:root {
  --color-surface: #2b282c;
  --color-surface-alt: #39363b;
  --color-surface-deep: #4b474d;
  --color-ink: #ccc4cf;
  --color-ink-soft: #a192a5;
  --color-ink-muted: #85748b;
  --color-line: #484449;
  --color-primary: #ba2de7;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #3f2946;
  --color-accent: #c2de21;
  --color-accent-ink: #161118;
  --color-highlight: #46492a;
  --color-focus: #cbeb14;
  --color-contrast-surface: #f6f5f6;
  --color-contrast-ink: #3a353b;
  --color-contrast-line: #cdcbcd;
  --color-contrast-accent: #657311;
  --overlay-scrim: linear-gradient(180deg, rgba(246, 245, 246, 0.35) 0%, rgba(246, 245, 246, 0.72) 55%, rgba(246, 245, 246, 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: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(50px, 10.2vw, 131px);
  --text-figure: clamp(41px, 7.3vw, 94px);
  --weight-heading: 602;
  --weight-body: 400;
  --leading-body: 1.82;
  --leading-heading: 1.18;
  --tracking-heading: -0.003em;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 0 0 1px rgba(194, 222, 33, 0.35);
  --shadow-2: 0 0 28px rgba(194, 222, 33, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1140px;
  --measure: 68ch;
  --gutter: 16px;
  --section-y: 111px;
  --section-y-lg: 155px;
}

/* ============================================================
   01 · Reset 与中文排版基线
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

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

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

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

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

p { margin: 0 0 var(--space-2); max-width: var(--measure); }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

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

:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================================
   02 · 文本层级：展示字号 / 标题 / 等宽标签
   ============================================================ */
.display-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.figure-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-figure);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.title-lg { font-size: var(--text-3xl); }
.title-md { font-size: var(--text-2xl); }
.title-sm { font-size: var(--text-xl); }

.prose {
  max-width: var(--measure);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.prose p { margin: 0; }

.prose h3 {
  font-size: var(--text-xl);
  margin-top: var(--space-2);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--color-primary);
  box-shadow: 0 0 12px color-mix(in srgb, var(--color-primary) 70%, transparent);
}

.label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 4px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.label--primary {
  color: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
}

.label--accent {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 50%, transparent);
}

.label--invert {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.rule {
  height: var(--border-thin);
  border: 0;
  margin: 0;
  background: var(--color-line);
}

/* ============================================================
   03 · 布局：容器 / 区块节奏 / 栅格
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.container--narrow { max-width: 820px; }

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-8); }

.section--alt {
  background: color-mix(in srgb, var(--color-surface-alt) 72%, var(--color-surface));
}

.section--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.section + .section {
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-line) 70%, transparent);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 62ch;
  margin-bottom: var(--space-6);
}

.section-title { font-size: var(--text-2xl); text-wrap: balance; }

.section-lede {
  margin: 0;
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.section--contrast :is(h1, h2, h3, h4) { color: var(--color-contrast-ink); }

.section--contrast .section-lede,
.section--contrast .panel-text {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.section--contrast .eyebrow { color: var(--color-contrast-accent); }

.section--contrast .eyebrow::before {
  background: var(--color-contrast-accent);
  box-shadow: none;
}

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

.grid > * { grid-column: span var(--span, 12); }

.grid--auto {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid--auto > * { grid-column: auto; }

/* ============================================================
   04 · 组件：框体 / 指标 / 标签切换 / 滑杆
   ============================================================ */
.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface-alt) 92%, transparent);
}

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

.panel--glow {
  border-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
  box-shadow: var(--shadow-1);
}

.panel--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.panel--contrast :is(h1, h2, h3, h4) { color: var(--color-contrast-ink); }

.panel-title { font-size: var(--text-xl); }

.panel-text {
  margin: 0;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-3xl);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.stat-name {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.chip {
  padding: 6px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

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

.chip[aria-pressed="true"],
.chip[aria-selected="true"] {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-ink);
}

.chip--invert {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-deep);
  cursor: pointer;
}

.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent);
  border: var(--border-thick) solid var(--color-accent-ink);
}

.range::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent);
  border: var(--border-thick) solid var(--color-accent-ink);
}

.range:focus-visible { outline-offset: 6px; }

/* ============================================================
   05 · 图片容器（直角去边，叠字必须走 overlay）
   ============================================================ */
.media {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: 0;
  background: var(--color-surface-deep);
}

.media-frame--framed { border: var(--border-thin) solid var(--color-line); }

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--16x9 .media-frame { aspect-ratio: 16 / 9; }
.media--4x3 .media-frame { aspect-ratio: 4 / 3; }
.media--1x1 .media-frame { aspect-ratio: 1 / 1; }
.media--21x9 .media-frame { aspect-ratio: 21 / 9; }

.media-overlay {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.media-caption {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.media-caption--overlay {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
}

/* ============================================================
   06 · 面包屑 / 按钮
   ============================================================ */
.breadcrumb { margin-bottom: var(--space-4); }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.breadcrumb-link {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.breadcrumb-link:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-primary);
}

