/* ============================================================
   飞驰炸金花 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部轨道 / 页脚 / 通用组件
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  background: #0B1220;
  scroll-behavior: smooth;
}

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

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

:focus-visible {
  outline: 2px solid #46E0D4;
  outline-offset: 2px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0B1220;
  --ink-700: #12203A;
  --ink-500: #24334F;
  --paper-100: #F2E9D8;
  --paper-200: #E3D6BE;
  --paper-line: #C9B795;
  --paper-ink: #5B4A2E;
  --neon-cyan: #46E0D4;
  --gold-500: #C9A24A;
  --card-red: #D0364A;
  --card-black: #14161C;
  --slate-400: #8294AE;
  --amber-line: #F0A03C;
  --signal-green: #4FBF8B;
  --text-hi: #E7EDF7;
  --text-body: #D9E2F0;
  --text-dim: #8294AE;

  --rail-w: 88px;
  --rail-w-open: 240px;
  --header-h: 56px;
  --maxw: 1440px;
  --gap: 20px;

  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 20px;
  --sp-5: 32px;
  --sp-6: 56px;
  --sp-7: 88px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "JetBrains Mono", "Roboto Mono", monospace;

  --dur: 240ms;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --line: 1px solid var(--ink-500);
  --line-soft: 1px solid rgba(36, 51, 79, .6);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: .01em;
  color: var(--text-body);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(36, 51, 79, .38) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 51, 79, .38) 1px, transparent 1px);
  background-size: 88px 88px;
  background-attachment: fixed;
}

.display {
  font-family: var(--font-sans);
  font-size: clamp(44px, 7vw, 104px);
  font-weight: 300;
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--text-hi);
}

.heading {
  font-family: var(--font-sans);
  font-size: clamp(20px, 2.4vw, 32px);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--text-hi);
}

.title-md {
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--text-hi);
}

.lead {
  max-width: 42ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-hi);
}

.index {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--slate-400);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--neon-cyan);
}

.muted { color: var(--slate-400); }

.rule {
  display: block;
  width: 100%;
  height: 0;
  border: 0;
  border-top: var(--line);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  border: 1px solid var(--ink-500);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.7;
  color: var(--slate-400);
  white-space: nowrap;
}

.tag--cyan { color: var(--neon-cyan); border-color: rgba(70, 224, 212, .5); }
.tag--gold { color: var(--gold-500); border-color: rgba(201, 162, 74, .5); }
.tag--red { color: var(--card-red); border-color: rgba(208, 54, 74, .5); }
.tag--green { color: var(--signal-green); border-color: rgba(79, 191, 139, .5); }

/* ---------- 4. 容器与网格 ---------- */
.shell {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.section { padding: var(--sp-6) 0; }
.section + .section { border-top: var(--line); }

.grid { display: grid; gap: var(--gap); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--8-4 { grid-template-columns: 8fr 4fr; }

/* Bento：单元格用 1px 网格线分隔，不使用留白 */
.bento {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-auto-rows: 220px;
  border-top: var(--line);
  border-left: var(--line);
}

.bento > * {
  grid-column: span 12;
  padding: var(--sp-4);
  overflow: hidden;
  background: var(--ink-700);
  border-right: var(--line);
  border-bottom: var(--line);
}

.cell-3 { grid-column: span 3; }
.cell-4 { grid-column: span 4; }
.cell-5 { grid-column: span 5; }
.cell-6 { grid-column: span 6; }
.cell-7 { grid-column: span 7; }
.cell-8 { grid-column: span 8; }
.cell-12 { grid-column: span 12; }
.row-2 { grid-row: span 2; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 18px;
  border: 1px solid var(--ink-500);
  background: transparent;
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.btn--primary { border-color: var(--neon-cyan); color: var(--neon-cyan); }
.btn--primary:hover { background: var(--neon-cyan); color: var(--ink-900); }

.btn--gold { border-color: var(--gold-500); color: var(--gold-500); }
.btn--gold:hover { background: var(--gold-500); color: var(--card-black); }

