:root {
  --color-surface: #f7f7f8;
  --color-surface-alt: #eeeef0;
  --color-surface-deep: #e1e2e4;
  --color-ink: #424852;
  --color-ink-soft: #666e7b;
  --color-ink-muted: #757d8a;
  --color-line: #d6d8da;
  --color-primary: #286dd7;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dae4f3;
  --color-accent: #1d7ea0;
  --color-accent-ink: #ffffff;
  --color-highlight: #d0e1e8;
  --color-focus: #12789c;
  --color-contrast-surface: #0f141c;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #3e4249;
  --color-contrast-accent: #27abd8;
  --overlay-scrim: linear-gradient(180deg, rgba(15, 20, 28, 0.35) 0%, rgba(15, 20, 28, 0.72) 55%, rgba(15, 20, 28, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 14.6px;
  --text-base: 16px;
  --text-lg: 19.2px;
  --text-xl: 23.0px;
  --text-2xl: 27.6px;
  --text-3xl: 33.2px;
  --text-4xl: 39.8px;
  --text-display: clamp(55px, 11.2vw, 144px);
  --text-figure: clamp(46px, 8.1vw, 104px);
  --weight-heading: 689;
  --weight-body: 400;
  --leading-body: 1.83;
  --leading-heading: 1.15;
  --tracking-heading: 0.009em;
  --radius-sm: 14px;
  --radius-md: 16px;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(66, 72, 82, 0.08);
  --shadow-2: 0 18px 44px rgba(66, 72, 82, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1140px;
  --measure: 73ch;
  --gutter: 16px;
  --section-y: 101px;
  --section-y-lg: 141px;
}

/* ==========================================================================
   1. Reset
   ========================================================================== */

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
  background-image:
    radial-gradient(70ch 46ch at 6% 2%, color-mix(in srgb, var(--color-primary) 22%, transparent), transparent 68%),
    radial-gradient(54ch 40ch at 94% 16%, color-mix(in srgb, var(--color-accent) 18%, transparent), transparent 70%),
    radial-gradient(84ch 54ch at 58% 102%, color-mix(in srgb, var(--color-contrast-accent) 13%, transparent), transparent 72%);
  background-attachment: fixed;
  background-repeat: no-repeat;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg,
video { max-width: 100%; display: block; }

button,
input,
select,
textarea { font: inherit; color: inherit; }

a { color: inherit; }

[hidden] { display: none !important; }

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

/* ==========================================================================
   2. 中文排版与标题
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-3);
  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-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-lg); }

p { margin: 0 0 var(--space-3); }

p:last-child,
ul:last-child,
ol:last-child { margin-bottom: 0; }

.t-xs { font-size: var(--text-xs); }
.t-sm { font-size: var(--text-sm); }
.t-base { font-size: var(--text-base); }
.t-lg { font-size: var(--text-lg); }
.t-xl { font-size: var(--text-xl); }
.t-2xl { font-size: var(--text-2xl); }
.t-3xl { font-size: var(--text-3xl); }
.t-4xl { font-size: var(--text-4xl); }

/* 展示级字号：仅用于首屏超大标题与数据大数字 */
.t-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.9;
  letter-spacing: -0.028em;
}

.stat-figure {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.94;
  letter-spacing: -0.024em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.ink-soft { color: var(--color-ink-soft); }
.ink-muted { color: var(--color-ink-muted); }

/* ==========================================================================
   3. 布局工具
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.grid { display: grid; gap: var(--gutter); }
.grid-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.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-12 { grid-column: span 12; }

.stack > * + * { margin-top: var(--space-3); }
.cluster { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }

/* ==========================================================================
   4. 底色层（背景层）
   ========================================================================== */

.band {
  position: relative;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.band h1, .band h2, .band h3, .band h4 { color: var(--color-contrast-ink); }
.band p { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
.band a { color: var(--color-contrast-ink); }

.band--color {
  background:
    linear-gradient(135deg, var(--color-primary) 0%, color-mix(in srgb, var(--color-primary) 62%, var(--color-accent)) 58%, var(--color-accent) 100%);
  color: var(--color-primary-ink);
}

.band--color h1, .band--color h2, .band--color h3, .band--color h4 { color: var(--color-primary-ink); }
.band--color p { color: color-mix(in srgb, var(--color-primary-ink) 86%, transparent); }

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

/* ==========================================================================
   5. 玻璃面板
   ========================================================================== */

.panel {
  position: relative;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.58);
  border: var(--border-thin) solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow-1);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  backdrop-filter: blur(16px) saturate(1.4);
}

.panel--tint {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--color-primary) 16%, transparent), color-mix(in srgb, var(--color-accent) 10%, transparent)),
    rgba(255, 255, 255, 0.5);
}

.panel--dark {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--color-contrast-accent) 13%, transparent), transparent 72%),
    rgba(15, 20, 28, 0.72);
  border-color: rgba(39, 171, 216, 0.35);
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
}

