/* =========================================================
   FB赛场 · /assets/site.css
   共享层：reset / 设计变量 / 中文排版 / 框架式页头 / 页脚 / 通用组件
   ========================================================= */

/* ---------- 1. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, 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 { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }
summary { display: block; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --c-ink: #12151A;
  --c-slate: #232830;
  --c-line: #3C444E;
  --c-fog: #8B939C;
  --c-paper: #F1EDE4;
  --c-moss: #5E7F63;
  --c-moss-soft: #A3B79A;
  --c-clay: #D2764B;
  --c-gold: #A98B52;
  --c-mineral: #3E8C82;
  --c-char: #0A0C0F;

  --rail-w: 270px;
  --top-h: 58px;

  --r-xl: 28px;
  --r-lg: 22px;
  --r-md: 16px;
  --r-sm: 10px;
  --r-pill: 999px;

  --gap: clamp(16px, 2vw, 24px);
  --ease: 0.2s cubic-bezier(0.4, 0, 0.2, 1);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

/* ---------- 3. 基础排版（中文长文） ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  padding-top: var(--top-h);
  background-color: var(--c-ink);
  background-image:
    radial-gradient(1100px 520px at 88% -10%, rgba(62, 140, 130, 0.16), transparent 70%),
    radial-gradient(780px 440px at -8% 94%, rgba(210, 118, 75, 0.12), transparent 72%);
  color: var(--c-paper);
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-weight: 900; line-height: 1.18; letter-spacing: -0.02em; }
h1 { font-size: clamp(38px, 7vw, 88px); }
h2 { font-size: clamp(26px, 3.6vw, 44px); }
h3 { font-size: clamp(19px, 2vw, 26px); font-weight: 700; }
p { max-width: 62ch; }
strong, b { font-weight: 800; }
::selection { background: var(--c-clay); color: var(--c-char); }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

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

/* ---------- 4. 布局通用件 ---------- */
.wrap {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 64px);
}

.section { padding-block: clamp(48px, 7vw, 110px); }
.section--tight { padding-block: clamp(32px, 4vw, 64px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 32px;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: clamp(24px, 3vw, 44px);
}
.section-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 56px);
  line-height: 1;
  color: var(--c-line);
  letter-spacing: 0.02em;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-moss-soft);
}
.lede {
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.75;
  color: var(--c-fog);
  max-width: 62ch;
}
.hr { border: 0; border-top: 1px solid var(--c-line); margin-block: clamp(28px, 4vw, 56px); }

.grid { display: grid; gap: var(--gap); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.bento { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gap); }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.tilt { transform: rotate(-1.5deg); }
.tilt--right { transform: rotate(1.5deg); }

/* ---------- 5. 按钮与链接 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease), transform var(--ease);
}
.btn--solid { background: var(--c-clay); border-color: var(--c-clay); color: #17120F; }
.btn--solid:hover { background: #E08A60; border-color: #E08A60; transform: translateY(-2px); }
.btn--ghost { background: transparent; border-color: var(--c-line); color: var(--c-paper); }
.btn--ghost:hover { border-color: var(--c-moss-soft); color: var(--c-moss-soft); transform: translateY(-2px); }
.btn--block { width: 100%; }

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--c-line);
  font-size: 14px;
  font-weight: 700;
  color: var(--c-paper);
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), transform var(--ease);
}
.link-more:hover { color: var(--c-clay); border-bottom-color: var(--c-clay); transform: translateX(2px); }

/* ---------- 6. 卡片 / 数据 / 标签 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.6vw, 34px);
  background: var(--c-slate);
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  transition: transform var(--ease), border-color var(--ease), background-color var(--ease);
}
.card:hover { transform: translateY(-2px); border-color: var(--c-moss); }
.card--clay:hover { border-color: var(--c-clay); }
.card--gold:hover { border-color: var(--c-gold); }
.card--mineral:hover { border-color: var(--c-mineral); }
.card--paper { background: var(--c-paper); color: var(--c-ink); border-color: var(--c-paper); }
.card__title { font-size: 20px; font-weight: 800; letter-spacing: -0.01em; line-height: 1.35; }
.card__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-fog);
}

