:root {
  --color-surface: #fbfbfb;
  --color-surface-alt: #f2f2f3;
  --color-surface-deep: #e6e5e7;
  --color-ink: #4f4653;
  --color-ink-soft: #766a7b;
  --color-ink-muted: #827788;
  --color-line: #dcdadd;
  --color-primary: #9e2ad5;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #eedef6;
  --color-accent: #4d33cc;
  --color-accent-ink: #ffffff;
  --color-highlight: #dcd7f3;
  --color-focus: #4526d9;
  --color-contrast-surface: #211527;
  --color-contrast-ink: #e6e4e7;
  --color-contrast-line: #4c4351;
  --color-contrast-accent: #8674dc;
  --overlay-scrim: linear-gradient(180deg, rgba(33, 21, 39, 0.35) 0%, rgba(33, 21, 39, 0.72) 55%, rgba(33, 21, 39, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 12.9px;
  --text-sm: 15.5px;
  --text-base: 17px;
  --text-lg: 20.4px;
  --text-xl: 24.5px;
  --text-2xl: 29.4px;
  --text-3xl: 35.3px;
  --text-4xl: 42.3px;
  --text-display: clamp(38px, 7.9vw, 101px);
  --text-figure: clamp(32px, 5.7vw, 73px);
  --weight-heading: 770;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.2;
  --tracking-heading: -0.004em;
  --radius-sm: 14px;
  --radius-md: 14px;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(79, 70, 83, 0.08);
  --shadow-2: 0 18px 44px rgba(79, 70, 83, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 72ch;
  --gutter: 24px;
  --section-y: 82px;
  --section-y-lg: 115px;
}

/* ============ reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg, video { max-width: 100%; display: block; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.22em; }
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  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;
}
p { margin: 0 0 var(--space-2); }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0 0 var(--space-2); padding-left: 1.25em; }
button, input, select, textarea { font: inherit; color: inherit; }
code, kbd, samp, pre, .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 4px;
}
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============ 容器与栅格 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-10 { grid-column: span 10; }
.span-12 { grid-column: span 12; }
.stack-2 { display: grid; gap: var(--space-2); align-content: start; }
.stack-3 { display: grid; gap: var(--space-3); align-content: start; }
.stack-4 { display: grid; gap: var(--space-4); align-content: start; }

/* ============ 区块 ============ */
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--deep h1, .section--deep h2, .section--deep h3, .section--deep h4 { color: var(--color-contrast-ink); }
.section--deep p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }
.section--deep a:not(.btn) { color: var(--color-contrast-accent); }
.section--deep .rule,
.section--deep .rule--double { border-color: var(--color-contrast-line); }

/* ============ 印刷式分隔线 ============ */
.rule {
  height: 0;
  margin: 0;
  border: 0;
  border-top: calc(var(--border-thin) * 3) solid var(--color-line);
}
.rule--thin { border-top-width: var(--border-thin); }
.rule--double {
  height: 4px;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
  background: transparent;
}
.rule--accent { border-top-color: var(--color-primary); }

/* ============ 跳过链接 ============ */
.skip-link {
  position: fixed;
  top: 0;
  left: var(--space-2);
  z-index: 200;
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-120%);
  transition: transform 0.2s ease;
}
.skip-link:hover { text-decoration: none; color: var(--color-primary-ink); }
.skip-link:focus {
  transform: translateY(0);
  color: var(--color-primary-ink);
}

/* ============ 头部 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

/* 上层：品牌说明条 */
.utility-bar {
  overflow: hidden;
  max-height: 72px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  transition: max-height 0.28s ease, opacity 0.2s ease;
}
.utility-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 48px;
  padding-block: var(--space-1);
}
.utility-bar__brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  min-width: 0;
  margin: 0;
}
.utility-bar__name {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  color: var(--color-primary-ink);
  white-space: nowrap;
}
.utility-bar__line {
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}
.utility-bar__note {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
  white-space: nowrap;
}
.live-dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-contrast-accent) 28%, transparent);
}
[data-scrolled] .utility-bar {
  max-height: 0;
  opacity: 0;
}

/* 下层：栏目导航 */
.nav-bar {
  position: relative;
  background-color: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(10px);
}
.nav-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 68px;
  transition: min-height 0.24s ease;
}
[data-scrolled] .nav-bar__inner { min-height: 56px; }

