decoration: none;
  transition: color .2s var(--ease);
}
.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .3rem;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .28s var(--ease);
}
.primary-nav__link:hover,
.primary-nav__link:focus-visible { color: var(--paper); }
.primary-nav__link:hover::after,
.primary-nav__link:focus-visible::after { transform: scaleX(1); }
.primary-nav__link[aria-current="page"] {
  color: var(--cyan);
  font-weight: 700;
}
.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: linear-gradient(90deg, var(--cyan), var(--lemon));
}

/* 移动端栏目按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  padding: .5rem .95rem;
  border: 1px solid rgba(67, 240, 207, .45);
  border-radius: 999px;
  background: rgba(67, 240, 207, .08);
  color: var(--ice);
  font-size: .82rem;
  letter-spacing: .14em;
}
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background .2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform .25s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  color: var(--paper);
  background:
    radial-gradient(90% 70% at 12% 0%, rgba(207, 239, 245, .14), transparent 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-950) 68%);
  border-top: 1px solid var(--line-soft);
  padding-block: clamp(2.2rem, 5vw, 4rem) clamp(1.1rem, 2vw, 1.6rem);
}
.footer__grid {
  width: min(var(--wrap), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.55fr) minmax(0, 1.2fr);
  gap: clamp(1.6rem, 4vw, 3.4rem);
}
.footer__brand { display: grid; gap: .8rem; align-content: start; }
.footer__wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  letter-spacing: .12em;
  color: var(--paper);
  text-decoration: none;
}
.footer__wordmark:hover { color: var(--cyan); }
.footer__desc {
  max-width: 30ch;
  font-size: .9rem;
  line-height: 1.75;
  color: rgba(245, 251, 248, .72);
}
.footer__cta { justify-self: start; margin-top: .3rem; }
.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 2rem);
}
.footer__group { min-width: 0; }
.footer__title {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 400;
  letter-spacing: .26em;
  color: var(--cyan);
  margin-bottom: .75rem;
}
.footer__list { display: grid; gap: .45rem; }
.footer__link {
  font-size: .9rem;
  color: rgba(245, 251, 248, .78);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.footer__link:hover,
.footer__link:focus-visible { color: var(--cyan); border-bottom-color: rgba(67, 240, 207, .5); }
.footer__contact { display: grid; gap: .6rem; align-content: start; }
.footer__line {
  display: grid;
  gap: .1rem;
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.5;
  color: rgba(245, 251, 248, .86);
  word-break: break-word;
}
.footer__label {
  font-family: var(--font-body);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--mist);
}
.footer__note {
  font-size: .78rem;
  line-height: 1.7;
  color: rgba(245, 251, 248, .58);
}
.footer__base {
  width: min(var(--wrap), calc(100% - 2 * var(--gutter)));
  margin: clamp(1.6rem, 4vw, 2.8rem) auto 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(207, 239, 245, .16);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer__legal { display: flex; flex-wrap: wrap; gap: .4rem 1.2rem; }
.footer__icp,
.footer__copy {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .06em;
  color: rgba(245, 251, 248, .6);
}
.to-top {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem 1rem;
  border: 1px solid rgba(67, 240, 207, .4);
  border-radius: 999px;
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--cyan);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s linear, background .2s var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: rgba(67, 240, 207, .14); }

