:root {
  --color-surface: #fcfcfc;
  --color-surface-alt: #f2f2f2;
  --color-surface-deep: #e4e4e5;
  --color-ink: #34333d;
  --color-ink-soft: #605e6e;
  --color-ink-muted: #797788;
  --color-line: #d8d8da;
  --color-primary: #2711ee;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dedbfa;
  --color-accent: #757b05;
  --color-accent-ink: #ffffff;
  --color-highlight: #e4e5d0;
  --color-focus: #6f7500;
  --color-contrast-surface: #0f0d1e;
  --color-contrast-ink: #e4e4e7;
  --color-contrast-line: #3e3c4a;
  --color-contrast-accent: #eaf50a;
  --overlay-scrim: linear-gradient(180deg, rgba(15, 13, 30, 0.35) 0%, rgba(15, 13, 30, 0.72) 55%, rgba(15, 13, 30, 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: 7.8px;
  --text-sm: 12.6px;
  --text-base: 16px;
  --text-lg: 25.9px;
  --text-xl: 41.9px;
  --text-2xl: 67.8px;
  --text-3xl: 109.7px;
  --text-4xl: 177.4px;
  --text-display: clamp(62px, 12.8vw, 164px);
  --text-figure: clamp(52px, 9.2vw, 118px);
  --weight-heading: 816;
  --weight-body: 400;
  --leading-body: 1.78;
  --leading-heading: 1.25;
  --tracking-heading: -0.011em;
  --radius-sm: 2px;
  --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: 71ch;
  --gutter: 32px;
  --section-y: 92px;
  --section-y-lg: 129px;
}

/* ============ reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, figure, dl, dd, ul, ol, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; border-spacing: 0; }
summary { cursor: pointer; }
hr { border: 0; border-top: var(--border-thin) solid var(--color-line); margin: 0; }
::selection { background: var(--color-primary); color: var(--color-primary-ink); }

/* ============ base type ============ */
body {
  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);
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  text-wrap: balance;
}
p { text-wrap: pretty; }
strong, b { font-weight: var(--weight-heading); }
code, kbd, samp, .mono { font-family: var(--font-mono); }

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

/* ============ layout ============ */
.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-4);
}
@media (max-width: 640px) {
  .wrap { padding-inline: var(--space-3); }
}

.grid {
  display: grid;
  grid-template-columns: repeat(11, 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-11 { grid-column: span 11; }

@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: var(--space-4); }
  .grid > * { grid-column: 1 / -1; }
}

.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 .kicker { color: var(--color-contrast-accent); }
.section--deep .prose a { color: var(--color-contrast-accent); }
.section--deep .badge--outline { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }

.section-head {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  gap: var(--space-4);
  align-items: end;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thick) solid var(--color-line);
}
.section--deep .section-head { border-bottom-color: var(--color-contrast-line); }
.section-head__index {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.18em;
  color: var(--color-accent);
  padding-bottom: 6px;
}
.section-head__title { font-size: var(--text-xl); line-height: 1.1; }
@media (max-width: 640px) {
  .section-head { grid-template-columns: minmax(0, 1fr); gap: var(--space-1); }
  .section-head__title { font-size: var(--text-lg); }
}

.kicker {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* ============ 展示级排版 ============ */
.display-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.84;
  letter-spacing: -0.035em;
  text-transform: uppercase;
}
.display-title__line { display: block; }
.display-title__line--outline {
  color: transparent;
  -webkit-text-stroke: var(--border-thick) var(--color-primary);
}
.section--deep .display-title__line--outline { -webkit-text-stroke-color: var(--color-contrast-accent); }

.figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.9;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.lede {
  font-size: var(--text-lg);
  line-height: 1.5;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}
.section--deep .lede { color: var(--color-contrast-ink); }

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { font-size: var(--text-xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-4); }
.prose ul { display: grid; gap: var(--space-1); }
.prose li { position: relative; padding-left: 1.15em; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 7px;
  height: var(--border-thick);
  background-color: var(--color-accent);
}
.prose a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============ 色块与斜切 ============ */
.slab {
  position: relative;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  padding: var(--space-8) var(--space-6) calc(var(--space-8) + 42px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 48px), 0 100%);
}
.slab--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.slab--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  clip-path: polygon(0 48px, 100% 0, 100% 100%, 0 100%);
  padding-top: calc(var(--space-8) + 42px);
}
.slab h1, .slab h2, .slab h3 { color: inherit; }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 13px 22px;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  border: var(--border-thick) solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.btn--primary { background-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface)); }
.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--ghost { border-color: var(--color-line); color: var(--color-ink); }
.btn--ghost:hover {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

