/* ========== Tablet (max-width: 992px) ========== */
@media (max-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .about-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .culture-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-intro {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* ========== Mobile Landscape (max-width: 768px) ========== */
@media (max-width: 768px) {
  /* Top Bar */
  .top-bar {
    display: none;
  }

  /* Navigation */
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--white);
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    display: none;
    gap: 0;
  }

  .nav-menu.show {
    display: flex;
  }

  .nav-menu li a {
    padding: 12px 20px;
    border-bottom: 1px solid var(--gray-border);
  }

  /* Hero */
  .hero {
    height: 420px;
  }

  .hero-content h1 {
    font-size: 28px;
  }

  .hero-content p {
    font-size: 15px;
  }

  .hero-buttons {
    flex-direction: column;
    gap: 10px;
  }

  .btn-lg {
    padding: 12px 24px;
    font-size: 15px;
  }

  /* Sections */
  .section-title h2 {
    font-size: 24px;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-section,
  .products-section,
  .cases-section,
  .news-section {
    padding: 50px 0;
  }

  .product-card-img {
    height: 180px;
  }

  .news-side-item {
    flex-direction: column;
    gap: 8px;
  }

  .partner-logos img {
    height: 28px;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  /* Timeline */
  .timeline::before {
    left: 30px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    flex-direction: row;
  }

  .timeline-year {
    width: 60px;
    font-size: 16px;
    text-align: left;
  }

  .timeline-dot {
    left: 30px;
  }

  .timeline-content {
    max-width: none;
    flex: 1;
  }

  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    margin-left: 50px;
    margin-right: 0;
  }

  /* Culture */
  .culture-grid {
    grid-template-columns: 1fr 1fr;
  }

  /* News list */
  .news-list-item {
    flex-direction: column;
  }

  .news-list-img {
    width: 100%;
    height: 180px;
  }

  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
  }

  /* Page banner */
  .page-banner {
    padding: 40px 0;
  }

  .page-banner h1 {
    font-size: 26px;
  }

  .filter-tabs button {
    padding: 6px 14px;
    font-size: 13px;
  }
}

/* ========== Small Mobile (max-width: 480px) ========== */
@media (max-width: 480px) {
  .product-grid {
    grid-template-columns: 1fr;
  }

  .case-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    height: 360px;
  }

  .hero-content h1 {
    font-size: 24px;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .stat-item h3 {
    font-size: 24px;
  }

  .culture-grid {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 14px;
  }
}