:root {
  --ink: #102c4b;
  --muted: #5e7188;
  --blue: #2478ff;
  --cyan: #40d5ff;
  --line: #dce8f5;
  --soft: #f3f8ff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  background: linear-gradient(180deg, #f5faff 0, #fff 36%, #f3f8ff 100%);
}
a { color: inherit; text-decoration: none; }
.shell { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }
.site-header { background: rgba(255,255,255,.9); border-bottom: 1px solid var(--line); }
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; }
.brand::before { content: ""; width: 28px; height: 28px; border-radius: 10px; background: linear-gradient(135deg, var(--blue), var(--cyan)); box-shadow: 0 10px 20px rgba(36,120,255,.24); }
.nav-links { display: flex; gap: 20px; color: var(--muted); font-size: 14px; font-weight: 700; }
.hero { padding: 78px 0 62px; }
.crumb { color: #6380a1; font-size: 14px; }
.eyebrow { margin-top: 26px; color: #1767df; font-size: 14px; font-weight: 900; letter-spacing: .11em; text-transform: uppercase; }
h1 { max-width: 900px; margin: 16px 0; font-size: clamp(38px, 5vw, 66px); line-height: 1.08; letter-spacing: -.045em; }
.lead { max-width: 780px; margin: 0; color: var(--muted); font-size: 19px; line-height: 1.8; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 0 20px; border-radius: 999px; font-weight: 900; }
.button-primary { color: #fff; background: linear-gradient(135deg, #1f73ff, #45a3ff); box-shadow: 0 16px 30px rgba(36,120,255,.22); }
.button-ghost { color: #1767df; border: 1px solid #b8d4f6; background: #fff; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 46px; }
.stat { padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.8); }
.stat b { display: block; color: var(--blue); font-size: 22px; }
.stat span { display: block; margin-top: 6px; color: var(--muted); font-size: 14px; line-height: 1.5; }
main { padding-bottom: 70px; }
section { padding: 34px 0; }
.section-label { color: #1767df; font-size: 13px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
h2 { margin: 10px 0 16px; font-size: clamp(28px, 3vw, 42px); letter-spacing: -.035em; }
h3 { margin: 0 0 8px; font-size: 19px; }
p { color: var(--muted); line-height: 1.85; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: 0 14px 30px rgba(26,77,131,.06); }
.card p { margin: 0; font-size: 15px; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.step { padding: 20px; border-radius: 18px; background: #eaf4ff; }
.step b { color: var(--blue); font-size: 14px; }
.step h3 { margin-top: 12px; }
.step p { margin: 0; font-size: 14px; }
.faq { display: grid; gap: 10px; }
details { padding: 17px 20px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
summary { cursor: pointer; font-weight: 900; }
details p { margin: 12px 0 0; font-size: 15px; }
.related { padding: 34px; border-radius: 24px; color: #fff; background: linear-gradient(135deg, #0d3156, #1861a7); }
.related h2 { margin-top: 0; }
.related p { color: #d0e6fa; }
.related-links { display: flex; flex-wrap: wrap; gap: 10px; }
.related-links a { padding: 11px 14px; border: 1px solid rgba(255,255,255,.22); border-radius: 999px; background: rgba(255,255,255,.1); font-size: 14px; font-weight: 800; }
footer { padding: 28px 0; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 14px; justify-content: space-between; }
@media (max-width: 720px) {
  .shell { width: min(100% - 30px, 1080px); }
  .nav { min-height: 66px; }
  .nav-links { display: none; }
  .hero { padding: 52px 0 38px; }
  .lead { font-size: 17px; }
  .stats, .grid, .steps { grid-template-columns: 1fr; }
}