.btn--ghost { border-color: var(--ink-500); color: var(--slate-400); }
.btn--ghost:hover { border-color: var(--gold-500); color: var(--gold-500); }

.btn--block { width: 100%; }

.copy-btn {
  min-height: 24px;
  padding: 2px 8px;
  border: 1px solid var(--ink-500);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate-400);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.copy-btn:hover { color: var(--neon-cyan); border-color: var(--neon-cyan); }
.copy-btn[data-copied] { color: var(--signal-green); border-color: var(--signal-green); }

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 12px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--neon-cyan);
  color: var(--ink-900);
  font-size: 13px;
  letter-spacing: .08em;
  transition: top 160ms var(--ease);
}

.skip-link:focus { top: 12px; }

/* ---------- 7. 头部：左侧轨道（移动端为顶栏 + 抽屉） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  width: 100%;
  background: var(--ink-900);
  border-bottom: var(--line);
}

.rail {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: var(--header-h);
  padding: 0 16px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--paper-100);
}

.brand__mark {
  font-size: 15px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--paper-100);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: .12em;
  color: var(--gold-500);
}

.rail__hint,
.rail__meta,
.rail__progress { display: none; }

/* 移动端抽屉 */
.site-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  max-height: 82vh;
  overflow-y: auto;
  padding: 20px 20px 96px;
  background: var(--ink-700);
  border-top: 1px solid var(--neon-cyan);
  transform: translateY(105%);
  visibility: hidden;
  transition: transform 260ms var(--ease), visibility 0s linear 260ms;
}

.site-nav[data-open] {
  transform: translateY(0);
  visibility: visible;
  transition: transform 260ms var(--ease);
}

.site-nav__title {
  margin-bottom: var(--sp-3);
  color: var(--gold-500);
}

.nav-list { display: flex; flex-direction: column; }

.nav-item { border-bottom: var(--line); }
.nav-item:first-child { border-top: var(--line); }

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  min-height: 52px;
  padding: 0 8px 0 14px;
  color: var(--text-body);
  transition: color var(--dur) var(--ease);
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--neon-cyan);
  transform: translateY(-50%);
  transition: height 200ms var(--ease);
}

.nav-link:hover { color: var(--neon-cyan); }
.nav-link:hover::before { height: 40%; }

.nav-link__idx {
  min-width: 22px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--slate-400);
}

.nav-link__text { font-size: 15px; }

.nav-link[aria-current="page"] { color: var(--neon-cyan); }
.nav-link[aria-current="page"]::before { height: 60%; }
.nav-link[aria-current="page"] .nav-link__idx { color: var(--gold-500); }

.site-nav__foot {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

.site-nav__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.8;
  letter-spacing: .04em;
  color: var(--slate-400);
}

/* 移动端触发按钮 44×44 */
.nav-toggle {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 90;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--ink-500);
  background: var(--ink-700);
  color: var(--text-body);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  width: 100%;
  height: 1px;
  background: currentColor;
  transition: transform 200ms var(--ease), opacity 160ms linear;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

.nav-toggle__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
  clip-path: inset(50%);
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 65;
  background: rgba(11, 18, 32, .74);
  opacity: 0;
  visibility: hidden;
  transition: opacity 200ms linear, visibility 0s linear 200ms;
}

.nav-scrim[data-open] {
  opacity: 1;
  visibility: visible;
  transition: opacity 200ms linear;
}

body.nav-locked { overflow: hidden; }

/* 桌面端：常驻侧边轨道 */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
  body.nav-locked { overflow: auto; }

  .nav-toggle,
  .nav-scrim { display: none; }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail-w);
    height: 100vh;
    border-bottom: 0;
    border-right: var(--line);
    transition: width 220ms var(--ease);
  }

  .site-header:hover,
  .site-header:focus-within { width: var(--rail-w-open); }

  .rail {
    position: relative;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    height: 100%;
    padding: 20px 0 0;
    overflow: hidden;
  }

