:root {
  --color-surface: #fcfcfc;
  --color-surface-alt: #f2f2f2;
  --color-surface-deep: #e3e4e4;
  --color-ink: #2f3437;
  --color-ink-soft: #5a6267;
  --color-ink-muted: #767e84;
  --color-line: #d7d8d9;
  --color-primary: #2479b8;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #deeaf2;
  --color-accent: #a06c18;
  --color-accent-ink: #ffffff;
  --color-highlight: #ebe2d3;
  --color-focus: #9b650d;
  --color-contrast-surface: #18242d;
  --color-contrast-ink: #e4e6e7;
  --color-contrast-line: #454f56;
  --color-contrast-accent: #de9621;
  --overlay-scrim: linear-gradient(180deg, rgba(24, 36, 45, 0.35) 0%, rgba(24, 36, 45, 0.72) 55%, rgba(24, 36, 45, 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: 9.5px;
  --text-sm: 13.5px;
  --text-base: 16px;
  --text-lg: 22.6px;
  --text-xl: 32.0px;
  --text-2xl: 45.2px;
  --text-3xl: 64.0px;
  --text-4xl: 90.4px;
  --text-display: clamp(55px, 11.4vw, 146px);
  --text-figure: clamp(46px, 8.2vw, 105px);
  --weight-heading: 802;
  --weight-body: 400;
  --leading-body: 1.69;
  --leading-heading: 1.28;
  --tracking-heading: -0.006em;
  --radius-sm: 1px;
  --radius-md: 1px;
  --radius-lg: 1px;
  --radius-pill: 1px;
  --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: 1260px;
  --measure: 71ch;
  --gutter: 24px;
  --section-y: 102px;
  --section-y-lg: 143px;
}

/* =========================================================
   1. Reset
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

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

/* =========================================================
   2. 页面基底：浅底 + 深墨正文，左侧框架栏由 --rail-w 定义
   ========================================================= */
body {
  --rail-w: calc((var(--container) - 9 * var(--gutter)) / 10 * 2 + var(--gutter));
  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);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

p { text-wrap: pretty; }

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

/* =========================================================
   3. 容器与栅格
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--flush { padding-inline: 0; }

.grid-10 {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: var(--gutter);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gutter);
}

.stack > * + * { margin-top: var(--space-3); }

/* =========================================================
   4. 色块反转分区（相邻章节主色与底色互换）
   ========================================================= */
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-8); }
.section--flush-top { padding-block-start: 0; }
.section--flush-bottom { padding-block-end: 0; }

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

.section--primary a:focus-visible,
.section--contrast a:focus-visible { outline-color: var(--color-focus); }

/* =========================================================
   5. 文字与标题层级
   ========================================================= */
.display {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.92;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.figure-num {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-figure);
  line-height: 0.95;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.title-3xl { font-size: var(--text-3xl); letter-spacing: -0.02em; }
.title-2xl { font-size: var(--text-2xl); letter-spacing: -0.02em; }
.title-xl  { font-size: var(--text-xl); }
.title-lg  { font-size: var(--text-lg); }

.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.section--primary .eyebrow { color: color-mix(in srgb, var(--color-primary-ink) 70%, var(--color-primary)); }
.section--contrast .eyebrow { color: var(--color-contrast-accent); }

.lede {
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink-soft);
  max-width: 46ch;
}

.section--primary .lede { color: color-mix(in srgb, var(--color-primary-ink) 88%, var(--color-primary)); }
.section--contrast .lede { color: color-mix(in srgb, var(--color-contrast-ink) 84%, var(--color-contrast-surface)); }

.text-soft { color: var(--color-ink-soft); }
.text-muted { color: var(--color-ink-muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* =========================================================
   6. 标签与徽标（强调机制）
   ========================================================= */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.1em;
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border: var(--border-thin) solid var(--color-accent);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag--soft {
  background-color: var(--color-highlight);
  color: var(--color-accent);
  border-color: var(--color-highlight);
}

.tag--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}

.tag--on-contrast {
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-accent);
}

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

/* =========================================================
   7. 按钮
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 13px 24px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-base);
  line-height: 1;
  letter-spacing: 0.01em;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  transition: background-color 140ms linear, color 140ms linear, border-color 140ms linear;
}

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

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

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

.btn--on-dark {
  background-color: transparent;
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.btn--on-dark:hover {
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-accent);
}

