:root {
  --color-surface: #232124;
  --color-surface-alt: #312f33;
  --color-surface-deep: #434045;
  --color-ink: #c3bbc8;
  --color-ink-soft: #958a9e;
  --color-ink-muted: #81758a;
  --color-line: #403d42;
  --color-primary: #9058bb;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #322939;
  --color-accent: #35ca49;
  --color-accent-ink: #151118;
  --color-highlight: #263f2b;
  --color-focus: #28d740;
  --color-contrast-surface: #eeedef;
  --color-contrast-ink: #333036;
  --color-contrast-line: #c5c3c6;
  --color-contrast-accent: #20792c;
  --overlay-scrim: linear-gradient(180deg, rgba(238, 237, 239, 0.35) 0%, rgba(238, 237, 239, 0.72) 55%, rgba(238, 237, 239, 0.92) 100%);
  --font-heading: STZhongsong, "Source Han Serif SC", "Songti SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(50px, 10.2vw, 131px);
  --text-figure: clamp(41px, 7.3vw, 94px);
  --weight-heading: 686;
  --weight-body: 400;
  --leading-body: 1.75;
  --leading-heading: 1.22;
  --tracking-heading: 0.015em;
  --radius-sm: 6px;
  --radius-md: 7px;
  --radius-lg: 8px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(195, 187, 200, 0.08);
  --shadow-2: 0 18px 44px rgba(195, 187, 200, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1100px;
  --measure: 69ch;
  --gutter: 16px;
  --section-y: 88px;
  --section-y-lg: 123px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body {
  margin: 0;
  background-color: var(--color-surface);
  background-image:
    radial-gradient(1180px 520px at 78% -10%, color-mix(in srgb, var(--color-primary) 15%, transparent), transparent 70%),
    radial-gradient(900px 480px at 4% 10%, color-mix(in srgb, var(--color-accent) 5%, transparent), transparent 72%);
  background-repeat: no-repeat;
  background-attachment: scroll;
  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: 0.012em;
}

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

[hidden] { display: none !important; }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0ms !important;
  }
}

/* ============ 基础排版 ============ */
h1, h2, h3, h4, h5 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 74%, #ffffff);
  text-wrap: balance;
}
h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); }
h5 { font-size: var(--text-sm); letter-spacing: 0.08em; }

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

ul, ol { margin: 0 0 var(--space-3); padding-left: 1.25em; }
li { margin-bottom: 6px; }

a {
  color: color-mix(in srgb, var(--color-primary) 58%, #ffffff);
  text-decoration: none;
  transition: color 160ms ease-out;
}
a:hover {
  color: color-mix(in srgb, var(--color-primary) 34%, #ffffff);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-primary);
}

strong { color: color-mix(in srgb, var(--color-ink) 82%, #ffffff); font-weight: 600; }
small { font-size: var(--text-sm); }
time, .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.1em;
}

/* ============ 工具类 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

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

.stack > * + * { margin-top: var(--space-3); }

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

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

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: 0.008em;
  margin: 0 0 var(--space-3);
  color: color-mix(in srgb, var(--color-ink) 58%, #ffffff);
}

.lede {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-ink) 84%, #ffffff);
  max-width: 46ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-ink-soft);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--color-primary);
  flex: none;
}

.metric {
  border-left: 2px solid var(--color-primary);
  padding-left: var(--space-2);
}
.metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  line-height: 0.98;
  letter-spacing: 0.01em;
  color: color-mix(in srgb, var(--color-ink) 56%, #ffffff);
}
.metric__label {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.note {
  margin: var(--space-3) 0;
  padding: var(--space-2) var(--space-3);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: linear-gradient(90deg, color-mix(in srgb, var(--color-primary) 13%, transparent), transparent 68%);
  color: color-mix(in srgb, var(--color-ink) 88%, #ffffff);
}
.note--accent { border-left-color: var(--color-accent); }
.note p:last-child { margin-bottom: 0; }

