body {  
            background-image: url("https://tk.illlt.com:759/个人/bj.jpg");  
            background-size: cover;  
            font-family: 'Roboto', sans-serif;  
            margin: 0;  
            padding: 0;  
            display: flex;  
            justify-content: center;  
            align-items: center;  
            height: 100vh;  
            color: #333;  
            backdrop-filter: blur(10px);
        }  
        .container {  
            background-color: rgba(255, 255, 255, 0.5); 
            border-radius: 15px;  
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);  
            padding: 40px;  
            width: 100%;  
            max-width: 400px;  
            text-align: center;  
            animation: fadeIn 1s ease-in-out; 
            position: relative; /
            overflow: hidden;
        }  
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        label {  
            display: block;  
            font-size: 18px;  
            margin-bottom: 10px;  
            color: #555;  
            font-weight: bold;  
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1); 
        }  
        input[type="password"],  
        input[type="submit"] {  
            width: 50%;
            padding: 8px;
            margin-bottom: 15px;  
            border-radius: 8px;  
            border: 1px solid #ccc;  
            font-size: 16px;  
            transition: border-color 0.3s, box-shadow 0.3s;  
            background-color: rgba(255, 255, 255, 0.9);
        }  
        input[type="password"]:focus {  
            border-color: #4CAF50;  
            box-shadow: 0 0 5px rgba(76, 175, 80, 0.5);  
        }  
        input[type="submit"] {  
            background-color: #4CAF50;  
            color: white;  
            border: none;  
            cursor: pointer;  
            transition: background-color 0.3s, transform 0.3s;  
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
        }  
        input[type="submit"]:hover {  
            background-color: #45a049;  
            transform: translateY(-2px);  
        }  
        .error, .update {  
            color: #FF0000;  
            margin-top: 10px;  
            font-size: 14px;  
            animation: shake 0.5s ease-in-out; 
        }  
        @keyframes shake {
            0%, 100% {
                transform: translateX(0);
            }
            10%, 30%, 50%, 70%, 90% {
                transform: translateX(-5px);
            }
            20%, 40%, 60%, 80% {
                transform: translateX(5px);
            }
        }
        .announcement {  
            margin-bottom: 20px;  
            padding: 15px;  
            background-color: #f9f9f9;  
            border-left: 4px solid #4CAF50;  
            border-radius: 8px;  
            text-align: left;  
            animation: slideIn 0.5s ease-in-out; 
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); 
        }  
        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(-20px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

.custom-button {
            display: inline-block;
            padding: 6px 12px;
            font-size: 10px;
            font-weight: bold;
            text-align: center;
            text-decoration: none;
            color: #ffffff;
            background-color: #4CAF50;
            border: none;
            border-radius: 8px;
            box-shadow: 0 4px #999;
            transition: background-color 0.3s, box-shadow 0.3s;
        }

        .custom-button:hover {
            background-color: #45a049;
        }

        .custom-button:active {
            background-color: #3e8e41;
            box-shadow: 0 2px #666;
            transform: translateY(2px);
        }
        
                .custom-button {
            margin-left: 10px;
            padding: 10px 20px;
            background-color: #007BFF;
            color: white;
            border: none;
            cursor: pointer;
            border-radius: 5px;
            transition: background-color 0.3s ease;
        }
        .custom-button:hover {
            background-color: #0056b3;
        }
        /* 弹窗样式 */
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.8);
            padding-top: 60px;
        }
        .modal-content {
            background-color: #fefefe;
            margin: 5% auto;
            padding: 40px;
            border: 1px solid #888;
            width: 80%;
            max-width: 600px;
            box-shadow: 0 4px 16px 0 rgba(0,0,0,0.2);
            border-radius: 15px;
            animation-name: animatetop;
            animation-duration: 0.4s;
            position: relative;
        }
        @keyframes animatetop {
            from {top: -300px; opacity: 0}
            to {top: 0; opacity: 1}
        }
        .close {
            color: #aaa;
            position: absolute;
            top: 10px;
            right: 20px;
            font-size: 36px;
            font-weight: bold;
            transition: color 0.3s ease;
        }
        .close:hover,
        .close:focus {
            color: black;
            text-decoration: none;
            cursor: pointer;
        }
        .modal-content p {
            font-size: 18px;
            line-height: 1.6;
            color: #333;
            text-align: center;
        }
        .modal-content::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(255,255,255,0.9);
            z-index: -1;
            border-radius: 15px;
        }
                /* 弹窗样式 */
        .modal {
            display: none;
            position: fixed;
            z-index: 1;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgb(0,0,0);
            background-color: rgba(0,0,0,0.4);
        }
        .modal-content {
            background-color: #fefefe;
            margin: 15% auto;
            padding: 20px;
            border: 1px solid #888;
            width: 80%;
            border-radius: 10px;
        }
        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
        }
        .close:hover,
        .close:focus {
            color: black;
            text-decoration: none;
            cursor: pointer;
        }
        /* 按钮样式 */
        .modal-button {
            padding: 10px 20px;
            margin: 10px 5px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            transition: background-color 0.3s, transform 0.3s;
        }
        .modal-button.primary {
            background-color: #4CAF50;
            color: white;
        }
        .modal-button.secondary {
            background-color: #f44336;
            color: white;
        }
        .modal-button:hover {
            background-color: #555;
            transform: scale(1.05);
        }
        
                .progress-container {
            width: 100%;
            background-color: #ddd;
            border-radius: 20px;
            margin-top: 20px;
            overflow: hidden;
            position: relative;
        }
        .progress-bar {
            width: 0%;
            height: 30px;
            background: linear-gradient(90deg, #4CAF50, #8BC34A);
            border-radius: 20px;
            text-align: center;
            line-height: 30px;
            color: white;
            transition: width 0.5s ease;
        }
        .progress-bar::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0));
            animation: progress-animation 2s linear infinite;
        }
        @keyframes progress-animation {
            0% {
                transform: translateX(-100%);
            }
            100% {
                transform: translateX(100%);
            }
        }