:root {
  --color-surface: #fefefe;
  --color-surface-alt: #f6f5f5;
  --color-surface-deep: #eae8e8;
  --color-ink: #554949;
  --color-ink-soft: #7d6d6e;
  --color-ink-muted: #877878;
  --color-line: #e0dddd;
  --color-primary: #b54a4d;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f4e5e5;
  --color-accent: #c35013;
  --color-accent-ink: #ffffff;
  --color-highlight: #f3dfd4;
  --color-focus: #c94b08;
  --color-contrast-surface: #181011;
  --color-contrast-ink: #e7e4e4;
  --color-contrast-line: #463f3f;
  --color-contrast-accent: #e86017;
  --overlay-scrim: linear-gradient(180deg, rgba(24, 16, 17, 0.35) 0%, rgba(24, 16, 17, 0.72) 55%, rgba(24, 16, 17, 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: 12.2px;
  --text-sm: 14.6px;
  --text-base: 16px;
  --text-lg: 19.2px;
  --text-xl: 23.0px;
  --text-2xl: 27.6px;
  --text-3xl: 33.2px;
  --text-4xl: 39.8px;
  --text-display: clamp(38px, 7.8vw, 100px);
  --text-figure: clamp(32px, 5.6vw, 72px);
  --weight-heading: 682;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.15;
  --tracking-heading: 0.008em;
  --radius-sm: 14px;
  --radius-md: 20px;
  --radius-lg: 25px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(85, 73, 73, 0.08);
  --shadow-2: 0 18px 44px rgba(85, 73, 73, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1260px;
  --measure: 67ch;
  --gutter: 32px;
  --section-y: 86px;
  --section-y-lg: 120px;
}

/* ============ reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background-color: 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);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}
p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 6px;
}
.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;
}
.skip-link {
  position: absolute; left: 50%; top: -120px; transform: translateX(-50%);
  z-index: 200; padding: 12px 22px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm); letter-spacing: .06em;
  transition: top .2s ease;
}
.skip-link:focus { top: 0; }

/* ============ layout ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(18px, 4.5vw, var(--gutter));
}
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep { background-color: var(--color-surface-deep); }
.section__head { max-width: var(--measure); margin-bottom: var(--space-6); }
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
}
.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; }
.hero-split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: var(--space-6);
  align-items: center;
}

/* ============ typography ============ */
.hero-title {
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: .02em;
}
.figure-xl {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -.01em;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.eyebrow--console { color: var(--color-contrast-accent); }
.field-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}
.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-ink-soft);
}
.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-3); }
.prose h2 { margin-top: var(--space-8); font-size: var(--text-2xl); }
.prose h3 { margin-top: var(--space-6); font-size: var(--text-xl); }
.prose ul, .prose ol { margin-top: var(--space-3); display: grid; gap: var(--space-1); padding-left: var(--space-3); }
.prose li { list-style: disc; }
.prose li::marker { color: var(--color-primary); }
.prose .num { color: var(--color-ink); }

/* ============ 深浅表面 ============ */
.console {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: clamp(24px, 4vw, var(--space-8));
}
.console::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(135deg, color-mix(in srgb, var(--color-contrast-accent) 22%, transparent) 0%, transparent 52%),
    linear-gradient(315deg, color-mix(in srgb, var(--color-primary) 30%, transparent) 0%, transparent 46%);
  pointer-events: none;
}
.console > * { position: relative; z-index: 1; }
.console h1, .console h2, .console h3, .console h4 { color: var(--color-contrast-ink); }
.console p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }
.console a { color: var(--color-contrast-accent); }
.console .field-label { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

/* ============ 卡片 ============ */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  box-shadow: var(--shadow-1);
}
.card--lg { border-radius: var(--radius-lg); padding: var(--space-4); }
.card--float {
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  background-color: color-mix(in srgb, var(--color-surface) 72%, transparent);
  box-shadow: var(--shadow-2);
  backdrop-filter: blur(6px);
}
.card--console {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 9%, transparent);
  color: var(--color-contrast-ink);
  box-shadow: none;
}
.card__title { font-size: var(--text-lg); }
.card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
  color: var(--color-ink-muted);
}
.card--console .card__meta { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-1);
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: .04em;
  box-shadow: var(--shadow-1);
  transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-2); }
.btn--accent { background-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--soft {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  box-shadow: none;
}
.btn--soft:hover { background-color: color-mix(in srgb, var(--color-primary-soft) 70%, var(--color-highlight)); }
.btn--console {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  color: var(--color-contrast-ink);
  box-shadow: none;
}
.btn--console:hover { background-color: color-mix(in srgb, var(--color-contrast-ink) 20%, transparent); }

