:root {
  --color-surface: #fbfafa;
  --color-surface-alt: #f2f1f1;
  --color-surface-deep: #e6e5e3;
  --color-ink: #4b493e;
  --color-ink-soft: #726e60;
  --color-ink-muted: #898576;
  --color-line: #dbdad8;
  --color-primary: #80744c;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #eae7e2;
  --color-accent: #bb593f;
  --color-accent-ink: #ffffff;
  --color-highlight: #efddd8;
  --color-focus: #bf4e31;
  --color-contrast-surface: #161511;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #44433f;
  --color-contrast-accent: #c2654c;
  --overlay-scrim: linear-gradient(180deg, rgba(22, 21, 17, 0.35) 0%, rgba(22, 21, 17, 0.72) 55%, rgba(22, 21, 17, 0.92) 100%);
  --font-heading: "Hiragino Sans GB", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Hiragino Sans GB", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.4px;
  --text-sm: 14.3px;
  --text-base: 16px;
  --text-lg: 20.0px;
  --text-xl: 25.0px;
  --text-2xl: 31.2px;
  --text-3xl: 39.1px;
  --text-4xl: 48.8px;
  --text-display: clamp(35px, 7.3vw, 93px);
  --text-figure: clamp(29px, 5.2vw, 67px);
  --weight-heading: 674;
  --weight-body: 400;
  --leading-body: 1.79;
  --leading-heading: 1.21;
  --tracking-heading: 0.007em;
  --radius-sm: 18px;
  --radius-md: 20px;
  --radius-lg: 23px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(75, 73, 62, 0.08);
  --shadow-2: 0 18px 44px rgba(75, 73, 62, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 74ch;
  --gutter: 16px;
  --section-y: 81px;
  --section-y-lg: 113px;
}

/* =========================================================
   1. Reset 与基础中文排版
   ========================================================= */
*, *::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);
}
img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
p { margin: 0 0 var(--space-2); }
ul, ol { margin: 0 0 var(--space-3); padding-inline-start: 1.15em; }
li { margin-block: 4px; }
a {
  color: color-mix(in srgb, var(--color-primary) 76%, var(--color-ink));
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}
a:hover { color: var(--color-accent); }
strong { font-weight: 600; }
::selection { background-color: var(--color-highlight); color: var(--color-ink); }
:focus-visible {
  outline: calc(var(--border-thick) * 3) solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 6px;
}
h1, h2, h3, h4, h5 {
  margin: 0 0 var(--space-2);
  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: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
#main-content { display: block; }

/* =========================================================
   2. 布局：容器、栅格、分区、分节线、卡纸
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}
.grid { display: grid; gap: var(--space-3); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-12 { grid-column: span 12; }

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

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

.slab {
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-1);
}
.slab--deep { background-color: var(--color-surface-deep); }
.slab--soft { background-color: var(--color-primary-soft); }
.slab--highlight { background-color: var(--color-highlight); }
.slab--contrast { background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }

.rule {
  border: 0;
  border-top: calc(var(--border-thick) * 2) solid var(--color-line);
  margin: 0;
}
.rule-double {
  border: 0;
  border-top: calc(var(--border-thick) * 2) solid var(--color-line);
  border-bottom: calc(var(--border-thick) * 2) solid var(--color-line);
  height: var(--space-1);
  background-color: transparent;
  margin: 0;
}
.rule--contrast { border-top-color: var(--color-contrast-line); }

/* =========================================================
   3. 排版组件
   ========================================================= */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}
.display-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.05;
  letter-spacing: var(--tracking-heading);
}
.figure-value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
}
.lead { max-width: var(--measure); font-size: var(--text-lg); color: var(--color-ink-soft); }
.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-3); }
.prose p { margin: 0; }
.prose h2 { margin-top: var(--space-6); font-size: var(--text-xl); }
.prose h3 { margin-top: var(--space-4); font-size: var(--text-lg); }
.prose li { margin-block: 6px; }

