:root {
  --ink: #0f172a;
  --muted: #475569;
  --blue: #1d4ed8;
  --blue-dark: #1e3a8a;
  --surface: #f8fafc;
  --line: #e2e8f0;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  line-height: 1.75;
}
a { color: inherit; }
.container { width: min(1120px, calc(100% - 32px)); margin-inline: auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; }
.brand-mark { display: grid; place-items: center; width: 36px; height: 36px; color: #fff; background: var(--blue); border-radius: 10px; }
.desktop-nav { display: flex; align-items: center; gap: 26px; }
.desktop-nav a { color: #334155; text-decoration: none; font-weight: 600; }
.desktop-nav a:hover { color: var(--blue); }
.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  color: #fff;
  background: var(--blue);
  border-radius: 12px;
  text-decoration: none;
  font-weight: 700;
}
.button:hover { background: var(--blue-dark); }
.button.secondary { color: var(--ink); background: #fff; border: 1px solid #cbd5e1; }
.mobile-nav { display: none; position: relative; }
.mobile-nav summary { list-style: none; cursor: pointer; padding: 10px; font-weight: 700; }
.mobile-nav summary::-webkit-details-marker { display: none; }
.mobile-panel {
  position: absolute;
  top: 50px;
  right: 0;
  width: 240px;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 20px 45px rgba(15,23,42,.14);
}
.mobile-panel a { display: block; padding: 11px 12px; text-decoration: none; border-radius: 8px; }
.mobile-panel a:hover { background: var(--surface); }
.breadcrumb { padding-top: 28px; color: #64748b; font-size: 14px; }
.breadcrumb a { color: #475569; text-decoration: none; }
.hero { padding: 66px 0 80px; background: linear-gradient(180deg, #eff6ff 0%, #fff 100%); }
.eyebrow { color: var(--blue); font-size: 14px; font-weight: 800; letter-spacing: .04em; }
h1 { max-width: 900px; margin: 12px 0 22px; font-size: clamp(38px, 6vw, 68px); line-height: 1.12; letter-spacing: -.035em; }
.hero-lead { max-width: 760px; margin: 0; color: var(--muted); font-size: clamp(18px, 2vw, 22px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.section { padding: 72px 0; }
.section.alt { background: var(--surface); }
.section-heading { max-width: 760px; margin-bottom: 34px; }
.section-heading h2 { margin: 0 0 12px; font-size: clamp(28px, 4vw, 42px); line-height: 1.25; }
.section-heading p { margin: 0; color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { padding: 26px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
.card h2, .card h3 { margin-top: 0; line-height: 1.35; }
.card p { color: var(--muted); }
.card-link { display: block; height: 100%; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease; }
.card-link:hover { transform: translateY(-3px); box-shadow: 0 18px 35px rgba(15,23,42,.09); }
.icon { display: grid; width: 48px; height: 48px; margin-bottom: 18px; place-items: center; color: var(--blue); background: #eff6ff; border-radius: 13px; font-weight: 900; }
.prose { max-width: 820px; }
.prose h2 { margin: 46px 0 14px; font-size: 30px; line-height: 1.35; }
.prose h3 { margin: 30px 0 10px; font-size: 22px; }
.prose p, .prose li { color: #334155; }
.prose li + li { margin-top: 8px; }
.process { counter-reset: step; }
.process .card::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 12px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 900;
}
.faq details { padding: 20px 0; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-size: 18px; font-weight: 750; }
.faq p { color: var(--muted); }
.cta { padding: 44px; color: #fff; background: #0f172a; border-radius: 24px; }
.cta h2 { margin-top: 0; font-size: clamp(28px, 4vw, 42px); line-height: 1.25; }
.cta p { max-width: 700px; color: #cbd5e1; }
.cta .button { background: #fff; color: #0f172a; }
.meta { color: #64748b; font-size: 14px; }
.site-footer { margin-top: 70px; padding: 48px 0 28px; color: #cbd5e1; background: #0f172a; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; }
.site-footer h2, .site-footer h3 { color: #fff; }
.site-footer a { color: #cbd5e1; text-decoration: none; }
.footer-links { display: grid; gap: 8px; }
.copyright { margin-top: 34px; padding-top: 22px; border-top: 1px solid #334155; font-size: 14px; }
.skip-link { position: fixed; left: 12px; top: -60px; z-index: 99; padding: 10px 14px; color: #fff; background: var(--blue); }
.skip-link:focus { top: 12px; }

@media (max-width: 820px) {
  .desktop-nav, .header-cta { display: none; }
  .mobile-nav { display: block; }
  .grid, .grid.two, .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 46px 0 62px; }
  .section { padding: 54px 0; }
  .cta { padding: 28px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}