*{box-sizing:border-box}html,body{margin:0;height:100%;background:radial-gradient(circle at 50% 20%,#273043,#0e1117 75%);
color:#eef1f6;font-family:-apple-system,"Segoe UI",Helvetica,Arial,sans-serif;display:flex;align-items:center;justify-content:center}
.panel{width:min(400px,92vw);background:rgba(20,24,32,.82);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:28px 30px 24px}
h1{margin:0 0 4px;font-size:1.4rem}.subtitle{margin:0 0 18px;color:#9aa4b6;font-size:.92rem}.err{color:#ff8a8d;margin:0 0 12px}
input{width:100%;padding:11px 12px;border-radius:8px;border:1px solid rgba(255,255,255,.15);background:#171b24;color:#fff;font-size:16px}
button{margin-top:12px;width:100%;padding:11px 16px;border:0;border-radius:10px;background:#2ecc71;color:#fff;font-weight:700;font-size:1rem;cursor:pointer}