/* ============ 区块 ============ */
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt {
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}
.section--paper {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: 1px solid var(--color-contrast-line);
  border-bottom: 1px solid var(--color-contrast-line);
}
.section--paper h1,
.section--paper h2,
.section--paper h3,
.section--paper h4,
.section--paper h5 { color: var(--color-contrast-ink); }
.section--paper a { color: var(--color-contrast-accent); }
.section--paper a:hover { color: color-mix(in srgb, var(--color-contrast-accent) 70%, #000000); }
.section--paper .muted { color: color-mix(in srgb, var(--color-contrast-ink) 62%, #ffffff); }
.section--paper .rule { border-top-color: var(--color-contrast-line); }
.section--paper :focus-visible { outline-color: var(--color-contrast-accent); }

/* ============ 分隔语言 ============ */
.rule {
  height: 0;
  margin: var(--space-4) 0;
  border: 0;
  border-top: 1px dashed var(--color-line);
}
.rule--solid { border-top-style: solid; }
.rule--primary { border-top-color: color-mix(in srgb, var(--color-primary) 70%, transparent); }
.rule--ticks {
  height: 8px;
  border: 0;
  margin: var(--space-4) 0;
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 20px);
  background-repeat: repeat-x;
  background-position: left bottom;
  background-size: 100% 6px;
}

/* ============ 色块托底与展签 ============ */
.plate {
  background: var(--color-surface-deep);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 42%, var(--color-line));
  border-radius: var(--radius-md);
  padding: var(--space-3);
  box-shadow: var(--shadow-1);
}
.plate__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  margin: 0 0 var(--space-1);
  color: color-mix(in srgb, var(--color-ink) 74%, #ffffff);
}
.plate__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-soft);
  margin: 0;
}

.exhibit {
  position: relative;
  display: grid;
  grid-template-columns: minmax(96px, 0.6fr) minmax(0, 3fr);
  gap: var(--space-2) var(--space-3);
  align-items: start;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface) 86%, transparent);
  transition: background-color 160ms ease-out;
}
.exhibit::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-2);
  bottom: var(--space-2);
  width: 2px;
  background: var(--color-line);
  transition: width 160ms ease-out, background-color 160ms ease-out;
}
.exhibit:hover { background: var(--color-surface-alt); }
.exhibit:hover::before { width: 4px; background: var(--color-primary); }
.exhibit:focus-within::before { width: 4px; background: var(--color-focus); }
.exhibit__id {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
  padding-top: 4px;
}
.exhibit__body { min-width: 0; }
.exhibit__name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 76%, #ffffff);
  margin: 0 0 6px;
  text-decoration: none;
}
a.exhibit__name:hover { color: color-mix(in srgb, var(--color-primary) 40%, #ffffff); text-decoration: none; }
.exhibit__meta {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}
.exhibit__note {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 160ms ease-out, max-height 160ms ease-out;
}
.exhibit:hover .exhibit__note,
.exhibit:focus-within .exhibit__note { opacity: 1; max-height: 4em; }

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 9px 3px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-surface) 72%, transparent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}
.status[data-status="verified"] {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 52%, var(--color-line));
  background: var(--color-highlight);
}
.status[data-status="pending"] { color: var(--color-ink-soft); }
.status[data-status="superseded"] { color: var(--color-ink-muted); }

.chip {
  display: inline-block;
  padding: 3px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
  background: var(--color-surface-alt);
}

/* ============ 交互组件 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 58%, var(--color-line));
  border-radius: var(--radius-sm);
  background: transparent;
  color: color-mix(in srgb, var(--color-primary) 46%, #ffffff);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 160ms ease-out, border-color 160ms ease-out, color 160ms ease-out;
}
.btn:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
}
.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) 80%, #ffffff); color: var(--color-primary-ink); }
.btn--ghost { border-color: var(--color-line); color: var(--color-ink); }
.btn--ghost:hover { background: var(--color-surface-alt); border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line)); color: #ffffff; }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}
.filter-btn {
  padding: 6px 13px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background-color 160ms ease-out, border-color 160ms ease-out, color 160ms ease-out;
}
.filter-btn:hover { background: var(--color-surface-alt); color: var(--color-ink); }
.filter-btn[aria-pressed="true"] {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: #ffffff;
}

