:root {
  --color-surface: #2f2d31;
  --color-surface-alt: #3e3b40;
  --color-surface-deep: #504d52;
  --color-ink: #d2ccd6;
  --color-ink-soft: #a298aa;
  --color-ink-muted: #84778d;
  --color-line: #4c4a4f;
  --color-primary: #a45ed4;
  --color-primary-ink: #151118;
  --color-primary-soft: #3f3448;
  --color-accent: #6af807;
  --color-accent-ink: #151118;
  --color-highlight: #3a5229;
  --color-focus: #69ff00;
  --color-contrast-surface: #f3f2f3;
  --color-contrast-ink: #363338;
  --color-contrast-line: #c9c8ca;
  --color-contrast-accent: #357c03;
  --overlay-scrim: linear-gradient(180deg, rgba(243, 242, 243, 0.35) 0%, rgba(243, 242, 243, 0.72) 55%, rgba(243, 242, 243, 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: 12.2px;
  --text-sm: 15.2px;
  --text-base: 17px;
  --text-lg: 21.2px;
  --text-xl: 26.6px;
  --text-2xl: 33.2px;
  --text-3xl: 41.5px;
  --text-4xl: 51.9px;
  --text-display: clamp(50px, 10.3vw, 132px);
  --text-figure: clamp(42px, 7.4vw, 95px);
  --weight-heading: 714;
  --weight-body: 400;
  --leading-body: 1.73;
  --leading-heading: 1.19;
  --tracking-heading: 0.003em;
  --radius-sm: 10px;
  --radius-md: 12px;
  --radius-lg: 13px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 0 0 1px rgba(106, 248, 7, 0.35);
  --shadow-2: 0 0 28px rgba(106, 248, 7, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1280px;
  --measure: 67ch;
  --gutter: 32px;
  --section-y: 101px;
  --section-y-lg: 141px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 160px;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--color-surface);
  background-image:
    radial-gradient(96% 52% at 50% -14%,
      color-mix(in srgb, var(--color-primary) 16%, transparent) 0%,
      transparent 64%),
    radial-gradient(70% 40% at 88% 4%,
      color-mix(in srgb, var(--color-accent) 5%, transparent) 0%,
      transparent 70%);
  background-repeat: no-repeat;
  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;
  -moz-osx-font-smoothing: grayscale;
}

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

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

[hidden] { display: none !important; }

a {
  color: var(--color-ink);
  text-decoration: none;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 70%, transparent);
  text-underline-offset: 3px;
  transition: color 160ms linear, text-decoration-color 160ms linear;
}
a:hover {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

h1, h2, h3, h4 {
  margin: 0 0 var(--space-2);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  text-wrap: balance;
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p { margin: 0 0 var(--space-2); }

hr { border: 0; }

button { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection {
  background: color-mix(in srgb, var(--color-primary) 60%, transparent);
  color: var(--color-ink);
}

/* =========================================================
   2. 布局工具
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

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

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

.lead {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.55;
  color: var(--color-ink);
}

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

.grid {
  display: grid;
  gap: var(--gutter);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.layout-split {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(0, 3fr);
  gap: var(--space-6);
  align-items: start;
}

.rail {
  position: sticky;
  top: 152px;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.rail__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.rail__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-left: var(--border-thick) solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  text-decoration: none;
}
.rail__link:hover {
  background: var(--color-surface-alt);
  border-left-color: var(--color-primary);
  color: var(--color-ink);
}

/* =========================================================
   3. 文字工具
   ========================================================= */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: var(--border-thin);
  background: var(--color-primary);
}

.mark {
  background-image: linear-gradient(transparent 62%,
    color-mix(in srgb, var(--color-primary) 62%, transparent) 62%);
  background-repeat: no-repeat;
  padding-inline: 2px;
}
.mark--accent {
  background-image: linear-gradient(transparent 62%,
    color-mix(in srgb, var(--color-accent) 42%, transparent) 62%);
}

.figure-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-2) var(--space-6);
}

.figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.94;
  letter-spacing: -0.035em;
  color: var(--color-ink);
}
.figure--accent { color: var(--color-accent); }

