body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #f8f9fa;
        }

        .navbar {
            box-shadow: 0 2px 4px rgba(0,0,0,.1);
        }

        .hero-section {
            padding: 100px 0;
            background: linear-gradient(45deg, #2A4269, #172A4B);
            color: white;
            text-align: center;
        }
        .hero-section h1 {
            font-weight: 700;
            font-size: 3.5rem;
        }
        .hero-section p {
            font-size: 1.25rem;
            font-weight: 300;
            max-width: 700px;
            margin: 20px auto;
        }
        .cta-button {
            font-weight: 600;
            padding: 15px 30px;
            font-size: 1.2rem;
            border-radius: 50px;
            transition: all 0.3s ease;
        }
        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        }

        .section {
            padding: 80px 0;
        }

        .section-title {
            font-weight: 700;
            margin-bottom: 50px;
            text-align: center;
        }

        .feature-card {
            background-color: #ffffff;
            border-radius: 15px;
            padding: 40px 30px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: all 0.3s ease;
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.12);
        }
        .feature-icon {
            font-size: 3.5rem;
            color: #2A4269;
            margin-bottom: 20px;
        }
        .feature-card h4 {
            font-weight: 600;
            margin-bottom: 15px;
        }

        .comparison-section {
            background-color: #ffffff;
        }
        .comparison-img {
            border-radius: 8px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
            border: 1px solid #dee2e6;
            transition: transform 0.3s; /* 平滑过渡效果 */
            cursor: pointer;
        }

        .final-cta-section {
            background-color: #343a40;
            color: white;
            text-align: center;
        }

        .footer {
            background-color: #212529;
            color: #adb5bd;
            padding: 30px 0;
            text-align: center;
        }
        .footer a {
            color: #ffffff;
        }
        .footer a:hover {
            color: #0d6efd;
            text-decoration: none;
        }
        
        #lang-toggle {
            cursor: pointer;
            font-weight: 500;
        }