:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f1f1f2;
  --color-surface-deep: #e4e5e6;
  --color-ink: #444750;
  --color-ink-soft: #6b6f7a;
  --color-ink-muted: #787c87;
  --color-line: #d9dadb;
  --color-primary: #4261bd;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e0e5f1;
  --color-accent: #cd4b28;
  --color-accent-ink: #ffffff;
  --color-highlight: #f2dad4;
  --color-focus: #cc401a;
  --color-contrast-surface: #181b25;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #454750;
  --color-contrast-accent: #d95c3b;
  --overlay-scrim: linear-gradient(180deg, rgba(24, 27, 37, 0.35) 0%, rgba(24, 27, 37, 0.72) 55%, rgba(24, 27, 37, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 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(34px, 4.3vw, 55px);
  --text-figure: clamp(28px, 3.1vw, 40px);
  --weight-heading: 617;
  --weight-body: 400;
  --leading-body: 1.63;
  --leading-heading: 1.23;
  --tracking-heading: 0.002em;
  --radius-sm: 8px;
  --radius-md: 8px;
  --radius-lg: 9px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(68, 71, 80, 0.08);
  --shadow-2: 0 18px 44px rgba(68, 71, 80, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1220px;
  --measure: 69ch;
  --gutter: 16px;
  --section-y: 61px;
  --section-y-lg: 85px;
}

/* ===== 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);
  font-variant-numeric: tabular-nums;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
h1 { font-size: clamp(28px, 4vw, var(--text-3xl)); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); }
p { margin: 0 0 var(--space-2); }
p:last-child { margin-bottom: 0; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-focus); text-decoration: underline; text-underline-offset: 0.2em; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; border-radius: 2px; }

/* ===== 通用排版 ===== */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.eyebrow::before { content: ""; width: 18px; height: 2px; background-color: var(--color-accent); }
.lead { font-size: var(--text-lg); line-height: 1.5; color: var(--color-ink-soft); max-width: var(--measure); }
.display-1 {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.06;
  color: var(--color-ink);
}
.figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--color-ink);
}
.prose { max-width: var(--measure); color: var(--color-ink); }
.prose h2 { margin: var(--space-4) 0 var(--space-2); font-size: var(--text-xl); }
.prose h3 { margin: var(--space-3) 0 var(--space-1); font-size: var(--text-lg); }
.prose ul { margin: 0 0 var(--space-2); }
.prose ul li { position: relative; padding-left: 18px; margin-bottom: 6px; }
.prose ul li::before { content: ""; position: absolute; left: 0; top: 0.68em; width: 8px; height: 2px; background-color: var(--color-accent); }
.prose a { border-bottom: 1px solid color-mix(in srgb, var(--color-primary) 45%, transparent); }

/* ===== 布局骨架 ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}
.grid-12 { 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-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }
.section { padding: var(--section-y) 0; }
.section--lg { padding: var(--section-y-lg) 0; }
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.band {
  background-color: var(--color-surface-deep);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
  padding: var(--space-3) 0;
}
.band--contrast {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.band--contrast h2, .band--contrast h3 { color: var(--color-contrast-ink); }
.divider-slash {
  height: 1px;
  border: 0;
  margin: var(--space-3) 0;
  background-image: repeating-linear-gradient(135deg, var(--color-line) 0 6px, transparent 6px 14px);
}

/* ===== 面板 ===== */
.panel {
  position: relative;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  padding: var(--space-3);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.panel--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
  box-shadow: var(--shadow-2);
}
.panel--contrast h2, .panel--contrast h3, .panel--contrast h4 { color: var(--color-contrast-ink); }
.panel--accent {
  background-color: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 38%, var(--color-line));
}
.panel--flush { padding: 0; overflow: hidden; }
.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-1);
  margin-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.panel--contrast .panel-head { border-color: var(--color-contrast-line); }
.panel-title { font-size: var(--text-lg); font-weight: var(--weight-heading); }
.panel-note {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.panel--contrast .panel-note { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.panel-body > * + * { margin-top: var(--space-2); }
.panel-foot {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px dashed var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.panel--contrast .panel-foot { border-color: var(--color-contrast-line); color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent); }
.panel-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
@media (hover: hover) {
  .panel:hover { transform: translateY(-2px); border-color: var(--color-primary); box-shadow: var(--shadow-2); }
  .panel--contrast:hover { border-color: var(--color-contrast-accent); }
}

