/* =========================================================
   万象城赛场 · 共享样式 /assets/site.css
   深空黑底 + 雷达荧光绿指挥舱体系
   ========================================================= */

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html, body, h1, h2, h3, h4, h5, p, ul, ol, li, dl, dt, dd, figure, blockquote, nav, header, footer, section, article, aside {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 128px;
}

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

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

/* ---------- 变量 ---------- */
:root {
  --ink: #06090B;
  --panel: #0F1518;
  --glass: #1A242B;
  --grid: #243138;
  --radar: #5BF08C;
  --radar-deep: #1F7A4A;
  --signal: #FF8A3C;
  --steel: #93A9B8;
  --paper: #F1F7F3;
  --alert: #FF5C5C;

  --shell: 1320px;
  --gutter: 48px;
  --row: 24px;

  --r-sm: 4px;
  --r-md: 10px;
  --shear: 12px;

  --ease: cubic-bezier(.22, .61, .36, 1);

  --font-display: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", system-ui, sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-mono: ui-monospace, "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, monospace;
}

/* ---------- 基础排版 ---------- */
body {
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 78% -12%, rgba(91, 240, 140, .07), transparent 55%),
    linear-gradient(rgba(36, 49, 56, .22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 49, 56, .22) 1px, transparent 1px);
  background-size: auto, 72px 72px, 72px 72px;
  background-attachment: fixed;
  color: var(--steel);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.05;
  color: var(--paper);
}

p { font-size: 15px; }

#main-content {
  position: relative;
  z-index: 1;
  display: block;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

.label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--radar);
  line-height: 1.4;
}

/* ---------- 容器与网格 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--row);
}

/* ---------- 跳至主要内容 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  transform: translateY(-200%);
  background: var(--radar);
  color: #04170C;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .04em;
  padding: 11px 18px;
  border-radius: var(--r-sm);
  transition: transform .18s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-utility {
  background: var(--ink);
  border-bottom: 1px solid var(--grid);
}

.header-utility__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 36px;
}

.header-brandline {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 12px;
  letter-spacing: .02em;
  color: #6E8595;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .02em;
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--radar);
  box-shadow: 0 0 0 3px rgba(91, 240, 140, .16);
  animation: dot-blip 2.4s ease-in-out infinite;
}

@keyframes dot-blip {
  0%, 100% { opacity: 1; }
  50% { opacity: .35; }
}

.status-text { color: var(--paper); }

.header-clock { color: #5C7280; }

.header-clock .mono {
  color: var(--radar);
  display: inline-block;
}

.is-pulse { animation: stamp-pulse .42s ease-out; }

@keyframes stamp-pulse {
  0% { opacity: 1; text-shadow: 0 0 10px rgba(91, 240, 140, .9); }
  45% { opacity: .4; text-shadow: 0 0 18px rgba(91, 240, 140, 1); }
  100% { opacity: 1; text-shadow: none; }
}

.header-quick {
  flex: 0 0 auto;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper);
  border: 1px solid var(--grid);
  border-radius: 999px;
  padding: 4px 12px;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.header-quick:hover {
  border-color: var(--radar);
  color: var(--radar);
}

.header-bar {
  position: relative;
  background: rgba(6, 9, 11, .88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--grid);
}

.header-bar__inner {
  display: flex;
  align-items: center;
  gap: 26px;
  min-height: 68px;
}

/* 品牌簇 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand-mark {
  position: relative;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 50%;
  border: 1px solid var(--radar-deep);
  background: radial-gradient(circle at 50% 50%, rgba(91, 240, 140, .2), rgba(6, 9, 11, 0) 72%);
  overflow: hidden;
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 50%;
  border: 1px solid rgba(91, 240, 140, .4);
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 50%;
  height: 1px;
  background: linear-gradient(90deg, var(--radar), rgba(91, 240, 140, 0));
  transform-origin: 0 50%;
  animation: radar-sweep 8s linear infinite;
}

@keyframes radar-sweep {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.brand-words {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--paper);
}

.brand-tag {
  margin-top: 4px;
  font-size: 10px;
  letter-spacing: .2em;
  color: rgba(91, 240, 140, .6);
  text-transform: uppercase;
}

.brand--footer .brand-mark { width: 30px; height: 30px; }
.brand--footer .brand-name { font-size: 17px; }

/* 折叠按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  border: 1px solid var(--grid);
  border-radius: 999px;
  padding: 8px 15px 8px 13px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--paper);
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 14px;
  height: 11px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--radar);
  transition: transform .2s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] {
  border-color: var(--radar);
  background: rgba(91, 240, 140, .08);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(4.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* 主导航 */
.site-nav {
  display: flex;
  flex: 1 1 auto;
  align-items: center;
  justify-content: flex-end;
  gap: 22px;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 12px;
  font-size: 14px;
  color: var(--steel);
  border-radius: var(--r-sm);
  transition: color .16s var(--ease), background-color .16s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 1.5px;
  background: var(--radar);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .22s var(--ease);
}