  .brand {
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 0 12px 20px;
    transition: padding 220ms var(--ease);
  }

  .brand__mark {
    font-size: 15px;
    letter-spacing: .08em;
    writing-mode: vertical-rl;
  }

  .brand__sub {
    font-size: 10px;
    letter-spacing: .16em;
    writing-mode: vertical-rl;
  }

  .site-header:hover .brand,
  .site-header:focus-within .brand {
    align-items: flex-start;
    padding-left: 24px;
  }

  .site-header:hover .brand__mark,
  .site-header:hover .brand__sub,
  .site-header:focus-within .brand__mark,
  .site-header:focus-within .brand__sub { writing-mode: horizontal-tb; }

  .rail__hint {
    display: block;
    padding: 12px 24px 0;
    font-family: var(--font-mono);
    font-size: 10px;
    line-height: 1.8;
    letter-spacing: .08em;
    color: var(--slate-400);
    opacity: 0;
    transition: opacity 160ms var(--ease) 60ms;
  }

  .site-header:hover .rail__hint,
  .site-header:focus-within .rail__hint { opacity: 1; }

  .site-nav {
    position: static;
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    min-height: 0;
    max-height: none;
    overflow-x: hidden;
    overflow-y: auto;
    transform: none;
    visibility: visible;
    padding: 16px 0 0;
    background: transparent;
    border-top: 0;
    transition: none;
  }

  .site-nav__title { padding: 0 24px; margin-bottom: 12px; }

  .nav-link { min-height: 48px; padding-left: 24px; white-space: nowrap; }
  .nav-link__text { opacity: 0; transition: opacity 160ms var(--ease) 60ms; }

  .site-header:hover .nav-link__text,
  .site-header:focus-within .nav-link__text { opacity: 1; }

  .site-nav__foot {
    margin-top: auto;
    padding: 20px 24px;
    gap: var(--sp-3);
    white-space: nowrap;
  }

  .rail__meta {
    display: block;
    padding: 0 24px 18px;
    font-family: var(--font-mono);
    font-size: 10px;
    line-height: 1.8;
    letter-spacing: .06em;
    color: var(--slate-400);
    opacity: 0;
    transition: opacity 160ms var(--ease) 60ms;
  }

  .site-header:hover .rail__meta,
  .site-header:focus-within .rail__meta { opacity: 1; }

  .rail__progress {
    position: absolute;
    right: 0;
    top: 0;
    display: block;
    width: 2px;
    height: 100%;
    background: var(--ink-500);
  }

  .rail__progress-bar {
    display: block;
    width: 100%;
    height: 0;
    background: linear-gradient(to bottom, var(--neon-cyan), var(--gold-500));
  }
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: var(--sp-7);
  background: var(--ink-900);
  border-top: var(--line);
}

.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-5);
  padding-top: var(--sp-6);
  padding-bottom: var(--sp-5);
}

.footer__mark {
  font-size: 20px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper-100);
}

.footer__sub {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gold-500);
}

.footer__tagline {
  max-width: 34ch;
  margin-top: var(--sp-4);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-body);
}

.footer__span {
  margin-top: var(--sp-4);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--slate-400);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4);
}

.footer__col-title {
  margin-bottom: 14px;
  color: var(--gold-500);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__link {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  font-size: 14px;
  color: var(--text-body);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer__link:hover { color: var(--neon-cyan); border-bottom-color: var(--neon-cyan); }

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-list__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
  padding-bottom: 10px;
  border-bottom: var(--line);
}

.contact-list__key {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--slate-400);
}

.contact-list__value {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-hi);
  word-break: break-word;
}

.footer__contact-note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.8;
  color: var(--slate-400);
}

.footer__bottom {
  border-top: var(--line);
  background: rgba(18, 32, 58, .55);
}

.footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.footer__legal,
.footer__copyright {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate-400);
}

.footer__note {
  max-width: 92ch;
  padding-bottom: 28px;
  font-size: 12px;
  line-height: 1.9;
  color: var(--slate-400);
}

