/* /assets/site.css — 慧星体育 共享外壳样式 */

:root {
  --color-surface: #fcfdfd;
  --color-surface-alt: #f3f4f4;
  --color-surface-deep: #e6e7e9;
  --color-ink: #464953;
  --color-ink-soft: #6a6f7b;
  --color-ink-muted: #777b88;
  --color-line: #dbddde;
  --color-primary: #345acb;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e0e6f6;
  --color-accent: #1e7f8b;
  --color-accent-ink: #ffffff;
  --color-highlight: #d4e6e8;
  --color-focus: #147e8a;
  --color-contrast-surface: #191e2c;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #464a55;
  --color-contrast-accent: #2dc1d2;
  --overlay-scrim: linear-gradient(180deg, rgba(25, 30, 44, 0.35) 0%, rgba(25, 30, 44, 0.72) 55%, rgba(25, 30, 44, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 10.7px;
  --text-sm: 13.4px;
  --text-base: 15px;
  --text-lg: 18.8px;
  --text-xl: 23.4px;
  --text-2xl: 29.3px;
  --text-3xl: 36.6px;
  --text-4xl: 45.8px;
  --text-display: clamp(35px, 7.1vw, 91px);
  --text-figure: clamp(29px, 5.2vw, 66px);
  --weight-heading: 715;
  --weight-body: 400;
  --leading-body: 1.71;
  --leading-heading: 1.17;
  --tracking-heading: 0.021em;
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-pill: 0px;
  --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: 1220px;
  --measure: 67ch;
  --gutter: 32px;
  --section-y: 85px;
  --section-y-lg: 119px;
}

/* ============================================================
   1. Reset 与基础
   ============================================================ */

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

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

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);
  background-image: radial-gradient(color-mix(in srgb, var(--color-line) 78%, transparent) 1px, transparent 1px);
  background-size: 22px 22px;
  background-position: 0 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

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

ul, ol { margin: 0 0 var(--space-3); padding-left: 1.2em; }

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

figure { margin: 0; }

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

table { border-collapse: collapse; }

a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 42%, transparent);
  transition: color 200ms ease, border-color 200ms ease, background-color 200ms ease;
}

a:hover { color: var(--color-focus); border-bottom-color: var(--color-focus); }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

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

/* ============================================================
   2. 通用工具：容器 / 网格 / 标注 / 分节
   ============================================================ */

.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.mono-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.16em;
  line-height: 1.6;
  color: var(--color-ink-muted);
}

.coord {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.coord::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 1px;
  background: currentColor;
}

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

.section--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: calc(var(--border-thin) * 3) solid var(--color-contrast-line);
  border-bottom: calc(var(--border-thin) * 3) solid var(--color-contrast-line);
  background-image: none;
}

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

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

.section--contrast .coord,
.section--contrast .mono-label { color: var(--color-contrast-accent); }

.rule-double {
  position: relative;
  height: 0;
  margin: var(--space-6) 0;
  border-top: var(--border-thin) solid var(--color-ink);
}

.rule-double::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 4px;
  border-top: var(--border-thin) dotted var(--color-line);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-6);
  border-bottom: calc(var(--border-thin) * 3) solid var(--color-ink);
}

.section-head__title {
  margin: 0;
  font-size: var(--text-2xl);
  letter-spacing: -0.01em;
}

.section-head__lead {
  margin: 0;
  max-width: 46ch;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.grid {
  display: grid;
  gap: var(--gutter);
}

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

.grid--12 > .span-3 { grid-column: span 3; }
.grid--12 > .span-4 { grid-column: span 4; }
.grid--12 > .span-5 { grid-column: span 5; }
.grid--12 > .span-6 { grid-column: span 6; }
.grid--12 > .span-7 { grid-column: span 7; }
.grid--12 > .span-8 { grid-column: span 8; }
.grid--12 > .span-9 { grid-column: span 9; }

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

.prose > p + p { margin-top: var(--space-3); }
.prose strong { font-weight: 700; color: var(--color-ink); }
.prose em { font-style: normal; color: var(--color-primary); }
.prose h2 { margin-top: var(--space-6); font-size: var(--text-2xl); }
.prose h3 { margin-top: var(--space-4); font-size: var(--text-xl); }
.prose ul,
.prose ol { max-width: var(--measure); }

/* ============================================================
   3. 跳转链接与阅读进度条
   ============================================================ */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 300;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-contrast-ink);
  background-color: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-contrast-accent);
  border-bottom: var(--border-thin) solid var(--color-contrast-accent);
}

