/* Ver.di inspired styling with dark/light mode */
:root {
  --primary-color: #0066cc;
  --secondary-color: #004a9e;
  --background-color: #ffffff;
  --text-color: #333333;
  --border-color: #cccccc;
  --header-bg: #f8f8f8;
  --footer-bg: #f5f5f5;
  --accent-color: #ff6600; /* ver.di's orange color */
}

[data-theme="dark"] {
  --primary-color: #4da6ff;
  --secondary-color: #1a75d0;
  --background-color: #1a1a1a;
  --text-color: #f0f0f0;
  --border-color: #555555;
  --header-bg: #2d2d2d;
  --footer-bg: #333333;
  --accent-color: #ff9940; /* lighter orange for dark mode */
  --invert-value: invert(1);
}

body {
  font-family: "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.content-wrapper {
  display: flex;
  gap: 30px;
  margin-bottom: 20px;
}

.main-content {
  flex: 1;
}

.toc-sidebar {
  width: 200px;
  background-color: var(--footer-bg);
  color: var(--text-color);
  padding: 15px;
  border-radius: 5px;
  height: fit-content;
  position: sticky;
  top: 20px;
  font-size: small;
  order: -1; /* Move to left side */
}

.toc-sidebar h3 {
  margin-top: 0;
  font-size: small;
  color: var(--primary-color);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 5px;
}

.toc-sidebar ul, .toc-sidebar li {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: smaller;
}

.toc-sidebar a {
  text-decoration: none;
  color: var(--text-color);
  display: block;
  padding: 2px 0;
  border-left: 3px solid transparent;
}

.toc-sidebar a:hover {
  border-left: 3px solid var(--primary-color);
  text-decoration: underline;
}

h1, h2, h3 {
  color: var(--primary-color);
  font-weight: bold;
  margin-top: 1.5em;
}

h1 {
  font-size: 1.8em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

h2 {
  font-size: 1.4em;
}

h3 {
  font-size: 1.2em;
}

a {
  color: var(--primary-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.navigation {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-top: 10px;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 10px;
  font-size: small;
}

.toc {
  background-color: #f5f5f5;
  padding: 15px;
  border-radius: 5px;
  margin-top: 20px;
  font-size: small;
}

/* Dark mode toggle button */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--background-color);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: small;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 5px;
}

/* Theme icon sizing */
.theme-icon {
  width: 16px;
  height: 16px;
  stroke-width: 2;
  filter: var(--invert-value);
}

/* Ver.di style elements */
.header {
  background-color: var(--header-bg);
  padding: 15px 20px;
  margin-bottom: 20px;
  border-radius: 5px;
  text-align: center;
  border: 1px solid var(--border-color);
}

.footer {
  background-color: var(--footer-bg);
  padding: 15px 20px;
  margin-top: 30px;
  border-radius: 5px;
  font-size: small;
  text-align: center;
  border: 1px solid var(--border-color);
}

/* Enhanced ver.di style elements */
.verdi-logo {
  display: block;
  margin: 0 auto 10px;
  width: 80px;
  height: 80px;
}

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
  
  .content-wrapper {
    flex-direction: column;
  }
  
  .toc-sidebar {
    width: auto;
    position: static;
    margin-bottom: 20px;
  }
  
  .navigation {
    justify-content: center;
  }
}