body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #05060a;
  color: #f5f5f5;
}

#app-root {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  padding: 12px 16px;
  border-bottom: 1px solid #222;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.main {
  flex: 1;
  display: flex;
  padding: 16px;
  gap: 16px;
}

.sidebar {
  width: 260px;
  border-right: 1px solid #222;
  padding-right: 16px;
}

.surface-item {
  padding: 8px 10px;
  margin-bottom: 4px;
  border-radius: 4px;
  cursor: pointer;
}

.surface-item.active {
  background: #1b2333;
}

.content {
  flex: 1;
  border-radius: 6px;
  border: 1px solid #222;
  padding: 16px;
  background: #050814;
}

.iframe-container {
  width: 100%;
  height: 480px;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid #111827;
  background: #000;
}

.iframe-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}