/* ======================================
   RESPONSIVE STYLES
   ====================================== */

@media (max-width: 1200px) {
  .products-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .shop-layout { grid-template-columns: 200px 1fr; gap: 24px; }
}

@media (max-width: 1024px) {
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .checkout-layout { grid-template-columns: 1fr; }
  .order-summary-sidebar { position: static; }
  .product-detail-layout { grid-template-columns: 1fr; gap: 32px; }
  .product-info-sticky { position: static; }
  .account-layout { grid-template-columns: 1fr; }
  .account-sidebar { position: static; }
  .cart-layout { grid-template-columns: 1fr; }
  .cart-summary { position: static; }
  .main-nav { display: none; }
  .hamburger { display: flex; }
  .topbar-left { display: none; }
}

@media (max-width: 768px) {
  :root { --header-h: 60px; --topbar-h: 30px; }
  .container { padding: 0 16px; }
  .section { padding: 40px 0; }
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .category-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-top { padding: 40px 0 30px; }
  .brand-col p { max-width: 100%; }
  .hero-content { padding: 60px 20px; }
  .hero-title { font-size: 28px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .cart-item { grid-template-columns: 80px 1fr; gap: 12px; }
  .cart-item > div:last-child { grid-column: 1 / -1; }
  .shop-layout { grid-template-columns: 1fr; }
  .shop-sidebar { position: static; max-height: none; display: none; }
  .shop-sidebar.open { display: block; }
  .section-header { flex-direction: column; align-items: flex-start; gap: 8px; }
  .product-detail-layout { gap: 24px; }
  .orders-table th:nth-child(4), .orders-table td:nth-child(4) { display: none; }
  .topbar-right .topbar-right > span:first-child { display: none; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
  .page-title-bar { padding: 20px 0; }
  .page-title-bar h1 { font-size: 22px; }
  .auth-card { padding: 28px 20px; }
}

@media (max-width: 480px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .product-card-info { padding: 10px; }
  .price-sale, .price-regular { font-size: 13px; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; max-width: 280px; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-arrow { display: none; }
  .checkout-layout, .cart-layout { gap: 24px; }
  .product-actions { flex-direction: column; }
  .auth-card { padding: 24px 16px; }
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  position: fixed; top: 0; left: -100%; width: 85%; max-width: 320px;
  height: 100vh; background: var(--bg-card);
  z-index: 2000; overflow-y: auto;
  transition: left 0.3s ease;
  box-shadow: var(--shadow-hover);
}
.mobile-nav-drawer.open { left: 0; }
.mobile-nav-header { background: var(--accent); color: #fff; padding: 20px 16px; display: flex; align-items: center; justify-content: space-between; }
.mobile-nav-header .logo-text { font-size: 22px; font-weight: 900; }
.mobile-nav-close { background: rgba(255,255,255,0.2); border: none; color: #fff; width: 34px; height: 34px; border-radius: 50%; font-size: 18px; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.mobile-nav-auth { padding: 16px; display: flex; gap: 8px; border-bottom: 1px solid var(--border); }
.mobile-nav-auth a { flex: 1; }
.mobile-nav-items { padding: 8px 0; }
.mobile-nav-item { border-bottom: 1px solid var(--border); }
.mobile-nav-link { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; font-size: 14px; font-weight: 700; color: var(--text); cursor: pointer; }
.mobile-nav-link i { font-size: 11px; transition: transform var(--transition); }
.mobile-nav-link.expanded i { transform: rotate(90deg); }
.mobile-nav-sub { display: none; background: var(--bg-secondary); }
.mobile-nav-sub.open { display: block; }
.mobile-nav-sub a { display: block; padding: 11px 32px; font-size: 13px; font-weight: 600; color: var(--text-muted); border-bottom: 1px solid var(--border); }
.mobile-nav-sub a:hover { color: var(--accent); }
.mobile-nav-footer { padding: 16px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; }
.mobile-nav-utility { display: flex; align-items: center; gap: 10px; padding: 10px 0; font-size: 13px; font-weight: 700; color: var(--text); cursor: pointer; border-bottom: 1px solid var(--border); }
.mobile-nav-utility i { width: 18px; color: var(--text-muted); }
.mobile-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 1999; opacity: 0; visibility: hidden; transition: all var(--transition); }
.mobile-overlay.open { opacity: 1; visibility: visible; }