body {
  text-align: center;
  margin: 0;
  padding: 20px;
  font-family: sans-serif;
}

#map {
  display: block;
  margin: 0 auto 20px auto;
  max-width: 100%;
}

#controls {
  margin-bottom: 20px;
}

/* 駅名ツールチップ */
#station-tooltip {
  position: absolute;
  background-color: #fefefe;
  color: #1a1a1a;
  border: 1px solid #666;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 14px;
  font-family: "Segoe UI", "ヒラギノ角ゴ ProN", sans-serif;
  white-space: nowrap;
  pointer-events: none;
  display: none;
  box-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
  z-index: 1000;
}