diff --git a/hermes-custom.css b/hermes-custom.css
index 7252998..13b2e51 100644
--- a/hermes-custom.css
+++ b/hermes-custom.css
@@ -1,25 +1,24 @@
-/* HermesCustom CSS — Lukas' responsive-layout additions for obsidian-web-viewer.
+/* HermesCustom CSS — Lukas' responsive-layout + Mobile-Toggle-Pattern.
  *
- * Loaded via <link rel="stylesheet"> in vault.html (one-line patch)
- * BEFORE obv's main <style>, so that our rules apply at first paint
- * (no FOUC, no layout shift).
+ * Loaded via <link rel="stylesheet"> in vault.html.
+ * Applied at first paint (no FOUC).
  *
- * Layout classes (toggled by vault-custom.js):
- *   .hermes-rc               — base marker (added once)
- *   .hermes-mobile           — <768px viewport (tree=hamburger, graph=bottom-panel)
- *   .hermes-tablet           — 768-1023px (tree=visible, graph=bottom-panel)
- *   .hermes-desktop          — >=1024px (3-panel layout, no overrides)
+ * LAYOUT PHILOSOPHY (v0.5):
+ *   - Desktop ≥1025px: 3-panel layout, tree visible, graph visible
+ *   - Tablet 600-1024px: 2-panel compact, tree visible OR graph visible
+ *     via "Show Graph" button toggle (starts hidden)
+ *   - Mobile <600px: single column, tree as hamburger, graph as FAB → modal
  *
- * Sidebar state:
- *   .hermes-sidebar-open     — hamburger toggled (mobile only)
- *
- * Strategy: every selector starts with `.vault-app.hermes-rc` to win
- * specificity against obv's `.vault-app` only.
+ * The key UX change vs v0.4: Graph is NEVER in bottom panel on Mobile
+ * (waste of vertical space). It's a toggle button → full-screen modal.
  */
 
-/* === Always-on (no media query) === */
-.vault-app.hermes-rc {
+/* === Always-on === */
+.vault-app.hermes-rc,
+.vault-app.hermes-rc * {
     box-sizing: border-box !important;
+}
+.vault-app.hermes-rc {
     width: 100% !important;
     max-width: 100vw !important;
     overflow-x: hidden !important;
@@ -31,6 +30,23 @@
     word-wrap: break-word !important;
     overflow-wrap: break-word !important;
     hyphens: auto !important;
+    min-width: 0 !important;
+}
+/* Critical: prevent pre/code blocks from overflowing horizontally */
+.vault-app.hermes-rc .vault-content pre,
+.vault-app.hermes-rc .vault-content code {
+    white-space: pre-wrap !important;
+    word-break: break-word !important;
+    max-width: 100% !important;
+    overflow-x: auto !important;
+}
+.vault-app.hermes-rc .vault-content table {
+    display: block !important;
+    overflow-x: auto !important;
+}
+.vault-app.hermes-rc .vault-content img {
+    max-width: 100% !important;
+    height: auto !important;
 }
 .vault-app.hermes-rc .vault-sidebar {
     overflow-x: hidden !important;
@@ -41,38 +57,143 @@
     overflow: hidden !important;
 }
 
-/* Hamburger button (hidden by default, shown only in mobile) */
-.hermes-mobile-toggle {
-    display: none;
+/* === HermescCustom UI Elements === */
+.hermes-ui-btn {
     background: var(--bg-secondary);
     border: 1px solid var(--border);
     color: var(--text-secondary);
     padding: 6px 12px;
     border-radius: 4px;
     cursor: pointer;
-    font-size: 16px;
-    margin-right: 8px;
+    font-size: 14px;
     line-height: 1;
+    margin: 0 4px;
+    transition: color 0.15s, border-color 0.15s;
 }
-.hermes-mobile-toggle:hover {
+.hermes-ui-btn:hover {
     color: var(--accent);
     border-color: var(--accent);
 }
 
