:root {
            --primary-color: #2563eb;
            --secondary-color: #0d47a1;
            --accent-color: #10b981;
            --accent-secondary: #7c3aed;
            --text-color: #1e293b;
            --light-bg: #f8fafc;
            --dark-bg: #0f172a;
            --white: #ffffff;
            --gray: #e2e8f0;
            --gray-light: #f1f5f9;
            --border-color: #cbd5e1;
            --success-color: #10b981;
            --danger-color: #ef4444;
            --warning-color: #f59e0b;
            --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --line-color: #10b981;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
            -webkit-tap-highlight-color: transparent;
        }

        body {
            background-color: var(--light-bg);
            color: var(--text-color);
            font-size: 16px;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            text-decoration: none;
            color: var(--primary-color);
        }

        .app-container {
            max-width: 100%;
            margin: 0 auto;
            position: relative;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .app-header {
            background-color: var(--white);
            padding: 15px 20px;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .app-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }

        .app-logo span {
            color: var(--accent-color);
        }

        .app-logo-icon {
            margin-right: 8px;
            font-size: 24px;
        }

        .app-content {
            flex: 1;
            padding: 20px;
            padding-bottom: 80px;
            max-width: 1000px;
            margin: 0 auto;
        }

        .bottom-nav {
            background-color: var(--white);
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.1);
            z-index: 100;
        }

        .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 10px 0;
            color: #64748b;
        }

        .nav-item.active {
            color: var(--primary-color);
        }

        .nav-icon {
            font-size: 20px;
            margin-bottom: 4px;
        }

        .nav-label {
            font-size: 12px;
            font-weight: 500;
        }

        .toc {
            background: var(--gray-light);
            padding: 20px;
            border-radius: 8px;
            margin: 30px 0;
        }
        
        .toc h2 {
            font-size: 20px;
            margin-top: 0;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .toc ul {
            padding-left: 20px;
        }
        
        .toc li {
            margin-bottom: 8px;
        }
        
        .toc a {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .toc a:hover {
            text-decoration: underline;
        }
        
        section {
            margin: 40px 0;
        }
        
        h2 {
            font-size: 24px;
            border-left: 4px solid var(--primary-color);
            padding-left: 15px;
            margin: 30px 0 20px;
            color: var(--dark-bg);
        }
        
        h3 {
            font-size: 20px;
            color: var(--dark-bg);
            margin: 25px 0 15px;
        }
        
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
        }
        
        th, td {
            padding: 12px 15px;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        
        th {
            background-color: var(--gray-light);
            color: var(--text-color);
        }
        
        tr:nth-child(even) {
            background-color: var(--white);
        }
        
        .comparison-table {
            overflow-x: auto;
        }
        
        .pros-cons {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin: 20px 0;
        }
        
        .pros, .cons {
            flex: 1;
            min-width: 300px;
            padding: 20px;
            border-radius: 8px;
        }
        
        .pros {
            background-color: rgba(16, 185, 129, 0.1);
            border-left: 4px solid var(--success-color);
        }
        
        .cons {
            background-color: rgba(239, 68, 68, 0.1);
            border-left: 4px solid var(--danger-color);
        }
        
        .pros h3, .cons h3 {
            margin-top: 0;
            color: var(--dark-bg);
        }
        
        .pros ul, .cons ul {
            padding-left: 20px;
            margin-bottom: 0;
        }
        
        .cta-button {
            display: block;
            width: 90%;
            max-width: 500px;
            padding: 15px 20px;
            margin: 30px auto;
            background-color: var(--success-color);
            color: white;
            text-align: center;
            text-decoration: none;
            font-weight: bold;
            border-radius: 5px;
            transition: background-color 0.3s;
        }
        
        .cta-button:hover {
            background-color: #059669;
        }
        
        .review {
            background-color: var(--gray-light);
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
        }
        
        .review-positive {
            border-left: 3px solid var(--success-color);
        }
        
        .review-negative {
            border-left: 3px solid var(--danger-color);
        }
        
        .step {
            background-color: rgba(37, 99, 235, 0.1);
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
            position: relative;
        }
        
        .step-number {
            display: inline-block;
            width: 25px;
            height: 25px;
            background-color: var(--primary-color);
            color: white;
            text-align: center;
            border-radius: 50%;
            margin-right: 10px;
        }
        
        .faq {
            margin-bottom: 20px;
        }
        
        .faq-question {
            font-weight: bold;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        
        .faq-answer {
            margin-left: 20px;
        }
        
        .rating {
            font-size: 24px;
            color: var(--warning-color);
            margin-bottom: 10px;
        }
        
        .rating-category {
            display: flex;
            align-items: center;
            margin-bottom: 8px;
        }
        
        .rating-name {
            width: 200px;
            font-weight: bold;
        }
        
        .image-container {
            margin: 20px 0;
            text-align: center;
        }
        
        img {
            max-width: 100%;
            height: auto;
            border-radius: 5px;
        }
        
        .alert {
            background-color: rgba(245, 158, 11, 0.1);
            border-left: 4px solid var(--warning-color);
            padding: 15px;
            margin: 20px 0;
            border-radius: 4px;
        }
        
        .recommend-box {
            background-color: rgba(16, 185, 129, 0.1);
            padding: 20px;
            border-radius: 8px;
            margin: 20px 0;
        }
        
        .not-recommend-box {
            background-color: rgba(239, 68, 68, 0.1);
            padding: 20px;
            border-radius: 8px;
            margin: 20px 0;
        }
        
        footer {
            margin-top: 50px;
            padding: 20px 0;
            border-top: 1px solid var(--border-color);
            text-align: center;
            color: #64748b;
            font-size: 14px;
        }
        
        @media (max-width: 767px) {
            .pros-cons {
                flex-direction: column;
            }
            
            .pros, .cons {
                min-width: auto;
            }
            
            h2 {
                font-size: 20px;
            }
            
            h3 {
                font-size: 18px;
            }
        }