/* ==========================================================================
   雷火电竞 · 乐鱼游艺出品 — 共享样式表 /assets/site.css
   气质：杂志拼贴混排 × 竞技数据面板
   要点：纸底、直角细边框、错位边界、衬线大字、等宽注释、色块只标记专题与数据
   ========================================================================== */

:root {
  --color-surface: #f6f6f6;
  --color-surface-alt: #eeeded;
  --color-surface-deep: #e2e1e1;
  --color-ink: #504445;
  --color-ink-soft: #786869;
  --color-ink-muted: #877878;
  --color-line: #d8d6d6;
  --color-primary: #bf4046;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #eedddd;
  --color-accent: #0b7ac1;
  --color-accent-ink: #ffffff;
  --color-highlight: #cce0ec;
  --color-focus: #0172bc;
  --color-contrast-surface: #160e0f;
  --color-contrast-ink: #e7e4e4;
  --color-contrast-line: #443d3e;
  --color-contrast-accent: #0e98f1;
  --overlay-scrim: linear-gradient(180deg, rgba(22, 14, 15, 0.35) 0%, rgba(22, 14, 15, 0.72) 55%, rgba(22, 14, 15, 0.92) 100%);
  --font-heading: "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 10.1px;
  --text-sm: 14.3px;
  --text-base: 17px;
  --text-lg: 24.0px;
  --text-xl: 34.0px;
  --text-2xl: 48.1px;
  --text-3xl: 68.0px;
  --text-4xl: 96.1px;
  --text-display: clamp(52px, 10.7vw, 137px);
  --text-figure: clamp(44px, 7.7vw, 99px);
  --weight-heading: 732;
  --weight-body: 400;
  --leading-body: 1.76;
  --leading-heading: 1.19;
  --tracking-heading: -0.013em;
  --radius-sm: 0px;
  --radius-md: 2px;
  --radius-lg: 3px;
  --radius-pill: 3px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 1px 0 rgba(80, 68, 69, 0.12);
  --shadow-2: 0 2px 0 rgba(80, 68, 69, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1280px;
  --measure: 69ch;
  --gutter: 16px;
  --section-y: 73px;
  --section-y-lg: 102px;
}

/* --------------------------------------------------------------------------
   1. Reset 与中文排版基准
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  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;
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

/* 衬线大标题做 2° 倾斜：杂志混排的签名动作 */
h1, h2 { transform: skewX(-2deg); }

p { margin: 0 0 var(--space-2); }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: var(--color-accent); }
button { font: inherit; color: inherit; }
table { width: 100%; border-collapse: collapse; }

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

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

#main-content { display: block; scroll-margin-top: 132px; }

/* --------------------------------------------------------------------------
   2. 容器与网格
   -------------------------------------------------------------------------- */
.shell,
.site-header__shell,
.site-footer__shell {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.grid--gap-lg { gap: var(--space-4); }
.grid--gap-y { row-gap: var(--space-6); }

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* --------------------------------------------------------------------------
   3. 跳至主要内容
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -72px;
  left: var(--space-2);
  z-index: 200;
  padding: 10px var(--space-2);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: top 120ms ease-out;
}
.skip-link:focus { top: var(--space-1); }

/* --------------------------------------------------------------------------
   4. 双层信息导航（头部）
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-1);
}

/* --- 4.1 上层：品牌说明行 --- */
.masthead {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  min-height: 60px;
  padding-block: var(--space-1);
}
/* 错位分隔：上层底部横线在右侧提前收边 */
.masthead::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: calc(100% - 88px);
  height: var(--border-thin);
  background-color: var(--color-line);
}

.masthead__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}
.masthead__brand::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 4px;
  background-color: var(--color-primary);
  transform: translateY(-1px);
}
.masthead__sep { color: var(--color-primary); font-family: var(--font-mono); }
.masthead__credit {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.quicknav { display: flex; align-items: center; }
.quicknav__list { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.quicknav__link {
  display: inline-block;
  padding: 4px 9px;
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: background-color 120ms ease-out, color 120ms ease-out, border-color 120ms ease-out;
}
.quicknav__link:hover,
.quicknav__link:focus-visible {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

/* --- 4.2 常驻状态面板（唯一的深色小块） --- */
.status-panel {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  max-width: 100%;
  padding: 5px 10px;
  background-color: var(--color-contrast-surface);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-contrast-ink);
}
.status-panel__cell {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
}
.status-panel__cell + .status-panel__cell {
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-contrast-line);
}
.status-panel__k { color: var(--color-ink-muted); }
.status-panel__v { color: var(--color-contrast-accent); }