/* ============ 面包屑 ============ */
.breadcrumb { margin-bottom: var(--space-4); }
.breadcrumb__list {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
  color: var(--color-ink-muted);
}
.breadcrumb__list li + li::before { content: "/"; margin-right: var(--space-2); color: var(--color-line); }
.breadcrumb__list a { color: var(--color-ink-soft); }
.breadcrumb__list a:hover { color: var(--color-primary); }
.breadcrumb__list [aria-current="page"] { color: var(--color-ink); }

/* ============ 标签与状态 ============ */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-xs);
  letter-spacing: .06em;
}
.pill--accent { background-color: var(--color-highlight); color: var(--color-accent); }
.pill--console { background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent); color: var(--color-contrast-ink); }
.status {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
}
.status--live { background-color: var(--color-highlight); color: var(--color-accent); }
.status--pending { background-color: var(--color-primary-soft); color: var(--color-primary); }
.status--archived {
  background-color: color-mix(in srgb, var(--color-contrast-surface) 7%, var(--color-surface-alt));
  color: var(--color-ink-muted);
}
.status--console {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  color: var(--color-contrast-ink);
}

/* ============ 筛选 ============ */
.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.filter-chip {
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  letter-spacing: .04em;
  transition: background-color .2s ease, color .2s ease;
}
.filter-chip:hover { background-color: var(--color-primary-soft); color: var(--color-primary); }
.filter-chip[aria-pressed="true"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-weight: 600;
}

/* ============ 数据表 ============ */
.data-table-wrap { overflow-x: auto; border-radius: var(--radius-sm); }
.data-table { background-color: var(--color-surface); font-size: var(--text-sm); }
.data-table caption {
  caption-side: top;
  padding-bottom: var(--space-2);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.data-table th, .data-table td { padding: 10px var(--space-2); text-align: left; vertical-align: top; }
.data-table thead th {
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  white-space: nowrap;
}
.data-table tbody tr + tr td { border-top: var(--border-thin) solid var(--color-line); }
.data-table tbody tr:hover td { background-color: color-mix(in srgb, var(--color-primary-soft) 55%, var(--color-surface)); }
.data-table td.num, .data-table th.num { text-align: right; }
.data-table--console { background-color: transparent; color: var(--color-contrast-ink); }
.data-table--console caption { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.data-table--console thead th {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 10%, transparent);
  color: var(--color-contrast-ink);
}
.data-table--console tbody tr + tr td { border-top-color: var(--color-contrast-line); }
.data-table--console tbody tr:hover td { background-color: color-mix(in srgb, var(--color-contrast-accent) 14%, transparent); }

/* ============ 时间轴 / 更新日志 ============ */
.log {
  position: relative;
  display: grid;
  gap: var(--space-4);
  padding-left: var(--space-4);
}
.log::before {
  content: "";
  position: absolute; left: 5px; top: 6px; bottom: 6px; width: 2px;
  border-radius: 2px;
  background-image: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-soft) 55%, transparent 100%);
}
.log__item { position: relative; }
.log__item::before {
  content: "";
  position: absolute; left: calc(var(--space-4) * -1 + 1px); top: 8px;
  width: 10px; height: 10px; border-radius: 50%;
  background-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-soft);
}
.log__stage {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.log--console::before { background-image: linear-gradient(180deg, var(--color-contrast-accent) 0%, transparent 100%); }
.log--console .log__item::before {
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-contrast-accent) 22%, transparent);
}
.log--console .log__stage { color: var(--color-contrast-accent); }

