:root {
  --color-surface: #f2f2f1;
  --color-surface-alt: #ebeae9;
  --color-surface-deep: #e0e0de;
  --color-ink: #5e5950;
  --color-ink-soft: #736e64;
  --color-ink-muted: #878278;
  --color-line: #d7d6d4;
  --color-primary: #81745a;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e2e0dc;
  --color-accent: #ab633a;
  --color-accent-ink: #ffffff;
  --color-highlight: #e5d8d0;
  --color-focus: #a6572b;
  --color-contrast-surface: #171614;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #454442;
  --color-contrast-accent: #be6e41;
  --overlay-scrim: linear-gradient(180deg, rgba(23, 22, 20, 0.35) 0%, rgba(23, 22, 20, 0.72) 55%, rgba(23, 22, 20, 0.92) 100%);
  --font-heading: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-body: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.4px;
  --text-sm: 14.3px;
  --text-base: 16px;
  --text-lg: 20.0px;
  --text-xl: 25.0px;
  --text-2xl: 31.2px;
  --text-3xl: 39.1px;
  --text-4xl: 48.8px;
  --text-display: clamp(34px, 6.6vw, 84px);
  --text-figure: clamp(28px, 4.7vw, 60px);
  --weight-heading: 466;
  --weight-body: 400;
  --leading-body: 1.96;
  --leading-heading: 1.27;
  --tracking-heading: 0.003em;
  --radius-sm: 1px;
  --radius-md: 1px;
  --radius-lg: 1px;
  --radius-pill: 1px;
  --border-thin: 1px;
  --border-thick: 1px;
  --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: 1080px;
  --measure: 67ch;
  --gutter: 16px;
  --section-y: 106px;
  --section-y-lg: 148px;
}

/* ==========================================================================
   1. 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);
  letter-spacing: 0;
  min-height: 100vh;
  overflow-x: hidden;
}

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

h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, pre { margin: 0; }

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

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

a { color: inherit; text-decoration: none; transition: color 200ms ease; }

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

:focus-visible {
  outline: 1px solid var(--color-focus);
  outline-offset: 3px;
}

::selection {
  background-color: var(--color-highlight);
  color: var(--color-ink);
}

/* ==========================================================================
   2. 排版基础
   ========================================================================== */
.type-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.04;
  letter-spacing: -0.012em;
}

.type-figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-body);
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-ink-muted);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background-color: var(--color-primary);
  flex: none;
}

.lead {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.72;
  color: var(--color-ink-soft);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: var(--measure);
  margin-block-end: var(--space-8);
}

.section-head__title { font-size: var(--text-2xl); }

.section-head__note {
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.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;
}

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

.container--narrow { max-width: 760px; }

.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: var(--color-surface-alt); }

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

.section--dark .eyebrow { color: var(--color-contrast-accent); }
.section--dark .lead { color: var(--color-contrast-ink); }
.section--dark .section-head__note { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.section--dark .rule { background-color: var(--color-contrast-line); }

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

.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: 1 / -1; }

.shift-1 { margin-inline-start: 8.333%; }
.shift-2 { margin-inline-start: 16.666%; }

.rule {
  height: 1px;
  background-color: var(--color-line);
  border: 0;
  margin: 0;
}

@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-4, .col-5, .col-7, .col-8 { grid-column: 1 / -1; }
  .col-6 { grid-column: span 6; }
  .shift-1, .shift-2 { margin-inline-start: 0; }
}

@media (max-width: 600px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: 1 / -1; }
}

/* ==========================================================================
   4. 正文长文块
   ========================================================================== */
.prose {
  max-width: var(--measure);
  color: var(--color-ink);
}

.prose > * + * { margin-block-start: var(--space-3); }

.prose h2 {
  font-size: var(--text-xl);
  margin-block-start: var(--space-8);
}

.prose h3 {
  font-size: var(--text-lg);
  margin-block-start: var(--space-6);
}

.prose p { line-height: var(--leading-body); }

.prose a {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.32em;
}

.prose a:hover {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

.prose ul,
.prose ol { display: flex; flex-direction: column; gap: var(--space-1); }

.prose li {
  position: relative;
  padding-inline-start: 1.5em;
}

.prose li::before {
  content: "—";
  position: absolute;
  inset-inline-start: 0;
  color: var(--color-primary);
}

.prose blockquote {
  padding-inline-start: var(--space-4);
  border-inline-start: 1px solid var(--color-primary);
  color: var(--color-ink-soft);
  font-size: var(--text-lg);
}

.section--dark .prose { color: var(--color-contrast-ink); }
.section--dark .prose a { color: var(--color-contrast-ink); text-decoration-color: var(--color-contrast-accent); }
.section--dark .prose blockquote { border-inline-start-color: var(--color-contrast-accent); color: var(--color-contrast-ink); }

/* ==========================================================================
   5. 按钮与链接
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 11px var(--space-4);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--color-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  line-height: 1.2;
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}

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

.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) 82%, var(--color-contrast-surface));
  border-color: transparent;
  color: var(--color-primary-ink);
}

.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) 82%, var(--color-contrast-surface));
  border-color: transparent;
  color: var(--color-accent-ink);
}

