:root {
            --primary-color: #0066cc; /* 广电蓝 */
            --accent-color: #ff6600; /* 促销橙 */
            --bg-dark: #0f172a;
            --text-light: #ffffff;
        }

        body {
            font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: var(--bg-dark);
            color: var(--text-light);
        }

        /* 首屏 */
        .hero {
            text-align: center;
            padding: 80px 20px;
            background: linear-gradient(135deg, #003366 0%, #001f3f 100%);
        }

        .hero h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
        }

        .hero p {
            font-size: 1.2rem;
            color: #ccc;
            margin-bottom: 30px;
        }

        .cta-btn {
            background-color: var(--accent-color);
            color: white;
            padding: 15px 40px;
            text-decoration: none;
            border-radius: 50px;
            font-weight: bold;
            font-size: 1.2rem;
            transition: transform 0.2s;
            display: inline-block;
        }

        .cta-btn:hover {
            transform: scale(1.05);
        }

        /* 套餐区域 */
        .pricing-section {
            padding: 50px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }

        .section-title {
            text-align: center;
            margin-bottom: 40px;
            font-size: 2rem;
        }

        .cards-container {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .card {
            background: #1e293b;
            border-radius: 15px;
            padding: 30px;
            width: 300px;
            text-align: center;
            border: 1px solid #334155;
            position: relative;
        }

        .card.popular {
            border: 2px solid var(--accent-color);
            transform: scale(1.05);
            background: #25334d;
        }

        .badge {
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent-color);
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: bold;
        }

        .price {
            font-size: 2.5rem;
            color: var(--accent-color);
            margin: 20px 0;
            font-weight: bold;
        }

        .price span {
            font-size: 1rem;
            color: #ccc;
        }

        .features-list {
            list-style: none;
            padding: 0;
            text-align: left;
            margin-bottom: 30px;
        }

        .features-list li {
            padding: 10px 0;
            border-bottom: 1px solid #334155;
        }

        .features-list li strong {
            color: white;
        }

        /* 优势区域 */
        .advantages {
            background-color: #1e293b;
            padding: 50px 20px;
            text-align: center;
        }
        
        .grid-adv {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            max-width: 1000px;
            margin: 0 auto;
        }

        .adv-item h3 {
            color: var(--primary-color);
        }

        /* 底部 */
        footer {
            text-align: center;
            padding: 20px;
            font-size: 0.8rem;
            color: #666;
        }

        @media (max-width: 768px) {
            .hero h1 { font-size: 1.8rem; }
            .card.popular { transform: none; }
        }