/* 响应式设计 */

/* 平板设备 (768px 到 1024px) */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 36px;
    }
    
    .service-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .floating-buttons {
        right: 20px;
        bottom: 20px;
    }
    
    .floating-btn {
        min-width: 160px;
        padding: 12px 18px;
        font-size: 15px;
    }
}

/* 手机设备 (小于 768px) */
@media (max-width: 768px) {
    .header .container {
        padding: 10px 15px;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: white;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        padding: 20px;
    }
    
    .nav.active {
        display: block;
    }
    
    .nav ul {
        flex-direction: column;
    }
    
    .nav ul li {
        margin: 0 0 15px 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero h1 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .cta-buttons {
        display: flex;
        flex-direction: column;
        gap: 15px;
    }
    
    .btn-secondary {
        margin-left: 0;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .floating-buttons {
        right: 15px;
        bottom: 15px;
        flex-direction: row;
        gap: 10px;
    }
    
    .floating-btn {
        min-width: auto;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        padding: 0;
        justify-content: center;
        font-size: 0;
    }
    
    .floating-btn i {
        margin-right: 0;
        font-size: 20px;
    }
    
    .floating-btn span {
        display: none;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .services,
    .about-preview,
    .news-preview {
        padding: 60px 0;
    }
    
    .services h2,
    .about-preview h2,
    .news-preview h2 {
        font-size: 30px;
        margin-bottom: 40px;
    }
}

/* 小手机设备 (小于 480px) */
@media (max-width: 480px) {
    .hero h1 {
        font-size: 24px;
    }
    
    .hero p {
        font-size: 15px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 15px;
    }
    
    .service-card,
    .feature,
    .news-card {
        padding: 20px;
    }
    
    .service-card i {
        font-size: 40px;
    }
    
    .feature i {
        font-size: 35px;
    }
    
    .floating-buttons {
        right: 10px;
        bottom: 10px;
    }
    
    .floating-btn {
        width: 45px;
        height: 45px;
    }
    
    .floating-btn i {
        font-size: 18px;
    }
}

/* 大桌面设备 (大于 1400px) */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
}