/* ============================================
   Responsive Styles
   ============================================ */

/* Tablet: 768px - 1024px */
@media (max-width: 1024px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.7rem; }

  .section { padding: 60px 0; }
  .section-header { margin-bottom: 40px; }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

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

  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .tech-detail {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .tech-detail:nth-child(even) {
    direction: ltr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

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

/* Mobile: < 768px */
@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.2rem; }

  .section { padding: 50px 0; }
  .section-header { margin-bottom: 30px; }
  .section-header h2 { font-size: 1.6rem; }

  /* Navigation */
  .menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: #fff;
    flex-direction: column;
    padding: 80px 30px 30px;
    box-shadow: -4px 0 30px rgba(0,0,0,0.1);
    transition: right 0.3s ease;
    gap: 4px;
    align-items: stretch;
    z-index: 999;
  }

  .nav-menu.open {
    right: 0;
  }

  .nav-menu a {
    padding: 12px 16px;
    font-size: 1rem;
    border-bottom: 1px solid var(--color-border);
  }

  .header-phone {
    display: none;
  }

  /* Hero */
  .hero {
    min-height: 500px;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-content .hero-subtitle {
    font-size: 1rem;
    letter-spacing: 1px;
  }

  .hero-content .hero-tags {
    gap: 8px;
  }

  .hero-content .hero-tag {
    font-size: 0.85rem;
    padding: 4px 14px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

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

  .stat-number {
    font-size: 2.2rem;
  }

  /* Cards */
  .business-grid,
  .products-grid,
  .patent-grid,
  .cases-grid {
    grid-template-columns: 1fr;
  }

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

  /* Page Banner */
  .page-banner {
    height: 250px;
  }

  .page-banner-content h1 {
    font-size: 1.8rem;
  }

  /* Timeline */
  .timeline::before {
    left: 20px;
  }

  .timeline-item,
  .timeline-item:nth-child(even) {
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 50px;
  }

  .timeline-item::before {
    left: 20px;
  }

  .timeline-content {
    max-width: 100%;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  /* Form */
  .form-row {
    grid-template-columns: 1fr;
  }

  /* Partners */
  .partners-logos {
    gap: 16px;
  }

  .partner-item {
    min-width: 140px;
    padding: 14px 20px;
  }

  /* Logo */
  .logo img {
    height: 36px;
    width: 36px;
  }

  .logo-text .company-name {
    font-size: 1rem;
  }

  .logo-text .company-sub {
    font-size: 0.6rem;
  }
}

/* Small mobile: < 480px */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero-content h1 {
    font-size: 1.6rem;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .stat-item {
    padding: 14px 10px;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  .team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .org-level {
    flex-direction: column;
    align-items: center;
  }
}