/* ============================================================
   五楼体育 FIVE SPORTS — /assets/site.css
   共享外壳：重置 · 变量 · 中文排版 · 头部 · 页脚 · 基础组件
   ============================================================ */

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

/* ---------- 1. 变量 ---------- */
:root {
  /* 品牌色 */
  --ink:        #0B2B26;   /* 深墨绿 主场底 */
  --carbon:     #121417;   /* 炭黑 结构层 */
  --panel:      #14453B;   /* 墨绿中调 面板 */
  --cyan:       #35F0D0;   /* 荧光青 数据亮色 */
  --orange:     #FF6A2B;   /* 信号橙 行动色 */
  --warm:       #F4F1E9;   /* 暖白 阅读区 */
  --carbon-ink: #23282A;   /* 正文墨 */
  --graphite:   #6B7671;   /* 石墨灰 次级 */
  --indigo:     #2A2A55;   /* 靛紫 专题分区 */
  --claret:     #6E2233;   /* 酒红 标签底 */

  --line:        rgba(244, 241, 233, .14);
  --line-strong: rgba(244, 241, 233, .28);

  --shadow-1: 0 4px 14px rgba(0, 0, 0, .32);
  --shadow-2: 0 8px 26px rgba(0, 0, 0, .44);

  --r-card: 12px;
  --r-pill: 999px;

  --maxw: 1240px;
  --gutter: clamp(16px, 3.4vw, 44px);

  /* 字体族（全部本地回退，不加载远程字体） */
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", Georgia, serif;
  --sans:  "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --cond:  "Roboto Condensed", "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono:  "JetBrains Mono", "Roboto Mono", ui-monospace, "SFMono-Regular", "Courier New", monospace;
  --ease:  cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 2. 基础排版（中文优先） ---------- */
body {
  background-color: var(--ink);
  background-image:
    radial-gradient(920px 520px at 10% -6%, rgba(53, 240, 208, .10), transparent 64%),
    radial-gradient(760px 480px at 94% 2%, rgba(255, 106, 43, .085), transparent 60%),
    radial-gradient(1300px 820px at 50% 106%, rgba(42, 42, 85, .34), transparent 72%);
  background-repeat: no-repeat;
  color: var(--warm);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: .005em;
  color: var(--warm);
}
h1 { font-size: clamp(34px, 5.2vw, 60px); letter-spacing: -.012em; }
h2 { font-size: clamp(26px, 3.3vw, 40px); }
h3 { font-size: clamp(20px, 2.2vw, 26px); font-weight: 700; }
h4 { font-size: clamp(17px, 1.6vw, 20px); font-weight: 700; }

p { margin-bottom: 1.1em; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--cyan);
  text-decoration: none;
}
a:hover { text-decoration: underline; text-underline-offset: 3px; }

strong, b { font-weight: 700; }
small { font-size: .84em; }
hr { border: 0; }

::selection { background: var(--cyan); color: #06231F; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* 双语文本层：只换文字，不动栅格 */
.t-en { display: none; }
[data-lang="en"] .t-en { display: inline; }
[data-lang="en"] .t-zh { display: none; }

.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;
}

/* ---------- 3. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 200;
  transform: translate(-50%, -260%);
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: #06231F;
  font-family: var(--cond);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  text-decoration: none;
  box-shadow: var(--shadow-2);
  transition: transform .22s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); text-decoration: none; }

/* ---------- 4. 头部：悬浮胶囊导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  padding: 14px var(--gutter) 18px;
  background: linear-gradient(180deg,
      rgba(11, 43, 38, .985) 0%,
      rgba(11, 43, 38, .92) 52%,
      rgba(11, 43, 38, 0) 100%);
  transition: padding .3s var(--ease);
}
.site-header[data-shrunk="true"] { padding-top: 6px; padding-bottom: 12px; }

.header-shell {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 9px 12px 9px 16px;
  background: rgba(11, 43, 38, .88);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-1);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  transition: padding .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
}
.site-header[data-shrunk="true"] .header-shell {
  padding: 5px 12px 5px 14px;
  background: rgba(18, 20, 23, .94);
  border-color: var(--line-strong);
}

/* 品牌字标 */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: inherit;
  text-decoration: none;
}
.brand-lockup:hover { text-decoration: none; }

