:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #efefef;
  --color-surface-deep: #e0e1e1;
  --color-ink: #2c3433;
  --color-ink-soft: #556260;
  --color-ink-muted: #6e7d79;
  --color-line: #d4d6d5;
  --color-primary: #20836e;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dbe8e6;
  --color-accent: #cc3388;
  --color-accent-ink: #ffffff;
  --color-highlight: #f1d5e5;
  --color-focus: #d02484;
  --color-contrast-surface: #0e1816;
  --color-contrast-ink: #e4e7e6;
  --color-contrast-line: #3d4644;
  --color-contrast-accent: #d34f99;
  --overlay-scrim: linear-gradient(180deg, rgba(14, 24, 22, 0.35) 0%, rgba(14, 24, 22, 0.72) 55%, rgba(14, 24, 22, 0.92) 100%);
  --font-heading: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, 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(50px, 10.2vw, 131px);
  --text-figure: clamp(41px, 7.3vw, 94px);
  --weight-heading: 753;
  --weight-body: 400;
  --leading-body: 1.69;
  --leading-heading: 1.3;
  --tracking-heading: -0.009em;
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 2px;
  --radius-pill: 2px;
  --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: 1200px;
  --measure: 72ch;
  --gutter: 16px;
  --section-y: 93px;
  --section-y-lg: 130px;
}

/* ============ reset ============ */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  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);
  text-wrap: balance;
}

p { margin: 0 0 var(--space-2); text-wrap: pretty; }
ul, ol { margin: 0 0 var(--space-2); padding-left: 1.15em; }
li { margin: 0 0 4px; }
a { color: var(--color-primary); text-decoration: none; transition: color .16s ease, border-color .16s ease, background-color .16s ease; }
a:hover { color: var(--color-focus); }
img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { width: 100%; border-collapse: collapse; }
hr { border: 0; }

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

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

main { display: block; }

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

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
}
.split--reverse { grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); }

.grid { display: grid; gap: var(--space-3); }
.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)); }

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

/* ============ 分隔语言 ============ */
.rule-double {
  border: 0;
  border-top: 3px double var(--color-line);
  margin: 0;
}

.panel {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
}

.panel-contrast,
.is-contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.is-contrast h1, .is-contrast h2, .is-contrast h3 { color: var(--color-contrast-ink); }

/* ============ 标题 / 数字 ============ */
.display {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: .92;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.display-contrast { color: var(--color-contrast-ink); }

.figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: .9;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.section-head { margin-bottom: var(--space-4); }
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.section-title {
  margin: 0;
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
}

.mark {
  background: linear-gradient(180deg, transparent 58%, color-mix(in srgb, var(--color-accent) 26%, transparent) 58%);
  color: var(--color-ink);
  padding: 0 1px;
}

/* ============ 标签 / 徽标 ============ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .06em;
  white-space: nowrap;
}
.tag-primary { background: var(--color-primary-soft); border-color: var(--color-primary); color: var(--color-primary); }
.tag-accent { background: var(--color-highlight); border-color: var(--color-accent); color: var(--color-accent); }
.tag-contrast { background: transparent; border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 18px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  transition: transform .16s ease, background-color .16s ease, color .16s ease, border-color .16s ease;
}
.btn:hover { transform: translateX(2px); }
.btn-primary { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.btn-primary:hover { background: color-mix(in srgb, var(--color-primary) 84%, 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); }
.btn-accent:hover { background: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface)); color: var(--color-accent-ink); }
.btn-ghost { border-color: var(--color-line); color: var(--color-ink); }
.btn-ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-sm {
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .05em;
}

/* ============ 面包屑 ============ */
.breadcrumb {
  border-bottom: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: var(--space-2) 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.breadcrumb-list li { margin: 0; }
.breadcrumb-list li + li::before { content: "/"; margin-right: var(--space-1); color: var(--color-line); }
.breadcrumb-list a { color: var(--color-ink-soft); }
.breadcrumb-list a:hover { color: var(--color-primary); }

