/* ==========================================================================
   乐鱼体育 · 共享外壳样式  /assets/site.css
   夜间球场数据实验室：深海蓝底 + 矿物色分区 + 荧光青/暖橙数据双色
   ========================================================================== */

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

html { -webkit-text-size-adjust: 100%; }

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, fieldset {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --deep: #0A1A2F;
  --deep-1: #0C1F38;
  --deep-2: #0F2743;
  --deep-3: #071322;
  --deep-4: #050D17;

  --cream: #F4F1EA;
  --cream-dim: rgba(244, 241, 234, 0.74);
  --cream-mute: rgba(244, 241, 234, 0.48);

  --rock: #6B6F6A;
  --moss: #2F5D50;
  --clay: #C46A4A;
  --cyan: #00E5C7;
  --orange: #FF6B35;
  --violet: #7C5CFF;
  --ink: #111827;

  --line: rgba(124, 146, 178, 0.18);
  --line-soft: rgba(124, 146, 178, 0.1);
  --line-strong: rgba(0, 229, 199, 0.4);

  --rail-w: 268px;
  --header-h: 68px;
  --shell-max: 1240px;

  --r-sm: 10px;
  --r-md: 18px;
  --r-lg: 28px;
  --r-pill: 999px;

  --font-display: "DIN Condensed", "Oswald", "Noto Sans SC Condensed", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background: var(--deep);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  padding-top: var(--header-h);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0.02em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

main { display: block; }

#main-content { scroll-margin-top: calc(var(--header-h) + 12px); }

::selection { background: var(--cyan); color: #04211D; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* 跳转链接 */
.skip-link {
  position: fixed;
  left: 12px;
  top: -64px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: #04211D;
  font-size: 14px;
  font-weight: 600;
  transition: top 0.22s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 4. 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: 20px;
}

.section { padding: clamp(48px, 7vw, 96px) 0; }

.section--tint {
  background: linear-gradient(180deg, var(--deep-1), var(--deep));
}

.section--cream {
  background: var(--cream);
  color: var(--ink);
}

.section-head {
  max-width: 66ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}

.section-title {
  margin-top: 14px;
  font-size: clamp(28px, 4.6vw, 48px);
}

.lead {
  margin-top: 16px;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.9;
  color: var(--cream-dim);
}

.section--cream .eyebrow { color: var(--moss); }
.section--cream .lead { color: rgba(17, 24, 39, 0.78); }
.section--cream .section-title { color: var(--ink); }

/* 网格 */
.grid { display: grid; gap: clamp(18px, 2.4vw, 28px); }
.grid-2 { display: grid; gap: clamp(18px, 2.4vw, 28px); grid-template-columns: 1fr; }
.grid-3 { display: grid; gap: clamp(18px, 2.4vw, 28px); grid-template-columns: 1fr; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 26px);
}
.grid-12 > * { grid-column: 1 / -1; }

@media (min-width: 768px) {
  .container { padding-inline: 32px; }
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .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-12 { grid-column: span 12; }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1;
  letter-spacing: 0.06em;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.22s var(--ease), color 0.22s var(--ease),
              border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.btn-solid {
  background: var(--cyan);
  color: #04211D;
  font-weight: 600;
}
.btn-solid:hover { background: #3BF0D8; transform: translateY(-1px); }

.btn-outline {
  border-color: rgba(0, 229, 199, 0.45);
  color: var(--cyan);
}
.btn-outline:hover { background: rgba(0, 229, 199, 0.12); border-color: var(--cyan); }

.btn-ghost {
  border-color: var(--line);
  background: rgba(244, 241, 234, 0.03);
  color: var(--cream-dim);
}
.btn-ghost:hover { border-color: rgba(244, 241, 234, 0.35); color: var(--cream); }

.btn-clay { background: var(--clay); color: #1B0E08; font-weight: 600; }
.btn-clay:hover { background: #D57C5B; }

.btn-violet { background: var(--violet); color: #FFFFFF; font-weight: 600; }
.btn-violet:hover { background: #9277FF; }

.btn-sm { padding: 8px 15px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------- 6. 侧边轨道头部（移动端优先） ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  height: var(--header-h);
  padding: 0 16px;
  background: linear-gradient(180deg, #0A1A2F 0%, #081930 100%);
  border-bottom: 1px solid var(--line);
}

.rail-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 4px;
  border-radius: var(--r-md);
}

.brand-mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 14px;
  border: 1px solid rgba(0, 229, 199, 0.35);
  background:
    radial-gradient(circle at 30% 24%, rgba(0, 229, 199, 0.3), rgba(124, 92, 255, 0.2) 62%, rgba(10, 26, 47, 0) 100%),
    linear-gradient(160deg, var(--deep-2), var(--deep));
  color: var(--cyan);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

