* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background-color: #f5f5f5;
  font-family: "Helvetica Neue", Arial, "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;
}

.container {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.title {
  font-size: 3.5rem;
  color: #333;
  letter-spacing: 0.15em;  /* 0.25emから0.15emに縮小 */
  font-weight: 200;
  transition: all 0.3s ease;
  cursor: pointer;
  padding: 20px;
  border: 2px solid transparent;
}

.title:hover {
  color: #000;
  transform: scale(1.05);
  border-bottom: 1px solid #333;
}

@media (max-width: 768px) {
  .title {
    font-size: 2.5rem;
    letter-spacing: 0.1em;  /* モバイル時はさらに詰める */
  }
}