:root {
  --color-surface: #eaeceb;
  --color-surface-alt: #e1e4e3;
  --color-surface-deep: #d5d8d7;
  --color-ink: #374342;
  --color-ink-soft: #596968;
  --color-ink-muted: #748685;
  --color-line: #cacecd;
  --color-primary: #328179;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #d0dddb;
  --color-accent: #c53aa1;
  --color-accent-ink: #ffffff;
  --color-highlight: #e3ccde;
  --color-focus: #b82893;
  --color-contrast-surface: #172322;
  --color-contrast-ink: #e4e7e7;
  --color-contrast-line: #444e4d;
  --color-contrast-accent: #cf5eb2;
  --overlay-scrim: linear-gradient(180deg, rgba(23, 35, 34, 0.35) 0%, rgba(23, 35, 34, 0.72) 55%, rgba(23, 35, 34, 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: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(38px, 7.9vw, 101px);
  --text-figure: clamp(32px, 5.7vw, 73px);
  --weight-heading: 674;
  --weight-body: 400;
  --leading-body: 1.77;
  --leading-heading: 1.21;
  --tracking-heading: -0.001em;
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(55, 67, 66, 0.12);
  --shadow-2: 0 2px 0 rgba(55, 67, 66, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 68ch;
  --gutter: 32px;
  --section-y: 118px;
  --section-y-lg: 165px;
}

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

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

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

ul, ol { padding: 0; }
nav ul, .site-nav__list { list-style: none; }

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover { color: color-mix(in srgb, var(--color-primary) 74%, var(--color-ink)); }

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

/* ==========================================================================
   2. 基础排版 · 无衬线标题 + 宋体正文
   ========================================================================== */
body {
  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;
}

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: 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); }

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

/* 宋体正文承担长文阅读，形成中西混排 */
.prose,
.prose p,
.prose li,
.lede,
.quote-block__text {
  font-family: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", "SimSun", serif;
}

.lede {
  font-size: var(--text-lg);
  line-height: 1.66;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.prose {
  max-width: var(--measure);
  color: var(--color-ink);
}
.prose h2,
.prose h3,
.prose h4 { font-family: var(--font-heading); margin-bottom: var(--space-2); margin-top: var(--space-4); }
.prose ul,
.prose ol { padding-left: 1.4em; margin-bottom: var(--space-2); }
.prose li { margin-bottom: var(--space-1); }

.num,
[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* 展示级字号：仅首屏主标题与大数字 */
.hero-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.98;
  letter-spacing: -0.02em;
}
.figure-value {
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.02em;
}

/* ==========================================================================
   3. 布局骨架
   ========================================================================== */
.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); }

.section--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-block: var(--border-thin) dashed var(--color-contrast-line);
}
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4 { color: var(--color-contrast-ink); }
.section--contrast .lede {
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, var(--color-contrast-surface));
}
.section--contrast .rule { border-top-color: var(--color-contrast-line); }

.grid { display: grid; gap: var(--space-4); }
.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)); }
.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-12 { grid-column: span 12; }

/* ==========================================================================
   4. 分隔语言 · 点线与虚线
   ========================================================================== */
.rule {
  height: 0;
  border: 0;
  border-top: var(--border-thin) dashed var(--color-line);
  margin-block: var(--space-4);
}
.rule--dotted { border-top-style: dotted; }
.rule--solid { border-top-style: solid; }

/* ==========================================================================
   5. 跳至主要内容
   ========================================================================== */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -120px;
  z-index: 300;
  padding: 10px 16px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top 0.18s ease;
}
.skip-link:focus {
  top: var(--space-2);
  color: var(--color-primary-ink);
  outline-color: var(--color-primary-ink);
}

/* ==========================================================================
   6. 站点头部 · 左右分置 + 斜向标签
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) dashed var(--color-line);
  transition: background-color 0.24s ease;
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: var(--border-thick);
  background-color: var(--color-primary);
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: 0 50%;
  pointer-events: none;
  transition: transform 0.12s linear;
}

.site-header__inner {
  position: relative;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  transition: padding 0.24s ease;
}

.site-header.is-condensed .site-header__inner { padding-block: var(--space-1); }
.site-header.is-condensed .site-brand__mark { width: 28px; height: 28px; font-size: var(--text-base); }
.site-header.is-condensed .site-nav__link { padding-block: 5px 8px; }