.figure__unit {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.stat-bar::after {
  content: "";
  display: block;
  width: 46px;
  height: 3px;
  margin-top: 10px;
  border-radius: 2px;
  background: var(--color-highlight);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}
.tag--accent {
  background: var(--color-highlight);
  color: var(--color-accent);
}

/* =========================================================
   4. 面包屑
   ========================================================= */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}
.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumbs li + li::before {
  content: "/";
  color: var(--color-line);
}
.breadcrumbs a {
  color: var(--color-ink-soft);
  text-decoration: none;
}
.breadcrumbs [aria-current="page"] { color: var(--color-accent); }

/* =========================================================
   5. 按钮
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background 160ms linear, color 160ms linear,
    border-color 160ms linear, box-shadow 160ms linear;
}
.btn:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-1);
  text-decoration: none;
}
.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-weight: 600;
}
.btn--primary:hover {
  background: color-mix(in srgb, var(--color-primary) 86%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}
.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-weight: 600;
}
.btn--accent:hover {
  background: color-mix(in srgb, var(--color-accent) 88%, var(--color-contrast-surface));
  color: var(--color-accent-ink);
}
.btn--ghost { color: var(--color-ink-soft); }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* =========================================================
   6. 面板 · 反白区块
   ========================================================= */
.panel {
  position: relative;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-image: linear-gradient(180deg,
    color-mix(in srgb, var(--color-primary) 8%, var(--color-surface-alt)) 0%,
    var(--color-surface-alt) 100%);
  box-shadow: var(--shadow-1);
  transition: box-shadow 200ms linear, border-color 200ms linear;
}
.panel:hover {
  border-color: color-mix(in srgb, var(--color-accent) 46%, transparent);
  box-shadow: var(--shadow-2);
}
.panel--quiet {
  background-image: none;
  background-color: var(--color-surface-alt);
  box-shadow: none;
}
.panel--deep {
  background-image: none;
  background-color: var(--color-surface-deep);
}
.panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) dotted var(--color-line);
}
.panel__title {
  margin: 0;
  font-size: var(--text-lg);
}

.band-contrast {
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.band-contrast h1,
.band-contrast h2,
.band-contrast h3,
.band-contrast h4 { color: var(--color-contrast-ink); }
.band-contrast p { color: var(--color-contrast-ink); }
.band-contrast a {
  color: var(--color-contrast-ink);
  text-decoration-color: var(--color-contrast-accent);
}
.band-contrast a:hover { color: var(--color-contrast-accent); }
.band-contrast .eyebrow { color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent); }
.band-contrast .eyebrow::before { background: var(--color-contrast-accent); }
.band-contrast .rule { border-top-color: var(--color-contrast-line); }
.band-contrast .figure { color: var(--color-contrast-accent); }
.band-contrast .figure__unit { color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent); }
.band-contrast .panel {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 4%, var(--color-contrast-surface));
  background-image: none;
  border-color: var(--color-contrast-line);
  box-shadow: none;
}
.band-contrast .data-table th {
  background: color-mix(in srgb, var(--color-contrast-ink) 8%, var(--color-contrast-surface));
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-line);
}
.band-contrast .data-table td {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  border-bottom-color: var(--color-contrast-line);
}

/* =========================================================
   7. 筛选条
   ========================================================= */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px;
  border: var(--border-thin) dashed var(--color-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface-alt) 55%, transparent);
}
.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 15px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: color 160ms linear, background 160ms linear,
    border-color 160ms linear, box-shadow 160ms linear;
}
.filter-chip:hover {
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-primary) 60%, transparent);
}
.filter-chip[aria-pressed="true"] {
  background: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
  color: var(--color-accent);
  box-shadow: var(--shadow-1);
}
.filter-chip__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  opacity: 0.8;
}
.filter-empty {
  display: none;
  padding: var(--space-4);
  border: var(--border-thin) dashed var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  text-align: center;
}
.filter-empty[data-visible] { display: block; }

