body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #1e1e1e;
  color: #ddd;
}

/* SIDEBAR */
#sidebar {
  width: 250px;
  height: 100vh;
  background: #111;
  position: fixed;
  left: 0;
  top: 0;
  border-right: 1px solid #333;
  display: flex;
  flex-direction: column;
}

#fileList {
  flex: 1;
  overflow-y: auto;
}

.file {
  padding: 8px;
  cursor: pointer;
}

.file:hover {
  background: #2a2a2a;
}

.file.active {
  background: #007acc;
}

/* CONTROLS */
#controls {
  border-top: 1px solid #333;
  padding: 8px;
}

button {
  width: 100%;
  margin: 3px 0;
  padding: 6px;
  background: #222;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background: #333;
}

/* MAIN EDITOR */
#main {
  margin-left: 250px;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

#tabs {
  display: flex;
  background: #181818;
  border-bottom: 1px solid #333;
}

.tab {
  padding: 6px 10px;
  cursor: pointer;
  border-right: 1px solid #333;
}

.tab.active {
  background: #007acc;
}

/* EDITOR */
#editor {
  flex: 1;
  background: #1e1e1e;
  color: #ddd;
  border: none;
  outline: none;
  padding: 12px;
  font-family: monospace;
}

/* PREVIEW */
#frame {
  width: 100%;
  height: 100vh;
  border: none;
}