.brand-glyph {
  position: relative;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid rgba(53, 240, 208, .55);
  border-radius: 11px;
  background: linear-gradient(155deg, rgba(53, 240, 208, .18), rgba(53, 240, 208, 0));
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0;
}
.brand-glyph::after {
  content: "";
  position: absolute;
  top: -3px;
  right: -3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 2px var(--ink);
}

.brand-words {
  display: flex;
  flex-direction: column;
  gap: 3px;
  line-height: 1;
}
.brand-name {
  font-family: var(--serif);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .07em;
  color: var(--warm);
}
.brand-latin {
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(53, 240, 208, .82);
}

/* 导航胶囊 */
.nav-capsule { min-width: 0; }
.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex-wrap: nowrap;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  color: rgba(244, 241, 233, .76);
  font-family: var(--cond);
  font-size: 14.5px;
  letter-spacing: .03em;
  white-space: nowrap;
  text-decoration: none;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible {
  color: var(--warm);
  background: rgba(53, 240, 208, .1);
  border-color: rgba(53, 240, 208, .26);
  text-decoration: none;
}
.nav-link[aria-current="page"] {
  color: #06231F;
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}
.nav-link[aria-current="page"]:hover { background: #5CF7DE; }

/* 行动区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.pill-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid rgba(255, 106, 43, .55);
  border-radius: var(--r-pill);
  background: var(--orange);
  color: #14100D;
  font-family: var(--cond);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  white-space: nowrap;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(255, 106, 43, .22);
  transition: transform .2s var(--ease), background .2s var(--ease);
}
.pill-cta:hover { background: #FF8348; transform: translateY(-1px); text-decoration: none; }
.pill-cta-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: #14100D;
  animation: ctaPulse 2.6s ease-in-out infinite;
}
@keyframes ctaPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: .4; transform: scale(.78); }
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(18, 20, 23, .58);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
}
.lang-opt {
  padding: 5px 9px;
  border-radius: var(--r-pill);
  color: rgba(244, 241, 233, .6);
  transition: background .2s var(--ease), color .2s var(--ease);
}
.lang-switch[aria-pressed="false"] .lang-opt--zh,
.lang-switch[aria-pressed="true"]  .lang-opt--en {
  background: var(--cyan);
  color: #06231F;
  font-weight: 700;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 13px 8px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(18, 20, 23, .58);
  color: var(--warm);
  font-family: var(--cond);
  font-size: 13px;
  letter-spacing: .08em;
}
.nav-toggle-bars { display: grid; gap: 3.5px; width: 16px; }
.nav-toggle-bars span {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .24s var(--ease), opacity .24s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) 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(-5px) rotate(-45deg); }

/* 轮次进度刻度 */
.scroll-meter {
  position: absolute;
  left: 34px;
  right: 34px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: rgba(244, 241, 233, .1);
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s var(--ease);
}
.site-header[data-shrunk="true"] .scroll-meter { opacity: 1; }
.scroll-meter-fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 104px);
  background: var(--carbon);
  border-top: 1px solid var(--line);
  color: rgba(244, 241, 233, .74);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 52%, rgba(255, 106, 43, 0));
  opacity: .8;
}

.footer-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(38px, 5.5vw, 72px) var(--gutter) clamp(28px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, .85fr) minmax(0, 1.1fr);
  gap: clamp(28px, 4vw, 58px);
}

.footer-sign { display: flex; flex-direction: column; align-items: flex-start; gap: 16px; }
.brand-lockup--footer .brand-name { font-size: 20px; }

.footer-tagline {
  margin: 0;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 241, 233, .62);
}
.footer-cadence {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  padding: 6px 14px;
  border: 1px solid rgba(53, 240, 208, .28);
  border-radius: var(--r-pill);
  background: rgba(53, 240, 208, .07);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .1em;
}
.cadence-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 240, 208, .16);
}

.footer-head {
  margin-bottom: 16px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-list { display: flex; flex-direction: column; }
.footer-list a {
  display: inline-block;
  padding: 5px 0;
  color: rgba(244, 241, 233, .72);
  font-size: 14.5px;
  border-bottom: 1px solid transparent;
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.footer-list a:hover {
  color: var(--cyan);
  border-bottom-color: rgba(53, 240, 208, .42);
  text-decoration: none;
}

