テキストが「MENU ↔ CLOSE」に切り替わるスライドダウンメニュー

<div class="menu-wrapper">
  <button class="toggle-button" id="menu-toggle">MENU</button>
  <nav class="text-slide-menu" id="text-slide-menu">
    <a href="#">TOP</a>
    <a href="#">ABOUT</a>
    <a href="#">WORKS</a>
    <a href="#">CONTACT</a>
  </nav>
</div>

.menu-wrapper {
  position: relative;
  text-align: center;
  margin-top: 40px;
}

.toggle-button {
  background: #222;
  color: #fff;
  padding: 14px 28px;
  border: none;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s ease;
}
.toggle-button:hover {
  background: #555;
}

.text-slide-menu {
  position: absolute;
  top: 60px;
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  opacity: 0;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all 0.3s ease;
  z-index: 10;
}
.text-slide-menu.open {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  pointer-events: auto;
}
.text-slide-menu a {
  background: #111;
  color: #fff;
  padding: 10px 16px;
  border-radius: 20px;
  text-decoration: none;
  font-size: 0.9rem;
}
.text-slide-menu a:hover {
  background: #f44336;
}

const toggleBtn = document.getElementById("menu-toggle");
const menu = document.getElementById("text-slide-menu");

toggleBtn.addEventListener("click", () => {
  menu.classList.toggle("open");
  toggleBtn.textContent = menu.classList.contains("open") ? "CLOSE" : "MENU";
});