/* ============================================================
   星空体育入口 · 共享样式表 /assets/site.css
   深空控制台基调：纸张叠层 + 印刷边框 + 半透明数据条
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration-color: rgba(255, 122, 26, .5); text-underline-offset: .24em; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --void: #070B14;
  --midnight: #0E1628;
  --panel: #131E33;
  --panel-2: #182741;
  --silver: #D7E2F0;
  --orbit: #8A99AD;
  --signal: #FF7A1A;
  --signal-soft: #FFB37A;
  --mist: #6FB6C9;
  --ok: #7ED6A5;
  --nebula: linear-gradient(135deg, #0E1628 0%, #1B2B44 55%, #FF7A1A 130%);
  --hairline: rgba(138, 153, 173, .22);
  --hairline-soft: rgba(138, 153, 173, .12);
  --radius: 4px;
  --radius-lg: 8px;
  --font-head: "Barlow Condensed", "Oswald", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --shell: 1240px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --sp-section: clamp(3rem, 7vw, 6rem);
  --seek: 140ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--silver);
  background-color: var(--void);
  background-image:
    radial-gradient(1100px 700px at 88% -12%, rgba(111, 182, 201, .12), transparent 62%),
    radial-gradient(900px 620px at 4% 0%, rgba(255, 122, 26, .07), transparent 58%),
    linear-gradient(180deg, #070B14 0%, #080E1A 42%, #070B14 100%);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .55;
  background-image:
    linear-gradient(rgba(138, 153, 173, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 153, 173, .05) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  -webkit-mask-image: radial-gradient(120% 82% at 50% 0%, #000 18%, transparent 86%);
  mask-image: radial-gradient(120% 82% at 50% 0%, #000 18%, transparent 86%);
}
main, .site-header, .site-footer { position: relative; z-index: 1; }
#main-content { display: block; scroll-margin-top: 1rem; }

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--silver);
}
h1 { font-size: clamp(2.4rem, 6vw, 5rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); }
h4 { font-size: 1.0625rem; line-height: 1.35; }
p { max-width: 74ch; }
strong { color: #fff; font-weight: 700; }
::selection { background: rgba(255, 122, 26, .32); color: #fff; }
:focus-visible { outline: 2px solid var(--signal-soft); outline-offset: 3px; border-radius: 2px; }

/* ---------- 4. 工具类 ---------- */
.shell { width: 100%; max-width: var(--shell); margin-inline: auto; padding-inline: var(--gutter); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: .04em; }
.muted { color: var(--orbit); }
.eyebrow {
  display: inline-flex; align-items: center; gap: .6rem;
  font-family: var(--font-mono); font-size: .8125rem;
  letter-spacing: .2em; text-transform: uppercase; color: var(--mist);
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: var(--signal); }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.25rem); line-height: 1.8; color: #C3D1E4; }
.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;
}

/* ---------- 5. 按钮与标签 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .7rem 1.15rem; border: 1px solid var(--hairline); border-radius: var(--radius);
  background: rgba(19, 30, 51, .82); color: var(--silver);
  font-size: .9375rem; font-weight: 600; line-height: 1.2;
  text-decoration: none; cursor: pointer;
  transition: background var(--seek) ease, border-color var(--seek) ease,
              color var(--seek) ease, transform var(--seek) ease;
}
.btn:hover { background: var(--panel-2); border-color: rgba(215, 226, 240, .4); transform: translateY(-1px); }
.btn--signal {
  border-color: transparent; color: #180C02;
  background: linear-gradient(135deg, var(--signal), #FF9A4D);
  box-shadow: 0 14px 30px -20px rgba(255, 122, 26, .95);
}
.btn--signal:hover { background: linear-gradient(135deg, var(--signal-soft), var(--signal)); color: #180C02; }
.btn--ghost { background: transparent; border-color: rgba(255, 122, 26, .5); color: var(--signal-soft); }
.btn--ghost:hover { background: rgba(255, 122, 26, .1); }
.btn--quiet { background: transparent; border-color: var(--hairline); color: var(--orbit); padding: .45rem .7rem; font-size: .8125rem; }