.site-nav {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-nav__link {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease;
}
.site-nav__link:hover {
  color: var(--color-ink);
  background-color: var(--color-surface-alt);
  text-decoration: none;
}
.site-nav__link[aria-current="page"] {
  position: relative;
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
  font-weight: 600;
}
.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--color-primary);
}
.site-nav__actions { display: flex; align-items: center; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}
.nav-cta::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-primary);
}
.nav-cta:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  text-decoration: none;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
}
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
}
.nav-toggle[aria-expanded="true"] {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.btn:hover { text-decoration: none; }
.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface)); }
.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--accent:hover { background-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface)); }
.btn--outline {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}
.btn--ghost {
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
}
.btn--ghost:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}
.section--deep .btn--outline {
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.section--deep .btn--outline:hover {
  border-color: var(--color-contrast-accent);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 24%, transparent);
  color: var(--color-primary-ink);
}

/* ============ 面包屑 ============ */
.breadcrumb { padding-block: var(--space-3) 0; }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.breadcrumb__list li { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumb__list li + li::before {
  content: "/";
  color: var(--color-line);
  font-family: var(--font-mono);
}
.breadcrumb__list a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.breadcrumb__list a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* ============ 文字 ============ */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.section--deep .eyebrow { color: var(--color-contrast-accent); }
.lead {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.65;
  color: var(--color-ink-soft);
}
.section--deep .lead { color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent); }
.text-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0;
}
.prose { max-width: var(--measure); }
.prose h2 { margin-top: var(--space-6); font-size: var(--text-xl); }
.prose h3 { margin-top: var(--space-4); font-size: var(--text-lg); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin-bottom: var(--space-1); }
.prose--deep { color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent); }
.prose--deep h2, .prose--deep h3 { color: var(--color-contrast-ink); }

/* ============ 分组标题条带 ============ */
.section-heading {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.section-heading__rule {
  height: 6px;
  border-radius: var(--radius-pill);
  background-image: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    var(--color-primary-soft) 58%,
    color-mix(in srgb, var(--color-highlight) 55%, transparent) 100%
  );
  clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
}
.section-heading__title {
  margin: 0;
  font-size: var(--text-2xl);
}
.section-heading__desc {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}
.section--deep .section-heading__desc { color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent); }

/* ============ 卡片 / 面板 ============ */
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover {
  border-color: color-mix(in srgb, var(--color-primary) 28%, transparent);
  box-shadow: var(--shadow-2);
}
.card__title {
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
}
.card__meta {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.card__note {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.card--deep {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 6%, var(--color-contrast-surface));
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.card--deep .card__title { color: var(--color-contrast-ink); }
.card--deep .card__meta { color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent); }
.card--tint {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.panel {
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
}
.panel--tint {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 20%, transparent);
}
.panel--deep {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.panel--deep h2, .panel--deep h3 { color: var(--color-contrast-ink); }
.panel--deep p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }

/* 关键视觉渐变 */
.gradient-key {
  background-image:
    radial-gradient(120% 130% at 8% -12%, color-mix(in srgb, var(--color-primary) 30%, transparent) 0%, transparent 60%),
    radial-gradient(90% 120% at 94% 6%, color-mix(in srgb, var(--color-contrast-accent) 34%, transparent) 0%, transparent 64%),
    linear-gradient(158deg, var(--color-surface) 0%, var(--color-primary-soft) 54%, var(--color-highlight) 100%);
}

/* ============ 标签 ============ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--color-highlight);
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.7;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.tag--primary {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}
.tag--deep {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 26%, transparent);
  color: var(--color-contrast-ink);
}

/* ============ 数据概览 ============ */
.stat {
  display: grid;
  gap: 4px;
  align-content: start;
}
.stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}
.stat__unit {
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-muted);
}
.stat__label {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.stat--accent .stat__value { color: var(--color-accent); }
.section--deep .stat__value { color: var(--color-contrast-accent); }
.section--deep .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.section--deep .stat__unit { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

/* ============ 图片容器 ============ */
.media-frame {
  padding: var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}
.media-frame__inner {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: calc(var(--radius-md) - 4px);
  background-image: linear-gradient(158deg, var(--color-surface-deep) 0%, var(--color-highlight) 100%);
}
.media-frame__inner > img,
.media-frame__inner > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame__scrim {
  position: absolute;
  inset: 0;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}
.media-frame__body {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  color: var(--color-contrast-ink);
}
.media-frame__body h3 { margin: 0 0 var(--space-1); color: var(--color-contrast-ink); }
.media-frame__body p { margin: 0; font-size: var(--text-sm); color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }
.media-frame__caption {
  padding: var(--space-1) 4px 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.media-frame--wide .media-frame__inner { aspect-ratio: 21 / 9; }
.media-frame--tall .media-frame__inner { aspect-ratio: 4 / 5; }
.media-frame--square .media-frame__inner { aspect-ratio: 1 / 1; }
.media-frame--plain {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}
.media-frame--plain .media-frame__inner { border-radius: var(--radius-md); }
.section--deep .media-frame {
  border-color: var(--color-contrast-line);
  background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, var(--color-contrast-surface));
}

