* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, "Microsoft YaHei", "PingFang SC", sans-serif;
  background: linear-gradient(160deg, #f0f4ff 0%, #e8eefc 40%, #dbe6fa 100%); min-height: 100vh;
  display: flex; flex-direction: column; color: #1a2332; }
.a-header { text-align: center; padding: 48px 24px 16px; }
.a-logo { height: 56px; width: auto; }
.a-sub { font-size: 12.5px; color: #607d8b; margin-top: 8px; }
.a-main { flex: 1; display: flex; align-items: center; justify-content: center; padding: 16px 20px 40px; }
.a-card { background: #fff; border-radius: 20px; padding: 36px 30px; max-width: 420px; width: 100%;
  text-align: center; box-shadow: 0 4px 16px rgba(13,71,161,.1), 0 16px 44px rgba(13,71,161,.08); }
.a-card h2 { font-size: 21px; font-weight: 800; color: #1a73e8; }
.a-desc { font-size: 13px; color: #78909c; margin-top: 8px; }
.a-qr { margin: 28px 0; }
.a-qr-box { width: 150px; height: 150px; margin: 0 auto; border: 2px dashed #90caf9; border-radius: 14px;
  display: flex; align-items: center; justify-content: center; color: #90a4ae; font-size: 14px;
  background: #f5f9ff; }
.a-qr-tip { font-size: 12px; color: #b0bec5; margin-top: 12px; }
.a-btns { display: flex; gap: 12px; margin: 8px 0 18px; }
.a-btn { flex: 1; display: flex; align-items: center; gap: 10px; padding: 14px; border-radius: 14px;
  text-decoration: none; color: #fff; transition: opacity .2s; }
.a-btn:active { opacity: .85; }
.a-btn.android { background: linear-gradient(135deg,#43a047,#2e7d32); }
.a-btn.wechat { background: linear-gradient(135deg,#1aad19,#0d8a0d); }
.ab-ic { font-size: 26px; }
.a-btn b { font-size: 14px; } .a-btn i { font-size: 11px; opacity: .85; font-style: normal; }
.a-hint { font-size: 12.5px; color: #90a4ae; line-height: 1.7; }
.a-hint a { color: #1a73e8; text-decoration: none; }
.a-foot { text-align: center; font-size: 12px; color: #90a4ae; padding: 16px 20px 24px;
  border-top: 1px solid rgba(0,0,0,.05); background: rgba(255,255,255,.5); line-height: 1.8; }
.a-foot a { color: #90a4ae; text-decoration: none; }