.chip {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .28rem .6rem; border: 1px solid var(--hairline); border-radius: 999px;
  background: rgba(14, 22, 40, .7); color: var(--orbit);
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .06em;
  transition: color var(--seek) ease, border-color var(--seek) ease, background var(--seek) ease;
}
.chip:hover { color: var(--silver); border-color: rgba(215, 226, 240, .38); }
.chip--signal { color: var(--signal-soft); border-color: rgba(255, 122, 26, .45); background: rgba(255, 122, 26, .08); }
.chip--mist { color: var(--mist); border-color: rgba(111, 182, 201, .4); }
.chip--ok { color: var(--ok); border-color: rgba(126, 214, 165, .4); }

/* ---------- 6. 容器：面板 / 卡片 / 数据 ---------- */
.panel {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.75rem);
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(19, 30, 51, .92), rgba(14, 22, 40, .86));
}
.panel::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none;
  background: linear-gradient(180deg, rgba(215, 226, 240, .07), transparent 42%);
}
.panel--flat { background: rgba(14, 22, 40, .62); }
.panel--signal { border-color: rgba(255, 122, 26, .45); box-shadow: inset 0 0 0 1px rgba(255, 122, 26, .08); }

.card {
  position: relative; display: block; height: 100%;
  padding: clamp(1rem, 2vw, 1.4rem);
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(19, 30, 51, .92), rgba(11, 18, 32, .9));
  text-decoration: none;
  transition: transform var(--seek) ease, border-color var(--seek) ease, box-shadow var(--seek) ease;
}
.card:hover { transform: translateY(-3px); border-color: rgba(255, 122, 26, .45); box-shadow: 0 26px 50px -34px rgba(0, 0, 0, .95); }

.stat { display: flex; flex-direction: column; gap: .2rem; }
.stat__value { font-family: var(--font-mono); font-size: clamp(1.4rem, 3vw, 2.1rem); line-height: 1.1; color: var(--silver); }
.stat__label { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .12em; color: var(--orbit); }

/* ---------- 7. 步骤与时间轴 ---------- */
.steps { display: grid; gap: 1rem; }
.step { display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: start; }
.step__num {
  display: grid; place-items: center; width: 2.25rem; height: 2.25rem;
  border: 1px solid rgba(255, 122, 26, .45); border-radius: var(--radius);
  background: rgba(255, 122, 26, .08); color: var(--signal-soft);
  font-family: var(--font-mono); font-size: .875rem;
}
.timeline { position: relative; padding-left: 1.5rem; }
.timeline::before {
  content: ""; position: absolute; left: .32rem; top: .4rem; bottom: .4rem; width: 1px;
  background: linear-gradient(180deg, rgba(255, 122, 26, .6), rgba(111, 182, 201, .35), transparent);
}
.timeline__item { position: relative; padding-bottom: 1.5rem; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: ""; position: absolute; left: -1.42rem; top: .55rem;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--void); border: 1px solid var(--signal);
}
.timeline__item[data-state="current"]::before { background: var(--signal); box-shadow: 0 0 0 4px rgba(255, 122, 26, .16); }

/* ---------- 8. 章节与网格 ---------- */
.section { padding-block: var(--sp-section); }
.section--tight { padding-block: clamp(1.75rem, 4vw, 3rem); }
.section--edge { border-block: 1px solid var(--hairline); }
.section__head {
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between;
  gap: 1rem; margin-bottom: clamp(1.25rem, 3vw, 2.25rem);
}
.grid-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(1rem, 2vw, 1.75rem); }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

/* ---------- 9. 面包屑与正文 ---------- */
.breadcrumb { padding-block: 1rem .25rem; font-family: var(--font-mono); font-size: .8125rem; color: var(--orbit); }
.breadcrumb__list { display: flex; flex-wrap: wrap; gap: .5rem; }
.breadcrumb__item { display: flex; align-items: center; gap: .5rem; }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: rgba(138, 153, 173, .5); }
.breadcrumb a { color: var(--orbit); text-decoration: none; }
.breadcrumb a:hover { color: var(--silver); }
.breadcrumb [aria-current="page"] { color: var(--silver); }

