.lang-section {
  display: none;
}

.lang-section.active {
  display: block;
}

body {
  font-family: 'Pretendard', sans-serif;
  margin: 0;
  padding: 1rem;
  line-height: 1.6;
  color: #333;
  background-color: #fff;
}

main {
  max-width: 800px;
  margin: auto;
}

h1, h2, h3, h4 {
  color: #111;
  line-height: 1.3;
}

h1 {
  margin-top: 5rem;
}

h2 {
  margin-top: 4rem;
  margin-bottom: 1rem;
}
h3 {
  margin-top: 3rem;
  margin-bottom: 0.75rem;
}
h4 {
  margin-top: 2.5rem;
  margin-bottom: 0.5rem;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  padding-left: 1.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

th, td {
  border: 1px solid #ccc;
  padding: 0.75rem;
  text-align: left;
  vertical-align: top;
}

th {
  background-color: #f9f9f9;
  font-weight: bold;
}


@media (max-width: 768px) {
  .arrow-indicator {
    display: none;
  }

  body {
      font-size: 0.875rem;
  }

  h1 {
    margin-top: 3rem;
  }

  table,
  thead,
  tbody,
  th,
  td,
  tr {
      display: block;
      width: 100%;
      box-sizing: border-box;
      overflow-x: hidden;
  }

  thead {
      display: none;
  }

  tr {
      margin-bottom: 1.5rem;
      border: 1px solid #ccc;
      border-radius: 8px;
      padding: 1rem;
      background-color: #fdfdfd;
  }

  td {
      border: none;
      padding: 0.75rem 0;
      position: relative;
      word-break: break-word;
      overflow-wrap: break-word;
      border-bottom: 1px solid #eee;
  }

  td:last-child {
      border-bottom: none;
  }

  td::before {
      content: attr(data-label);
      display: block;
      font-weight: bold;
      margin-bottom: 0.25rem;
      color: #555;
  }
}

.revision-info {
  background-color: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  font-size: 0.95rem;
  color: #444;
}

.revision-info p {
  margin: 0.25rem 0;
  line-height: 1.4;
}

.revision-compare {
  display: flex;
  gap: 2rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.revision-column {
  flex: 1 1 300px;
  background-color: #fff;
  border: 1px solid #ddd;
  padding: 1rem;
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.revision-column h5 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  font-size: 1rem;
  color: #333;
}

.revision-column ul {
  margin: 0;
  padding-left: 1.2rem;
}

.revision-column li {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  color: #444;
}


@media (min-width: 769px) {
  .revision-column {
    font-size: 0.75rem;
  }

  .revision-column h5 {
    font-size: 0.75rem;
  }

  .revision-column li {
    font-size: 0.7rem;
  }
}