/* ============ 徽标与标签 ============ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-size: var(--text-sm);
  line-height: 1.5;
  letter-spacing: 0.1em;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}
.badge--accent { background-color: var(--color-accent); color: var(--color-accent-ink); }
.badge--outline {
  background-color: transparent;
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
}
.badge--dark { background-color: var(--color-contrast-surface); color: var(--color-contrast-accent); }

/* ============ 面包屑 ============ */
.crumbs {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  padding-block: var(--space-3);
}
.crumbs__list { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.crumbs__list li { display: inline-flex; align-items: center; gap: 6px; }
.crumbs__list li + li::before { content: "/"; color: var(--color-line); }
.crumbs a:hover { color: var(--color-primary); }

/* ============ 数据组件 ============ */
.datacard {
  background-color: var(--color-primary-soft);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}
.datacard--accent {
  background-color: var(--color-highlight);
  border-left-color: var(--color-accent);
}
.datacard--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-left-color: var(--color-contrast-accent);
}
.datacard__label {
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
}
.datacard--deep .datacard__label { color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent); }
.datacard__value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  border-top: var(--border-thin) solid var(--color-line);
}
.section--deep .stat-row { border-top-color: var(--color-contrast-line); }
.stat {
  padding: var(--space-3) var(--space-3) var(--space-3) 0;
  border-right: var(--border-thin) solid var(--color-line);
}
.stat:last-child { border-right: 0; }
.section--deep .stat { border-right-color: var(--color-contrast-line); }
.stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.stat__label { font-size: var(--text-sm); color: var(--color-ink-soft); }
.section--deep .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent); }

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

details.fold {
  border-top: var(--border-thin) solid var(--color-line);
}
details.fold:last-of-type { border-bottom: var(--border-thin) solid var(--color-line); }
details.fold > summary {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  list-style: none;
}
details.fold > summary::-webkit-details-marker { display: none; }
details.fold > summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--color-accent);
  flex: none;
}
details.fold[open] > summary::after { content: "–"; }
details.fold > .fold__body { padding-bottom: var(--space-4); }

.table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}
.data-table {
  width: 100%;
  min-width: 560px;
  font-size: var(--text-sm);
}
.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.data-table thead th {
  background-color: var(--color-surface-deep);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
}
.data-table tbody tr:nth-child(even) { background-color: var(--color-surface-alt); }
.data-table tbody tr:hover { background-color: var(--color-highlight); }
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table .num {
  font-family: var(--font-mono);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.timeline { border-left: var(--border-thick) solid var(--color-line); }
.timeline__item { position: relative; padding: 0 0 var(--space-4) var(--space-4); }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 7px;
  width: 10px;
  height: 10px;
  background-color: var(--color-primary);
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__date {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

/* ============ 图片容器 ============ */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-deep);
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--ph {
  background-image: repeating-linear-gradient(
    135deg,
    var(--color-surface-deep) 0 12px,
    var(--color-surface-alt) 12px 24px
  );
}
.media-frame__img,
.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.62) contrast(1.04);
}
.media-frame__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media-frame__body {
  position: absolute;
  inset: auto var(--space-3) var(--space-3) var(--space-3);
  color: var(--color-contrast-ink);
}
.media-frame__tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 9px;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-radius: var(--radius-sm);
}
.media-frame__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.2;
}

/* ============ 筛选 ============ */
.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-1); }
.filter-btn {
  padding: 7px 14px;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.filter-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-btn[aria-pressed="true"] {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.is-hidden { display: none !important; }

/* ============ 显现 ============ */
body[data-reveal="on"] .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
body[data-reveal="on"] .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ============ 头部 ============ */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -120px;
  z-index: 200;
  padding: 10px 18px;
  font-size: var(--text-sm);
  font-weight: 700;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
}
.skip-link:focus { top: var(--space-2); }

.site-header {
  position: relative;
  z-index: 60;
  background-color: var(--color-surface);
}

.progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 140;
  pointer-events: none;
}
.progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.masthead { background-color: var(--color-surface); }
.masthead__inner {
  display: grid;
  grid-template-columns: minmax(200px, 280px) minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-6);
  padding-block: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.masthead__brand { display: flex; align-items: center; gap: var(--space-2); }
.masthead__mark {
  flex: none;
  width: 34px;
  height: 34px;
  background-color: var(--color-primary);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}
.masthead__names { display: grid; gap: 2px; }
.masthead__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.masthead__line {
  font-size: var(--text-sm);
  letter-spacing: 0.3em;
  color: var(--color-ink-soft);
}
.masthead__desc {
  font-size: var(--text-sm);
  line-height: 1.68;
  color: var(--color-ink-soft);
  max-width: 52ch;
}
.masthead__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  justify-content: flex-end;
  align-items: center;
}
.masthead__chip {
  padding: 5px 10px;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  background-color: var(--color-highlight);
  color: var(--color-ink);
  border-radius: var(--radius-sm);
}
.masthead__stamp {
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-accent);
  border: var(--border-thin) solid var(--color-accent);
  border-radius: var(--radius-sm);
}

