:root {
  --color-surface: #f0efef;
  --color-surface-alt: #e8e6e6;
  --color-surface-deep: #dcdada;
  --color-ink: #48403c;
  --color-ink-soft: #716660;
  --color-ink-muted: #897c76;
  --color-line: #d2d0cf;
  --color-primary: #b36037;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e7dbd5;
  --color-accent: #946f1e;
  --color-accent-ink: #ffffff;
  --color-highlight: #dfd8c9;
  --color-focus: #8b6513;
  --color-contrast-surface: #2c201b;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #554b47;
  --color-contrast-accent: #d49f2b;
  --overlay-scrim: linear-gradient(180deg, rgba(44, 32, 27, 0.35) 0%, rgba(44, 32, 27, 0.72) 55%, rgba(44, 32, 27, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(38px, 7.7vw, 99px);
  --text-figure: clamp(31px, 5.5vw, 71px);
  --weight-heading: 658;
  --weight-body: 400;
  --leading-body: 1.84;
  --leading-heading: 1.26;
  --tracking-heading: -0.004em;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 17px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(72, 64, 60, 0.08);
  --shadow-2: 0 18px 44px rgba(72, 64, 60, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1040px;
  --measure: 73ch;
  --gutter: 24px;
  --section-y: 86px;
  --section-y-lg: 120px;
}

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

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

body {
  margin: 0;
  background-color: 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);
  letter-spacing: 0.01em;
  background-image:
    radial-gradient(1100px 480px at 8% -8%, color-mix(in srgb, var(--color-primary-soft) 74%, transparent), transparent 68%),
    radial-gradient(820px 380px at 98% 0%, color-mix(in srgb, var(--color-highlight) 62%, transparent), transparent 66%);
  background-repeat: no-repeat;
}

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 { margin: 0 0 var(--space-2); max-width: var(--measure); }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; }
table { width: 100%; border-collapse: collapse; }
[hidden] { display: none !important; }

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

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

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--color-accent); }

/* ---------- 布局容器与栅格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

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

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: 1 / -1; }
.start-2 { grid-column-start: 2; }
.start-7 { grid-column-start: 7; }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: var(--space-8); }
.section--warm {
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-lg);
  padding-inline: var(--space-3);
}
.section--contrast {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
  padding-inline: var(--space-3);
  background-image:
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--color-contrast-line) 46%, transparent) 0 1px, transparent 1px 56px),
    radial-gradient(620px 300px at 88% 0%, color-mix(in srgb, var(--color-contrast-accent) 20%, transparent), transparent 70%);
}
.section--contrast h2,
.section--contrast h3 { color: var(--color-contrast-ink); }
.section--contrast p { color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
}
.section-head h2 { font-size: var(--text-2xl); }

.eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
}
.section--contrast .eyebrow { color: var(--color-contrast-accent); }

.lead {
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.rule-double {
  display: block;
  margin-block: var(--space-6);
  border-top: calc(var(--border-thick) * 3) solid var(--color-ink);
}
.rule-double::after {
  content: "";
  display: block;
  margin-top: 4px;
  border-top: var(--border-thin) solid var(--color-line);
}
.section--contrast .rule-double { border-top-color: var(--color-contrast-accent); }
.section--contrast .rule-double::after { border-top-color: var(--color-contrast-line); }

/* ---------- 正文 ---------- */
.prose { max-width: var(--measure); }
.prose h2 { font-size: var(--text-2xl); margin: var(--space-6) 0 var(--space-2); }
.prose h3 { font-size: var(--text-xl); margin: var(--space-4) 0 var(--space-1); }
.prose ul, .prose ol { margin-bottom: var(--space-3); }
.prose li { position: relative; padding-left: var(--space-3); margin-bottom: 6px; }
.prose li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* ---------- 页头 ---------- */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -120px;
  z-index: 100;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: top 0.2s ease;
}
.skip-link:focus { top: var(--space-2); }

