:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f0f0f0;
  --color-surface-deep: #e1e2e1;
  --color-ink: #2d342d;
  --color-ink-soft: #566157;
  --color-ink-muted: #727e72;
  --color-line: #d5d6d5;
  --color-primary: #0e8612;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #d9eada;
  --color-accent: #cd09cb;
  --color-accent-ink: #ffffff;
  --color-highlight: #f2cff2;
  --color-focus: #c700c5;
  --color-contrast-surface: #142b15;
  --color-contrast-ink: #e4e7e4;
  --color-contrast-line: #425443;
  --color-contrast-accent: #f41af2;
  --overlay-scrim: linear-gradient(180deg, rgba(20, 43, 21, 0.35) 0%, rgba(20, 43, 21, 0.72) 55%, rgba(20, 43, 21, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 8.7px;
  --text-sm: 14.2px;
  --text-base: 18px;
  --text-lg: 29.1px;
  --text-xl: 47.1px;
  --text-2xl: 76.2px;
  --text-3xl: 123.4px;
  --text-4xl: 199.6px;
  --text-display: clamp(67px, 13.8vw, 176px);
  --text-figure: clamp(56px, 9.9vw, 127px);
  --weight-heading: 852;
  --weight-body: 400;
  --leading-body: 1.77;
  --leading-heading: 1.15;
  --tracking-heading: -0.023em;
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 4px;
  --radius-pill: 4px;
  --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: 1120px;
  --measure: 69ch;
  --gutter: 16px;
  --section-y: 114px;
  --section-y-lg: 160px;
}

:root {
  --rail-w: 96px;
  --bar-h: 64px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ============================================================
   reset 与基础排版
   ============================================================ */
*, *::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);
  overflow-wrap: break-word;
}

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);
}

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4, h5, h6 { font-size: var(--text-base); }

p { margin: 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; width: 100%; }
hr { border: 0; border-top: var(--border-thin) solid var(--color-line); margin: 0; }

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

.band--dark :focus-visible,
.site-nav :focus-visible,
.footer-base :focus-visible {
  outline-color: var(--color-contrast-accent);
}

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

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

.grid-11 {
  display: grid;
  grid-template-columns: repeat(11, minmax(0, 1fr));
  gap: var(--gutter);
}

.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-11 { grid-column: span 11; }

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-8); }
.section--line { border-top: var(--border-thin) solid var(--color-line); }

.band--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.band--soft { background-color: var(--color-primary-soft); }
.band--deep { background-color: var(--color-surface-deep); }

.band--dark {
  position: relative;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.band--dark::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .06;
  background-image:
    repeating-linear-gradient(90deg, var(--color-contrast-ink) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(180deg, var(--color-contrast-accent) 0 1px, transparent 1px 48px);
}
.band--dark > * { position: relative; z-index: 1; }

.band--dark .eyebrow { color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent); }
.band--dark .lede { color: var(--color-contrast-ink); }
.band--dark .note { border-left-color: var(--color-contrast-accent); color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }
.band--dark .stat,
.band--dark .stat-strip { border-color: var(--color-contrast-line); }
.band--dark .stat-value { color: var(--color-contrast-accent); }
.band--dark .stat-label { color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent); }

/* ============================================================
   文字与数据
   ============================================================ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .14em;
  color: var(--color-ink-muted);
}
.eyebrow::before {
  content: "";
  width: var(--space-4);
  height: 1px;
  background-color: var(--color-accent);
}

.lede {
  max-width: 46ch;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.4;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink-soft);
}

.figure-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: .92;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}
.num--accent { color: var(--color-accent); }

.note {
  max-width: var(--measure);
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-accent);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-4); }
.prose p { color: var(--color-ink-soft); }
.prose ul { display: flex; flex-direction: column; gap: var(--space-2); }
.prose ul li { position: relative; padding-left: var(--space-4); color: var(--color-ink-soft); }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: var(--space-2);
  height: 1px;
  background-color: var(--color-accent);
}

/* ============================================================
   按钮 / 面包屑 / 标签
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-lg);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: .02em;
  transition: background-color .16s var(--ease), color .16s var(--ease),
              border-color .16s var(--ease), transform .16s var(--ease);
}
.btn:hover { transform: translateY(-1px); }

.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) 84%, var(--color-ink));
  border-color: color-mix(in srgb, var(--color-primary) 84%, var(--color-ink));
}