/* ===== 指标与数据 ===== */
.metric { display: flex; flex-direction: column; gap: 6px; }
.metric-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--color-ink);
}
.panel--contrast .metric-value { color: var(--color-contrast-ink); }
.panel--contrast .metric-value--key { color: var(--color-contrast-accent); }
.metric-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.panel--contrast .metric-label { color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent); }
.metric-delta { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-accent); }
.metric-delta--calm { color: var(--color-primary); }
.stat-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-1) 0;
  border-bottom: 1px dashed var(--color-line);
}
.panel--contrast .stat-row { border-color: var(--color-contrast-line); }
.stat-key { font-size: var(--text-sm); color: var(--color-ink-soft); }
.panel--contrast .stat-key { color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }
.stat-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}
.panel--contrast .stat-val { color: var(--color-contrast-ink); }
.stat-val--accent { color: var(--color-accent); }
.panel--contrast .stat-val--accent { color: var(--color-contrast-accent); }
.stat-val--primary { color: var(--color-primary); }
.table-scroll { overflow-x: auto; border: var(--border-thin) solid var(--color-line); border-radius: var(--radius-md); background-color: var(--color-surface); }
.data-table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); }
.data-table caption {
  text-align: left;
  padding: var(--space-2) var(--space-2) 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.data-table th, .data-table td { padding: 10px var(--space-2); text-align: left; border-bottom: var(--border-thin) solid var(--color-line); }
.data-table thead th {
  background-color: var(--color-primary-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--color-ink);
}
.data-table tbody tr:nth-child(even) { background-color: var(--color-surface-alt); }
.data-table td.num, .data-table th.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; }
.data-table tbody tr[data-state="pending"] { background-color: var(--color-highlight); }
.data-table tbody tr[data-state="pending"] td:first-child { box-shadow: inset 3px 0 0 var(--color-accent); }

/* ===== 状态标签 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface-alt);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.tag--primary { background-color: var(--color-primary-soft); border-color: color-mix(in srgb, var(--color-primary) 42%, transparent); color: var(--color-primary); }
.tag--accent { background-color: var(--color-highlight); border-color: color-mix(in srgb, var(--color-accent) 48%, transparent); color: var(--color-accent); }
.tag--pending { background-color: transparent; border-style: dashed; border-color: var(--color-accent); color: var(--color-accent); }
.panel--contrast .tag { background-color: transparent; border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.panel--contrast .tag--accent { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }
.status-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background-color: var(--color-primary); }
.status-dot--live { background-color: var(--color-accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 20%, transparent); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 10px 18px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); color: var(--color-ink); }
.btn--primary { background-color: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface)); color: var(--color-primary-ink); }
.btn--accent { background-color: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface)); color: var(--color-accent-ink); }
.btn--ghost { background-color: transparent; border-color: color-mix(in srgb, var(--color-primary) 45%, transparent); color: var(--color-primary); }
.btn--ghost:hover { background-color: var(--color-primary-soft); }
.btn--sm { padding: 6px 12px; font-size: var(--text-xs); }

/* ===== 筛选条 ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding: var(--space-1);
  margin-bottom: var(--space-3);
  background-color: var(--color-primary-soft);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 24%, var(--color-line));
  border-radius: var(--radius-sm);
}
.chip {
  padding: 6px 12px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}
.chip:hover { border-color: var(--color-primary); color: var(--color-primary); }
.chip[aria-pressed="true"] { background-color: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }

/* ===== 技能树式路径 ===== */
.path-map { display: grid; gap: var(--space-2); grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.path-node {
  position: relative;
  padding: var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}
.path-node--start { border-color: var(--color-primary); box-shadow: inset 0 3px 0 var(--color-primary); }
.path-node--end { border-color: var(--color-accent); box-shadow: inset 0 3px 0 var(--color-accent); }
.path-index {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-accent);
  margin-bottom: 6px;
}
.path-node--start .path-index { color: var(--color-primary); }
.path-link { margin-top: var(--space-2); font-size: var(--text-sm); color: var(--color-ink-muted); }