/* —— 栏目标签 —— */
.site-nav { order: 1; min-width: 0; }
.site-nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  margin: 0;
}
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 13px 10px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-ink-soft);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease;
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: var(--border-thick);
  background-color: var(--color-accent);
  transform: skewX(-24deg) scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s ease;
}
.site-nav__link:hover {
  color: var(--color-ink);
  background-color: var(--color-surface-alt);
}
.site-nav__link:hover::after { transform: skewX(-24deg) scaleX(1); }

.site-nav__link[aria-current="page"] {
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}
.site-nav__link[aria-current="page"]::after { transform: skewX(-24deg) scaleX(1); }

/* —— 品牌署名 —— */
.site-brand {
  order: 2;
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}
.site-brand__mark {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
  transition: width 0.24s ease, height 0.24s ease, font-size 0.24s ease;
}
.site-brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.site-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-ink);
  white-space: nowrap;
}
.site-brand__name:hover { color: var(--color-primary); }
.site-brand__sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

/* —— 移动导航按钮 —— */
.nav-toggle {
  order: 3;
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 9px 12px;
  background-color: var(--color-surface-alt);
  border: var(--border-thin) dashed var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: var(--border-thick);
  border-radius: var(--radius-pill);
  background-color: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ==========================================================================
   7. 站点页脚 · 极简单行
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: var(--section-y);
  background-color: var(--color-surface-alt);
  border-top: var(--border-thin) dashed var(--color-line);
}
.site-footer__inner {
  position: relative;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
}
.site-footer__inner::before {
  content: "";
  position: absolute;
  left: var(--gutter);
  top: -1px;
  width: 56px;
  height: var(--border-thick);
  background-color: var(--color-primary);
}
.site-footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
}
.site-footer__name {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  white-space: nowrap;
}
.site-footer__links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  margin-inline: auto;
}
.site-footer__links a {
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  transition: color 0.2s ease, background-color 0.2s ease;
}
.site-footer__links a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}
.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px var(--space-2);
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.site-footer__closing { margin: 0; }
.site-footer__legal { margin: 0; }

/* ==========================================================================
   8. 通用组件
   ========================================================================== */
/* —— 按钮 —— */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 18px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.2;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s 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-ink)); color: var(--color-primary-ink); }
.btn--ghost {
  background-color: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
  border-style: dashed;
}
.btn--ghost:hover { color: var(--color-primary); border-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); }

/* —— 面包屑 —— */
.crumbs {
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.crumbs a { color: var(--color-ink-soft); }
.crumbs a:hover { color: var(--color-primary); }
.crumbs__sep { color: var(--color-line); }
.crumbs [aria-current="page"] { color: var(--color-ink); }

/* —— 页面标题区 —— */
.page-head {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-8) var(--gutter) var(--space-4);
}
.page-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.page-head__eyebrow::before {
  content: "";
  width: 22px;
  height: var(--border-thick);
  background-color: var(--color-accent);
  transform: skewX(-24deg);
}
.page-head__title { font-size: var(--text-3xl); }
.page-head__lede { margin-top: var(--space-2); }

/* —— 小标注 —— */
.mark-vertical {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  color: var(--color-primary);
  padding-inline: 2px;
  user-select: none;
}
.mark-rot {
  display: inline-block;
  transform: rotate(-6deg);
  padding: 2px 9px;
  background-color: var(--color-primary-soft);
  border: var(--border-thin) dashed color-mix(in srgb, var(--color-primary) 42%, transparent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.section--contrast .mark-rot {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 22%, transparent);
  border-color: color-mix(in srgb, var(--color-contrast-accent) 52%, transparent);
  color: var(--color-contrast-accent);
}

/* —— 标签 —— */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 26%, transparent);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: color-mix(in srgb, var(--color-primary) 84%, var(--color-ink));
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
}
.badge--accent { background-color: var(--color-accent); color: var(--color-accent-ink); border-color: transparent; }
.badge--highlight { background-color: var(--color-highlight); color: var(--color-ink); border-color: transparent; }
.section--contrast .badge {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 20%, transparent);
  border-color: color-mix(in srgb, var(--color-contrast-accent) 48%, transparent);
  color: var(--color-contrast-ink);
}

/* —— 引号与缩进强调 —— */
.quote-block {
  position: relative;
  margin: 0;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-6);
  background-color: var(--color-highlight);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.quote-block::before {
  content: "\201C";
  position: absolute;
  left: var(--space-2);
  top: 4px;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  line-height: 1;
  color: color-mix(in srgb, var(--color-primary) 66%, var(--color-ink));
}
.quote-block__text {
  font-size: var(--text-lg);
  line-height: 1.62;
  color: var(--color-ink);
}
.quote-block__cite {
  display: block;
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