.footer-contact li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(244, 241, 233, .1);
}
.footer-contact li:last-child { border-bottom: 0; }
.footer-contact .k {
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--graphite);
}
.footer-contact .v {
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(244, 241, 233, .88);
  word-break: break-word;
}
.footer-contact .v--mono {
  font-family: var(--mono);
  font-size: 13.5px;
  letter-spacing: .01em;
  color: var(--warm);
}

.footer-base {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--gutter) 30px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--graphite);
}
.footer-base p { margin: 0; }
.footer-icp { color: rgba(244, 241, 233, .5); }

/* ---------- 6. 布局与容器 ---------- */
#main-content { display: block; scroll-margin-top: 96px; }
.main-content { display: block; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--tight { max-width: 760px; }
.wrap--mid { max-width: 980px; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(18px, 2.2vw, 30px);
}
.span-3  { grid-column: span 3; }
.span-4  { grid-column: span 4; }
.span-5  { grid-column: span 5; }
.span-6  { grid-column: span 6; }
.span-7  { grid-column: span 7; }
.span-8  { grid-column: span 8; }
.span-9  { grid-column: span 9; }
.span-10 { grid-column: span 10; }
.span-12 { grid-column: span 12; }

.stack { display: block; }
.stack > * + * { margin-top: var(--stack-gap, 18px); }

/* ---------- 7. 文字元素 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 1px;
  background: currentColor;
  opacity: .75;
}

.lede {
  max-width: 68ch;
  font-size: clamp(16px, 1.3vw, 19px);
  line-height: 1.85;
  color: rgba(244, 241, 233, .78);
}

.data-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
  margin: clamp(28px, 4vw, 48px) 0;
}

/* ---------- 8. 分区背景 ---------- */
.zone { position: relative; }
.zone--carbon { background: var(--carbon); }
.zone--indigo { background: linear-gradient(158deg, #23234A 0%, var(--indigo) 100%); }
.zone--warm { background: var(--warm); color: var(--carbon-ink); }
.zone--warm h1,
.zone--warm h2,
.zone--warm h3,
.zone--warm h4 { color: var(--carbon-ink); }
.zone--warm .lede { color: rgba(35, 40, 42, .78); }
.zone--warm .eyebrow { color: #0E7F6C; }
.zone--warm .rule { background: rgba(35, 40, 42, .16); }
.zone--warm .data-num { color: #0E7F6C; }

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--cond);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .04em;
  text-decoration: none;
  transition: transform .2s var(--ease), background .2s var(--ease),
              border-color .2s var(--ease), color .2s var(--ease);
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }

.btn--primary {
  background: var(--orange);
  color: #14100D;
  border-color: rgba(255, 106, 43, .5);
  box-shadow: 0 4px 16px rgba(255, 106, 43, .2);
}
.btn--primary:hover { background: #FF8348; }

.btn--cyan { background: var(--cyan); color: #06231F; }
.btn--cyan:hover { background: #5CF7DE; }

.btn--ghost {
  background: transparent;
  color: var(--warm);
  border-color: var(--line-strong);
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn--quiet {
  padding: 8px 15px;
  font-size: 13.5px;
  background: rgba(244, 241, 233, .06);
  color: rgba(244, 241, 233, .86);
  border-color: var(--line);
}
.btn--quiet:hover { border-color: var(--line-strong); color: var(--warm); }

/* ---------- 10. 卡片与面板 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: rgba(18, 20, 23, .74);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-1);
  transition: transform .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: rgba(53, 240, 208, .32);
  box-shadow: var(--shadow-2);
}
.card--flush { padding: 0; overflow: hidden; }
.card--indigo {
  background: linear-gradient(155deg, #23234A, var(--indigo));
  border-color: rgba(244, 241, 233, .14);
}
.card--warm {
  background: var(--warm);
  color: var(--carbon-ink);
  border-color: rgba(35, 40, 42, .16);
}
.card--warm h1,
.card--warm h2,
.card--warm h3,
.card--warm h4 { color: var(--carbon-ink); }
.card--warm .lede { color: rgba(35, 40, 42, .78); }

.panel {
  padding: clamp(22px, 3vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
}
.panel--panel { background: var(--panel); }
.panel--indigo { background: linear-gradient(150deg, var(--indigo), #1D1D40); }
.panel--claret { background: linear-gradient(150deg, var(--claret), #4E1524); }
.panel--warm {
  background: var(--warm);
  color: var(--carbon-ink);
  border-color: rgba(35, 40, 42, .16);
}
.panel--warm h1,
.panel--warm h2,
.panel--warm h3,
.panel--warm h4 { color: var(--carbon-ink); }
.panel--warm .lede { color: rgba(35, 40, 42, .78); }