/* --- 4.3 移动导航按钮 --- */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink);
  cursor: pointer;
}
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 10px; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform 120ms ease-out;
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.site-header[data-open] .nav-toggle {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(4px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-4px) rotate(-45deg); }
.site-header[data-open] .nav-toggle__bars::before,
.site-header[data-open] .nav-toggle__bars::after { background-color: var(--color-primary-ink); }

/* --- 4.4 下层：栏目行 --- */
.navbar { position: relative; }
.navbar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 88px;
  right: 0;
  height: var(--border-thin);
  background-color: var(--color-line);
}
.navbar::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 3px;
  background-color: var(--color-primary);
}

.primary-nav__list { display: flex; flex-wrap: wrap; }
.primary-nav__item + .primary-nav__item { border-left: var(--border-thin) solid var(--color-line); }
.primary-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 13px var(--space-3);
  border-bottom: 2px solid transparent;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-ink);
  text-decoration: none;
  transition: transform 120ms ease-out, color 120ms ease-out, border-color 120ms ease-out;
}
.primary-nav__link:hover,
.primary-nav__link:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  transform: translateX(2px);
}
.primary-nav__link[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-primary);
}
.primary-nav__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.primary-nav__link[aria-current="page"] .primary-nav__num { color: var(--color-primary); }

/* --- 4.5 阅读进度条 --- */
.scroll-meter {
  height: 2px;
  background-color: var(--color-surface-deep);
}
.scroll-meter__fill {
  display: block;
  width: 0;
  height: 100%;
  background-color: var(--color-primary);
  transition: width 120ms linear;
}

/* --------------------------------------------------------------------------
   5. 同色延续页脚（错位缩进）
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: var(--section-y-lg);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--border-thin);
  background-color: var(--color-line);
}
.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 104px;
  height: 3px;
  background-color: var(--color-primary);
}
.site-footer h2 { transform: none; }

.site-footer__shell { padding-block: var(--space-8) var(--space-6); }

.footer-row { position: relative; margin-top: var(--space-6); }
.footer-row + .footer-row {
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}
/* 每行起始缩进不同 —— 错位边界 */
.footer-row--a { margin-left: 0; width: 100%; }
.footer-row--b { margin-left: 4%; width: 96%; }
.footer-row--c { margin-left: 9%; width: 91%; }
.footer-row--d { margin-left: 2%; width: 98%; }

.footer-lede {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: var(--space-4) var(--space-6);
  align-items: end;
}
.footer-lede__text {
  max-width: 30ch;
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
.footer-lede__side { padding-bottom: 2px; }
.footer-lede__meta {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.footer-cta {
  display: inline-block;
  margin-top: var(--space-2);
  padding-bottom: 2px;
  border-bottom: 2px solid var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  text-decoration: none;
  transition: transform 120ms ease-out, color 120ms ease-out, border-color 120ms ease-out;
}
.footer-cta::after { content: " →"; color: var(--color-accent); }
.footer-cta:hover,
.footer-cta:focus-visible {
  transform: translateX(2px);
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.footer-row__label {
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}
.footer-row__list { display: flex; flex-wrap: wrap; gap: 6px var(--space-3); }
.footer-row__list--stack { flex-direction: column; gap: 4px; }
.footer-row__link {
  display: inline-block;
  border-bottom: 1px solid transparent;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: transform 120ms ease-out, color 120ms ease-out, border-color 120ms ease-out;
}
.footer-row__link:hover,
.footer-row__link:focus-visible {
  transform: translateX(2px);
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.footer-contact__item {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.footer-contact__val { color: var(--color-ink); letter-spacing: 0.02em; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-base__brand {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
}
.footer-base__sep { margin: 0 6px; font-family: var(--font-mono); color: var(--color-primary); }
.footer-base__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* --------------------------------------------------------------------------
   6. 返回顶部
   -------------------------------------------------------------------------- */
.to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background-color: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-ink);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 120ms ease-out, transform 120ms ease-out, visibility 120ms;
}
.to-top[data-visible="true"] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover,
.to-top:focus-visible {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.to-top__arrow { color: var(--color-contrast-accent); }
.to-top:hover .to-top__arrow { color: var(--color-primary-ink); }

/* --------------------------------------------------------------------------
   7. 段落节奏与题头
   -------------------------------------------------------------------------- */
.section { padding-block: var(--section-y); }
.section--tight { padding-block: var(--space-6); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }

.band--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.band--contrast h1,
.band--contrast h2,
.band--contrast h3 { color: var(--color-contrast-ink); }
.band--contrast .anno,
.band--contrast .eyebrow { color: var(--color-contrast-accent); }
.band--contrast .lead { color: var(--color-contrast-ink); }

