*{box-sizing:border-box}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:#f4f6f8;display:flex;align-items:center;justify-content:center;min-height:100vh;margin:0}
.box{background:#fff;padding:36px;border-radius:10px;width:340px;box-shadow:0 1px 3px rgba(0,0,0,.1)}
h1{font-size:20px;font-weight:600;margin:0 0 24px}
input{width:100%;padding:11px 13px;margin-bottom:12px;border:1px solid #d8dde2;border-radius:6px;font-size:14px}
button{width:100%;padding:11px;background:#2563eb;color:#fff;border:0;border-radius:6px;font-size:14px;cursor:pointer}
.hint{color:#8b949e;font-size:12px;margin:18px 0 0;text-align:center}