.btn--line {
  background-color: transparent;
  border-color: var(--color-ink);
  color: var(--color-ink);
}
.btn--line:hover {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--dark {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.crumbs {
  padding-block: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.crumbs li + li::before {
  content: "/";
  margin-right: var(--space-2);
  color: var(--color-line);
}
.crumbs a:hover { color: var(--color-primary); }
.crumbs [aria-current="page"] { color: var(--color-ink); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .04em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.tag--soft {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 32%, transparent);
  color: color-mix(in srgb, var(--color-primary) 76%, var(--color-ink));
}
.tag--accent {
  background-color: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 42%, transparent);
  color: color-mix(in srgb, var(--color-accent) 68%, var(--color-ink));
}
.tag--dark {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

/* ============================================================
   数字条 / 编号条目 / 对照表
   ============================================================ */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}
.stat {
  padding-top: var(--space-3);
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
}
.stat:first-child {
  border-left: 0;
  padding-left: 0;
}
.stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}
.stat-label {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.entry-list { border-top: var(--border-thin) solid var(--color-line); }
.entry {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: var(--space-3) var(--space-4);
  padding: var(--space-4) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color .16s var(--ease);
}
.entry:hover { background-color: var(--color-primary-soft); }
.entry-idx {
  padding-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .08em;
  color: var(--color-accent);
}
.entry-title { font-size: var(--text-lg); }
.entry-desc {
  margin-top: var(--space-1);
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}
.data-table { min-width: 560px; }
.data-table caption {
  padding: var(--space-3);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .06em;
  color: var(--color-ink-muted);
}
.data-table th,
.data-table td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.data-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background-color: var(--color-surface-alt);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  letter-spacing: .06em;
  color: var(--color-ink-muted);
}
.data-table tbody tr:nth-child(even) { background-color: var(--color-surface-alt); }
.data-table tbody tr:hover { background-color: var(--color-primary-soft); }
.data-table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}

/* ============================================================
   图片与图形容器
   ============================================================ */
.figure-frame {
  position: relative;
  overflow: hidden;
  background-color: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
}
.figure-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure-frame--wide { aspect-ratio: 16 / 9; }
.figure-frame--panorama { aspect-ratio: 21 / 9; }
.figure-frame--tall { aspect-ratio: 4 / 5; }
.figure-frame--square { aspect-ratio: 1 / 1; }

.figure-scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}
.figure-cap {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .04em;
  color: var(--color-contrast-ink);
}

.visual {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-alt);
}
.visual--grid {
  background-image:
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--color-primary) 20%, transparent) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(180deg, color-mix(in srgb, var(--color-accent) 14%, transparent) 0 1px, transparent 1px 24px);
}

/* ============================================================
   下一步条 / 返回顶部 / 显现
   ============================================================ */
.next-bar {
  position: sticky;
  bottom: 0;
  z-index: 50;
  border-top: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface);
}
.next-bar-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--space-3);
}
.next-bar-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  border-bottom: 1px solid transparent;
}
.next-bar-link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.next-bar-hint {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .18em;
  color: var(--color-ink-muted);
}

.top-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  border-bottom: 1px solid transparent;
}
.top-link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
}
.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ============================================================
   头部
   ============================================================ */
.skip-link {
  position: fixed;
  z-index: 200;
  top: var(--space-2);
  left: var(--space-2);
  padding: var(--space-2) var(--space-3);
  transform: translateY(-300%);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: relative;
  z-index: 60;
}

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

.hdr-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container);
  min-height: var(--bar-h);
  margin-inline: auto;
  padding: var(--space-2) var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 0 0 auto;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .04em;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}
.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
}
.brand-line {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.layer-switch {
  display: none;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
}
.layer-switch li {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.layer-switch li:hover { border-bottom-color: var(--color-primary); }
.layer-idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  color: var(--color-accent);
}

.hdr-utility {
  display: none;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
  padding: calc(var(--space-1) + 2px) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .06em;
  transition: border-color .16s var(--ease), background-color .16s var(--ease);
}
.nav-toggle:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
}
.nav-toggle-bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 11px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background-color: currentColor;
  transition: transform .16s var(--ease);
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

/* ============================================================
   导航：移动端抽屉
   ============================================================ */
.site-nav {
  position: fixed;
  z-index: 80;
  top: 0;
  bottom: 0;
  left: 0;
  width: min(86vw, 340px);
  padding: calc(var(--bar-h) + var(--space-4)) var(--space-3) var(--space-6);
  overflow-y: auto;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  transform: translateX(-100%);
  transition: transform .18s var(--ease);
}
.site-nav::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .07;
  background-image:
    repeating-linear-gradient(180deg, var(--color-contrast-ink) 0 1px, transparent 1px 14px),
    repeating-linear-gradient(90deg, var(--color-contrast-accent) 0 1px, transparent 1px 96px);
}
.site-nav[data-open="true"] { transform: translateX(0); }