.section-head {
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  margin-bottom: var(--space-4);
}
.section-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--color-primary);
  transition: color 200ms ease-out;
}
.section-title { margin: 0 0 var(--space-1); font-size: var(--text-2xl); }
.section-sub { margin: 0; max-width: var(--measure); color: var(--color-ink-soft); }
.section[data-active="true"] .section-num { color: var(--color-accent); }

.breadcrumb { margin: 0 0 var(--space-4); font-size: var(--text-sm); color: var(--color-ink-muted); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: var(--space-1); list-style: none; margin: 0; padding: 0; }
.breadcrumb li { display: flex; align-items: center; gap: var(--space-1); margin: 0; }
.breadcrumb li + li::before { content: "/"; color: color-mix(in srgb, var(--color-ink-muted) 70%, transparent); }
.breadcrumb a { color: var(--color-ink-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

/* =========================================================
   4. 按钮与小组件
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: 48px;
  padding: 0 var(--space-3);
  border: calc(var(--border-thick) * 2) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 200ms ease-out, color 200ms ease-out,
              border-color 200ms ease-out, transform 200ms ease-out;
}
.btn-primary { background-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));
  color: var(--color-primary-ink);
  transform: translateY(-2px);
}
.btn-accent { background-color: var(--color-accent); color: var(--color-accent-ink); }
.btn-accent:hover {
  background-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-ink));
  color: var(--color-accent-ink);
  transform: translateY(-2px);
}
.btn-ghost { background-color: transparent; color: var(--color-ink); border-color: var(--color-line); }
.btn-ghost:hover { background-color: var(--color-primary-soft); transform: translateY(-2px); }

.card {
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  box-shadow: var(--shadow-1);
  transition: transform 200ms ease-out, background-color 200ms ease-out, box-shadow 200ms ease-out;
}
.card:hover, .card:focus-within {
  background-color: var(--color-primary-soft);
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  line-height: 1.6;
}
.tag--primary { background-color: var(--color-primary-soft); color: var(--color-primary); }
.tag--accent { background-color: var(--color-highlight); color: var(--color-accent); }

.status { display: inline-flex; align-items: center; gap: var(--space-1); font-size: var(--text-xs); color: var(--color-ink-muted); }
.status-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
}
.status-dot--ok { background-color: var(--color-primary); }
.status-dot--muted { background-color: var(--color-ink-muted); }

.entry-list { list-style: none; margin: 0; padding: 0; }
.entry-list > li { margin: 0; }
.entry {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-2);
  border-top: calc(var(--border-thick) * 2) solid var(--color-line);
  border-radius: var(--radius-sm);
  transition: background-color 200ms ease-out;
}
.entry:hover, .entry:focus-within { background-color: var(--color-primary-soft); }
.entry-num { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-muted); }
.entry-title { margin: 0; font-size: var(--text-lg); font-weight: var(--weight-heading); }
.entry-meta { margin: 0; font-size: var(--text-sm); color: var(--color-ink-soft); }

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 4px 12px;
  border: var(--border-thin) dashed var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: background-color 180ms ease-out, border-color 180ms ease-out, color 180ms ease-out;
}
.copy-btn:hover { background-color: var(--color-primary-soft); border-color: var(--color-primary); color: var(--color-ink); }
.copy-btn[data-copied="true"] {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.copy-btn-num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.copy-btn-hint { opacity: 0.8; }
.copy-toast {
  position: fixed;
  left: 50%;
  bottom: var(--space-4);
  z-index: 80;
  margin: 0;
  padding: 8px var(--space-3);
  max-width: calc(100% - var(--space-4));
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-2);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(8px);
  transition: opacity 180ms ease-out, transform 180ms ease-out;
}
.copy-toast[data-visible="true"] { opacity: 1; transform: translateX(-50%) translateY(0); }

