:root {
  --color-surface: #fdfdfd;
  --color-surface-alt: #f4f4f4;
  --color-surface-deep: #e7e8e7;
  --color-ink: #424d48;
  --color-ink-soft: #64726b;
  --color-ink-muted: #798680;
  --color-line: #dbdddc;
  --color-primary: #34845e;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e1ece7;
  --color-accent: #188620;
  --color-accent-ink: #ffffff;
  --color-highlight: #d4e8d5;
  --color-focus: #0f8518;
  --color-contrast-surface: #121b17;
  --color-contrast-ink: #e4e7e6;
  --color-contrast-line: #404845;
  --color-contrast-accent: #26d934;
  --overlay-scrim: linear-gradient(180deg, rgba(18, 27, 23, 0.35) 0%, rgba(18, 27, 23, 0.72) 55%, rgba(18, 27, 23, 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(34px, 6.2vw, 79px);
  --text-figure: clamp(28px, 4.5vw, 57px);
  --weight-heading: 800;
  --weight-body: 400;
  --leading-body: 1.7;
  --leading-heading: 1.21;
  --tracking-heading: 0.003em;
  --radius-sm: 14px;
  --radius-md: 14px;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(66, 77, 72, 0.08);
  --shadow-2: 0 18px 44px rgba(66, 77, 72, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1220px;
  --measure: 67ch;
  --gutter: 16px;
  --section-y: 105px;
  --section-y-lg: 147px;
}

/* =========================================================
   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, p, ul, ol, li, figure, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }
img, picture, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; border-spacing: 0; }

/* =========================================================
   2. Base typography
   ========================================================= */
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);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.lede {
  font-size: var(--text-lg);
  line-height: 1.55;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.measure-sm { max-width: 34ch; }

.rule {
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  margin-block: var(--space-3);
}

.section--contrast .rule { border-top-color: var(--color-contrast-line); }

.prose { max-width: var(--measure); }
.prose h2 { font-size: var(--text-2xl); margin-bottom: var(--space-2); }
.prose h3 { font-size: var(--text-xl); margin-top: var(--space-4); margin-bottom: var(--space-1); }
.prose p + p { margin-top: var(--space-2); }
.prose ul { display: grid; gap: var(--space-1); margin-top: var(--space-2); }
.prose ul li { position: relative; padding-left: 20px; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 10px;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
}

/* =========================================================
   3. Layout
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.container--narrow { max-width: 860px; }

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }
.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 { color: var(--color-contrast-ink); }
.section--contrast .eyebrow { color: var(--color-contrast-accent); }

/* 关键视觉区：三段柔和渐变 + 低透明度叠压层 */
.zone-gradient {
  position: relative;
  isolation: isolate;
  background-image: linear-gradient(135deg,
    var(--color-primary-soft) 0%,
    var(--color-highlight) 46%,
    var(--color-surface) 100%);
}
.zone-gradient::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(120% 86% at 88% -12%,
      color-mix(in srgb, var(--color-primary) 16%, transparent) 0%,
      transparent 62%),
    radial-gradient(90% 70% at 6% 108%,
      color-mix(in srgb, var(--color-primary) 8%, transparent) 0%,
      transparent 60%);
}
.zone-gradient > * { position: relative; z-index: 1; }

/* 斜切色块：打破水平线的轮次标记 */
.slant {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 16px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}
.section--contrast .slant { background-color: var(--color-contrast-accent); color: var(--color-contrast-surface); }

.grid { display: grid; gap: var(--space-3); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--5-7 { grid-template-columns: 5fr 7fr; gap: var(--space-6); }
.grid--aside { grid-template-columns: minmax(0, 1fr) 320px; gap: var(--space-6); }

/* =========================================================
   4. Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 22px;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid transparent;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.4;
  transition: background-color 180ms ease-out, color 180ms ease-out,
              border-color 180ms ease-out, box-shadow 180ms ease-out,
              transform 180ms ease-out;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 84%, #000); }

.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%, #000); }

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

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

/* =========================================================
   5. Breadcrumb
   ========================================================= */
.breadcrumb {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  padding-block: var(--space-2);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.breadcrumb li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--color-line);
}
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb [aria-current="page"] { color: var(--color-ink); font-weight: 600; }

/* =========================================================
   6. Skip link
   ========================================================= */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -120px;
  z-index: 120;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: top 180ms ease-out;
}
.skip-link:focus { top: var(--space-2); }

/* =========================================================
   7. Header
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: color-mix(in srgb, var(--color-surface) 94%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: box-shadow 200ms ease-out;
}
.site-header[data-condensed] { box-shadow: var(--shadow-1); }
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(135deg,
    color-mix(in srgb, var(--color-primary-soft) 78%, transparent) 0%,
    color-mix(in srgb, var(--color-highlight) 46%, transparent) 44%,
    transparent 100%);
}
.site-header > * { position: relative; z-index: 1; }

