* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f5f6fa; color: #1f2329; min-height: 100vh;
}
.header { padding: 48px 24px 24px; text-align: center; }
.header h1 { font-size: 28px; }
.subtitle { margin-top: 8px; color: #9aa0a6; font-size: 14px; }
.grid {
  max-width: 720px; margin: 0 auto; padding: 0 16px 32px;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px;
}
.card {
  background: #fff; border-radius: 16px; padding: 24px 12px;
  box-shadow: 0 4px 16px rgba(31,35,41,.06);
  text-align: center;
  overflow: hidden;
}
.card .badge {
  width: 56px; height: 56px; border-radius: 14px; margin: 0 auto;
  background: #2f6bff; color: #fff; font-size: 26px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
}
.card .name { margin-top: 12px; font-size: 16px; font-weight: 600; }
.card .desc { margin-top: 6px; font-size: 12px; color: #9aa0a6; }
.tip { grid-column: 1 / -1; text-align: center; color: #9aa0a6; padding: 48px 0; }
.tip.error { color: #e54545; }
.footer { text-align: center; color: #c0c4cc; font-size: 12px; padding: 24px 0 40px; }