*{box-sizing:border-box}body{margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;background:#f3f5f9;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:#1d2433}
.box{width:min(360px,92vw);background:#fff;border-radius:14px;padding:32px 28px;box-shadow:0 8px 30px rgba(20,30,60,.08)}
h1{font-size:20px;margin:0 0 6px}p{color:#6b7385;font-size:13px;margin:0 0 22px}
input{width:100%;padding:11px 12px;border:1px solid #d6dbe6;border-radius:8px;font-size:15px;outline:none}input:focus{border-color:#1f6feb}
button{margin-top:14px;width:100%;padding:11px;border:0;border-radius:8px;background:#1f6feb;color:#fff;font-size:15px;cursor:pointer}
.err{color:#d33;font-size:13px;min-height:18px;margin-top:10px}