:root {
  --bg: #f4f7fb;
  --paper: #ffffff;
  --ink: #1e293b;
  --muted: #475569;
  --brand: #1a56db;
  --brand-ink: #ffffff;
  --line: #d7e2f3;
  --soft: #e8f0fe;
  --ok: #0f766e;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-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(--ink);
  font-weight: 700;
  font-size: 20px;
}
.brand:hover { text-decoration: none; }
.brand svg { width: 28px; height: 28px; display: block; }
.nav { display: flex; gap: 8px; }
.nav a {
  padding: 8px 14px;
  border-radius: 6px;
  color: var(--ink);
}
.nav a.is-current {
  background: var(--brand);
  color: var(--brand-ink);
}
.hero {
  background: linear-gradient(180deg, #dbe7ff 0%, var(--bg) 100%);
  padding: 48px 0 24px;
}
.hero-grid { display: block; }
.hero h1 { font-size: 34px; line-height: 1.35; margin: 0 0 16px; }
.hero-lead { font-size: 18px; color: var(--muted); margin: 0 0 24px; max-width: 46em; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 8px;
  padding: 12px 18px;
  font-weight: 700;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-win { background: var(--brand); color: #fff; }
.btn-mac { background: #0f172a; color: #fff; }
.btn-ios { background: #111827; color: #fff; }
.btn-and { background: #166534; color: #fff; }
.btn svg { width: 18px; height: 18px; }
.note { color: var(--muted); font-size: 14px; }
section { padding: 36px 0; }
section h2 { font-size: 24px; margin: 0 0 14px; }
.lead { color: var(--muted); margin-top: 0; }
.cards-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card, .review, .news-item, .faq-item {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 18px 8px;
}
.card h3, .review h3, .news-item h3 { margin: 0 0 8px; font-size: 18px; }
.table-wrap { overflow-x: auto; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--line); text-align: left; padding: 10px 12px; vertical-align: top; }
th { background: var(--soft); }
.steps { display: grid; gap: 12px; }
.step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}
.step b {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
}
.news-list, .faq-list, .reviews { display: grid; gap: 12px; }
.news-date, .meta { color: var(--ok); font-size: 13px; font-weight: 700; }
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 28px 0 36px;
  margin-top: 24px;
}
.site-footer .brand { color: #fff; margin-bottom: 10px; }
.site-footer p { margin: 8px 0; }
.foot-nav { display: flex; gap: 16px; margin: 12px 0; }
.foot-nav a { color: #93c5fd; }
@media (max-width: 900px) {
  .cards-3 { grid-template-columns: 1fr; }
  .header-inner { flex-direction: column; padding: 12px 0; }
}