/* ===== 时间线 ===== */
.timeline { position: relative; padding-left: var(--space-3); border-left: var(--border-thin) solid var(--color-contrast-line); }
.timeline-item { position: relative; padding: 0 0 var(--space-4) var(--space-2); }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-mark {
  position: absolute;
  left: calc(-1 * var(--space-3) - 1px - 3px);
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background-color: var(--color-primary);
}
.timeline-item[data-state="pending"] .timeline-mark { background-color: var(--color-accent); }
.timeline-time { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.12em; color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}
.breadcrumb li { display: flex; align-items: center; gap: 6px; }
.breadcrumb li + li::before { content: "/"; color: var(--color-line); }
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

/* ===== 图片容器 ===== */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame-scrim { position: absolute; inset: 0; background-image: var(--overlay-scrim); opacity: 0; transition: opacity 160ms ease; }
.media-frame--over-text .media-frame-scrim { opacity: 1; }
.media-frame-label {
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: var(--space-2);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}
.media-row { display: grid; gap: var(--gutter); grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

/* ===== 动效协议 ===== */
.has-js .reveal { opacity: 0; transform: translateY(14px); transition: opacity 420ms ease, transform 420ms ease; }
.has-js .reveal.is-visible { opacity: 1; transform: none; }

/* ===== 跳转链接 ===== */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -80px;
  z-index: 200;
  padding: 10px 16px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  transition: top 160ms ease;
}
.skip-link:focus { top: var(--space-2); text-decoration: none; color: var(--color-contrast-ink); }

/* ===== 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: transparent;
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  transition: background-color 200ms ease, color 200ms ease, box-shadow 200ms ease;
}
.site-header.is-scrolled {
  background-image: none;
  background-color: var(--color-surface);
  color: var(--color-ink);
  border-bottom: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-1);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 68px;
  padding-top: 8px;
  padding-bottom: 8px;
}
.header-brand { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; color: inherit; text-decoration: none; }
.header-brand:hover { text-decoration: none; color: inherit; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.12; }
.brand-title { font-family: var(--font-heading); font-size: var(--text-base); font-weight: 700; letter-spacing: 0.04em; }
.brand-sub { font-size: var(--text-xs); letter-spacing: 0.16em; opacity: 0.62; }

.site-nav { display: flex; align-items: center; gap: var(--space-2); flex: 1 1 auto; min-width: 0; }
.nav-list { display: flex; align-items: center; gap: 2px; flex-wrap: nowrap; }
.nav-link {
  display: block;
  padding: 8px 10px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  color: inherit;
  font-size: var(--text-sm);
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}
.nav-link:hover { text-decoration: none; background-color: color-mix(in srgb, currentColor 14%, transparent); }
.nav-link[aria-current="page"] {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 48%, transparent);
  background-color: color-mix(in srgb, var(--color-accent) 14%, transparent);
}
.nav-quick { display: flex; align-items: center; gap: var(--space-1); margin-left: auto; }
.quick-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px dashed color-mix(in srgb, var(--color-accent) 58%, transparent);
  border-radius: var(--radius-pill);
  color: inherit;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease;
}
.quick-link::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background-color: var(--color-accent); }
.quick-link:hover { text-decoration: none; background-color: color-mix(in srgb, var(--color-accent) 16%, transparent); }

.header-tools { display: flex; align-items: center; gap: var(--space-2); flex: 0 0 auto; }
.header-meter {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}
.meter-label { opacity: 0.7; }
.meter-track {
  position: relative;
  display: block;
  width: 88px;
  height: 6px;
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, currentColor 20%, transparent);
  overflow: hidden;
}
.meter-fill { position: absolute; inset: 0 auto 0 0; width: 71%; background-color: var(--color-accent); border-radius: inherit; }
.meter-value { font-weight: 700; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: var(--border-thin) solid color-mix(in srgb, currentColor 34%, transparent);
  border-radius: var(--radius-sm);
  color: inherit;
  font-size: var(--text-sm);
}
.nav-toggle-bars { display: flex; flex-direction: column; gap: 4px; width: 16px; }
.nav-toggle-bars span { display: block; height: 2px; border-radius: 2px; background-color: currentColor; transition: transform 160ms ease, opacity 160ms ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background-color: color-mix(in srgb, var(--color-contrast-line) 70%, transparent);
}
.site-header.is-scrolled .scroll-progress { background-color: var(--color-line); }
.scroll-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 120ms linear;
}

