body {
  font-family: sans-serif;
  margin: 0;
  padding: 1em;
  background-color: #f9f9f9;
}

h1 {
  font-size: 1.5em;
  text-align: center;
  margin-bottom: 1em;
}

ul {
  list-style: none;
  padding: 0;
  margin: auto;
  max-width: 600px;
}

li {
  margin: 0.5em 0;
  border-radius: 8px;
  border: 1px solid #ddd;
  box-shadow: 0 2px 4px rgba(0,0,0,0.03);
  transition: background 0.2s;
  background: #fff;

  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

li::-webkit-scrollbar {
  display: none;
}

li:hover {
  background: #f0f0f0;
}

a {
  display: block;              /* inline-block → block に変更 */
  white-space: nowrap;        /* 折り返しなし */
  overflow-x: auto;           /* 横スクロール */
  -ms-overflow-style: none;
  scrollbar-width: none;

  padding: 1em;
  text-decoration: none;
  color: #007acc;
  font-weight: bold;
  font-size: 16px;
}

a::-webkit-scrollbar {
  display: none;
}

@media (max-width: 600px) {
  body {
    padding: 0.5em;
  }

  li a {
    font-size: 16px;
    padding: 0.75em;
  }
}