:root {
  --color-surface: #ffffff;
  --color-surface-alt: #f5f5f5;
  --color-surface-deep: #e6e7e7;
  --color-ink: #2f3734;
  --color-ink-soft: #57655f;
  --color-ink-muted: #73827c;
  --color-line: #dadbda;
  --color-primary: #22865c;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e0eee8;
  --color-accent: #d813b1;
  --color-accent-ink: #ffffff;
  --color-highlight: #f8d5f1;
  --color-focus: #d507ac;
  --color-contrast-surface: #121f1a;
  --color-contrast-ink: #e4e7e6;
  --color-contrast-line: #404b47;
  --color-contrast-accent: #ec23c4;
  --overlay-scrim: linear-gradient(180deg, rgba(18, 31, 26, 0.35) 0%, rgba(18, 31, 26, 0.72) 55%, rgba(18, 31, 26, 0.92) 100%);
  --font-heading: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 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(41px, 8.4vw, 108px);
  --text-figure: clamp(34px, 6.1vw, 78px);
  --weight-heading: 689;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.2;
  --tracking-heading: -0.0em;
  --radius-sm: 0px;
  --radius-md: 2px;
  --radius-lg: 3px;
  --radius-pill: 3px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1220px;
  --measure: 70ch;
  --gutter: 24px;
  --section-y: 98px;
  --section-y-lg: 137px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 148px;
}

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);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

p, figure, blockquote, dl, dd, dt { margin: 0; }

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

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

a { color: inherit; text-decoration: none; }

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

table { border-collapse: collapse; width: 100%; }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 排版与容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.prose p + p { margin-top: var(--space-2); }
.prose h2 { margin-top: var(--space-6); font-size: var(--text-2xl); }
.prose h3 { margin-top: var(--space-4); font-size: var(--text-lg); }
.prose ul { margin-top: var(--space-2); padding-left: var(--space-3); list-style: square; }
.prose li + li { margin-top: 6px; }

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

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -120px;
  z-index: 120;
  padding: var(--space-2) var(--space-3);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  transition: top 0.2s ease;
}

.skip-link:focus { top: var(--space-2); }

/* ---------- 头部：刊头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--color-surface);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.progress-rail {
  position: relative;
  height: 3px;
  background: color-mix(in srgb, var(--color-ink) 10%, var(--color-surface));
}

.progress-bar {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 0;
  background: var(--color-accent);
  transition: width 0.12s linear;
}

.masthead {
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.masthead__inner {
  display: grid;
  grid-template-columns: minmax(0, 4fr) auto minmax(0, 3fr);
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-3);
}

.masthead__phase {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.pulse-dot {
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  animation: masthead-pulse 2.4s ease-in-out infinite;
}

@keyframes masthead-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.masthead__phase-value {
  color: var(--color-ink);
  letter-spacing: 0.08em;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding-inline: var(--space-3);
  text-align: center;
}

.brand__name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(var(--text-xl), 2.6vw, var(--text-3xl));
  line-height: 1;
  letter-spacing: 0.16em;
  color: var(--color-ink);
  transform: skewX(-4deg);
}

.brand__sub {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  color: var(--color-ink-muted);
}

.masthead__mark {
  display: flex;
  align-items: baseline;
  justify-content: flex-end;
  gap: 6px;
  justify-self: end;
  padding: var(--space-1) var(--space-2);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.masthead__mark-num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.masthead__mark-unit {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-ink);
}

.nav-bar {
  position: relative;
  display: flex;
  justify-content: center;
  padding-block: var(--space-1) 0;
}

.site-nav { width: 100%; }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
  gap: clamp(var(--space-2), 3.4vw, var(--space-6));
}

.nav-list a {
  display: block;
  padding: var(--space-2) 2px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  border-bottom: 3px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--color-ink);
  border-bottom-color: var(--color-primary);
}

.nav-list a[aria-current="page"] {
  color: var(--color-ink);
  font-weight: 700;
  border-bottom-color: var(--color-primary);
}

.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);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink);
}

.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 12px;
  border-top: var(--border-thick) solid var(--color-ink);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  border-top: var(--border-thick) solid var(--color-ink);
  transform: translateY(-1px);
}

@media (max-width: 900px) {
  .nav-bar {
    position: relative;
    justify-content: flex-start;
    padding-block: var(--space-2);
  }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: calc(var(--gutter) * -1);
    right: calc(var(--gutter) * -1);
    z-index: 20;
    background: var(--color-surface);
    border-top: var(--border-thin) solid var(--color-line);
    border-bottom: var(--border-thick) solid var(--color-primary);
  }
  .site-nav[data-open] { display: block; }
  .nav-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    padding-block: var(--space-1);
  }
  .nav-list a {
    padding: var(--space-2);
    font-size: var(--text-base);
    border-bottom: 0;
    border-left: 3px solid transparent;
  }
  .nav-list a:hover {
    border-bottom-color: transparent;
    border-left-color: var(--color-primary);
  }
  .nav-list a[aria-current="page"] {
    background: var(--color-primary-soft);
    border-bottom-color: transparent;
    border-left-color: var(--color-primary);
  }
}

