:root {
  --blue: #2f6bff;
  --blue-dark: #1d4ed8;
  --green: #128a3e;
  --ink: #1f2933;
  --muted: #5c6b7a;
  --line: #e6eef5;
  --bg: #f4f8fc;
  --card: #ffffff;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: #fff;
}
a { color: inherit; text-decoration: none; }

.topbar {
  background: #f7fafc;
  color: var(--muted);
  font-size: 13px;
  border-bottom: 1px solid var(--line);
}
.topbar .inner, .nav .inner, .wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.topbar .inner { display: flex; justify-content: space-between; gap: 16px; padding: 8px 0; }

.nav {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid var(--line);
  z-index: 2;
}
.nav .inner { display: flex; align-items: center; gap: 28px; min-height: 76px; }
.logo { display: flex; align-items: center; height: 56px; }
.logo img { height: 56px; width: auto; }
.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 15px; }
.nav-links a:hover { color: var(--blue); }
.nav-links a.current { color: var(--blue); font-weight: 600; }

.hero {
  background:
    radial-gradient(900px 280px at 15% 20%, rgba(47, 107, 255, 0.12), transparent 60%),
    linear-gradient(180deg, #f3f8ff 0%, #ffffff 100%);
  padding: 72px 0 56px;
}
.hero h1 { margin: 0 0 12px; font-size: 42px; letter-spacing: 1px; }
.hero p.lead { margin: 0; max-width: 640px; color: var(--muted); font-size: 18px; line-height: 1.7; }
.hero-actions { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 4px;
  background: var(--blue);
  color: #fff;
  font-size: 15px;
}
.btn:hover { background: var(--blue-dark); }
.btn.ghost { background: #fff; color: var(--blue); border: 1px solid #c9d8ff; }
.btn.ghost:hover { background: #f3f7ff; }

.section { padding: 28px 0 64px; background: var(--bg); }
.cards { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 18px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px;
}
.card h2 { margin: 0 0 8px; font-size: 22px; }
.card .meta { color: var(--green); font-weight: 600; min-height: 22px; }
.card p { color: var(--muted); line-height: 1.7; }
.dl { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.notes {
  white-space: pre-wrap;
  background: #f8fafc;
  border-radius: 8px;
  padding: 14px 16px;
  color: #334155;
  line-height: 1.6;
  min-height: 120px;
}

.intro { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 18px; }
.intro article { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 20px; }
.intro h3 { margin: 0 0 8px; }
.intro p { margin: 0; color: var(--muted); line-height: 1.7; }

footer {
  background: #12324d;
  color: #d5e2ee;
  padding: 36px 0 22px;
  font-size: 14px;
}
footer a { color: #fff; }
.foot { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px; }
footer h4 { margin: 0 0 10px; color: #fff; }
footer p { margin: 0 0 6px; line-height: 1.7; }
.legal { margin-top: 22px; padding-top: 14px; border-top: 1px solid rgba(255,255,255,.15); color: #9fb3c6; }

.steps { display: flex; flex-direction: column; gap: 28px; }
.step {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px;
}
.step h2 { margin: 0 0 8px; font-size: 22px; }
.step ol { margin: 8px 0 0; padding-left: 20px; color: var(--ink); line-height: 1.8; }
.step p { color: var(--muted); line-height: 1.7; }
.shot {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #f8fafc;
}
.shot img { display: block; width: 100%; max-width: 100%; height: auto; }

@media (max-width: 800px) {
  .cards, .intro, .foot { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  .nav-links { display: none; }
}