:root {
  --color-surface: #191a19;
  --color-surface-alt: #2a2b2a;
  --color-surface-deep: #3e403f;
  --color-ink: #d3d9d7;
  --color-ink-soft: #8d9b96;
  --color-ink-muted: #798682;
  --color-line: #3a3c3b;
  --color-primary: #29d69e;
  --color-primary-ink: #111816;
  --color-primary-soft: #1b342c;
  --color-accent: #2bd49e;
  --color-accent-ink: #111816;
  --color-highlight: #1c3b31;
  --color-focus: #1ee1a2;
  --color-contrast-surface: #edeeee;
  --color-contrast-ink: #2e3331;
  --color-contrast-line: #c3c5c4;
  --color-contrast-accent: #187758;
  --overlay-scrim: linear-gradient(180deg, rgba(237, 238, 238, 0.35) 0%, rgba(237, 238, 238, 0.72) 55%, rgba(237, 238, 238, 0.92) 100%);
  --font-heading: ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", monospace;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 14.6px;
  --text-base: 16px;
  --text-lg: 19.2px;
  --text-xl: 23.0px;
  --text-2xl: 27.6px;
  --text-3xl: 33.2px;
  --text-4xl: 39.8px;
  --text-display: clamp(43px, 8.8vw, 113px);
  --text-figure: clamp(36px, 6.3vw, 81px);
  --weight-heading: 605;
  --weight-body: 400;
  --leading-body: 1.65;
  --leading-heading: 1.16;
  --tracking-heading: 0.027em;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;
  --radius-pill: 6px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 6px;
  --space-2: 12px;
  --space-3: 18px;
  --space-4: 24px;
  --space-6: 36px;
  --space-8: 48px;
  --container: 1320px;
  --measure: 72ch;
  --gutter: 12px;
  --section-y: 79px;
  --section-y-lg: 111px;
}

/* ==========================================================
   1. Reset 与基础
   ========================================================== */
*,
*::before,
*::after { box-sizing: border-box; }

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

@media (prefers-reduced-motion: no-preference) {
  html { 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);
  -webkit-font-smoothing: antialiased;
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

table { border-collapse: collapse; }

hr { border: 0; }

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

.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;
}

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

.label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.skip-link {
  position: absolute;
  top: -120px;
  left: var(--space-3);
  z-index: 200;
  padding: 9px 16px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-heading);
  border-radius: var(--radius-md);
  transition: top 140ms ease;
}

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

/* ==========================================================
   2. 布局骨架
   ========================================================== */
.shell {
  width: min(100% - 2 * var(--space-4), var(--container));
  margin-inline: auto;
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }

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

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

.index-rail {
  grid-column: 1 / span 2;
  position: sticky;
  top: 116px;
  align-self: start;
  padding-right: var(--space-3);
  border-right: var(--border-thin) dotted var(--color-line);
}

.content-area {
  grid-column: 3 / span 10;
  min-width: 0;
}

.index-list { display: grid; gap: 1px; }

.index-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0 7px 10px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-muted);
  transition: color 140ms ease, border-color 140ms ease;
}

.index-link:hover { color: var(--color-ink); }

.index-link[aria-current="true"],
.index-link.is-active {
  color: var(--color-ink);
  border-left-color: var(--color-primary);
}

.index-num { color: var(--color-ink-muted); }
.index-link[aria-current="true"] .index-num,
.index-link.is-active .index-num { color: var(--color-primary); }

/* ==========================================================
   3. 排版与分节
   ========================================================== */
.lede {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink);
  max-width: var(--measure);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.section-title {
  font-size: var(--text-2xl);
  letter-spacing: 0.05em;
}

.rule-thick {
  margin: 0 0 var(--space-4);
  border-top: 3px solid var(--color-primary);
}

.rule-double {
  height: 3px;
  margin: var(--space-4) 0;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.rule-dotted {
  margin: var(--space-4) 0;
  border-top: var(--border-thin) dotted var(--color-line);
}

.panel {
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-1);
}

.panel--deep { background: var(--color-surface-deep); }
.panel--accent {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 42%, transparent);
}

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

.prose h2,
.prose h3 {
  margin: var(--space-6) 0 var(--space-2);
  font-size: var(--text-xl);
}

.prose h2:first-child,
.prose h3:first-child { margin-top: 0; }

.prose p + p { margin-top: var(--space-2); }

.callout {
  border-left: 3px solid var(--color-primary);
  background: var(--color-primary-soft);
  padding: var(--space-3) var(--space-4);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-ink);
  font-size: var(--text-sm);
}

/* ==========================================================
   4. 列表 / 表格 / 标签页
   ========================================================== */
.list-row {
  position: relative;
  display: block;
  padding: var(--space-2) var(--space-2) var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) dotted var(--color-line);
  transition: background-color 140ms ease;
}