.page-head {
  position: relative;
  padding-block: var(--space-6) var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.page-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 96px;
  height: 3px;
  background-color: var(--color-primary);
}
.page-head__meta {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.rule-offset {
  position: relative;
  height: var(--border-thin);
  margin: var(--space-6) 0;
  background-color: var(--color-line);
}
.rule-offset::after {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 72px;
  height: 3px;
  background-color: var(--color-primary);
}
.rule-offset--short {
  width: calc(100% - 96px);
  margin-left: 96px;
}

/* --------------------------------------------------------------------------
   8. 文字组件
   -------------------------------------------------------------------------- */
.display-title {
  font-size: var(--text-display);
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin: 0;
}
.title-xl { font-size: var(--text-3xl); margin: 0; }
.title-lg { font-size: var(--text-2xl); margin: 0; }
.title-md { font-size: var(--text-xl); margin: 0; }

.lead {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-primary);
}
.anno {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* --------------------------------------------------------------------------
   9. 数据组件（大数字只用 --text-figure）
   -------------------------------------------------------------------------- */
.kpi {
  padding-top: var(--space-2);
  border-top: 3px solid var(--color-primary);
}
.kpi__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.kpi__label {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.kpi--accent { border-top-color: var(--color-accent); }
.kpi--accent .kpi__num { color: var(--color-accent); }

@keyframes pulse-accent {
  0% { color: var(--color-accent); }
  50% { color: var(--color-primary); }
  100% { color: var(--color-accent); }
}
[data-pulse="true"] .kpi__num,
.kpi__num[data-pulse="true"] { animation: pulse-accent 400ms ease-out 1; }

.data-card {
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border-left: 3px solid var(--color-line);
}
.data-card--primary {
  background-color: var(--color-primary-soft);
  border-left-color: var(--color-primary);
}
.data-card__head {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.data-card__value {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1.1;
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   10. 标签、状态与按钮
   -------------------------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}
.tag--primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.tag--accent {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.state-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-accent);
}
.state-dot--live { background-color: var(--color-primary); }

.chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background-color 120ms ease-out, color 120ms ease-out, border-color 120ms ease-out;
}
.chip:hover,
.chip:focus-visible { border-color: var(--color-primary); color: var(--color-primary); }
.chip--on,
.chip[aria-pressed="true"] {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background-color: transparent;
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink);
  text-decoration: none;
  transition: transform 120ms ease-out, background-color 120ms ease-out, color 120ms ease-out, border-color 120ms ease-out;
}
.btn:hover,
.btn:focus-visible {
  transform: translateX(2px);
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.btn--primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.btn--line {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   11. 面包屑
   -------------------------------------------------------------------------- */
.crumbs {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
.crumbs__list { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.crumbs__item { display: inline-flex; align-items: center; gap: var(--space-1); }
.crumbs__item + .crumbs__item::before { content: "/"; color: var(--color-line); }
.crumbs__link {
  color: var(--color-ink-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.crumbs__link:hover,
.crumbs__link:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.crumbs__current { color: var(--color-ink); }

/* --------------------------------------------------------------------------
   12. 正文长文
   -------------------------------------------------------------------------- */
.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}
.prose > * + * { margin-top: var(--space-2); }
.prose h2 {
  margin-top: var(--space-6);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xl);
}
.prose h3 { margin-top: var(--space-4); font-size: var(--text-lg); }
.prose p, .prose li { color: var(--color-ink); }
.prose ul { list-style: none; }
.prose ul li { position: relative; margin-bottom: var(--space-1); padding-left: 22px; }
.prose ul li::before {
  content: "—";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  color: var(--color-primary);
}
.prose a { color: var(--color-accent); text-underline-offset: 3px; }
.prose blockquote {
  margin: var(--space-4) 0;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-primary-soft);
  border-left: 3px solid var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
}
.prose code {
  padding: 1px 5px;
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

/* --------------------------------------------------------------------------
   13. 章节目录
   -------------------------------------------------------------------------- */
.toc {
  position: sticky;
  top: 116px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}
.toc__label {
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}
.toc__list { display: flex; flex-direction: column; gap: 2px; border-left: var(--border-thin) solid var(--color-line); }
.toc__link {
  display: block;
  margin-left: -1px;
  padding: 6px 0 6px var(--space-2);
  border-left: 2px solid transparent;
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 120ms ease-out, border-color 120ms ease-out, background-color 120ms ease-out;
}
.toc__link:hover,
.toc__link:focus-visible { color: var(--color-primary); }
.toc__link[aria-current="true"] {
  color: var(--color-ink);
  border-left-color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

