:root{--tg-theme-bg-color: #ffffff;--tg-theme-text-color: #000000;--tg-theme-button-color: #3390ec;--tg-theme-button-text-color: #ffffff;--primary: #3390ec;--secondary: #6c757d;--success: #28a745;--danger: #dc3545;--background: #f8f9fa;--card-bg: #ffffff;--border-color: #dee2e6}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--background);color:var(--text-color);line-height:1.5}.container{max-width:480px;margin:0 auto;padding:16px 16px 80px}.header{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--border-color);margin-bottom:16px;position:sticky;top:0;background:var(--background)}.header h1{font-size:20px;font-weight:600}.cart-btn{position:relative;background:none;border:none;font-size:24px;cursor:pointer}.cart-badge{position:absolute;top:-8px;right:-8px;background:var(--danger);color:#fff;font-size:12px;width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center}.categories{display:flex;gap:8px;overflow-x:auto;padding:8px 0;margin-bottom:16px}.category-btn{padding:8px 16px;border:1px solid var(--border-color);border-radius:20px;background:var(--card-bg);cursor:pointer;white-space:nowrap;font-size:14px;transition:all .2s}.category-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.products-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.product-card{background:var(--card-bg);border-radius:12px;overflow:hidden;box-shadow:0 2px 8px #0000001a;cursor:pointer;transition:transform .2s}.product-card:hover{transform:translateY(-2px)}.product-image{width:100%;height:150px;object-fit:cover;background:#eee}.product-info{padding:12px}.product-name{font-size:14px;font-weight:500;margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.product-price{font-size:16px;font-weight:600;color:var(--primary)}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:var(--card-bg);border-top:1px solid var(--border-color);display:flex;justify-content:space-around;padding:12px;max-width:480px;margin:0 auto}.nav-item{display:flex;flex-direction:column;align-items:center;gap:4px;background:none;border:none;cursor:pointer;color:var(--secondary);font-size:12px}.nav-item.active{color:var(--primary)}.nav-icon{font-size:20px}.product-detail{padding-bottom:20px}.detail-image{width:100%;height:300px;object-fit:cover;border-radius:12px;margin-bottom:16px}.detail-title{font-size:24px;font-weight:600;margin-bottom:8px}.detail-price{font-size:28px;font-weight:700;color:var(--primary);margin-bottom:16px}.detail-description{color:var(--secondary);margin-bottom:16px;line-height:1.6}.size-selector,.color-selector{margin-bottom:16px}.selector-label{font-weight:500;margin-bottom:8px;display:block}.size-options,.color-options{display:flex;gap:8px;flex-wrap:wrap}.size-btn,.color-btn{padding:8px 16px;border:1px solid var(--border-color);border-radius:8px;background:var(--card-bg);cursor:pointer}.size-btn.active,.color-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.quantity-selector{display:flex;align-items:center;gap:16px;margin-bottom:20px}.qty-btn{width:40px;height:40px;border:1px solid var(--border-color);border-radius:8px;background:var(--card-bg);font-size:20px;cursor:pointer}.qty-value{font-size:20px;font-weight:600;min-width:40px;text-align:center}.add-to-cart{width:100%;padding:16px;background:var(--primary);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer}.cart-page h2{font-size:24px;margin-bottom:16px}.cart-item{display:flex;gap:12px;padding:12px;background:var(--card-bg);border-radius:12px;margin-bottom:12px}.cart-item-image{width:80px;height:80px;object-fit:cover;border-radius:8px}.cart-item-info{flex:1}.cart-item-name{font-weight:500;margin-bottom:4px}.cart-item-price{color:var(--primary);font-weight:600}.cart-item-qty{display:flex;align-items:center;gap:8px;margin-top:8px}.cart-item-qty button{width:28px;height:28px;border:1px solid var(--border-color);border-radius:4px;background:#fff;cursor:pointer}.cart-total{padding:16px;background:var(--card-bg);border-radius:12px;margin-top:16px}.cart-total-row{display:flex;justify-content:space-between;margin-bottom:8px}.cart-total-row.final{font-size:18px;font-weight:600;padding-top:8px;border-top:1px solid var(--border-color)}.checkout-btn{width:100%;padding:16px;background:var(--success);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;margin-top:16px}.checkout-form{padding:16px;background:var(--card-bg);border-radius:12px}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:8px;font-weight:500}.form-group input,.form-group textarea{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:8px;font-size:14px}.back-btn{display:flex;align-items:center;gap:8px;background:none;border:none;cursor:pointer;font-size:16px;margin-bottom:16px}.empty-state{text-align:center;padding:48px 16px;color:var(--secondary)}.empty-state-icon{font-size:64px;margin-bottom:16px}.success-message{text-align:center;padding:48px 16px}.success-icon{font-size:64px;margin-bottom:16px}.back-home-btn{padding:12px 24px;background:var(--primary);color:#fff;border:none;border-radius:8px;font-size:16px;cursor:pointer;margin-top:16px}