:root {
  color: #172554;
  background: #f5f7ff;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 4%, rgba(129, 140, 248, .22), transparent 28rem),
    radial-gradient(circle at 88% 20%, rgba(56, 189, 248, .14), transparent 24rem),
    #f8faff;
}

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

.page { width: min(100% - 32px, 960px); margin: 0 auto; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}

.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 800; }
.brand-mark {
  display: grid; place-items: center; width: 34px; height: 34px; border-radius: 11px;
  color: white; background: linear-gradient(135deg, #6366f1, #2563eb); box-shadow: 0 8px 18px rgba(79, 70, 229, .23);
}
.back { color: #475569; font-size: 14px; font-weight: 650; }
.back:hover { color: #4f46e5; }

.hero { padding: 64px 0 46px; max-width: 760px; }
.eyebrow { color: #4f46e5; font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1 { margin: 14px 0 18px; color: #172554; font-size: clamp(34px, 6vw, 56px); line-height: 1.12; letter-spacing: -.04em; }
.lead { max-width: 650px; color: #475569; font-size: 18px; line-height: 1.8; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.primary, .secondary { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border-radius: 13px; font-size: 14px; font-weight: 750; }
.primary { color: white; background: linear-gradient(135deg, #4f46e5, #2563eb); box-shadow: 0 10px 22px rgba(79, 70, 229, .23); }
.secondary { color: #334155; background: rgba(255,255,255,.78); border: 1px solid #dbe3f2; }

.content { display: grid; gap: 18px; padding-bottom: 56px; }
.card { padding: 26px; border: 1px solid rgba(199, 210, 254, .7); border-radius: 22px; background: rgba(255,255,255,.76); box-shadow: 0 12px 28px rgba(30, 41, 59, .05); }
.card h2 { margin: 0 0 13px; color: #1e293b; font-size: 21px; }
.card p, .card li { color: #475569; line-height: 1.8; }
.card ul, .card ol { margin: 0; padding-left: 22px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.step { padding: 18px; border-radius: 16px; background: #f7f8ff; }
.step b { display: block; margin-bottom: 7px; color: #4338ca; font-size: 13px; }
.step span { color: #475569; font-size: 14px; line-height: 1.6; }
.notice { border-left: 4px solid #818cf8; }
.links { display: flex; flex-wrap: wrap; gap: 10px; }
.links a { padding: 8px 11px; border-radius: 10px; background: #eef2ff; color: #4338ca; font-size: 13px; font-weight: 650; }
.footer { padding: 0 0 34px; color: #94a3b8; font-size: 13px; text-align: center; }

@media (max-width: 640px) {
  .hero { padding-top: 38px; }
  .lead { font-size: 16px; }
  .steps { grid-template-columns: 1fr; }
  .card { padding: 21px; }
}