body {  
            font-family: Arial, sans-serif;  
            background: url('../picture/听雪集序2.webp') no-repeat center center fixed;  
            background-size: cover;  
            display: flex;  
            justify-content: center;  
            align-items: center;  
            height: 100vh;  
            margin: 0;  
        }  
        .container {  
            background: rgba(255, 255, 255, 0.8);  
            padding: 20px;  
            border-radius: 8px;  
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3), 0 0 0 1px #ccc;  
            max-width: 400px;  
            width: 100%;  
        }  
        .container h2 {  
            margin: 0 0 20px;  
            font-size: 24px;  
            color: #333;  
        }  
        .container label {  
            display: block;  
            margin: 10px 0 5px;  
            font-weight: bold;  
            color: #333;  
        }  
        .container .input-group {  
            position: relative;  
            margin-bottom: 15px;  
        }  
        .container input {  
            width: calc(100% - 22px);  
            padding: 10px;  
            border: 1px solid #ccc;  
            border-radius: 4px;  
            background-color: #f9f9f9;  
        }  
        .container .toggle-password {  
            position: absolute;  
            right: 10px;  
            top: 50%;  
            transform: translateY(-50%);  
            cursor: pointer;  
            color: #333;  
        }  
        .container button {  
            width: 100%;  
            padding: 10px;  
            background-color: #555;  
            border: none;  
            color: white;  
            font-size: 16px;  
            border-radius: 4px;  
            cursor: pointer;  
            transition: background-color 0.3s ease;  
        }  
        .container button:hover {  
            background-color: #444;  
        }  
        .error-message, .success-message {  
            margin-bottom: 15px;  
        }  
        .error-message { color: red; }  
        .success-message { color: green; }  
        .register-link, .forgot-password-link {  
            color: #555;  
            cursor: pointer;  
            text-decoration: underline;  
            display: block;  
            text-align: center;  
            margin-top: 10px;  
        }  
        .modal {  
            display: none;  
            position: fixed;  
            z-index: 1;  
            left: 0;  
            top: 0;  
            width: 100%;  
            height: 100%;  
            overflow: auto;  
            background-color: rgba(0, 0, 0, 0.5);  
            justify-content: center;  
            align-items: center;  
        }  
        .modal-content {  
            background-color: #fff;  
            padding: 20px;  
            border-radius: 10px;  
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);  
            width: 80%;  
            max-width: 400px;  
            position: relative;  
            border-left: 5px solid #4a90e2; /* Aesthetic border */  
        }  
        .modal-content h2 {  
            color: #4a90e2;  
            margin-bottom: 15px;  
        }  
        .close {  
            position: absolute;  
            top: 10px;  
            right: 15px;  
            color: #aaa;  
            font-size: 28px;  
            font-weight: bold;  
            cursor: pointer;  
            transition: color 0.3s ease;  
        }  
        .close:hover,  
        .close:focus { color: #000; }  
        .modal label {  
            display: block;  
            margin: 10px 0 5px;  
            font-weight: bold;  
            color: #333;  
        }  
        .modal .input-group {  
            position: relative;  
            margin-bottom: 15px;  
        }  
        .modal input {  
            width: calc(100% - 22px);  
            padding: 10px;  
            border: 1px solid #ccc;  
            border-radius: 4px;  
            background-color: #f9f9f9;  
        }  
        .modal .toggle-password {  
            position: absolute;  
            right: 10px;  
            top: 50%;  
            transform: translateY(-50%);  
            cursor: pointer;  
            color: #333;  
        }  
        .modal button {  
            width: 100%;  
            padding: 10px;  
            background-color: #4a90e2;  
            border: none;  
            color: white;  
            font-size: 16px;  
            border-radius: 4px;  
            cursor: pointer;  
            transition: background-color 0.3s ease;  
        }  
        .modal button:hover {  
            background-color: #357abd;  
        }