:root {
  --color-surface: #fcfcfc;
  --color-surface-alt: #f2f2f2;
  --color-surface-deep: #e5e4e4;
  --color-ink: #393234;
  --color-ink-soft: #695e61;
  --color-ink-muted: #857a7d;
  --color-line: #d9d8d8;
  --color-primary: #e41b49;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f9dce3;
  --color-accent: #e31c49;
  --color-accent-ink: #ffffff;
  --color-highlight: #f8d4dc;
  --color-focus: #e10f3e;
  --color-contrast-surface: #2b1419;
  --color-contrast-ink: #e7e4e5;
  --color-contrast-line: #544246;
  --color-contrast-accent: #e8456a;
  --overlay-scrim: linear-gradient(180deg, rgba(43, 20, 25, 0.35) 0%, rgba(43, 20, 25, 0.72) 55%, rgba(43, 20, 25, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 11.7px;
  --text-sm: 15.6px;
  --text-base: 18px;
  --text-lg: 24.0px;
  --text-xl: 32.0px;
  --text-2xl: 42.6px;
  --text-3xl: 56.8px;
  --text-4xl: 75.8px;
  --text-display: clamp(35px, 7.1vw, 91px);
  --text-figure: clamp(29px, 5.2vw, 66px);
  --weight-heading: 768;
  --weight-body: 400;
  --leading-body: 1.81;
  --leading-heading: 1.26;
  --tracking-heading: -0.007em;
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-pill: 0px;
  --border-thin: 2px;
  --border-thick: 3px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1100px;
  --measure: 65ch;
  --gutter: 16px;
  --section-y: 83px;
  --section-y-lg: 116px;
}

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

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

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: inherit;
  text-wrap: balance;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p, ul, ol, dl, blockquote, figure { margin: 0 0 var(--space-3); }
p { max-width: var(--measure); }
ul, ol { padding-left: 1.3em; }

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

a {
  color: var(--color-primary);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
a:hover { color: var(--color-accent); }

button, input, select, textarea { font: inherit; color: inherit; }

hr {
  border: 0;
  border-top: 1px solid var(--color-line);
  margin: var(--space-6) 0;
}

[hidden] { display: none !important; }

/* 全局可见焦点态：3px 焦点环 */
:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ============ 2. 工具类 ============ */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.05;
  letter-spacing: var(--tracking-heading);
  margin: 0 0 var(--space-3);
}

.figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}

/* ============ 3. 布局骨架 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }

.section--alt { background: var(--color-surface-alt); }
.section--deep { background: var(--color-surface-deep); }

.section--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4 { color: var(--color-contrast-ink); }
.section--contrast a { color: var(--color-contrast-accent); }
.section--contrast a:hover { color: var(--color-contrast-ink); }
.section--contrast hr { border-top-color: var(--color-contrast-line); }
.section--contrast :focus-visible { outline-color: var(--color-contrast-ink); }
.section--contrast .card {
  background: transparent;
  border-color: var(--color-contrast-line);
}
.section--contrast .tag {
  background: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.section--contrast .eyebrow {
  background: var(--color-contrast-accent);
  color: var(--color-accent-ink);
}

.grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: minmax(0, 1fr);
}

.grid--12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3) var(--gutter);
}

.col-span-full { grid-column: 1 / -1; }
.col-4, .col-5, .col-6, .col-7, .col-8, .col-12 { grid-column: 1 / -1; }

@media (min-width: 700px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1000px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 5; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 7; }
  .col-8 { grid-column: span 8; }
  .col-12 { grid-column: span 12; }
}

/* ============ 4. 文字构件 ============ */
.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-2);
  padding: 4px 10px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1.4;
}

.stamp {
  display: inline-block;
  padding: 3px 9px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.5;
}

.stamp--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.lede {
  font-size: var(--text-lg);
  line-height: 1.62;
  color: var(--color-ink-soft);
  max-width: var(--measure);
  margin-bottom: var(--space-4);
}