/* ============ 索引列表 ============ */
.index-list { margin: 0; padding: 0; list-style: none; }
.index-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.index-item:hover { background: var(--color-surface-alt); }
.index-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.index-item:hover .index-num { color: var(--color-accent); }

/* ============ 图片容器 ============ */
.media-frame {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
}
.media-frame > img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--paper { background: var(--color-surface); padding: 8px; }
.media-frame--contrast { background: var(--color-contrast-surface); border-color: var(--color-contrast-line); }
.media-scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  margin: 0;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .04em;
  color: var(--color-contrast-ink);
}

/* ============ skip link ============ */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -80px;
  z-index: 200;
  padding: var(--space-1) var(--space-2);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  transition: top .16s ease;
}
.skip-link:focus { top: var(--space-2); color: var(--color-accent-ink); }

/* ============ 页头 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--color-surface);
  border-bottom: 3px double var(--color-line);
}

.header-progress {
  height: 3px;
  background: var(--color-surface-deep);
  overflow: hidden;
}
.progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary) 62%, var(--color-accent) 100%);
  transition: width .12s linear;
}

.header-shell {
  display: grid;
  grid-template-columns: minmax(0, 38%) minmax(0, 1fr);
  align-items: stretch;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.header-brand {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-right: var(--border-thick) solid var(--color-contrast-line);
}

.brand-mark {
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: inherit;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}
.brand-mark:hover { color: inherit; border-bottom-color: var(--color-contrast-accent); }
.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  line-height: 1.2;
  color: var(--color-contrast-ink);
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .05em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.header-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) 0 var(--space-2) var(--space-4);
  background: var(--color-surface);
}

.header-status {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  animation: status-breath 2.6s ease-in-out infinite;
}
@keyframes status-breath {
  0%, 100% { opacity: 1; }
  50% { opacity: .42; }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.header-progress-text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  white-space: nowrap;
}
.header-progress-text b { color: var(--color-primary); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 7px 12px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .06em;
}
.nav-toggle-bars { display: inline-flex; flex-direction: column; gap: 3px; }
.nav-toggle-bars i { display: block; width: 14px; height: 1px; background: currentColor; }

/* ============ 命令栏导航 ============ */
.command-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  border-top: var(--border-thin) solid var(--color-line);
}

.command-list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  margin: 0;
  padding: 0;
  list-style: none;
}
.cmd-item { margin: 0; border-right: var(--border-thin) solid var(--color-line); }
.cmd-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: 12px 18px;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}
.cmd-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  transition: color .16s ease;
}
.cmd-label { white-space: nowrap; }
.cmd-link:hover { background: var(--color-surface-alt); color: var(--color-ink); }
.cmd-link:hover .cmd-index { color: var(--color-primary); }
.cmd-link[aria-current="page"] {
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-weight: 600;
}
.cmd-link[aria-current="page"] .cmd-index { color: var(--color-primary); }
.cmd-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--color-primary);
}

.command-current {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  white-space: nowrap;
}
.command-current b { color: var(--color-accent); }

/* ============ 页脚 ============ */
.site-footer {
  background: var(--color-surface-alt);
  border-top: 3px double var(--color-line);
  padding-block: var(--section-y) var(--space-6);
}
.footer-shell {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-ribbon {
  display: grid;
  grid-template-columns: minmax(0, 38%) minmax(0, 1fr);
  align-items: stretch;
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}

.footer-ribbon-brand {
  padding: var(--space-4);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-right: var(--border-thick) solid var(--color-contrast-line);
}
.footer-brand-name {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.footer-brand-tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .05em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.footer-nav {
  display: flex;
  align-items: center;
  padding: var(--space-3) var(--space-4);
}
.footer-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-nav-list li { margin: 0; }
.footer-nav-list a {
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  border-bottom: var(--border-thin) solid transparent;
  padding-bottom: 2px;
}
.footer-nav-list a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.footer-panels {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.footer-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}
.footer-card-title {
  margin: 0;
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.footer-card-text {
  margin: 0;
  font-size: var(--text-sm);
  color: inherit;
}
.footer-card-note {
  margin: 0;
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
}
.footer-card--access .footer-card-title {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-line);
}

