/* ============================================================
   MG游戏站 · 共享样式 / assets/site.css
   夜间控制台手册：深海墨蓝底 + 电光青索引 + 琥珀金行动
   ============================================================ */

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

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

body { margin: 0; }

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

ul, ol { padding: 0; }

ul[class], ol[class] {
  list-style: none;
  padding-left: 0;
}

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

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

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

:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink-950: #061826;
  --ink-900: #081E2E;
  --ink-850: #0A2233;
  --ink-800: #0C2637;
  --line-600: #17455C;

  --cyan-400: #21E6C1;
  --amber-400: #F5B93F;
  --coral-400: #FF6A5C;
  --green-400: #46D39A;
  --white-100: #ECF4F8;
  --mist-400: #9AB2C0;
  --pale-200: #CFF7EF;

  --cyan-a10: rgba(33, 230, 193, 0.10);
  --cyan-a18: rgba(33, 230, 193, 0.18);
  --amber-a12: rgba(245, 185, 63, 0.12);
  --coral-a12: rgba(255, 106, 92, 0.12);
  --green-a12: rgba(70, 211, 154, 0.12);

  --font-display: 'Barlow Condensed', 'Oswald', 'Arial Narrow', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', Consolas, 'Courier New', monospace;
  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;

  --container: 1180px;
  --gutter: clamp(16px, 4vw, 40px);

  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur: 220ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--white-100);
  background-color: var(--ink-950);
  background-image:
    radial-gradient(120% 80% at 8% -10%, rgba(33, 230, 193, 0.10), transparent 60%),
    radial-gradient(90% 60% at 100% 0%, rgba(245, 185, 63, 0.06), transparent 55%),
    linear-gradient(rgba(23, 69, 92, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 69, 92, 0.10) 1px, transparent 1px);
  background-size: auto, auto, 72px 72px, 72px 72px;
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--white-100);
}

#main-content { scroll-margin-top: 104px; }

/* ---------- 4. 工具类 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 40px);
  background: linear-gradient(90deg, var(--line-600), rgba(23, 69, 92, 0));
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: var(--gutter);
  z-index: 500;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 999px;
  background: var(--amber-400);
  color: var(--ink-950);
  font-size: 14px;
  font-weight: 700;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: 16px;
  color: var(--ink-950);
}

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  padding: 16px clamp(12px, 3vw, 24px) 0;
  transition: padding 200ms var(--ease);
}

.site-header[data-compact="true"] { padding-top: 8px; }

.header-inner {
  position: relative;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  padding: 8px 10px 8px 14px;
  border: 1px solid var(--line-600);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(12, 38, 55, 0.95), rgba(6, 24, 38, 0.92));
  box-shadow:
    0 22px 50px -36px rgba(0, 0, 0, 0.95),
    inset 0 1px 0 rgba(207, 247, 239, 0.05);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: padding 200ms var(--ease);
}

.site-header[data-compact="true"] .header-inner { padding: 5px 8px 5px 12px; }

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  min-height: 40px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(150deg, var(--cyan-400), #0FBFA2);
  color: var(--ink-950);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.06em;
  box-shadow:
    0 0 0 1px rgba(33, 230, 193, 0.35),
    0 0 22px -6px rgba(33, 230, 193, 0.75);
  transition: transform var(--dur) var(--ease);
}

.brand:hover .brand-mark { transform: translateY(-1px) rotate(-2deg); }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--white-100);
}

.brand-tag {
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--mist-400);
  white-space: nowrap;
}

.brand--footer { margin-bottom: 4px; }

/* 导航 */
.nav-capsule {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item { list-style: none; }

.nav-link {
  display: block;
  padding: 8px clamp(8px, 1vw, 14px);
  border-radius: 999px;
  font-size: clamp(13px, 1.1vw, 14px);
  color: var(--mist-400);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--white-100);
  background: var(--cyan-a10);
}

.nav-link[aria-current="page"] {
  color: var(--cyan-400);
  background: var(--cyan-a18);
  box-shadow: inset 0 0 0 1px rgba(33, 230, 193, 0.35);
}

/* 状态点 */
.status-pill {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 6px 14px 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(70, 211, 154, 0.38);
  background: var(--green-a12);
  color: var(--green-400);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.status-pill:hover {
  background: rgba(70, 211, 154, 0.2);
  border-color: var(--green-400);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 3px rgba(70, 211, 154, 0.18);
  animation: statusPulse 3.2s var(--ease) infinite;
}

@keyframes statusPulse {
  0%, 70%, 100% { box-shadow: 0 0 0 3px rgba(70, 211, 154, 0.18); }
  35% { box-shadow: 0 0 0 6px rgba(70, 211, 154, 0.04); }
}

/* 菜单按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line-600);
  background: rgba(12, 38, 55, 0.75);
  color: var(--white-100);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan-400); color: var(--cyan-400); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
}

.nav-toggle-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle-bars span:nth-child(1) { top: 0; }
.nav-toggle-bars span:nth-child(2) { bottom: 0; }