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 74px;
  padding-block: var(--space-2);
  transition: min-height 200ms ease-out, padding 200ms ease-out;
}
.site-header[data-condensed] .header-inner {
  min-height: 58px;
  padding-block: var(--space-1);
}
.site-header[data-condensed] .header-index { display: none; }

/* 品牌 */
.brand { display: inline-flex; align-items: center; gap: 10px; order: 1; }
.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border-radius: var(--radius-sm);
  background-image: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}
.brand__line {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

/* 本轮状态 */
.round-status {
  order: 3;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.round-status__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent);
}
.round-status__meta {
  padding-left: 10px;
  border-left: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 26%, transparent);
  color: var(--color-ink-soft);
  font-weight: 500;
}
.status-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
  animation: status-pulse 2.4s ease-out infinite;
}
@keyframes status-pulse {
  0%, 100% { box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 20%, transparent); }
  50% { box-shadow: 0 0 0 8px color-mix(in srgb, var(--color-accent) 5%, transparent); }
}

/* 导航 */
.site-nav { order: 2; flex: 1 1 auto; }
.nav-list { display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-ink-soft);
  transition: color 180ms ease-out, background-color 180ms ease-out;
}
.nav-link:hover {
  color: var(--color-primary);
  background-color: color-mix(in srgb, var(--color-primary-soft) 72%, transparent);
}
.nav-link[aria-current="page"] {
  color: var(--color-ink);
  font-weight: 700;
}
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 14px;
  height: 3px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
}
.nav-link[aria-current="page"]:hover { background-color: transparent; }

/* 移动导航按钮 */
.nav-toggle {
  order: 3;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: currentColor;
  transition: transform 200ms ease-out, opacity 200ms ease-out;
}
.site-header[data-open] .nav-toggle {
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 索引行 */
.header-index {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-block: 10px;
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
}
.header-index__label {
  flex: 0 0 auto;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.header-index__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  overflow-x: auto;
  scrollbar-width: none;
}
.header-index__list::-webkit-scrollbar { display: none; }
.header-index__list a {
  white-space: nowrap;
  color: var(--color-ink-soft);
  letter-spacing: 0.06em;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}
.header-index__list a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

/* =========================================================
   8. Footer
   ========================================================= */
.site-footer {
  position: relative;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.site-footer::before {
  content: "";
  display: block;
  height: 6px;
  background-image: linear-gradient(90deg,
    var(--color-primary-soft) 0%,
    var(--color-highlight) 46%,
    var(--color-surface) 100%);
}
.footer-inner { padding-block: var(--space-8) var(--space-4); }

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}
.footer-brand__line {
  margin-top: 4px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}
.footer-note {
  margin-top: var(--space-2);
  max-width: 46ch;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
  padding-block: var(--space-4);
}
.footer-col__title {
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}
.footer-list li + li { margin-top: var(--space-1); }
.footer-list a {
  display: inline-block;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}
.footer-list a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}
.footer-text {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}
.footer-text + .footer-text { margin-top: var(--space-1); }
.footer-text .mono { color: var(--color-contrast-ink); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer-icp { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

/* 回到顶部 */
.to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 55;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 200ms ease-out, transform 200ms ease-out, visibility 200ms ease-out;
}
.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top:hover { color: var(--color-contrast-accent); }

/* =========================================================
   9. Shared components
   ========================================================= */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  padding: var(--space-3);
}
.card--flat {
  box-shadow: none;
  border: var(--border-thin) solid var(--color-line);
}
.card--raise { box-shadow: var(--shadow-2); }
.card__title {
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.3;
}
.card__meta {
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.section--contrast .card {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, var(--color-contrast-surface));
  box-shadow: none;
  border: var(--border-thin) solid var(--color-contrast-line);
}
.section--contrast .card__meta { color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.tag--stoppage { background-color: var(--color-highlight); color: var(--color-ink); }
.tag--live { background-color: var(--color-accent); color: var(--color-accent-ink); }
.tag--contrast {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 14%, transparent);
  color: var(--color-contrast-ink);
}

.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}
.stat__label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.stat--accent .stat__num { color: var(--color-accent); }
.section--contrast .stat__num { color: var(--color-contrast-ink); }
.section--contrast .stat--accent .stat__num { color: var(--color-contrast-accent); }
.section--contrast .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

/* 图片容器：展签式说明 + 图片上文字必叠 scrim */
.figure {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface-deep);
}
.figure__media {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.figure--overlay .figure__scrim {
  position: absolute;
  inset: 0;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}
.figure__caption {
  position: relative;
  padding: var(--space-2) 0 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: 34ch;
}
.plate {
  position: absolute;
  left: var(--space-2);
  bottom: var(--space-2);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  background-color: color-mix(in srgb, var(--color-surface-deep) 88%, transparent);
  color: var(--color-ink);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.plate--tr { left: auto; right: var(--space-2); top: var(--space-2); bottom: auto; }
.plate--contrast {
  background-color: color-mix(in srgb, var(--color-contrast-surface) 82%, transparent);
  color: var(--color-contrast-ink);
}