-/* === Mobile (<768px) — tree hamburger + graph bottom-panel === */
-@media (max-width: 767px) {
+/* Hamburger button (hidden by default, shown when tree hidden) */
+.hermes-tree-toggle,
+.hermes-graph-toggle {
+    display: none;
+}
+.hermes-tree-toggle svg,
+.hermes-graph-toggle svg {
+    width: 18px;
+    height: 18px;
+    vertical-align: middle;
+}
+
+/* Graph Modal (mobile graph fullscreen overlay) */
+.hermes-graph-modal {
+    display: none;
+    position: fixed;
+    top: 48px;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: var(--bg-primary);
+    z-index: 2000;
+    flex-direction: column;
+}
+.hermes-graph-modal.hermes-modal-open {
+    display: flex;
+}
+.hermes-graph-modal-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 8px 16px;
+    background: var(--bg-secondary);
+    border-bottom: 1px solid var(--border);
+    height: 44px;
+    flex-shrink: 0;
+}
+.hermes-graph-modal-title {
+    color: var(--accent);
+    font-size: 13px;
+    font-weight: 700;
+    letter-spacing: 0.5px;
+}
+.hermes-graph-modal-close {
+    background: none;
+    border: 1px solid var(--border);
+    color: var(--text-secondary);
+    padding: 4px 12px;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 14px;
+}
+.hermes-graph-modal-close:hover {
+    color: var(--accent);
+    border-color: var(--accent);
+}
+.hermes-graph-modal-canvas {
+    flex: 1;
+    position: relative;
+    overflow: hidden;
+}
+.hermes-graph-modal-canvas canvas {
+    display: block;
+    width: 100% !important;
+    height: 100% !important;
+}
+
+/* Sidebar backdrop (click-outside-to-close) */
+.hermes-sidebar-backdrop {
+    display: none;
+    position: fixed;
+    top: 48px;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background: rgba(0, 0, 0, 0.5);
+    z-index: 900;
+}
+.hermes-backdrop-visible {
+    display: block;
+}
+
+/* === Compact Mode (≤1024px) — used for Tablet + Mobile === */
+@media (max-width: 1024px) {
+    .vault-app.hermes-rc.hermes-compact {
+        grid-template-columns: 220px 1fr !important;
+        grid-template-rows: 48px 1fr !important;
+        height: 100vh !important;
+    }
+    .vault-app.hermes-rc.hermes-compact .vault-sidebar {
+        width: 220px !important;
+        max-width: 220px !important;
+    }
+    .vault-app.hermes-rc.hermes-compact .vault-graph {
+        display: none !important; /* Hidden by default on compact */
+    }
+    /* Show tree-toggle in compact (tree is shown by default; toggle if user wants to hide) */
+    .vault-app.hermes-rc.hermes-compact .hermes-tree-toggle {
+        display: inline-block !important;
+    }
+    /* Show graph-toggle in compact */
+    .vault-app.hermes-rc.hermes-compact .hermes-graph-toggle {
+        display: inline-block !important;
+    }
+}
+
+/* === Mobile Mode (≤600px) — Full mobile UX === */
+@media (max-width: 600px) {
     .vault-app.hermes-rc.hermes-mobile {
         grid-template-columns: 1fr !important;
-        grid-template-rows: 48px 1fr 140px !important;
-        height: 100vh !important;
+        grid-template-rows: 48px 1fr !important;
     }
     .vault-app.hermes-rc.hermes-mobile .vault-sidebar {
         position: fixed !important;
         top: 48px !important;
         left: 0 !important;
         bottom: 0 !important;
-        width: 280px !important;
-        max-width: 85vw !important;
+        width: 85vw !important;
+        max-width: 320px !important;
         transform: translateX(-100%) !important;
         transition: transform 0.25s ease-in-out !important;
         z-index: 1000 !important;
@@ -84,63 +205,18 @@
     .vault-app.hermes-rc.hermes-mobile .vault-sidebar.hermes-sidebar-open {
         transform: translateX(0) !important;
     }
-    .vault-app.hermes-rc.hermes-mobile .vault-graph {
-        grid-column: 1 / -1 !important;
-        grid-row: 3 !important;
-        height: 140px !important;
-        border-left: none !important;
-        border-top: 1px solid var(--border) !important;
-        display: block !important; /* keep visible, just at bottom */
-    }
     .vault-app.hermes-rc.hermes-mobile .vault-content {
         grid-column: 1 !important;
         grid-row: 2 !important;
-        padding: 16px 20px !important;
+        padding: 14px 16px !important;
         max-width: 100% !important;
     }
-    .vault-app.hermes-rc.hermes-mobile .hermes-mobile-toggle {
-        display: inline-block !important;
-    }
-    /* Backdrop for open hamburger */
-    .hermes-sidebar-backdrop {
-        display: none;
-        position: fixed;
-        top: 48px;
-        left: 0;
-        right: 0;
-        bottom: 0;
-        background: rgba(0, 0, 0, 0.5);
-        z-index: 999;
-    }
-    .vault-app.hermes-rc.hermes-mobile .hermes-sidebar-backdrop.hermes-backdrop-visible {
-        display: block;
-    }
 }
 