.site-header { position: relative; z-index: 30; background-color: var(--color-surface); }

.header-strip {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  background-image: radial-gradient(560px 150px at 86% 0%, color-mix(in srgb, var(--color-contrast-accent) 26%, transparent), transparent 72%);
}
.strip-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-6);
  padding-block: 10px;
}
.strip-item {
  margin: 0;
  max-width: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.07em;
}
.strip-item--brand { font-family: var(--font-mono); color: var(--color-contrast-accent); }
.strip-item--hint { margin-left: auto; color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent); }
.strip-dot {
  flex: none;
  width: 7px; height: 7px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-contrast-accent) 24%, transparent);
}

.masthead { border-bottom: calc(var(--border-thick) * 3) solid var(--color-ink); }
.masthead-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: end;
  gap: var(--space-3);
  padding-block: var(--space-4) var(--space-3);
}
.masthead-meta {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 250px;
}
.meta-strong { font-size: var(--text-sm); color: var(--color-ink-soft); }
.meta-quiet { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-muted); letter-spacing: 0.04em; }

.brand { display: inline-flex; align-items: center; gap: var(--space-2); justify-self: center; }
.brand-mark {
  flex: none;
  width: 46px; height: 46px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  box-shadow: var(--shadow-1);
}
.brand-text { display: flex; flex-direction: column; gap: 2px; }
.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
}
.brand-sub { font-size: var(--text-xs); color: var(--color-ink-muted); letter-spacing: 0.14em; }

.masthead-side { display: flex; align-items: center; gap: var(--space-2); justify-self: end; }
.masthead-stat {
  margin: 0;
  max-width: none;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  text-align: right;
  letter-spacing: 0.04em;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.nav-toggle:hover { border-color: var(--color-accent); color: var(--color-accent); }
.nav-toggle-bars { position: relative; width: 16px; height: 10px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  border-radius: 2px;
  background-color: var(--color-primary);
  transition: transform 0.25s ease;
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-4px) rotate(-45deg); }
.nav-toggle-label { font-size: var(--text-xs); letter-spacing: 0.16em; }

.site-nav {
  background-color: color-mix(in srgb, var(--color-surface) 84%, var(--color-primary-soft));
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.nav-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-2);
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2) var(--space-6);
  counter-reset: nav-index;
}
.nav-list li { counter-increment: nav-index; }
.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: 6px 2px;
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  transition: color 0.2s ease;
}
.nav-list a::before {
  content: counter(nav-index, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  transition: color 0.2s ease;
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  border-radius: 2px;
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-contrast-accent));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s ease;
}
.nav-list a:hover { color: var(--color-ink); }
.nav-list a:hover::after,
.nav-list a:focus-visible::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] { color: var(--color-ink); }
.nav-list a[aria-current="page"]::before { color: var(--color-accent); }
.nav-list a[aria-current="page"]::after {
  transform: scaleX(1);
  background-image: linear-gradient(90deg, var(--color-accent), var(--color-contrast-accent));
}
.nav-hint {
  margin: 0;
  max-width: none;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  z-index: 80;
  pointer-events: none;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 12%, transparent);
}
.scroll-progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background-image: linear-gradient(90deg, var(--color-primary), var(--color-accent) 46%, var(--color-contrast-accent));
  transition: transform 0.12s linear;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--section-y-lg);
  padding-block: var(--space-8) var(--space-4);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: calc(var(--border-thick) * 3) solid var(--color-ink);
  background-image:
    radial-gradient(640px 280px at 6% 0%, color-mix(in srgb, var(--color-contrast-accent) 18%, transparent), transparent 72%),
    radial-gradient(560px 320px at 94% 100%, color-mix(in srgb, var(--color-primary) 24%, transparent), transparent 74%);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, color-mix(in srgb, var(--color-contrast-line) 42%, transparent) 0 1px, transparent 1px 64px);
  opacity: 0.5;
}
.site-footer > .wrap { position: relative; }

