:root{color-scheme:dark}*{box-sizing:border-box;margin:0}body{min-height:100vh;display:flex;align-items:center;justify-content:center;background:#0e1116;color:#dbe1ea;font:16px/1.4 -apple-system,Segoe UI,Roboto,sans-serif}.card{width:min(92vw,340px);background:#161b22;border:1px solid #232a33;border-radius:14px;padding:28px 24px}h1{font-size:20px;font-weight:600;margin-bottom:16px;text-align:center}.err{color:#f87171;font-size:14px;min-height:20px;margin-bottom:8px;text-align:center}input{width:100%;padding:12px 14px;margin-bottom:12px;border-radius:10px;border:1px solid #2b333e;background:#0e1116;color:inherit;font-size:16px}input:focus{outline:none;border-color:#3b82f6}button{width:100%;padding:12px;border:0;border-radius:10px;background:#2563eb;color:#fff;font-size:16px;cursor:pointer}button:active{opacity:.85}.hidden{display:none}