/* CSS Document */

        :root {
            --primary-color: #1a365d;
            --secondary-color: #2d5a9d;
            --accent-color: #e53e3e;
            --light-color: #f7fafc;
            --dark-color: #2d3748;
            --text-color: #4a5568;
            --border-color: #e2e8f0;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: var(--text-color);
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 40px 20px;
            text-align: center;
            border-radius: 8px;
            margin-bottom: 30px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        
        h1 {
            font-size: 2.5rem;
            margin-bottom: 15px;
        }
        
        .subtitle {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto;
        }
        
        section {
            background: white;
            border-radius: 8px;
            padding: 25px;
            margin-bottom: 25px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
            border-left: 4px solid var(--secondary-color);
        }
        
        h2 {
            color: var(--primary-color);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }
        
        h3 {
            color: var(--secondary-color);
            margin: 15px 0 10px;
        }
        
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }
        
        .service-card {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
        }
        
        .service-card h3 {
            color: var(--primary-color);
            margin-top: 0;
        }
        
        .price {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--accent-color);
            margin: 10px 0;
        }
        
        .btn {
            display: inline-block;
            background: var(--secondary-color);
            color: white;
            padding: 10px 20px;
            border-radius: 4px;
            text-decoration: none;
            font-weight: bold;
            margin: 10px 5px 0 0;
            transition: background 0.3s;
        }
        
        .btn:hover {
            background: var(--primary-color);
        }
        
        .btn-accent {
            background: var(--accent-color);
        }
        
        .btn-accent:hover {
            background: #c53030;
        }
        
        .feature-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 15px 0;
        }
        
        .feature-item {
            background: var(--light-color);
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
        }
        
        .tab-container {
            margin-top: 20px;
        }
        
        .tabs {
            display: flex;
            border-bottom: 1px solid var(--border-color);
            margin-bottom: 20px;
        }
        
        .tab {
            padding: 10px 20px;
            cursor: pointer;
            border-bottom: 3px solid transparent;
        }
        
        .tab.active {
            border-bottom: 3px solid var(--secondary-color);
            color: var(--secondary-color);
            font-weight: bold;
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
        }
        
        .accordion {
            margin-top: 15px;
        }
        
        .accordion-item {
            border: 1px solid var(--border-color);
            border-radius: 4px;
            margin-bottom: 10px;
            overflow: hidden;
        }
        
        .accordion-header {
            padding: 15px;
            background: var(--light-color);
            cursor: pointer;
            font-weight: bold;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .accordion-content {
            padding: 0 15px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s, padding 0.3s;
        }
        
        .accordion-item.active .accordion-content {
            padding: 15px;
            max-height: 1000px;
        }
        
        .advantage-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
        }
        
        .advantage-card {
            text-align: center;
            padding: 20px;
        }
        
        .advantage-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 15px;
        }
        
        footer {
            text-align: center;
            padding: 30px 0;
            margin-top: 40px;
            border-top: 1px solid var(--border-color);
            color: var(--text-color);
            font-size: 0.9rem;
        }
        
        .company-intro {
            display: flex;
            align-items: center;
            gap: 20px;
        }
        
        .company-logo {
            flex: 0 0 120px;
            height: 120px;
            background: var(--secondary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
            font-weight: bold;
        }
        
        .company-text {
            flex: 1;
        }
        
        @media (max-width: 768px) {
            .service-grid, .advantage-grid {
                grid-template-columns: 1fr;
            }
            
            h1 {
                font-size: 2rem;
            }
            
            .company-intro {
                flex-direction: column;
                text-align: center;
            }
        }