.stat {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.4vw, 60px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-moss-soft);
}
.stat--clay { color: var(--c-clay); }
.stat--gold { color: var(--c-gold); }
.stat__unit { margin-left: 0.3em; font-size: 0.42em; letter-spacing: 0.08em; color: var(--c-fog); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-fog);
}
.tag--moss { color: var(--c-moss-soft); border-color: rgba(94, 127, 99, 0.6); }
.tag--clay { color: var(--c-clay); border-color: rgba(210, 118, 75, 0.55); }
.tag--gold { color: var(--c-gold); border-color: rgba(169, 139, 82, 0.55); }

/* ---------- 7. 图片容器（供页面阶段放图） ---------- */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--c-line);
  border-radius: var(--r-lg);
  background: linear-gradient(135deg, rgba(62, 140, 130, 0.16), rgba(35, 40, 48, 0.92) 46%, rgba(210, 118, 75, 0.14));
}
.media > img { width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-paper);
  background: linear-gradient(transparent, rgba(10, 12, 15, 0.84));
}
.media__badge {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  background: rgba(10, 12, 15, 0.72);
  border: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-moss-soft);
}

/* ---------- 8. 面包屑 / 正文 / 折叠面板 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-fog);
}
.breadcrumb a { color: var(--c-fog); text-decoration: none; border-bottom: 1px solid transparent; transition: color var(--ease), border-color var(--ease); }
.breadcrumb a:hover { color: var(--c-paper); border-bottom-color: var(--c-clay); }
.breadcrumb__sep { color: var(--c-line); }
.breadcrumb__current { color: var(--c-moss-soft); }

.prose { max-width: 62ch; }
.prose p { margin-bottom: 1.1em; color: #DAD5CB; }
.prose h2 { margin-top: 2.2em; margin-bottom: 0.6em; }
.prose h3 { margin-top: 1.8em; margin-bottom: 0.5em; }
.prose ul, .prose ol { margin-bottom: 1.2em; padding-left: 1.35em; color: #DAD5CB; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.45em; }
.prose a { color: var(--c-moss-soft); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--c-line); }
.prose a:hover { color: var(--c-clay); text-decoration-color: var(--c-clay); }

.fold {
  overflow: hidden;
  background: var(--c-slate);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
}
.fold + .fold { margin-top: 12px; }
.fold__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color var(--ease), color var(--ease);
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__summary::after { content: "＋"; font-family: var(--font-mono); color: var(--c-fog); }
.fold[open] .fold__summary::after { content: "－"; color: var(--c-clay); }
.fold__summary:hover { background: rgba(62, 140, 130, 0.08); color: var(--c-moss-soft); }
.fold[open] .fold__summary { border-bottom: 1px solid var(--c-line); }
.fold__body { padding: 18px 22px 22px; font-size: 15.5px; color: var(--c-fog); }

/* ---------- 9. 框架式页头 ---------- */
.site-frame { --frame-accent: var(--c-moss); }

.skip-link {
  position: fixed;
  top: 10px;
  left: calc(var(--rail-w) + 16px);
  z-index: 120;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--c-paper);
  color: var(--c-ink);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform var(--ease);
}
.skip-link:focus-visible { transform: translateY(0); }

/* 左侧竖栏 */
.site-frame__rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 90;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  gap: 26px;
  padding: 26px 22px 24px;
  background: var(--c-char);
  border-right: 1px solid var(--c-line);
  overflow-y: auto;
}
.rail-brand { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 12px; text-decoration: none; }
.rail-brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(150deg, var(--c-moss), var(--c-mineral));
  color: var(--c-char);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
}
.rail-brand__name { font-size: 23px; font-weight: 900; font-style: italic; letter-spacing: -0.02em; line-height: 1; color: var(--c-paper); }
.rail-brand__meta { grid-column: 1 / -1; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--c-fog); }

