body {
  font-family: "Arial", sans-serif;
  font-size: 16px;
  line-height: 1.4;
  margin: 0;
  padding: 20px;
  background-color: #ffffff;
  color: #000000;
}

header {
  border-bottom: 1px solid #000000;
  padding-bottom: 10px;
  margin-bottom: 20px;
}

header nav {
  font-weight: bold;
}

.nav-item {
  margin-right: 10px;
}

.nav-item:not(:last-child)::after {
  content: " | ";
  color: #000000;
  margin-left: 10px;
}

header nav a {
  color: #0000ff;
  text-decoration: underline;
}

header nav a:visited {
  color: #4da6ff;
}

.breadcrumb {
  font-size: 14px;
  margin-bottom: 20px;
  color: #666666;
}

.breadcrumb a {
  color: #0000ff;
  text-decoration: underline;
}

.breadcrumb a:visited {
  color: #4da6ff;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 20px;
  margin-bottom: 10px;
  font-weight: bold;
}

h1 {
  font-size: 24px;
}

h2 {
  font-size: 20px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 16px;
}

a {
  color: #0000ff;
  text-decoration: underline;
}

a:visited {
  color: #4da6ff;
}

ul, ol {
  margin-bottom: 16px;
  padding-left: 40px;
}

li {
  margin-bottom: 4px;
}

table {
  border-collapse: collapse;
  margin-bottom: 16px;
}

th, td {
  border: 1px solid #000000;
  padding: 4px 8px;
  text-align: left;
}

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

code {
  font-family: "Courier New", monospace;
  background-color: #f0f0f0;
  padding: 2px 4px;
}

pre {
  font-family: "Courier New", monospace;
  background-color: #f0f0f0;
  padding: 10px;
  overflow-x: auto;
  white-space: pre;
}

blockquote {
  margin-left: 20px;
  padding-left: 10px;
  border-left: 2px solid #cccccc;
  font-style: italic;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 16px 0;
}

@media (max-width: 768px) {
  body {
    padding: 15px;
    font-size: 15px;
  }
  
  header nav {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
  }
  
  .nav-item {
    margin-right: 15px;
    margin-bottom: 5px;
  }
  
  h1 { font-size: 22px; }
  h2 { font-size: 19px; }
  h3 { font-size: 17px; }
  
  pre {
    overflow-x: scroll;
    font-size: 12px;
  }
  
  table {
    font-size: 14px;
    overflow-x: auto;
    display: block;
    white-space: nowrap;
  }
}

@media (max-width: 480px) {
  body {
    padding: 10px;
    font-size: 14px;
    overflow-x: hidden;
  }
  
  header nav {
    display: block;
    line-height: 1.6;
    width: 100%;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  
  .nav-item {
    display: inline;
    margin-right: 0;
  }
  
  .nav-item:not(:last-child)::after {
    content: " | ";
  }
  
  .breadcrumb {
    font-size: 12px;
    word-break: break-all;
  }
  
  h1 { font-size: 20px; }
  h2 { font-size: 18px; }
  h3 { font-size: 16px; }
  
  ul, ol {
    padding-left: 20px;
  }
  
  th, td {
    padding: 3px 6px;
    font-size: 13px;
  }
}