body { background-color: #f0f2f5; display: flex; align-items: center; justify-content: center; height: 100vh; margin: 0; }
.login-card { width: 100%; max-width: 400px; padding: 30px; border-radius: 15px; box-shadow: 0 4px 20px rgba(0,0,0,0.1); background: white; }
.logo { font-size: 2rem; font-weight: bold; color: #0d6efd; text-align: center; margin-bottom: 20px; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; }
@media (max-width: 768px) {
    .card { width: 92vw !important; max-width: 420px !important; margin: 1rem auto; padding: 1.2rem !important; }
    .card h2, .card h3 { font-size: 1.2rem; }
}
@media (max-width: 480px) {
    .card { padding: 1rem !important; }
    .card h2, .card h3 { font-size: 1.05rem; }
    .form-control { font-size: 0.85rem; }
    .btn { font-size: 0.85rem; padding: 0.5rem; }
}