:root {
  --ink: #102033;
  --muted: #4b5d73;
  --line: #d5e2f0;
  --paper: #f4f8fc;
  --card: #ffffff;
  --brand: #0b5cab;
  --brand-dark: #083d75;
  --brand-soft: #e7f1fb;
  --cta: #0d7ddb;
  --cta-hover: #0a68b8;
  --foot: #07182b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 16px/1.75 "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { vertical-align: middle; }

.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #fff;
  border-bottom: 3px solid var(--brand);
}
.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--brand-dark);
  font-weight: 700;
  font-size: 20px;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.nav { display: flex; gap: 8px; }
.nav a {
  padding: 8px 14px;
  color: var(--ink);
  border-bottom: 2px solid transparent;
}
.nav a.now {
  color: var(--brand);
  border-bottom-color: var(--brand);
  font-weight: 700;
}

.hero {
  background: linear-gradient(135deg, #083d75 0%, #0b5cab 48%, #1490d8 100%);
  color: #fff;
  padding: 72px 0 80px;
}
.hero h1 {
  margin: 0 0 16px;
  font-size: 36px;
  line-height: 1.3;
  max-width: 18em;
}
.hero p { margin: 0 0 28px; max-width: 40em; color: #e5f1fb; font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 4px;
  font-weight: 700;
  border: 0;
}
.btn:hover { text-decoration: none; }
.btn-main { background: #ffc107; color: #102033; }
.btn-main:hover { background: #ffca2b; }
.btn-ghost { background: transparent; color: #fff; border: 1px solid #fff; }
.btn-line { background: #fff; color: var(--brand); border: 1px solid var(--brand); }
.btn-line:hover { background: var(--brand-soft); }

.block { padding: 64px 0; }
.block h2 { margin: 0 0 14px; font-size: 28px; color: var(--brand-dark); }
.lead { color: var(--muted); margin: 0 0 28px; }
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}
.card h3 { margin: 10px 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.split p { margin-top: 0; }
.alt { background: #fff; }
.note {
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
  padding: 16px 18px;
  margin: 20px 0 0;
}
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
th { background: var(--brand-dark); color: #fff; }
.faq { margin: 0; }
.faq dt { font-weight: 700; margin: 18px 0 6px; }
.faq dd { margin: 0; color: var(--muted); }
.dl-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 24px 0;
}
.dl-row a {
  display: block;
  text-align: center;
  background: var(--brand);
  color: #fff;
  padding: 14px 8px;
  border-radius: 4px;
  font-weight: 700;
}
.dl-row a:hover { background: var(--brand-dark); text-decoration: none; }
ol.steps { padding-left: 20px; }
ol.steps li { margin: 8px 0; }
.foot {
  background: var(--foot);
  color: #c9d6e4;
  padding: 36px 0 28px;
  font-size: 14px;
}
.foot a { color: #9ec5f0; }
.foot strong { color: #fff; display: block; margin-bottom: 8px; }
.safe { margin: 0 0 12px; }
.copy { margin: 0; color: #8aa0b8; }

@media (max-width: 900px) {
  .grid-4, .split, .dl-row { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 28px; }
}
@media (max-width: 640px) {
  .top-inner { flex-direction: column; align-items: flex-start; padding: 12px 0; }
  .grid-4, .split, .dl-row { grid-template-columns: 1fr; }
  .nav { flex-wrap: wrap; }
}