.prose { max-width: var(--measure); }
.prose li { max-width: var(--measure); }
.prose p:last-child { margin-bottom: 0; }

/* ============ 5. 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 11px 20px;
  min-height: 46px;
  border: var(--border-thin) solid var(--color-ink);
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 140ms ease-out, border-color 140ms ease-out, color 140ms ease-out;
}

.btn:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-ink);
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--primary:hover {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}
.btn--ghost:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.btn--block { width: 100%; }

.section--contrast .btn {
  background: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.section--contrast .btn:hover {
  background: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
  color: var(--color-accent-ink);
}
.section--contrast .btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.section--contrast .btn--primary:hover {
  background: var(--color-contrast-ink);
  border-color: var(--color-contrast-ink);
  color: var(--color-contrast-surface);
}

/* ============ 6. 内容构件 ============ */
.card {
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  padding: var(--space-3);
}
.card--accent { border-color: var(--color-primary); }
.card h3, .card h4 { margin-bottom: var(--space-2); }
.card > :last-child { margin-bottom: 0; }

.tag {
  display: inline-block;
  padding: 4px 10px;
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1.4;
}

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.link-list li { max-width: none; }
.link-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-ink);
  font-weight: 600;
  text-decoration: none;
  transition: color 140ms ease-out, border-color 140ms ease-out;
}
.link-list a::after {
  content: "›";
  font-family: var(--font-mono);
  color: var(--color-primary);
}
.link-list a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  margin-bottom: var(--space-4);
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}
.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  max-width: none;
}
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--color-line);
}
.breadcrumb a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.breadcrumb a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.expander {
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}
.expander + .expander { margin-top: calc(-1 * var(--border-thin)); }
.expander__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-weight: 700;
  font-size: var(--text-base);
  cursor: pointer;
  list-style: none;
  transition: background-color 140ms ease-out;
}
.expander__summary::-webkit-details-marker { display: none; }
.expander__summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--color-primary);
}
.expander__summary:hover { background: var(--color-primary-soft); }
.expander[open] > .expander__summary {
  background: var(--color-highlight);
  border-bottom: 1px solid var(--color-line);
}
.expander[open] > .expander__summary::after { content: "－"; }
.expander__body {
  padding: var(--space-3);
}
.expander__body > :last-child { margin-bottom: 0; }

/* ============ 7. 图片容器 ============ */
.media {
  margin: 0 0 var(--space-3);
  padding: var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
}
.media__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-line);
  background: var(--color-surface-deep);
  aspect-ratio: 4 / 3;
}
.media__frame--wide { aspect-ratio: 16 / 9; }
.media__frame--tall { aspect-ratio: 3 / 4; }
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__scrim {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
}
.media__tag {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  padding: 3px 9px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
}
.media__caption {
  margin: var(--space-2) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* ============ 8. 跳转链接 ============ */
.skip-link {
  position: absolute;
  top: -120px;
  left: var(--space-3);
  z-index: 200;
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border: var(--border-thick) solid var(--color-focus);
  font-weight: 800;
  font-size: var(--text-base);
  text-decoration: none;
  transition: top 140ms ease-out;
}
.skip-link:focus {
  top: var(--space-2);
  color: var(--color-primary-ink);
}

/* ============ 9. 头部浮岛 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.site-header__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.island {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
}

.island--brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  flex: 1 1 100%;
  padding: var(--space-1) var(--space-2);
}

.island--nav {
  flex: 1 1 100%;
  padding: var(--space-2);
}

.site-header[data-open="false"] .island--nav { display: none; }

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1);
  border: var(--border-thin) solid transparent;
  color: var(--color-ink);
  text-decoration: none;
  transition: background-color 140ms ease-out, border-color 140ms ease-out;
}
.brand:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-ink);
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 800;
}
.brand__text { display: block; }
.brand__name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: var(--tracking-heading);
}
.brand__note {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 14px;
  background: var(--color-surface);
  color: var(--color-ink);
  border: var(--border-thin) solid var(--color-ink);
  font-weight: 700;
  font-size: var(--text-base);
  cursor: pointer;
  transition: background-color 140ms ease-out, border-color 140ms ease-out, color 140ms ease-out;
}
.nav-toggle:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.site-header[data-open="true"] .nav-toggle {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}
.nav-toggle__bars span {
  display: block;
  height: var(--border-thick);
  background: currentColor;
}
.nav-toggle__label { display: inline-block; }

