body {
            background-color: #f4f6f9;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
        }
        .login-container {
            background-color: #fff;
            border: 0.5px solid #000d2d;
            border-radius: 10px;
            padding: 2.2rem;
            width: 330px;
            text-align: center;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
        }
        .login-container img.logo {
            width: 120px;
            height: auto;
            margin-bottom: 1rem;
        }
        .login-container h4 {
            color: #000d2d;
            margin-bottom: 1rem;
        }
        .form-control {
            border-radius: 8px;
        }
        .btn-login {
            background-color: #000d2d;
            border: none;
            color: #fff;
            font-weight: 600;
            width: 100%;
            padding: 0.6rem;
            border-radius: 8px;
            transition: background-color 0.3s ease;
        }
        .btn-login:hover {
            background-color: #001a5a;
        }
        .flags {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin-bottom: 1rem;
        }
        .flags img {
            width: 32px;
            height: 22px;
            border: 1px solid transparent;
            cursor: pointer;
            border-radius: 4px;
            transition: transform 0.15s, border-color 0.15s;
        }
        .flags img:hover {
            transform: scale(1.08);
        }
        .flags img.active {
            border-color: #000d2d;
        }
        .error-message {
            color: red;
            margin-bottom: 1rem;
            font-size: 0.9rem;
        }