.product-card{background:white;border-radius:12px;box-shadow:0 2px 8px #0000001a;overflow:hidden;transition:transform .2s ease,box-shadow .2s ease;display:flex;flex-direction:column;height:100%}.product-card:hover{transform:translateY(-4px);box-shadow:0 4px 16px #00000026}.product-image{width:100%;height:200px;overflow:hidden;background:#f8f9fa}.product-image img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}.product-card:hover .product-image img{transform:scale(1.05)}.product-info{padding:20px;flex-grow:1;display:flex;flex-direction:column;gap:12px}.product-category{font-size:.8rem;color:#666;background:#f8f9fa;padding:4px 8px;border-radius:4px;align-self:flex-start}.product-name{font-size:1.1rem;font-weight:600;color:#333;line-height:1.4;margin:0}.product-description{font-size:.9rem;color:#666;line-height:1.4;flex-grow:1;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.product-price{font-size:1.3rem;font-weight:700;color:#1976d2}.product-stock{display:flex;justify-content:space-between;align-items:center;font-size:.9rem}.stock-label{color:#666}.stock-value{font-weight:600;color:#2e7d32}.stock-value.low-stock{color:#d32f2f}.add-to-cart-btn{background:#1976d2;color:#fff;border:none;padding:12px 20px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background-color .2s ease;margin-top:auto}.add-to-cart-btn:hover:not(:disabled){background:#1565c0}.add-to-cart-btn:disabled{background:#ccc;cursor:not-allowed;color:#666}.add-to-cart-btn:active:not(:disabled){transform:translateY(1px)}.category-menu{background:white;border-radius:12px;box-shadow:0 2px 8px #0000001a;padding:20px;height:fit-content}.menu-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px;padding-bottom:10px;border-bottom:1px solid #eee}.menu-header h3{margin:0;color:#333;font-size:1.2rem}.clear-filter{background:#ff4757;color:#fff;border:none;padding:5px 10px;border-radius:4px;font-size:.8rem;cursor:pointer;transition:background-color .2s ease}.clear-filter:hover{background:#ff3742}.categories-list{max-height:70vh;overflow-y:auto}.category-item{margin-bottom:2px}.category-header{display:flex;justify-content:space-between;align-items:center;padding:10px 15px;cursor:pointer;border-radius:6px;transition:all .2s ease;border:1px solid transparent}.category-header:hover{background:#f8f9fa;border-color:#e9ecef}.category-header.selected{background:#e3f2fd;border-color:#2196f3;color:#1976d2}.category-name{font-weight:500;font-size:.95rem;flex:1}.expand-icon{font-size:.7rem;transition:transform .2s ease;color:#666;margin-left:10px}.expand-icon.expanded{transform:rotate(90deg)}.category-children{margin-top:2px;animation:slideDown .2s ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.categories-list::-webkit-scrollbar{width:6px}.categories-list::-webkit-scrollbar-track{background:#f1f1f1;border-radius:3px}.categories-list::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:3px}.categories-list::-webkit-scrollbar-thumb:hover{background:#a8a8a8}@media (max-width: 768px){.category-menu{padding:15px}.categories-list{max-height:400px}.menu-header h3{font-size:1.1rem}}.app{max-width:1400px;margin:0 auto;padding:20px;min-height:100vh}.app-header{text-align:center;margin-bottom:30px;padding-bottom:20px;border-bottom:1px solid #eee}.app-header h1{color:#333;font-size:2.5rem;margin-bottom:10px}.current-category{font-size:1.1rem;color:#666}.app-layout{display:flex;gap:30px;align-items:flex-start}.sidebar-left{width:300px;flex-shrink:0;position:sticky;top:20px}.main-content{flex:1;min-height:400px;min-width:0}.products-info{margin-bottom:20px;padding:15px;background:#f8f9fa;border-radius:8px;color:#666;font-size:1rem}.products-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.loading,.error,.no-products{text-align:center;font-size:1.2rem;padding:50px;color:#666}.error{color:#d32f2f;background:#ffebee;border-radius:8px;border:1px solid #ffcdd2}.no-products{background:#f8f9fa;border-radius:8px;border:1px dashed #ddd}.retry-btn{background:#1976d2;color:#fff;border:none;padding:8px 16px;border-radius:4px;margin-left:10px;cursor:pointer;font-size:.9rem}.retry-btn:hover{background:#1565c0}@media (max-width: 1024px){.app-layout{gap:20px}.sidebar-left{width:280px}}@media (max-width: 768px){.app-layout{flex-direction:column;gap:20px}.sidebar-left{width:100%;position:static}.products-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:15px}.app{padding:10px}.app-header h1{font-size:2rem}}@media (max-width: 480px){.products-grid{grid-template-columns:1fr;gap:15px}.app-header h1{font-size:1.8rem}.sidebar-left{width:100%}}