.skip-link:focus {
  left: 8px;
  top: 8px;
  color: var(--color-contrast-ink);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 200;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-contrast-accent) 100%);
  pointer-events: none;
}

/* ============================================================
   4. 报头
   ============================================================ */

.site-header {
  position: relative;
  z-index: 40;
  background-color: var(--color-surface);
  background-image: none;
  border-bottom: calc(var(--border-thin) * 3) solid var(--color-contrast-surface);
}

.header-bar {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  background-image: linear-gradient(90deg,
    color-mix(in srgb, var(--color-contrast-accent) 16%, transparent) 0%,
    transparent 42%);
}

.header-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 40px;
  padding-block: 6px;
}

.header-bar__label {
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 3px 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
  border-bottom: var(--border-thin) dotted var(--color-contrast-line);
}

.header-cta:hover {
  color: var(--color-contrast-ink);
  border-bottom-style: solid;
  border-bottom-color: var(--color-contrast-accent);
}

.header-cta__mark {
  display: inline-block;
  padding: 1px 6px;
  font-size: var(--text-xs);
  color: var(--color-contrast-surface);
  background-color: var(--color-contrast-accent);
}

.masthead {
  padding-block: clamp(28px, 6vw, 54px) clamp(20px, 4vw, 34px);
}

.masthead__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-align: center;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  border-bottom: 0;
}

.brand:hover { color: var(--color-primary); border-bottom: 0; }

.brand__name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(var(--text-3xl), 8vw, var(--text-4xl));
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: inherit;
}

.brand__meta {
  color: var(--color-ink-muted);
  letter-spacing: 0.22em;
}

.masthead__coord {
  position: relative;
  padding-top: var(--space-2);
  letter-spacing: 0.2em;
}

.masthead__coord::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(280px, 52vw);
  border-top: var(--border-thin) dotted var(--color-line);
}

/* ============================================================
   5. 主导航
   ============================================================ */

.site-nav {
  position: relative;
  background-color: var(--color-surface-alt);
}

.site-nav__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(12px, 3vw, 28px);
  padding-block: 10px 12px;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.nav-ruler {
  flex: 1 1 0;
  max-width: 180px;
  height: 1px;
  background-image: repeating-linear-gradient(to right,
    var(--color-line) 0 4px,
    transparent 4px 11px);
}

.nav-list {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: clamp(10px, 2.6vw, 36px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item { list-style: none; }

.nav-link {
  display: inline-block;
  padding: 8px 2px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) dotted transparent;
  transition: color 200ms ease, border-color 200ms ease, font-weight 200ms ease;
}

.nav-link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  border-bottom-style: solid;
}

.nav-link[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 700;
  border-bottom: calc(var(--border-thin) * 2) solid var(--color-primary);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-ink);
  background-color: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-contrast-line);
  cursor: pointer;
  transition: color 200ms ease, border-color 200ms ease, background-color 200ms ease;
}

.nav-toggle:hover {
  color: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
}

.nav-toggle__icon {
  position: relative;
  display: inline-block;
  width: 14px;
  height: 8px;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: top 200ms ease, transform 200ms ease;
}

.nav-toggle__icon::before { top: 0; }
.nav-toggle__icon::after { top: 6px; }

.site-nav[data-open] .nav-toggle__icon::before { top: 3px; transform: rotate(45deg); }
.site-nav[data-open] .nav-toggle__icon::after { top: 3px; transform: rotate(-45deg); }

/* ============================================================
   6. 按钮 / 链接 / 面包屑
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
  background-color: transparent;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: 0;
  cursor: pointer;
  transition: color 200ms ease, background-color 200ms ease, border-color 200ms ease;
}

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

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

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

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

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

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

.btn--ghost-on-dark:hover {
  color: var(--color-contrast-surface);
  background-color: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-primary);
  border-bottom: var(--border-thin) dotted color-mix(in srgb, var(--color-primary) 55%, transparent);
}

.link-arrow::after {
  content: "→";
  display: inline-block;
  transition: transform 200ms ease;
}

.link-arrow:hover {
  color: var(--color-focus);
  border-bottom-style: solid;
}

.link-arrow:hover::after { transform: translateX(3px); }

.breadcrumbs { padding-top: var(--space-3); }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__item::after {
  content: "/";
  color: color-mix(in srgb, var(--color-ink-muted) 55%, transparent);
}

.breadcrumbs__item:last-child::after { content: none; }

.breadcrumbs__link {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) dotted transparent;
}

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

/* ============================================================
   7. 面板 / 卡片 / 标签 / 图片容器 / 数据表
   ============================================================ */

.panel {
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
}

.panel--cold {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 26%, transparent);
}