.rail-nav { flex: 1 1 auto; }
.rail-nav__list { display: flex; flex-direction: column; gap: 2px; }
.rail-nav__link {
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--r-sm);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-fog);
  text-decoration: none;
  transition: color var(--ease), background-color var(--ease), border-color var(--ease), transform var(--ease);
}
.rail-nav__link:hover { color: var(--c-paper); background: var(--c-slate); border-left-color: var(--c-clay); transform: translateX(2px); }
.rail-nav__link[aria-current="page"] { color: var(--c-paper); background: var(--c-slate); border-left-color: var(--c-moss); }
.rail-nav__num { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; color: var(--c-line); }
.rail-nav__link:hover .rail-nav__num,
.rail-nav__link[aria-current="page"] .rail-nav__num { color: var(--c-gold); }
.rail-nav__label { white-space: nowrap; }

.rail-actions { display: flex; flex-direction: column; gap: 10px; }
.rail-note {
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--c-fog);
}

/* 顶部细横栏 */
.site-frame__top {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  z-index: 80;
  height: var(--top-h);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
  padding-inline: clamp(16px, 2.4vw, 32px);
  background: rgba(10, 12, 15, 0.9);
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}
.top-rail__brand {
  display: none;
  font-size: 17px;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.02em;
  color: var(--c-paper);
  text-decoration: none;
  white-space: nowrap;
}
.top-rail__lead {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-paper);
  text-decoration: none;
  transition: color var(--ease);
}
.top-rail__lead:hover { color: var(--c-clay); }
.top-rail__lead-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-clay);
  box-shadow: 0 0 0 4px rgba(210, 118, 75, 0.18);
}

.tagflow {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 48px, #000 calc(100% - 48px), transparent);
  mask-image: linear-gradient(90deg, transparent, #000 48px, #000 calc(100% - 48px), transparent);
}
.tagflow__track { display: flex; width: max-content; animation: tagflow-drift 52s linear infinite; }
.tagflow__group { display: flex; gap: 10px; padding-right: 10px; }
.tagflow__item {
  padding: 5px 13px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-fog);
  white-space: nowrap;
}
.tagflow__item--hot { color: var(--c-clay); border-color: rgba(210, 118, 75, 0.5); }
@keyframes tagflow-drift {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.scroll-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; pointer-events: none; }
.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-moss), var(--c-mineral) 55%, var(--c-clay));
}

/* 移动端菜单按钮与遮罩 */
.nav-toggle {
  display: none;
  position: fixed;
  top: 11px;
  right: 14px;
  z-index: 100;
  align-items: center;
  gap: 9px;
  height: 36px;
  padding-inline: 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  background: rgba(35, 40, 48, 0.92);
  color: var(--c-paper);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color var(--ease), color var(--ease);
}
.nav-toggle:hover { border-color: var(--c-clay); color: var(--c-clay); }
.nav-toggle__bars { position: relative; width: 16px; height: 2px; background: currentColor; transition: background-color var(--ease); }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.site-frame[data-open] .nav-toggle__bars { background: transparent; }
.site-frame[data-open] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.site-frame[data-open] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.frame-scrim {
  position: fixed;
  inset: 0;
  z-index: 85;
  background: rgba(10, 12, 15, 0.68);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--ease), visibility var(--ease);
}
.site-frame[data-open] .frame-scrim { opacity: 1; visibility: visible; }

/* ---------- 10. 页脚 ---------- */
.site-footer {
  margin-top: clamp(72px, 10vw, 140px);
  padding-block: clamp(48px, 6vw, 80px) 28px;
  background: var(--c-char);
  border-top: 1px solid var(--c-line);
  color: var(--c-fog);
  font-size: 15px;
}
.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 2fr;
  gap: clamp(28px, 4vw, 56px);
}
.site-footer__brand { display: flex; flex-direction: column; }
.footer-brand__name {
  display: inline-block;
  align-self: flex-start;
  font-size: 28px;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.02em;
  color: var(--c-paper);
  text-decoration: none;
}
.footer-brand__meta { margin-top: 10px; font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.12em; color: var(--c-fog); }
.footer-brand__note {
  margin-top: 18px;
  padding-left: 14px;
  border-left: 2px solid var(--c-moss);
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-moss-soft);
  max-width: 34ch;
}

