:root {
  --color-surface: #fdfdfd;
  --color-surface-alt: #f4f4f4;
  --color-surface-deep: #e7e8e9;
  --color-ink: #464a53;
  --color-ink-soft: #6a707b;
  --color-ink-muted: #777d88;
  --color-line: #dcddde;
  --color-primary: #4d6fb2;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e4e9f2;
  --color-accent: #5e33cc;
  --color-accent-ink: #ffffff;
  --color-highlight: #e0d9f4;
  --color-focus: #5826d9;
  --color-contrast-surface: #161920;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #43464c;
  --color-contrast-accent: #8e70dc;
  --overlay-scrim: linear-gradient(180deg, rgba(22, 25, 32, 0.35) 0%, rgba(22, 25, 32, 0.72) 55%, rgba(22, 25, 32, 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: 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(39px, 8.0vw, 102px);
  --text-figure: clamp(32px, 5.7vw, 73px);
  --weight-heading: 608;
  --weight-body: 400;
  --leading-body: 1.79;
  --leading-heading: 1.2;
  --tracking-heading: -0.002em;
  --radius-sm: 7px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(70, 74, 83, 0.08);
  --shadow-2: 0 18px 44px rgba(70, 74, 83, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1260px;
  --measure: 69ch;
  --gutter: 32px;
  --section-y: 102px;
  --section-y-lg: 143px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

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-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
picture,
svg { max-width: 100%; }

img { border: 0; }

button { font: inherit; }

/* ---------- 中文排版 ---------- */
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;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-base); }
h6 { font-size: var(--text-sm); }

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

ul, ol { margin: 0 0 var(--space-2); padding-left: 1.2em; }
li { margin-bottom: 4px; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}
a:hover { text-decoration: underline; text-underline-offset: 3px; }

strong, b { font-weight: 600; }

small { font-size: var(--text-xs); color: var(--color-ink-muted); }

code, kbd, samp, .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.94em;
}

.num { font-size: 1em; color: inherit; }

hr, .divider {
  height: var(--border-thin);
  border: 0;
  margin: var(--space-4) 0;
  background-color: var(--color-line);
}

::selection {
  background-color: var(--color-highlight);
  color: var(--color-ink);
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.section--contrast :focus-visible { outline-color: var(--color-contrast-accent); }

.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 200;
  padding: 10px 20px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background-color: var(--color-focus);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transform: translate(-50%, -140%);
  transition: transform 0.2s ease;
}
.skip-link:focus {
  transform: translate(-50%, 0);
  text-decoration: none;
  outline: 3px solid var(--color-contrast-ink);
  outline-offset: 2px;
}

/* ---------- 容器与分区 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.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--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4,
.section--contrast h5,
.section--contrast h6 { color: var(--color-contrast-ink); }
.section--contrast a { color: var(--color-contrast-accent); }
.section--contrast p,
.section--contrast li { color: color-mix(in srgb, var(--color-contrast-ink) 88%, transparent); }
.section--contrast hr,
.section--contrast .divider { background-color: var(--color-contrast-line); }

.section-head { max-width: var(--measure); margin-bottom: var(--space-6); }
.section-head p { color: var(--color-ink-soft); }
.section--contrast .section-head p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }

.prose { max-width: var(--measure); }
.prose > *:last-child { margin-bottom: 0; }

.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink-soft);
}
.section--contrast .lede { color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent); }

.eyebrow {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.section--contrast .eyebrow { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.grid--tight { gap: var(--space-3); }
.span-3 { grid-column: span 3; }
.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-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn:hover { text-decoration: none; }
.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--primary:hover {
  background-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}
.btn--ghost {
  background-color: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn--ghost:hover {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.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-contrast-surface));
  color: var(--color-accent-ink);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  white-space: nowrap;
}
.tag--primary { background-color: var(--color-primary-soft); color: var(--color-primary); }
.tag--accent { background-color: color-mix(in srgb, var(--color-accent) 14%, var(--color-surface)); color: var(--color-accent); }
.section--contrast .tag { background-color: color-mix(in srgb, var(--color-contrast-accent) 20%, transparent); color: var(--color-contrast-ink); }

