:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #efefef;
  --color-surface-deep: #e1e1e0;
  --color-ink: #2d352c;
  --color-ink-soft: #536151;
  --color-ink-muted: #6e7f6c;
  --color-line: #d4d6d4;
  --color-primary: #37842f;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dee9dd;
  --color-accent: #922dd2;
  --color-accent-ink: #ffffff;
  --color-highlight: #e6d4f2;
  --color-focus: #9520df;
  --color-contrast-surface: #141e13;
  --color-contrast-ink: #e4e7e4;
  --color-contrast-line: #424a41;
  --color-contrast-accent: #ae63de;
  --overlay-scrim: linear-gradient(180deg, rgba(20, 30, 19, 0.35) 0%, rgba(20, 30, 19, 0.72) 55%, rgba(20, 30, 19, 0.92) 100%);
  --font-heading: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", 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(41px, 8.5vw, 109px);
  --text-figure: clamp(34px, 6.1vw, 78px);
  --weight-heading: 794;
  --weight-body: 400;
  --leading-body: 1.71;
  --leading-heading: 1.26;
  --tracking-heading: 0.002em;
  --radius-sm: 0px;
  --radius-md: 3px;
  --radius-lg: 6px;
  --radius-pill: 6px;
  --border-thin: 1px;
  --border-thick: 2px;
  --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: 1340px;
  --measure: 71ch;
  --gutter: 32px;
  --section-y: 99px;
  --section-y-lg: 139px;
}

/* ============================================================
   1. 重置与基础排版
   ============================================================ */
*,
*::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;
}

body.nav-open { overflow: hidden; }

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

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

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);
}

p { margin: 0 0 var(--space-3); }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0; padding: 0; }

a {
  color: var(--color-primary);
  text-underline-offset: 3px;
  text-decoration-thickness: var(--border-thin);
}

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

/* 反相区块内的焦点环 */
.split__aside :focus-visible,
.section--deep :focus-visible,
.site-header:not([data-scrolled]) :focus-visible {
  outline-color: var(--color-contrast-accent);
}

/* ============================================================
   2. 布局原语
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

@media (min-width: 720px) {
  .container { padding-inline: var(--space-4); }
}

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

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

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

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

.section--deep .rule { border-top-color: var(--color-contrast-line); }

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

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1000px) {
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.stack > * + * { margin-top: var(--space-3); }
.stack--loose > * + * { margin-top: var(--space-4); }

/* ============================================================
   3. 分屏系统（本站唯一结构语法）
   ============================================================ */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.split__aside {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-8) var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.5;
  letter-spacing: 0.004em;
}

.split__main {
  background-color: var(--color-surface);
  color: var(--color-ink);
  padding: var(--section-y) var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

@media (min-width: 720px) {
  .split__aside,
  .split__main { padding-inline: var(--space-6); }
}

@media (min-width: 1000px) {
  .split { grid-template-columns: var(--split-cols, 5fr 7fr); }
  .split__aside {
    border-right: var(--border-thin) solid var(--color-contrast-line);
  }
  .split__aside > * { max-width: 46ch; }
  .split__main > * { max-width: var(--measure); }
}

.split--wide-aside { --split-cols: 7fr 5fr; }

.split--flip { --split-cols: 7fr 5fr; }

@media (min-width: 1000px) {
  .split--flip .split__aside {
    order: 2;
    border-right: 0;
    border-left: var(--border-thin) solid var(--color-contrast-line);
  }
  .split--flip .split__main { order: 1; }
}

/* ============================================================
   4. 文字与排版工具
   ============================================================ */
.display-type {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.94;
  letter-spacing: -0.022em;
  margin: 0;
}

.figure-type {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  font-size: var(--text-figure);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.eyebrow {
  display: block;
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

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

.lede {
  font-size: var(--text-lg);
  line-height: 1.55;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.section--deep .lede,
.split__aside .lede { color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent); }