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bars span:nth-child(2) {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 7. 头部移动端 ---------- */
@media (max-width: 880px) {
  .site-header { padding-top: 10px; }

  .site-header[data-compact="true"] { padding-top: 6px; }

  .header-inner {
    gap: 8px;
    padding: 6px 8px 6px 10px;
    border-radius: 20px;
  }

  .site-header[data-compact="true"] .header-inner { padding: 4px 6px 4px 8px; }

  .brand { min-height: 36px; gap: 8px; }

  .brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    font-size: 13px;
  }

  .brand-name { font-size: 15px; }

  .brand-tag { display: none; }

  .nav-toggle { display: inline-flex; }

  .status-pill {
    margin-left: auto;
    min-height: 32px;
    padding: 6px 10px;
  }

  .status-text { display: none; }

  .nav-capsule {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: block;
    padding: 10px;
    border: 1px solid var(--line-600);
    border-radius: 20px;
    background: rgba(8, 30, 46, 0.98);
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.95);
    max-height: 70vh;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 200ms var(--ease), transform 200ms var(--ease), visibility 200ms;
  }

  .site-header[data-open="true"] .nav-capsule {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-item { width: 100%; }

  .nav-link {
    padding: 12px 14px;
    border-radius: 12px;
    font-size: 15px;
    color: var(--white-100);
  }

  .nav-link[aria-current="page"] {
    box-shadow: inset 0 0 0 1px rgba(33, 230, 193, 0.4);
  }
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  border-top: 1px solid var(--line-600);
  background:
    radial-gradient(ellipse 80% 60% at 88% 0%, rgba(33, 230, 193, 0.08), transparent 62%),
    radial-gradient(ellipse 60% 50% at 4% 100%, rgba(245, 185, 63, 0.05), transparent 60%),
    linear-gradient(180deg, var(--ink-900) 0%, #05131F 100%);
  color: var(--mist-400);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(23, 69, 92, 0.28) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 69, 92, 0.22) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 72%);
  opacity: 0.55;
}

.site-footer > .container {
  position: relative;
  z-index: 1;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  padding-block: clamp(36px, 6vw, 72px) clamp(24px, 4vw, 40px);
}

.footer-brand { max-width: 34ch; }

.footer-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist-400);
}

.footer-stamp {
  display: inline-flex;
  align-items: center;
  margin-top: 20px;
  padding: 5px 12px;
  border: 1px dashed rgba(23, 69, 92, 0.95);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mist-400);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 36px);
}

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.footer-col-title::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--cyan-400);
  box-shadow: 0 0 8px rgba(33, 230, 193, 0.8);
}

.footer-links li + li { margin-top: 10px; }

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--white-100);
  transition: color var(--dur) var(--ease);
}

.footer-links a::before {
  content: "";
  width: 6px;
  height: 1px;
  background: var(--line-600);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.footer-links a:hover { color: var(--cyan-400); }

.footer-links a:hover::before {
  width: 14px;
  background: var(--cyan-400);
}

.footer-contact {
  display: grid;
  gap: 14px;
  padding-block: clamp(20px, 3vw, 28px);
  border-top: 1px solid rgba(23, 69, 92, 0.7);
  border-bottom: 1px solid rgba(23, 69, 92, 0.7);
}

.footer-contact .footer-col-title { margin-bottom: 0; }

.contact-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px 28px;
}

.contact-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
}

.contact-key {
  flex: 0 0 auto;
  color: var(--mist-400);
}

.contact-val {
  color: var(--white-100);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  padding-block: 20px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist-400);
}

.footer-legal { color: var(--mist-400); }

.footer-copy { color: var(--mist-400); }

.footer-cta {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid rgba(245, 185, 63, 0.45);
  border-radius: 999px;
  background: var(--amber-a12);
  color: var(--amber-400);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-cta:hover {
  background: var(--amber-400);
  border-color: var(--amber-400);
  color: var(--ink-950);
}

@media (max-width: 767px) {
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-cta { margin-left: 0; }
}

@media (min-width: 900px) {
  .footer-top { grid-template-columns: minmax(280px, 1fr) minmax(0, 1.6fr); }
  .footer-contact { grid-template-columns: 200px minmax(0, 1fr); align-items: start; gap: 32px; }
}

/* ---------- 9. 通用排版与章节组件 ---------- */
.section { padding-block: clamp(36px, 6vw, 80px); }

.section-head {
  display: grid;
  gap: 14px;
  max-width: 58ch;
  margin-bottom: clamp(22px, 4vw, 40px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--white-100);
  text-wrap: balance;
}

.lede {
  max-width: 38em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--mist-400);
}

/* ---------- 10. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: var(--amber-400);
  color: var(--ink-950);
  box-shadow: 0 14px 30px -18px rgba(245, 185, 63, 0.95);
}

.btn--primary:hover { background: #FFC95E; }

.btn--ghost {
  border-color: var(--line-600);
  background: rgba(12, 38, 55, 0.65);
  color: var(--white-100);
}

