document.addEventListener('click', async (event) => {
    const button = event.target.closest('[data-airport-coupon]');
    if (!button) return;
    const status = button.closest('.airport-recommendations').querySelector('.airport-copy-status');
    try {
        let copied = false;
        if (navigator.clipboard?.writeText) {
            try { await navigator.clipboard.writeText(button.dataset.airportCoupon); copied = true; } catch { /* Try the user-activated fallback below. */ }
        }
        if (!copied) {
            const field = document.createElement('textarea');
            field.value = button.dataset.airportCoupon;
            field.setAttribute('readonly', '');
            field.style.cssText = 'position:fixed;left:-9999px;top:0';
            document.body.append(field);
            try { field.select(); copied = document.execCommand('copy'); }
            finally { field.remove(); button.focus({preventScroll:true}); }
        }
        if (!copied) throw new Error('Copy unavailable');
        status.textContent = '优惠码已复制';
        button.classList.add('is-copied');
        button.setAttribute('aria-label', '优惠码已复制');
        window.setTimeout(() => {
            button.classList.remove('is-copied');
            button.setAttribute('aria-label', `复制优惠码 ${button.dataset.airportCoupon}`);
        }, 2000);
    } catch {
        const selection = window.getSelection();
        const range = document.createRange();
        range.selectNodeContents(button.querySelector('span'));
        selection.removeAllRanges(); selection.addRange(range);
        status.textContent = '已选中优惠码，请长按或使用复制快捷键';
    }
});