/* ============ 图片容器 ============ */
.media-block {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  isolation: isolate;
}
.media-block__img {
  position: absolute; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.media-block__scrim {
  position: absolute; inset: 0; z-index: 1;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}
.media-block__body {
  position: relative; z-index: 2;
  display: flex; flex-direction: column; justify-content: flex-end; gap: var(--space-2);
  min-height: clamp(240px, 38vw, 460px);
  padding: clamp(24px, 4vw, var(--space-8));
  color: var(--color-contrast-ink);
}
.media-block__body h2, .media-block__body h3 { color: var(--color-contrast-ink); }
.media-block__caption {
  font-size: var(--text-xs);
  letter-spacing: .06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}
.media-block--wide { aspect-ratio: 21 / 9; }
.media-block--tall { aspect-ratio: 4 / 5; }
.media-block--fit .media-block__body { min-height: 0; }
.media-thumb {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-deep);
  aspect-ratio: 16 / 9;
}
.media-thumb img { width: 100%; height: 100%; object-fit: cover; }

/* ============ 首屏纯 CSS 视觉 ============ */
.hero-visual {
  position: relative;
  overflow: hidden;
  min-height: 320px;
  border-radius: var(--radius-lg);
  background-image: linear-gradient(150deg, var(--color-primary) 0%, var(--color-accent) 44%, var(--color-contrast-surface) 100%);
  background-size: 180% 180%;
  box-shadow: var(--shadow-2);
  animation: gradient-drift 20s ease-in-out infinite;
}
.hero-visual::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(90deg, color-mix(in srgb, var(--color-contrast-ink) 14%, transparent) 1px, transparent 1px),
    linear-gradient(0deg, color-mix(in srgb, var(--color-contrast-ink) 14%, transparent) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: .55;
}
@keyframes gradient-drift {
  0% { background-position: 0% 0%; }
  50% { background-position: 100% 100%; }
  100% { background-position: 0% 0%; }
}

/* ============ 章节锚点 ============ */
.rail {
  position: sticky;
  top: 108px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.rail__link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: var(--text-sm);
  letter-spacing: .04em;
  color: var(--color-ink-soft);
  transition: color .2s ease;
}
.rail__link::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background-color: var(--color-line);
  transition: background-color .2s ease;
}
.rail__link:hover { color: var(--color-primary); }
.rail__link.is-active { color: var(--color-primary); font-weight: 600; }
.rail__link.is-active::before { background-color: var(--color-primary); }

/* ============ 原位展开 ============ */
.expand-panel { padding-top: var(--space-3); }

