:root {
  --color-surface: #27262a;
  --color-surface-alt: #353439;
  --color-surface-deep: #47454b;
  --color-ink: #c6c3d0;
  --color-ink-soft: #9691a6;
  --color-ink-muted: #7a738c;
  --color-line: #444248;
  --color-primary: #7e63ca;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #332f40;
  --color-accent: #cbe619;
  --color-accent-ink: #131118;
  --color-highlight: #454927;
  --color-focus: #d5f30c;
  --color-contrast-surface: #f3f2f4;
  --color-contrast-ink: #343338;
  --color-contrast-line: #c9c8cb;
  --color-contrast-accent: #66730d;
  --overlay-scrim: linear-gradient(180deg, rgba(243, 242, 244, 0.35) 0%, rgba(243, 242, 244, 0.72) 55%, rgba(243, 242, 244, 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(54px, 11.2vw, 143px);
  --text-figure: clamp(45px, 8.0vw, 103px);
  --weight-heading: 639;
  --weight-body: 400;
  --leading-body: 1.74;
  --leading-heading: 1.29;
  --tracking-heading: 0.004em;
  --radius-sm: 10px;
  --radius-md: 10px;
  --radius-lg: 11px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 0 0 1px rgba(203, 230, 25, 0.35);
  --shadow-2: 0 0 28px rgba(203, 230, 25, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1280px;
  --measure: 73ch;
  --gutter: 16px;
  --section-y: 97px;
  --section-y-lg: 136px;
}

/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; }

html {
  --rail-w: 244px;
  background-color: var(--color-surface);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  min-height: 100vh;
  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);
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 84%, var(--color-primary-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: 0 0 var(--space-2); max-width: var(--measure); }
ul, ol { margin: 0 0 var(--space-2); padding-left: 1.25em; }
li { margin-bottom: 4px; }
img { max-width: 100%; }
strong { font-weight: 600; color: color-mix(in srgb, var(--color-ink) 82%, var(--color-primary-ink)); }
code, kbd, samp { font-family: var(--font-mono); font-size: 0.92em; color: var(--color-accent); }
hr { border: 0; height: var(--border-thin); background: var(--color-line); margin: var(--space-4) 0; }

a { color: inherit; text-decoration: none; }
a:hover { color: var(--color-accent); }

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

.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;
}

.skip-link {
  position: fixed; top: -120px; left: var(--space-2); z-index: 200;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: top 160ms ease;
}
.skip-link:focus { top: var(--space-2); color: var(--color-primary-ink); }

/* ===== 头部 ===== */
.site-header {
  position: fixed;
  z-index: 60;
  background-color: color-mix(in srgb, var(--color-surface) 94%, var(--color-accent-ink));
  color: var(--color-ink);
}

.site-header__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.brand__mark {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-ink) 88%, var(--color-primary-ink));
  white-space: nowrap;
}

.brand__rule {
  display: block;
  width: 36px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 12px color-mix(in srgb, var(--color-accent) 70%, transparent);
}

.brand__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  max-width: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.chip--mono {
  color: var(--color-accent);
  background: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 40%, transparent);
}

.chip--sync::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--color-accent) 80%, transparent);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.nav-toggle:hover { border-color: color-mix(in srgb, var(--color-accent) 50%, var(--color-line)); }
.nav-toggle[aria-expanded="true"] {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 65%, transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--color-accent) 28%, transparent);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: var(--radius-pill);
  background: currentColor;
}
.nav-toggle__bars span:nth-child(2) { width: 68%; }

.site-nav__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-1);
  counter-reset: navitem;
}

.site-nav__item { margin: 0; }

.site-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 46px;
  padding: 10px var(--space-2);
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid transparent;
  background: transparent;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.3;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-ink);
  background: var(--color-surface-deep);
  border-color: var(--color-line);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-primary-ink);
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--color-primary) 48%, transparent),
    color-mix(in srgb, var(--color-primary) 12%, transparent));
  border-color: color-mix(in srgb, var(--color-primary) 72%, transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--color-primary) 42%, transparent),
              inset 0 0 0 1px color-mix(in srgb, var(--color-accent) 22%, transparent);
}

.site-nav__idx {
  flex: 0 0 auto;
  min-width: 20px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--color-accent); }