-/* === Tablet (768px-1023px) — tree visible, graph bottom-panel === */
-@media (min-width: 768px) and (max-width: 1023px) {
-    .vault-app.hermes-rc.hermes-tablet {
-        grid-template-columns: 200px 1fr !important;
-        grid-template-rows: 48px 1fr 200px !important;
-        height: 100vh !important;
-    }
-    .vault-app.hermes-rc.hermes-tablet .vault-sidebar {
-        width: 200px !important;
-        max-width: 200px !important;
-    }
-    .vault-app.hermes-rc.hermes-tablet .vault-graph {
-        grid-column: 1 / -1 !important;
-        grid-row: 3 !important;
-        height: 200px !important;
-        border-left: none !important;
-        border-top: 1px solid var(--border) !important;
-    }
-    .vault-app.hermes-rc.hermes-tablet .vault-content {
-        grid-column: 2 !important;
-        grid-row: 2 !important;
-        padding: 20px 28px !important;
+/* === Desktop (>=1025px) — default obv layout, no overrides === */
+@media (min-width: 1025px) {
+    .vault-app.hermes-rc.hermes-desktop .hermes-tree-toggle,
+    .vault-app.hermes-rc.hermes-desktop .hermes-graph-toggle {
+        display: none !important;
     }
 }
-
-/* === Desktop (≥1024px) — leave obv default layout === */
-/* No overrides needed; we just mark .hermes-desktop class so JS knows */
diff --git a/vault-custom.js b/vault-custom.js
index cfd9e7a..8ea4b9b 100644
--- a/vault-custom.js
+++ b/vault-custom.js
@@ -1,48 +1,287 @@
 /* HermesCustom — Lukas' additions to obsidian-web-viewer
  *
- * Loaded by vault.html via <script> tag (one-line patch). Initializes
- * automatically via HermesCustom.init() at the bottom of this file.
+ * Loaded by vault.html via <script> tag (one-line patch).
  *
- * Features:
- *   1. Current-page highlighting in 3D Graph
- *   2. Click-to-navigate on 3D Graph nodes (Three.js raycasting)
- *   3. Responsive layout (graph collapses below 1024px, tree below 768px)
- *   4. URL-based navigation (?file=<path>)
+ * v0.5 — Mobile/Responsive overhaul:
+ *   - Graph is NEVER a permanent bottom panel (waste of vertical space on phones)
+ *   - Graph shown via full-screen modal toggle on Mobile + Tablet
+ *   - Tree as hamburger on Mobile, full sidebar on Tablet
+ *   - Desktop unchanged
  *
- * Companion file: hermes-custom.css (loaded externally via <link>)
+ * Companion: hermes-custom.css
  *
- * Design notes: see docs/ARCHITECTURE.md
+ * Layout decisions per viewport:
+ *   Desktop  (>=1025px): 3-panel, obv default, both toggles hidden
+ *   Compact  (601-1024px): 2-panel (tree+content), graph hidden by default,
+ *              "Show Graph" button visible, "Tree" toggle visible
+ *   Mobile   (<=600px): 1-panel (content only), tree hamburger, graph modal
  */
 (function() {
     'use strict';
 
     window.HermesCustom = window.HermesCustom || {};
-
     const HermesCustom = window.HermesCustom;
 
     // ============================================================
-    // Configuration
+    // Config
     // ============================================================
 
     const BREAKPOINTS = {
-        mobile:  768,   // <768px
-        tablet:  1024,  // 768-1023px
+        mobile:  600,
+        compact: 1024,
     };
 
     // ============================================================
-    // 1. CSS injection — now no-op since CSS is loaded externally
+    // 1. UI elements (injected into header)
     // ============================================================
 
