/*リセット*/
section  .grid-container h1,h2,h3,h4,h5,h6 {
  font-weight: normal;
  margin: 0;
  padding: 0;
}
/*デザイン*/
section  .grid-container h1 {
  font-family: "Noto Sans JP", "Helvetica Neue", sans-serif;
  font-size: 2.4rem;
  font-weight: 700;
  color: #003366;
  border-bottom: 3px solid #cc0000;
  padding-bottom: 0.3em;
  margin-bottom: 1em;
  letter-spacing: 0.05em;
}

section  .grid-container h2 {
  font-size: 2rem;
  font-weight: 600;
  color: #003366;
  border-left: 5px solid #cc0000;
  padding-left: 0.6em;
  margin-bottom: 0.8em;
}

section  .grid-container h3 {
  font-size: 1.6rem;
  font-weight: 500;
  color: #333;
  position: relative;
  padding-left: 1.2em;
}
section  .grid-container h3::before {
  content: "■";
  position: absolute;
  left: 0;
  color: #cc0000;
  font-size: 0.8em;
  top: 0.2em;
}

section  .grid-container h4 {
  font-size: 1.4rem;
  font-weight: 500;
  color: #444;
  border-bottom: 1px dashed #ccc;
  margin-bottom: 0.5em;
}

section  .grid-container h5 {
  font-size: 1.2rem;
  font-weight: 400;
  color: #555;
  background-color: #f5f5f5;
  padding: 0.3em 0.6em;
  display: inline-block;
  border-radius: 4px;
}

section  .grid-container h6 {
  font-size: 1rem;
  font-weight: 400;
  color: #666;
  font-style: italic;
}