/* 
 * 北京堆栈矩阵科技有限公司官网 - 响应式样式表
 */

/* 大屏幕显示器 (1200px 以上) */
@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
}

/* 笔记本电脑 (992px 到 1199px) */
@media (min-width: 992px) and (max-width: 1199px) {
  .container {
    max-width: 960px;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-subtitle {
    font-size: 1.3rem;
  }
  
  .section-title {
    font-size: 2.2rem;
  }
}

/* 平板电脑 (768px 到 991px) */
@media (min-width: 768px) and (max-width: 991px) {
  .container {
    max-width: 720px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .section-subtitle {
    font-size: 1.1rem;
  }
  
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .about-image {
    order: -1;
  }
  
  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

/* 移动设备 (767px 以下) */
@media (max-width: 767px) {
  .container {
    max-width: 100%;
    padding: 0 20px;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .header-inner {
    height: 70px;
  }
  
  .logo img {
    height: 35px;
  }
  
  .logo-text {
    font-size: 1.3rem;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .nav {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: rgba(255, 255, 255, 0.98);
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 30px;
    transform: translateX(100%);
    transition: var(--transition);
    z-index: 999;
  }
  
  .nav.active {
    transform: translateX(0);
  }
  
  .nav-list {
    flex-direction: column;
    width: 100%;
    margin-right: 0;
    align-items: center;
  }
  
  .nav-item {
    margin: 10px 0;
    width: 100%;
    text-align: center;
  }
  
  .nav-link {
    display: block;
    padding: 10px 0;
    font-size: 1.1rem;
  }
  
  .hero {
    min-height: 500px;
    padding-top: 100px;
    text-align: center;
  }
  
  .hero-content {
    margin: 0 auto;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .hero-btns {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 2rem;
  }
  
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .about-image {
    order: -1;
  }
  
  .about-content h2 {
    font-size: 1.8rem;
  }
  
  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .cases-filter {
    flex-wrap: wrap;
  }
  
  .filter-btn {
    margin-bottom: 10px;
  }
  
  .cases-grid {
    grid-template-columns: 1fr;
  }
  
  .team-grid {
    grid-template-columns: 1fr;
    max-width: 300px;
    margin: 0 auto;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-links {
    margin-bottom: 20px;
  }
}

/* 小屏幕移动设备 (576px 以下) */
@media (max-width: 576px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
  }
  
  .about-content h2 {
    font-size: 1.6rem;
  }
  
  .stats {
    grid-template-columns: 1fr;
  }
  
  .stat-number {
    font-size: 2rem;
  }
  
  .contact-method {
    flex-direction: column;
    text-align: center;
  }
  
  .contact-icon {
    margin: 0 auto 15px;
  }
}