/* セクションのタイトル */
.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  text-align: center;
  padding: 0.75em 1em;
  margin-bottom: 1.5em;
  color: #CFCFCF;
}

.section-title-sub {
  font-size: 1.25rem;
  font-weight: 500;
  text-align: left;
  border-left: 8px solid rgba(255, 255, 255, 0.1);
  padding-left: 0.75em;
  margin-top: 1.5em;
  margin-bottom: 1em;
  color: #CFCFCF;
}

/* リンク色（青） */
a {
  color: #05C7F2;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #0540F2; 
  text-decoration: none;
}

/* 有効なButton */
a.btn {
  display: inline-block;
  background-color: #0540F2;
  color: #CFCFCF;
  font-weight:400;
  border: 1px solid #05C7F2;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  border-radius: 0.375rem;
  text-align: center;
  vertical-align:middle;
  cursor: pointer;
  transition: background-color 0.15s ease-in-out;
  width: fit-content; /* ここがポイント */
}
a.btn:hover {
  background-color: #05C7F2;
  color: #CFCFCF;
  text-decoration: none;
}

/* 無効なButton */
.btn-secondary {
  display: inline-block;
  color: #CFCFCF;
  background-color: #999999;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  border-radius: 0.375rem;
  text-align: center;
  vertical-align: middle;
  user-select: none;
}