.footer-masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-brand {
  margin: 0;
  max-width: none;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}
.footer-brand span { color: var(--color-contrast-accent); }
.footer-closing {
  margin: 0;
  max-width: 42ch;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3);
  padding-block: var(--space-6);
}
.footer-col--nav { grid-column: span 3; }
.footer-col--more { grid-column: span 3; }
.footer-col--note { grid-column: span 3; }
.footer-col--legal { grid-column: span 3; }

.footer-col {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  background-color: color-mix(in srgb, var(--color-contrast-ink) 5%, transparent);
}
.footer-title {
  position: relative;
  margin: 0 0 var(--space-2);
  padding-left: var(--space-2);
  font-size: var(--text-lg);
  color: var(--color-contrast-ink);
}
.footer-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 8px;
  height: 3px;
  border-radius: 2px;
  background-color: var(--color-contrast-accent);
}
.footer-links li + li { margin-top: 2px; }
.footer-links a {
  display: inline-block;
  padding: 5px 0;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-contrast-accent);
  border-bottom-color: color-mix(in srgb, var(--color-contrast-accent) 60%, transparent);
  transform: translateX(2px);
}
.footer-note p {
  margin: 0 0 var(--space-1);
  max-width: none;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}
.footer-note p:last-child { margin-bottom: 0; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-1) var(--space-3);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.footer-legal p {
  margin: 0;
  max-width: none;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* ---------- 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 12px 24px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.btn-ghost {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }

.breadcrumb {
  padding-block: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.breadcrumb li { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumb li + li::before { content: "/"; color: var(--color-line); }
.breadcrumb a { color: var(--color-ink-soft); border-bottom: var(--border-thin) solid var(--color-line); }
.breadcrumb a:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3);
}
.card {
  position: relative;
  overflow: hidden;
  grid-column: span 4;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background-image: radial-gradient(320px 180px at 88% -12%, color-mix(in srgb, var(--color-contrast-accent) 34%, transparent), transparent 66%);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.card:hover,
.card:focus-within { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.card:hover::after,
.card:focus-within::after { opacity: 1; }
.card--wide { grid-column: span 7; }
.card--narrow { grid-column: span 5; }
.card--full { grid-column: 1 / -1; }
.card-title { margin: 0 0 var(--space-1); font-size: var(--text-xl); }
.card-meta {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 42%, transparent);
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-highlight) 62%, transparent);
  color: var(--color-accent);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}
.tag--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: transparent;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-2);
}
.filter-chip {
  padding: 7px 15px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.filter-chip:hover { border-color: var(--color-accent); color: var(--color-accent); }
.filter-chip.is-active,
.filter-chip[aria-pressed="true"] {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: transparent;
}
.filter-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.panel {
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}
.panel + .panel { margin-top: var(--space-2); }
.panel summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  cursor: pointer;
  list-style: none;
}
.panel summary::-webkit-details-marker { display: none; }
.panel summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-accent);
}
.panel[open] summary::after { content: "－"; }
.panel[open] { box-shadow: var(--shadow-1); }
.panel-body {
  padding: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  background-color: color-mix(in srgb, var(--color-surface-alt) 70%, var(--color-surface));
}
.panel-body p:last-child { margin-bottom: 0; }

.toc {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-alt);
}
.toc h2 { margin-bottom: var(--space-2); font-size: var(--text-lg); }
.toc a {
  display: flex;
  gap: var(--space-1);
  padding: 7px 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-line) 70%, transparent);
}
.toc a::before {
  content: counter(toc-index, decimal-leading-zero);
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
}
.toc ol { counter-reset: toc-index; }
.toc li { counter-increment: toc-index; }
.toc a[aria-current="true"] { color: var(--color-primary); }
.toc a[aria-current="true"]::before { color: var(--color-primary); }

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.copy-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.copy-btn[data-copied="true"] {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: transparent;
}