.label-plate {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 数据块 ---------- */
.stat-block { display: grid; gap: 4px; }
.stat-number {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}
.section--contrast .stat-number { color: var(--color-contrast-accent); }
.stat-label {
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}
.section--contrast .stat-label { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.stat-unit {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-left: 4px;
}

/* ---------- 引号强调 ---------- */
.pullquote {
  position: relative;
  margin: var(--space-4) 0;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-8);
  border-radius: var(--radius-md);
  background-color: var(--color-highlight);
  color: var(--color-ink);
  font-size: var(--text-lg);
  line-height: 1.6;
}
.pullquote::before {
  content: "\201C";
  position: absolute;
  left: var(--space-3);
  top: 6px;
  font-family: var(--font-heading);
  font-size: 56px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.5;
}
.pullquote cite {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-style: normal;
  color: var(--color-ink-muted);
}

/* ---------- 图片 / 展签容器 ---------- */
.figure { margin: 0; display: grid; gap: var(--space-2); }
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}
.media > img,
.media > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--3x4 { aspect-ratio: 3 / 4; }

.figure-caption {
  display: flex;
  align-items: baseline;
  gap: 8px;
  max-width: var(--measure);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
}
.figure-caption::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  margin-top: 5px;
  border-radius: 2px;
  background-color: var(--color-accent);
}

.figure--overlay .media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.figure--overlay .figure-caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 1;
  max-width: 44ch;
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background-color: color-mix(in srgb, var(--color-contrast-surface) 74%, transparent);
  color: var(--color-contrast-ink);
}
.figure--overlay .figure-caption::before { background-color: var(--color-contrast-accent); }

/* ---------- 表格 ---------- */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
th {
  background-color: var(--color-surface-deep);
  font-weight: var(--weight-heading);
  text-align: left;
  white-space: nowrap;
}
th, td {
  padding: 10px var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: top;
}
tbody tr:hover { background-color: var(--color-primary-soft); }
td .num, th .num { font-variant-numeric: tabular-nums; }

/* ---------- 分段切换 ---------- */
.segmented {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-deep);
}
.segmented__btn {
  border: 0;
  padding: 7px 14px;
  border-radius: calc(var(--radius-sm) - 2px);
  background-color: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.3;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.18s ease, color 0.18s ease;
}
.segmented__btn:hover { color: var(--color-ink); }
.segmented__btn[aria-selected="true"] {
  background-color: var(--color-surface);
  color: var(--color-primary);
  font-weight: 600;
  box-shadow: var(--shadow-1);
}
.section--contrast .segmented { background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent); }
.section--contrast .segmented__btn { color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent); }
.section--contrast .segmented__btn[aria-selected="true"] {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
}

/* ---------- 显现 ---------- */
html[data-motion="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
html[data-motion="on"] [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 顶部命令栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
  transition: box-shadow 0.2s ease;
}
.site-header[data-stuck="true"] { box-shadow: var(--shadow-1); }

.header-bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  padding-block: var(--space-2);
  transition: padding 0.2s ease;
}
.site-header[data-stuck="true"] .header-bar { padding-block: 10px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-ink);
  text-decoration: none;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  position: relative;
  flex: none;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  overflow: hidden;
}
.brand-mark::before {
  content: "";
  width: 15px;
  height: 15px;
  border: 1.5px solid var(--color-contrast-accent);
  border-radius: var(--radius-pill);
}
.brand-mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  background-color: color-mix(in srgb, var(--color-contrast-accent) 55%, transparent);
}

.brand-text { display: grid; gap: 1px; line-height: 1.1; }
.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.site-nav { min-width: 0; }
.nav-list {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-list li { margin: 0; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 9px 12px 11px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.3;
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, background-color 0.18s ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
}
.nav-link:hover,
.nav-link:focus-visible {
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
  text-decoration: none;
}
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: 600;
}
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-self: end;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: currentColor;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: currentColor;
  transition: transform 0.2s ease, top 0.2s ease;
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

