:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f1f1f2;
  --color-surface-deep: #e5e5e6;
  --color-ink: #474852;
  --color-ink-soft: #6c6d7a;
  --color-ink-muted: #797b86;
  --color-line: #dadadc;
  --color-primary: #2c41d3;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dde0f5;
  --color-accent: #11860e;
  --color-accent-ink: #ffffff;
  --color-highlight: #d0e5d0;
  --color-focus: #0a8306;
  --color-contrast-surface: #171a2b;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #444754;
  --color-contrast-accent: #1ee619;
  --overlay-scrim: linear-gradient(180deg, rgba(23, 26, 43, 0.35) 0%, rgba(23, 26, 43, 0.72) 55%, rgba(23, 26, 43, 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: 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(49px, 10.0vw, 128px);
  --text-figure: clamp(40px, 7.2vw, 92px);
  --weight-heading: 717;
  --weight-body: 400;
  --leading-body: 1.66;
  --leading-heading: 1.25;
  --tracking-heading: -0.003em;
  --radius-sm: 13px;
  --radius-md: 18px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --border-thin: 2px;
  --border-thick: 3px;
  --shadow-1: 0 1px 0 rgba(71, 72, 82, 0.12);
  --shadow-2: 0 2px 0 rgba(71, 72, 82, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1180px;
  --measure: 72ch;
  --gutter: 24px;
  --section-y: 83px;
  --section-y-lg: 116px;
}

/* ============ 1. reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; border-radius: 6px; }
::selection { background-color: var(--color-primary); color: var(--color-primary-ink); }

/* ============ 2. 中文排版基线 ============ */
body {
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  font-weight: var(--weight-body);
  letter-spacing: 0.008em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, .font-heading {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  text-wrap: balance;
}

p { text-wrap: pretty; }

.num,
.footer-mail,
.footer-tel,
.hero-figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.hero-display {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.92;
  letter-spacing: -0.035em;
}

.hero-figure {
  font-size: var(--text-figure);
  line-height: 0.9;
  font-weight: 700;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 3px;
  border-radius: 2px;
  background-color: currentColor;
}

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

.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-2); }
.prose h2 { font-size: var(--text-2xl); margin-top: var(--space-6); margin-bottom: var(--space-2); }
.prose h3 { font-size: var(--text-xl); margin-top: var(--space-4); margin-bottom: var(--space-1); }
.prose ul, .prose ol { margin-top: var(--space-2); padding-left: 1.4em; }
.prose li { list-style: disc; margin-bottom: 6px; }

/* ============ 3. 容器与区块 ============ */
.shell {
  width: min(100% - (var(--gutter) * 2), var(--container));
  margin-inline: auto;
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep { background-color: var(--color-surface-deep); }

.section--dark {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: var(--color-contrast-ink); }
.section--dark .lede { color: var(--color-contrast-ink); opacity: 0.82; }
.section--dark .eyebrow { color: var(--color-contrast-accent); }

.section--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.section--primary h1, .section--primary h2, .section--primary h3 { color: var(--color-primary-ink); }
.section--primary .lede { color: var(--color-primary-ink); opacity: 0.88; }
.section--primary .eyebrow { color: var(--color-primary-ink); }

.section--inset .shell { padding-inline-start: clamp(0px, 3vw, 56px); }
.section--inset-alt .shell { padding-inline-end: clamp(0px, 4vw, 72px); }

.section--dark + .section--dark { border-top: var(--border-thin) solid var(--color-contrast-line); }

/* ============ 4. 栅格 ============ */
.grid {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: var(--gutter);
}

.auto-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.stack > * + * { margin-top: var(--space-2); }

/* ============ 5. 按钮与状态标签 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 14px 26px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1.2;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-2);
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease, transform 0.22s ease;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

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

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

.btn--ghost { background-color: transparent; border-color: var(--color-line); color: var(--color-ink); box-shadow: none; }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn--onDark { background-color: transparent; border-color: var(--color-contrast-line); color: var(--color-contrast-ink); box-shadow: none; }
.btn--onDark:hover { background-color: var(--color-contrast-accent); border-color: var(--color-contrast-accent); color: var(--color-contrast-surface); }

.chip {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background-color: transparent;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.4;
}

.chip--live { background-color: var(--color-accent); border-color: var(--color-accent); color: var(--color-accent-ink); }
.chip--flag { background-color: var(--color-highlight); border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-highlight)); color: color-mix(in srgb, var(--color-accent) 78%, var(--color-ink)); }
.chip--muted { background-color: var(--color-surface-deep); border-color: var(--color-line); color: var(--color-ink-soft); }
.chip--key { background-color: var(--color-primary-soft); border-color: color-mix(in srgb, var(--color-primary) 34%, var(--color-primary-soft)); color: var(--color-primary); }