/* =========================================================
   8. 面包屑（分隔符为 1px 竖细线）
   ========================================================= */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.breadcrumb a {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 140ms linear, border-color 140ms linear;
}

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

.breadcrumb__sep {
  width: var(--border-thin);
  height: 12px;
  background-color: var(--color-line);
}

.breadcrumb--on-dark { color: color-mix(in srgb, var(--color-contrast-ink) 62%, var(--color-contrast-surface)); }
.breadcrumb--on-dark a { color: var(--color-contrast-ink); }
.breadcrumb--on-dark a:hover { color: var(--color-contrast-accent); border-bottom-color: var(--color-contrast-accent); }
.breadcrumb--on-dark .breadcrumb__sep { background-color: var(--color-contrast-line); }

/* =========================================================
   9. 正文块
   ========================================================= */
.prose {
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.prose > * + * { margin-top: var(--space-3); }

.prose h2 {
  font-size: var(--text-xl);
  color: var(--color-ink);
  margin-top: var(--space-6);
}

.prose h3 {
  font-size: var(--text-lg);
  color: var(--color-ink);
  margin-top: var(--space-4);
}

.prose strong { color: var(--color-ink); font-weight: 700; }

.prose a {
  color: var(--color-primary);
  border-bottom: var(--border-thin) solid currentColor;
}

.prose ul { list-style: square; padding-left: 1.15em; }
.prose ol { list-style: decimal; padding-left: 1.35em; }
.prose li + li { margin-top: var(--space-1); }

.prose--on-dark { color: color-mix(in srgb, var(--color-contrast-ink) 80%, var(--color-contrast-surface)); }
.prose--on-dark h2, .prose--on-dark h3, .prose--on-dark strong { color: var(--color-contrast-ink); }
.prose--on-dark a { color: var(--color-contrast-accent); }

/* =========================================================
   10. 细实线分隔
   ========================================================= */
.rule {
  height: var(--border-thin);
  background-color: var(--color-line);
}

.rule--on-primary { background-color: color-mix(in srgb, var(--color-primary-ink) 32%, var(--color-primary)); }
.rule--on-dark { background-color: var(--color-contrast-line); }
.rule--accent { background-color: var(--color-accent); }

/* =========================================================
   11. 图片容器（供页面阶段放置占位）
   ========================================================= */
.figure {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-sm);
}

.figure__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__tint {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.42;
  mix-blend-mode: multiply;
}

.figure--cool .figure__tint { background-color: var(--color-primary); }
.figure--warm .figure__tint { background-color: var(--color-accent); }
.figure--deep .figure__tint { background-color: var(--color-contrast-surface); opacity: 0.58; }

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

.figure__caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-contrast-ink);
}

.figure--16x9 { aspect-ratio: 16 / 9; }
.figure--3x2  { aspect-ratio: 3 / 2; }
.figure--4x5  { aspect-ratio: 4 / 5; }
.figure--1x1  { aspect-ratio: 1 / 1; }
.figure--21x9 { aspect-ratio: 21 / 9; }

/* =========================================================
   12. 条目流与数字
   ========================================================= */
.entry-list { border-top: var(--border-thin) solid var(--color-line); }

.entry { border-bottom: var(--border-thin) solid var(--color-line); }

.entry__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  padding: var(--space-3) var(--space-2);
  margin-inline: calc(var(--space-2) * -1);
  transition: background-color 140ms linear, color 140ms linear;
}

.entry__row:hover {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.entry__row:hover .entry__meta,
.entry__row:hover .entry__desc {
  color: color-mix(in srgb, var(--color-primary-ink) 80%, var(--color-primary));
}

.entry__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.entry__desc {
  grid-column: 1 / -1;
  max-width: 62ch;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.entry__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.section--contrast .entry-list,
.section--contrast .entry { border-color: var(--color-contrast-line); }
.section--contrast .entry__desc { color: color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface)); }
.section--contrast .entry__meta { color: color-mix(in srgb, var(--color-contrast-ink) 58%, var(--color-contrast-surface)); }

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

.stat__value {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat__label {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.section--contrast .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 60%, var(--color-contrast-surface)); }

/* =========================================================
   13. 跳转链接
   ========================================================= */
.skip-link {
  position: fixed;
  top: -120px;
  left: var(--space-2);
  z-index: 200;
  padding: 11px 18px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  transition: top 120ms linear;
}

.skip-link:focus { top: var(--space-2); }

/* =========================================================
   14. 头部：框架式导航（桌面为左侧竖栏，移动为顶栏 + 抽屉）
   ========================================================= */
.site-header {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  z-index: 80;
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 10px var(--gutter);
}

