:root {
            --primary: #4a6bff;
            --secondary: #6c757d;
            --success: #28a745;
            --light: #f8f9fa;
            --dark: #343a40;
            --gray: #e9ecef;
            --red:#e74c3c;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f5f7fb;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .logo-icon {
            color: var(--primary);
            font-size: 28px;
        }
        
        .logo-text {
            font-size: 24px;
            font-weight: 700;
            color: var(--dark);
        }
        
        .logo-text span {
            color: var(--primary);
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        
        nav a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            font-size: 17px;
            padding: 8px 0;
            transition: color 0.3s;
            position: relative;
        }
        
        nav a:hover, nav a.active {
            color: var(--primary);
        }
        
        nav a.active:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: var(--primary);
            border-radius: 3px;
        }
        
        .hero {
            background: linear-gradient(135deg, #4a6bff 0%, #3a56e8 100%);
            color: white;
            padding: 80px 0;
            text-align: center;
            border-radius: 0 0 40px 40px;
            margin-bottom: 40px;
        }
        
        .hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
        }
        
        .hero p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }

	.btn {
    	    width: 33%;
    	    padding: 12px 25px;
    	    border: none;
    	    border-radius: 8px;
    	    font-size: 1rem;
    	    font-weight: 600;
    	    cursor: pointer;
    	    transition: all 0.3s;
    	    align-items: center;
    	    justify-content: center;
    	    gap: 8px;
    	    flex: 1;
	}

	.btn:disabled {
    	    opacity: 0.6;
    	    cursor: not-allowed;
    	    transform: none !important;
    	    box-shadow: none !important;
	}
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }
        
        .btn-primary {
            background-color: var(--primary);
            color: white;
        }
        
        .btn-success {
            background-color: var(--success);
            color: white;
        }
        
        .btn-download {
            background-color: #17a2b8;
            color: white;
        }
        
        .tabs-container {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            margin-bottom: 40px;
        }
        
        .tabs-header {
            display: flex;
            background-color: var(--gray);
            border-bottom: 1px solid #dee2e6;
            overflow-x: auto;
        }
        
        .tab-btn {
            padding: 20px 30px;
            background: none;
            border: none;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            color: var(--secondary);
            transition: all 0.3s;
            min-width: 140px;
            text-align: center;
            white-space: nowrap;
        }
        
        .tab-btn:hover {
            background-color: rgba(255, 255, 255, 0.7);
        }
        
        .tab-btn.active {
            background-color: white;
            color: var(--primary);
            border-bottom: 3px solid var(--primary);
        }
        
        .tab-content {
            display: none;
            padding: 40px;
        }
        
        .tab-content.active {
            display: block;
        }
        
        .tab-content h2 {
            font-size: 2rem;
            margin-bottom: 20px;
            color: var(--dark);
        }
        
        .tab-content h3 {
            font-size: 1.5rem;
            margin: 30px 0 15px;
            color: var(--dark);
        }
       
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }
        
        .feature {
            background-color: var(--light);
            padding: 25px;
            border-radius: var(--border-radius);
            border-left: 4px solid var(--primary);
        }
        
        .feature i {
            color: var(--primary);
            font-size: 28px;
            margin-bottom: 15px;
        }
        
        .feature h4 {
            margin-bottom: 10px;
            font-size: 1.2rem;
        }
        
        .registration-form {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .form-group {
            margin-bottom: 25px;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        
        .form-control {
            width: 100%;
            padding: 14px;
            border: 1px solid #ced4da;
            border-radius: var(--border-radius);
            font-size: 16px;
            transition: border 0.3s;
        }
        
        .form-control:focus {
            border-color: var(--primary);
            outline: none;
        }
        
        /* 注册购买页面样式 */
	/* my style */
	.input-group {
      	    display: flex;
      	    flex-wrap: wrap;
      	    gap: 0.5rem;
	}

	.form-group input {
    	    width: 65%;
    	    padding: 12px 15px;
    	    border: 2px solid #e0e0e0;
    	    border-radius: 8px;
    	    font-size: 1rem;
    	    transition: all 0.3s;
	}

	.status { margin-top: 5px; font-size: 14px; }

	.success { color: green; }

	.error { color: red; }

	.alert {
    	    display: flex;
    	    gap: 15px;
    	    padding: 20px;
    	    border-radius: 8px;
    	    margin-top: 15px;
    	    margin-bottom: 15px;
    	    align-items: flex-start;
    	    animation: fadeIn 0.5s;
	}

