/* Sidebar Toggle Button */
.sidebar-toggle {
  background-color: #8a2be2; /* Fully purple background */
  border: none;
  color: #ffffff; /* White icon */
  font-size: 1.5rem;
  cursor: pointer;
  padding: 10px; /* Add padding for better click area */
  border-radius: 5px; /* Rounded corners */
  margin-right: 20px; /* Space between toggle button and logo */
  transition: background-color 0.3s ease;
}

.sidebar-toggle:hover {
  background-color: #7b1fa2; /* Darker purple on hover */
}

/* Logo Styles */
.logo {
  font-size: 24px;
  font-weight: bold;
  color: #8a2be2; /* Purple */
  transition: color 0.3s ease;
  margin-left: 20px; /* Space between toggle button and logo */
}

.logo:hover {
  color: #7b1fa2; /* Darker purple */
}

/* Sidebar Styles */
.sidebar {
  width: 250px;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.9); /* Semi-transparent black background */
  color: #ffffff;
  position: fixed;
  top: 0;
  left: -250px;
  transition: left 0.3s ease;
  z-index: 1000;
  box-shadow: 2px 0 10px rgba(138, 43, 226, 0.5); /* Purple glow */
  border-right: 2px solid #8a2be2; /* Purple border */
  overflow: hidden; /* Hide overflow for the entire sidebar */
}

.sidebar.open {
  left: 0;
}

/* Sidebar Header */
.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background-color: rgba(0, 0, 0, 0.95); /* Darker background for header */
  border-bottom: 2px solid #8a2be2; /* Purple border */
  position: sticky;
  top: 0;
  z-index: 1;
}

.sidebar-header h3 {
  margin: 0;
  font-size: 1.2rem;
  color: #8a2be2; /* Purple */
}

.close-btn {
  background: none;
  border: none;
  color: #ffffff;
  font-size: 1.5rem;
  cursor: pointer;
  transition: color 0.3s ease;
}

.close-btn:hover {
  color: #8a2be2; /* Purple on hover */
}

/* Sidebar Menu */
.sidebar-menu {
  list-style: none;
  padding: 0;
  margin: 0;
  height: calc(100vh - 60px); /* Full height minus header height */
  overflow-y: auto; /* Enable vertical scrolling */
}

.sidebar-menu li {
  border-bottom: 1px solid rgba(138, 43, 226, 0.3); /* Subtle purple border */
}

.sidebar-menu li a {
  display: block;
  padding: 10px 15px;
  color: #ffffff;
  text-decoration: none;
  transition: background-color 0.3s ease, color 0.3s ease;
  position: relative;
  perspective: 1000px; /* Enable 3D perspective */
}

.sidebar-menu li a::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
   /* Purple for animation */
  transform: rotateX(90deg) translateZ(-25px);
  transform-origin: bottom;
  transition: transform 0.3s ease;
  opacity: 0;
}

.sidebar-menu li a:hover {
  background-color: #8a2be2; /* Purple on hover */
  color: #ffffff;
  transform: translateZ(25px);
}

.sidebar-menu li a:hover::before {
  transform: rotateX(0deg) translateZ(0);
  opacity: 1;
}

/* Main Topic */
.main-topic {
  font-weight: bold;
  font-size: 1.1rem;
  color: #8a2be2; /* Purple */
}

/* Subtopic Dropdown */
.subtopics {
  list-style: none;
  padding-left: 20px;
  display: none;
  background-color: rgba(0, 0, 0, 0.8); /* Darker background for subtopics */
  border-left: 2px solid #8a2be2; /* Purple border */
}

.subtopics.active {
  display: block;
}

.subtopics li a {
  padding: 8px 15px;
  font-size: 0.9rem;
  color: yellow;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.subtopics li a:hover {
  background-color: rgba(138, 43, 226, 0.2); /* Subtle purple hover */
  color: #ffffff;
}

/* Content Wrapper */
.content-wrapper {
  transition: margin-left 0.3s ease;
}

.content-wrapper.shifted {
  margin-left: 250px;
}

/* Prevent body scrolling when sidebar is active */
body.sidebar-active {
  overflow: hidden; /* Disable scrolling on the body */
}