/* =========================================================
   8. 折叠问答
   ========================================================= */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.accordion__item {
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  transition: border-color 180ms linear, box-shadow 180ms linear;
}
.accordion__item[data-open] {
  border-color: color-mix(in srgb, var(--color-accent) 46%, transparent);
  box-shadow: var(--shadow-1);
}
.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  padding: 14px 18px;
  border: 0;
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
}
.accordion__trigger:hover { color: var(--color-accent); }
.accordion__mark {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-right: var(--border-thin) solid var(--color-ink-muted);
  border-bottom: var(--border-thin) solid var(--color-ink-muted);
  transform: rotate(45deg);
  transition: transform 180ms linear, border-color 180ms linear;
}
.accordion__item[data-open] .accordion__mark {
  transform: rotate(-135deg);
  border-color: var(--color-accent);
}
.accordion__panel {
  display: none;
  padding: 0 18px 18px;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}
.accordion__item[data-open] .accordion__panel { display: block; }

/* =========================================================
   9. 表格
   ========================================================= */
.table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface-alt) 70%, transparent);
}
.data-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.data-table th {
  padding: 12px 16px;
  background: var(--color-primary-soft);
  border-bottom: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
}
.data-table td {
  padding: 12px 16px;
  border-bottom: var(--border-thin) dotted var(--color-line);
  color: var(--color-ink-soft);
  vertical-align: top;
}
.data-table tbody tr:hover {
  background: color-mix(in srgb, var(--color-primary) 9%, transparent);
}
.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table strong { color: var(--color-ink); }
.data-table td[data-emphasis] {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* =========================================================
   10. 图片容器
   ========================================================= */
.media-frame {
  position: relative;
  display: block;
  padding: 10px;
  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 {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: var(--border-thin) solid var(--color-line);
  border-radius: calc(var(--radius-md) - 4px);
  background: var(--color-surface-deep);
}
.media-frame--wide .media-frame__img { aspect-ratio: 16 / 9; }
.media-frame--tall .media-frame__img { aspect-ratio: 3 / 4; }
.media-frame__overlay {
  position: absolute;
  inset: 10px;
  display: flex;
  align-items: flex-end;
  padding: var(--space-3);
  border-radius: calc(var(--radius-md) - 4px);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
}
.media-frame__cap {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: var(--border-thin) dotted var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}

/* =========================================================
   11. 正文排版
   ========================================================= */
.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}
.prose p { margin: 0 0 var(--space-3); }
.prose > :last-child { margin-bottom: 0; }
.prose ul,
.prose ol {
  margin: 0 0 var(--space-3);
  padding-left: 1.3em;
  list-style: disc;
}
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 6px; }
.prose strong { color: var(--color-ink); }
.prose h2,
.prose h3 { margin-top: var(--space-4); }

/* =========================================================
   12. 页头
   ========================================================= */
.skip-link {
  position: fixed;
  top: -120px;
  left: var(--space-2);
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top 180ms linear;
}
.skip-link:focus {
  top: var(--space-2);
  color: var(--color-accent-ink);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  border-bottom: var(--border-thin) dashed var(--color-line);
  background: color-mix(in srgb, var(--color-surface) 90%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--gutter) var(--space-1);
}

.masthead__rail {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  white-space: nowrap;
  transition: opacity 200ms linear, visibility 200ms linear;
}
.masthead__rail-key {
  color: var(--color-primary);
  border-bottom: var(--border-thin) dashed color-mix(in srgb, var(--color-primary) 60%, transparent);
}
.masthead__rail .mono { color: var(--color-accent); }
.masthead__rail-dim {
  padding-left: 8px;
  border-left: var(--border-thin) dotted var(--color-line);
  color: var(--color-ink-muted);
}

.masthead__brand {
  position: relative;
  justify-self: center;
  padding-bottom: 5px;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: clamp(var(--text-xl), 3.4vw, var(--text-2xl));
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: font-size 200ms linear, color 160ms linear;
}
.masthead__brand::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 26px;
  height: var(--border-thick);
  border-radius: 2px;
  background: var(--color-accent);
  transform: translateX(-50%);
  transition: width 200ms linear;
}
.masthead__brand:hover { color: var(--color-ink); }
.masthead__brand:hover::after { width: 100%; }