	.alert-success {
    	    background-color: #d5edda;
    	    color: #155724;
	}

	.alert-danger {
    	    background-color: #f8d7da;
    	    color: #721c24;
	}

	.alert-icon {
    	    font-size: 2rem;
	}

	.alert-success .alert-icon {
    	    color: #2ecc71;
	}

	.alert-danger .alert-icon {
    	    color: #e74c3c;
	}

	.alert-content h3 {
    	    margin-bottom: 5px;
    	    font-size: 1.2rem;
	}

	/* my style */

        .register-purchase-container {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-top: 10px;
        }
        
        .register-section {
	    width: 60%;
            min-width: 300px; 
        }
        
        .purchase-info {
	    width: 33%;
            flex: 1;
            min-width: 200px;
            background-color: var(--light);
            border-radius: var(--border-radius);
            padding: 10px; 
        }
        
        .price-display {
            text-align: center;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 1px solid #dee2e6;
        }
        
        .price {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--red);
            margin: 10px 0;
        }
        
        .payment-options {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 30px;
        }
        
        .payment-option {
            border: 2px solid var(--gray);
            border-radius: var(--border-radius);
            padding: 20px;
            text-align: center;
            width: 180px;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .payment-option:hover, .payment-option.selected {
            border-color: var(--primary);
            background-color: rgba(74, 107, 255, 0.05);
        }
        
        .payment-option i {
            font-size: 40px;
            margin-bottom: 15px;
        }
        
        .alipay-icon {
            color: #00a0e9;
        }
        
        .wechatpay-icon {
            color: #09bb07;
        }
        
        .payment-qrcode {
            text-align: center;
            margin-top: 40px;
            display: none;
        }
        
        .payment-qrcode.active {
            display: block;
        }
        
        .qrcode-container {
            display: inline-block;
            padding: 25px;
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin-top: 20px;
        }
        
        .qrcode-container img {
            width: 200px;
            height: 200px;
        }
    
    #loading {
      color: #666;
    }
	iframe {
      	    border: none;
            width: 600px;
      	    height: 900px;
	   /* margin-top: 20px;*/
    	}
        
	.invoice-form {
		display: none;
		background-color: white;
		border-radius: 8px;
		padding: 20px;
		margin-top: 15px;
		border: 1px solid #ddd;
		animation: fadeIn 0.3s ease;
	}
	
	.invoice-form input {
		width: 100%;
		padding: 10px;
		border: 1px solid #ddd;
		border-radius: 5px;
		font-size: 1rem;
	}
	
	.invoice-form label {
		text-align: left;
	}
	
	.required {
		color: #f5222d;
	}

        .software-screenshot {
            width: 100%;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: 25px 0;
        }
        
        /* 下载页面样式 */
        .download-options {
            display: grid;
	    /*
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
            margin-top: 40px; */
	    max-width: 100%;  /*限制整个网格最大宽度*/
	    /*
	    margin-left: auto;
	    margin-right: auto;
	    */ 
	    gap: 30px;
	    margin-top: 20px;
        }
        
        .download-card {
            border: 1px solid var(--gray);
            border-radius: var(--border-radius);
            padding: 30px;
            text-align: center;
            transition: all 0.3s;
        }
        
        .download-card:hover {
            box-shadow: var(--shadow);
            transform: translateY(-5px);
        }
        
        .download-card h4 {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        .download-card .version {
            display: inline-block;
            background-color: var(--primary);
            color: white;
            padding: 5px 15px;
            border-radius: 50px;
            font-size: 0.9rem;
            margin-bottom: 20px;
        }
        
        .download-card .file-size {
            color: var(--secondary);
            margin-bottom: 10px;
            font-size: 0.95rem;
        }
        
	.download-card .md5-code {
            color: var(--secondary);
            margin-bottom: 30px;
            font-size: 0.8rem;
        }
        
        .download-card .requirements {
            text-align: left;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid var(--gray);
        }
        
        .download-card .requirements h5 {
            margin-bottom: 10px;
            color: var(--dark);
        }
        
        .download-card .requirements ul {
            padding-left: 20px;
            color: var(--secondary);
        }
        
        .download-card .requirements li {
            margin-bottom: 5px;
        }
        
        .version-history {
            margin-top: 50px;
        }
        
        .version-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
            background-color: var(--light);
            border-radius: var(--border-radius);
            overflow: hidden;
        }
        
        .version-table th, .version-table td {
            padding: 15px;
            text-align: left;
            border-bottom: 1px solid #dee2e6;
        }
        
        .version-table th {
            background-color: var(--primary);
            color: white;
            font-weight: 600;
        }
        
        .version-table tr:last-child td {
            border-bottom: none;
        }
        
        .version-table tr:hover {
            background-color: rgba(0, 0, 0, 0.02);
        }
        