/* =========================================================
   5. 图片容器（页面阶段放置占位与素材）
   ========================================================= */
.figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}
.figure img { width: 100%; height: 100%; object-fit: cover; }
.figure--wide { aspect-ratio: 16 / 7; }
.figure--tall { aspect-ratio: 3 / 4; }
.figure--square { aspect-ratio: 1 / 1; }
.figure--placeholder {
  background-color: var(--color-surface-deep);
  background-image:
    repeating-radial-gradient(circle at 28% 118%, transparent 0 18px, color-mix(in srgb, var(--color-primary) 14%, transparent) 18px 19px),
    repeating-radial-gradient(circle at 88% -18%, transparent 0 26px, color-mix(in srgb, var(--color-primary) 11%, transparent) 26px 27px);
}
.figure-caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
}

/* =========================================================
   6. 头部
   ========================================================= */
.skip-link {
  position: absolute;
  top: -120px;
  left: var(--space-2);
  z-index: 90;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top 160ms ease-out;
}
.skip-link:focus { top: var(--space-2); color: var(--color-contrast-ink); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--color-surface);
  border-bottom: calc(var(--border-thick) * 2) solid var(--color-line);
}
.site-header[data-scrolled="true"] { box-shadow: var(--shadow-1); }

.header-index-strip {
  background-color: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.header-index-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-1);
}
.index-status { display: flex; align-items: center; gap: var(--space-1); margin: 0; }
.index-lang { margin: 0; }

.header-main {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding-block: var(--space-2);
}

.brand { display: inline-flex; align-items: center; gap: var(--space-2); text-decoration: none; color: var(--color-ink); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  transition: background-color 200ms ease-out;
}
.brand:hover .brand-mark { background-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-ink)); }
.brand-text { display: flex; flex-direction: column; }
.brand-name { font-family: var(--font-heading); font-size: var(--text-lg); font-weight: var(--weight-heading); line-height: 1.25; }
.brand-line { font-size: var(--text-xs); color: var(--color-ink-muted); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 0 var(--space-2);
  border: calc(var(--border-thick) * 2) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color 180ms ease-out, border-color 180ms ease-out;
}
.nav-toggle:hover { background-color: var(--color-primary-soft); }
.nav-toggle-bars {
  width: 16px;
  height: 10px;
  background-image:
    linear-gradient(var(--color-ink), var(--color-ink)),
    linear-gradient(var(--color-ink), var(--color-ink)),
    linear-gradient(var(--color-ink), var(--color-ink));
  background-size: 100% 2px;
  background-position: 0 0, 0 4px, 0 8px;
  background-repeat: no-repeat;
}
.nav-toggle-label { line-height: 1; }

.site-nav { display: flex; align-items: center; gap: var(--space-2); margin-inline-start: auto; }
.nav-list { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-list li { margin: 0; }
.nav-list a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: background-color 180ms ease-out, color 180ms ease-out;
}
.nav-list a:hover { background-color: var(--color-primary-soft); color: var(--color-ink); }
.nav-list a[aria-current="page"] { background-color: var(--color-primary); color: var(--color-primary-ink); }

.quick-jumps { display: flex; align-items: center; gap: var(--space-1); }
.jump-link {
  display: inline-block;
  padding: 8px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  color: var(--color-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: background-color 180ms ease-out, border-color 180ms ease-out, color 180ms ease-out;
}
.jump-link:hover { background-color: var(--color-primary-soft); border-color: var(--color-primary); color: var(--color-ink); }
.jump-link--accent { border-color: color-mix(in srgb, var(--color-accent) 48%, var(--color-line)); color: var(--color-accent); font-weight: 600; }
.jump-link--accent:hover { background-color: var(--color-highlight); border-color: var(--color-accent); color: var(--color-accent); }

.scroll-progress { height: 3px; background-color: var(--color-surface-deep); }
.scroll-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background-color: var(--color-accent);
  transition: width 120ms linear;
}

/* =========================================================
   7. 页脚（阶梯式）
   ========================================================= */
.site-footer { margin-top: var(--section-y-lg); }
.footer-index {
  background-color: var(--color-surface-alt);
  border-top: calc(var(--border-thick) * 2) solid var(--color-line);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding-block: var(--section-y) var(--space-6);
}
.footer-index-inner {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 5fr) minmax(0, 4fr);
  gap: var(--space-6);
  align-items: start;
}
.footer-brand-name { margin: 0 0 var(--space-1); font-family: var(--font-heading); font-size: var(--text-xl); font-weight: var(--weight-heading); }
.footer-brand-line { margin: 0; color: var(--color-ink-soft); font-size: var(--text-sm); }