/* ---------- 6. 版心与章节 ---------- */
.wrap {
  width: min(var(--wrap), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
}
.section {
  position: relative;
  padding-block: clamp(2.4rem, 6vw, 5rem);
}
.section--ice {
  background:
    radial-gradient(80% 60% at 88% 0%, rgba(245, 251, 248, .9), transparent 62%),
    linear-gradient(178deg, #E9F8FB 0%, var(--ice) 74%, #BFE4EC 100%);
  color: var(--ink-900);
}
.section--ink {
  background:
    radial-gradient(70% 60% at 15% 0%, rgba(67, 240, 207, .16), transparent 60%),
    linear-gradient(152deg, var(--ink-950), var(--ink-900) 70%, var(--ink-700));
  color: var(--paper);
}
.section__head {
  display: grid;
  gap: .6rem;
  max-width: 62ch;
  margin-bottom: clamp(1.4rem, 3vw, 2.4rem);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}
.section--ink .eyebrow { color: var(--cyan); }
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}
.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  line-height: 1.05;
  letter-spacing: .01em;
  font-size: clamp(2rem, 5.6vw, 3.8rem);
}
.section__title {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: .01em;
  font-size: clamp(1.45rem, 3.2vw, 2.4rem);
}
.section__lede,
.lede {
  max-width: 52ch;
  font-size: clamp(.95rem, 1.4vw, 1.08rem);
  line-height: 1.8;
  color: var(--slate);
}
.section--ink .section__lede,
.section--ink .lede { color: var(--ice); }

/* ---------- 7. 网格与卡片 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 2rem);
}
.grid--split {
  grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  align-items: start;
}
.stack { display: grid; gap: clamp(.7rem, 1.5vw, 1.1rem); }
.card {
  position: relative;
  background: #fff;
  border: 1px solid rgba(45, 74, 68, .14);
  border-radius: var(--radius-md);
  padding: clamp(1rem, 2vw, 1.6rem);
  box-shadow: 0 22px 44px -34px rgba(11, 42, 37, .75);
}
.card--ink {
  background: rgba(6, 23, 19, .82);
  border-color: rgba(67, 240, 207, .24);
  color: var(--paper);
  box-shadow: 0 26px 50px -34px rgba(0, 0, 0, .8);
}
.card__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 1.8vw, 1.2rem);
  line-height: 1.35;
  letter-spacing: .01em;
}
.card__text {
  margin-top: .45rem;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--slate);
}
.card--ink .card__text { color: rgba(245, 251, 248, .78); }

/* ---------- 8. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35em;
  padding: .18em .7em;
  border-radius: 999px;
  font-size: .72rem;
  letter-spacing: .14em;
  line-height: 1.7;
  white-space: nowrap;
}
.tag--cyan { background: var(--ink-900); color: var(--cyan); }
.tag--orange { background: var(--orange); color: #26130a; font-weight: 700; }
.tag--lemon { background: var(--lemon); color: #1b2a06; font-weight: 700; }

/* ---------- 9. 时间轴 ---------- */
.timeline {
  display: grid;
  gap: clamp(1rem, 2vw, 1.5rem);
  padding-left: 1.35rem;
  border-left: 1px solid rgba(67, 240, 207, .4);
}
.timeline__item { position: relative; }
.timeline__item::before {
  content: "";
  position: absolute;
  top: .6rem;
  left: calc(-1.35rem - 5px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(67, 240, 207, .18);
}
.section--ice .timeline { border-left-color: rgba(45, 74, 68, .28); }
.section--ice .timeline__item::before { background: var(--cyan-deep); box-shadow: 0 0 0 4px rgba(14, 143, 125, .16); }
.timeline__meta {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--mist);
}
.section--ice .timeline__meta { color: var(--slate); }
.timeline__body {
  font-size: .95rem;
  line-height: 1.75;
}

/* ---------- 10. 展开组件 ---------- */
.disclosure {
  background: #fff;
  border: 1px solid rgba(45, 74, 68, .16);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.disclosure + .disclosure { margin-top: .55rem; }
.disclosure__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .85rem 1.05rem;
  font-weight: 700;
  font-size: .95rem;
  list-style: none;
}
.disclosure__summary::-webkit-details-marker { display: none; }
.disclosure__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--cyan-deep);
}
.disclosure[open] .disclosure__summary::after { content: "–"; }
.disclosure__body {
  padding: 0 1.05rem 1.05rem;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 11. 按钮 ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .62rem 1.35rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-decoration: none;
  transition: transform .2s var(--ease), background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.button:hover { transform: translateY(-1px); }
.button--solid { background: var(--orange); color: #26130a; }
.button--solid:hover { background: #ff9d5c; }
.button--ghost {
  border-color: rgba(67, 240, 207, .55);
  background: rgba(67, 240, 207, .07);
  color: var(--cyan);
}
.button--ghost:hover { background: rgba(67, 240, 207, .16); color: var(--ice); }
.button--quiet {
  background: var(--ice);
  border-color: rgba(45, 74, 68, .22);
  color: var(--ink-900);
}
.button--quiet:hover { background: #ddf5fa; }