/* ---------- 11. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid rgba(244, 241, 233, .16);
  border-radius: 5px;
  background: var(--claret);
  color: var(--warm);
  font-family: var(--cond);
  font-size: 12px;
  letter-spacing: .06em;
}
.tag--cyan {
  background: rgba(53, 240, 208, .13);
  color: var(--cyan);
  border-color: rgba(53, 240, 208, .36);
}
.tag--orange {
  background: rgba(255, 106, 43, .16);
  color: #FFA477;
  border-color: rgba(255, 106, 43, .42);
}
.tag--ghost {
  background: transparent;
  color: rgba(244, 241, 233, .72);
  border-color: var(--line-strong);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--graphite);
}
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: rgba(107, 118, 113, .65); }
.breadcrumb a { color: rgba(244, 241, 233, .7); text-decoration: none; }
.breadcrumb a:hover { color: var(--cyan); text-decoration: none; }
.breadcrumb [aria-current="page"] { color: var(--cyan); }
.zone--warm .breadcrumb,
.card--warm .breadcrumb { color: rgba(35, 40, 42, .55); }
.zone--warm .breadcrumb a,
.card--warm .breadcrumb a { color: rgba(35, 40, 42, .68); }
.zone--warm .breadcrumb [aria-current="page"],
.card--warm .breadcrumb [aria-current="page"] { color: #0E7F6C; }

/* ---------- 13. 图片容器基础（供页面阶段放图） ---------- */
.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background:
    linear-gradient(135deg, rgba(53, 240, 208, .12) 0%, rgba(42, 42, 85, .42) 52%, rgba(18, 20, 23, .92) 100%);
  box-shadow: var(--shadow-1);
}
.media-frame > img,
.media-frame > svg,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .55;
  background-image:
    linear-gradient(to right, rgba(244, 241, 233, .08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(244, 241, 233, .08) 1px, transparent 1px);
  background-size: 48px 48px;
}
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall   { aspect-ratio: 4 / 5; }
.media-frame--wide   { aspect-ratio: 21 / 9; }
.media-frame--low > img,
.media-frame--low > svg { object-position: 50% 72%; }

.media-frame__badge {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 1;
  padding: 4px 11px;
  border-radius: 5px;
  background: rgba(18, 20, 23, .82);
  border: 1px solid var(--line-strong);
  color: var(--warm);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
}

/* ---------- 14. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1100px) {
  .nav-link { padding: 8px 10px; font-size: 14px; }
  .footer-grid { grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr) minmax(0, 1.1fr); gap: 32px; }
}

@media (max-width: 940px) {
  .header-shell {
    grid-template-columns: auto auto;
    justify-content: space-between;
    padding: 9px 12px;
  }
  .site-header[data-shrunk="true"] .header-shell { padding: 6px 12px; }

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

  .nav-capsule {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    max-height: min(72vh, 540px);
    overflow-y: auto;
    padding: 10px;
    background: rgba(18, 20, 23, .97);
    border: 1px solid var(--line-strong);
    border-radius: 18px;
    box-shadow: var(--shadow-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s var(--ease);
  }
  .nav-capsule[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 15.5px;
  }
  .scroll-meter { left: 20px; right: 20px; }

  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-meta { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-7, .span-8, .span-9, .span-10 { grid-column: span 6; }
}

@media (max-width: 720px) {
  .pill-cta { display: none; }
  .brand-latin { letter-spacing: .16em; }
}

@media (max-width: 620px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .footer-base { justify-content: flex-start; }
}

@media (max-width: 560px) {
  h1 { font-size: clamp(30px, 8.4vw, 40px); }
  .grid-12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9, .span-10 { grid-column: span 4; }
  .brand-glyph { width: 32px; height: 32px; font-size: 14px; }
  .brand-name { font-size: 15.5px; }
  .footer-contact li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .footer-contact .k { padding-top: 0; }
}

@media (max-width: 400px) {
  .brand-latin { display: none; }
  .nav-toggle-text { 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;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .card:hover,
  .btn:hover,
  .pill-cta:hover { transform: none; }
  .pill-cta-dot { animation: none; }
}