.toc {
  border-left: var(--border-thin) solid var(--color-line);
  padding-left: var(--space-3);
}
.toc__link {
  display: block;
  padding: 7px 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: 1px dashed transparent;
  transition: color 160ms ease-out, border-color 160ms ease-out;
}
.toc__link:hover { color: var(--color-ink); text-decoration: none; }
.toc__link[aria-current="true"] {
  color: #ffffff;
  border-bottom-color: var(--color-primary);
}

.entry {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  margin-bottom: var(--space-2);
  overflow: hidden;
  transition: border-color 160ms ease-out;
}
.entry > summary {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 76%, #ffffff);
}
.entry > summary::-webkit-details-marker { display: none; }
.entry > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--color-ink-soft);
}
.entry[open] { border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line)); }
.entry[open] > summary { border-bottom: 1px dashed var(--color-line); }
.entry[open] > summary::after { content: "–"; color: var(--color-accent); }
.entry__body { padding: var(--space-3); color: var(--color-ink); }

.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.breadcrumb li { margin: 0; }
.breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--color-ink-muted);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.data-table th,
.data-table td {
  text-align: left;
  padding: 10px var(--space-2);
  border-bottom: 1px dashed var(--color-line);
  vertical-align: top;
}
.data-table thead th {
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  font-weight: var(--weight-body);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
}
.data-table tbody tr:hover { background: color-mix(in srgb, var(--color-surface-alt) 70%, transparent); }

/* ============ 图片容器 ============ */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-1);
}
.media-frame > img,
.media-frame > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--std { aspect-ratio: 4 / 3; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--band { aspect-ratio: 21 / 9; }
.media-frame--plain { aspect-ratio: auto; }
.media-frame__caption {
  padding: var(--space-2) var(--space-3);
  border-top: 1px dashed var(--color-line);
  background: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}
.scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media-overlay {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
}

/* ============ skip link ============ */
.skip-link {
  position: fixed;
  top: -80px;
  left: var(--space-3);
  z-index: 90;
  padding: 10px 18px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: top 160ms ease-out;
}
.skip-link:focus { top: var(--space-2); text-decoration: none; }

/* ============ 页头 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--color-surface) 94%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--space-3);
  transition: padding 180ms ease-out;
}
.site-header.is-scrolled .site-header__inner { padding-block: 12px; }

.brand-block {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  min-width: 0;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-ink) 74%, #ffffff);
  white-space: nowrap;
  text-decoration: none;
}
.brand:hover { color: color-mix(in srgb, var(--color-primary) 38%, #ffffff); text-decoration: none; }
.brand__sub {
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  color: var(--color-ink-soft);
}
.brand__sep { color: var(--color-primary); }
.brand-batch {
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
  white-space: nowrap;
  transition: opacity 180ms ease-out;
}
.site-header.is-scrolled .brand-batch { opacity: 0.72; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background-color 160ms ease-out, border-color 160ms ease-out;
}
.nav-toggle:hover { background: var(--color-surface-alt); border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line)); }
.nav-toggle__bars {
  width: 14px;
  height: 8px;
  background-image: linear-gradient(var(--color-primary), var(--color-primary)), linear-gradient(var(--color-ink-soft), var(--color-ink-soft));
  background-size: 100% 1px, 100% 1px;
  background-position: 0 0, 0 100%;
  background-repeat: no-repeat;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list li { margin: 0; }
.nav-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 2px;
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 160ms ease-out, border-color 160ms ease-out;
}
.nav-list a:hover { color: color-mix(in srgb, var(--color-primary) 42%, #ffffff); border-bottom-color: var(--color-primary); text-decoration: none; }
.nav-list a[aria-current="page"] {
  color: color-mix(in srgb, var(--color-ink) 82%, #ffffff);
  border-bottom-color: var(--color-primary);
}
.nav-list a[aria-current="page"]::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
  flex: none;
}
.nav-erratum {
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.nav-erratum:hover { color: var(--color-accent); text-decoration: none; }