.navbar {
  position: relative;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.navbar__inner {
  display: flex;
  align-items: stretch;
  gap: var(--space-3);
  min-height: 58px;
}
.nav { flex: 1 1 auto; min-width: 0; }
.nav__list { display: flex; flex-wrap: wrap; height: 100%; }
.nav__item { display: flex; }
.nav__link {
  display: inline-flex;
  align-items: center;
  padding: 16px var(--space-3);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
  border-bottom: 3px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.nav__link:hover { background-color: color-mix(in srgb, var(--color-primary) 42%, transparent); }
.nav__link:focus-visible { outline: var(--border-thick) solid var(--color-contrast-accent); outline-offset: -3px; }
.nav__link[aria-current="page"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-bottom-color: var(--color-contrast-accent);
}

.navbar__cta {
  display: inline-flex;
  align-items: center;
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  transition: background-color 0.18s ease;
}
.navbar__cta:hover { background-color: color-mix(in srgb, var(--color-contrast-accent) 78%, var(--color-contrast-ink)); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-contrast-ink);
  border-left: var(--border-thin) solid var(--color-contrast-line);
}
.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: var(--border-thick);
  background-color: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: var(--border-thick);
  background-color: currentColor;
  transition: transform 0.2s ease, top 0.2s ease;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.site-header[data-open="true"] .nav-toggle__bars { background-color: transparent; }
.site-header[data-open="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

@media (max-width: 1080px) {
  .masthead__inner {
    grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
    gap: var(--space-4);
  }
  .masthead__meta { grid-column: 1 / -1; justify-content: flex-start; }
}

@media (max-width: 900px) {
  .masthead__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-2);
    padding-block: var(--space-2);
  }
  .navbar__inner { justify-content: space-between; gap: var(--space-2); }
  .nav-toggle { display: inline-flex; align-self: stretch; }
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 80;
    max-height: 0;
    visibility: hidden;
    overflow: hidden;
    background-color: var(--color-contrast-surface);
    border-top: var(--border-thin) solid var(--color-contrast-line);
    transition: max-height 0.28s ease, visibility 0.28s ease;
  }
  .site-header[data-open="true"] .nav {
    max-height: 78vh;
    visibility: visible;
    overflow-y: auto;
  }
  .nav__list { flex-direction: column; }
  .nav__item { display: block; }
  .nav__link {
    width: 100%;
    justify-content: space-between;
    padding: 15px var(--space-4);
    border-bottom: var(--border-thin) solid var(--color-contrast-line);
    border-left: 3px solid transparent;
  }
  .nav__link[aria-current="page"] {
    border-bottom-color: var(--color-contrast-line);
    border-left-color: var(--color-contrast-accent);
  }
}

/* ============ 页脚 ============ */
.site-footer {
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
  border-top: var(--border-thick) solid var(--color-primary);
}
.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.75fr);
  gap: var(--space-8);
  padding-block: var(--section-y) var(--space-8);
}
.footer__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1;
  letter-spacing: -0.025em;
}
.footer__line {
  font-size: var(--text-sm);
  letter-spacing: 0.3em;
  color: var(--color-accent);
  margin-top: var(--space-1);
}
.footer__desc {
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.72;
  color: var(--color-ink-soft);
  max-width: 40ch;
}
.footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-3);
}
.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}
.footer__heading {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.footer__list { display: grid; gap: 10px; }
.footer__link {
  font-size: var(--text-sm);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.footer__link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.footer__contact { display: grid; gap: 10px; }
.footer__contact-row {
  display: grid;
  grid-template-columns: 3.6em minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
}
.footer__contact-key {
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}
.footer__contact-val {
  font-size: var(--text-sm);
  color: var(--color-ink);
  overflow-wrap: anywhere;
}
.copy-btn {
  margin-top: var(--space-3);
  padding: 7px 14px;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.copy-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.copy-btn[data-copied="true"] {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.footer__note {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
  max-width: 34ch;
}
.footer__extend {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.footer__extend-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-3);
  font-size: var(--text-sm);
}
.footer__icp {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}
.footer__copyright { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
.footer__note--deep {
  margin-top: 0;
  max-width: none;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

@media (max-width: 1000px) {
  .footer__top { grid-template-columns: minmax(0, 1fr); gap: var(--space-6); }
}
@media (max-width: 720px) {
  .footer__cols { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .footer__top { padding-block: var(--space-8) var(--space-6); }
}

/* ============ 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;
  }
  body[data-reveal="on"] .reveal { opacity: 1; transform: none; }
}