.btn--on-dark {
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.btn--on-dark:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 20%, transparent);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding-block-end: 3px;
  border-block-end: 1px solid var(--color-line);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  transition: color 200ms ease, border-color 200ms ease;
}

.link-more::after {
  content: "→";
  transition: transform 200ms ease;
}

.link-more:hover {
  color: var(--color-accent);
  border-block-end-color: var(--color-accent);
}

.link-more:hover::after { transform: translateX(4px); }

/* ==========================================================================
   6. 标签、徽标、面包屑
   ========================================================================== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  line-height: 1.8;
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.tag--accent {
  background-color: color-mix(in srgb, var(--color-accent) 14%, var(--color-surface));
  color: var(--color-accent);
}

.tag--outline {
  background-color: transparent;
  border: 1px solid var(--color-line);
  color: var(--color-ink-muted);
}

.tag--dark {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  color: var(--color-contrast-ink);
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 24px;
  padding-inline: 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink-soft);
}

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

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

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

.breadcrumb li + li::before {
  content: "／";
  margin-inline: 8px;
  color: color-mix(in srgb, var(--color-ink-muted) 55%, transparent);
}

.breadcrumb a { color: var(--color-ink-muted); }
.breadcrumb a:hover { color: var(--color-accent); }

/* ==========================================================================
   7. 图片容器
   ========================================================================== */
.figure {
  margin: 0;
  padding: var(--space-2);
  background-color: var(--color-surface-alt);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
}

.figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-sm);
}

.figure__media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.78) contrast(1.03);
}

.figure--wide .figure__media { aspect-ratio: 21 / 9; }
.figure--tall .figure__media { aspect-ratio: 4 / 5; }

.figure__caption {
  margin-block-start: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.media-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--space-1);
  padding: var(--space-3);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
}

.media-overlay__label {
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  color: var(--color-contrast-accent);
}

/* ==========================================================================
   8. 数据表
   ========================================================================== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table th,
.data-table td {
  padding: 10px var(--space-2);
  text-align: start;
  border-block-end: 1px solid var(--color-line);
  vertical-align: baseline;
}

.data-table thead th {
  background-color: var(--color-surface-alt);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

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

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

.section--dark .data-table th,
.section--dark .data-table td { border-block-end-color: var(--color-contrast-line); }

.section--dark .data-table thead th { background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent); color: var(--color-contrast-ink); }
.section--dark .data-table tbody tr:nth-child(even) { background-color: color-mix(in srgb, var(--color-contrast-ink) 5%, transparent); }

/* ==========================================================================
   9. 分段切换
   ========================================================================== */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  border-block-end: 1px solid var(--color-line);
}

.tab {
  position: relative;
  margin-block-end: -1px;
  padding: var(--space-2) 0;
  border-block-end: 1px solid transparent;
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  transition: color 200ms ease, border-color 200ms ease;
}

.tab:hover { color: var(--color-ink); }

.tab[aria-selected="true"] {
  color: var(--color-ink);
  border-block-end-color: var(--color-accent);
}

.tab-panel { padding-block-start: var(--space-6); }
.tab-panel[hidden] { display: none; }

.section--dark .tabs { border-block-end-color: var(--color-contrast-line); }
.section--dark .tab { color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent); }
.section--dark .tab:hover,
.section--dark .tab[aria-selected="true"] { color: var(--color-contrast-ink); }
.section--dark .tab[aria-selected="true"] { border-block-end-color: var(--color-contrast-accent); }

/* ==========================================================================
   10. Skip link
   ========================================================================== */
.skip-link {
  position: fixed;
  inset-block-start: var(--space-2);
  inset-inline-start: var(--space-2);
  z-index: 300;
  padding: 10px var(--space-3);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  transform: translateY(-180%);
  transition: transform 200ms ease;
}

.skip-link:focus { transform: none; color: var(--color-contrast-ink); }

/* ==========================================================================
   11. 头部：桌面端左侧轨道 / 移动端抽屉
   ========================================================================== */
.site-header {
  z-index: 120;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  background-color: var(--color-surface);
  color: var(--color-ink);
}

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

.brand {
  display: inline-block;
  align-self: flex-start;
  padding-block-end: 6px;
  border-block-end: 1px solid var(--color-line);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.16em;
  color: var(--color-ink);
}

.brand:hover { color: var(--color-accent); }

.brand__tagline {
  font-size: var(--text-xs);
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.nav-toggle { display: none; }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  width: 14px;
  flex: none;
}

.nav-toggle__bars > span {
  display: block;
  height: 1px;
  background-color: currentColor;
  transition: transform 200ms ease, opacity 200ms ease;
}

.nav-toggle__label {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__list a {
  position: relative;
  display: block;
  padding: 7px 0 7px 12px;
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
  transition: color 200ms ease;
}

.site-nav__list a::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-start: 50%;
  width: 1px;
  height: 0;
  background-color: var(--color-primary);
  transform: translateY(-50%);
  transition: height 220ms ease, background-color 220ms ease;
}

.site-nav__list a:hover { color: var(--color-ink); }

.site-nav__list a:hover::before,
.site-nav__list a[aria-current="page"]::before { height: calc(100% - 12px); }