.header-scale {
  position: relative;
  height: 7px;
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 32px);
  background-repeat: repeat-x;
  background-position: left bottom;
  background-size: 100% 7px;
}
.header-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  transition: transform 120ms linear;
}

/* ============ 页脚 ============ */
.site-footer {
  margin-top: var(--section-y-lg);
  background: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-scale {
  height: 14px;
  background-image:
    repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 28px),
    repeating-linear-gradient(90deg, var(--color-primary) 0 1px, transparent 1px 140px);
  background-repeat: repeat-x;
  background-position: bottom left, bottom left;
  background-size: 100% 7px, 100% 14px;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.footer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px dashed var(--color-line);
}
.footer-brand { max-width: 52ch; }
.footer-brand__name {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 74%, #ffffff);
}
.footer-brand__note {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.footer-stats {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-ink-soft);
}
.footer-stats__sep {
  width: 26px;
  height: 1px;
  background: var(--color-primary);
  align-self: center;
}
.footer-stats__unit { font-size: var(--text-xs); color: var(--color-ink-muted); }

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  padding-block: var(--space-6);
}
.footer-col__title {
  margin: 0 0 var(--space-2);
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.22em;
  color: var(--color-ink-soft);
}
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li { margin: 0 0 6px; }
.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.footer-links a:hover { color: color-mix(in srgb, var(--color-primary) 42%, #ffffff); }
.footer-links a[aria-current="page"] { color: #ffffff; }

.footer-contact { list-style: none; margin: 0; padding: 0; }
.footer-contact li {
  display: flex;
  gap: var(--space-2);
  align-items: baseline;
  margin-bottom: 8px;
  font-size: var(--text-sm);
  color: var(--color-ink);
}
.footer-contact__key {
  flex: none;
  width: 40px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.footer-rail {
  background: var(--color-contrast-surface);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.footer-rail__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-ink);
}
.footer-rail__link { color: var(--color-contrast-accent); }
.footer-rail__link:hover { color: color-mix(in srgb, var(--color-contrast-accent) 70%, #000000); }
.footer-rail__icp { color: color-mix(in srgb, var(--color-contrast-ink) 70%, #ffffff); }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .nav-list { gap: var(--space-2); }
  .site-nav { gap: var(--space-3); }
}

@media (max-width: 880px) {
  html { scroll-padding-top: 88px; }
  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }

  .site-header__inner { padding: var(--space-2) var(--space-3); }
  .site-header.is-scrolled .site-header__inner { padding-block: var(--space-2); }
  .brand { font-size: var(--text-base); }
  .brand-batch { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-3);
    background: var(--color-surface-alt);
    border-top: var(--border-thin) solid var(--color-line);
    border-bottom: var(--border-thin) solid var(--color-line);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open="true"] { display: flex; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-list li { border-bottom: 1px dashed var(--color-line); }
  .nav-list a { padding: 14px 4px; font-size: var(--text-base); border-bottom: 0; }
  .nav-list a[aria-current="page"] { border-bottom: 0; }
  .nav-erratum {
    margin-top: var(--space-3);
    padding: 14px 4px;
    border-left: 0;
    border-top: 1px dashed var(--color-line);
    font-size: var(--text-base);
  }

  .grid { row-gap: var(--space-3); }
  .span-3, .span-4, .span-5,
  .span-6, .span-7, .span-8, .span-9 { grid-column: span 12; }

  .exhibit { grid-template-columns: 1fr; gap: 6px; }
  .exhibit__note { opacity: 1; max-height: 6em; }

  .footer-head { flex-direction: column; align-items: flex-start; }
  .footer-grid { padding-block: var(--space-4); }
  .footer-rail__inner { justify-content: flex-start; }
}

@media (max-width: 560px) {
  .container { padding-inline: var(--space-2); }
  .brand { font-size: var(--text-sm); letter-spacing: 0.04em; }
  .brand__sub { font-size: var(--text-xs); letter-spacing: 0.12em; }
  .btn { width: 100%; justify-content: center; }
  .footer-contact li { flex-direction: column; gap: 2px; }
  .footer-contact__key { width: auto; }
}