* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: #1e1e1e;
  color: #fff;
}

.app {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  background-color: #2d2d2d;
  padding: 15px 20px;
  border-bottom: 2px solid #007acc;
}

.app-header h1 {
  font-size: 24px;
  margin-bottom: 5px;
  color: #007acc;
}

.app-header p {
  font-size: 14px;
  color: #aaa;
}

.app-container {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.editor-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-right: 1px solid #444;
}

.editor-wrapper {
  flex: 1;
  overflow: hidden;
}

.simulator-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

  .editor-panel {
    border-right: none;
    border-bottom: 1px solid #444;
  }
}