.site-nav__label { flex: 1 1 auto; }

.site-nav__foot {
  margin: 0;
  max-width: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.site-nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px var(--space-2);
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
  background: var(--color-highlight);
  color: var(--color-accent);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: box-shadow 180ms ease, border-color 180ms ease;
}
.site-nav__cta:hover { color: var(--color-accent); border-color: var(--color-accent); box-shadow: var(--shadow-2); }

.to-top {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease;
}
.to-top:hover {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
}
.to-top__arrow { line-height: 1; }
.to-top__text { letter-spacing: 0.14em; }

.rail-progress {
  position: absolute;
  top: 0;
  right: 0;
  width: 2px;
  height: 100%;
  transform: scaleY(0);
  transform-origin: top center;
  background: linear-gradient(180deg, var(--color-accent), var(--color-primary));
  box-shadow: 0 0 14px color-mix(in srgb, var(--color-accent) 55%, transparent);
  pointer-events: none;
}

/* ===== 头部：桌面端侧边轨道 ===== */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail-w);
    border-right: var(--border-thin) solid var(--color-line);
    box-shadow: 0 0 26px color-mix(in srgb, var(--color-primary) 24%, transparent);
  }

  .site-header__inner {
    padding: var(--space-4) var(--space-3) var(--space-3);
    gap: var(--space-3);
  }

  .nav-toggle { display: none; }

  .site-nav {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    gap: var(--space-2);
    min-height: 0;
  }

  .site-nav__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
    flex: 1 1 auto;
    overflow-y: auto;
    padding-right: 2px;
  }
}

/* ===== 头部：移动端细条 + 贴底抽屉 ===== */
@media (max-width: 1023px) {
  body { padding-top: 58px; }

  .site-header {
    top: 0;
    left: 0;
    right: 0;
    height: 58px;
    display: flex;
    align-items: center;
    border-bottom: var(--border-thin) solid var(--color-line);
  }

  .site-header__inner {
    flex-direction: row;
    align-items: center;
    gap: var(--space-1);
    padding: 0 var(--space-2);
  }

  .brand { margin-right: auto; }
  .brand__mark { font-size: var(--text-base); letter-spacing: 0.1em; }
  .brand__rule { width: 20px; }
  .brand__meta { display: none; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    max-height: 80vh;
    overflow-y: auto;
    padding: var(--space-3) var(--space-2) var(--space-4);
    background: var(--color-surface-alt);
    border-top: var(--border-thick) solid color-mix(in srgb, var(--color-accent) 45%, var(--color-line));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    box-shadow: 0 -18px 40px color-mix(in srgb, var(--color-accent-ink) 55%, transparent);
    transform: translateY(102%);
    visibility: hidden;
    transition: transform 220ms ease, visibility 220ms ease;
  }

  .site-nav[data-open] {
    transform: translateY(0);
    visibility: visible;
  }

  .site-nav__title { letter-spacing: 0.2em; }
  .to-top, .rail-progress { display: none; }
}

/* ===== 页脚：反色区块 ===== */
.site-footer {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-8) 0 var(--space-4);
  border-top: var(--border-thick) solid var(--color-contrast-ink);
}

.site-footer__inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-3);
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 900px) {
  .site-footer__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 2fr);
    gap: var(--space-8);
  }
}

.site-footer__mark {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  letter-spacing: 0.12em;
  color: var(--color-contrast-ink);
}

.site-footer__tag {
  margin: 0;
  max-width: 36ch;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface));
}

.site-footer__cols {
  counter-reset: fcol;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .site-footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-3); }
}

.footer-col {
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-top: var(--space-2);
}

.footer-col__title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, var(--color-contrast-surface));
}

.footer-col__title::before {
  counter-increment: fcol;
  content: counter(fcol, decimal-leading-zero);
  color: var(--color-contrast-accent);
  letter-spacing: 0.06em;
}

.footer-col__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-col__list li { margin: 0; }

.footer-col__list a {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}
.footer-col__list a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.site-footer__contact {
  grid-column: 1 / -1;
  display: grid;
  gap: 8px;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-top: var(--space-3);
}

.contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px var(--space-2);
  margin: 0;
  max-width: none;
}

.contact-line__key {
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

.contact-line__val {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.site-footer__note {
  grid-column: 1 / -1;
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-xs);
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, var(--color-contrast-surface));
}

.site-footer__legal {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px var(--space-3);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface));
}

.site-footer__icp { color: var(--color-contrast-accent); }

/* ===== 通用布局 ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.section { padding: var(--section-y) 0; }
.section--tight { padding: var(--space-6) 0; }