.footer-contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-1);
}
.footer-contact-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1);
  margin: 0;
  font-size: var(--text-sm);
}
.contact-key {
  min-width: 64px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.contact-val { color: var(--color-ink); font-weight: 500; word-break: break-all; }

.copy-btn {
  padding: 2px 8px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  transition: background-color .16s ease, color .16s ease, border-color .16s ease;
}
.copy-btn:hover { background: var(--color-primary); color: var(--color-primary-ink); }
.copy-btn[data-copied] {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.footer-copy-status {
  min-height: 1.2em;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
}

.footer-tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.footer-card-link {
  margin-top: auto;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .05em;
  color: var(--color-contrast-accent);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  padding-bottom: 2px;
}
.footer-card-link:hover { color: var(--color-contrast-ink); border-bottom-color: var(--color-contrast-accent); }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-legal-links li { margin: 0; }
.footer-legal-links a {
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  border-bottom: var(--border-thin) solid var(--color-line);
  padding-bottom: 2px;
}
.footer-legal-links a:hover { color: var(--color-accent); border-bottom-color: var(--color-accent); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding-top: var(--space-2);
  border-top: 3px double var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.footer-base p { margin: 0; }
.footer-copyright { font-family: var(--font-mono); font-size: var(--text-xs); }
.footer-note { font-size: var(--text-xs); }

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

@media (max-width: 900px) {
  .header-shell { grid-template-columns: minmax(0, 1fr); }
  .header-brand {
    border-right: 0;
    border-bottom: var(--border-thick) solid var(--color-contrast-line);
    padding: var(--space-2) var(--space-3);
  }
  .header-meta {
    padding: var(--space-2) 0;
    gap: var(--space-2);
  }
  .nav-toggle { display: inline-flex; }

  .command-nav {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-2) var(--gutter) var(--space-3);
    background: var(--color-contrast-surface);
    color: var(--color-contrast-ink);
    border-top: var(--border-thick) solid var(--color-contrast-line);
  }
  .command-nav[data-open] { display: flex; }
  .command-list { flex-direction: column; }
  .cmd-item { border-right: 0; border-bottom: var(--border-thin) solid var(--color-contrast-line); }
  .cmd-link {
    justify-content: space-between;
    padding: 14px 4px;
    color: var(--color-contrast-ink);
    font-size: var(--text-base);
  }
  .cmd-index { color: var(--color-contrast-accent); }
  .cmd-link:hover { background: transparent; color: var(--color-contrast-accent); }
  .cmd-link[aria-current="page"] {
    background: transparent;
    color: var(--color-contrast-accent);
  }
  .cmd-link[aria-current="page"]::after { display: none; }
  .command-current { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

  .split,
  .split--reverse { grid-template-columns: minmax(0, 1fr); }
  .footer-ribbon { grid-template-columns: minmax(0, 1fr); }
  .footer-ribbon-brand { border-right: 0; border-bottom: var(--border-thick) solid var(--color-contrast-line); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .footer-panels { grid-template-columns: minmax(0, 1fr); }
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .header-progress-text { display: none; }
  .header-status { font-size: var(--text-xs); }
  .panel { padding: var(--space-3); }
  .section { padding-block: calc(var(--section-y) * .62); }
  .section-lg { padding-block: calc(var(--section-y-lg) * .62); }
  .site-footer { padding-block: calc(var(--section-y) * .62) var(--space-4); }
}

@media (max-width: 560px) {
  .footer-nav { padding: var(--space-3); }
  .footer-base { flex-direction: column; }
  .index-item { grid-template-columns: 44px minmax(0, 1fr); }
  .btn { width: 100%; justify-content: center; }
  .header-actions .btn { width: auto; }
}

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