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

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.12em;
  color: var(--cream);
}

.brand-line {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cyan);
}

.rail-sub {
  display: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cream-mute);
}

/* 抽屉开关 */
.nav-toggle {
  position: relative;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(0, 229, 199, 0.06);
  color: var(--cream);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-toggle:hover {
  border-color: var(--line-strong);
  background: rgba(0, 229, 199, 0.12);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: var(--cyan);
  transition: transform 0.28s var(--ease);
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-4.5px) rotate(-45deg); }

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
}

/* 主导航：移动端抽屉 */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 65;
  display: flex;
  flex-direction: column;
  gap: 18px;
  width: min(84vw, 340px);
  padding: calc(var(--header-h) + 14px) 22px 28px;
  background: linear-gradient(180deg, #0C2038 0%, #07121F 100%);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(-104%);
  transition: transform 0.34s var(--ease);
}
.site-nav[data-open] { transform: translateX(0); }

.nav-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--rock);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-list a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 12px 11px 16px;
  border-radius: var(--r-pill);
  color: var(--cream-dim);
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  border-radius: 2px;
  background: var(--cyan);
  transform: translateY(-50%);
  transition: height 0.24s var(--ease);
}
.nav-list a:hover {
  color: var(--cream);
  background: rgba(244, 241, 234, 0.05);
}
.nav-list a:hover::before,
.nav-list a[aria-current="page"]::before { height: 18px; }

.nav-list a[aria-current="page"] {
  color: var(--cyan);
  background: linear-gradient(90deg, rgba(0, 229, 199, 0.14), rgba(0, 229, 199, 0));
}

.nav-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--rock);
}
.nav-list a[aria-current="page"] .nav-idx { color: var(--violet); }

.nav-label { font-size: 16px; letter-spacing: 0.06em; }

.rail-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.rail-actions .btn { width: 100%; }

.rail-foot {
  display: none;
  align-items: center;
  gap: 9px;
  padding-top: 18px;
}

.rail-pulse {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  animation: rail-pulse 2.6s infinite;
}
@keyframes rail-pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 229, 199, 0.5); }
  70% { box-shadow: 0 0 0 9px rgba(0, 229, 199, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 229, 199, 0); }
}

.rail-note {
  font-family: var(--font-serif);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--rock);
}

/* 遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(3, 9, 17, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s var(--ease);
}
body.nav-open .nav-scrim { opacity: 1; pointer-events: auto; }
body.nav-open { overflow: hidden; }

/* 阅读进度 */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  display: block;
  height: 2px;
  background: rgba(244, 241, 234, 0.06);
  pointer-events: none;
}
.read-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 62%, var(--orange));
  transition: width 0.14s linear;
}

/* 桌面端：侧边轨道 */
@media (min-width: 1024px) {
  body {
    padding-top: 0;
    padding-left: var(--rail-w);
  }

  body.nav-open { overflow: auto; }

  .nav-scrim { display: none; }

  .read-progress { left: var(--rail-w); }

  .site-header {
    right: auto;
    bottom: 0;
    width: var(--rail-w);
    height: auto;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 34px 24px 24px;
    border-bottom: 0;
    border-right: 1px solid var(--line);
    background: linear-gradient(180deg, #0A1A2F 0%, #071322 72%, #050D17 100%);
    overflow-y: auto;
  }

  .rail-brand {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .rail-sub {
    display: block;
    margin-top: 18px;
  }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    flex: 1;
    width: auto;
    padding: 0;
    margin-top: 26px;
    background: none;
    border: 0;
    overflow: visible;
    transform: none;
  }

  .nav-eyebrow { margin-bottom: 14px; }

  .rail-foot { display: flex; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  padding: 64px 0 30px;
  background: linear-gradient(180deg, #081422 0%, #050D17 100%);
  border-top: 1px solid var(--line);
  color: var(--cream-dim);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 1.5fr 0.75fr 0.75fr; gap: 32px; }
}

.footer-brand { min-width: 0; }

.footer-brandline {
  font-family: var(--font-display);
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.25;
  letter-spacing: 0.06em;
  color: var(--cream);
}

.footer-tagline {
  margin-top: 12px;
  max-width: 36ch;
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--rock);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 22px;
}

.contact-row {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14.5px;
}

.contact-label {
  flex: none;
  min-width: 44px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--rock);
}

.contact-value { color: var(--cream-dim); word-break: break-word; }
.contact-value--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.copy-btn { margin-top: 16px; }

.copy-status {
  display: block;
  min-height: 1.2em;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.footer-note {
  margin-top: 14px;
  max-width: 44ch;
  padding-left: 12px;
  border-left: 2px solid rgba(196, 106, 74, 0.6);
  font-size: 13px;
  line-height: 1.8;
  color: var(--rock);
}

