document.addEventListener("DOMContentLoaded", function () { // ==== 予約ボタン UI ==== const reserveBtn = document.createElement("div"); reserveBtn.id = "fixed-reserve-btn"; reserveBtn.innerHTML = '園見学・イベント予約'; document.body.appendChild(reserveBtn);// ==== スタイル共通 ==== const style = document.createElement("style"); style.textContent = ` #fixed-reserve-btn { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 9999; transition: opacity 0.3s; } #fixed-reserve-btn a { display: inline-block; background-color: #65babc; color: #fff; padding: 12px 24px; border-radius: 30px; font-size: 16px; font-weight: bold; text-decoration: none; box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15); transition: 0.3s; text-align: center; line-height: 1.4; } #fixed-reserve-btn a:hover { background-color: #ffffff; color: #000; }`; document.head.appendChild(style);// ====