:root {
  --color-surface: #fdfdfd;
  --color-surface-alt: #f4f4f4;
  --color-surface-deep: #e7e8e8;
  --color-ink: #434c4b;
  --color-ink-soft: #657170;
  --color-ink-muted: #7a8584;
  --color-line: #dcdddd;
  --color-primary: #178279;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #ddeceb;
  --color-accent: #8e7410;
  --color-accent-ink: #ffffff;
  --color-highlight: #e9e4d2;
  --color-focus: #8c7108;
  --color-contrast-surface: #122322;
  --color-contrast-ink: #e4e7e7;
  --color-contrast-line: #404e4d;
  --color-contrast-accent: #e5bb1a;
  --overlay-scrim: linear-gradient(180deg, rgba(18, 35, 34, 0.35) 0%, rgba(18, 35, 34, 0.72) 55%, rgba(18, 35, 34, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 10.1px;
  --text-sm: 14.3px;
  --text-base: 17px;
  --text-lg: 24.0px;
  --text-xl: 34.0px;
  --text-2xl: 48.1px;
  --text-3xl: 68.0px;
  --text-4xl: 96.1px;
  --text-display: clamp(51px, 10.4vw, 133px);
  --text-figure: clamp(42px, 7.5vw, 96px);
  --weight-heading: 856;
  --weight-body: 400;
  --leading-body: 1.78;
  --leading-heading: 1.16;
  --tracking-heading: -0.015em;
  --radius-sm: 11px;
  --radius-md: 16px;
  --radius-lg: 21px;
  --radius-pill: 999px;
  --border-thin: 2px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(67, 76, 75, 0.12);
  --shadow-2: 0 2px 0 rgba(67, 76, 75, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1280px;
  --measure: 66ch;
  --gutter: 16px;
  --section-y: 73px;
  --section-y-lg: 102px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

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

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

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

button { font: inherit; }

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

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); letter-spacing: 0; }
h5, h6 { font-size: var(--text-sm); }

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

small, .meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: 0.94em;
  letter-spacing: 0.01em;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { color: color-mix(in srgb, var(--color-primary) 74%, var(--color-ink)); }

strong, b { font-weight: var(--weight-heading); }

hr, .divider {
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  margin: var(--space-3) 0;
}

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

:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 5px;
}

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

/* ===== skip link ===== */
.skip-link {
  position: fixed;
  top: var(--space-1);
  left: var(--space-1);
  z-index: 999;
  transform: translateY(-180%);
  padding: 12px 22px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: transform 160ms ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  color: var(--color-contrast-ink);
}

/* ===== header / 左侧轨道 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.site-header :focus-visible { outline-color: var(--color-contrast-accent); }

.header-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--space-3);
}

.header-brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px 0;
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  text-decoration: none;
  line-height: 1;
}

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

.brand-name { display: inline-block; }

.brand-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 11px 5px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.14em;
  line-height: 1;
}

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

/* 移动抽屉按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 16px;
  background: transparent;
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease;
}

.nav-toggle:hover {
  background: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  border-color: var(--color-contrast-accent);
}

.nav-toggle[aria-expanded="true"] {
  background: var(--color-primary);
  border-color: var(--color-contrast-accent);
  color: var(--color-primary-ink);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: var(--border-thin);
  background: currentColor;
  border-radius: var(--radius-pill);
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: var(--border-thin);
  background: currentColor;
  border-radius: var(--radius-pill);
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

/* 导航 */
.site-nav { position: relative; z-index: 1; }

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 16px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: 1.2;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

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

.nav-link[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-contrast-accent);
}

.nav-index {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

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

.nav-label { display: inline-block; }

/* 轨道底部信息条 */
.track-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.track-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-contrast-accent);
}

.track-sep {
  flex: 0 0 auto;
  width: var(--border-thin);
  height: 10px;
  background: var(--color-contrast-line);
}

.header-deco { display: none; }

.header-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: var(--border-thin);
  background: var(--color-contrast-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

@media (max-width: 1023px) {
  .site-nav { display: none; }

  .site-nav[data-open] {
    display: block;
    margin-top: var(--space-2);
    padding-top: var(--space-2);
    border-top: var(--border-thin) solid var(--color-contrast-line);
  }
}

@media (min-width: 1024px) {
  body { padding-left: 272px; }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 272px;
    height: 100vh;
    overflow: hidden;
    border-bottom: 0;
    border-right: var(--border-thin) solid var(--color-contrast-line);
  }

  .header-track {
    height: 100%;
    max-width: none;
    padding: var(--space-4) var(--space-3) var(--space-3);
    gap: var(--space-4);
  }

  .nav-toggle { display: none; }

  .site-nav {
    display: block;
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .nav-link { font-size: var(--text-base); }

  .track-foot { margin-top: auto; }

  .header-deco {
    display: block;
    position: absolute;
    right: 0;
    top: 42%;
    width: 8px;
    height: 96px;
    background: var(--color-primary);
    opacity: 0.85;
    clip-path: polygon(0 0, 100% 12px, 100% calc(100% - 12px), 0 100%);
    pointer-events: none;
  }
}

/* ===== footer ===== */
.site-footer {
  position: relative;
  margin-top: var(--space-8);
  background: var(--color-primary-soft);
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 40%, transparent);
  color: var(--color-ink);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-6) var(--space-3) var(--space-4);
}

