/* 基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #f9fafb;
            color: #1f2937;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 导航栏样式 */
        header {
            background-color: #ffffff;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 20px;
            font-weight: bold;
            color: #2563eb;
            text-decoration: none;
        }
        
        .logo-icon {
            color: #f59e0b;
            margin-right: 10px;
        }
        
        .nav-links {
            display: flex;
            gap: 25px;
        }
        
        .nav-links a {
            color: #4b5563;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: #2563eb;
        }
        
        .menu-toggle {
            display: none;
            font-size: 24px;
            cursor: pointer;
        }
        
        /* 英雄区域样式 */
        .hero {
            background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
        }
        
        .hero h1 {
            font-size: 36px;
            margin-bottom: 20px;
        }
        
        .hero p {
            font-size: 18px;
            max-width: 800px;
            margin: 0 auto;
            opacity: 0.9;
        }
        
        /* 排行榜区域样式 */
        .ranking-section {
            padding: 40px 0;
        }
        
        .section-title {
            text-align: center;
            font-size: 30px;
            margin-bottom: 40px;
            color: #1f2937;
            position: relative;
        }
        
        .section-title::after {
            content: "";
            display: block;
            width: 80px;
            height: 4px;
            background-color: #3b82f6;
            margin: 15px auto;
            border-radius: 2px;
        }
        
        .platform-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
            gap: 30px;
            margin-bottom: 50px;
        }
        
        .platform-card {
            background-color: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s, box-shadow 0.3s;
            position: relative;
        }
        
        .platform-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
        }
        
        .rank-badge {
            position: absolute;
            top: 0;
            left: 0;
            background: linear-gradient(135deg, #f59e0b, #d97706);
            color: white;
            padding: 5px 15px;
            font-weight: bold;
            font-size: 18px;
            z-index: 10;
        }
        
        .platform-header {
            background: linear-gradient(135deg, #f3f4f6, #e5e7eb);
            padding: 20px;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .platform-logo {
            width: 60px;
            height: 60px;
            background-color: #ffffff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: #3b82f6;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }
        
        .platform-info h3 {
            font-size: 20px;
            margin-bottom: 5px;
        }
        
        .rating {
            color: #f59e0b;
            font-size: 16px;
        }
        
        .platform-body {
            padding: 20px;
        }
        
        .platform-desc {
            margin-bottom: 15px;
            color: #4b5563;
        }
        
        .feature-list {
            list-style-type: none;
            margin-bottom: 20px;
        }
        
        .feature-list li {
            padding: 5px 0;
            display: flex;
            align-items: center;
        }
        
        .feature-list li::before {
            content: "✓";
            color: #10b981;
            font-weight: bold;
            margin-right: 10px;
        }
        
        .platform-footer {
            padding: 15px 20px;
            background-color: #f9fafb;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .btn {
            display: inline-block;
            padding: 8px 16px;
            background-color: #3b82f6;
            color: white;
            text-decoration: none;
            border-radius: 5px;
            transition: background-color 0.3s;
            border: none;
            cursor: pointer;
            font-size: 14px;
        }
        
        .btn:hover {
            background-color: #2563eb;
        }
        
        .btn-secondary {
            background-color: #6b7280;
        }
        
        .btn-secondary:hover {
            background-color: #4b5563;
        }
        
        /* 使用指南样式 */
        .guide-section {
            padding: 40px 0;
            background-color: #ffffff;
            margin: 40px 0;
        }
        
        .guide-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 30px;
        }
        
        .guide-step {
            text-align: center;
            padding: 20px;
        }
        
        .step-number {
            width: 40px;
            height: 40px;
            background-color: #3b82f6;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-weight: bold;
        }
        
        /* FAQ区域样式 */
        .faq-section {
            padding: 40px 0;
        }
        
        .faq-item {
            margin-bottom: 15px;
            border-radius: 8px;
            overflow: hidden;
            background-color: white;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
        }
        
        .faq-question {
            padding: 15px 20px;
            background-color: #f3f4f6;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
        }
        
        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s, padding 0.3s;
        }
        
        .faq-answer.active {
            padding: 15px 20px;
            max-height: 500px;
        }
        
        /* 页脚样式 */
        footer {
            background-color: #1f2937;
            color: white;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-column h3 {
            font-size: 18px;
            margin-bottom: 20px;
            color: #f59e0b;
        }
        
        .footer-links {
            list-style-type: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #d1d5db;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: #3b82f6;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #374151;
            color: #9ca3af;
            font-size: 14px;
        }
        
        /* 回到顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 45px;
            height: 45px;
            background-color: #3b82f6;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s, visibility 0.3s;
            z-index: 100;
        }
        
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: white;
                padding: 20px;
                box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            }
            
            .nav-links.active {
                display: flex;
            }
            
            .menu-toggle {
                display: block;
            }
            
            .hero h1 {
                font-size: 28px;
            }
            
            .section-title {
                font-size: 24px;
            }
            
            .platform-list {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 480px) {
            .hero {
                padding: 40px 0;
            }
            
            .hero h1 {
                font-size: 24px;
            }
            
            .hero p {
                font-size: 16px;
            }
        }