.quote {
  position: relative;
  margin: var(--space-6) 0;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border-left: calc(var(--border-thick) * 4) solid var(--color-primary);
  background-color: var(--color-highlight);
}
.quote::before {
  content: "“";
  position: absolute;
  left: var(--space-2);
  top: 4px;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  line-height: 1;
  color: color-mix(in srgb, var(--color-primary) 52%, transparent);
}
.quote p { max-width: var(--measure); }
.quote p:last-child { margin-bottom: 0; }

.figure { margin: 0 0 var(--space-3); }
.media {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}
.media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.media:hover img { transform: scale(1.02); }
.media--wide img { aspect-ratio: 21 / 9; }
.media--tall img { aspect-ratio: 3 / 4; }
.media--square img { aspect-ratio: 1 / 1; }
.media-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--space-1);
  padding: var(--space-3);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  border-radius: inherit;
}
.media-overlay p { margin: 0; max-width: 40ch; color: var(--color-contrast-ink); }
.media-caption {
  margin: var(--space-1) 0 0;
  max-width: var(--measure);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.stat-figure {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  line-height: 1;
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}
.stat-figure--gold { color: var(--color-contrast-accent); }

/* ---------- 滚动显现 ---------- */
[data-reveal] { transition: opacity 0.6s ease, transform 0.6s ease; }
html[data-js="on"] [data-reveal]:not(.is-visible) {
  opacity: 0;
  transform: translateY(14px);
}

/* ---------- 断点 ---------- */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col--nav,
  .footer-col--more,
  .footer-col--note,
  .footer-col--legal { grid-column: auto; }
  .card--wide,
  .card--narrow { grid-column: span 6; }
  .card { grid-column: span 6; }
  .col-3, .col-4, .col-5 { grid-column: span 6; }
  .col-7, .col-8 { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .masthead-inner {
    grid-template-columns: 1fr auto;
    align-items: center;
    padding-block: var(--space-3);
  }
  .brand { grid-column: 1; justify-self: start; }
  .masthead-side { grid-column: 2; justify-self: end; }
  .masthead-meta,
  .masthead-stat { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.34s ease;
  }
  .nav-inner {
    overflow: hidden;
    min-height: 0;
    visibility: hidden;
    padding-block: 0;
    align-items: stretch;
  }
  .site-nav[data-open="true"] { grid-template-rows: 1fr; }
  .site-nav[data-open="true"] .nav-inner {
    visibility: visible;
    padding-block: var(--space-2) var(--space-3);
  }
  .nav-list { flex-direction: column; gap: 0; width: 100%; }
  .nav-list li { border-bottom: var(--border-thin) solid var(--color-line); }
  .nav-list a {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 2px;
    font-size: var(--text-base);
  }
  .nav-list a::after { bottom: -1px; }
  .nav-hint { padding-top: var(--space-2); text-align: left; }

  .strip-item--hint { margin-left: 0; }
  .section { padding-block: var(--space-6); }
  .section--warm,
  .section--contrast { padding-inline: var(--space-2); }

  .grid { grid-template-columns: 1fr; }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-12 { grid-column: 1 / -1; }
  .start-2, .start-7 { grid-column-start: auto; }
  .card-grid { grid-template-columns: 1fr; }
  .card, .card--wide, .card--narrow, .card--full { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .wrap { padding-inline: var(--space-2); }
  .footer-grid { grid-template-columns: 1fr; }
  .section-head h2,
  .prose h2 { font-size: var(--text-xl); }
  .lead { font-size: var(--text-base); }
  .footer-masthead { flex-direction: column; align-items: flex-start; }
  .footer-legal { flex-direction: column; }
}

/* ---------- 动效与可访问性 ---------- */
@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;
  }
  html[data-js="on"] [data-reveal]:not(.is-visible) { opacity: 1; transform: none; }
  .scroll-progress span { transition: none; }
  .media:hover img { transform: none; }
}