/* CSS Variables for Theming */
:root {
  --bg-primary: #f1f1f1;
  --bg-secondary: #ffffff;
  --bg-sidebar: #f1f1f1;
  --text-primary: #000;
  --text-secondary: #555;
  --border-color: #e0e0e0;
  --code-bg: #f1f1f1;
  --code-content-bg: #fff;
  --accent-color: #4caf50;
  --hover-bg: #ddd;
}

body.dark-mode {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-sidebar: #252525;
  --text-primary: #e0e0e0;
  --text-secondary: #b0b0b0;
  --border-color: #404040;
  --code-bg: #2d2d2d;
  --code-content-bg: #1f1f1f;
  --accent-color: #4caf50;
  --hover-bg: #3a3a3a;
}

/* Global Styles */
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Header */
.header {
  background-color: var(--bg-secondary);
  padding: 15px 30px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--accent-color);
  text-decoration: none;
}

.logo span {
  color: var(--text-primary);
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: 20px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background-color: var(--hover-bg);
  border-color: var(--accent-color);
}

.theme-toggle .icon {
  font-size: 18px;
}

/* Container for Sidebar and Main Content */
.container {
  display: flex;
  height: calc(100vh - 65px); /* Adjust based on header height */
}

/* Sidebar */
.sidebar {
  width: 250px;
  background-color: var(--bg-sidebar);
  overflow-y: auto;
  border-right: 1px solid var(--border-color);
  flex-shrink: 0;
  padding-bottom: 50px;
}

.sidebar h3 {
  padding: 10px 20px;
  margin: 10px 0 0 0;
  font-size: 18px;
  color: var(--text-primary);
}

.sidebar a {
  display: block;
  padding: 8px 20px;
  color: var(--text-primary);
  text-decoration: none;
  font-size: 15px;
}

.sidebar a:hover {
  background-color: var(--hover-bg);
  color: var(--text-primary);
}

.sidebar a.active {
  background-color: var(--accent-color);
  color: white;
}

/* Main Content */
.main-content {
  flex-grow: 1;
  padding: 20px 40px;
  background-color: var(--bg-secondary);
  overflow-y: auto;
}

h1 {
  font-size: 40px;
  margin-top: 10px;
}

h2 {
  font-size: 30px;
  margin-top: 35px;
}

p {
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: 15px;
}

/* Code Box */
.code-box {
  background-color: var(--code-bg);
  padding: 15px;
  border-radius: 5px;
  border-left: 5px solid var(--accent-color);
  margin: 20px 0;
  font-family: "Consolas", "Monaco", monospace;
  font-size: 15px;
}

.code-header {
  font-weight: bold;
  margin-bottom: 10px;
  color: var(--text-secondary);
}

.code-content {
  background-color: var(--code-content-bg);
  padding: 15px;
  border: 1px solid var(--border-color);
  overflow-x: auto;
}

/* Syntax Highlighting Simulators */
.php-tag {
  color: #d73a49;
  font-weight: bold;
} /* <?php */
.php-func {
  color: #005cc5;
} /* echo */
.php-str {
  color: #032f62;
} /* "Hello" */
.php-var {
  color: #e36209;
} /* $variable */
.php-comment {
  color: #6a737d;
  font-style: italic;
} /* // comment */

/* Navigation Buttons */
.nav-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 50px;
  margin-bottom: 50px;
  padding-top: 20px;
  border-top: 1px solid #eee;
}

.nav-btn {
  background-color: #4caf50;
  color: white;
  padding: 10px 20px;
  text-decoration: none;
  font-size: 18px;
  border-radius: 5px;
  transition: background-color 0.3s;
}

.nav-btn:hover {
  background-color: #45a049;
}

.nav-btn.prev {
  background-color: #ddd;
  color: black;
}

.nav-btn.prev:hover {
  background-color: #ccc;
}

/* Mobile Responsive */
.menu-icon {
  display: none;
  font-size: 24px;
  cursor: pointer;
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
    height: auto;
  }

  .sidebar {
    width: 100%;
    height: auto;
    display: none; /* Hidden by default on mobile */
    border-right: none;
  }

  .sidebar.show {
    display: block;
  }

  .menu-icon {
    display: block;
  }

  .main-content {
    padding: 15px;
  }
}