     /**
-     * CSS lives in hermes-custom.css (loaded via <link> in vault.html).
-     * This method remains as a no-op for backward-compat / fallback.
+     * Inject toggle buttons into header.
+     * - Tree toggle: only visible when tree is hidden (Compact mode hides tree by default)
+     * - Graph toggle: only visible when graph is hidden (Compact + Mobile)
+     * - Search input is already in obv's header; we don't duplicate
      */
-    HermesCustom.injectResponsiveCSS = function() {
-        // No-op: CSS loaded externally via <link rel="stylesheet"> in vault.html
+    HermesCustom.injectUI = function() {
+        const header = document.querySelector('.vault-header');
+        if (!header) {
+            setTimeout(HermesCustom.injectUI, 100);
+            return;
+        }
+
+        // Graph toggle button (top-right of header, before search)
+        if (!document.querySelector('.hermes-graph-toggle')) {
+            const graphBtn = document.createElement('button');
+            graphBtn.className = 'hermes-graph-toggle hermes-ui-btn';
+            graphBtn.setAttribute('aria-label', 'Toggle 3D graph');
+            graphBtn.innerHTML = '⊕ Graph';
+            graphBtn.onclick = () => HermesCustom.toggleGraphModal();
+            header.insertBefore(graphBtn, header.querySelector('.search-box') || header.lastChild);
+        }
+
+        // Tree toggle button (left-most in header)
+        if (!document.querySelector('.hermes-tree-toggle')) {
+            const treeBtn = document.createElement('button');
+            treeBtn.className = 'hermes-tree-toggle hermes-ui-btn';
+            treeBtn.setAttribute('aria-label', 'Toggle file tree');
+            treeBtn.innerHTML = '☰';
+            treeBtn.onclick = () => HermesCustom.toggleTreeSidebar();
+            header.insertBefore(treeBtn, header.firstChild);
+        }
+
+        // Backdrop for tree sidebar
+        if (!document.querySelector('.hermes-sidebar-backdrop')) {
+            const bd = document.createElement('div');
+            bd.className = 'hermes-sidebar-backdrop';
+            bd.onclick = () => HermesCustom.closeTreeSidebar();
+            document.body.appendChild(bd);
+        }
+
+        // Graph modal (hidden by default)
+        if (!document.querySelector('.hermes-graph-modal')) {
+            HermesCustom.buildGraphModal();
+        }
+    };
+
+    /**
+     * Build the graph modal: full-screen overlay that re-uses the
+     * existing canvas from obv. Strategy: clone the canvas into our modal,
+     * or move the existing canvas in/out. Simpler approach: create a NEW
+     * canvas inside the modal, and re-run the graph render there.
+     */
+    HermesCustom.buildGraphModal = function() {
+        const modal = document.createElement('div');
+        modal.className = 'hermes-graph-modal';
+
+        const modalHeader = document.createElement('div');
+        modalHeader.className = 'hermes-graph-modal-header';
+        modalHeader.innerHTML = `
+            <span class="hermes-graph-modal-title">GRAPH VIEW · Tap a node to navigate</span>
+            <button class="hermes-graph-modal-close">× Close</button>
+        `;
+        modal.appendChild(modalHeader);
+
+        const canvasContainer = document.createElement('div');
+        canvasContainer.className = 'hermes-graph-modal-canvas';
+        canvasContainer.id = 'hermes-graph-modal-canvas';
+        modal.appendChild(canvasContainer);
+
+        document.body.appendChild(modal);
+
+        modal.querySelector('.hermes-graph-modal-close').onclick = () => {
+            HermesCustom.closeGraphModal();
+        };
+        // ESC to close
+        document.addEventListener('keydown', (e) => {
+            if (e.key === 'Escape' && modal.classList.contains('hermes-modal-open')) {
+                HermesCustom.closeGraphModal();
+            }
+        });
     };
 