        .install-steps {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }
        
        .install-step {
            text-align: center;
            padding: 25px;
            background-color: var(--light);
            border-radius: var(--border-radius);
        }
        
        .install-step .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 20px;
        }
        
        .install-step h4 {
            margin-bottom: 10px;
            color: var(--dark);
        }
        
        /* 注册成功后的样式 */
        .register-success {
            display: none;
      	    flex-wrap: nowrap;
	    align-items: center;
	    gap: 1.5rem;
            padding: 10px;
            background-color: #d4edda;
            border-radius: var(--border-radius);
        }
        
	
        .register-success i {
            font-size: 3rem;
            color: var(--success);
        }
        
        .register-success h3 {
            color: #155724;
            margin-bottom: 5px;
        }
	
        
        .purchase-guide {
            margin-top: 30px;
            padding: 25px;
            background-color: var(--light);
            border-radius: var(--border-radius);
        }
        
        .purchase-benefits {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }
        
        .purchase-benefit {
            text-align: center;
            padding: 20px;
        }
        
        .purchase-benefit i {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        footer {
            background-color: var(--dark);
            color: white;
            /*padding: 50px 0 30px;
            margin-top: 60px;
            padding: 10px 0 10px;
            margin-top: 10px;*/
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            /*gap: 40px;
            margin-bottom: 40px;*/
            gap: 20px;
            margin-bottom: 20px;
        }
        
        .footer-section h3 {
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            padding-bottom: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.7);
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                gap: 20px;
            }
            
            nav ul {
                gap: 20px;
            }
            
            .hero h1 {
                font-size: 2.2rem;
            }
            
            .tabs-header {
                flex-direction: row;
                overflow-x: auto;
            }
            
            .tab-btn {
                min-width: 120px;
                padding: 15px 20px;
                font-size: 16px;
            }
            
            .tab-content {
                padding: 30px 20px;
            }
            
            .features, .download-options {
                grid-template-columns: 1fr;
            }
            
            .payment-options {
                flex-direction: column;
                align-items: center;
            }
            
            .install-steps, .purchase-benefits {
                grid-template-columns: 1fr;
            }
            
            .version-table {
                display: block;
                overflow-x: auto;
            }
            
            .register-purchase-container {
                flex-direction: column;
            }
        
	    /* 购买数量选择器样式 */
.quantity-selector {
    margin: 20px 0;
    padding: 15px;
    background-color: var(--light);
    border-radius: var(--border-radius);
}

.quantity-selector label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-color);
}

.quantity-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.quantity-btn {
    width: 40px;
    height: 40px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.quantity-btn:hover {
    background-color: var(--primary-dark);
}

#quantity {
    width: 80px;
    height: 60px;
   /* text-align: center; */
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0 10px;
    -moz-appearance: textfield;
}

#quantity::-webkit-outer-spin-button,
#quantity::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.quantity-presets {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.preset-label {
    font-weight: 600;
    color: var(--secondary);
}

.preset-btn {
    padding: 8px 15px;
    background-color: white;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.9rem;
}

.preset-btn:hover {
    background-color: var(--light);
    border-color: var(--primary);
}

.preset-btn.active {
    background-color: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* 总价显示样式 */
.total-price {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin: 20px 0;
    padding: 15px;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary);
}

.discount-notice {
    font-size: 0.9rem;
    color: var(--success);
    background-color: rgba(40, 167, 69, 0.1);
    padding: 8px 12px;
    border-radius: var(--border-radius);
    margin-top: 10px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.discount-notice i {
    font-size: 1rem;
}

/* 支付摘要样式 */
.payment-summary {
    background-color: var(--light);
    border-radius: var(--border-radius);
    padding: 15px;
    margin: 20px 0;
    text-align: center;
    border-left: 4px solid var(--primary);
}

.payment-summary p {
    margin: 8px 0;
    font-size: 1.1rem;
}

.payment-summary p:first-child {
    color: var(--secondary);
}

.payment-summary p:last-child {
    font-weight: 700;
    color: var(--primary-dark);
    font-size: 1.3rem;
}

.payment-amount {
    font-weight: 700;
    color: var(--primary-dark);
    font-size: 1.2rem;
    text-align: center;
    margin-top: 15px;
}

/* 注册成功页面中的购买摘要 */
.purchase-summary {
    background-color: var(--light);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-top: 20px;
    border-left: 4px solid var(--success);
}

.purchase-summary p {
    margin: 8px 0;
    font-size: 1.1rem;
}

.purchase-summary p:last-child {
    font-weight: 700;
    color: var(--primary-dark);
}