Add Linux basics mindmap

styles.css

@@ -85,17 +85,24 @@ h1 {
 
 .hud-actions {
   display: flex;
+  align-items: flex-start;
+  flex-wrap: wrap;
+  justify-content: flex-end;
   gap: 8px;
   padding-top: 8px;
 }
 
-.hud-actions button {
+.hud-actions button,
+.map-switcher {
   border: 1px solid rgba(191, 208, 232, 0.92);
   border-radius: 8px;
-  padding: 10px 13px;
   background: rgba(255, 255, 255, 0.9);
   color: var(--text);
   box-shadow: 0 12px 28px rgba(18, 32, 51, 0.1);
+}
+
+.hud-actions button {
+  padding: 10px 13px;
   cursor: pointer;
 }
 
@@ -103,6 +110,23 @@ h1 {
   border-color: var(--accent);
 }
 
+.map-switcher {
+  display: flex;
+  gap: 2px;
+  padding: 3px;
+}
+
+.map-switcher .map-tab {
+  border: 0;
+  box-shadow: none;
+  background: transparent;
+}
+
+.map-switcher .map-tab.is-selected {
+  background: var(--accent-deep);
+  color: #fff;
+}
+
 .canvas-help {
   position: fixed;
   left: 18px;