.footer-index { display: grid; grid-template-columns: repeat(3, minmax(140px, 1fr)); gap: clamp(20px, 3vw, 40px); }
.footer-col__title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-paper);
}
.footer-col__num { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; color: var(--c-gold); }
.footer-col__list { display: grid; gap: 10px; }
.footer-col__list a {
  display: inline-block;
  font-size: 15px;
  color: var(--c-fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease), transform var(--ease);
}
.footer-col__list a:hover { color: var(--c-paper); border-bottom-color: var(--c-clay); transform: translateX(2px); }

.site-footer__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 30px;
  margin-top: clamp(36px, 5vw, 64px);
  padding-top: 26px;
  border-top: 1px solid var(--c-line);
}
.contact-item { display: inline-flex; align-items: center; gap: 10px; max-width: none; }
.contact-item__key { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; color: var(--c-fog); }
.contact-item__val { font-family: var(--font-mono); font-size: 13.5px; letter-spacing: 0.04em; color: var(--c-paper); }
.copy-btn {
  padding: 3px 12px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  font-size: 11.5px;
  color: var(--c-fog);
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease);
}
.copy-btn:hover { border-color: var(--c-mineral); color: var(--c-mineral); }
.copy-btn[data-copied] { border-color: var(--c-moss); color: var(--c-moss-soft); }
.contact-note { flex: 1 1 280px; font-size: 13.5px; line-height: 1.7; color: var(--c-fog); }

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px dashed var(--c-line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-fog);
}
.site-footer__legal a { color: var(--c-fog); text-decoration: none; border-bottom: 1px solid var(--c-line); transition: color var(--ease), border-color var(--ease); }
.site-footer__legal a:hover { color: var(--c-paper); border-bottom-color: var(--c-clay); }
.site-footer__copy { margin-left: auto; }

/* ---------- 11. 响应式 ---------- */
@media (min-width: 1024px) and (max-width: 1240px) {
  :root { --rail-w: 232px; }
}

@media (max-width: 1023px) {
  body { padding-left: 0; }
  .skip-link { left: 16px; }
  .site-frame__top { left: 0; padding-right: 100px; }
  .top-rail__brand { display: inline-block; }
  .nav-toggle { display: inline-flex; }
  .site-frame__rail {
    width: min(84vw, 320px);
    padding-top: 22px;
    transform: translateX(-102%);
    box-shadow: 24px 0 60px rgba(0, 0, 0, 0.5);
    transition: transform 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .site-frame[data-open] .site-frame__rail { transform: translateX(0); }
  body.is-nav-open { overflow: hidden; }

  .grid--12, .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3 { grid-column: span 3; }
  .col-4, .col-6, .col-8 { grid-column: span 6; }
  .col-12 { grid-column: span 6; }

  .site-footer__inner { grid-template-columns: 1fr; }
}

@media (max-width: 639px) {
  body { font-size: 16px; line-height: 1.75; }
  .grid--12, .bento { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-3, .col-4, .col-6, .col-8, .col-12 { grid-column: span 2; }
  .tilt, .tilt--right { transform: none; }

  .footer-index { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__contact { gap: 12px 18px; }
  .contact-item { flex-wrap: wrap; }
  .site-footer__copy { margin-left: 0; }
  .tagflow { display: none; }
}

/* ---------- 12. 动效降级 ---------- */
@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;
  }
  .tagflow__track { animation: none; }
  .card:hover, .btn:hover, .link-more:hover, .rail-nav__link:hover { transform: none; }
}