:root {
  color-scheme: light;
  --ink: #17233a;
  --muted: #5f6f86;
  --line: #e7eef8;
  --paper: #f5f8fd;
  --blue: #2366ef;
  --card: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.85;
  font-size: 17px;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.top {
  position: sticky;
  top: 0;
  z-index: 2;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
}

.top-inner,
.wrap,
.foot-inner {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
}

.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

.brand {
  color: var(--ink);
  font-weight: 800;
  font-size: 18px;
  text-decoration: none;
}

.brand small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 14px;
  font-size: 14px;
}

.nav a { color: #2f3d55; font-weight: 650; }

main { padding: 28px 0 12px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px 28px 12px;
}

h1 {
  margin: 0;
  font-size: 40px;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.lead {
  margin: 14px 0 0;
  color: #3d4d63;
  font-size: 18px;
}

section { margin-top: 8px; }

h2 {
  margin: 22px 0 0;
  font-size: 22px;
}

p { margin: 10px 0 0; }

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 8px;
}

.cta a,
.related a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  text-decoration: none;
}

.cta a {
  background: var(--blue);
  color: #fff;
  font-weight: 700;
}

.related {
  margin: 8px 0 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.related a {
  background: #eef4ff;
  color: var(--blue);
  font-weight: 700;
}

.faq { margin: 6px 0 22px; }
.faq h2 { margin-bottom: 8px; }
.faq dt { margin-top: 14px; font-weight: 800; }
.faq dd { margin: 4px 0 0; color: #3d4d63; }

.foot {
  margin-top: 20px;
  background: linear-gradient(160deg, #101f3c 0%, #14294f 100%);
  color: rgba(255, 255, 255, 0.72);
}

.foot-inner {
  padding: 28px 0;
  display: flex;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
  font-size: 14px;
}

.foot a { color: rgba(255, 255, 255, 0.72); }

@media (max-width: 720px) {
  .top-inner { align-items: flex-start; flex-direction: column; padding: 12px 0; }
  .nav { justify-content: flex-start; }
  h1 { font-size: 32px; }
  .card { padding: 22px 16px 8px; }
  .lead { font-size: 16px; }
}