.section--dark .chip { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.section--dark .chip--flag { background-color: var(--color-contrast-accent); border-color: var(--color-contrast-accent); color: var(--color-contrast-surface); }

.chip[data-note] { cursor: help; }

.chip[data-note]::after {
  content: attr(data-note);
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  z-index: 6;
  min-width: 210px;
  max-width: 280px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0;
  text-transform: none;
  line-height: 1.55;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  pointer-events: none;
}

.chip[data-note]:hover::after,
.chip[data-note]:focus-visible::after { opacity: 1; visibility: visible; transform: translateY(0); }

/* ============ 6. 图片容器（页面阶段复用） ============ */
.media-figure {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-2);
}

.media-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.62) contrast(1.06) brightness(0.94);
}

.media-figure--wide { aspect-ratio: 16 / 9; }
.media-figure--tall { aspect-ratio: 3 / 4; }
.media-figure--band { aspect-ratio: 21 / 9; }
.media-figure--square { aspect-ratio: 1 / 1; }

.media-figure__scrim {
  position: absolute;
  inset: 0;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}

.media-figure__cap {
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.media-figure__data {
  position: absolute;
  top: 14px;
  left: var(--space-2);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 82%, transparent);
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
}

/* ============ 7. 装饰形状 ============ */
.orn { position: absolute; pointer-events: none; }

.orn--ring {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: var(--border-thick) solid var(--color-contrast-accent);
  opacity: 0.32;
}

.orn--dot {
  width: 96px;
  height: 96px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  opacity: 0.5;
}

/* ============ 8. 面包屑与分页 ============ */
.breadcrumb {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.breadcrumb li { display: inline-flex; align-items: center; }
.breadcrumb li + li::before { content: "/"; margin-right: var(--space-1); color: var(--color-line); }
.breadcrumb a { color: var(--color-ink-soft); border-bottom: 1px solid transparent; }
.breadcrumb a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); font-weight: var(--weight-heading); }

.pager {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: space-between;
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-3);
}

.pager a {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-primary);
}

.pager a:hover { color: var(--color-accent); }

/* ============ 9. 头部 ============ */
.site-header {
  --header-h: 76px;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  color: var(--color-contrast-ink);
  background-color: transparent;
  border-bottom: var(--border-thin) solid transparent;
  transition: background-color 0.26s ease, border-color 0.26s ease, color 0.26s ease;
}

.site-header[data-stuck="true"] {
  background-color: var(--color-contrast-surface);
  border-bottom-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
}

.skip-link {
  position: absolute;
  top: -120px;
  left: var(--gutter);
  z-index: 200;
  padding: 12px 22px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  transition: top 0.2s ease;
}

.skip-link:focus { top: 0; }

.header-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-badge {
  display: grid;
  place-items: center;
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  transform: rotate(-5deg);
  box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--color-primary-ink) 32%, transparent);
}

.brand-lockup { display: flex; flex-direction: column; gap: 1px; min-width: 0; }

.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.brand-tag {
  font-size: var(--text-xs);
  line-height: 1.3;
  letter-spacing: 0.06em;
  opacity: 0.7;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid currentColor;
  color: inherit;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-toggle:hover { background-color: color-mix(in srgb, var(--color-contrast-accent) 22%, transparent); }

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: background-color 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  transition: transform 0.22s ease, opacity 0.22s ease;
}

.nav-toggle-icon::before { top: -6px; }
.nav-toggle-icon::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { transform: translateY(-6px) rotate(-45deg); }

.site-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: var(--space-4) var(--gutter) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  overflow-y: auto;
  background-color: var(--color-contrast-surface);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s ease;
}

.site-nav[data-open="true"] { opacity: 1; visibility: visible; transform: none; }

.nav-list { display: flex; flex-direction: column; gap: var(--space-1); }

.nav-list a {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1.2;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list a:hover { background-color: color-mix(in srgb, var(--color-contrast-ink) 14%, transparent); }

.nav-list a[aria-current="page"] {
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.nav-rail { display: flex; flex-direction: column; gap: var(--space-1); }

.nav-rail-title {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

.nav-quick { display: flex; flex-direction: column; gap: 6px; }

.nav-quick a {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.nav-quick a:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background-color: var(--color-contrast-accent);
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: var(--gutter);
  bottom: var(--gutter);
  z-index: 130;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  box-shadow: var(--shadow-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s ease, background-color 0.24s ease;
}