.footer-nav-title { margin: 0 0 var(--space-2); font-size: var(--text-sm); font-weight: 600; letter-spacing: 0.08em; color: var(--color-ink-muted); }
.footer-nav-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-1) var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-nav-list li { margin: 0; }
.footer-nav-list a {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 10px var(--space-2);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: background-color 200ms ease-out, transform 200ms ease-out;
}
.footer-nav-list a:hover { background-color: var(--color-primary-soft); color: var(--color-ink); transform: translateY(-2px); }
.footer-num { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-muted); }
.footer-nav-label { line-height: 1.4; }

.footer-entry {
  background-color: var(--color-highlight);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  box-shadow: var(--shadow-1);
}
.footer-entry-title { margin: 0 0 var(--space-1); font-family: var(--font-heading); font-size: var(--text-lg); font-weight: var(--weight-heading); }
.footer-entry-note { margin: 0 0 var(--space-3); color: var(--color-ink-soft); font-size: var(--text-sm); }
.footer-entry-btn { width: 100%; }

.footer-legal { background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.footer-legal-inner { display: grid; gap: var(--space-2); padding-block: var(--space-6) var(--space-8); }
.legal-links { display: flex; flex-wrap: wrap; gap: var(--space-3); list-style: none; margin: 0; padding: 0; }
.legal-links li { margin: 0; }
.legal-links a {
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  transition: color 180ms ease-out, border-color 180ms ease-out;
}
.legal-links a:hover { color: var(--color-contrast-accent); border-bottom-color: var(--color-contrast-accent); }
.legal-meta,
.legal-contact,
.legal-copy { margin: 0; font-size: var(--text-sm); color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent); }
.legal-icp { font-family: var(--font-mono); }
.legal-copy { font-size: var(--text-xs); color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }

/* =========================================================
   8. 响应式
   ========================================================= */
@media (max-width: 1024px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-2, .col-3 { grid-column: span 2; }
  .col-4, .col-5, .col-6 { grid-column: span 3; }
  .col-7, .col-8, .col-9, .col-10, .col-12 { grid-column: span 6; }
  .footer-index-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
}

@media (max-width: 920px) {
  .nav-toggle { display: inline-flex; margin-inline-start: auto; }
  .site-nav {
    position: absolute;
    top: calc(100% + var(--space-1));
    left: 0;
    right: 0;
    z-index: 55;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    margin: 0;
    padding: var(--space-2);
    background-color: var(--color-surface);
    border: calc(var(--border-thick) * 2) solid var(--color-line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open="true"] { display: flex; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-list a { padding: 12px var(--space-2); border-radius: var(--radius-sm); font-size: var(--text-base); }
  .quick-jumps {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    padding-top: var(--space-2);
    border-top: var(--border-thin) solid var(--color-line);
  }
  .jump-link { text-align: center; padding: 12px; }
}

@media (max-width: 720px) {
  .index-lang { display: none; }
  .brand-line { display: none; }
}

@media (max-width: 640px) {
  .container { padding-inline: var(--space-2); }
  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .col-2, .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9, .col-10, .col-12 { grid-column: span 1; }
  .section-head { grid-template-columns: minmax(0, 1fr); gap: var(--space-1); }
  .slab { padding: var(--space-3); }
  .footer-index-inner { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .footer-nav-list { grid-template-columns: minmax(0, 1fr); }
  .footer-legal-inner { padding-block: var(--space-6); }
}

/* =========================================================
   9. 动效降级
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .scroll-progress { display: none; }
  .card:hover, .card:focus-within,
  .footer-nav-list a:hover,
  .btn-primary:hover, .btn-accent:hover, .btn-ghost:hover { transform: none; }
  .copy-toast { transform: translateX(-50%); }
}