@media (max-width: 720px) {
  .masthead__inner {
    grid-template-columns: 1fr auto;
    gap: var(--space-2);
    padding-block: var(--space-2);
  }
  .brand {
    order: 1;
    align-items: flex-start;
    justify-self: start;
    padding-inline: 0;
    text-align: left;
  }
  .masthead__phase {
    order: 2;
    justify-self: end;
    letter-spacing: 0.12em;
  }
  .masthead__phase-label { display: none; }
  .masthead__mark { display: none; }
}

/* ---------- 分屏骨架 ---------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  border-top: var(--border-thick) solid var(--color-ink);
}

.split--reverse { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.split--34 { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }

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

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

.split__col {
  padding-block: var(--section-y);
  padding-inline: clamp(var(--space-3), 4vw, var(--space-8));
}

@media (max-width: 900px) {
  .split,
  .split--reverse,
  .split--34 { grid-template-columns: 1fr; }
  .split__col {
    padding-block: var(--space-6);
    padding-inline: var(--gutter);
  }
}

/* ---------- 深色上下文 ---------- */
.on-deep { color: var(--color-contrast-ink); }
.on-deep h1, .on-deep h2, .on-deep h3, .on-deep h4 { color: var(--color-contrast-ink); }
.on-deep .section-head { border-top-color: var(--color-contrast-line); }
.on-deep .section-note { color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent); }
.on-deep .rule { border-top-color: var(--color-contrast-line); }
.on-deep .rule--double {
  border-top-color: var(--color-contrast-line);
  border-bottom-color: var(--color-contrast-line);
}
.on-deep .entry-list { border-top-color: var(--color-contrast-line); }
.on-deep .entry { border-bottom-color: var(--color-contrast-line); }
.on-deep .entry__detail { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
.on-deep .entry__meta { color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent); }
.on-deep .placard { color: var(--color-contrast-ink); border-left-color: var(--color-contrast-accent); }
.on-deep .stat-figure { color: var(--color-contrast-accent); }
.on-deep .prose { color: var(--color-contrast-ink); }

/* ---------- 章节 ---------- */
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }
.section--alt { background: var(--color-surface-alt); }

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--space-2) var(--space-4);
  align-items: end;
  padding-top: var(--space-3);
  margin-bottom: var(--space-6);
  border-top: var(--border-thick) solid var(--color-ink);
}

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

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

@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr; align-items: start; }
}

/* ---------- 分隔 ---------- */
.rule {
  height: 0;
  border: 0;
  border-top: var(--border-thick) solid var(--color-ink);
  margin: 0;
}

.rule--thin {
  border-top-width: var(--border-thin);
  border-top-color: var(--color-line);
}

.rule--double {
  height: 7px;
  border-top: var(--border-thick) solid var(--color-ink);
  border-bottom: var(--border-thin) solid var(--color-line);
  background: transparent;
}

/* ---------- 文字组件 ---------- */
.hero-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--text-display);
  line-height: 0.94;
  letter-spacing: -0.02em;
  transform: skewX(-3deg);
  transform-origin: left bottom;
}

.stat-figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--color-accent);
}

.figure-unit {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin-left: 6px;
}

.on-deep .figure-unit { color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }

.pull-quote {
  margin-block: var(--space-4);
  padding: var(--space-3) var(--space-4);
  max-width: 54ch;
  background: var(--color-highlight);
  border-left: 4px solid var(--color-accent);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.55;
  text-indent: 1.4em;
  color: var(--color-ink);
}

.pull-quote::before { content: "\300C"; margin-left: -1.4em; }
.pull-quote::after { content: "\300D"; }

.on-deep .pull-quote {
  background: color-mix(in srgb, var(--color-contrast-accent) 16%, var(--color-contrast-surface));
  color: var(--color-contrast-ink);
  border-left-color: var(--color-contrast-accent);
}

.placard {
  display: inline-flex;
  align-items: center;
  padding-left: var(--space-1);
  border-left: 3px solid var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  color: var(--color-ink-soft);
  text-transform: uppercase;
}

.tag {
  display: inline-block;
  padding: 3px var(--space-1);
  border: var(--border-thin) solid var(--color-line);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
}

.tag--accent { border-color: var(--color-accent); color: var(--color-accent); }
.tag--on-deep { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.breadcrumb li { display: inline-flex; align-items: center; }
.breadcrumb li::after { content: "\FF0F"; margin-left: var(--space-1); color: var(--color-line); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.breadcrumb a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.section-rail {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-block: var(--space-2);
  border-bottom: var(--border-thick) solid var(--color-ink);
  font-size: var(--text-sm);
}

.section-rail a {
  font-family: var(--font-heading);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.section-rail a:hover { color: var(--color-ink); }
.section-rail a[data-active] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

/* ---------- 条目 / 索引 ---------- */
.entry-list { border-top: var(--border-thick) solid var(--color-ink); }

