:root {
  --color-surface: #f0f0f0;
  --color-surface-alt: #e7e7e7;
  --color-surface-deep: #dbdbda;
  --color-ink: #40443b;
  --color-ink-soft: #636a5d;
  --color-ink-muted: #7f8679;
  --color-line: #d0d1cf;
  --color-primary: #4b8514;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #d9e1d1;
  --color-accent: #cb15ca;
  --color-accent-ink: #ffffff;
  --color-highlight: #e9c9e9;
  --color-focus: #be09bd;
  --color-contrast-surface: #131a0d;
  --color-contrast-ink: #e5e7e4;
  --color-contrast-line: #41473c;
  --color-contrast-accent: #e718e6;
  --overlay-scrim: linear-gradient(180deg, rgba(19, 26, 13, 0.35) 0%, rgba(19, 26, 13, 0.72) 55%, rgba(19, 26, 13, 0.92) 100%);
  --font-heading: "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, 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(50px, 10.3vw, 132px);
  --text-figure: clamp(42px, 7.4vw, 95px);
  --weight-heading: 732;
  --weight-body: 400;
  --leading-body: 1.76;
  --leading-heading: 1.27;
  --tracking-heading: -0.013em;
  --radius-sm: 0px;
  --radius-md: 2px;
  --radius-lg: 4px;
  --radius-pill: 4px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(64, 68, 59, 0.12);
  --shadow-2: 0 2px 0 rgba(64, 68, 59, 0.18);
  --space-1: 7px;
  --space-2: 14px;
  --space-3: 21px;
  --space-4: 28px;
  --space-6: 42px;
  --space-8: 56px;
  --container: 1280px;
  --measure: 68ch;
  --gutter: 14px;
  --section-y: 79px;
  --section-y-lg: 111px;
}

/* ============================================================
   reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* ============================================================
   中文排版基线
   ============================================================ */
body {
  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);
  overflow-wrap: break-word;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5 {
  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); }
strong, b { font-weight: 700; }
::selection { background: var(--color-highlight); color: var(--color-ink); }
:focus-visible { outline: var(--border-thick) solid var(--color-focus); outline-offset: 2px; }

.mono, .num, .note { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.note {
  display: inline-block;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.eyebrow::before { content: ""; width: 18px; height: var(--border-thick); background: var(--color-accent); }
.lede {
  max-width: var(--measure);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink-soft);
}
.display {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.95;
  letter-spacing: var(--tracking-heading);
  text-wrap: balance;
}

/* ============================================================
   布局
   ============================================================ */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--space-3); }
.container--wide { max-width: calc(var(--container) + var(--space-8)); }

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--paper { background: var(--color-surface); }
.section--tint { background: var(--color-surface-alt); }
.section--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-block: var(--border-thin) solid var(--color-contrast-line);
}
.section--deep h1, .section--deep h2, .section--deep h3, .section--deep h4 { color: var(--color-contrast-ink); }
.section--deep .note, .section--deep .eyebrow, .section--deep .media__caption, .section--deep .stat__label {
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.section--deep .rule { background: var(--color-contrast-line); }
.section--deep .media { border-color: var(--color-contrast-line); background: color-mix(in srgb, var(--color-contrast-surface) 70%, var(--color-contrast-line)); }

.grid { display: grid; gap: var(--gutter); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); }
.grid--asym-rev { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); }
.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-12 { grid-column: span 12; }

.stack { display: flex; flex-direction: column; gap: var(--space-2); }
.stack--lg { gap: var(--space-4); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }

.rule { height: var(--border-thin); background: var(--color-line); border: 0; }
.rule--thick { height: var(--border-thick); }
.rule--accent { background: var(--color-accent); }
.rule--offset { margin-left: calc(var(--space-4) * -1); }