/* ---------- 12. 面包屑 ---------- */
.breadcrumbs {
  padding-block: .9rem;
  font-size: .8rem;
}
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: .4rem; }
.breadcrumbs__link {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 74, 68, .3);
}
.breadcrumbs__link:hover { color: var(--cyan-deep); border-bottom-color: var(--cyan-deep); }
.breadcrumbs__sep { color: var(--mist); font-family: var(--font-mono); }
.breadcrumbs__current { color: var(--ink-900); font-weight: 700; }

/* ---------- 13. 图片容器 ---------- */
.figure {
  display: grid;
  gap: .55rem;
  margin: 0;
}
.figure__frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(70% 60% at 80% 8%, rgba(207, 239, 245, .3), transparent 62%),
    linear-gradient(140deg, var(--ink-900) 0%, #123f38 58%, #1d6f62 100%);
}
.figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(255, 255, 255, .18), transparent 42%);
  transform: skewX(-12deg);
  pointer-events: none;
}
.figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.figure__caption {
  font-size: .78rem;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--mist);
}
.figure--wide .figure__frame { aspect-ratio: 21 / 9; }
.figure--portrait .figure__frame { aspect-ratio: 3 / 4; }

/* ---------- 14. 显现动效协议 ---------- */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  will-change: opacity, transform;
}
.js-reveal [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}
.js-reveal [data-reveal-delay="1"] { transition-delay: .07s; }
.js-reveal [data-reveal-delay="2"] { transition-delay: .14s; }
.js-reveal [data-reveal-delay="3"] { transition-delay: .21s; }
.js-reveal [data-reveal-delay="4"] { transition-delay: .28s; }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--split { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 980px) {
  .footer__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer__brand { grid-column: 1 / -1; }
  .footer__contact { grid-column: 1 / -1; }
}
@media (max-width: 860px) {
  .header__bar {
    flex-direction: column;
    align-items: stretch;
    gap: .25rem;
    padding-block: .5rem .6rem;
  }
  .nav-toggle {
    display: inline-flex;
    align-self: flex-end;
  }
  .primary-nav { display: none; }
  .primary-nav[data-open] { display: block; }
  .site-header[data-open] .primary-nav { display: block; }
  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-top: .4rem;
  }
  .primary-nav__link {
    display: block;
    padding: .8rem .35rem;
    font-size: 1rem;
    border-bottom: 1px solid rgba(67, 240, 207, .14);
  }
  .primary-nav__link::after { display: none; }
  .primary-nav__link[aria-current="page"] {
    background: rgba(67, 240, 207, .1);
    border-radius: 6px;
    padding-inline: .7rem;
  }
  .masthead { padding-block: 1.1rem 1.2rem; }
}
@media (max-width: 640px) {
  .ticker__inner { gap: .5rem; font-size: .76rem; }
  .ticker__cta { display: none; }
  .ticker__tag { font-size: .62rem; }
  .masthead__eyebrow { letter-spacing: .22em; }
  .footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__base { flex-direction: column; align-items: flex-start; gap: .8rem; }
  .footer__legal { flex-direction: column; gap: .15rem; }
}

/* ---------- 16. 无障碍与减动 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0s !important;
  }
  .js-reveal [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
  .to-top { opacity: 1; visibility: visible; transform: none; }
}