.prose { max-width: 74ch; }
.prose > * + * { margin-top: 1.2em; }
.prose h2 { margin-top: 1.8em; }
.prose h3 { margin-top: 1.5em; }
.prose ul, .prose ol { padding-left: 1.1rem; }
.prose ul li { list-style: none; position: relative; padding-left: 1rem; }
.prose ul li::before {
  content: ""; position: absolute; left: 0; top: .75em;
  width: 6px; height: 1px; background: var(--signal);
}
.prose ol { counter-reset: item; }
.prose ol li { position: relative; padding-left: 1.4rem; }
.prose ol li::before {
  counter-increment: item; content: counter(item, decimal-leading-zero);
  position: absolute; left: 0; font-family: var(--font-mono); font-size: .75rem; color: var(--mist);
}

/* ---------- 10. 图片容器（供页面阶段放置占位图） ---------- */
.media-frame {
  position: relative; display: block; overflow: hidden;
  border: 1px solid var(--hairline); border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(111, 182, 201, .2), transparent 62%),
    linear-gradient(135deg, #0E1628, #1B2B44 58%, #2A2237);
  aspect-ratio: 16 / 10;
}
.media-frame::after {
  content: ""; position: absolute; inset: 8px; border: 1px solid rgba(215, 226, 240, .12);
  border-radius: calc(var(--radius-lg) - 2px); pointer-events: none;
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame__tag {
  position: absolute; left: .75rem; top: .75rem; z-index: 2;
  padding: .22rem .55rem; border: 1px solid rgba(255, 122, 26, .45); border-radius: 999px;
  background: rgba(7, 11, 20, .78); color: var(--signal-soft);
  font-family: var(--font-mono); font-size: .6875rem; letter-spacing: .1em;
}
.media-frame__cap {
  position: absolute; left: .75rem; right: .75rem; bottom: .75rem; z-index: 2;
  padding: .35rem .55rem; border: 1px solid var(--hairline); border-radius: var(--radius);
  background: rgba(7, 11, 20, .74); color: var(--silver);
  font-family: var(--font-mono); font-size: .75rem; line-height: 1.5;
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
figcaption { font-family: var(--font-mono); font-size: .75rem; color: var(--orbit); }

/* ---------- 11. 跳转链接 ---------- */
.skip-link {
  position: absolute; left: .75rem; top: -4.5rem; z-index: 99;
  padding: .6rem 1rem; border-radius: var(--radius);
  background: var(--signal); color: #180C02; font-weight: 700; text-decoration: none;
  transition: top .2s ease;
}
.skip-link:focus { top: .75rem; }

/* ---------- 12. 头部 ---------- */
.site-header {
  position: relative; z-index: 40;
  border-bottom: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(7, 11, 20, .92), rgba(7, 11, 20, .6));
}
.skybar { border-bottom: 1px solid var(--hairline-soft); background: rgba(14, 22, 40, .74); }
.skybar__inner {
  display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem;
  min-height: 38px; padding-block: .35rem;
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .1em; color: var(--orbit);
}
.skybar__brand { max-width: none; color: var(--silver); letter-spacing: .16em; }
.skybar__meta { max-width: none; color: var(--mist); }
.skybar__status { max-width: none; margin-left: auto; display: inline-flex; align-items: center; color: var(--ok); }
.pulse {
  display: inline-block; width: 7px; height: 7px; margin-right: .45rem;
  border-radius: 50%; background: var(--ok);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(126, 214, 165, .5); }
  70% { box-shadow: 0 0 0 8px rgba(126, 214, 165, 0); }
  100% { box-shadow: 0 0 0 0 rgba(126, 214, 165, 0); }
}

