diff --git a/frontend/dcViewer.css b/frontend/dcViewer.css
index a4d8dbe..c2ff846 100644
--- a/frontend/dcViewer.css
+++ b/frontend/dcViewer.css
@@ -359,6 +359,103 @@ header {
   display: none;
 }
 
+.side-panel.is-collapsed {
+  display: none !important;
+}
+
+.inspector-panel-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  min-height: 28px;
+  margin: 0 0 8px;
+}
+
+.inspector-panel-header h3 {
+  margin: 0;
+}
+
+.inspector-collapse-btn {
+  display: grid;
+  place-items: center;
+  width: 28px;
+  height: 28px;
+  margin: -2px -2px 0 8px;
+  padding: 0;
+  border: 0;
+  border-radius: 10px;
+  background: transparent;
+  color: var(--modal-btn-primary, var(--accent));
+  cursor: pointer;
+  font: inherit;
+  font-size: 18px;
+  font-weight: 900;
+  line-height: 1;
+  outline: none;
+  transition: background 140ms ease, transform 100ms ease;
+}
+
+.inspector-collapse-btn:hover {
+  background: var(--nodedc-glass-control-hover);
+}
+
+.inspector-collapse-btn:active {
+  transform: translateY(1px);
+}
+
+.inspector-collapse-btn:focus,
+.inspector-collapse-btn:focus-visible {
+  outline: none;
+  box-shadow: none;
+}
+
+.inspector-restore-tray {
+  position: fixed;
+  right: 12px;
+  bottom: 12px;
+  width: 320px;
+  padding: 0 14px;
+  z-index: 12;
+  box-sizing: border-box;
+  pointer-events: none;
+}
+
+.inspector-restore-button {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 100%;
+  height: 40px;
+  padding: 0 16px;
+  border: 0;
+  border-radius: 14px;
+  background: var(--modal-btn-primary, var(--accent));
+  color: var(--modal-btn-primary-contrast, #15170f);
+  box-shadow: var(--nodedc-glass-control-shadow);
+  cursor: pointer;
+  font: inherit;
+  font-size: 12px;
+  font-weight: 800;
+  line-height: 1;
+  text-transform: uppercase;
+  pointer-events: auto;
+  transition: filter 140ms ease, transform 100ms ease;
+}
+
+.inspector-restore-button:hover {
+  filter: brightness(1.05);
+}
+
+.inspector-restore-button:active {
+  transform: translateY(1px);
+}
+
+.inspector-restore-button:focus,
+.inspector-restore-button:focus-visible {
+  outline: none;
+  box-shadow: none;
+}
+
 .panel-section {
   background: transparent;
   border: none;
@@ -371,6 +468,10 @@ header {
   font-size: 15px;
 }
 
+.panel-section .inspector-panel-header h3 {
+  margin: 0;
+}
+
 .panel-section p,
 .panel-section ul {
   margin: 0;
diff --git a/frontend/dcViewer.js b/frontend/dcViewer.js
index 6bc624b..286b628 100644
--- a/frontend/dcViewer.js
+++ b/frontend/dcViewer.js
@@ -16,6 +16,9 @@ const dropZone = document.getElementById("dropZone");
 const viewerWrapper = document.querySelector(".viewer-wrapper");
 const headerEl = document.querySelector("header");
 const sidePanelEl = document.querySelector(".side-panel");
+const inspectorCollapseButton = document.getElementById("inspectorCollapseButton");
+const inspectorRestoreTray = document.getElementById("inspectorRestoreTray");
+const inspectorRestoreButton = document.getElementById("inspectorRestoreButton");
 const fileInput = document.getElementById("fileInput");
 const chooseFileBtn = document.getElementById("chooseFile");
 const examplesBar = document.getElementById("examplesBar");
@@ -220,6 +223,7 @@ let activeDisplayMode = "source";
 let activeLightingMode = "ambient";
 let activeNavigationAxis = "auto";
 let activeZoomSpeed = 20;
+let inspectorCollapsed = false;
 let displayModeSelect = null;
 let lightingModeSelect = null;
 let navigationAxisSelect = null;
@@ -1077,7 +1081,13 @@ const rebuildNavCube = (sdk) => {
 
 const updatePanelsVisibility = () => {
   const hasModels = activeModels.length > 0;
-  if (sidePanelEl) sidePanelEl.style.display = hasModels ? "flex" : "none";
+  if (sidePanelEl) {
+    sidePanelEl.classList.toggle("is-collapsed", hasModels && inspectorCollapsed);
+    sidePanelEl.style.display = hasModels && !inspectorCollapsed ? "flex" : "none";
+  }
+  if (inspectorRestoreTray) {
+    inspectorRestoreTray.hidden = !hasModels || !inspectorCollapsed;
+  }
   if (treeContainer) treeContainer.classList.toggle("hidden", !hasModels);
   const showActions = hasModels || !!currentProjectMeta || !!lastAttemptedProjectId;
   if (saveProjectSection) {
@@ -1104,6 +1114,15 @@ const updatePanelsVisibility = () => {
   }
 };
 
+const setInspectorCollapsed = (collapsed) => {
+  inspectorCollapsed = !!collapsed;
+  if (inspectorCollapseButton) {
+    inspectorCollapseButton.setAttribute("aria-expanded", String(!inspectorCollapsed));
+  }
+  updatePanelsVisibility();
+  focusCanvasAndControls();
+};
+
 const centerFromAABB = (aabb) => {
   if (!Array.isArray(aabb) || aabb.length !== 6) return [0, 0, 0];
   return [
@@ -3685,6 +3704,8 @@ const loadProjectSnapshot = async (project) => {
     });
     zoomSpeedControl.replaceChildren(zoomSpeedSlider);
   }
+  inspectorCollapseButton?.addEventListener("click", () => setInspectorCollapsed(true));
+  inspectorRestoreButton?.addEventListener("click", () => setInspectorCollapsed(false));
   loadProjectsList().catch(() => {
     templatesMenu?.setData({ templates: templateFallbacks, projects: [], error: "API недоступно" });
   });
diff --git a/frontend/index.html b/frontend/index.html
index 632bb06..5538782 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -124,9 +124,18 @@
       </div>
     </section>
 
-    <aside class="side-panel">
+    <aside class="side-panel" id="viewerInspector">
       <div class="panel-section">
-        <h3>Инспектор</h3>
+        <div class="inspector-panel-header">
+          <h3>Инспектор</h3>
+          <button
+            class="inspector-collapse-btn"
+            id="inspectorCollapseButton"
+            type="button"
+            title="Свернуть инспектор"
+            aria-label="Свернуть инспектор"
+          >▁</button>
+        </div>
         <div id="treeContainer" class="tree"></div>
         <div class="inspector-controls">
           <div class="inspector-control-row inspector-control-row--half" id="displayModeControl">
@@ -190,6 +199,9 @@
         <button class="secondary-btn danger-btn" id="deleteProjectButton" type="button">Удалить проект</button>
       </div>
     </aside>
+    <div class="inspector-restore-tray" id="inspectorRestoreTray" hidden>
+      <button class="inspector-restore-button" id="inspectorRestoreButton" type="button">Инспектор</button>
+    </div>
   </main>
 
   <div id="templatesPanel" class="templates-panel hidden"></div>