:root {
  --color-surface: #fdfdfd;
  --color-surface-alt: #f4f4f4;
  --color-surface-deep: #e8e7e7;
  --color-ink: #524749;
  --color-ink-soft: #7a6b6e;
  --color-ink-muted: #87787b;
  --color-line: #dedcdd;
  --color-primary: #956a72;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #eee8ea;
  --color-accent: #d42b4a;
  --color-accent-ink: #ffffff;
  --color-highlight: #f6d7dd;
  --color-focus: #e11e42;
  --color-contrast-surface: #1b1818;
  --color-contrast-ink: #e7e4e5;
  --color-contrast-line: #484545;
  --color-contrast-accent: #dc516a;
  --overlay-scrim: linear-gradient(180deg, rgba(27, 24, 24, 0.35) 0%, rgba(27, 24, 24, 0.72) 55%, rgba(27, 24, 24, 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: 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(49px, 10.1vw, 129px);
  --text-figure: clamp(41px, 7.3vw, 93px);
  --weight-heading: 395;
  --weight-body: 400;
  --leading-body: 1.81;
  --leading-heading: 1.19;
  --tracking-heading: 0.007em;
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-pill: 0px;
  --border-thin: 1px;
  --border-thick: 1px;
  --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: 1080px;
  --measure: 58ch;
  --gutter: 24px;
  --section-y: 114px;
  --section-y-lg: 160px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, pre { margin: 0; }

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

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

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

table { border-collapse: collapse; }

/* ---------- 排版 ---------- */
h1, h2, h3, h4,
.display, .section-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.display {
  font-size: var(--text-display);
  margin: 0;
}

.section-title { font-size: var(--text-lg); margin: 0; }

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

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: var(--text-figure);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0 8px;
}

.figure-unit {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
}

.caption {
  font-size: var(--text-sm);
  line-height: 1.62;
  color: var(--color-ink-soft);
}

.caption-num {
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
  margin-right: 6px;
  letter-spacing: 0.08em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  flex: 0 0 auto;
  background: currentColor;
}

.mark {
  background-image: linear-gradient(var(--color-highlight), var(--color-highlight));
  background-repeat: no-repeat;
  background-size: 100% 62%;
  background-position: 0 82%;
}

.ul-accent {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

::selection {
  background: var(--color-highlight);
  color: var(--color-ink);
}

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

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  left: var(--space-3);
  top: -120px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top 120ms linear;
}

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

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-inner {
  position: relative;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 56px;
  display: flex;
  align-items: stretch;
  gap: var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding-right: var(--space-3);
  border-right: var(--border-thin) solid var(--color-line);
  text-decoration: none;
  color: var(--color-ink);
}

.brand-mark {
  width: 26px;
  height: 26px;
  flex: 0 0 auto;
  border: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface-alt);
  background-image:
    linear-gradient(var(--color-primary), var(--color-primary)),
    linear-gradient(var(--color-primary), var(--color-primary));
  background-repeat: no-repeat, no-repeat;
  background-size: 1px 100%, 100% 1px;
  background-position: center center, center center;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: calc(var(--text-base) * 0.96);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  color: var(--color-ink);
}

.brand-meta {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

.nav-bar {
  display: flex;
  align-items: stretch;
  flex: 1 1 auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: stretch;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav-list::-webkit-scrollbar { display: none; }

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 7px;
  height: 56px;
  padding: 0 13px;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color 120ms linear, background-color 120ms linear;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: calc(var(--text-xs) * 1.35);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  transition: color 120ms linear;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 0;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--color-ink); }

.nav-link:hover .nav-index,
.nav-link:focus-visible .nav-index { color: var(--color-accent); }

.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--color-ink);
  background: var(--color-primary-soft);
}

.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--color-primary);
}

.nav-link[aria-current="page"] .nav-index { color: var(--color-primary); }

.header-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--color-primary);
}

.status-dot[data-state="pending"] { background: var(--color-accent); }
.status-dot[data-state="live"] { background: var(--color-focus); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  height: 56px;
  padding: 0 0 0 16px;
  border: 0;
  border-left: var(--border-thin) solid var(--color-line);
  background: none;
  color: var(--color-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  cursor: pointer;
}

