:root {
  color-scheme: light dark;
  --border: rgba(128, 128, 128, 0.35);
  --accent: #3578e5;
  --bg: Canvas;
  --fg: CanvasText;
  --muted: color-mix(in srgb, CanvasText 70%, transparent);
  --font: 13px system-ui, -apple-system, Segoe UI, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font: var(--font);
}

#bar {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  min-height: 44px;
}

#bar button,
#bar a {
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: var(--font);
  text-decoration: none;
}

#bar button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.muted {
  opacity: 0.7;
}

.spacer {
  flex: 1;
}

.auto {
  display: flex;
  gap: 6px;
  align-items: center;
}

#main {
  display: flex;
  height: calc(100% - 44px);
  min-height: 0;
}

#sidebar {
  width: 250px;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  padding: 8px;
  flex-shrink: 0;
}

#sidebar.hidden {
  display: none;
}

#sidebar button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 4px 8px;
  border: none;
  background: transparent;
  color: inherit;
  border-radius: 5px;
  cursor: pointer;
  font: var(--font);
}

#sidebar button.cat {
  font-weight: 700;
  opacity: 0.85;
}

#sidebar button.doc.active {
  background: var(--accent);
  color: #fff;
}

#editor,
.studio-editor-frame {
  flex: 1;
  border: none;
  min-width: 0;
  border-right: 1px solid var(--border);
}

#preview {
  flex: 1;
  border: none;
  min-width: 0;
}

#sidebar .empty {
  padding: 12px;
  opacity: 0.7;
}