body {
            font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
            background-color: #e5e5e5;
            background-image: linear-gradient(to bottom, #d0d0d0, #eaeaea);
            margin: 0;
            padding: 0;
            color: #333;
            -webkit-text-size-adjust: none;
            min-height: 100vh;
        }
        
        .container {
            max-width: 500px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .header {
            background-color: #2d2d2d;
            background-image: linear-gradient(to bottom, #4a4a4a, #2d2d2d);
            color: white;
            padding: 14px 20px;
            font-size: 18px;
            font-weight: bold;
            text-align: center;
            border-radius: 10px 10px 0 0;
            border: 2px solid #111; /* 加粗边框 */
            border-bottom: none;
            text-shadow: 0 -1px 0 rgba(0,0,0,0.5);
            box-shadow: inset 0 1px 0 rgba(255,255,255,0.15);
        }
        
        .content {
            background-color: #f9f9f9;
            background-image: linear-gradient(to bottom, #f9f9f9, #f0f0f0);
            padding: 20px;
            border-radius: 0 0 10px 10px;
            border: 2px solid #999; /* 加粗边框 */
            border-top: none;
            box-shadow: 0 3px 6px rgba(0,0,0,0.1);
        }
        
        .button-card {
            display: block;
            margin-bottom: 15px;
            border-radius: 8px;
            background: #f0f0f0;
            border: 2px solid #999; /* 加粗边框 */
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
            overflow: hidden;
            transition: all 0.2s ease;
            text-decoration: none; /* 去掉下划线 */
        }
        
        .button-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.15);
        }
        
        .button-main {
            display: block;
            background-color: #3a7bbd;
            background-image: linear-gradient(to bottom, #4d8fd6, #3a7bbd);
            color: white;
            text-decoration: none; /* 去掉下划线 */
            text-align: center;
            padding: 14px 15px;
            font-weight: bold;
            border: none;
            border-bottom: 2px solid #2a5a8c; /* 加粗边框 */
            text-shadow: 0 -1px 0 rgba(0,0,0,0.3);
            box-shadow: inset 0 1px 0 rgba(255,255,255,0.2);
            position: relative;
        }
        
        .button-main:active {
            background-image: linear-gradient(to bottom, #3a7bbd, #2a5a8c);
        }
        
        .button-footer {
            font-size: 12px;
            color: #555;
            text-align: center;
            padding: 10px 15px;
            background: #f9f9f9;
            border-top: 2px solid #ddd; /* 加粗边框 */
            text-shadow: 0 1px 0 rgba(255,255,255,0.8);
            text-decoration: none; /* 去掉下划线 */
        }
        
        /* 新增备用按钮样式 */
        .backup-buttons {
            display: flex;
            justify-content: space-around;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .backup-btn {
            display: inline-block;
            padding: 8px 16px;
            background-color: #e5e5e5;
            color: #333;
            text-decoration: none;
            border-radius: 4px;
            font-size: 14px;
            margin: 5px;
            flex: 1;
            max-width: 30%;
            text-align: center;
            box-sizing: border-box;
        }
        .backup-btn:hover {
            background-color: #e0e0e0;
        }
        @media (max-width: 480px) {
            .backup-buttons {
                flex-direction: column;
            }
            .backup-btn {
                max-width: 100%;
                margin-bottom: 10px;
            }
        }
        
        .icon {
            width: 70px;
            height: 70px;
            margin: 0 auto 20px;
            display: block;
            background-color: #3a7bbd;
            background-image: linear-gradient(to bottom, #4d8fd6, #3a7bbd);
            border-radius: 14px;
            color: white;
            font-size: 40px;
            text-align: center;
            line-height: 70px;
            border: 2px solid #2a5a8c; /* 加粗边框 */
            box-shadow: inset 0 1px 0 rgba(255,255,255,0.2), 0 3px 5px rgba(0,0,0,0.2);
            text-shadow: 0 -1px 0 rgba(0,0,0,0.3);
        }
        
        .warning {
            color: #d32323;
            font-weight: bold;
            margin: 20px 0;
            padding: 12px;
            background-color: #ffecec;
            border: 2px solid #ff9e9e; /* 加粗边框 */
            border-radius: 8px;
            text-shadow: 0 1px 0 rgba(255,255,255,0.5);
            box-shadow: inset 0 1px 0 rgba(255,255,255,0.5);
            text-align: center;
            text-decoration: none; /* 去掉下划线 */
        }
        
        h2 {
            text-align: center;
            margin: 0 0 15px 0;
            color: #222;
            text-shadow: 0 1px 0 rgba(255,255,255,0.8);
            font-size: 22px;
            text-decoration: none; /* 去掉下划线 */
        }
        
        .intro-text {
            text-align: center;
            margin: 0 0 20px 0;
            line-height: 1.5;
            color: #555;
            text-decoration: none; /* 去掉下划线 */
        }
        
        .footer {
            text-align: center;
            font-size: 11px;
            color: #777;
            margin-top: 25px;
            text-shadow: 0 1px 0 rgba(255,255,255,0.8);
            line-height: 1.4;
            text-decoration: none; /* 去掉下划线 */
        }