.breadcrumb-sep { color: var(--color-ink-muted); }

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

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 10px var(--space-3);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.cta-primary {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 22%, transparent);
}

.cta-primary:hover {
  background: var(--color-primary);
  box-shadow: var(--shadow-2);
}

.cta-ghost {
  border-color: var(--color-line);
  color: var(--color-ink-soft);
}

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

.cta-contrast {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

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

/* ============================================================
   07 · 显现动效状态
   ============================================================ */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   08 · 头部：移动端顶栏 + 抽屉，桌面端侧边轨道
   ============================================================ */
.skip-link {
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 200;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transform: translateY(-200%);
  transition: transform 0.18s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
}

.header-rail {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: color-mix(in srgb, var(--color-surface-alt) 97%, transparent);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-top {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  min-width: 0;
}

.brand-mark {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-primary);
  padding-left: var(--space-1);
  border-left: var(--border-thick) solid var(--color-primary);
  white-space: nowrap;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  color: var(--color-ink);
  white-space: nowrap;
}

.brand:hover .brand-mark {
  color: var(--color-primary-ink);
  background: var(--color-primary);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 6px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}

.nav-toggle:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.nav-toggle-box {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle-line {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--color-ink-soft);
  transition: transform 0.18s ease, background 0.18s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:first-child {
  transform: translateY(3px) rotate(45deg);
  background: var(--color-accent);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:last-child {
  transform: translateY(-3px) rotate(-45deg);
  background: var(--color-accent);
}

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.nav-link::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--color-line);
  transition: background 0.18s ease, box-shadow 0.18s ease;
}

.nav-link:hover {
  background: color-mix(in srgb, var(--color-surface-deep) 70%, transparent);
  border-color: var(--color-line);
  color: var(--color-ink);
}

.nav-link[aria-current="page"] {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 60%, transparent);
  color: var(--color-ink);
}

.nav-link[aria-current="page"]::before {
  background: var(--color-accent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--color-accent) 80%, transparent);
}

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

.nav-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.nav-text {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
}

.nav-utility {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.nav-utility-link {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  transition: color 0.18s ease;
}

.nav-utility-link:hover { color: var(--color-primary); }

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--border-thick);
  z-index: 120;
  background: color-mix(in srgb, var(--color-line) 60%, transparent);
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--color-accent);
  box-shadow: 0 0 12px color-mix(in srgb, var(--color-accent) 70%, transparent);
  transition: width 0.1s linear;
}

@media (max-width: 1023.98px) {
  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(86vw, 340px);
    z-index: 95;
    padding: 88px var(--space-3) var(--space-6);
    overflow-y: auto;
    background: color-mix(in srgb, var(--color-surface-deep) 96%, transparent);
    backdrop-filter: blur(16px);
    border-right: var(--border-thin) solid var(--color-primary);
    box-shadow: 0 24px 64px color-mix(in srgb, var(--color-surface) 82%, transparent);
    transform: translateX(-102%);
    transition: transform 0.24s ease;
  }

  .site-nav[data-open="true"] { transform: translateX(0); }
}

@media (min-width: 1024px) {
  body { padding-left: 248px; }

  .scroll-progress { left: 248px; }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 248px;
  }

  .header-rail {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-6);
    height: 100%;
    padding: var(--space-6) var(--space-3) var(--space-4);
    border-bottom: 0;
    border-right: var(--border-thin) solid var(--color-line);
    overflow-y: auto;
  }

  .header-top {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .brand {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .brand-name { font-size: var(--text-lg); }

  .nav-toggle { display: none; }

  .site-nav { flex: 1 1 auto; }

  .nav-cta {
    width: 100%;
    margin-top: auto;
  }
}

/* ============================================================
   09 · 页脚：四面板卡片
   ============================================================ */
.site-footer {
  padding-block: var(--space-8) var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface-alt) 70%, var(--color-surface));
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
}

.footer-mark {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-primary);
  padding-left: var(--space-1);
  border-left: var(--border-thick) solid var(--color-primary);
}

.footer-tagline {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gutter);
}

.footer-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface-deep) 55%, transparent);
}

.footer-panel-title {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer-list-plain li {
  display: flex;
  gap: var(--space-2);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.footer-link {
  align-self: flex-start;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer-link:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-primary);
}

.footer-label {
  flex: 0 0 auto;
  min-width: 3.4em;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.footer-value { color: var(--color-ink); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.footer-note {
  flex: 1 1 320px;
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.footer-legal-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.footer-legal-nav .footer-link {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
}

.footer-legal {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.to-top {
  padding: 6px 14px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, transparent);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.to-top:hover {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-accent);
}

@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .span-4 { --span: 4; }
  .span-5 { --span: 5; }
  .span-6 { --span: 6; }
  .span-7 { --span: 7; }
  .span-8 { --span: 8; }
  .span-12 { --span: 12; }
}

@media (min-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ============================================================
   10 · 减少动态效果
   ============================================================ */
@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;
  }

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

  .site-nav { transition: none; }
}