.nav-list {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.nav-tick {
  flex: 0 0 auto;
  width: 16px;
  height: 1px;
  background-color: var(--color-contrast-line);
  transition: width .16s var(--ease), background-color .16s var(--ease);
}
.nav-idx {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.nav-label {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
}
.nav-link:hover .nav-label { transform: translateX(1px); }
.nav-link:hover .nav-tick { background-color: var(--color-contrast-ink); }

.nav-link[aria-current="page"] .nav-idx,
.nav-link[aria-current="page"] .nav-label { color: var(--color-contrast-accent); }
.nav-link[aria-current="page"] .nav-tick {
  width: 26px;
  background-color: var(--color-contrast-accent);
}
.nav-link.is-section .nav-tick {
  width: 26px;
  background-color: var(--color-contrast-ink);
}

.rail-progress { display: none; }
.rail-mark { display: none; }

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 70;
  display: none;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 58%, transparent);
}
.nav-scrim.is-open { display: block; }

body.nav-open { overflow: hidden; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-surface);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-inner {
  display: grid;
  gap: var(--space-6);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-8) var(--space-3) 0;
}
.footer-brand {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
}
.footer-line {
  margin-top: var(--space-1);
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.footer-index {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6) var(--space-8);
}
.footer-col { min-width: 200px; }
.footer-col-title {
  padding-bottom: var(--space-1);
  margin-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-weight: var(--weight-body);
  font-size: var(--text-sm);
  letter-spacing: .1em;
  color: var(--color-ink-muted);
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.footer-links a {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  padding-block: 2px;
  border-bottom: 1px solid transparent;
  font-size: var(--text-base);
  color: var(--color-ink);
}
.footer-idx {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .06em;
  color: var(--color-accent);
}
.footer-links a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.footer-links a:hover .footer-idx { color: var(--color-primary); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-legal a {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: 1px solid transparent;
}
.footer-legal a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.footer-contact {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  letter-spacing: .01em;
}

.footer-base {
  margin-top: var(--space-8);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.footer-base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .02em;
}

/* ============================================================
   断点
   ============================================================ */
@media (min-width: 768px) {
  .layer-switch { display: flex; }
  .hdr-inner { gap: var(--space-4); }
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }

  .skip-link { left: calc(var(--rail-w) + var(--space-2)); }

  .nav-toggle { display: none; }
  .nav-scrim { display: none !important; }
  body.nav-open { overflow: auto; }

  .site-nav {
    width: var(--rail-w);
    padding: var(--space-6) 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: visible;
    transform: none;
  }
  .nav-list { gap: 2px; }

  .nav-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: var(--space-2);
    border-bottom: 0;
    border-left: 1px solid transparent;
    transition: transform .16s var(--ease), border-color .16s var(--ease);
  }
  .nav-link:hover {
    transform: translateX(1px);
    border-left-color: var(--color-contrast-line);
  }
  .nav-label { font-size: var(--text-sm); }
  .nav-idx { font-size: var(--text-xs); }
  .nav-tick { width: 14px; }
  .nav-link[aria-current="page"] { border-left-color: var(--color-contrast-accent); }

  .rail-progress {
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 2px;
    height: 0;
    background-color: var(--color-contrast-accent);
    transition: height .12s linear;
  }
  .rail-mark {
    display: block;
    position: absolute;
    bottom: var(--space-3);
    left: 0;
    width: 100%;
    text-align: center;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: .18em;
    color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
  }
}

@media (min-width: 1200px) {
  .hdr-utility { display: block; margin-left: var(--space-3); }
}

@media (max-width: 767px) {
  .grid-11 { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
  .span-4, .span-5, .span-6, .span-7, .span-11 { grid-column: 1 / -1; }
  .entry { grid-template-columns: auto minmax(0, 1fr); }
  .entry .tag { grid-column: 2; justify-self: start; }
  .stat { border-left: 0; padding-left: 0; }
  .footer-index { gap: var(--space-6); }
  .footer-col { min-width: 100%; }
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
  }
  .btn:hover,
  .nav-link:hover,
  .nav-link:hover .nav-label { transform: none; }
  .js [data-reveal] { opacity: 1; transform: none; }
}