/* 响应式设计 - 平板设备 (768px 及以下) */
@media (max-width: 768px) {
    .header-container {
        padding: 15px;
    }
    
    nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--white);
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        padding: 20px;
        transform: translateY(-150%);
        transition: transform 0.3s ease;
        z-index: 99;
    }
    
    nav.active {
        transform: translateY(0);
    }
    
    nav ul {
        flex-direction: column;
    }
    
    nav ul li {
        margin: 10px 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .features-grid, .platform-cards, .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card, .platform-card {
        padding: 20px;
    }
}

/* 响应式设计 - 手机设备 (480px 及以下) */
@media (max-width: 480px) {
    .logo-text {
        font-size: 20px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .btn {
        padding: 10px 20px;
    }
    
    .btn-large {
        padding: 12px 25px;
        font-size: 16px;
    }
    
    .features, .download-section, .faq {
        padding: 60px 0;
    }
    
    .feature-icon {
        font-size: 32px;
    }
    
    .platform-card i {
        font-size: 40px;
    }
}