/* ============ 数据表 ============ */
.table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
}
.data-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.data-table caption {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.data-table th {
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-surface-deep);
  border-bottom: var(--border-thin) solid var(--color-line);
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.data-table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table tbody tr:hover td { background-color: var(--color-highlight); }
.data-table tbody tr:hover td:first-child { box-shadow: inset 3px 0 0 var(--color-accent); }
.data-table .num { font-family: var(--font-mono); }
.section--deep .table-wrap {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 6%, var(--color-contrast-surface));
  border-color: var(--color-contrast-line);
}
.section--deep .data-table th {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 10%, var(--color-contrast-surface));
  border-color: var(--color-contrast-line);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}
.section--deep .data-table td {
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.section--deep .data-table tbody tr:hover td {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 18%, transparent);
}

/* ============ 筛选胶囊 ============ */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.chip[aria-pressed="true"],
.chip[data-active] {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 40%, transparent);
  color: var(--color-primary);
  font-weight: 600;
}
.section--deep .chip {
  background-color: transparent;
  border-color: var(--color-contrast-line);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}
.section--deep .chip[aria-pressed="true"] {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 26%, transparent);
  border-color: var(--color-contrast-accent);
  color: var(--color-primary-ink);
}

/* ============ 术语展开 ============ */
.term {
  margin: 0 0 var(--space-2);
  padding: var(--space-1) 0;
  border-bottom: var(--border-thin) dashed var(--color-line);
}
.term > summary {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
}
.term > summary::-webkit-details-marker { display: none; }
.term > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-ink-muted);
}
.term[open] > summary::after { content: "–"; }
.term__body {
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ============ 页脚 ============ */
.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.site-footer::before {
  content: "";
  display: block;
  height: calc(var(--border-thin) * 3);
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 52%, var(--color-contrast-accent) 100%);
}
.footer-ruler {
  height: 18px;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-contrast-line) 0 1px,
    transparent 1px 36px
  );
  background-size: auto 9px;
  background-position: 0 100%;
  background-repeat: repeat;
}
.footer-main {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-6) var(--space-4);
  padding-block: var(--space-8);
}
.footer-col { min-width: 0; }
.footer-col__title {
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}
.footer-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-list a {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-list a:hover {
  color: var(--color-primary-ink);
  border-bottom-color: var(--color-contrast-accent);
}
.footer-list--plain li {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}
.footer-note {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}
.footer-filing {
  margin: var(--space-2) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-3) var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer-bottom p { margin: 0; }
.footer-bottom__brand { font-family: var(--font-heading); letter-spacing: 0.04em; }
.footer-bottom__meta { font-family: var(--font-mono); }

/* ============ 滚动显现 ============ */
[data-reveal] {
  opacity: 0;
  transform: translate3d(0, 12px, 0);
  transition: opacity 280ms ease, transform 300ms cubic-bezier(0.22, 0.65, 0.3, 1);
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}
.reveal-fallback [data-reveal] {
  opacity: 1;
  transform: none;
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .footer-main { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .span-3 { grid-column: span 6; }
  .span-4 { grid-column: span 6; }
  .span-5 { grid-column: span 12; }
  .span-7 { grid-column: span 12; }
  .span-8 { grid-column: span 12; }
  .span-9 { grid-column: span 12; }
  .span-10 { grid-column: span 12; }
}

@media (max-width: 900px) {
  :root { --section-y: 64px; --section-y-lg: 84px; }
  .utility-bar__line { display: none; }
  .nav-bar__inner { min-height: 60px; }
  [data-scrolled] .nav-bar__inner { min-height: 54px; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 90;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: var(--space-2);
    padding: var(--space-2) 0 var(--space-4);
    background-color: var(--color-surface);
    border-bottom: calc(var(--border-thin) * 3) solid var(--color-line);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open] { display: flex; }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding-inline: var(--gutter);
  }
  .site-nav__link {
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
  }
  .site-nav__link[aria-current="page"]::after { display: none; }
  .site-nav__actions { padding-inline: var(--gutter); }
  .nav-cta { justify-content: center; width: 100%; padding: var(--space-2); }
  .span-2, .span-3, .span-4, .span-6 { grid-column: span 12; }
}

@media (max-width: 640px) {
  .utility-bar__inner { min-height: 44px; }
  .utility-bar__note { font-size: 11.5px; }
  .footer-ruler { background-size: auto 7px; }
  .footer-main {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-4);
    padding-block: var(--space-6);
  }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .section-heading__rule { clip-path: polygon(0 0, 100% 0, calc(100% - 14px) 100%, 0 100%); }
  .data-table { min-width: 480px; }
}

@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;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .card:hover { box-shadow: var(--shadow-1); }
}