.site-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.site-nav__item { max-width: none; }
.site-nav__item + .site-nav__item { border-top: 1px solid var(--color-line); }

.site-nav__link {
  position: relative;
  display: block;
  padding: var(--space-2);
  border: var(--border-thin) solid transparent;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.3;
  text-decoration: none;
  transition: background-color 140ms ease-out, border-color 140ms ease-out, color 140ms ease-out;
}
.site-nav__link:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-ink);
}
.site-nav__link[aria-current="page"] {
  background: var(--color-highlight);
  border-color: var(--color-focus);
}
.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--border-thick);
  background: var(--color-primary);
}

.site-nav__aside {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}
.site-nav__aside .btn { flex: 1 1 auto; }

.site-header__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(-1 * var(--border-thin));
  height: var(--border-thick);
  overflow: hidden;
  background: var(--color-primary-soft);
}
.site-header__progress > span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--color-primary);
  transition: width 140ms linear;
}

/* ============ 10. 页脚 ============ */
.site-footer {
  background: var(--color-surface);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
}

.site-footer__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--section-y) var(--gutter) var(--space-8);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6) var(--space-3);
}

.footer-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1.3;
  margin: 0 0 var(--space-1);
  max-width: var(--measure);
}
.footer-brand__note {
  margin: 0 0 var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}
.footer-brand__line {
  margin: var(--space-2) 0 0;
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

.footer-nav {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4) var(--space-3);
}

.footer-col__title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 800;
  letter-spacing: 0.04em;
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--color-line);
  color: var(--color-ink);
}
.footer-col__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
}
.footer-col__list li { max-width: none; }
.footer-col__list a {
  display: inline-block;
  padding: 2px 0;
  color: var(--color-ink);
  font-weight: 600;
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 140ms ease-out, border-color 140ms ease-out;
}
.footer-col__list a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.footer-contact__list { margin: 0; }
.footer-contact__list dt {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  letter-spacing: 0.04em;
}
.footer-contact__list dd {
  margin: 0;
  font-weight: 600;
  max-width: var(--measure);
}
.footer-contact__note {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.site-footer__base {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter) var(--space-6);
  border-top: 1px solid var(--color-line);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.site-footer__base p { margin: 0; max-width: var(--measure); }
.site-footer__icp { color: var(--color-ink); font-weight: 700; }

/* ============ 11. 断点 ============ */
@media (min-width: 700px) {
  .footer-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .site-footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (min-width: 1000px) {
  .site-header__inner { flex-wrap: nowrap; }

  .island--brand {
    flex: 0 0 auto;
    justify-content: flex-start;
  }
  .island--nav {
    flex: 1 1 auto;
    padding: var(--space-1) var(--space-2);
  }
  .site-header[data-open="false"] .island--nav { display: block; }

  .nav-toggle { display: none; }

  .site-nav {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-2);
  }
  .site-nav__list {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 2px;
  }
  .site-nav__item + .site-nav__item { border-top: 0; }
  .site-nav__link {
    font-size: var(--text-base);
    padding: 10px 12px;
    line-height: 1.2;
  }
  .site-nav__aside { flex-wrap: nowrap; }
  .site-nav__aside .btn {
    flex: 0 0 auto;
    min-height: 40px;
    padding: 8px 16px;
    font-size: var(--text-base);
  }

  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.7fr) minmax(0, 1.1fr);
    align-items: start;
    gap: var(--space-6) var(--space-4);
  }
  .footer-brand { grid-column: auto; }
}

/* ============ 12. 动效与偏好 ============ */
@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;
  }
}