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle-bars i {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 160ms linear, opacity 160ms linear;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: var(--section-y);
  padding-top: var(--section-y);
  background: var(--color-surface);
  border-top: var(--border-thin) solid var(--color-line);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.footer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.08em;
  color: var(--color-ink);
}

.footer-note {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4) var(--gutter);
  padding: var(--space-6) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.footer-col { min-width: 0; }

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.footer-col-title::before {
  content: "";
  width: 14px;
  height: 1px;
  flex: 0 0 auto;
  background: var(--color-primary);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-link {
  position: relative;
  display: inline-block;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 120ms linear;
}

.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.footer-link:hover,
.footer-link:focus-visible { color: var(--color-ink); }

.footer-link:hover::after,
.footer-link:focus-visible::after { transform: scaleX(1); }

.footer-contact {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
  font-variant-numeric: tabular-nums;
}

.footer-contact--addr {
  font-family: var(--font-body);
  color: var(--color-ink-muted);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px var(--space-2);
  padding-top: var(--space-3);
  padding-bottom: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

.footer-link--legal {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.sep {
  font-family: var(--font-mono);
  color: var(--color-line);
}

/* ---------- 容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

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

.span-full { grid-column: 1 / -1; }

.section { padding: var(--section-y) 0; }
.section--lg { padding: var(--section-y-lg) 0; }

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--color-line);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 22px;
  border: var(--border-thin) solid var(--color-primary);
  background: transparent;
  color: var(--color-ink);
  font-size: var(--text-base);
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 120ms linear, color 120ms linear, border-color 120ms linear;
}

.btn::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  transition: transform 120ms linear;
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.btn:hover::after,
.btn:focus-visible::after { transform: translateX(4px); }

.btn--solid {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

/* ---------- 图片衬底 ---------- */
.frame {
  position: relative;
  padding: var(--space-2);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
}

.frame-body {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-surface-deep);
}

.frame-body > img,
.frame-body > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.frame-body--grid::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--color-contrast-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--color-contrast-line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.22;
}

.frame-scrim {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 6px;
  padding: var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
}

.frame-scrim .caption,
.frame-scrim .figure-unit { color: var(--color-contrast-ink); }

.frame-caption {
  display: flex;
  gap: 8px;
  padding-top: 10px;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 深底焦点区 ---------- */
.focus-panel {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.focus-panel .display,
.focus-panel .section-title,
.focus-panel .figure,
.focus-panel .num { color: var(--color-contrast-ink); }

.focus-panel .eyebrow { color: var(--color-contrast-accent); }

.focus-panel .caption,
.focus-panel .lead,
.focus-panel .figure-unit,
.focus-panel .brand-meta {
  color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent);
}

.focus-panel .rule,
.focus-panel hr {
  background: var(--color-contrast-line);
  border-color: var(--color-contrast-line);
}

.focus-panel a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-contrast-line);
  transition: border-color 120ms linear, color 120ms linear;
}

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

.focus-panel .status-dot { background: var(--color-contrast-accent); }

/* ---------- 数据表 ---------- */
.table-scroll {
  overflow-x: auto;
  overflow-y: visible;
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  -webkit-overflow-scrolling: touch;
}

.table-scroll table {
  width: 100%;
  min-width: 640px;
  font-size: var(--text-sm);
}

.table-scroll th,
.table-scroll td {
  padding: 12px 16px;
  text-align: left;
  white-space: nowrap;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-weight: var(--weight-body);
}

.table-scroll thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  letter-spacing: 0.1em;
}

.table-scroll th:first-child,
.table-scroll td:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--color-surface);
  border-right: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
}

.table-scroll thead th:first-child {
  z-index: 3;
  background: var(--color-surface-deep);
}

.table-scroll tbody tr:hover td { background: var(--color-surface-alt); }
.table-scroll tbody tr:hover td:first-child { background: var(--color-surface-alt); }

.table-scroll td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.table-scroll tbody tr:last-child td { border-bottom: 0; }

/* ---------- 折叠档案卡 ---------- */
.fold {
  border-bottom: var(--border-thin) solid var(--color-line);
  background: transparent;
}

