/* ==========================================================================
   安博电竞 · 共享样式表 /assets/site.css
   深空数据舱设计系统：粗边框、硬阴影、青蓝 × 霓虹紫双强调
   ========================================================================== */

/* --- 1. 变量 ------------------------------------------------------------- */
:root {
  --void: #05070F;
  --panel: #0B1224;
  --edge: #16213D;
  --cyan: #22D3EE;
  --violet: #A855F7;
  --amber: #F59E0B;
  --text: #CBD5E1;
  --muted: #7C8AA5;
  --white: #F8FAFC;
  --green: #34D399;

  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Oswald", "Archivo Narrow", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", "Roboto Mono", Consolas, "Courier New", monospace;

  --shell: 1240px;
  --gutter: clamp(18px, 4vw, 32px);
  --header-h: 76px;
  --radius: 3px;
  --shadow-hard: 8px 8px 0 rgba(3, 5, 12, 0.92);
  --shadow-soft: 0 24px 60px -34px rgba(0, 0, 0, 0.95);
  --ease: cubic-bezier(0.22, 0.8, 0.3, 1);
}

/* --- 2. Reset 与中文排版 ------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
  background: var(--void);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(880px 520px at 84% -6%, rgba(168, 85, 247, 0.20), transparent 62%),
    radial-gradient(720px 480px at 4% 2%, rgba(34, 211, 238, 0.16), transparent 60%),
    linear-gradient(180deg, rgba(11, 18, 36, 0.55), rgba(5, 7, 15, 0) 42%);
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--white);
  text-wrap: balance;
}

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

a { color: var(--cyan); text-decoration: none; }
a:hover { color: var(--white); }

ul, ol { margin: 0 0 1.1em; padding-left: 1.2em; }

img, svg, video { max-width: 100%; display: block; }

button { font: inherit; color: inherit; }

strong { color: var(--white); font-weight: 700; }

::selection { background: rgba(34, 211, 238, 0.32); color: var(--white); }

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

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--cyan);
  color: var(--void);
  font-weight: 800;
  border-radius: var(--radius);
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 12px; color: var(--void); }

/* --- 3. 通用布局 --------------------------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { position: relative; padding-block: clamp(52px, 8vw, 104px); }

.section--lead { padding-top: calc(var(--header-h) + clamp(26px, 5vw, 64px)); }

.stack > * + * { margin-top: 18px; }

.grid-2 {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-3 {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* --- 4. 面板与文字层级 --------------------------------------------------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  background: var(--panel);
  border: 2px solid var(--edge);
  box-shadow: var(--shadow-hard);
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.section-title {
  font-size: clamp(26px, 3.4vw, 38px);
  margin: 0;
}

.lede {
  max-width: 62ch;
  margin: 12px 0 0;
  font-size: 17px;
  color: var(--text);
}

.rule {
  height: 2px;
  margin: 0;
  border: 0;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 52%, transparent);
}

.prose { max-width: 68ch; }
.prose h2 { font-size: clamp(22px, 2.6vw, 30px); margin: 1.7em 0 0.6em; }
.prose h3 { font-size: 20px; margin: 1.5em 0 0.5em; }
.prose p { margin: 0 0 1.15em; }
.prose ul, .prose ol { margin: 0 0 1.2em; }
.prose li { margin-bottom: 0.4em; }
.prose a { text-decoration: underline; text-underline-offset: 3px; }

/* --- 5. 面包屑 ----------------------------------------------------------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}
.crumb { display: inline-flex; align-items: center; gap: 10px; }
.crumb + .crumb::before { content: "/"; color: var(--edge); }
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--cyan); }
.crumb[aria-current="page"] { color: var(--white); }

/* --- 6. 按钮与标签 ------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
    background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn--primary {
  background: linear-gradient(120deg, var(--cyan), #38BDF8 46%, var(--violet));
  color: var(--void);
  box-shadow: 5px 5px 0 rgba(34, 211, 238, 0.22);
}
.btn--primary:hover {
  color: var(--void);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(34, 211, 238, 0.3);
}

.btn--ghost {
  background: rgba(11, 18, 36, 0.72);
  border-color: var(--edge);
  color: var(--white);
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn--quiet {
  background: transparent;
  border-color: rgba(34, 211, 238, 0.45);
  color: var(--cyan);
}
.btn--quiet:hover { background: rgba(34, 211, 238, 0.12); color: var(--white); }

