:root{--primary: #d32f2f;--primary-dark: #b71c1c;--primary-light: #ef9a9a;--orange: #f39c12;--dark: #2c3e50;--gray: #95a5a6;--light-gray: #f5f5f5;--border: #e0e0e0;--text: #333;--text-light: #666;--white: #fff;--success: #27ae60;--warning: #f39c12;--danger: #e74c3c;--info: #3498db}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;color:var(--text);background:#f0f0f0;line-height:1.6}a{color:var(--primary);text-decoration:none}a:hover{color:var(--primary-dark)}.container{max-width:1200px;margin:0 auto;padding:0 15px}.header{background:var(--primary);color:#fff}.header-main{display:flex;align-items:center;justify-content:space-between;padding:0 20px;height:64px;max-width:1200px;margin:0 auto}.header-logo{font-size:24px;font-weight:700;color:#fff}.header-nav{display:flex;gap:30px}.header-nav a{color:#fff;font-size:15px;font-weight:500}.header-nav 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button.active{color:var(--primary);border-bottom:2px solid var(--primary)}.product-tabs-content{padding:20px}.cart-page{background:#fff;border-radius:4px;padding:20px;margin-bottom:15px}.cart-page h2{margin-bottom:15px}.cart-item{display:flex;align-items:center;gap:15px;padding:15px 0;border-bottom:1px solid var(--border)}.cart-item-image{width:80px;height:80px;border-radius:4px;object-fit:cover;background:var(--light-gray)}.cart-item-info{flex:1}.cart-item-name{font-size:15px;margin-bottom:5px}.cart-item-store{font-size:13px;color:var(--gray)}.cart-item-price{font-size:16px;font-weight:700;color:var(--danger);width:100px}.cart-item-qty{display:flex;align-items:center;gap:5px}.cart-item-qty button{width:30px;height:30px;border:1px solid var(--border);background:#fff;cursor:pointer;border-radius:4px}.cart-item-qty input{width:50px;text-align:center;border:1px solid var(--border);border-radius:4px;padding:5px}.cart-item-subtotal{font-size:16px;font-weight:700;width:100px;text-align:right}.cart-item-remove{color:var(--gray);cursor:pointer;padding:5px}.cart-item-remove:hover{color:var(--danger)}.cart-footer{display:flex;justify-content:space-between;align-items:center;padding:20px 0}.cart-total{font-size:16px}.cart-total .amount{font-size:24px;font-weight:700;color:var(--danger)}.btn-checkout{padding:12px 40px;background:var(--primary);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:16px}.btn-checkout:hover{background:var(--primary-dark)}.auth-page{max-width:400px;margin:50px auto;background:#fff;border-radius:8px;padding:30px}.auth-page h2{text-align:center;margin-bottom:20px}.auth-form{display:flex;flex-direction:column;gap:15px}.auth-form input{padding:12px;border:1px solid var(--border);border-radius:4px;font-size:14px}.auth-form 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var(--border);border-radius:4px;padding:15px;cursor:pointer;width:280px}.checkout-address-item.selected{border-color:var(--primary)}.checkout-summary{background:#f9f9f9;padding:15px;border-radius:4px;margin-top:15px}.checkout-summary-row{display:flex;justify-content:space-between;padding:5px 0}.checkout-summary-total{font-size:18px;font-weight:700;color:var(--danger);border-top:2px solid var(--border);margin-top:10px;padding-top:10px}.lang-switch{display:inline-flex;gap:2px;margin-right:12px;border:1px solid var(--border);border-radius:4px;overflow:hidden}.lang-btn{border:none;background:transparent;padding:3px 8px;font-size:12px;cursor:pointer;color:var(--text-light)}.lang-btn.active{background:var(--primary);color:#fff}.lang-btn:hover:not(.active){background:var(--light-gray)}.header .lang-btn{color:#ffffffd9}.header .lang-btn.active{background:#ffffff40;color:#fff}.header 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