@media (min-width: 768px) {
  .footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); }
  .footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__contact { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
  .footer__inner {
    grid-template-columns: minmax(220px, .9fr) minmax(0, 1.6fr) minmax(260px, 1.1fr);
    gap: var(--sp-6);
  }
  .footer__contact { grid-column: auto; }
}

/* ---------- 9. 面板 / 卡片 / 正文 / 面包屑 ---------- */
.panel {
  padding: var(--sp-4);
  background: var(--ink-700);
  border: var(--line);
}

.panel--ink { background: var(--card-black); }

.card {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  padding: var(--sp-4);
  background: var(--ink-700);
  border: var(--line);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.card:hover { border-color: var(--neon-cyan); transform: translateY(-2px); }

.panel--paper,
.card--paper {
  background: var(--paper-100);
  border-color: var(--paper-line);
  color: var(--card-black);
}

.panel--paper .display,
.panel--paper .heading,
.panel--paper .title-md,
.card--paper .display,
.card--paper .heading,
.card--paper .title-md { color: var(--card-black); }

.panel--paper .index,
.panel--paper .muted,
.card--paper .index,
.card--paper .muted { color: var(--paper-ink); }

.panel--paper .num,
.card--paper .num { color: #1C6E68; }

.prose { max-width: 660px; }
.prose p { margin-bottom: 1.2em; }
.prose p:last-child { margin-bottom: 0; }
.prose h2 { margin: var(--sp-5) 0 var(--sp-3); }
.prose h3 { margin: var(--sp-4) 0 var(--sp-2); }
.prose ul,
.prose ol { margin: 0 0 1.2em; padding-left: 1.2em; list-style: disc; }
.prose li { margin-bottom: .4em; }

.prose a,
.text-link {
  color: var(--neon-cyan);
  border-bottom: 1px solid rgba(70, 224, 212, .4);
  transition: border-color var(--dur) var(--ease);
}

.prose a:hover,
.text-link:hover { border-bottom-color: var(--neon-cyan); }

.breadcrumbs { padding-top: var(--sp-4); }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate-400);
}

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

.breadcrumbs__list li:not(:last-child)::after {
  content: "/";
  color: var(--ink-500);
}

.breadcrumbs__link { color: var(--slate-400); }
.breadcrumbs__link:hover { color: var(--neon-cyan); }

/* ---------- 10. 横向滚动带 ---------- */
.band {
  position: relative;
  padding-left: 2px;
  border-top: var(--line);
  border-bottom: var(--line);
}

.band__cursor {
  position: absolute;
  left: 0;
  top: 50%;
  z-index: 2;
  width: 2px;
  height: 36%;
  background: var(--neon-cyan);
  transform: translateY(-50%);
  transition: height var(--dur) var(--ease);
}

.band:hover .band__cursor { height: 100%; }

.band__wrap {
  position: relative;
  overflow: hidden;
}

.band__wrap::before,
.band__wrap::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 40px;
  z-index: 3;
  pointer-events: none;
}

.band__wrap::before { left: 0; background: linear-gradient(to right, var(--ink-900), rgba(11, 18, 32, 0)); }
.band__wrap::after { right: 0; background: linear-gradient(to left, var(--ink-900), rgba(11, 18, 32, 0)); }

.band__track {
  display: flex;
  gap: var(--gap);
  overflow-x: auto;
  padding: var(--sp-4);
  scroll-behavior: smooth;
  cursor: grab;
  overscroll-behavior-x: contain;
}

.band__track.is-dragging { cursor: grabbing; scroll-behavior: auto; }
.band__track > * { flex: 0 0 auto; }

.band__item { width: 220px; }

.band__arrows {
  display: flex;
  gap: 8px;
  padding: 0 var(--sp-4) var(--sp-4);
}

.band__arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate-400);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.band__arrow:hover { color: var(--neon-cyan); border-color: var(--neon-cyan); }
.band__arrow:disabled { opacity: .35; cursor: not-allowed; }