/* --------------------------------------------------------------------------
   14. 数据面板
   -------------------------------------------------------------------------- */
.panel {
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-md);
}
.panel--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.panel--contrast h2,
.panel--contrast h3 { color: var(--color-contrast-ink); }
.panel--contrast .anno,
.panel--contrast .eyebrow { color: var(--color-contrast-accent); }
.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.panel--contrast .panel__head { border-bottom-color: var(--color-contrast-line); }
.panel__body { min-width: 0; }

/* --------------------------------------------------------------------------
   15. 图片容器（页面阶段放图，圆角柔化 + 直角细框）
   -------------------------------------------------------------------------- */
.media {
  position: relative;
  margin: 0;
  background-color: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.media--placeholder {
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
}
.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
}
.media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}
.media__overlay {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}
.media__overlay .media__title {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}
.media__caption {
  margin: var(--space-1) 0 0;
  padding-left: 12px;
  border-left: 3px solid var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}
.media__tag {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  padding: 4px 9px;
  background-color: var(--color-primary);
  border-bottom-right-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary-ink);
}

/* --------------------------------------------------------------------------
   16. 图文咬合叠层
   -------------------------------------------------------------------------- */
.overlap {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
  align-items: end;
}
.overlap__media { position: relative; grid-column: 1 / span 8; }
.overlap__card {
  position: relative;
  z-index: 2;
  grid-column: 7 / span 6;
  margin-bottom: calc(var(--space-6) * -1);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  box-shadow: var(--shadow-2);
  border-radius: var(--radius-md);
}

/* --------------------------------------------------------------------------
   17. 显现与刻度（滚动驱动）
   -------------------------------------------------------------------------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 160ms ease-out, transform 160ms ease-out;
}
.js [data-reveal="in"] { opacity: 1; transform: none; }

[data-tick] {
  background-color: var(--color-surface-deep);
  transition: background-color 120ms ease-out;
}
[data-tick][data-lit="true"] { background-color: var(--color-primary); }

/* --------------------------------------------------------------------------
   18. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1180px) {
  .primary-nav__link { padding-inline: var(--space-2); }
  .masthead { gap: var(--space-1) var(--space-2); }
}

@media (max-width: 899px) {
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 12; }

  .status-panel { display: none; }
  .nav-toggle { display: inline-flex; }

  .navbar { display: none; }
  .site-header[data-open] .navbar {
    display: block;
    padding-bottom: var(--space-2);
    border-top: var(--border-thin) solid var(--color-line);
  }
  .site-header[data-open] .navbar::before,
  .site-header[data-open] .navbar::after { display: none; }

  .primary-nav__list { flex-direction: column; }
  .primary-nav__item + .primary-nav__item {
    border-left: 0;
    border-top: var(--border-thin) solid var(--color-line);
  }
  .primary-nav__link {
    width: 100%;
    padding: 12px var(--space-1);
    justify-content: flex-start;
  }

  .masthead::after { width: 100%; }

  .footer-lede { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
  .footer-row--b { margin-left: 2%; width: 98%; }
  .footer-row--c { margin-left: 5%; width: 95%; }
  .footer-row--d { margin-left: 0; width: 100%; }

  .overlap__media { grid-column: 1 / span 12; }
  .overlap__card { grid-column: 1 / span 12; margin-bottom: 0; margin-top: calc(var(--space-4) * -1); }

  .toc { position: static; top: auto; }
  .toc__list { flex-direction: row; flex-wrap: wrap; border-left: 0; }
  .toc__link { padding: 4px 8px; border-left: 0; border-bottom: 2px solid transparent; }
  .toc__link[aria-current="true"] { border-bottom-color: var(--color-primary); }
}

@media (max-width: 640px) {
  .masthead { min-height: 54px; }
  .masthead__brand { font-size: var(--text-lg); }
  .quicknav__list { gap: 6px; }
  .quicknav__link { padding: 3px 7px; }

  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }
  .site-footer { margin-top: var(--space-8); }
  .site-footer__shell { padding-block: var(--space-6) var(--space-4); }

  .footer-lede__text { font-size: var(--text-lg); }
  .footer-row__list { flex-direction: column; gap: 6px; }

  .page-head { padding-block: var(--space-4) var(--space-3); }
  .to-top { right: var(--space-2); bottom: var(--space-2); }
  .to-top__text { display: none; }
}

/* --------------------------------------------------------------------------
   19. 动效降级
   -------------------------------------------------------------------------- */
@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;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .to-top { transition: none; }
  .scroll-meter__fill { transition: none; }
}