/* ============ 显现 ============ */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .4s ease, transform .4s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ============ 头部 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(10px);
  transition: box-shadow .3s ease;
}
.site-header[data-condensed] { box-shadow: var(--shadow-1); }
.progress-track {
  position: absolute; left: 0; right: 0; top: 0; z-index: 2;
  height: 2px;
  background-color: transparent;
}
.progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width .12s linear;
}
.header-top {
  overflow: hidden;
  max-height: 280px;
  background-image: linear-gradient(118deg, var(--color-primary-soft) 0%, var(--color-highlight) 48%, var(--color-surface-alt) 100%);
  transition: max-height .3s ease, opacity .3s ease;
}
.site-header[data-condensed] .header-top { max-height: 0; opacity: 0; }
.header-top__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  padding-block: var(--space-3);
}
.header-brand { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.brand-mark { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark__sigil {
  width: 26px; height: 26px;
  border-radius: 9px;
  background-image: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: var(--shadow-1);
}
.brand-mark__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: .05em;
}
.header-brand__line {
  font-size: var(--text-xs);
  letter-spacing: .08em;
  color: var(--color-ink-soft);
}
.header-pulse {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .04em;
  color: var(--color-ink-soft);
}
.pulse-dot {
  flex: none;
  width: 8px; height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  animation: pulse-soft 2.4s ease-in-out infinite;
}
@keyframes pulse-soft {
  0%, 100% { opacity: .38; transform: scale(.85); }
  50% { opacity: 1; transform: scale(1.1); }
}
.header-update {
  justify-self: end;
  max-width: 20ch;
  text-align: right;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .06em;
  color: var(--color-ink-muted);
}
.header-nav { background-color: var(--color-surface); }
.header-nav__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 62px;
}
.nav-caption {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--color-primary);
  white-space: nowrap;
}
.site-nav { margin-left: auto; }
.site-nav__list { display: flex; flex-wrap: wrap; gap: 2px; }
.site-nav a {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  letter-spacing: .03em;
  color: var(--color-ink-soft);
  transition: color .2s ease, background-color .2s ease;
}
.site-nav a::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background-color: transparent;
  transition: background-color .2s ease;
}
.site-nav a:hover { color: var(--color-primary); background-color: color-mix(in srgb, var(--color-primary-soft) 65%, transparent); }
.site-nav a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
  background-color: var(--color-primary-soft);
}
.site-nav a[aria-current="page"]::before { background-color: var(--color-primary); }
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: .04em;
}
.nav-toggle__bars {
  position: relative;
  width: 16px; height: 2px;
  border-radius: 2px;
  background-color: currentColor;
}
.nav-toggle__bars::before, .nav-toggle__bars::after {
  content: "";
  position: absolute; left: 0;
  width: 16px; height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform .2s ease, top .2s ease;
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* ============ 页脚 ============ */
.site-footer { margin-top: var(--space-8); color: var(--color-ink); }
.footer-stair { position: relative; }
.footer-stair--brand {
  padding-block: var(--space-8) var(--space-6);
  background-image: linear-gradient(120deg, var(--color-primary-soft) 0%, var(--color-highlight) 55%, var(--color-surface-alt) 100%);
}
.footer-stair__inner { display: grid; gap: var(--space-2); max-width: var(--measure); }
.footer-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: .05em;
  color: var(--color-primary);
}
.footer-brand__line {
  font-size: var(--text-sm);
  line-height: 1.8;
  letter-spacing: .03em;
  color: var(--color-ink-soft);
}
.footer-stair--index {
  padding-block: var(--space-8) var(--space-6);
  background-color: var(--color-surface-alt);
}
.footer-index {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}
.footer-index__col { min-width: 0; }
.footer-index__title {
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.footer-index__list { display: grid; gap: var(--space-2); }
.footer-index__list a {
  font-size: var(--text-sm);
  letter-spacing: .03em;
  color: var(--color-ink-soft);
  transition: color .2s ease;
}
.footer-index__list a:hover { color: var(--color-primary); }
.footer-stair--legal {
  margin-top: var(--space-6);
  padding-block: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.footer-legal { display: grid; gap: var(--space-3); }
.footer-legal__links { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.footer-legal__links a {
  font-size: var(--text-sm);
  letter-spacing: .04em;
  color: var(--color-contrast-ink);
  transition: color .2s ease;
}
.footer-legal__links a:hover { color: var(--color-contrast-accent); }
.footer-legal p {
  font-size: var(--text-xs);
  line-height: 1.9;
  letter-spacing: .04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}
.footer-legal__record { font-family: var(--font-mono); }
.footer-legal__copy {
  margin-top: var(--space-2);
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent) !important;
}

/* ============ 响应式：平板 ============ */
@media (max-width: 1080px) {
  .header-top__inner { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); }
  .header-update { grid-column: 1 / -1; justify-self: start; max-width: none; text-align: left; }
}
@media (max-width: 980px) {
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8, .span-9 { grid-column: span 12; }
  .hero-split { grid-template-columns: 1fr; }
  .rail { position: static; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    margin-left: 0;
    padding: var(--space-3);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open] { display: block; }
  .site-nav__list { flex-direction: column; gap: 2px; }
  .site-nav a { width: 100%; border-radius: var(--radius-sm); font-size: var(--text-base); }
  .header-nav__inner { flex-wrap: wrap; }
}
@media (max-width: 760px) {
  .header-top__inner { grid-template-columns: 1fr; gap: var(--space-2); padding-block: var(--space-2); }
  .footer-index { grid-template-columns: 1fr; gap: var(--space-6); }
}
/* ============ 响应式：手机 ============ */
@media (max-width: 640px) {
  .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-3); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9 { grid-column: span 4; }
  .section { padding-block: calc(var(--section-y) * .7); }
  .section--lg { padding-block: calc(var(--section-y-lg) * .62); }
  .media-block__body { min-height: 220px; }
  .footer-legal__links { gap: var(--space-3); }
  .hero-visual { min-height: 220px; }
}

/* ============ 减少动效 ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .pulse-dot { animation: none; opacity: 1; transform: none; }
  .hero-visual { animation: none; }
  .progress-bar { transition: none; }
  .header-top { transition: none; }
  .btn { transition: none; }
  .btn:hover { transform: none; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}