.masthead { border-bottom: 1px solid var(--hairline-soft); background: linear-gradient(180deg, rgba(19, 30, 51, .72), rgba(7, 11, 20, .5)); }
.masthead__inner { display: flex; align-items: center; gap: 1.25rem; min-height: 74px; padding-block: .7rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; color: var(--silver); flex: 0 0 auto; }
.brand__mark {
  position: relative; flex: 0 0 32px;
  inline-size: 32px; block-size: 32px;
  display: grid; place-items: center;
  border: 1px solid rgba(215, 226, 240, .34); border-radius: var(--radius);
  background: linear-gradient(135deg, #0E1628, #1B2B44);
}
.brand__mark::before {
  content: ""; width: 8px; height: 8px; transform: rotate(45deg);
  background: var(--signal); box-shadow: 0 0 0 4px rgba(255, 122, 26, .16);
}
.brand__mark::after {
  content: ""; position: absolute; inset: 6px;
  border: 1px solid rgba(111, 182, 201, .32); border-radius: 2px;
}
.brand__text { display: block; }
.brand__name {
  display: block; font-family: var(--font-head); font-weight: 800;
  font-size: 1.15rem; letter-spacing: .04em; line-height: 1.15;
}
.brand__sub { display: block; font-size: .6875rem; letter-spacing: .18em; text-transform: uppercase; color: var(--orbit); }
.masthead__note { max-width: 34ch; font-size: .875rem; color: var(--orbit); line-height: 1.6; }

.nav-toggle {
  display: none; align-items: center; gap: .55rem; margin-left: auto;
  padding: .5rem .7rem; border: 1px solid var(--hairline); border-radius: var(--radius);
  background: rgba(19, 30, 51, .8); color: var(--silver); cursor: pointer;
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .12em;
  transition: border-color var(--seek) ease, color var(--seek) ease;
}
.nav-toggle:hover { border-color: rgba(255, 122, 26, .5); color: var(--signal-soft); }
.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars span {
  display: block; height: 2px; border-radius: 2px; background: currentColor;
  transition: transform var(--seek) ease, opacity var(--seek) ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.sitenav {
  border-top: 1px solid var(--hairline-soft);
  background: rgba(7, 11, 20, .8);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
}
.sitenav__inner { display: flex; align-items: center; gap: 1rem; min-height: 3.25rem; }
.nav-list { display: flex; flex-wrap: wrap; align-items: center; gap: .15rem; flex: 1 1 auto; }
.nav-link {
  position: relative; display: inline-block; padding: .55rem .8rem;
  border-radius: var(--radius); color: #A9B7CA; font-size: .9375rem; text-decoration: none;
  transition: color var(--seek) ease, background var(--seek) ease;
}
.nav-link::after {
  content: ""; position: absolute; left: .8rem; right: .8rem; bottom: .28rem; height: 2px;
  background: var(--signal); transform: scaleX(0); transform-origin: left;
  transition: transform var(--seek) ease;
}
.nav-link:hover { color: var(--silver); background: rgba(215, 226, 240, .05); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: #fff; background: rgba(255, 122, 26, .1); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.sitenav__cta { flex: 0 0 auto; font-size: .875rem; padding: .55rem .95rem; }

.scrollrail {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 90;
  background: rgba(138, 153, 173, .14); pointer-events: none;
}
.scrollrail__bar { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--mist), var(--signal)); }