.prose {
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.prose h2,
.prose h3 { color: var(--color-ink); }
.prose h2 { font-size: var(--text-xl); margin: var(--space-6) 0 var(--space-2); }
.prose h3 { font-size: var(--text-lg); margin: var(--space-4) 0 var(--space-2); }

.heading-2 { font-size: var(--text-2xl); }
.heading-3 { font-size: var(--text-xl); }

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

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

/* ============================================================
   5. 按钮与链接
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 0 var(--space-3);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 240ms ease, border-color 240ms ease, color 240ms ease;
}

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

.btn--primary:hover {
  background-color: color-mix(in srgb, var(--color-primary) 78%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-primary) 78%, var(--color-contrast-surface));
}

.btn--accent {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--accent:hover {
  background-color: color-mix(in srgb, var(--color-accent) 78%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-accent) 78%, var(--color-contrast-surface));
}

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

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

.btn--contrast {
  background-color: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.btn--contrast:hover {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 18%, transparent);
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
}

/* ============================================================
   6. 标签徽标与指标块
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.tag--primary {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 32%, var(--color-primary-soft));
  color: color-mix(in srgb, var(--color-primary) 82%, var(--color-ink));
}

.tag--accent {
  background-color: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 28%, var(--color-highlight));
  color: color-mix(in srgb, var(--color-accent) 84%, var(--color-ink));
}

.tag--contrast {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 16%, transparent);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-accent);
}

.stat {
  display: block;
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.section--deep .stat,
.split__aside .stat { border-top-color: var(--color-contrast-line); }

.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: var(--color-accent);
}

.section--deep .stat__value,
.split__aside .stat__value { color: var(--color-contrast-accent); }

.stat__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.section--deep .stat__label,
.split__aside .stat__label {
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* ============================================================
   7. 图片容器
   ============================================================ */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-sm);
}

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

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
}

/* ============================================================
   8. 数据表
   ============================================================ */
.data-table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  -webkit-overflow-scrolling: touch;
}

.section--deep .data-table-wrap,
.split__aside .data-table-wrap { border-color: var(--color-contrast-line); }

.data-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table th,
.data-table td {
  padding: var(--space-2) var(--space-3);
  min-height: 44px;
  text-align: left;
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: top;
}

.data-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background-color: var(--color-surface-deep);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.data-table tbody tr:nth-child(even) td { background-color: var(--color-surface-alt); }

.section--deep .data-table th,
.section--deep .data-table td,
.split__aside .data-table th,
.split__aside .data-table td { border-bottom-color: var(--color-contrast-line); }

.section--deep .data-table thead th,
.split__aside .data-table thead th {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, var(--color-contrast-surface));
  color: var(--color-contrast-ink);
}

.section--deep .data-table tbody tr:nth-child(even) td,
.split__aside .data-table tbody tr:nth-child(even) td {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 5%, transparent);
}

.data-table td.num,
.data-table th.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* ============================================================
   9. 筛选与面包屑
   ============================================================ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 240ms ease, border-color 240ms ease, color 240ms ease;
}

.filter-btn:hover { border-color: var(--color-primary); }

.filter-btn[aria-pressed="true"] {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: color-mix(in srgb, var(--color-primary) 84%, var(--color-ink));
}

[data-filter-item].is-hidden { display: none; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--color-primary); text-decoration: underline; }

.breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-2);
  color: var(--color-ink-muted);
}

/* ============================================================
   10. 头部
   ============================================================ */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 900;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-130%);
  transition: transform 220ms ease;
}

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

.site-header {
  --_fg: var(--color-contrast-ink);
  --_fg-soft: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
  --_bg-solid: var(--color-contrast-surface);
  --_line: var(--color-contrast-line);
  position: sticky;
  top: 0;
  z-index: 400;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 68%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--border-thin) solid transparent;
  transition: background-color 300ms ease, border-color 300ms ease;
}

