/* 简洁响应式样式，用于落地页 */
:root{
  --bg:#f7f9fc;
  --card:#ffffff;
  --accent:#1f7aec;
  --text:#202124;
  --muted:#606770;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial; background:var(--bg); color:var(--text); -webkit-font-smoothing:antialiased}
.wrap{min-height:100%;display:flex;align-items:center;justify-content:center;padding:32px}
.card{width:100%;max-width:420px;background:var(--card);border-radius:12px;box-shadow:0 6px 22px rgba(18,38,63,0.08);padding:28px;text-align:center}
.title{margin:0;font-size:20px;font-weight:600}
.subtitle{color:var(--muted);margin:10px 0 20px;font-size:14px}
.logo{width:88px;height:88px;border-radius:16px;object-fit:cover;margin:0 auto 12px;display:block}
.title{font-size:22px}
.btn{display:inline-block;padding:12px 20px;background:var(--accent);color:white;border-radius:8px;text-decoration:none;font-weight:600;margin:8px 0}
.btn:active{transform:translateY(1px)}
.qr-area{margin-top:18px;display:flex;flex-direction:column;align-items:center}
.qr-text{margin-top:8px;color:var(--muted);font-size:13px}
.small{margin-top:14px;color:var(--muted);font-size:12px}
.hint{margin-top:12px;color:var(--muted);font-size:12px;background:#f1f6ff;padding:8px;border-radius:6px}
code{background:#f3f4f6;padding:2px 6px;border-radius:4px;font-size:12px}
@media (max-width:420px){.card{padding:20px;margin:0 8px}}