.prose { max-width: var(--measure); }
.prose p { margin-bottom: var(--space-3); }
.prose > :last-child { margin-bottom: 0; }
.prose h2 { margin: var(--space-6) 0 var(--space-2); }
.prose h3 { margin: var(--space-4) 0 var(--space-1); }
.prose ul, .prose ol { margin-bottom: var(--space-3); padding-left: var(--space-3); }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: var(--space-1); }
.prose a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--color-accent); }
.prose blockquote {
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-accent);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
}
.section--deep .prose a { color: var(--color-contrast-accent); }

/* ============================================================
   skip link
   ============================================================ */
.skip-link {
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 200;
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  border: var(--border-thin) solid var(--color-contrast-surface);
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

/* ============================================================
   悬浮胶囊导航
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: var(--space-2) var(--space-3);
  pointer-events: none;
}
.site-header__bar {
  position: relative;
  pointer-events: auto;
  max-width: var(--container);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background: color-mix(in srgb, var(--color-contrast-surface) 88%, transparent);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
  backdrop-filter: blur(14px) saturate(1.25);
}
.site-header__brand { display: flex; align-items: center; gap: var(--space-2); min-width: 0; }
.brand { display: inline-flex; align-items: center; gap: var(--space-2); min-width: 0; }
.brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1;
  border-radius: var(--radius-sm);
  box-shadow: 3px 3px 0 color-mix(in srgb, var(--color-accent) 85%, transparent);
}
.brand__text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.brand__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
  white-space: nowrap;
}
.header-note {
  display: none;
  align-items: center;
  gap: var(--space-1);
  margin-left: var(--space-1);
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
  white-space: nowrap;
}
.header-note__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-contrast-accent);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: 0.25; } }

.site-nav { display: flex; align-items: center; gap: var(--space-2); margin-left: auto; }
.site-nav__list { display: flex; align-items: center; gap: 2px; }
.site-nav__list a {
  display: block;
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: color-mix(in srgb, var(--color-contrast-ink) 90%, transparent);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.site-nav__list a:hover {
  background: color-mix(in srgb, var(--color-primary) 36%, transparent);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.site-nav__list a[aria-current="page"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.site-nav__actions { display: flex; align-items: center; gap: var(--space-1); }
.pill-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-pill);
  transition: background 0.18s ease;
}
.pill-link:hover { background: color-mix(in srgb, var(--color-primary) 74%, var(--color-contrast-surface)); }
.pill-link--accent { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.pill-link--accent:hover { background: color-mix(in srgb, var(--color-accent) 78%, var(--color-contrast-surface)); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
  padding: var(--space-1) var(--space-2);
  background: transparent;
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; width: 14px; }
.nav-toggle__bars span { display: block; height: 2px; background: currentColor; transition: transform 0.2s ease, opacity 0.2s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle__label { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.1em; }

@media (min-width: 1100px) { .header-note { display: inline-flex; } }

@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }
  .brand__tag { display: none; }
  .site-nav {
    position: absolute;
    top: calc(100% + var(--space-1));
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    margin-left: 0;
    padding: var(--space-2);
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    background: var(--color-contrast-surface);
    border: var(--border-thin) solid var(--color-contrast-line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open] { display: flex; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .site-nav__list a { padding: var(--space-2); border-radius: var(--radius-sm); font-size: var(--text-sm); }
  .site-nav__actions { flex-wrap: wrap; }
}
@media (max-width: 640px) {
  .site-header { padding: var(--space-2) var(--space-1); }
  .site-header__bar { padding: var(--space-1); gap: var(--space-1); }
  .brand__name { font-size: var(--text-base); }
}

/* ============================================================
   按钮 / 徽标 / 筛选
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  cursor: pointer;
  background: transparent;
  color: var(--color-primary);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn:hover { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 76%, var(--color-contrast-surface)); }
.btn--accent { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background: color-mix(in srgb, var(--color-accent) 78%, var(--color-contrast-surface)); }
.btn--ghost { border-color: var(--color-line); color: var(--color-ink-soft); }
.btn--ghost:hover { background: var(--color-primary-soft); border-color: var(--color-primary); color: var(--color-primary); }
.section--deep .btn { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.section--deep .btn:hover { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.section--deep .btn--accent { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.tag--primary { background: var(--color-primary-soft); border-color: var(--color-primary); color: color-mix(in srgb, var(--color-primary) 84%, var(--color-ink)); }
.tag--accent { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.tag--ghost { background: transparent; }