.list-row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--color-primary);
  transform: scaleY(0);
  transform-origin: center;
  transition: transform 140ms ease;
}

.list-row:hover { background: var(--color-surface-alt); }
.list-row:hover::before { transform: scaleY(1); }

.data-table {
  width: 100%;
  font-size: var(--text-sm);
  line-height: 1.5;
  box-shadow: var(--shadow-1);
}

.data-table caption {
  padding-bottom: var(--space-2);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-muted);
}

.data-table th,
.data-table td {
  padding: 9px var(--space-2);
  text-align: left;
  border-bottom: var(--border-thin) dotted var(--color-line);
  vertical-align: top;
}

.data-table thead th {
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.data-table tbody tr { transition: background-color 140ms ease; }
.data-table tbody tr:hover { background: var(--color-surface-alt); }

.data-table .num { text-align: right; }

.data-table--fixed thead th { position: sticky; top: 0; z-index: 2; }

.tabs-group { display: block; }

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  width: fit-content;
  max-width: 100%;
  padding: 3px;
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
}

.tab {
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-muted);
  transition: color 140ms ease, background-color 140ms ease;
}

.tab:hover { color: var(--color-ink); }

.tab[aria-selected="true"] {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.tabpanel { padding-top: var(--space-4); }
.tabpanel[hidden] { display: none; }

@media (prefers-reduced-motion: no-preference) {
  .tabpanel { animation: panel-in 160ms ease both; }
}

@keyframes panel-in {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: none; }
}

/* ==========================================================
   5. 按钮 / 面包屑
   ========================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--color-surface-alt);
  color: var(--color-ink);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-heading);
  transition: background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}

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

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

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

.btn--ghost { background: transparent; }

.crumbs { padding-block: var(--space-3); }

.crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-muted);
}

.crumbs-item + .crumbs-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-line);
}

.crumbs-item a:hover { color: var(--color-primary); }
.crumbs-item[aria-current="page"] { color: var(--color-ink); }

/* ==========================================================
   6. 数据展示与图片容器
   ========================================================== */
.stat {
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-2);
}

.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  letter-spacing: var(--tracking-heading);
  color: var(--color-primary);
}

.stat-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-muted);
}

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 0;
  background: var(--color-surface-deep);
  aspect-ratio: 16 / 9;
}

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

.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3) var(--space-4);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
}

@media (min-width: 961px) {
  .media-frame--bleed {
    width: calc(100% + 2 * var(--space-4));
    margin-left: calc(-1 * var(--space-4));
  }
}

/* ==========================================================
   7. 头部
   ========================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-inner {
  width: min(100% - 2 * var(--space-3), var(--container));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-2);
  transition: padding 160ms ease;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  white-space: nowrap;
}

.brand-mark { color: var(--color-ink); }
.brand-slash { color: var(--color-primary); }

.brand-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  flex: none;
}

.brand-name {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.primary-nav {
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 3px;
  transition: padding 160ms ease, background-color 160ms ease;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  white-space: nowrap;
  transition: color 140ms ease, background-color 140ms ease;
}

.nav-link:hover { color: var(--color-ink); background: var(--color-surface-deep); }

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

.nav-link[aria-current="page"]::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-right: 7px;
  border-radius: 50%;
  background: var(--color-primary);
  flex: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-soft);
}

.site-header[data-open] .nav-toggle {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.nav-toggle-icon {
  position: relative;
  display: inline-block;
  width: 12px;
  height: 8px;
  flex: none;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform 150ms ease;
}

.nav-toggle-icon::before { top: 0; }
.nav-toggle-icon::after { bottom: 0; }

.site-header[data-open] .nav-toggle-icon::before { transform: translateY(3.5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-icon::after { transform: translateY(-3.5px) rotate(-45deg); }

.status-strip {
  height: 32px;
  overflow: hidden;
  background: var(--color-surface-alt);
  border-top: var(--border-thin) dotted var(--color-line);
  transition: height 160ms ease, opacity 140ms ease, border-color 140ms ease;
}

.status-inner {
  width: min(100% - 2 * var(--space-3), var(--container));
  height: 32px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-muted);
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

.status-inner::-webkit-scrollbar { display: none; }

.status-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-ink);
  flex: none;
}

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

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  flex: none;
}

@media (prefers-reduced-motion: no-preference) {
  .status-dot { animation: dot-breathe 2.4s ease-in-out infinite; }
}

@keyframes dot-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.status-sep {
  width: 1px;
  height: 12px;
  background: var(--color-line);
  flex: none;
}

.status-spacer { flex: 1 1 auto; min-width: var(--space-2); }

.status-links {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  flex: none;
}

