.table-of-contents {
  margin: 2em 0;
  padding: 1em;
  border: 1px solid var(--outline-color);
  border-radius: 6px;
  background-color: var(--background-color);
}

.table-of-contents::before {
  content: "Table of Contents";
  display: block;
  margin-bottom: 0.5em;
  font-weight: bold;
  font-size: 1.1em;
}

.table-of-contents ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.table-of-contents li {
  position: relative;
  margin: 0.4em 0;
  padding-left: 1.2em;
}
.table-of-contents li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--primary-color);
}

.table-of-contents a {
  color: inherit;
  text-decoration: none;
}

.custom-block {
  position: relative;
  margin: 1.5em 0;
  padding: 1em 1.25em;
  border-left: 4px solid var(--outline-color);
  border-radius: 6px;
  background-color: var(--background-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.custom-block .custom-block-title {
  margin-top: 0;
  margin-bottom: 0.5em;
  font-size: 1em;
  font-weight: bold;
}

.note.custom-block {
  border-color: #2196f3;
}
.note .custom-block-title {
  color: #2196f3;
}
.note .custom-block-title::before {
  content: "📝 ";
}

.tip.custom-block {
  border-color: #4caf50;
}
.tip .custom-block-title::before {
  content: "💡 ";
}
.tip .custom-block-title {
  color: #4caf50;
}

.important.custom-block {
  border-color: #e91e63;
}
.important .custom-block-title::before {
  content: "❗️ ";
}
.important .custom-block-title {
  color: #e91e63;
}

.warning.custom-block {
  border-color: #ff9800;
}
.warning .custom-block-title::before {
  content: "⚠️ ";
}
.warning .custom-block-title {
  color: #ff9800;
}

.caution.custom-block {
  border-color: #ff5722;
}
.caution .custom-block-title::before {
  content: "🔥 ";
}
.caution .custom-block-title {
  color: #ff5722;
}

@media (max-width: 600px) {
  .table-of-contents {
    margin: 1em 0;
    padding: 0.75em;
    font-size: 0.9em;
  }

  .custom-block {
    margin: 1em 0;
    padding: 0.75em 1em;
  }
}