.panel--dark h1, .panel--dark h2, .panel--dark h3, .panel--dark h4 { color: var(--color-contrast-ink); }
.panel--dark p { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }

.panel--flat { padding: var(--space-3); }
.panel--wide { padding: var(--space-6); }

.panel--lift { transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease; }

@media (hover: hover) {
  .panel--lift:hover {
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.88);
    box-shadow: var(--shadow-2);
  }
  .panel--dark.panel--lift:hover { border-color: rgba(39, 171, 216, 0.62); }
}

/* 章节头 */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin-bottom: var(--space-4);
}

.section-head h2 { margin: 0; }

.section-num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

.band .section-num,
.panel--dark .section-num { color: var(--color-contrast-accent); }

/* 左侧竖色条强调 */
.rule-block {
  position: relative;
  padding-left: var(--space-3);
  border-left: 4px solid var(--color-primary);
}

.rule-block--accent { border-left-color: var(--color-accent); }
.rule-block--quiet { border-left-color: var(--color-line); }

.js-on .rule-block {
  border-left-width: 0;
  transition: border-left-width 0.28s ease;
}

.js-on .rule-block.is-inview { border-left-width: 4px; }

.band .rule-block,
.panel--dark .rule-block { border-left-color: var(--color-contrast-accent); }

/* ==========================================================================
   6. 标签 / 状态 / 按钮
   ========================================================================== */

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  background: var(--color-primary-soft);
  color: color-mix(in srgb, var(--color-primary) 76%, var(--color-ink));
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 26%, transparent);
  text-decoration: none;
  white-space: nowrap;
}

.chip--accent {
  background: color-mix(in srgb, var(--color-accent) 14%, transparent);
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 34%, transparent);
}

.chip--dark {
  background: rgba(39, 171, 216, 0.12);
  color: var(--color-contrast-accent);
  border-color: rgba(39, 171, 216, 0.36);
}

.chip--ghost {
  background: transparent;
  color: var(--color-ink-soft);
  border-color: var(--color-line);
}

button.chip { cursor: pointer; }

button.chip[aria-pressed="true"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-accent) 18%, transparent);
  vertical-align: middle;
}

.panel--dark .status-dot,
.band .status-dot {
  background: var(--color-contrast-accent);
  box-shadow: 0 0 0 4px rgba(39, 171, 216, 0.2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: 0 6px 18px color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 86%, var(--color-contrast-surface)); }

.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background: color-mix(in srgb, var(--color-accent) 86%, var(--color-contrast-surface)); }

.btn--ghost {
  background: rgba(255, 255, 255, 0.4);
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }

.btn--onDark {
  background: rgba(39, 171, 216, 0.14);
  color: var(--color-contrast-accent);
  border-color: rgba(39, 171, 216, 0.42);
}

.btn--onDark:hover { background: rgba(39, 171, 216, 0.26); }

.btn:active { transform: translateY(1px); }

/* ==========================================================================
   7. 面包屑 / 正文容器
   ========================================================================== */

.breadcrumb { padding-block: var(--space-2); }

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li { list-style: none; }

.breadcrumb a {
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.breadcrumb a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.breadcrumb-sep { color: var(--color-line); font-size: var(--text-xs); }

.breadcrumb [aria-current="page"] {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.prose h2 { font-size: var(--text-2xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-xl); margin-top: var(--space-4); }
.prose h4 { font-size: var(--text-lg); margin-top: var(--space-3); }
.prose h2:first-child, .prose h3:first-child { margin-top: 0; }

.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 var(--space-3); }
.prose li + li { margin-top: 6px; }

.prose strong { font-weight: var(--weight-heading); }

.panel--dark .prose,
.band .prose { color: var(--color-contrast-ink); }
.panel--dark .prose a,
.band .prose a { color: var(--color-contrast-accent); }

/* ==========================================================================
   8. 图片容器（页面阶段放图）
   ========================================================================== */

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
  isolation: isolate;
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.media-frame--wide > img { aspect-ratio: 21 / 9; }
.media-frame--tall > img { aspect-ratio: 4 / 5; }

.media-frame__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.media-frame--tinted .media-frame__scrim {
  background: linear-gradient(180deg, color-mix(in srgb, var(--color-primary) 60%, transparent), color-mix(in srgb, var(--color-primary) 80%, transparent));
}

.media-frame__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: var(--space-4);
  color: var(--color-contrast-ink);
}

.media-frame__body h2,
.media-frame__body h3 { color: var(--color-contrast-ink); }

.media-frame__placeholder {
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--color-primary) 42%, var(--color-contrast-surface)), var(--color-contrast-surface) 70%),
    var(--color-contrast-surface);
}

/* ==========================================================================
   9. 头部
   ========================================================================== */

.skip-link {
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 999;
  transform: translateY(-220%);
  padding: 10px var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-accent);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: transform 0.18s ease;
}

.skip-link:focus { transform: translateY(0); }

.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 62;
  background: color-mix(in srgb, var(--color-line) 55%, transparent);
  pointer-events: none;
}

.read-progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-contrast-accent));
  transition: width 0.12s linear;
}