.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.45; pointer-events: none; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1px solid currentColor;
  border-radius: 2px;
}
.tag--cyan { color: var(--cyan); background: rgba(34, 211, 238, 0.10); }
.tag--violet { color: var(--violet); background: rgba(168, 85, 247, 0.12); }
.tag--amber { color: var(--amber); background: rgba(245, 158, 11, 0.12); }
.tag--green { color: var(--green); background: rgba(52, 211, 153, 0.12); }

/* --- 7. 数据与媒体组件 --------------------------------------------------- */
.stat-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.stat {
  padding: 16px 18px;
  background: rgba(11, 18, 36, 0.72);
  border: 2px solid var(--edge);
}
.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--white);
}
.stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.stat--accent { border-color: rgba(245, 158, 11, 0.5); }
.stat--accent .stat-value { color: var(--amber); }

.data-figure {
  position: relative;
  padding: 18px;
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.07), rgba(168, 85, 247, 0.07));
  border: 2px solid var(--edge);
  overflow: hidden;
}
.data-figure__caption {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(140deg, #0B1224, #05070F 70%);
  border: 2px solid var(--edge);
  overflow: hidden;
}
.media-frame > img,
.media-frame > svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--white);
  background: rgba(5, 7, 15, 0.78);
  border-top: 2px solid var(--cyan);
}

/* --- 8. 页头 ------------------------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  border-bottom: 2px solid transparent;
  background: linear-gradient(180deg, rgba(5, 7, 15, 0.78), rgba(5, 7, 15, 0));
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease),
    box-shadow 0.3s var(--ease);
}

.site-header[data-scrolled] {
  background: rgba(7, 11, 22, 0.95);
  border-bottom-color: var(--edge);
  box-shadow: 0 20px 44px -32px rgba(0, 0, 0, 1);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.header-shell {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--shell);
  height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.header-identity {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--white);
  text-decoration: none;
}
.brand:hover { color: var(--white); }

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  color: var(--white);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.28), rgba(168, 85, 247, 0.28));
  border: 2px solid var(--cyan);
  box-shadow: 4px 4px 0 rgba(34, 211, 238, 0.18);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--white);
}
.brand-sub {
  margin-top: 2px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.zone-ping {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 5px 11px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
  background: rgba(11, 18, 36, 0.6);
  border: 2px solid var(--edge);
}
.zone-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.18);
  animation: zone-pulse 2.4s var(--ease) infinite;
}
.zone-label { font-family: var(--font-mono); font-weight: 700; color: var(--white); }

@keyframes zone-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(0.82); }
}

.site-nav { display: flex; align-items: center; gap: 6px; margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-item { display: block; }

.nav-link {
  display: inline-block;
  padding: 9px 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  border: 2px solid transparent;
  border-radius: var(--radius);
  transition: color 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.nav-link:hover {
  color: var(--white);
  background: rgba(34, 211, 238, 0.10);
  border-color: rgba(34, 211, 238, 0.35);
}
.nav-link[aria-current="page"] {
  color: var(--white);
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.18), rgba(168, 85, 247, 0.12));
  border-color: rgba(34, 211, 238, 0.6);
}

.nav-actions { display: none; }
.nav-cta { display: inline-flex; justify-content: center; width: 100%; }

.header-actions { display: flex; align-items: center; gap: 10px; margin-left: 6px; }
.header-cta { white-space: nowrap; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 46px;
  height: 46px;
  padding: 0 11px;
  cursor: pointer;
  background: rgba(11, 18, 36, 0.85);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); }
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--white);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.14);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  overflow: hidden;
  background: rgba(34, 211, 238, 0.10);
}
.progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transition: width 0.12s linear;
}

/* --- 9. 页脚 ------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 110px);
  padding: clamp(44px, 6vw, 68px) 0 26px;
  background: linear-gradient(180deg, #070B16, var(--panel) 34%, #05070F);
  border-top: 2px solid var(--edge);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: -2px 0 auto;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 32%, var(--violet) 68%, transparent);
  opacity: 0.75;
}

.footer-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-grid {
  display: grid;
  gap: clamp(26px, 3.4vw, 40px);
  grid-template-columns: 1.6fr 1fr 1fr 1.5fr;
}

