/* responsive.css - 响应式样式 */
/* 移动设备 (最大宽度: 767px) */
@media (max-width: 767px) {
    /* 头部导航移动端适配 */
    .header-content {
        flex-wrap: wrap;
    }
    
    .main-nav {
        order: 3;
        width: 100%;
        margin-top: 15px;
        display: none;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .nav-list {
        flex-direction: column;
        gap: 0;
    }
    
    .nav-list li {
        width: 100%;
    }
    
    .nav-list a {
        display: block;
        padding: 12px 15px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-list a.active::after {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    /* 搜索区域移动端适配 */
    .search-btn {
        position: static;
        width: 100%;
        margin-top: 10px;
        left: 0;
    }
    
    .hot-keywords {
        display: none;
    }
    
    /* APP网格移动端适配 */
    .apps-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .app-card {
        flex-direction: column;
        padding: 15px;
    }
    
    .app-icon {
        margin-right: 0;
        margin-bottom: 15px;
        text-align: center;
    }
    
    .app-icon img {
        width: 60px;
        height: 60px;
        margin: 0 auto;
    }
    
    .app-meta {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    /* 分类网格移动端适配 */
    .category-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    /* 更新列表移动端适配 */
    .update-item {
        flex-direction: column;
    }
    
    .update-date {
        margin-right: 0;
        margin-bottom: 10px;
        min-width: auto;
        align-self: flex-start;
    }
    
    /* 内页APP头部移动端适配 */
    .app-header {
        flex-direction: column;
        padding: 20px;
        text-align: center;
    }
    
    .app-icon-large {
        margin-right: 0;
        margin-bottom: 20px;
    }
    
    .app-icon-large img {
        width: 120px;
        height: 120px;
        margin: 0 auto;
    }
    
    .app-meta-detail {
        justify-content: center;
        gap: 10px;
    }
    
    .app-actions-large {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    /* 下载信息移动端适配 */
    .download-info {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    /* 相关APP推荐移动端适配 */
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    /* 底部移动端适配 */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-section {
        text-align: center;
    }
    
    .footer-section h3::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    /* 回到顶部按钮移动端适配 */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
}

/* 平板设备 (768px - 991px) */
@media (min-width: 768px) and (max-width: 991px) {
    .apps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-info {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .related-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 小桌面设备 (992px - 1199px) */
@media (min-width: 992px) and (max-width: 1199px) {
    .apps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .related-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* 高DPI屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .app-icon img,
    .app-icon-large img,
    .related-card img {
        image-rendering: -webkit-optimize-contrast;
    }
}

/* 打印样式 */
@media print {
    .site-header,
    .search-section,
    .app-actions-large,
    .btn-download,
    .btn-primary,
    .footer-bottom,
    .back-to-top {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        color: #000;
        background: white;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
    
    .container {
        max-width: 100%;
        padding: 0;
    }
    
    .app-header,
    .app-description-section,
    .download-section,
    .faq-section,
    .related-apps {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}