* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  background: #f4f5f7;
  color: #1f2933;
  line-height: 1.7;
}
a { color: inherit; }
img { max-width: 100%; }
.top {
  position: sticky; top: 0; z-index: 2;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 0 28px; height: 60px;
  background: #1f2933; color: #fff;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; letter-spacing: 0.04em; }
.mark {
  width: 32px; height: 32px; border-radius: 8px; display: block; object-fit: cover;
}
.nav { display: flex; gap: 18px; align-items: center; }
.nav a { color: #e5e7eb; text-decoration: none; font-size: 14px; }
.nav a.solid {
  background: #d32f2f; color: #fff; border-radius: 8px; padding: 7px 12px;
}
.wrap { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }
.hero { padding: 64px 0 36px; }
.hero-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center; }
.kicker { margin: 0 0 8px; color: #b71c1c; font-size: 13px; font-weight: 700; letter-spacing: 0.12em; }
h1 { margin: 0; font-size: 44px; line-height: 1.25; letter-spacing: -0.02em; }
.lead { margin: 16px 0 0; font-size: 18px; color: #374151; max-width: 38em; }
.actions { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.btn {
  display: inline-block; text-decoration: none; border-radius: 8px;
  padding: 12px 18px; font-weight: 700;
}
.btn.red { background: #d32f2f; color: #fff; }
.btn.line { background: #fff; color: #1f2933; border: 1px solid #e6e8ec; }
.fine { margin: 12px 0 0; color: #6b7280; font-size: 13px; }
.phone {
  background: #fff; border: 1px solid #e6e8ec; border-radius: 28px;
  padding: 14px; box-shadow: 0 16px 40px rgba(31, 41, 51, 0.08);
}
.phone-bar { height: 22px; border-radius: 12px; background: #b71c1c; }
.card {
  margin-top: 12px; background: #fff; border: 1px solid #e6e8ec; border-radius: 12px; padding: 14px;
}
.route { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.route strong { font-size: 18px; }
.fare { color: #b71c1c; font-weight: 700; }
.meta { margin: 8px 0 0; color: #6b7280; font-size: 13px; }
section { padding: 28px 0; }
h2 { margin: 0 0 8px; font-size: 28px; }
.sub { margin: 0 0 20px; color: #6b7280; }
.grid3, .grid2 { display: grid; gap: 14px; }
.grid3 { grid-template-columns: repeat(3, 1fr); }
.grid2 { grid-template-columns: 1fr 1fr; }
.panel { background: #fff; border: 1px solid #e6e8ec; border-radius: 12px; padding: 18px 18px 16px; }
.panel h3 { margin: 0 0 8px; font-size: 18px; }
.panel p { margin: 0; color: #374151; }
.steps { display: grid; gap: 10px; }
.step { display: grid; grid-template-columns: 36px 1fr; gap: 12px; align-items: start; background: #fff; border: 1px solid #e6e8ec; border-radius: 12px; padding: 14px; }
.num {
  width: 36px; height: 36px; border-radius: 8px; background: #d32f2f; color: #fff;
  display: grid; place-items: center; font-weight: 700;
}
.step p { margin: 0; }
.band {
  margin: 12px 0 40px; background: #1f2933; color: #fff; border-radius: 16px; padding: 28px;
  display: flex; justify-content: space-between; gap: 18px; align-items: center;
}
.band p { margin: 6px 0 0; color: #d1d5db; }
.foot {
  border-top: 1px solid #e6e8ec; padding: 22px 0 32px; color: #6b7280; font-size: 13px;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.foot a { color: #1f2933; }
.download-grid { display: grid; grid-template-columns: 1fr 360px; gap: 28px; align-items: start; padding: 48px 0 24px; }
.release { background: #fff; border: 1px solid #e6e8ec; border-radius: 16px; padding: 22px; }
.release h2 { font-size: 16px; color: #6b7280; font-weight: 600; }
.version { margin: 4px 0 12px; font-size: 32px; }
.notes { white-space: pre-wrap; margin: 0 0 16px; }
.wait { color: #6b7280; }
.btn[hidden] { display: none; }
.doc { background: #fff; border: 1px solid #e6e8ec; border-radius: 12px; padding: 22px; margin: 28px 0 40px; white-space: pre-wrap; }
@media (max-width: 800px) {
  h1 { font-size: 32px; }
  .hero { padding-top: 36px; }
  .hero-grid, .grid3, .grid2, .download-grid { grid-template-columns: 1fr; }
  .band { flex-direction: column; align-items: flex-start; }
  .top { padding: 0 16px; }
  .nav { gap: 12px; }
}