/* —— 数据摘要条 —— */
.data-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-surface-deep);
  border: var(--border-thin) dashed var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}
.data-strip:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
}
.data-strip__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}
.data-strip__value {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}
.data-strip__delta {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
}
.data-strip__go {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}
.section--contrast .data-strip {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, var(--color-contrast-surface));
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.section--contrast .data-strip:hover {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 14%, var(--color-contrast-surface));
}
.section--contrast .data-strip__key { color: color-mix(in srgb, var(--color-contrast-ink) 60%, var(--color-contrast-surface)); }
.section--contrast .data-strip__value { color: var(--color-contrast-ink); }
.section--contrast .data-strip__delta { color: var(--color-contrast-accent); }
.section--contrast .data-strip__go { color: var(--color-contrast-accent); }

/* —— 数据磁贴 —— */
.tile-rack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: var(--space-2);
  align-items: start;
}
.tile {
  position: relative;
  padding: var(--space-2) var(--space-3) var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-md);
  cursor: grab;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}
.tile::after {
  content: "";
  position: absolute;
  top: 9px;
  right: 9px;
  width: 12px;
  height: 12px;
  background-image: radial-gradient(var(--color-line) 1px, transparent 1px);
  background-size: 4px 4px;
  pointer-events: none;
}
.tile:hover { border-color: color-mix(in srgb, var(--color-primary) 52%, var(--color-line)); }
.tile.is-dragging { opacity: 0.45; cursor: grabbing; }
.tile__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.tile__value {
  margin-top: 4px;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--color-ink);
}
.tile__note {
  margin-top: 6px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.tile__delta {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
}

/* —— 图片容器 —— */
.figure-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
}
.figure-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.4) contrast(1.08) sepia(0.14);
}
.figure-frame--tall { aspect-ratio: 3 / 4; }
.figure-frame--wide { aspect-ratio: 21 / 9; }
.figure-frame--tint::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--color-primary);
  mix-blend-mode: color;
  opacity: 0.24;
  pointer-events: none;
}
.figure-frame__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.figure-frame__caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 2;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
}
.figure-frame__tag {
  position: absolute;
  left: var(--space-3);
  top: var(--space-3);
  z-index: 2;
}

/* —— 滚动显现 —— */
.reveal { transition: opacity 0.24s ease, transform 0.24s ease; }

/* ==========================================================================
   9. 响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .site-nav__link { padding-inline: 10px; font-size: var(--text-xs); }
}

@media (max-width: 900px) {
  :root { --gutter: 24px; }

  .site-header__inner { flex-wrap: nowrap; }
  .nav-toggle { display: inline-flex; order: 3; }
  .site-brand { order: 2; margin-left: 0; }
  .site-nav { order: 1; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(84vw, 330px);
    padding: 96px var(--space-3) var(--space-4);
    background-color: var(--color-surface);
    border-left: var(--border-thin) dashed var(--color-line);
    overflow-y: auto;
    transform: translateX(102%);
    transition: transform 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
    z-index: 90;
  }
  .site-nav[data-open] { transform: translateX(0); }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .site-nav__link {
    display: block;
    padding: 12px 14px;
    font-size: var(--text-base);
  }
  .site-nav__link::after { left: 14px; right: auto; width: 28px; bottom: 8px; }

  body.nav-open { overflow: hidden; }

  .site-brand__sub { letter-spacing: 0.08em; }

  .grid--2, .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }
  .page-head { padding-top: var(--space-6); }
}

@media (max-width: 620px) {
  :root { --gutter: 16px; }

  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .section { padding-block: var(--space-8); }
  .section--lg { padding-block: var(--space-8); }
  .page-head__title { font-size: var(--text-2xl); }

  .site-brand__mark { width: 30px; height: 30px; font-size: var(--text-base); }
  .site-brand__name { font-size: var(--text-xs); }
  .site-brand__sub { display: none; }
  .nav-toggle__label { display: none; }

  .site-footer__inner { flex-direction: column; align-items: flex-start; gap: var(--space-2); }
  .site-footer__links { margin-inline: 0; }
  .figure-frame { aspect-ratio: 4 / 3; }
}

/* ==========================================================================
   10. 降低动效
   ========================================================================== */
@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;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
  .site-header::after { transition: none; }
}