.entry {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--space-1) var(--space-3);
  align-items: baseline;
  padding-block: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color 0.24s ease;
}

.entry:hover,
.entry:focus-within {
  background: color-mix(in srgb, var(--color-primary) 7%, transparent);
}

.on-deep .entry:hover,
.on-deep .entry:focus-within {
  background: color-mix(in srgb, var(--color-contrast-accent) 12%, transparent);
}

.entry__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.35;
}

.entry__meta {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.entry__detail {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

.entry:hover .entry__detail,
.entry:focus-within .entry__detail {
  max-height: 12em;
  opacity: 1;
}

@media (max-width: 720px) {
  .entry { grid-template-columns: 1fr; }
  .entry__detail { max-height: none; opacity: 1; }
}

/* ---------- 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-line);
}

.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame > img,
.media-frame > .media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg,
      var(--color-contrast-surface) 0%,
      color-mix(in srgb, var(--color-primary) 30%, var(--color-contrast-surface)) 100%);
}

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

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.media-frame__caption strong {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  letter-spacing: 0.02em;
}

/* ---------- 按钮与链接 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px var(--space-3);
  border: var(--border-thick) solid transparent;
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface)); }

.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background: color-mix(in srgb, var(--color-accent) 82%, var(--color-contrast-surface)); }

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

.btn--on-deep {
  background: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.btn--on-deep:hover {
  background: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 2px;
  border-bottom: var(--border-thick) solid var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink);
}

.link-more:hover { color: var(--color-primary); }

.on-deep .link-more { color: var(--color-contrast-ink); border-bottom-color: var(--color-contrast-accent); }
.on-deep .link-more:hover { color: var(--color-contrast-accent); }

/* ---------- 网格 ---------- */
.grid { display: grid; gap: var(--space-3); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--gap-lg { gap: var(--space-4); }

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--12 { grid-template-columns: 1fr; }
}

/* ---------- 浮动数据坞 ---------- */
.data-dock {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 55;
  width: 224px;
  padding: var(--space-2);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-left: 4px solid var(--color-contrast-accent);
  font-size: var(--text-xs);
}

.data-dock[data-collapsed] { width: auto; }

.data-dock__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
}

.data-dock__label {
  font-family: var(--font-heading);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
}

.data-dock__toggle {
  padding: 2px 6px;
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}

.data-dock__toggle:hover { border-color: var(--color-contrast-accent); }

.data-dock__body { margin-top: var(--space-1); }
.data-dock[data-collapsed] .data-dock__body { display: none; }

.data-dock__list { display: grid; gap: 6px; }

.data-dock__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: 6px;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.data-dock__num {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-contrast-accent);
}

.data-dock__set[data-dock-set]:not([data-active]) { display: none; }

@media (max-width: 560px) {
  .data-dock {
    right: var(--space-1);
    bottom: var(--space-1);
    width: 186px;
  }
}

/* ---------- 页脚：阶梯式 ---------- */
.site-footer {
  margin-top: var(--section-y);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.footer-tier { padding-block: var(--space-8); }

.footer-tier--index {
  background: var(--color-contrast-surface);
  border-top: var(--border-thick) solid var(--color-primary);
}

.footer-tier--contact {
  background: var(--color-surface-alt);
  color: var(--color-ink);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.footer-tier--legal {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 3fr) minmax(0, 5fr);
  gap: var(--space-6) var(--space-4);
}

.footer-brand__name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--text-2xl);
  letter-spacing: 0.16em;
  color: var(--color-contrast-ink);
}

.footer-brand__line {
  margin-top: var(--space-2);
  max-width: 30ch;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.footer-col__label {
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  color: var(--color-contrast-accent);
  text-transform: uppercase;
}

.footer-tier--contact .footer-col__label { color: var(--color-ink-muted); }

.footer-nav__list { display: grid; gap: var(--space-1); }

.footer-nav__list a,
.footer-lines__list a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.footer-nav__list a:hover,
.footer-nav__list a:focus-visible,
.footer-lines__list a:hover,
.footer-lines__list a:focus-visible {
  border-bottom-color: var(--color-contrast-accent);
}

.footer-lines__list { display: grid; gap: var(--space-1); }

.footer-lines__list a {
  display: grid;
  grid-template-columns: 3ch minmax(0, 1fr);
  align-items: baseline;
  gap: var(--space-1);
}

.footer-lines__list a::before {
  content: "\2192";
  font-family: var(--font-mono);
  color: var(--color-contrast-accent);
}

.footer-contact {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--space-4) var(--space-6);
  align-items: start;
}

.footer-contact__lead {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink);
}

.footer-contact__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3) var(--space-4);
}

.footer-contact__item dt {
  margin-bottom: 6px;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.footer-contact__item dd {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

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

.footer-legal__links a {
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.footer-legal__links a:hover,
.footer-legal__links a:focus-visible {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-accent);
}

.footer-legal__icp { font-family: var(--font-mono); }

@media (max-width: 980px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .footer-tier { padding-block: var(--space-6); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-contact__list { grid-template-columns: 1fr; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
}