:root {
  color-scheme: dark;
  --bg: #07111f;
  --surface: #0e1b2d;
  --surface-soft: #13243a;
  --text: #f4f7fb;
  --muted: #a9b8ca;
  --line: #29415f;
  --brand: #ff4d8d;
  --brand-2: #8b5cf6;
  --accent: #63d6c5;
  --max: 1120px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: radial-gradient(circle at 12% 0%, rgba(139, 92, 246, .2), transparent 32rem), radial-gradient(circle at 88% 8%, rgba(255, 77, 141, .15), transparent 28rem), var(--bg);
  color: var(--text);
  font: 16px/1.75 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
a { color: inherit; }
.skip-link { position: absolute; left: -9999px; top: 1rem; }
.skip-link:focus { left: 1rem; z-index: 10; padding: .5rem .75rem; border-radius: .5rem; background: var(--text); color: var(--bg); }
.site-header, .site-footer, main { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.25rem 0; }
.brand { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
.brand img { width: 2rem; height: 2rem; }
.top-nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .8rem 1.1rem; color: var(--muted); font-size: .92rem; }
.top-nav a:hover { color: var(--text); }
.hero { padding: clamp(4rem, 9vw, 7.5rem) 0 4rem; text-align: center; }
.eyebrow { margin: 0 0 1rem; color: var(--accent); font-size: .78rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.25; letter-spacing: -.025em; }
h1 { max-width: 920px; margin: 0 auto; font-size: clamp(2.25rem, 6vw, 4.8rem); }
h2 { margin-top: 0; font-size: clamp(1.55rem, 3vw, 2.35rem); }
h3 { font-size: 1.08rem; }
.lede { max-width: 780px; margin: 1.35rem auto 0; color: var(--muted); font-size: clamp(1.02rem, 2vw, 1.22rem); }
.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .85rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 2.85rem; padding: .65rem 1.15rem; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; font-weight: 750; }
.button.primary { border-color: transparent; background: linear-gradient(120deg, var(--brand), var(--brand-2)); color: white; }
.answer-box, .section, .card, .faq details { border: 1px solid var(--line); background: rgba(14, 27, 45, .88); box-shadow: 0 18px 50px rgba(0, 0, 0, .16); }
.answer-box { max-width: 900px; margin: 0 auto 2rem; padding: 1.4rem 1.6rem; border-radius: 1.25rem; text-align: left; }
.answer-box strong, th { color: var(--accent); }
.section { margin: 1.25rem 0; padding: clamp(1.5rem, 4vw, 3rem); border-radius: 1.5rem; }
.section > :last-child, .card p:last-child { margin-bottom: 0; }
.muted, .faq details p { color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.card { padding: 1.25rem; border-radius: 1rem; }
.card h2, .card h3 { margin-top: 0; }
.number { display: inline-grid; width: 2.1rem; height: 2.1rem; place-items: center; border-radius: 50%; background: var(--surface-soft); color: var(--accent); font-weight: 850; }
table { width: 100%; border-collapse: collapse; font-size: .94rem; }
th, td { padding: .8rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.table-wrap { overflow-x: auto; }
.faq details { margin: .7rem 0; padding: 1rem 1.15rem; border-radius: .9rem; }
.faq summary { cursor: pointer; font-weight: 750; }
.breadcrumb { margin: 1rem 0 0; color: var(--muted); font-size: .88rem; }
.breadcrumb a { color: var(--accent); }
.callout { border-left: 3px solid var(--brand); padding: .2rem 0 .2rem 1rem; color: var(--muted); }
.site-footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; margin-top: 2rem; padding: 2rem 0 3rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; }
.site-footer p { margin: 0; }
@media (max-width: 780px) { .site-header { align-items: flex-start; } .top-nav { max-width: 65%; } .grid { grid-template-columns: 1fr; } .hero { padding-top: 3rem; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }