:root{--primary-bg: #f4f4f5;--secondary-bg: #ffffff;--primary-text: #18181b;--secondary-text: #71717a;--accent-color: #4f46e5;--accent-hover: #4338ca;--border-color: #e4e4e7;--success-color: #22c55e;--danger-color: #ef4444;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--border-radius: .5rem}button,.control-button,.product-card{user-select:none;-webkit-user-select:none;touch-action:manipulation}.product-card{background:var(--primary-bg);border:1px solid var(--border-color);border-radius:var(--border-radius);padding:1rem;text-align:center;cursor:pointer;transition:transform .1s,box-shadow .1s,background-color .1s;display:flex;flex-direction:column;justify-content:space-between;transform:translateZ(0)}@media(hover:hover){.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);background-color:var(--accent-color);color:#fff}.product-card:hover .product-price,.product-card:hover .product-icon{color:#fff;filter:invert(1)}}.product-card:active{transform:scale(.96);background-color:#e0e0e0}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--primary-bg);color:var(--primary-text)}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-header{background-color:var(--secondary-bg);padding:1rem 2rem;border-bottom:1px solid var(--border-color);text-align:left;box-shadow:var(--shadow-sm)}.app-header h1{margin:0;font-size:1.5rem;color:var(--accent-color)}.app-header p{margin:0;color:var(--secondary-text)}.main-content{display:flex;flex-direction:column;flex-grow:1;gap:1.5rem;padding:1.5rem}.products-section{background:var(--secondary-bg);border-radius:var(--border-radius);padding:1.5rem;box-shadow:var(--shadow-md)}.products-section h2{margin-top:0;margin-bottom:1rem;font-size:1.25rem;border-bottom:1px solid var(--border-color);padding-bottom:.5rem}.products-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:1rem}.product-card{background:var(--primary-bg);border:1px solid var(--border-color);border-radius:var(--border-radius);padding:1rem;text-align:center;cursor:pointer;transition:transform .2s,box-shadow .2s;display:flex;flex-direction:column;justify-content:space-between}.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);background-color:var(--accent-color);color:#fff}.product-card:hover .product-price,.product-card:hover .product-icon{color:#fff;filter:invert(1)}.product-icon{width:48px;height:48px;margin:0 auto .75rem;transition:filter .2s}.product-name{font-weight:600;margin:0 0 .5rem;font-size:1.05rem;flex-grow:1}.product-price{color:var(--accent-color);font-weight:700;margin:0}.order-section{background:var(--secondary-bg);border-radius:var(--border-radius);padding:1.5rem;box-shadow:var(--shadow-md);display:flex;flex-direction:column}.order-section h2{margin-top:0;margin-bottom:1rem;font-size:1.25rem;border-bottom:1px solid var(--border-color);padding-bottom:.5rem}.cart-items{flex-grow:1;min-height:80px}.empty-cart-message{color:var(--secondary-text);text-align:center;padding:2rem 0}.item-price{font-weight:600;min-width:60px;text-align:right}.control-button{background-color:var(--primary-bg);border:1px solid var(--border-color);color:var(--primary-text);width:32px;height:32px;border-radius:50%;font-size:1.3rem;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;line-height:1;transition:background-color .2s,color .2s}.control-button.add:hover{background-color:var(--success-color);color:#fff}.control-button.remove:hover,.control-button.delete:hover{background-color:var(--danger-color);color:#fff}.control-button.delete{font-size:1.5rem}.order-summary{margin-top:1rem;border-top:2px dashed var(--border-color);padding-top:1.5rem}.total-display,.payment-section{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;font-size:1.1rem}.total-display p{margin:0;font-weight:700}.total-display p:first-child{font-size:1.2rem}.total-display p:last-child{font-size:1.5rem;color:var(--accent-color)}.payment-section label{font-weight:700}.payment-section input{width:120px;padding:.5rem;border-radius:var(--border-radius);border:1px solid var(--border-color);font-size:1.1rem;text-align:right;background-color:var(--primary-bg)}.payment-section input:disabled{background-color:#e9e9e9;cursor:not-allowed}.change-container{min-height:82px;margin-top:1rem}.change-display{color:#fff;padding:1rem;border-radius:var(--border-radius);text-align:center;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.change-display.success{background-color:var(--success-color);display:flex;justify-content:space-between;align-items:center}.change-display.error{background-color:var(--danger-color);font-size:1.1rem;display:flex;align-items:center;justify-content:center;height:100%}.change-display p{margin:0;font-weight:700}.change-display.success p:first-child{font-size:1.2rem}.change-display.success p:last-child{font-size:2rem}.clear-button{background-color:var(--danger-color);color:#fff;border:none;padding:.75rem 1.5rem;font-size:1rem;font-weight:700;border-radius:var(--border-radius);cursor:pointer;transition:background-color .2s;margin-top:1rem}.clear-button:hover{background-color:#c82333}.clear-button:disabled{background-color:var(--secondary-text);cursor:not-allowed}.cart-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem 0;border-bottom:1px solid var(--border-color);gap:.5rem}.item-name{font-weight:500;padding-right:.5rem;word-break:break-word}.item-controls{display:flex;align-items:center;gap:.5rem;flex-shrink:0}@media(min-width:768px){.main-content{flex-direction:row;align-items:flex-start}.products-section{flex:2}.order-section{flex:1;position:sticky;top:1.5rem}}@media(max-width:767px){.cart-item{flex-direction:column;align-items:stretch;gap:.5rem;padding:1rem 0;border-bottom:1px solid var(--border-color)}.item-name{padding-right:0;font-size:1.1rem;text-align:left}.item-controls{display:flex;justify-content:space-between;align-items:center;width:100%}}.cart-item:last-child{border-bottom:none}