.nav-dock {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 50;
  width: 212px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--color-primary) 14%, transparent), color-mix(in srgb, var(--color-accent) 10%, transparent)),
    rgba(247, 247, 248, 0.66);
  border: var(--border-thin) solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-2);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  backdrop-filter: blur(20px) saturate(1.6);
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.brand-capsule {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-contrast-surface);
  border: var(--border-thin) solid rgba(39, 171, 216, 0.3);
  text-decoration: none;
  min-width: 0;
}

.brand-badge {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.brand-words { min-width: 0; }

.brand-name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  line-height: 1.3;
}

.brand-line {
  display: block;
  font-size: var(--text-xs);
  line-height: 1.4;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-rail {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item { list-style: none; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  min-width: 18px;
}

.nav-link:hover {
  background: color-mix(in srgb, var(--color-primary) 12%, transparent);
  border-color: color-mix(in srgb, var(--color-primary) 32%, transparent);
}

.nav-link[aria-current="page"] {
  background: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 72%, #fff);
  color: var(--color-primary-ink);
  box-shadow: 0 6px 18px color-mix(in srgb, var(--color-primary) 34%, transparent);
}

.nav-link[aria-current="page"] .nav-index { color: color-mix(in srgb, var(--color-primary-ink) 72%, transparent); }

.nav-cta {
  display: block;
  padding: 11px 14px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.01em;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.nav-cta:hover { background: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface)); }

.nav-toggle {
  display: none;
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 60;
  align-items: center;
  gap: 9px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid rgba(39, 171, 216, 0.42);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  cursor: pointer;
  box-shadow: var(--shadow-1);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.nav-toggle:hover { border-color: var(--color-contrast-accent); }

.nav-toggle-icon { position: relative; width: 18px; height: 12px; flex: 0 0 auto; }

.nav-toggle-icon i {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--color-contrast-accent);
  transition: transform 0.22s ease, width 0.22s ease, top 0.22s ease, bottom 0.22s ease;
}

.nav-toggle-icon i:first-child { top: 0; }
.nav-toggle-icon i:last-child { bottom: 0; width: 64%; }

.site-header[data-open] .nav-toggle-icon i:first-child { top: 5px; transform: rotate(45deg); }
.site-header[data-open] .nav-toggle-icon i:last-child { bottom: 5px; width: 100%; transform: rotate(-45deg); }

/* ==========================================================================
   10. 页脚
   ========================================================================== */

.site-footer {
  margin-top: var(--section-y-lg);
  padding-block: var(--space-6) var(--space-4);
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--color-primary) 18%, transparent), transparent 62%),
    var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-inline-start: auto;
}

.footer-links a {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

.footer-sep { color: var(--color-contrast-line); font-size: var(--text-xs); }

.footer-icp {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: var(--space-3) 0 0;
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* ==========================================================================
   11. 响应式
   ========================================================================== */

@media (min-width: 1024px) {
  body { padding-left: 244px; }
}

@media (max-width: 1023px) {
  body { padding-top: 68px; }

  .nav-dock {
    top: 0;
    left: 0;
    right: 0;
    width: auto;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-2);
    padding: 11px 108px 11px var(--space-3);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    border-width: 0 0 var(--border-thin) 0;
    border-color: rgba(255, 255, 255, 0.5);
    background:
      linear-gradient(90deg, color-mix(in srgb, var(--color-primary) 14%, transparent), color-mix(in srgb, var(--color-accent) 12%, transparent)),
      rgba(247, 247, 248, 0.84);
    max-height: none;
    overflow: visible;
  }

  .brand-capsule {
    flex: 1 1 auto;
    max-width: 100%;
  }

  .nav-rail {
    position: fixed;
    top: 74px;
    left: 12px;
    right: 12px;
    z-index: 56;
    flex-direction: column;
    gap: 8px;
    padding: 12px;
    border-radius: var(--radius-lg);
    border: var(--border-thin) solid rgba(255, 255, 255, 0.68);
    background:
      linear-gradient(180deg, color-mix(in srgb, var(--color-primary) 12%, transparent), color-mix(in srgb, var(--color-accent) 9%, transparent)),
      rgba(247, 247, 248, 0.9);
    box-shadow: var(--shadow-2);
    -webkit-backdrop-filter: blur(22px) saturate(1.6);
    backdrop-filter: blur(22px) saturate(1.6);
    max-height: calc(100vh - 116px);
    overflow-y: auto;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .site-header[data-open] .nav-rail {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

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

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 6; }
}

@media (max-width: 767px) {
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 2; }

  .panel { padding: var(--space-3); }
  .panel--wide { padding: var(--space-4); }

  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }

  .footer-row { flex-direction: column; align-items: flex-start; }
  .footer-links { margin-inline-start: 0; }
  .media-frame__body { padding: var(--space-3); }
}

/* ==========================================================================
   12. 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;
  }
  .panel--lift:hover { transform: none; }
  .js-on .rule-block { border-left-width: 4px; }
}