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative; z-index: 1; margin-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(14, 22, 40, .88), rgba(7, 11, 20, .98));
}
.site-footer::before {
  content: ""; position: absolute; top: -1px; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(255, 122, 26, .7), rgba(111, 182, 201, .6), transparent);
}
.footer__grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-block: clamp(2.25rem, 5vw, 3.5rem) clamp(1.5rem, 3vw, 2.25rem);
}
.footer__brand { max-width: 34ch; }
.footer__logo { font-family: var(--font-head); font-weight: 800; font-size: 1.2rem; letter-spacing: .04em; color: var(--silver); }
.footer__lede { margin-top: .6rem; font-size: .9375rem; line-height: 1.75; color: var(--orbit); }
.footer__season { margin-top: .85rem; font-size: .75rem; letter-spacing: .18em; color: var(--mist); }
.footer__title {
  font-family: var(--font-mono); font-weight: 600; font-size: .75rem;
  letter-spacing: .18em; text-transform: uppercase; color: var(--mist);
  margin-bottom: .85rem;
}
.footer__list li { margin-block: .35rem; }
.footer__list a { color: var(--orbit); font-size: .9375rem; text-decoration: none; }
.footer__list a:hover { color: var(--silver); text-decoration: underline; }
.footer__list--contact li { margin-block: .5rem; }
.copy-row { display: flex; align-items: center; flex-wrap: wrap; gap: .5rem; }
.copy-value { font-size: .8125rem; color: #B9C7DA; word-break: break-all; }
.copy-btn {
  flex: 0 0 auto; padding: .2rem .45rem;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  background: transparent; color: var(--orbit); cursor: pointer;
  font-family: var(--font-mono); font-size: .6875rem; letter-spacing: .1em;
  transition: color var(--seek) ease, border-color var(--seek) ease;
}
.copy-btn:hover { color: var(--signal-soft); border-color: rgba(255, 122, 26, .5); }
.copy-btn[data-copied] { color: var(--ok); border-color: rgba(126, 214, 165, .45); }
.footer__addr { font-size: .875rem; line-height: 1.7; color: var(--orbit); }
.footer__hours { font-size: .75rem; letter-spacing: .08em; color: var(--ok); }
.footer__bottom {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: .5rem 1.5rem; padding-block: 1.15rem 2.25rem;
  border-top: 1px solid var(--hairline-soft);
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .06em; color: var(--orbit);
}
.footer__legal { max-width: none; }
.footer__legal a { color: var(--orbit); text-decoration: none; }
.footer__legal a:hover { color: var(--silver); }

/* ---------- 14. 滚动显现与返回顶部 ---------- */
html[data-reveal-ready] [data-reveal] {
  opacity: 0; transform: translateY(16px);
  transition: opacity .6s cubic-bezier(.22, .7, .3, 1), transform .6s cubic-bezier(.22, .7, .3, 1);
  transition-delay: var(--reveal-delay, 0ms);
}
html[data-reveal-ready] [data-reveal].is-in { opacity: 1; transform: none; }

.to-top {
  position: fixed; right: clamp(.75rem, 3vw, 1.75rem); bottom: clamp(.75rem, 3vw, 1.75rem); z-index: 70;
  width: 2.6rem; height: 2.6rem; display: grid; place-items: center;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  background: rgba(19, 30, 51, .93); color: var(--silver);
  font-family: var(--font-mono); font-size: 1rem; cursor: pointer;
  opacity: 0; transform: translateY(10px); pointer-events: none;
  transition: opacity .25s ease, transform .25s ease, border-color var(--seek) ease, color var(--seek) ease;
}
.to-top[data-visible] { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { border-color: rgba(255, 122, 26, .55); color: var(--signal-soft); }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer__contact { grid-column: span 3; }
}
@media (max-width: 980px) {
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }
}
@media (max-width: 900px) {
  .masthead__note { display: none; }
  .nav-toggle { display: inline-flex; }
  .sitenav {
    max-height: 0; overflow: hidden; visibility: hidden;
    transition: max-height .34s ease, visibility .34s ease;
  }
  .sitenav[data-open] { max-height: 34rem; visibility: visible; }
  .sitenav__inner { display: block; padding-block: .35rem 1.1rem; }
  .nav-list { display: block; }
  .nav-link {
    display: block; padding: .75rem .3rem; border-radius: 0;
    border-bottom: 1px solid var(--hairline-soft);
  }
  .nav-link::after { left: .3rem; right: .3rem; bottom: .35rem; }
  .sitenav__cta { width: 100%; margin-top: .9rem; }
  .skybar__status { margin-left: 0; }
}
@media (max-width: 760px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__contact { grid-column: span 2; }
  .media-frame { aspect-ratio: 4 / 3; }
}
@media (max-width: 560px) {
  .footer__grid { grid-template-columns: 1fr; }
  .footer__contact { grid-column: span 1; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .skybar__brand { letter-spacing: .1em; }
  .brand__sub { display: none; }
}

/* ---------- 16. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html[data-reveal-ready] [data-reveal] { opacity: 1; transform: none; }
  .pulse { animation: none; }
  .to-top { transform: none; }
}

/* ---------- 17. 打印 ---------- */
@media print {
  body { background: #fff; color: #111; }
  body::before, .scrollrail, .to-top, .nav-toggle { display: none !important; }
  .site-header, .site-footer { background: none; }
}