.header-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px var(--space-2);
  margin: 0;
  padding-block: 7px var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}

.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 22%, transparent);
  animation: status-pulse 2.6s ease-in-out infinite;
}
@keyframes status-pulse {
  0%, 100% { box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 22%, transparent); }
  50% { box-shadow: 0 0 0 7px color-mix(in srgb, var(--color-accent) 6%, transparent); }
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background-color: color-mix(in srgb, var(--color-line) 60%, transparent);
  pointer-events: none;
}
.scroll-progress__fill {
  display: block;
  height: 100%;
  width: var(--progress, 0%);
  background-color: var(--color-primary);
  transition: width 0.1s linear;
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  background-color: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: var(--space-2) 0;
  list-style: none;
}
.breadcrumbs li { margin: 0; color: var(--color-ink-muted); }
.breadcrumbs li + li::before {
  content: "/";
  margin-right: 6px;
  color: color-mix(in srgb, var(--color-line) 60%, var(--color-ink-muted));
}
.breadcrumbs a { color: var(--color-ink-soft); }
.breadcrumbs a:hover { color: var(--color-primary); }

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-block: var(--space-6) var(--space-4);
  font-size: var(--text-sm);
  line-height: 1.6;
}
.footer-inner { display: grid; gap: var(--space-3); }

.footer-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-brand {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.footer-nav { min-width: 0; }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-links li { margin: 0; }
.footer-link {
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  text-decoration: underline;
  text-decoration-color: var(--color-contrast-line);
  text-underline-offset: 3px;
}
.footer-link:hover {
  color: var(--color-contrast-accent);
  text-decoration-color: currentColor;
}
.footer-icp {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent);
}

.footer-meta {
  display: grid;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}
.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 4px var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-contact li { margin: 0; }
.footer-contact__key {
  display: inline-block;
  min-width: 2.4em;
  margin-right: 6px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 46%, transparent);
}
.footer-note { margin: 0; max-width: var(--measure); }
.footer-copy { margin: 0; font-family: var(--font-mono); }

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .nav-link { padding-inline: 9px; font-size: var(--text-sm); }
  .header-bar { gap: var(--space-2); }
}

@media (max-width: 960px) {
  :root { --section-y: 72px; --section-y-lg: 96px; }
  html { scroll-padding-top: 108px; }

  .header-bar {
    grid-template-columns: auto auto;
    justify-content: space-between;
    padding-block: 10px;
  }
  .site-header[data-stuck="true"] .header-bar { padding-block: 8px; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    padding: var(--space-2) var(--space-3) var(--space-3);
    background-color: var(--color-surface);
    border-bottom: var(--border-thin) solid var(--color-line);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open="true"] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .nav-link {
    justify-content: flex-start;
    padding: 12px var(--space-2) 14px;
    font-size: var(--text-base);
  }
  .nav-link::after { left: var(--space-2); right: var(--space-2); bottom: 6px; }

  .nav-toggle { display: inline-flex; }

  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: var(--space-3); }
  .span-3, .span-4, .span-5 { grid-column: span 3; }
  .span-6, .span-7, .span-8, .span-9 { grid-column: span 6; }
}

@media (max-width: 640px) {
  :root { --section-y: 56px; --section-y-lg: 72px; }

  .container { padding-inline: var(--space-3); }
  .header-actions .btn { display: none; }
  .brand-sub { display: none; }
  .header-status { font-size: 11px; }

  .grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-2); }
  .grid > * { grid-column: 1 / -1; }

  .footer-bar { align-items: flex-start; }
  .footer-icp { margin-left: 0; }
  .figure--overlay .figure-caption { left: var(--space-2); right: var(--space-2); bottom: var(--space-2); }
  .segmented { display: flex; width: 100%; overflow-x: auto; }
}

/* ---------- 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;
  }
  html[data-motion="on"] [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .status-dot { animation: none; }
}

@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .scroll-progress { display: none; }
}