body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f0f0f;
  color: #fff;
}

.app {
  display: flex;
}

.sidebar {
  width: 220px;
  background: #181818;
  padding: 15px;
}

.sidebar a {
  display: block;
  padding: 10px;
  color: #ccc;
  text-decoration: none;
  border-radius: 6px;
}

.sidebar a.active,
.sidebar a:hover {
  background: #303030;
  color: #fff;
}

.editor {
  flex: 1;
  padding: 30px;
}

textarea, select {
  width: 100%;
  margin-bottom: 15px;
  padding: 12px;
  background: #202020;
  color: #fff;
  border: 1px solid #333;
  border-radius: 6px;
}

button {
  padding: 12px 20px;
  background: #1a73e8;
  border: none;
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
}

button:hover {
  background: #1666cc;
}

.hidden {
  display: none;
}

video {
  width: 100%;
  margin-top: 15px;
  border-radius: 10px;
}