*{box-sizing:border-box}
body{margin:0;font-family:system-ui,Segoe UI,Roboto,Arial;min-height:100vh;display:grid;place-items:center;background:#f5f6f8}
.card{width:min(520px,92vw);background:#fff;padding:28px;border-radius:14px;box-shadow:0 10px 30px rgba(0,0,0,.08)}
h1{margin:0 0 8px 0;font-size:26px}
.muted{margin:0 0 18px 0;color:#666}
label{display:block;margin:12px 0 6px 0;font-weight:600}
input{width:100%;padding:10px 12px;border:1px solid #cfd5dd;border-radius:10px;font-size:16px}
.row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.btn{display:inline-block;padding:10px 12px;border-radius:10px;font-weight:700;text-decoration:none}
.btn.light{background:#eee;color:#111}
.btn.dark{background:#111;color:#fff}
button{margin-top:16px;width:100%;padding:10px 12px;border:0;border-radius:10px;font-size:16px;font-weight:700;cursor:pointer;background:#111;color:#fff}
.error{min-height:20px;margin:14px 0 0 0;color:#b00020}