/* 
 * 响应式样式表 - NexTech 科技 
 * 移动端适配 (Desktop-First)
 */

/* ===== 平板端 (Tablet - max-width: 992px) ===== */
@media screen and (max-width: 992px) {
    /* 导航栏 */
    .nav-links {
        display: none; /* 隐藏桌面端菜单 */
    }
    
    .nav-actions {
        display: none; /* 隐藏桌面端操作按钮 */
    }
    
    .mobile-menu-btn {
        display: block; /* 显示汉堡菜单按钮 */
        z-index: 1001;
    }

    /* 移动端菜单激活状态 */
    .nav-menu.active {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--color-bg-darker);
        padding-top: 100px;
        align-items: center;
        z-index: 999;
    }

    .nav-menu.active .nav-links {
        display: flex;
        flex-direction: column;
        gap: 32px;
        align-items: center;
        width: 100%;
    }

    .nav-menu.active .nav-links a {
        font-size: 1.5rem;
    }

    /* 首页 - 首屏 */
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        max-width: 80%;
        margin: 0 auto;
    }

    /* 核心业务 */
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* 数据展示 */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }

    /* 关于我们 */
    .about-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .vision-mission {
        flex-direction: column;
    }

    /* 产品与服务 */
    .service-row, .service-row.reverse {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }
    
    .icon-box {
        margin: 0 auto 24px;
    }

    /* 新闻动态 */
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .news-card.featured {
        flex-direction: column;
    }

    /* 联系我们 */
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .contact-info-panel {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    /* 页脚 */
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-brand {
        grid-column: 1 / -1;
    }
}

/* ===== 手机端 (Mobile - max-width: 768px) ===== */
@media screen and (max-width: 768px) {
    :root {
        --spacing-2xl: 80px;
        --spacing-xl: 48px;
    }
    
    /* 字体调整 */
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }

    .page-header h1 {
        font-size: 2.5rem;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    /* 首页 - 首屏 */
    .hero-buttons {
        flex-direction: column;
        gap: 16px;
        width: 100%;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }

    .hero-image {
        max-width: 100%;
    }

    /* 核心业务 */
    .services-grid {
        grid-template-columns: 1fr;
    }

    /* 团队 */
    .team-grid {
        grid-template-columns: 1fr;
    }

    /* 新闻动态 */
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-tabs {
        flex-wrap: wrap;
    }

    /* 联系我们 */
    .form-row {
        grid-template-columns: 1fr;
    }

    /* 页脚 */
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}