:root {
  /* Dark mode colors (default) */
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --link-color: #4a9eff;
  --header-bg: #2d2d2d;
  --border-color: #444;
}

[data-theme="light"] {
  /* Light mode colors */
  --bg-color: #ffffff;
  --text-color: #333333;
  --link-color: #0066cc;
  --header-bg: #f5f5f5;
  --border-color: #ddd;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
  line-height: 1.6;
  word-wrap: break-word;
  margin: 0;
  overflow-x: hidden;
  font-family: Arial, sans-serif;
}

#main { 
  max-width: 800px;
  width: 100%;
  margin: 0 auto; 
  text-align: left;
  padding: 0 1rem;
  box-sizing: border-box;
}

header {
  background-color: var(--header-bg);
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

header nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 1rem;
}

.theme-links {
  display: flex;
  gap: 1rem;
}

.theme-links a {
  color: var(--link-color);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.theme-links a:hover {
  background-color: var(--border-color);
}

a {
  color: var(--link-color);
  transition: color 0.3s ease;
}

footer {
  margin-top: auto;
}

/* Make images responsive */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Center content on index page */
.home #main {
  text-align: center;
}

.home #main ul {
  text-align: left;
  display: inline-block;
}