/* ---------- 11. 图形容器（供页面阶段放 SVG / 暗调位图） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--ink-700);
  border: var(--line);
}

.media::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(70, 224, 212, .08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(70, 224, 212, .08) 1px, transparent 1px);
  background-size: 32px 32px;
}

.media > img,
.media > svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media--3-2 { aspect-ratio: 3 / 2; }

.media__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 6px 10px;
  background: var(--ink-900);
  border-top: var(--line);
  border-right: var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--neon-cyan);
}

/* ---------- 12. 数据表 ---------- */
.table-wrap { width: 100%; overflow-x: auto; }

.data-table {
  width: 100%;
  font-size: 14px;
  border: var(--line);
}

.data-table caption {
  padding-bottom: 8px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--slate-400);
}

.data-table th {
  padding: 10px 12px;
  background: rgba(36, 51, 79, .38);
  border-bottom: var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .1em;
  text-align: left;
  color: var(--slate-400);
  white-space: nowrap;
}

.data-table td {
  padding: 12px;
  border-bottom: var(--line-soft);
  color: var(--text-body);
  vertical-align: top;
}

.data-table tbody tr { transition: background-color 160ms linear; }
.data-table tbody tr:hover { background: rgba(70, 224, 212, .06); }
.data-table tbody tr[data-open] { border-left: 2px solid var(--gold-500); }
.data-table td .num,
.data-table td.mono { text-align: right; }

.data-table--paper {
  background: var(--paper-100);
  border-color: var(--paper-line);
  color: var(--card-black);
}

.data-table--paper th {
  background: var(--paper-200);
  border-bottom-color: var(--paper-line);
  color: var(--paper-ink);
}

.data-table--paper td {
  border-bottom-color: rgba(201, 183, 149, .7);
  color: var(--card-black);
}

/* ---------- 13. 折叠问答 ---------- */
.faq-item { border-top: var(--line); }
.faq-item:last-child { border-bottom: var(--line); }

.faq-item__trigger {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  width: 100%;
  padding: 20px 0;
  text-align: left;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-hi);
  transition: color var(--dur) var(--ease);
}

.faq-item__trigger:hover { color: var(--neon-cyan); }

.faq-item__no {
  flex: 0 0 auto;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gold-500);
}

.faq-item__icon {
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--slate-400);
  transition: transform 200ms var(--ease), color var(--dur) var(--ease);
}

.faq-item[data-open] .faq-item__icon { transform: rotate(45deg); color: var(--neon-cyan); }
.faq-item[data-open] { border-left: 2px solid var(--gold-500); }

.faq-item__panel {
  padding: 0 0 20px 44px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-body);
}

/* ---------- 14. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 240ms ease-out, transform 240ms ease-out;
}

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

/* ---------- 15. 响应式 ---------- */
@media (min-width: 640px) {
  .shell { padding-left: 32px; padding-right: 32px; }
  .footer__bottom-inner,
  .footer__note { padding-left: 0; padding-right: 0; }
}

@media (min-width: 1024px) {
  .shell { padding-left: 32px; padding-right: 32px; }
}

@media (max-width: 1023px) {
  .bento {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    grid-auto-rows: minmax(180px, auto);
  }
  .cell-3, .cell-4, .cell-5 { grid-column: span 3; }
  .cell-6, .cell-7, .cell-8, .cell-12 { grid-column: span 6; }
  .row-2 { grid-row: auto; }

  .grid--7-5,
  .grid--8-4,
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 767px) {
  .bento { grid-template-columns: minmax(0, 1fr); grid-auto-rows: auto; }
  .bento > *,
  .cell-3, .cell-4, .cell-5, .cell-6, .cell-7, .cell-8, .cell-12 { grid-column: span 1; }

  .footer__cols { grid-template-columns: minmax(0, 1fr); }
  .band__item { width: 180px; }
}

/* ---------- 16. reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

  [data-reveal] { opacity: 1 !important; transform: none !important; }

  .band__track { scroll-behavior: auto; }
  .site-header:hover { width: var(--rail-w); }
}