/* Reset defaults */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Body */
body {
  display: flex;
  background-color: #f4f4f4;
  color: #333;
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

/* Dark mode */
body.dark-mode {
  background-color: #121212;
  color: #e0e0e0;
}

/* Navbar */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 250px;
  height: 100%;
  background-color: #1a1a2e;
  color: #fff;
  padding: 20px;
  overflow-y: auto;
  box-shadow: 2px 0 5px rgba(0,0,0,0.3);
}

#navbar header {
  font-size: 1.6rem;
  margin-bottom: 20px;
  text-align: center;
}

.nav-link {
  display: block;
  color: #fff;
  text-decoration: none;
  padding: 10px 0;
  border-radius: 5px;
  transition: 0.3s;
}

.nav-link:hover,
.nav-link.active {
  background-color: #f39c12;
  color: #fff;
  padding-left: 10px;
}

/* Theme toggle */
#toggle-theme {
  display: block;
  margin: 10px auto 20px auto;
  padding: 5px 10px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  background-color: #f39c12;
  color: #fff;
  transition: 0.3s;
}

#toggle-theme:hover {
  background-color: #e67e22;
}

/* Main content */
#main-doc {
  margin-left: 270px;
  padding: 20px 40px;
  flex: 1;
}

.main-section {
  margin-bottom: 50px;
  border-left: 4px solid #f39c12;
  padding-left: 15px;
}

.main-section header {
  font-size: 2rem;
  margin-bottom: 15px;
  color: #162447;
}

code {
  display: block;
  background-color: #e0e1dd;
  padding: 10px;
  margin: 10px 0;
  border-radius: 5px;
  font-family: monospace;
  overflow-x: auto;
}

ul {
  margin: 10px 0 20px 20px;
}

li {
  margin-bottom: 5px;
}

/* Responsive layout */
@media (max-width: 768px) {
  #navbar {
    position: relative;
    width: 100%;
    height: auto;
  }
  #main-doc {
    margin-left: 0;
  }
}