.brand {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  min-width: 0;
}

.brand__mark {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 4px 7px;
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-radius: var(--radius-sm);
}

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--color-contrast-ink);
}

.quick-entry {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-sm);
  line-height: 1.2;
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background-color 140ms linear, color 140ms linear;
}

.quick-entry:hover {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  transition: background-color 140ms linear, color 140ms linear, border-color 140ms linear;
}

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

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background-color: currentColor;
}

.site-nav { display: none; }

.site-nav__list { display: flex; flex-direction: column; }

.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 12px var(--space-1);
  font-family: var(--font-heading);
  font-weight: 650;
  font-size: var(--text-base);
  line-height: 1.4;
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  transition: background-color 140ms linear, color 140ms linear;
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
  transition: color 140ms linear;
}

.site-nav__link:hover {
  background-color: color-mix(in srgb, var(--color-primary) 62%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
}

.site-nav__link:hover .site-nav__index { color: var(--color-primary-ink); }

.site-nav__link[aria-current="page"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.site-nav__link[aria-current="page"] .site-nav__index { color: var(--color-primary-ink); }

/* =========================================================
   15. 页脚：同色延续，靠 1px 细线与留白过渡
   ========================================================= */
.site-footer {
  background-color: var(--color-surface);
  color: var(--color-ink);
  padding-bottom: var(--space-8);
}

.site-footer__rule {
  height: var(--border-thin);
  background-color: var(--color-line);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-4);
  padding-top: var(--space-6);
}

.site-footer__top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
}

.site-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-ink);
  transition: color 140ms linear;
}

.site-footer__brand:hover { color: var(--color-primary); }

.site-footer__note {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.site-footer__nav {
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
  padding-block: var(--space-3);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  row-gap: var(--space-1);
}

.site-footer__links li {
  display: flex;
  align-items: center;
}

.site-footer__links li + li::before {
  content: "";
  width: var(--border-thin);
  height: 12px;
  margin-inline: var(--space-2);
  background-color: var(--color-line);
}

.site-footer__links a {
  display: inline-block;
  padding-block: 3px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 140ms linear, border-color 140ms linear;
}

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

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.site-footer__legal a {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 140ms linear, border-color 140ms linear;
}

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

.site-footer__sep {
  width: var(--border-thin);
  height: 12px;
  background-color: var(--color-line);
}

.site-footer__icp { font-family: var(--font-mono); letter-spacing: 0.02em; }
.site-footer__email { font-family: var(--font-mono); letter-spacing: 0.02em; }
.site-footer__copy { font-family: var(--font-mono); letter-spacing: 0.02em; }

/* =========================================================
   16. 滚动细线（由 site.js 注入）
   ========================================================= */
.scroll-rule {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-color: var(--color-accent);
  pointer-events: none;
  z-index: 90;
}

/* =========================================================
   17. 工具类
   ========================================================= */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* =========================================================
   18. 响应式
   ========================================================= */
@media (min-width: 1081px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail-w);
    display: flex;
    flex-direction: column;
  }

  .site-header__bar {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-3) var(--space-3);
    border-bottom: var(--border-thin) solid var(--color-contrast-line);
  }

  .nav-toggle { display: none; }

  .site-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-3);
    overflow-y: auto;
  }

  .site-nav__list { display: flex; flex-direction: column; }

  .site-nav__link {
    padding: 11px var(--space-2);
    border-bottom: 0;
  }

  .brand__name { font-size: var(--text-base); }
}

@media (max-width: 1080px) {
  .site-header {
    position: sticky;
    top: 0;
  }

  .site-header[data-open] .site-nav {
    display: block;
    padding: 0 var(--gutter) var(--space-3);
  }

  .site-nav__list {
    border-top: var(--border-thin) solid var(--color-contrast-line);
  }

  .quick-entry { font-size: var(--text-xs); padding: 5px 10px; }
}

@media (max-width: 860px) {
  .grid-10 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid-2 { grid-template-columns: minmax(0, 1fr); }
  .section { padding-block: var(--space-8); }
  .display { line-height: 0.98; }
}

@media (max-width: 560px) {
  .brand__name { font-size: 12px; }
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 8px 10px; }
  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }
  .site-footer__links li + li::before { margin-inline: var(--space-1); }
}

/* =========================================================
   19. 降低动态效果
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}