.chips { display: flex; flex-wrap: wrap; gap: var(--space-1); }
.chip {
  padding: var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  cursor: pointer;
  background: transparent;
  color: var(--color-ink-soft);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  transition: background 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"] { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.section--deep .chip { color: var(--color-contrast-ink); border-color: var(--color-contrast-line); }
.section--deep .chip[aria-pressed="true"] { background: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }

/* ============================================================
   面包屑
   ============================================================ */
.crumbs { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.05em; color: var(--color-ink-muted); }
.crumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.crumbs li { display: inline-flex; align-items: center; }
.crumbs li + li::before { content: "⁄"; margin-right: var(--space-1); color: var(--color-accent); }
.crumbs a { border-bottom: var(--border-thin) solid var(--color-line); }
.crumbs a:hover { color: var(--color-ink); border-bottom-color: var(--color-accent); }
.section--deep .crumbs { color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent); }
.section--deep .crumbs a { border-bottom-color: var(--color-contrast-line); }

/* ============================================================
   图片容器 / 剪贴咬合
   ============================================================ */
.media {
  position: relative;
  overflow: hidden;
  background: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 16 / 7; }
.media--panorama { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media--strip { aspect-ratio: 3 / 1; }
.media__scrim { position: absolute; inset: 0; background: var(--overlay-scrim); pointer-events: none; }
.media__label {
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
}
.media__stamp { position: absolute; top: var(--space-2); right: var(--space-2); }
.media__caption {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.bite {
  position: relative;
  z-index: 3;
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-2);
}
.bite--accent { background: var(--color-accent); color: var(--color-accent-ink); border-color: var(--color-accent); }
.bite--accent .note { color: color-mix(in srgb, var(--color-accent-ink) 82%, transparent); }
.bite--deep { background: var(--color-contrast-surface); color: var(--color-contrast-ink); border-color: var(--color-contrast-line); }
.bite--deep .note { color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent); }
@media (min-width: 768px) {
  .bite--left { margin-left: calc(var(--space-6) * -1); }
  .bite--right { margin-right: calc(var(--space-6) * -1); }
  .bite--up { margin-top: calc(var(--space-6) * -1); }
}

/* ============================================================
   数据 / 面板 / 表格 / 展开组
   ============================================================ */
.stat { display: flex; flex-direction: column; gap: var(--space-1); }
.stat__num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  font-variant-numeric: tabular-nums;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}
.stat--primary .stat__num { color: var(--color-primary); }
.section--deep .stat__num { color: var(--color-contrast-accent); }
.stat__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.panel {
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}
.panel--tint { background: var(--color-surface-alt); }
.panel--deep { background: var(--color-contrast-surface); border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.panel--deep h3, .panel--deep h4 { color: var(--color-contrast-ink); }
.panel--primary-rule { border-top: var(--border-thick) solid var(--color-primary); }
.panel--accent-rule { border-top: var(--border-thick) solid var(--color-accent); }
.panel__title { margin-bottom: var(--space-1); font-family: var(--font-heading); font-size: var(--text-lg); }

.table-wrap { width: 100%; overflow-x: auto; }
.table { width: 100%; font-size: var(--text-sm); }
.table th, .table td { padding: var(--space-1) var(--space-2); text-align: left; border-bottom: var(--border-thin) solid var(--color-line); }
.table thead th {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  border-bottom: var(--border-thick) solid var(--color-ink-soft);
}
.table tbody tr:nth-child(even) { background: var(--color-primary-soft); }
.table td.is-num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; }
.section--deep .table th, .section--deep .table td { color: var(--color-contrast-ink); border-color: var(--color-contrast-line); }
.section--deep .table tbody tr:nth-child(even) { background: color-mix(in srgb, var(--color-contrast-ink) 6%, transparent); }