.status-link {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) dotted transparent;
  transition: color 140ms ease, border-color 140ms ease;
}

.status-link:hover,
.status-link:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.site-header[data-scrolled] .status-strip {
  height: 0;
  opacity: 0;
  border-top-color: transparent;
}

.site-header[data-scrolled] .header-inner { padding-block: 5px; }

.site-header[data-scrolled] .primary-nav { padding: 2px; }

/* ==========================================================
   8. 页脚
   ========================================================== */
.site-footer {
  margin-top: var(--section-y);
  background: var(--color-surface);
}

.footer-masthead {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding: var(--space-6) 0 var(--space-4);
  border-top: 3px solid var(--color-primary);
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.footer-brand-slash { color: var(--color-primary); }

.footer-tagline {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.footer-round {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
}

.footer-panel {
  --fp-line: var(--color-contrast-line);
  --fp-accent: var(--color-contrast-accent);
  --fp-soft: var(--color-contrast-ink);
  padding: var(--space-6) var(--space-4);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  border-right: var(--border-thin) solid var(--color-contrast-line);
}

.footer-panel:last-child { border-right: 0; }

.footer-panel--dark {
  --fp-line: var(--color-line);
  --fp-accent: var(--color-primary);
  --fp-soft: var(--color-ink-soft);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  border-top-color: var(--color-line);
  border-bottom-color: var(--color-line);
  border-right-color: var(--color-line);
}

.footer-panel-title {
  margin: 0 0 var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--fp-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fp-accent);
}

.footer-list { display: grid; gap: 1px; }

.footer-list--links { gap: 2px; }

.footer-kv {
  display: flex;
  gap: var(--space-2);
  align-items: baseline;
  padding: 6px 0;
  border-bottom: var(--border-thin) dotted var(--fp-line);
  font-size: var(--text-sm);
}

.footer-kv:last-child { border-bottom: 0; }

.footer-kv-key {
  flex: none;
  min-width: 4.6em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--fp-soft);
}

.footer-kv-val {
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.footer-link {
  display: inline-block;
  padding: 4px 0;
  font-size: var(--text-sm);
  color: inherit;
  border-bottom: var(--border-thin) dotted transparent;
  transition: color 140ms ease, border-color 140ms ease;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--fp-accent);
  border-bottom-color: var(--fp-accent);
}

.footer-panel-note {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) dotted var(--fp-line);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--fp-soft);
}

.footer-base {
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.footer-base-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-block: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-muted);
}

.footer-legal,
.footer-copy { margin: 0; }

/* ==========================================================
   9. 响应式
   ========================================================== */
@media (max-width: 1200px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-panel:nth-child(2) { border-right: 0; }
  .footer-panel:nth-child(n + 3) { border-top-color: transparent; }
}

@media (max-width: 960px) {
  .console-layout { grid-template-columns: minmax(0, 1fr); }

  .index-rail,
  .content-area { grid-column: 1 / -1; }

  .index-rail {
    position: static;
    padding-right: 0;
    margin-bottom: var(--space-4);
    border-right: 0;
    border-bottom: var(--border-thin) dotted var(--color-line);
    padding-bottom: var(--space-2);
  }

  .index-list {
    display: flex;
    gap: 2px;
    overflow-x: auto;
    scrollbar-width: none;
  }

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

  .index-link {
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 7px 10px;
    white-space: nowrap;
  }

  .index-link[aria-current="true"],
  .index-link.is-active {
    border-left-color: transparent;
    border-bottom-color: var(--color-primary);
  }

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

  .brand-name { display: none; }

  .primary-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: var(--space-3);
    right: var(--space-3);
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 150ms ease, transform 150ms ease, visibility 150ms;
  }

  .site-header[data-open] .primary-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    padding: 11px 12px;
    border-radius: var(--radius-md);
    font-size: var(--text-base);
  }

  .status-strip { height: 30px; }
  .status-inner { height: 30px; }
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-panel { border-right: 0; }
  .footer-panel + .footer-panel { border-top-color: transparent; }
  .footer-panel:nth-child(n + 3) { border-top-color: transparent; }
  .footer-panel:first-child { border-top-color: var(--color-contrast-line); }
  .footer-panel--dark:first-child { border-top-color: var(--color-line); }

  .status-links { display: none; }
  .status-spacer { min-width: 0; }

  .footer-round { margin-left: 0; }

  .section-head { gap: var(--space-2); }
}

@media (max-width: 520px) {
  .shell,
  .header-inner,
  .status-inner { width: calc(100% - 2 * var(--space-3)); }

  .footer-masthead { gap: var(--space-2); }
  .btn { width: 100%; justify-content: center; }
}

/* ==========================================================
   10. 动效降级
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .status-dot { animation: none; opacity: 1; }
  .tabpanel { animation: none; }
}