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

.footer-title {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.footer-brand .brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.footer-note {
  max-width: 34ch;
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.footer-icp {
  display: inline-flex;
  align-items: center;
  margin: 16px 0 0;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--text);
  border: 2px solid var(--edge);
}

.footer-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: inline-block;
  font-size: 15px;
  color: var(--text);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.footer-link:hover { color: var(--white); border-bottom-color: var(--cyan); }

.contact-list { margin: 0; padding: 0; list-style: none; }

.contact-item {
  display: grid;
  grid-template-columns: minmax(62px, auto) 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(124, 138, 165, 0.25);
}
.contact-key { font-size: 12px; letter-spacing: 0.1em; color: var(--muted); }
.contact-value {
  font-size: 14px;
  color: var(--white);
  word-break: break-word;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: clamp(30px, 4vw, 44px);
  padding-top: 20px;
  border-top: 1px solid rgba(22, 33, 61, 0.9);
}

.footer-copy { margin: 0; font-size: 12.5px; color: var(--muted); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.legal-link { font-size: 12.5px; color: var(--muted); }
.legal-link:hover { color: var(--cyan); }

/* --- 10. 目录、标签页、返回顶部 ------------------------------------------ */
.toc { position: sticky; top: calc(var(--header-h) + 24px); }
.toc-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--muted);
}
.toc-list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--edge);
}
.toc-link {
  display: block;
  margin-left: -2px;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--muted);
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background 0.2s var(--ease);
}
.toc-link:hover { color: var(--white); }
.toc-link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--edge);
}
.tab {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  background: transparent;
  border: 2px solid var(--edge);
  border-radius: 2px;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background 0.2s var(--ease);
}
.tab:hover { color: var(--white); border-color: rgba(34, 211, 238, 0.5); }
.tab[aria-selected="true"] {
  color: var(--void);
  background: linear-gradient(120deg, var(--cyan), var(--violet));
  border-color: transparent;
}
.tab-panel { padding-top: 20px; }
.tab-panel[hidden] { display: none; }

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

.back-top {
  position: fixed;
  right: 20px;
  bottom: 22px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--white);
  background: rgba(11, 18, 36, 0.92);
  border: 2px solid var(--edge);
  border-radius: var(--radius);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease),
    border-color 0.2s var(--ease), color 0.2s var(--ease), visibility 0.25s;
}
.back-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { color: var(--cyan); border-color: var(--cyan); }
.back-top__mark { font-family: var(--font-mono); font-size: 14px; }

/* --- 11. 响应式 ---------------------------------------------------------- */
@media (max-width: 1180px) {
  .zone-ping { display: none; }
}

@media (max-width: 1024px) {
  :root { --header-h: 64px; }

  .site-header {
    background: linear-gradient(180deg, rgba(5, 7, 15, 0.94), rgba(5, 7, 15, 0.68));
  }
  .header-shell { gap: 10px; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100vh - var(--header-h));
    max-height: calc(100dvh - var(--header-h));
    margin-left: 0;
    padding: 14px var(--gutter) 26px;
    overflow-y: auto;
    background: linear-gradient(180deg, #070B16, #05070F 88%);
    border-bottom: 2px solid var(--edge);
    box-shadow: var(--shadow-soft);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.28s var(--ease), transform 0.28s var(--ease),
      visibility 0.28s;
  }
  .site-nav[data-open] { opacity: 1; visibility: visible; transform: none; }

  .nav-list { flex-direction: column; align-items: stretch; width: 100%; }
  .nav-item { border-bottom: 1px solid rgba(22, 33, 61, 0.9); }
  .nav-link {
    display: block;
    padding: 14px 4px;
    font-size: 17px;
    border: 0;
    border-radius: 0;
  }
  .nav-link[aria-current="page"] {
    background: transparent;
    border: 0;
    border-left: 2px solid var(--cyan);
    padding-left: 12px;
    color: var(--cyan);
  }
  .nav-actions { display: block; padding-top: 18px; }

  body.nav-open { overflow: hidden; }
}

@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .brand-sub { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .back-top { right: 14px; bottom: 16px; }
}

/* --- 12. 降低动态效果 ---------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .zone-dot { animation: none; }
}