* {
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  margin: 0;
  height: 100vh;
}

.app {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 280px;
  background: #1e1e1e;
  color: #fff;
  padding: 16px;
  overflow-y: auto;
}

.sidebar h2 {
  margin-top: 0;
  margin-bottom: 16px;
}

.section {
  width: 100%;
  background: #2c2c2c;
  color: #fff;
  border: none;
  padding: 10px;
  text-align: left;
  cursor: pointer;
  font-weight: bold;
  margin-top: 8px;
}

.submenu {
  display: none;
  margin-left: 10px;
}

.submenu button {
  width: 100%;
  background: none;
  border: none;
  color: #ccc;
  padding: 8px;
  text-align: left;
  cursor: pointer;
}

.submenu button:hover {
  color: #fff;
}

.content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

.video-wrapper {
  margin-bottom: 16px;
}

iframe {
  width: 100%;
  max-width: 800px;
  height: 450px;
}
.video-wrapper {
  margin-bottom: 20px;
}

iframe {
  width: 100%;
  max-width: 900px;
  height: 500px;
}