.to-top[data-visible="true"] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background-color: var(--color-contrast-surface); border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }

/* ============ 10. 页脚 ============ */
.site-footer {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.footer-stair {
  position: relative;
  overflow: hidden;
  padding-block: var(--section-y);
  background-color: var(--color-contrast-surface);
}

.footer-stair .orn--ring { top: -70px; right: 7%; }
.footer-stair .orn--dot { bottom: -48px; left: 5%; transform: rotate(18deg); }

.footer-stair-inner { position: relative; z-index: 1; }

.footer-kicker {
  margin-bottom: var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

.footer-kicker--on-primary { color: var(--color-primary-ink); opacity: 0.78; margin-bottom: var(--space-1); }

.footer-nav-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2) var(--space-4);
}

.footer-nav-list li:nth-child(2n) { padding-left: var(--space-3); }
.footer-nav-list li:nth-child(4n) { padding-left: var(--space-6); }

.footer-nav-list a {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  line-height: 1.3;
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.footer-nav-list a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
  transform: translateX(6px);
}

.footer-subnav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.footer-subnav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.footer-subnav-link::after { content: "→"; color: var(--color-contrast-accent); }

.footer-subnav-link:hover {
  background-color: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.footer-subnav-link:hover::after { color: var(--color-contrast-surface); }

.footer-contact {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  padding-block: var(--space-6);
}

.footer-contact-inner {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  align-items: end;
}

.footer-contact-block { min-width: 0; }

.footer-mail,
.footer-tel {
  display: inline-block;
  font-size: var(--text-lg);
  line-height: 1.3;
  color: var(--color-primary-ink);
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary-ink) 45%, transparent);
  padding-bottom: 4px;
  word-break: break-all;
}

.footer-address {
  display: inline-block;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-primary-ink) 84%, var(--color-primary));
}

.footer-legal {
  background-color: var(--color-contrast-surface);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-block: var(--space-4) var(--space-6);
}

.footer-legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.footer-legal-note { flex: 1 1 320px; }

.footer-legal-links { display: flex; flex-wrap: wrap; gap: var(--space-3); }

.footer-legal-links a {
  color: var(--color-contrast-ink);
  border-bottom: 1px solid var(--color-contrast-line);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.footer-legal-links a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.footer-icp { font-family: var(--font-mono); color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent); }
.footer-copy { font-family: var(--font-mono); }

/* ============ 11. 主内容锚点 ============ */
#main-content { display: block; scroll-margin-top: 88px; }

/* ============ 12. 平板与桌面 ============ */
@media (min-width: 720px) {
  .footer-nav-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-nav-list li:nth-child(2n) { padding-left: 0; }
  .footer-nav-list li:nth-child(3n + 2) { padding-left: var(--space-4); }
  .footer-nav-list li:nth-child(3n) { padding-left: var(--space-6); }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    flex-direction: row;
    align-items: center;
    gap: var(--space-2);
    margin-left: auto;
    padding: 0;
    border-top: 0;
    background-color: transparent;
    overflow: visible;
    opacity: 1;
    visibility: visible;
    transform: none;
  }

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

  .nav-list a {
    min-height: 40px;
    padding: 0 12px;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    letter-spacing: 0.01em;
  }

  .nav-list a:hover { background-color: color-mix(in srgb, var(--color-contrast-ink) 16%, transparent); }

  .nav-rail { display: none; }

  .grid { grid-template-columns: repeat(9, minmax(0, 1fr)); }
}

@media (min-width: 1100px) {
  .nav-rail {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-1);
    margin-left: var(--space-1);
    padding-left: var(--space-3);
    border-left: var(--border-thin) solid var(--color-contrast-line);
  }

  .nav-rail-title { display: none; }
  .nav-quick { flex-direction: row; align-items: center; }
}

@media (max-width: 899px) {
  .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .footer-nav-list a { font-size: var(--text-lg); }
}

@media (max-width: 640px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-nav-list { grid-template-columns: 1fr; }
  .footer-nav-list li:nth-child(n) { padding-left: 0; }
  .footer-nav-list a { font-size: var(--text-lg); }
  .brand-tag { display: none; }
  .to-top { right: var(--space-2); bottom: var(--space-2); padding: 10px 16px; }
}

/* ============ 13. 无障碍与动效偏好 ============ */
@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-behavior: auto !important;
  }
  .btn:hover, .to-top, .footer-nav-list a:hover { transform: none; }
}