@media (min-width: 1024px) {
  .section { padding: var(--section-y-lg) 0; }
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gutter);
}

@media (min-width: 768px) {
  .grid { grid-template-columns: repeat(8, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .grid { grid-template-columns: repeat(12, minmax(0, 1fr)); }
}

.span-3, .span-4, .span-6, .span-8, .span-12 { grid-column: 1 / -1; }

@media (min-width: 768px) {
  .span-3 { grid-column: span 4; }
  .span-4 { grid-column: span 8; }
  .span-6 { grid-column: span 4; }
}

@media (min-width: 1024px) {
  .span-3 { grid-column: span 3; }
  .span-4 { grid-column: span 4; }
  .span-6 { grid-column: span 6; }
  .span-8 { grid-column: span 8; }
}

/* ===== 面板与分隔语言 ===== */
.panel {
  position: relative;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 18%, transparent),
              0 0 22px color-mix(in srgb, var(--color-primary) 12%, transparent);
  transition: border-color 220ms ease, box-shadow 220ms ease;
}

.panel:hover {
  border-color: color-mix(in srgb, var(--color-accent) 50%, var(--color-line));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-accent) 24%, transparent),
              0 0 28px color-mix(in srgb, var(--color-accent) 18%, transparent);
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
  padding-bottom: 8px;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.panel__title { margin: 0; font-size: var(--text-lg); }

.panel__meta {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--color-accent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--color-accent) 70%, transparent);
}

.rule-scale {
  height: 11px;
  border-radius: 0;
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 10px);
  background-repeat: repeat-x;
}

.rule-scale--accent {
  background-image: repeating-linear-gradient(90deg, color-mix(in srgb, var(--color-accent) 65%, transparent) 0 1px, transparent 1px 10px);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.btn:hover {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--color-accent) 28%, transparent);
}

.btn--primary {
  background: var(--color-primary);
  border-color: color-mix(in srgb, var(--color-primary) 65%, var(--color-primary-ink));
  color: var(--color-primary-ink);
  box-shadow: 0 0 18px color-mix(in srgb, var(--color-primary) 45%, transparent);
}

.btn--primary:hover {
  color: var(--color-primary-ink);
  border-color: var(--color-accent);
  box-shadow: 0 0 26px color-mix(in srgb, var(--color-accent) 38%, transparent);
}

.btn--ghost { background: transparent; }

/* ===== 面包屑 ===== */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 var(--space-3);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.breadcrumbs li { margin: 0; }

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-line);
}

.breadcrumbs a { color: var(--color-ink-soft); }
.breadcrumbs a:hover { color: var(--color-accent); }
.breadcrumbs [aria-current="page"] { color: var(--color-ink); }

/* ===== 正文 ===== */
.prose { max-width: var(--measure); }
.prose > :first-child { margin-top: 0; }
.prose p { margin-bottom: var(--space-3); }
.prose h2, .prose h3 { margin-top: var(--space-6); }
.prose ul, .prose ol { margin-bottom: var(--space-3); }
.prose > * + h2 { margin-top: var(--space-6); }

/* ===== 数据组件 ===== */
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat__value {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 500;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--color-accent);
  text-shadow: 0 0 26px color-mix(in srgb, var(--color-accent) 35%, transparent);
}

.stat__unit {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
  text-shadow: none;
}

.stat__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 35%, transparent);
  background: var(--color-highlight);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

/* ===== 图片容器 ===== */
.figure { margin: 0; }

.figure__media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  box-shadow: 0 0 22px color-mix(in srgb, var(--color-primary) 16%, transparent);
}

.figure__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure--std .figure__media { aspect-ratio: 3 / 2; }
.figure--tall .figure__media { aspect-ratio: 4 / 5; }
.figure--wide .figure__media { aspect-ratio: 16 / 9; }

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

.figure__cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ===== 章节目录 ===== */
.toc {
  position: sticky;
  top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc__link {
  display: flex;
  gap: 10px;
  padding: 6px 0 6px 10px;
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  transition: color 160ms ease, border-color 160ms ease;
}

.toc__link:hover { color: var(--color-ink); }

.toc__link.is-active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  box-shadow: -1px 0 12px color-mix(in srgb, var(--color-accent) 35%, transparent);
}

/* ===== 进入动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  html[data-reveal="on"] .reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 220ms ease, transform 220ms ease;
  }
  html[data-reveal="on"] .reveal.is-in {
    opacity: 1;
    transform: none;
  }
}

/* ===== 降级与无障碍 ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
}