body{margin:0;min-height:100vh;display:grid;place-items:center;background:#f4f7fb;color:#182230;font-family:system-ui,-apple-system,"Segoe UI",Tahoma,Arial,sans-serif;padding:20px}.card{width:min(520px,100%);background:#fff;border:1px solid #e5e7eb;border-radius:22px;padding:30px;box-shadow:0 18px 50px rgba(0,0,0,.08)}h1{margin-top:0;text-align:center}p{color:#6b7280;text-align:center}.grid{display:grid;gap:14px}label{font-weight:700}input{width:100%;box-sizing:border-box;padding:13px;border:1px solid #d1d5db;border-radius:12px;font-size:16px}button{width:100%;padding:14px;border:0;border-radius:12px;background:#0d6efd;color:#fff;font-weight:700;font-size:16px}.alert{padding:12px;border-radius:12px;margin:12px 0}.error{background:#fee2e2;color:#991b1b}.success{background:#dcfce7;color:#166534}a{color:#0d6efd;text-decoration:none;text-align:center;display:block;margin-top:16px}@media(prefers-color-scheme:dark){body{background:#0f172a;color:#e5e7eb}.card{background:#111827;border-color:#273449;box-shadow:none}p{color:#9ca3af}input{background:#0b1220;color:#fff;border-color:#374151}}