.site-header[data-scrolled] {
  --_fg: var(--color-ink);
  --_fg-soft: var(--color-ink-muted);
  --_bg-solid: var(--color-surface);
  --_line: var(--color-line);
  background-color: var(--color-surface);
  border-bottom-color: var(--color-line);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.site-header__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  min-height: 72px;
}

.site-header__brand { min-width: 0; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--_fg);
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.brand__line {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--_fg-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
}

.nav__link {
  display: inline-block;
  padding: var(--space-1) 0;
  color: var(--_fg);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-decoration: none;
  border-bottom: var(--border-thick) solid transparent;
  transition: color 200ms ease, border-color 200ms ease;
}

.nav__link:hover { border-bottom-color: color-mix(in srgb, var(--_fg) 45%, transparent); }

.nav__link[aria-current="page"] {
  border-bottom-color: var(--color-primary);
}

.site-header:not([data-scrolled]) .nav__link[aria-current="page"] {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.utility-link {
  color: var(--_fg-soft);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color 200ms ease;
}

.utility-link:hover { color: var(--_fg); text-decoration: underline; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 0 var(--space-2);
  border: var(--border-thin) solid var(--_line);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--_fg);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background-color: currentColor;
  transition: transform 220ms ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child { transform: translateY(-3px) rotate(-45deg); }

.nav-toggle__label { white-space: nowrap; }

@media (min-width: 900px) {
  .site-header__inner {
    grid-template-columns: minmax(220px, 3fr) minmax(0, 9fr);
    gap: var(--space-6);
  }
}

@media (max-width: 899px) {
  .site-header {
    background-color: var(--color-contrast-surface);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .site-header[data-scrolled] { background-color: var(--color-surface); }

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

  .site-header__nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    padding-bottom: var(--space-3);
    background-color: var(--_bg-solid);
    border-bottom: var(--border-thin) solid var(--_line);
  }

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

  .nav { width: 100%; }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav__link {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border-bottom: var(--border-thin) solid var(--_line);
    border-left: var(--border-thick) solid transparent;
    font-size: var(--text-base);
  }

  .nav__link:hover { border-bottom-color: var(--_line); }

  .nav__link[aria-current="page"] {
    border-bottom-color: var(--_line);
    border-left-color: var(--color-primary);
    color: var(--color-primary);
  }

  .site-header:not([data-scrolled]) .nav__link[aria-current="page"] {
    color: var(--color-contrast-accent);
    border-left-color: var(--color-contrast-accent);
  }

  .site-header__actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-3) 0;
  }

  .utility-link {
    min-height: 44px;
    display: flex;
    align-items: center;
    font-size: var(--text-base);
  }

  .site-header__actions .btn { width: 100%; }
}

/* ============================================================
   11. 页脚
   ============================================================ */
.site-footer {
  margin-top: 0;
  padding-top: var(--section-y);
  background-color: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding-bottom: var(--space-8);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
}

.footer-brand__name {
  margin: var(--space-2) 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: -0.01em;
}

.footer-brand__line {
  max-width: 32ch;
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.footer-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.footer-col__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.footer-list,
.footer-lines {
  list-style: none;
  display: grid;
  gap: var(--space-1);
}

.footer-link {
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.7;
  text-decoration: none;
  transition: color 200ms ease;
}

.footer-link:hover { color: var(--color-primary); text-decoration: underline; }

.footer-link--inline { text-decoration: underline; }

.footer-line {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-4);
}

.footer-meta {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

@media (min-width: 720px) {
  .footer-cols { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-4); }
}

@media (min-width: 1000px) {
  .footer-top {
    grid-template-columns: 4fr 8fr;
    gap: 0;
  }

  .footer-brand {
    padding-right: var(--space-6);
    border-right: var(--border-thin) solid var(--color-line);
  }

  .footer-cols { padding-left: var(--space-6); }
}

/* ============================================================
   12. 显现动效
   ============================================================ */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 420ms ease, transform 420ms ease;
}

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

/* ============================================================
   13. 减少动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

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