.footer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.footer-head .brand-mark { font-size: var(--text-lg); color: var(--color-ink); }
.footer-head .brand-mark:hover { color: var(--color-primary); }

.footer-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-soft);
}

.footer-belt {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--color-primary) 55%, transparent) transparent;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.belt-list {
  display: flex;
  flex-wrap: nowrap;
  gap: var(--space-6);
  min-width: max-content;
  padding: 0 0 var(--space-3);
}

.belt-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 34ch;
}

.belt-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-accent);
}

.belt-value {
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.footer-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  color: var(--color-ink-muted);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer-legal a {
  color: var(--color-ink);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 50%, transparent);
}

.footer-legal a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
}

.footer-meta { margin: 0; }

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

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

.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.prose > p + h2,
.prose > p + h3 { margin-top: var(--space-6); }

.measure-sm { max-width: 46ch; }

/* 底色轮换工具 */
.surface { background: var(--color-surface); }
.surface-alt { background: var(--color-surface-alt); }
.surface-deep { background: var(--color-surface-deep); }

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

.surface-primary :is(h1, h2, h3, h4, h5, h6) { color: var(--color-primary-ink); }

.surface-primary-soft { background: var(--color-primary-soft); }

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

.surface-contrast :is(h1, h2, h3, h4, h5, h6) { color: var(--color-contrast-ink); }

.surface-contrast .section-head,
.surface-contrast .divider,
.surface-contrast hr { border-color: var(--color-contrast-line); }

.surface-contrast a { color: var(--color-contrast-accent); }

.is-hit { background: var(--color-highlight); }

/* ===== 区块起手式 ===== */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.section-title {
  margin: 0;
  font-size: var(--text-xl);
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

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

.section-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.surface-contrast .section-note { color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 13px 24px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

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

.btn--primary:hover {
  background: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}

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

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

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

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

.btn--quiet {
  background: var(--color-surface-alt);
  color: var(--color-ink);
  border-color: var(--color-line);
}

/* ===== 标签 / 徽标 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: var(--border-thin) solid currentColor;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  line-height: 1.5;
  white-space: nowrap;
}

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

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

.tag--quiet {
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  border-color: var(--color-line);
}

.tag--highlight {
  background: var(--color-highlight);
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 45%, transparent);
}

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

/* ===== 卡片 ===== */
.card {
  position: relative;
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}

.card--flat { box-shadow: none; }

.card--accent {
  border-color: color-mix(in srgb, var(--color-primary) 45%, transparent);
  box-shadow: var(--shadow-2);
}

.surface-contrast .card {
  background: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

/* 错位叠压的纸卡层次 */
.layer-card {
  position: relative;
  isolation: isolate;
}

.layer-card::before {
  content: "";
  position: absolute;
  inset: 12px -12px -12px 12px;
  background: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  z-index: 0;
}

.layer-card > * { position: relative; z-index: 1; }

/* 斜切面板：内部不再使用圆角 */
.panel--bevel {
  border-radius: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

/* ===== 图片容器（去边直角，直接贴合内容边界）===== */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border-radius: 0;
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-deep);
}

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

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--3x2 { aspect-ratio: 3 / 2; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }

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

.media-frame > .media-caption {
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: var(--space-2);
  z-index: 2;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
}

.media-note {
  margin: var(--space-1) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.breadcrumb li + li::before {
  content: "/";
  color: color-mix(in srgb, var(--color-accent) 70%, transparent);
}

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

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

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

/* ===== 栅格 ===== */
.grid-8 {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: var(--space-2);
}

.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }

@media (max-width: 1023px) {
  .grid-8 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .col-3, .col-4 { grid-column: span 2; }
  .col-5, .col-6, .col-8 { grid-column: span 4; }
}

@media (max-width: 639px) {
  .grid-8 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-2, .col-3, .col-4, .col-5, .col-6, .col-8 { grid-column: span 2; }
}

/* ===== 索引表 ===== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  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: 0.12em;
  color: var(--color-ink-muted);
}

.data-table th,
.data-table td {
  padding: 12px var(--space-2);
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.data-table thead th {
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  font-weight: 400;
}

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

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

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

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

/* ===== 标签页 / 分段切换 ===== */
.tabs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.surface-contrast .tabs-list { border-bottom-color: var(--color-contrast-line); }

.tab {
  appearance: none;
  padding: 9px 20px;
  background: transparent;
  color: var(--color-ink-soft);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1.3;
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

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

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

.tab-panel { padding-top: var(--space-3); }
.tab-panel[hidden] { display: none; }

/* ===== 显现动效 ===== */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}

html.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
  transition: opacity 320ms ease-out, transform 320ms ease-out;
}

/* ===== 动效偏好 ===== */
@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; }
}

@media (prefers-reduced-motion: no-preference) {
  @keyframes tab-enter {
    from { opacity: 0; transform: translateX(8px); }
    to { opacity: 1; transform: none; }
  }

  .tab-panel:not([hidden]) { animation: tab-enter 160ms ease-out both; }
}

/* ===== 移动端微调 ===== */
@media (max-width: 639px) {
  .footer-inner { padding: var(--space-6) var(--space-3) var(--space-3); gap: var(--space-3); }
  .belt-list { gap: var(--space-4); }
  .footer-foot { gap: var(--space-1) var(--space-2); }
  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }
}