.site-nav__list a[aria-current="page"] { color: var(--color-ink); }

.site-nav__list a[aria-current="page"]::before { background-color: var(--color-accent); }

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

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.control-group__label {
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  color: var(--color-ink-muted);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  padding: 5px 9px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  line-height: 1.5;
  color: var(--color-ink-soft);
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}

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

.chip[aria-pressed="true"] {
  background-color: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
  color: var(--color-ink);
}

/* 桌面端：常驻左侧轨道 */
@media (min-width: 1024px) {
  body { padding-inline-start: 172px; }

  .site-header {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    width: 172px;
    padding: var(--space-6) var(--space-4) var(--space-8);
    border-inline-end: 1px solid var(--color-line);
    overflow-y: auto;
  }
}

/* 移动端：顶部细条 + 右侧抽屉 */
@media (max-width: 1023px) {
  body { padding-block-start: 56px; }

  .site-header {
    position: fixed;
    inset-block-start: 0;
    inset-inline: 0;
    min-height: 56px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: 0 var(--space-3);
    border-block-end: 1px solid var(--color-line);
    background-color: color-mix(in srgb, var(--color-surface) 94%, transparent);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }

  .site-header__identity {
    flex-direction: row;
    align-items: center;
    gap: var(--space-2);
  }

  .brand { border-block-end: 0; padding-block-end: 0; }
  .brand__tagline { display: none; }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 7px 10px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-sm);
    color: var(--color-ink-soft);
    transition: color 200ms ease, border-color 200ms ease;
  }

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

  .nav-toggle[data-open] .nav-toggle__bars > span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
  .nav-toggle[data-open] .nav-toggle__bars > span:nth-child(2) { opacity: 0; }
  .nav-toggle[data-open] .nav-toggle__bars > span:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

  .site-nav {
    position: fixed;
    inset-block: 56px 0;
    inset-inline-end: 0;
    width: min(86vw, 340px);
    padding: var(--space-6) var(--space-4) var(--space-8);
    background-color: var(--color-surface);
    border-inline-start: 1px solid var(--color-line);
    overflow-y: auto;
    transform: translateX(102%);
    visibility: hidden;
    transition: transform 240ms ease, visibility 240ms ease;
  }

  .nav-toggle[data-open] ~ .site-nav {
    transform: none;
    visibility: visible;
  }

  html[data-nav-open] { overflow: hidden; }

  .site-nav__list a {
    padding: 11px 0 11px 14px;
    font-size: var(--text-lg);
    letter-spacing: 0.14em;
  }

  .site-nav__list a:hover::before,
  .site-nav__list a[aria-current="page"]::before { height: calc(100% - 20px); }
}

/* ==========================================================================
   12. 页脚：同色延续，错位三列
   ========================================================================== */
.site-footer {
  margin-block-start: var(--space-8);
  padding-block: var(--space-8) var(--space-6);
  border-block-start: 1px solid var(--color-line);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-6) var(--gutter);
}

.site-footer__col {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.site-footer__col--brand { grid-column: 1 / span 4; }
.site-footer__col:nth-child(2) { grid-column: 6 / span 3; }
.site-footer__col:nth-child(3) { grid-column: 9 / span 4; }

.site-footer__brand {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  color: var(--color-ink);
}

.site-footer__note {
  max-width: 34ch;
  font-size: var(--text-sm);
  line-height: 1.85;
  color: var(--color-ink-muted);
}

.site-footer__label {
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  color: var(--color-ink-muted);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__list li,
.site-footer__list a {
  font-size: var(--text-sm);
  line-height: 1.75;
  letter-spacing: 0.05em;
  color: var(--color-ink-soft);
}

.site-footer__list a:hover { color: var(--color-accent); }

.site-footer__list--contact li:not(:first-child) {
  color: var(--color-ink-muted);
  word-break: break-word;
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  margin-block-start: var(--space-8);
  padding-block-start: var(--space-4);
  border-block-start: 1px solid var(--color-line);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.site-footer__legal a { color: var(--color-ink-soft); }
.site-footer__legal a:hover { color: var(--color-accent); }

.site-footer__meta {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.site-footer__disclaimer {
  margin-block-start: var(--space-3);
  font-size: var(--text-xs);
  line-height: 1.75;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

@media (max-width: 1023px) {
  .site-footer__inner { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .site-footer__col--brand { grid-column: 1 / span 6; }
  .site-footer__col:nth-child(2) { grid-column: 1 / span 3; }
  .site-footer__col:nth-child(3) { grid-column: 4 / span 3; }
}

@media (max-width: 640px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .site-footer__col--brand,
  .site-footer__col:nth-child(2),
  .site-footer__col:nth-child(3) { grid-column: 1 / -1; }
}

/* ==========================================================================
   13. 滚动显现
   ========================================================================== */
html[data-reveal-ready] [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 240ms ease, transform 240ms ease;
}

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

/* ==========================================================================
   14. 无障碍动效降级
   ========================================================================== */
@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[data-reveal-ready] [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .site-nav { transition: none; }
  .skip-link { transition: none; }
}