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    function copyCode(elem) {
        navigator.clipboard.writeText(elem.innerText);
        const original = elem.innerText;
        elem.innerText = '已复制';
        setTimeout(() => elem.innerText = original, 1000);
    }

    async function bindInvite() {
        const code = document.getElementById('inputInviteCode').value.trim();
        if(!code) return toast('提示', '请输入邀请码');
        
        try {
            const res = await fetch('/user/bindInvite', {
                method: 'POST',
                headers: getAuthHeaders('application/x-www-form-urlencoded'),
                body: `code=${code}`
            });
            const data = await res.json();
            if(data.error) {
                toast('失败', data.error);
            } else {
                toast('成功', data.message);
                fetchUserInfo();
            }
        } catch(e) {
            toast('绑定失败', e.message || '绑定失败');
        }
    }

    async function loadProducts() {
        const list = document.getElementById('productList');
        list.innerHTML = '加载中...';
        try {
            const res = await fetch('/payment/products');
            const products = await res.json();
            list.innerHTML = '';
            products.forEach(p => {
                const card = document.createElement('div');
                card.className = 'product-card';
                card.onclick = () => selectProduct(p.id, card);
                card.innerHTML = `
                    
${p.name}

                    
¥${p.price}

                    
${p.type === 'subscription' ? '时长: '+p.value+'天' : '流量: '+p.value+' Tokens'}

                `;
                list.appendChild(card);
            });
        } catch (e) {
            list.innerHTML = '加载失败';
        }
    }

    function selectProduct(pid, cardElem) {
        selectedProductId = pid;
        document.querySelectorAll('.product-card').forEach(c => c.classList.remove('selected'));
        cardElem.classList.add('selected');
        
        const area = document.getElementById('payActionArea');
        if(!document.getElementById('btnPay')) {
            area.innerHTML = '';
            const btn = document.createElement('button');
            btn.id = 'btnPay';
            btn.className = 'btn primary';
            btn.style.width = '100%';
            btn.style.marginTop = '15px';
            btn.innerText = '立即支付';
            btn.onclick = doPay;
            area.appendChild(btn);
        }
    }

    async function doPay() {
        if(!selectedProductId) return toast('提示', '请选择商品');
        const payMethod = document.querySelector('input[name="payMethod"]:checked').value;
        
        try {
            const res = await fetch('/payment/create_order', {
                method: 'POST',
                headers: getAuthHeaders('application/x-www-form-urlencoded'),
                body: `product_id=${selectedProductId}&pay_method=${payMethod}`
            });
            const data = await res.json();
            if(data.error) return toast('失败', data.error);
            
            const order = data.order;
            // Mock Pay
            const ok = await uiConfirm(`订单已创建: ${order.order_no}\n金额: ¥${order.amount}\n\n模拟支付成功？`, '模拟支付');
            if(ok) {
                 const payRes = await fetch('/payment/pay', {
                    method: 'POST',
                    headers: {'Content-Type': 'application/x-www-form-urlencoded'},
                    body: `order_no=${order.order_no}`
                });
                const payData = await payRes.json();
                if(payData.message === 'Payment successful') {
                    toast('成功', '支付成功！');
                    closeWallet();
                    fetchUserInfo(); 
                } else {
                    toast('支付失败', (payData.error || payData.message || '支付失败'));
                }
            }
        } catch (e) {
            toast('系统错误', e.message || '系统错误');
        }
    }

    // Init
    fetchUserInfo();