@media (max-width: 1040px) {
  .header-inner {
    grid-template-columns: auto 1fr auto;
    gap: 12px;
  }

  .main-nav {
    position: fixed;
    top: 72px;
    right: 16px;
    display: none;
    min-width: 220px;
    padding: 14px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    align-items: stretch;
    flex-direction: column;
  }

  .main-nav.open {
    display: flex;
  }

  .mobile-toggle {
    display: block;
  }

  .hero-grid,
  .detail-layout,
  .cart-layout {
    grid-template-columns: 1fr;
  }

  .brand-grid,
  .summary-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .device-grid,
  .trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .filter-bar {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 24px, 1180px);
  }

  .header-inner {
    min-height: auto;
    padding: 10px 0;
    grid-template-columns: 1fr auto;
  }

  .header-search {
    grid-column: 1 / -1;
    order: 3;
    position: sticky;
    top: 0;
  }

  .hero {
    padding: 36px 0;
  }

  .hero p {
    font-size: 16px;
  }

  .section {
    padding: 30px 0;
  }

  .section-heading,
  .page-title {
    display: block;
  }

  .brand-grid,
  .device-grid,
  .trust-grid,
  .summary-grid,
  .quick-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .filter-toggle {
    display: inline-flex;
    margin-bottom: 12px;
  }

  .filter-bar {
    display: none;
    grid-template-columns: 1fr;
  }

  .filter-bar.open {
    display: grid;
  }

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

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

  .rail-row {
    grid-template-columns: 54px 1fr;
  }

  .rail-row .badge {
    grid-column: 2;
    justify-self: start;
  }
}

@media (max-width: 460px) {
  .brand-grid,
  .device-grid,
  .trust-grid,
  .summary-grid,
  .quick-grid {
    grid-template-columns: 1fr;
  }

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

  .button-row,
  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .cart-item {
    align-items: flex-start;
    flex-direction: column;
  }
}