.nav-toggle {
  display: none;
  justify-self: end;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: border-color 160ms linear, box-shadow 160ms linear;
}
.nav-toggle:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-1);
}
.nav-toggle__mark {
  position: relative;
  display: inline-block;
  width: 14px;
  height: 8px;
}
.nav-toggle__mark::before,
.nav-toggle__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: var(--border-thin);
  background: currentColor;
}
.nav-toggle__mark::before { top: 0; }
.nav-toggle__mark::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.site-nav {
  border-top: var(--border-thin) dotted var(--color-line);
  background: color-mix(in srgb, var(--color-surface-alt) 38%, transparent);
}
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-1) var(--gutter) 14px;
}
.site-nav__link {
  position: relative;
  display: block;
  padding: 7px 16px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color 160ms linear, background 160ms linear, border-color 160ms linear;
}
.site-nav__link:hover {
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-primary) 60%, transparent);
}
.site-nav__link[aria-current="page"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-weight: 600;
}
.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -6px;
  width: 18px;
  height: var(--border-thick);
  border-radius: 2px;
  background: var(--color-accent);
  transform: translateX(-50%);
}

.site-header[data-compact] .masthead { padding-block: var(--space-1); }
.site-header[data-compact] .masthead__brand { font-size: var(--text-lg); }
.site-header[data-compact] .masthead__brand::after { width: 16px; }
.site-header[data-compact] .masthead__rail {
  opacity: 0;
  visibility: hidden;
}

/* =========================================================
   13. 页脚
   ========================================================= */
.site-footer {
  margin-top: var(--section-y);
  padding-block: var(--space-6) var(--space-4);
  border-top: var(--border-thin) dashed var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-6);
}

.footer__col { min-width: 0; }

.footer__brand {
  margin: 0 0 var(--space-1);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}
.footer__addr {
  max-width: 34ch;
  margin: 0 0 6px;
  color: var(--color-ink-muted);
}
.footer__domain {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}

.footer__label {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0 0 var(--space-3);
}
.footer__contact li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}
.footer__tag {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.copy-btn {
  padding: 2px 0;
  border: 0;
  border-bottom: var(--border-thin) dashed var(--color-line);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: -0.01em;
  text-align: left;
  word-break: break-all;
  cursor: pointer;
  transition: color 160ms linear, border-color 160ms linear;
}
.copy-btn:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.copy-btn[data-copied] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
}
.footer__links a {
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}

.footer__status {
  min-height: 1.5em;
  margin: var(--space-2) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-accent);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-1);
  margin-top: var(--space-4);
  padding-top: var(--space-2);
  border-top: var(--border-thin) dotted var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}
.footer__bottom p { margin: 0; }

/* =========================================================
   14. 滚动进度
   ========================================================= */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  box-shadow: 0 0 12px color-mix(in srgb, var(--color-accent) 65%, transparent);
  pointer-events: none;
}

/* =========================================================
   15. 响应式
   ========================================================= */
@media (max-width: 1080px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  .layout-split { grid-template-columns: minmax(0, 1fr); }
  .rail { position: static; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .masthead__rail { display: none; }

  .site-nav { display: none; }
  .site-nav[data-open] { display: block; }
  .site-nav__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    padding: var(--space-2) var(--gutter) var(--space-3);
  }
  .site-nav__link {
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border-color: color-mix(in srgb, var(--color-line) 100%, transparent);
    font-size: var(--text-base);
  }
  .site-nav__link[aria-current="page"]::after { display: none; }
}

@media (max-width: 720px) {
  :root { --section-y: 72px; --section-y-lg: 92px; }

  .container { padding-inline: var(--space-3); }
  .grid,
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .footer__grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .footer__bottom { flex-direction: column; }

  .band-contrast {
    padding: var(--space-4) var(--space-3);
    border-radius: var(--radius-md);
  }

  .masthead { padding-inline: var(--space-3); }
  .site-nav__list { padding-inline: var(--space-3); }
}

@media (max-width: 420px) {
  .footer__contact li { flex-direction: column; align-items: flex-start; gap: 2px; }
}

/* =========================================================
   16. 动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}