.footer-col { min-width: 0; }

.footer-col-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--rock);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--cream-dim);
  transition: color 0.2s var(--ease), transform 0.22s var(--ease);
}
.footer-list a::before {
  content: "";
  width: 12px;
  height: 1px;
  background: var(--line-strong);
  transition: width 0.22s var(--ease), background 0.2s var(--ease);
}
.footer-list a:hover { color: var(--cyan); transform: translateX(3px); }
.footer-list a:hover::before { width: 18px; background: var(--cyan); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 26px;
  margin-top: 52px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--rock);
}

.footer-copy { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.footer-legal a { color: var(--cream-dim); }
.footer-legal a:hover { color: var(--cyan); }

.footer-icp { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; }

/* ---------- 8. 通用组件 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(15, 39, 67, 0.9), rgba(10, 26, 47, 0.72));
}

.panel--cream {
  background: var(--cream);
  color: var(--ink);
  border-color: rgba(17, 24, 39, 0.1);
}

.panel--accent {
  border-color: rgba(0, 229, 199, 0.35);
  box-shadow: 0 0 0 1px rgba(0, 229, 199, 0.08), 0 24px 60px -40px rgba(0, 229, 199, 0.55);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.stat-value--orange { color: var(--orange); }
.stat-value--violet { color: var(--violet); }

.stat-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rock);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cream-dim);
}
.tag--cyan { border-color: rgba(0, 229, 199, 0.4); color: var(--cyan); }
.tag--orange { border-color: rgba(255, 107, 53, 0.45); color: var(--orange); }
.tag--violet { border-color: rgba(124, 92, 255, 0.5); color: #B9A7FF; }
.tag--clay { border-color: rgba(196, 106, 74, 0.5); color: #E2A183; }

.section--cream .tag { color: rgba(17, 24, 39, 0.7); border-color: rgba(17, 24, 39, 0.18); }

.note {
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  font-family: var(--font-serif);
  font-size: 14px;
  line-height: 1.85;
  color: var(--rock);
}
.section--cream .note { color: rgba(17, 24, 39, 0.65); }

.divider {
  height: 1px;
  margin: clamp(32px, 5vw, 56px) 0;
  background: linear-gradient(90deg, var(--line), rgba(0, 229, 199, 0.28), var(--line));
}

.prose {
  max-width: 68ch;
  font-size: 17.5px;
  line-height: 1.95;
  color: var(--cream-dim);
}
.prose p + p { margin-top: 1.1em; }
.prose h2 {
  margin: 1.6em 0 0.6em;
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  color: var(--cream);
}
.prose h3 {
  margin: 1.4em 0 0.5em;
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--cyan);
}
.prose ul {
  display: flex;
  flex-direction: column;
  gap: 0.6em;
  margin: 1em 0;
}
.prose ul li { position: relative; padding-left: 20px; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.76em;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}
.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(0, 229, 199, 0.4);
}
.section--cream .prose { color: rgba(17, 24, 39, 0.8); }
.section--cream .prose h2 { color: var(--ink); }
.section--cream .prose h3 { color: var(--moss); }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--rock);
}
.breadcrumbs li { display: flex; align-items: center; gap: 10px; }
.breadcrumbs li + li::before { content: "/"; opacity: 0.6; }
.breadcrumbs a { color: var(--cream-dim); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--cyan); }

/* ---------- 9. 媒体容器（页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 90% at 14% 8%, rgba(47, 93, 80, 0.55), rgba(10, 26, 47, 0) 62%),
    linear-gradient(150deg, var(--deep-2), var(--deep-3));
  isolation: isolate;
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--3x4 { aspect-ratio: 3 / 4; }
.media-frame--auto { aspect-ratio: auto; min-height: 220px; }

.media-frame--grid::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 229, 199, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 199, 0.09) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rock);
}

/* ---------- 10. 动效与滚动协议 ---------- */
[data-reveal] {
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}
html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

[data-spy] { scroll-margin-top: calc(var(--header-h) + 20px); }
[data-spy].is-current .eyebrow { color: var(--cyan); }

@media (min-width: 1024px) {
  [data-spy] { scroll-margin-top: 24px; }
  [data-spy].is-current .eyebrow::after {
    content: "";
    display: inline-block;
    width: 24px;
    height: 1px;
    margin-left: 10px;
    vertical-align: middle;
    background: var(--cyan);
    opacity: 0.8;
  }
}

/* ---------- 11. 工具类 ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 12. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  html.js [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .read-progress-bar { transition: none; }
  .site-nav { transition: none; }
}