.fold > summary {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  list-style: none;
  cursor: pointer;
  color: var(--color-ink);
  transition: color 120ms linear;
}

.fold > summary::-webkit-details-marker { display: none; }

.fold > summary:hover { color: var(--color-primary); }

.fold-summary-idx {
  flex: 0 0 auto;
  min-width: 3em;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.fold-summary-title {
  flex: 1 1 auto;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.fold-summary-hint {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.fold > summary::after {
  content: "＋";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.fold[open] > summary::after {
  content: "－";
  color: var(--color-primary);
}

.fold[open] > summary { border-left: 3px solid var(--color-primary); padding-left: var(--space-2); }

.fold-body {
  display: grid;
  gap: var(--space-2);
  max-width: var(--measure);
  padding: 0 0 var(--space-4);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.fold[open] > .fold-body {
  animation: foldIn 200ms ease-out;
}

@keyframes foldIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 标签筛选 ---------- */
.tag {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px 6px 14px;
  border: var(--border-thin) solid var(--color-line);
  background: transparent;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 120ms linear, color 120ms linear, border-color 120ms linear;
}

.tag:hover,
.tag:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-ink);
}

.tag.is-active,
.tag[aria-pressed="true"] {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-ink);
}

.tag.is-active::before,
.tag[aria-pressed="true"]::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  bottom: -1px;
  width: 3px;
  background: var(--color-primary);
}

/* ---------- 吸附锚点条 ---------- */
.anchor-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  background: var(--color-surface);
  border-top: var(--border-thin) solid var(--color-line);
  transform: translateY(101%);
  transition: transform 200ms ease-out;
}

.anchor-bar[data-visible] { transform: translateY(0); }

.anchor-bar-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 46px;
  overflow-x: auto;
  scrollbar-width: none;
}

.anchor-bar-inner::-webkit-scrollbar { display: none; }

.anchor-link {
  flex: 0 0 auto;
  padding: 2px 0;
  border-bottom: 2px solid transparent;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color 120ms linear, border-color 120ms linear;
}

.anchor-link:hover,
.anchor-link:focus-visible,
.anchor-link[aria-current="true"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

/* ---------- 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: var(--gutter);
  bottom: 62px;
  z-index: 75;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 160ms linear, visibility 160ms linear, color 120ms linear, border-color 120ms linear;
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
}

.to-top:hover,
.to-top:focus-visible {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .brand-meta { display: none; }
  .header-meta .meta-time { display: none; }
}

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

  .section { padding: var(--section-y) 0; }

  .site-footer {
    margin-top: var(--space-8);
    padding-top: var(--space-8);
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .header-inner { gap: var(--space-2); }

  .brand {
    border-right: 0;
    padding-right: 0;
  }

  .nav-toggle {
    display: flex;
    margin-left: 0;
  }

  .header-meta {
    order: 2;
    margin-left: auto;
    padding-left: 0;
    border-left: 0;
    gap: 6px;
  }

  .nav-bar {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    padding: var(--space-1) 0;
    max-height: 76vh;
    overflow-y: auto;
    background: var(--color-surface);
    border-top: var(--border-thin) solid var(--color-line);
    border-bottom: var(--border-thin) solid var(--color-line);
  }

  .nav-bar[data-open] { display: flex; }

  .nav-list {
    flex-direction: row;
    flex-wrap: nowrap;
    gap: var(--space-1);
    padding: 0 var(--gutter);
    overflow-x: auto;
  }

  .nav-item { flex: 0 0 auto; }

  .nav-link {
    height: 44px;
    padding: 0 14px;
    border: var(--border-thin) solid var(--color-line);
  }

  .nav-link::after { display: none; }

  .nav-link:hover,
  .nav-link:focus-visible {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
  }

  .nav-link[aria-current="page"] { border-color: var(--color-primary); }
}

@media (max-width: 560px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .footer-head { flex-direction: column; align-items: flex-start; }

  .brand-name { font-size: var(--text-sm); letter-spacing: 0.12em; }

  .to-top { bottom: 58px; right: var(--space-2); }

  .fold > summary { gap: var(--space-1); }

  .fold-summary-idx { min-width: 2.4em; }
}

/* ---------- 动效降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }
}