.btn--ghost:hover {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
}

.btn--quiet {
  border-color: rgba(33, 230, 193, 0.38);
  background: var(--cyan-a10);
  color: var(--cyan-400);
}

.btn--quiet:hover {
  background: var(--cyan-a18);
  border-color: var(--cyan-400);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  padding: 5px 13px;
  border: 1px solid var(--line-600);
  border-radius: 999px;
  background: rgba(12, 38, 55, 0.7);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist-400);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.chip:hover {
  color: var(--white-100);
  border-color: var(--cyan-400);
}

.chip[aria-pressed="true"] {
  border-color: var(--cyan-400);
  background: var(--cyan-a18);
  color: var(--cyan-400);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid currentColor;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.tag--cyan { color: var(--cyan-400); background: var(--cyan-a10); }
.tag--amber { color: var(--amber-400); background: var(--amber-a12); }
.tag--coral { color: var(--coral-400); background: var(--coral-a12); }
.tag--green { color: var(--green-400); background: var(--green-a12); }

/* ---------- 11. 卡片 / 面板 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 24px);
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(12, 38, 55, 0.92), rgba(8, 30, 46, 0.92));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.card:hover {
  border-color: rgba(33, 230, 193, 0.45);
  transform: translateY(-3px);
  box-shadow: 0 26px 50px -38px rgba(0, 0, 0, 0.95);
}

.card-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--white-100);
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist-400);
}

.card-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.panel {
  padding: clamp(16px, 2vw, 20px);
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background: rgba(12, 38, 55, 0.62);
}

/* ---------- 12. 数据带 ---------- */
.data-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background: var(--line-600);
}

.data-band > * {
  padding: clamp(14px, 2vw, 20px);
  background: var(--ink-850);
}

.data-value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--cyan-400);
}

.data-label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist-400);
}

@media (min-width: 768px) {
  .data-band { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 13. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.grid--12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.grid--12 > * { grid-column: span 4; }

@media (min-width: 768px) {
  .grid--12 { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .grid--12 > * { grid-column: span 8; }
  .span-md-6 { grid-column: span 6; }
  .span-md-4 { grid-column: span 4; }
}

@media (min-width: 1024px) {
  .grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .grid--12 > * { grid-column: span 12; }
  .span-lg-3 { grid-column: span 3; }
  .span-lg-4 { grid-column: span 4; }
  .span-lg-5 { grid-column: span 5; }
  .span-lg-7 { grid-column: span 7; }
  .span-lg-8 { grid-column: span 8; }
}

/* ---------- 14. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist-400);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--line-600);
}

.breadcrumb a {
  color: var(--mist-400);
  transition: color var(--dur) var(--ease);
}

.breadcrumb a:hover { color: var(--cyan-400); }

/* ---------- 15. 正文容器 ---------- */
.prose {
  max-width: 38em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist-400);
}

.prose > * + * { margin-top: 1em; }

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  color: var(--white-100);
}

.prose h2 { font-size: clamp(24px, 3vw, 30px); }

.prose h3 { font-size: clamp(19px, 2.2vw, 22px); }

.prose strong { color: var(--white-100); }

.prose a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.prose ul,
.prose ol {
  padding-left: 1.2em;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.4em; }

.prose blockquote {
  padding-left: 16px;
  border-left: 2px solid var(--cyan-400);
  font-family: var(--font-serif);
  color: var(--pale-200);
}

/* ---------- 16. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background:
    linear-gradient(135deg, rgba(33, 230, 193, 0.12), rgba(12, 38, 55, 0.9) 48%, rgba(6, 24, 38, 0.96));
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(23, 69, 92, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 69, 92, 0.28) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.35;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }

/* ---------- 17. 章节索引 ---------- */
.toc {
  position: sticky;
  top: 108px;
  font-size: 14px;
}

.toc-title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist-400);
}

.toc-list {
  display: grid;
  gap: 2px;
  border-left: 1px solid var(--line-600);
}

.toc-item { list-style: none; }

.toc-link {
  display: block;
  padding: 8px 12px 8px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--mist-400);
  line-height: 1.5;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.toc-link:hover {
  color: var(--white-100);
  border-left-color: var(--line-600);
  background: rgba(12, 38, 55, 0.6);
}

.toc-link[aria-current="true"] {
  color: var(--cyan-400);
  border-left-color: var(--cyan-400);
  background: var(--cyan-a10);
}

/* ---------- 18. JS 生成的进度条与返回顶部 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  width: 100%;
  height: 2px;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan-400), var(--amber-400));
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 150;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--line-600);
  border-radius: 999px;
  background: rgba(8, 30, 46, 0.94);
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur), border-color var(--dur) var(--ease);
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { border-color: var(--cyan-400); }

/* ---------- 19. 入场显现 ---------- */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 260ms var(--ease), transform 260ms var(--ease);
}

.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 20. 无障碍与降级 ---------- */
@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;
  }

  .js-reveal [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .to-top { transform: none; }

  .status-dot { animation: none; }
}

@media (max-width: 1023px) {
  .toc { position: static; top: auto; }
}