.nav-link:hover { color: var(--paper); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--radar);
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-cta {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--radar);
  color: #04170C;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .04em;
  padding: 11px 20px;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.nav-cta:hover {
  background: var(--paper);
  color: #04170C;
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--radar), var(--signal));
  transition: transform .12s linear;
  pointer-events: none;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 104px;
  border-top: 1px solid var(--grid);
  background: linear-gradient(180deg, rgba(15, 21, 24, .72), var(--ink) 46%);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: 34px;
  padding-top: 56px;
  padding-bottom: 44px;
}

.footer-identity {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
}

.footer-lead {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 9px;
  font-size: 13px;
}

.footer-contact__line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--paper);
}

.footer-contact__line .label { flex: 0 0 auto; }

.footer-title {
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--paper);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 11px;
}

.footer-list a {
  position: relative;
  font-size: 14px;
  color: var(--steel);
  transition: color .16s var(--ease), padding-left .16s var(--ease);
}

.footer-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 0;
  height: 1px;
  background: var(--radar);
  transition: width .16s var(--ease);
}

.footer-list a:hover {
  color: var(--paper);
  padding-left: 14px;
}

.footer-list a:hover::before { width: 9px; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
  padding-top: 20px;
  padding-bottom: 30px;
  border-top: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 12px;
  color: #5C7280;
}

.footer-legal__item { font-size: 12px; }

.footer-legal__icp { color: var(--steel); }

.footer-legal__copy {
  margin-left: auto;
  color: #5C7280;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .03em;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.btn--primary {
  background: var(--radar);
  color: #04170C;
}

.btn--primary:hover { background: var(--paper); }

.btn--ghost {
  background: rgba(26, 36, 43, .55);
  border-color: var(--grid);
  color: var(--paper);
}

.btn--ghost:hover {
  border-color: var(--radar);
  color: var(--radar);
}

.btn--signal {
  background: var(--signal);
  color: #1A0C02;
}

.btn--signal:hover { background: #FFA466; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #5C7280;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--grid);
}

.breadcrumb a {
  color: var(--steel);
  transition: color .16s var(--ease);
}

.breadcrumb a:hover { color: var(--radar); }

.breadcrumb [aria-current="page"] { color: var(--paper); }

/* ---------- 正文容器 ---------- */
.prose {
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.72;
  color: var(--steel);
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 {
  margin-top: 1.9em;
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 800;
  line-height: 1.15;
  color: var(--paper);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: 18px;
  font-weight: 800;
  color: var(--paper);
}

.prose strong { color: var(--paper); }

.prose a {
  color: var(--radar);
  border-bottom: 1px solid rgba(91, 240, 140, .35);
}

.prose ul,
.prose ol {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.prose ul li {
  position: relative;
  padding-left: 20px;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 9px;
  height: 1px;
  background: var(--radar);
}

.prose ol {
  counter-reset: prose-ol;
}

.prose ol li {
  position: relative;
  padding-left: 30px;
  counter-increment: prose-ol;
}

.prose ol li::before {
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--radar);
}

.prose code {
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: .9em;
  color: var(--paper);
  background: var(--glass);
  border-radius: 3px;
}

.prose blockquote {
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--radar-deep);
  color: var(--paper);
  font-size: 15px;
}

/* ---------- 面板 / 玻璃层 ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--grid);
  border-radius: var(--r-md);
}

.glass {
  background: linear-gradient(160deg, rgba(26, 36, 43, .8), rgba(15, 21, 24, .62));
  border: 1px solid rgba(147, 169, 184, .16);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-radius: var(--r-md);
}

/* ---------- 斜切标签 ---------- */
.slash-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 17px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--paper);
  background: var(--glass);
  border: 1px solid var(--grid);
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.slash-tag:hover {
  color: var(--radar);
  border-color: var(--radar);
  background: rgba(91, 240, 140, .08);
}

/* ---------- 刻度分隔线 ---------- */
.tick-rule {
  position: relative;
  height: 12px;
  border-top: 1px solid var(--grid);
  overflow: hidden;
}

.tick-rule::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(
    to right,
    rgba(147, 169, 184, .3) 0,
    rgba(147, 169, 184, .3) 1px,
    transparent 1px,
    transparent 24px
  );
}

/* ---------- 区块标题行 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px 32px;
  margin-bottom: 30px;
}

.section-head h2 {
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.05;
  color: var(--paper);
}

