body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(to right, #4facfe, #00f2fe);
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .login-container {
            background: white;
            padding: 40px 50px;
            border-radius: 15px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.2);
            width: 350px;
            text-align: center;
        }
        .login-container h1 {
            margin-bottom: 30px;
            color: #333;
        }
        .login-container label {
            display: block;
            text-align: left;
            margin: 10px 0 5px;
            font-weight: bold;
            color: #555;
        }
        .login-container select,
        .login-container input[type="password"] {
            width: 100%;
            padding: 10px 15px;
            margin-bottom: 20px;
            border-radius: 8px;
            border: 1px solid #ccc;
            font-size: 14px;
        }
        .login-container button {
            width: 100%;
            padding: 12px;
            background: #4facfe;
            border: none;
            color: white;
            font-size: 16px;
            font-weight: bold;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.3s;
        }
        .login-container button:hover {
            background: #00f2fe;
        }
        .error {
            color: #e74c3c;
            margin-bottom: 20px;
            font-weight: bold;
        }
        .login-logo {
            width: 80px;
            margin-bottom: 20px;
        }
        .retour-btn {
            display: inline-block;
            margin-top: 10px;
            padding: 5px 20px;
            background: #ad5227ff;
            color: white;
            font-weight: bold;
            border-radius: 8px;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .retour-btn:hover {
            background: #8a9397ff;
            transform: scale(1.05);
        }