body {
            background: linear-gradient(135deg, #0a3d62, #3c6382);
            font-family: "Segoe UI", Tahoma, sans-serif;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .card {
            border: none;
            border-radius: 20px;
            padding: 2rem;
            background: #fff;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .card:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
        }

        h4 {
            font-weight: 600;
            margin-bottom: 1.5rem;
            color: #0a3d62;
        }

        label {
            font-weight: 500;
            color: #34495e;
        }

        .form-control {
            border-radius: 10px;
            padding: 0.75rem;
        }

        .btn-primary {
            background: #0a3d62;
            border: none;
            border-radius: 10px;
            padding: 0.75rem;
            font-weight: 600;
            transition: background 0.3s ease;
        }

        .btn-primary:hover {
            background: #3c6382;
        }

        .alert {
            border-radius: 10px;
        }