.section-head__note {
  max-width: 42ch;
  font-size: 14px;
  line-height: 1.65;
  color: #6E8595;
}

/* ---------- 可展开内容组 ---------- */
.disclosure {
  background: var(--panel);
  border: 1px solid var(--grid);
  border-radius: var(--r-md);
  transition: border-color .2s var(--ease);
}

.disclosure + .disclosure { margin-top: 10px; }

.disclosure.is-open { border-color: rgba(91, 240, 140, .45); }

.disclosure__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 18px 20px;
  text-align: left;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
  transition: background-color .18s var(--ease);
}

.disclosure__trigger:hover { background: rgba(26, 36, 43, .6); }

.disclosure__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.disclosure__icon::before,
.disclosure__icon::after {
  content: "";
  position: absolute;
  background: var(--radar);
  transition: transform .24s var(--ease);
}

.disclosure__icon::before { top: 6px; left: 0; width: 14px; height: 2px; }
.disclosure__icon::after { left: 6px; top: 0; width: 2px; height: 14px; }

.disclosure.is-open .disclosure__icon::after { transform: scaleY(0); }

.disclosure__panel {
  padding: 0 20px 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--steel);
}

.js-ready .disclosure__panel {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
  transition: max-height .24s ease-out, opacity .24s ease-out, padding .24s ease-out;
}

.js-ready .disclosure.is-open .disclosure__panel {
  max-height: 680px;
  opacity: 1;
  padding-bottom: 20px;
}

/* ---------- 媒体容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--panel);
  border: 1px solid var(--grid);
  border-radius: var(--r-md);
}

.media-frame > img,
.media-frame > svg,
.media-frame > canvas,
.media-frame > picture {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(6, 9, 11, 0) 52%, rgba(6, 9, 11, .68) 100%);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 进入动效 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .22s ease-out, transform .22s ease-out;
  transition-delay: var(--reveal-delay, 0ms);
}

.js-ready [data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 锚点目录选中态（供页面侧栏使用） ---------- */
[data-spy-link] {
  display: block;
  padding: 7px 0 7px 14px;
  border-left: 1px solid var(--grid);
  font-size: 13px;
  color: #6E8595;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

[data-spy-link]:hover { color: var(--paper); }

[data-spy-link][aria-current="true"] {
  color: var(--radar);
  border-left-color: var(--radar);
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  :root {
    --gutter: 32px;
    --row: 20px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    margin-left: 0;
    padding: 16px var(--gutter) 22px;
    background: rgba(6, 9, 11, .97);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--grid);
  }

  .site-nav[data-open] { display: flex; }

  .nav-list {
    flex-wrap: nowrap;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .nav-list::-webkit-scrollbar { display: none; }

  .nav-item { flex: 0 0 auto; }

  .nav-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 15px;
    font-size: 13px;
    background: var(--panel);
    border: 1px solid var(--grid);
    border-radius: 999px;
  }

  .nav-link::after { display: none; }

  .nav-link::before {
    content: "";
    flex: 0 0 auto;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--grid);
    transition: background-color .16s var(--ease), box-shadow .16s var(--ease);
  }

  .nav-link[aria-current="page"] {
    border-color: var(--radar);
    background: rgba(91, 240, 140, .1);
  }

  .nav-link[aria-current="page"]::before {
    background: var(--radar);
    box-shadow: 0 0 8px rgba(91, 240, 140, .75);
  }

  .nav-cta {
    width: 100%;
    justify-content: center;
    padding: 14px 18px;
  }

  .footer-top {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px;
  }

  .footer-identity { grid-column: 1 / -1; }
}

@media (max-width: 660px) {
  :root {
    --gutter: 20px;
    --row: 16px;
  }

  html { scroll-padding-top: 108px; }

  body {
    background-attachment: scroll;
    background-size: auto, 56px 56px, 56px 56px;
  }

  .header-brandline { display: none; }

  .header-utility__inner {
    justify-content: space-between;
    gap: 12px;
  }

  .header-status { font-size: 10px; gap: 7px; }

  .header-quick { display: none; }

  .header-bar__inner { min-height: 60px; gap: 14px; }

  .brand-name { font-size: 17px; }
  .brand-tag { font-size: 9px; letter-spacing: .16em; }

  .grid-12 { grid-template-columns: 1fr; }

  .site-footer { margin-top: 72px; }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 42px;
    padding-bottom: 34px;
  }

  .footer-legal {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .footer-legal__copy { margin-left: 0; }

  .media-frame { aspect-ratio: 4 / 3; }
  .media-frame--wide { aspect-ratio: 16 / 9; }
}

/* ---------- 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

  .js-ready [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .scroll-progress { transition: none; }
}