/* ===== 页脚 ===== */
.site-footer {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding: var(--space-6) 0 var(--space-3);
}
.footer-inner { display: block; }
.footer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-brand { display: flex; align-items: center; gap: var(--space-2); }
.footer-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-accent);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  flex: 0 0 auto;
}
.footer-brand-title { margin: 0; font-family: var(--font-heading); font-size: var(--text-lg); font-weight: var(--weight-heading); color: var(--color-contrast-ink); }
.footer-brand-note { margin: 4px 0 0; font-size: var(--text-sm); color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.footer-scale {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1 1 280px;
  max-width: 440px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}
.scale-track {
  position: relative;
  flex: 1 1 auto;
  height: 12px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0 1px, transparent 1px 8.3333%);
}
.scale-fill { position: absolute; left: 0; bottom: -1px; height: 2px; width: 71%; background-color: var(--color-contrast-accent); }
.scale-value { font-weight: 700; color: var(--color-contrast-ink); }

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-col-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}
.footer-list { display: flex; flex-direction: column; gap: 8px; }
.footer-list a { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); font-size: var(--text-sm); text-decoration: none; }
.footer-list a:hover { color: var(--color-contrast-ink); text-decoration: underline; }
.footer-contact { display: flex; flex-direction: column; gap: 6px; font-size: var(--text-sm); }
.footer-contact-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
}
.footer-contact-val { font-family: var(--font-mono); color: var(--color-contrast-ink); word-break: break-word; }
.footer-contact-val + .footer-contact-key { margin-top: var(--space-1); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-3);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}
.footer-legal { margin: 0; font-family: var(--font-mono); letter-spacing: 0.06em; }
.footer-note { margin: 0; max-width: 56ch; }

/* ===== 响应式 ===== */
@media (max-width: 1320px) {
  .header-meter { display: none; }
}
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3) var(--space-3);
    background-color: var(--color-contrast-surface);
    border-top: var(--border-thin) solid var(--color-contrast-line);
    border-bottom: var(--border-thin) solid var(--color-contrast-line);
    box-shadow: var(--shadow-2);
    max-height: calc(100vh - 68px);
    overflow-y: auto;
  }
  .site-nav[data-open="true"] { display: flex; animation: navIn 160ms ease-out both; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; width: 100%; }
  .nav-link {
    padding: 13px 4px;
    font-size: var(--text-base);
    color: var(--color-contrast-ink);
    border: 0;
    border-bottom: var(--border-thin) solid var(--color-contrast-line);
    border-radius: 0;
  }
  .nav-link:hover { background-color: color-mix(in srgb, var(--color-contrast-ink) 10%, transparent); }
  .nav-link[aria-current="page"] { background-color: transparent; border-color: var(--color-contrast-line); color: var(--color-contrast-accent); box-shadow: inset 3px 0 0 var(--color-contrast-accent); }
  .nav-quick { flex-direction: row; flex-wrap: wrap; margin-left: 0; }
  .quick-link { color: var(--color-contrast-ink); }
}
@keyframes navIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}
@media (max-width: 900px) {
  .span-3, .span-4, .span-6, .span-8 { grid-column: span 12; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
  .footer-head { align-items: flex-start; }
  .footer-scale { max-width: none; width: 100%; }
}
@media (max-width: 560px) {
  .brand-sub { display: none; }
  .header-cta { padding: 8px 12px; font-size: var(--text-xs); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .panel { padding: var(--space-2); }
  .media-row { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}

/* ===== 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;
  }
  .has-js .reveal { opacity: 1; transform: none; }
  .panel:hover { transform: none; }
  .btn:hover { transform: none; }
}