:root {
  --bg: #f8fafc;
  --ink: #0f172a;
  --brand: #1e293b;
  --accent: #38bdf8;
  --line: #cbd5e1;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}
a { color: #0369a1; }
.titlebar {
  background: var(--brand);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
}
.dots { display: flex; gap: 6px; }
.dots i { display: block; width: 10px; height: 10px; background: #64748b; }
.brand { color: #fff; text-decoration: none; display: flex; gap: 8px; align-items: center; font-weight: 700; }
.brand svg { width: 20px; height: 20px; }
.subbar {
  background: #334155;
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: 8px;
}
.subbar a { color: #cbd5e1; text-decoration: none; padding: 6px 14px; }
.subbar a.is-current { background: #0f172a; color: var(--accent); }
.wrap { width: min(1220px, calc(100% - 24px)); margin: 0 auto; }
.hero { padding: 28px 0 8px; }
.hero h1 { font-size: 30px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 8px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #0ea5e9;
  color: #fff;
  text-decoration: none;
  padding: 10px 14px;
  font-weight: 700;
}
.btn-mac, .btn-ios, .btn-and { background: var(--brand); }
section { padding: 22px 0; }
.cards-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.cards-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.card, .review, .news-item, .faq-item {
  background: #fff;
  border: 1px solid var(--line);
  padding: 14px;
}
table { width: 100%; border-collapse: collapse; background: #fff; }
th { background: #e0f2fe; }
th, td { border: 1px solid var(--line); padding: 8px; text-align: left; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.step { background: #fff; border-top: 3px solid #0ea5e9; padding: 12px; }
.site-footer { background: #0f172a; color: #cbd5e1; padding: 24px 0; }
.foot-nav a { color: #7dd3fc; margin-right: 12px; }
@media (max-width: 1000px) {
  .cards-4, .steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 700px) {
  .cards-4, .cards-2, .steps { grid-template-columns: 1fr; }
}