.collapse { border-top: var(--border-thin) solid var(--color-line); }
.collapse:last-of-type { border-bottom: var(--border-thin) solid var(--color-line); }
.collapse__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  text-align: left;
  cursor: pointer;
  background: transparent;
  border: 0;
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-ink);
  transition: color 0.18s ease;
}
.collapse__trigger:hover { color: var(--color-primary); }
.collapse__trigger::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-accent);
}
.collapse__trigger[aria-expanded="true"]::after { content: "－"; }
.collapse__panel { padding-bottom: var(--space-3); animation: panel-in 0.22s ease both; }
.collapse__panel[hidden] { display: none; }
@keyframes panel-in { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
.section--deep .collapse, .section--deep .collapse:last-of-type { border-color: var(--color-contrast-line); }
.section--deep .collapse__trigger { color: var(--color-contrast-ink); }

/* ============================================================
   页脚：同色延续
   ============================================================ */
.site-footer {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) solid var(--color-primary);
  padding-block: var(--space-8) var(--space-4);
}
.site-footer__inner { max-width: var(--container); margin-inline: auto; padding-inline: var(--space-3); }
.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 0.85fr)) minmax(0, 1.2fr);
  gap: var(--space-6) var(--space-4);
}
.footer-brand { position: relative; padding-top: var(--space-3); }
.footer-stamp {
  position: absolute;
  top: calc(var(--space-8) * -1 - var(--space-2));
  left: 0;
  z-index: 2;
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  transform: rotate(-2.5deg);
  box-shadow: var(--shadow-2);
}
.footer-stamp__num { font-size: var(--text-lg); font-weight: 700; font-variant-numeric: tabular-nums; }
.footer-stamp__label { font-size: var(--text-xs); letter-spacing: 0.12em; opacity: 0.85; }
.footer-brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.footer-brand__tag {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer-slogan {
  margin-top: var(--space-3);
  max-width: 26ch;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: 1.35;
  color: var(--color-contrast-ink);
}
.footer-col { min-width: 0; }
.footer-col__title {
  padding-bottom: var(--space-1);
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-links { display: flex; flex-direction: column; gap: var(--space-1); }
.footer-links a {
  display: inline-block;
  padding: 2px 0;
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-links a:hover { color: var(--color-contrast-accent); border-bottom-color: var(--color-contrast-accent); }
.footer-contact__list { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-contact__item { display: flex; flex-direction: column; gap: 2px; }
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 56%, transparent);
}
.footer-contact__value {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-ink);
  overflow-wrap: anywhere;
}
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-6);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer-meta__note { max-width: 52ch; }
.footer-icp, .footer-copy { font-variant-numeric: tabular-nums; }
.footer-icp { margin-left: auto; }

@media (max-width: 1200px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 768px) {
  .footer-stamp {
    position: static;
    transform: none;
    display: inline-flex;
    margin-bottom: var(--space-2);
  }
  .footer-brand { padding-top: 0; }
}
@media (max-width: 640px) {
  .site-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer-brand { grid-column: auto; }
  .footer-icp { margin-left: 0; }
}

/* ============================================================
   滚动进度与显现
   ============================================================ */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  height: var(--border-thick);
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-contrast-accent));
  pointer-events: none;
}
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translate3d(-10px, 10px, 0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.js-reveal [data-reveal].is-visible { opacity: 1; transform: none; }

/* ============================================================
   响应式栅格
   ============================================================ */
@media (max-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--asym, .grid--asym-rev { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 768px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 6; }
  .rule--offset { margin-left: 0; }
  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }
}

/* ============================================================
   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; }
  .js-reveal [data-reveal] { opacity: 1; transform: none; }
  .header-note__dot { animation: none; }
}