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

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

.card {
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) dotted var(--color-line);
  transition: border-color 200ms ease, border-style 200ms ease, background-color 200ms ease;
}

.card:hover {
  border-style: solid;
  border-color: var(--color-primary);
  background-color: color-mix(in srgb, var(--color-primary-soft) 42%, var(--color-surface));
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
  background-color: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
}

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

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

.tag--highlight {
  color: var(--color-accent);
  background-color: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 34%, transparent);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-line);
}

.media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.06);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(155deg,
    color-mix(in srgb, var(--color-primary) 48%, transparent) 0%,
    color-mix(in srgb, var(--color-contrast-surface) 58%, transparent) 100%);
  mix-blend-mode: multiply;
}

.media-frame--clean::after { content: none; }

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

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

.media-frame__overlay p { margin: 0; color: var(--color-contrast-ink); }

.media-frame__overlay .mono-label { color: var(--color-contrast-accent); }

.figure { margin: 0; }

.figure__caption {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.data-table {
  width: 100%;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
}

.data-table caption {
  caption-side: top;
  padding-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-align: left;
  color: var(--color-ink-muted);
}

.data-table th,
.data-table td {
  padding: 11px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.data-table thead th {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  background-color: var(--color-surface-deep);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.data-table tbody tr { transition: background-color 160ms ease; }

.data-table tbody tr:hover { background-color: var(--color-highlight); }

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

.data-table--cold { background-color: var(--color-primary-soft); }

/* ============================================================
   8. 页脚
   ============================================================ */

.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-surface-alt);
  background-image: none;
  border-top: calc(var(--border-thin) * 3) solid var(--color-contrast-surface);
  color: var(--color-ink);
}

.site-footer > .wrap {
  padding-block: var(--space-8) var(--space-4);
}

.footer__masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.footer__brand {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-2xl);
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1.7fr 1fr 1fr;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.footer-panel {
  position: relative;
  padding: var(--space-3);
  background-color: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
}

.footer-panel::after {
  content: "";
  position: absolute;
  left: 5px;
  right: 5px;
  top: 4px;
  border-top: var(--border-thin) dotted var(--color-line);
  pointer-events: none;
}

.footer-panel__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-lg);
  letter-spacing: 0.01em;
}

.footer-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
}

.footer-list__item { list-style: none; }

.footer-list__link {
  display: block;
  padding: 6px 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) dotted transparent;
  transition: color 200ms ease, border-color 200ms ease;
}

.footer-list__link:hover {
  color: var(--color-primary);
  border-bottom-style: solid;
  border-bottom-color: var(--color-primary);
}

.footer-contact {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-contact__row {
  display: grid;
  gap: 3px;
  list-style: none;
}

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.footer-contact__value {
  font-size: var(--text-sm);
  color: var(--color-ink);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) dotted var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.footer-legal__copy { margin: 0; }

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-legal__link {
  padding-bottom: 2px;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) dotted var(--color-line);
}

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

/* ============================================================
   9. 显现动效
   ============================================================ */

.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease, transform 420ms ease;
}

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

/* ============================================================
   10. 响应式
   ============================================================ */

@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .site-nav__inner {
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 8px;
    padding-block: 8px 10px;
  }

  .nav-ruler { display: none; }

  .nav-toggle {
    display: inline-flex;
    order: 1;
    margin-left: auto;
  }

  .nav-list {
    order: 2;
    flex: 0 0 100%;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    display: none;
    margin-top: 6px;
    border-top: var(--border-thin) dotted var(--color-line);
  }

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

  .nav-item { border-bottom: var(--border-thin) dotted var(--color-line); }

  .nav-link {
    display: block;
    padding: 14px 4px;
    font-size: var(--text-base);
    letter-spacing: 0.05em;
    border-bottom: 0;
  }

  .nav-link:hover { border-bottom: 0; }

  .nav-link[aria-current="page"] {
    padding-left: 14px;
    border-bottom: 0;
    border-left: calc(var(--border-thin) * 3) solid var(--color-primary);
  }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid--12 > [class*="span-"] { grid-column: span 6; }

  .section-head { align-items: flex-start; }
}

@media (max-width: 760px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer__masthead { flex-direction: column; align-items: flex-start; }
  .masthead__coord::before { width: 60vw; }
}

@media (max-width: 520px) {
  .header-bar__inner { flex-wrap: wrap; row-gap: 4px; }
  .footer-legal { justify-content: flex-start; }
  .footer-legal__links { gap: var(--space-2); }
}

@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;
  }

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

  .scroll-progress { transition: none; }
}