nav {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.6);
  padding: 15px 30px;
  border-radius: 10px;
  display: flex;
  gap: 20px;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  font-weight: bold;
}

nav a:hover {
  color: #ffcc00;
}
body {
  margin: 0;
  padding-top: 100px;
  text-align: center;
  font-family: sans-serif;

  background-color: #f0f0f0; 
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
}
/* 左下メニュー */
.left-menu {
  position: fixed;
  bottom: 20px;
  left: 20px;
  background: rgba(0,0,0,0.6);
  padding: 15px 20px;
  border-radius: 10px;
  color: #fff;
  width: 150px;
  backdrop-filter: blur(4px);
}

.left-menu h3 {
  margin: 0 0 10px;
  font-size: 18px;
  border-bottom: 1px solid #fff;
  padding-bottom: 5px;
}

.left-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.left-menu li {
  margin: 8px 0;
}

.left-menu a {
  color: #ffeb3b;
  text-decoration: none;
}

/* 設定パネル */
.settings-panel {
  position: fixed;
  bottom: 120px;
  left: 20px;
  background: rgba(0,0,0,0.7);
  padding: 15px;
  border-radius: 10px;
  display: none;
  color: #fff;
  width: 150px;
}

.settings-panel button {
  display: block;
  margin: 10px 0;
  width: 120px;
  padding: 8px;
  cursor: pointer;
}

/* contactパネル */
.contact-panel {
  position: fixed;
  bottom: 120px;
  left: 200px;
  background: rgba(0,0,0,0.7);
  padding: 15px;
  border-radius: 10px;
  display: none;
  color: #fff;
  width: 200px;
}