/* 可展开内容组 */
.disclosure {
  border-top: var(--border-thin) solid var(--color-line);
  padding-block: 2px;
}
.disclosure__toggle {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  text-align: left;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-ink);
  transition: color 180ms ease-out;
}
.disclosure__toggle:hover { color: var(--color-primary); }
.disclosure__title { display: inline-flex; align-items: center; gap: 10px; }
.disclosure__title::before {
  content: "";
  width: 14px;
  height: 3px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
  opacity: 0;
  transform: scaleX(0.35);
  transform-origin: 0 50%;
  transition: opacity 200ms ease-out, transform 200ms ease-out;
}
.disclosure[data-open] .disclosure__title::before { opacity: 1; transform: none; }
.disclosure__toggle::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-ink-muted);
}
.disclosure[data-open] .disclosure__toggle::after { content: "–"; color: var(--color-accent); }
.disclosure__panel {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 240ms ease-out, opacity 240ms ease-out;
}
.disclosure[data-open] .disclosure__panel { max-height: 46rem; opacity: 1; }
.disclosure__body {
  padding-bottom: var(--space-2);
  max-width: var(--measure);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
}
.disclosure:last-of-type { border-bottom: var(--border-thin) solid var(--color-line); }

/* 时间轴 */
.timeline {
  position: relative;
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
}
.timeline__item {
  position: relative;
  padding-block: var(--space-2);
}
.timeline__item + .timeline__item { border-top: var(--border-thin) solid var(--color-line); }
.timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-3) - 5px);
  top: calc(var(--space-2) + 6px);
  width: 9px;
  height: 9px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  border: 2px solid var(--color-primary);
}
.timeline__item[data-state="live"]::before {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-accent) 16%, transparent);
}
.section--contrast .timeline { border-left-color: var(--color-contrast-line); }
.section--contrast .timeline__item + .timeline__item { border-top-color: var(--color-contrast-line); }

/* 对照表 */
.compare-wrap {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
}
.compare {
  width: 100%;
  min-width: 560px;
  font-size: var(--text-sm);
}
.compare th,
.compare td {
  padding: 14px var(--space-2);
  text-align: left;
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: top;
}
.compare thead th {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  white-space: nowrap;
}
.compare tbody tr:nth-child(even) { background-color: var(--color-surface-alt); }
.compare tbody th { font-weight: 700; color: var(--color-ink); }
.compare .mono { font-size: var(--text-base); font-weight: 700; color: var(--color-ink); }
.compare .is-accent .mono,
.compare .is-accent { color: var(--color-accent); }

/* 索引列表与旁注 */
.index-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
}
.index-list a {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}
.index-list a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

.aside-note {
  max-width: 34ch;
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}
.section--contrast .aside-note {
  border-left-color: var(--color-contrast-line);
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

/* 区块开头 */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.section-head__title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
}
.section-head__note {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: 34ch;
}
.section--contrast .section-head { border-bottom-color: var(--color-contrast-line); }
.section--contrast .section-head__note { color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }

/* =========================================================
   10. Responsive
   ========================================================= */
@media (max-width: 1100px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--aside { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  :root { --section-y: 72px; --section-y-lg: 96px; }

  .header-inner {
    flex-wrap: wrap;
    row-gap: var(--space-1);
    min-height: 64px;
  }
  .brand { order: 1; }
  .round-status { order: 2; margin-left: 0; }
  .nav-toggle { order: 3; margin-left: auto; display: inline-flex; }
  .site-nav {
    order: 4;
    flex: 1 1 100%;
    display: none;
    padding-bottom: var(--space-1);
    border-top: var(--border-thin) solid var(--color-line);
  }
  .site-header[data-open] .site-nav { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; padding-top: var(--space-1); }
  .nav-list li + li { border-top: var(--border-thin) solid var(--color-line); }
  .nav-link {
    width: 100%;
    padding: 12px 0;
    border-radius: 0;
    font-size: var(--text-base);
  }
  .nav-link:hover { background-color: transparent; }
  .nav-link[aria-current="page"] { padding-left: 22px; }
  .nav-link[aria-current="page"]::after {
    left: 0;
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
  }

  .header-index { padding-block: var(--space-1); }
  .header-index__list { flex-wrap: nowrap; }

  .grid--5-7 { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .grid--2 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  .container { padding-inline: var(--space-2); }
  .round-status__meta { display: none; }
  .round-status { padding: 5px 10px; }
  .brand__mark { width: 32px; height: 32px; flex-basis: 32px; }
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
  .footer-top { flex-direction: column; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .card { padding: var(--space-2); }
  .to-top { right: var(--space-2); bottom: var(--space-2); }
}

/* =========================================================
   11. Motion preferences
   ========================================================= */
@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;
  }
  .zone-gradient::after { display: none; }
  .status-dot { animation: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 20%, transparent); }
  .to-top { transform: none; }
  .disclosure__panel { transition: none; }
}