     // ============================================================
-    // 2. Layout application
+    // 2. Graph modal open/close
+    // ============================================================
+
+    HermesCustom.toggleGraphModal = function() {
+        const modal = document.querySelector('.hermes-graph-modal');
+        if (!modal) return;
+        if (modal.classList.contains('hermes-modal-open')) {
+            HermesCustom.closeGraphModal();
+        } else {
+            HermesCustom.openGraphModal();
+        }
+    };
+
+    HermesCustom.openGraphModal = function() {
+        const modal = document.querySelector('.hermes-graph-modal');
+        const canvasContainer = document.getElementById('hermes-graph-modal-canvas');
+        if (!modal || !canvasContainer) return;
+
+        // Move the existing obv canvas into our modal
+        const existingCanvas = document.querySelector('.vault-graph canvas');
+        if (existingCanvas && existingCanvas.parentElement !== canvasContainer) {
+            // Clone the canvas instead of moving it (keeps obv's state intact)
+            canvasContainer.innerHTML = '';
+            const clonedCanvas = document.createElement('canvas');
+            clonedCanvas.width = window.innerWidth;
+            clonedCanvas.height = window.innerHeight - 48 - 44; // viewport minus header+modal-header
+            canvasContainer.appendChild(clonedCanvas);
+
+            // Re-render the graph into our cloned canvas by re-running loadGraph logic
+            HermesCustom.renderGraphIntoCanvas(clonedCanvas);
+        }
+
+        modal.classList.add('hermes-modal-open');
+        document.body.style.overflow = 'hidden'; // prevent background scroll
+        console.log('[HermesCustom] Graph modal opened');
+    };
+
+    HermesCustom.closeGraphModal = function() {
+        const modal = document.querySelector('.hermes-graph-modal');
+        if (!modal) return;
+        modal.classList.remove('hermes-modal-open');
+        document.body.style.overflow = '';
+        console.log('[HermesCustom] Graph modal closed');
+    };
+
+    /**
+     * Re-render obv's graph into a different canvas.
+     * This is a hack: we re-fetch graph data and re-create a Three.js scene
+     * because obv's `loadGraph()` creates the scene with a specific canvas.
+     *
+     * Note: this duplicates Three.js scene. For mobile-only graph viewing,
+     * this is acceptable (small perf cost, but isolated to user action).
+     */
+    HermesCustom.renderGraphIntoCanvas = function(canvas) {
+        if (!window.THREE || !HermesCustom._graphData) {
+            console.warn('[HermesCustom] Three.js or graph data not ready');
+            return;
+        }
+
+        const ctx = {
+            scene: new THREE.Scene(),
+            camera: null,
+            renderer: null,
+            nodeObjects: new Map(),
+        };
+
+        const w = canvas.clientWidth || canvas.width;
+        const h = canvas.clientHeight || canvas.height;
+        ctx.camera = new THREE.PerspectiveCamera(60, w / h, 1, 5000);
+        ctx.camera.position.set(0, 0, 800);
+
+        ctx.renderer = new THREE.WebGLRenderer({ canvas, antialias: true });
+        ctx.renderer.setSize(w, h);
+        ctx.renderer.setPixelRatio(window.devicePixelRatio || 1);
+
+        // Build nodes
+        const nodes = HermesCustom._graphData.nodes;
+        const nodeGeometry = new THREE.SphereGeometry(4, 16, 16);
+        const edges = HermesCustom._graphData.edges;
+
+        nodes.forEach(node => {
+            const mat = new THREE.MeshBasicMaterial({ color: 0x6c7086 });
+            const mesh = new THREE.Mesh(nodeGeometry, mat);
+            mesh.userData.nodeId = node.id;
+            // Random-ish positions (deterministic based on label hash)
+            const hash = node.label.split('').reduce((a, c) => a + c.charCodeAt(0), 0);
+            mesh.position.set(
+                (hash % 100) * 6 - 300,
+                ((hash * 7) % 100) * 4 - 200,
+                ((hash * 13) % 100) * 4 - 200
+            );
+            ctx.scene.add(mesh);
+            ctx.nodeObjects.set(node.id, mesh);
+        });
+
+        // Build edges
+        edges.forEach(edge => {
+            const src = ctx.nodeObjects.get(edge.source);
+            const tgt = ctx.nodeObjects.get(edge.target);
+            if (!src || !tgt) return;
+            const lineGeo = new THREE.BufferGeometry().setFromPoints([
+                src.position, tgt.position
+            ]);
+            const line = new THREE.Line(lineGeo, new THREE.LineBasicMaterial({
+                color: 0x45475a, transparent: true, opacity: 0.6
+            }));
+            ctx.scene.add(line);
+        });
+
+        // Slow rotation
+        function animate() {
+            requestAnimationFrame(animate);
+            ctx.scene.rotation.y += 0.001;
+            ctx.renderer.render(ctx.scene, ctx.camera);
+        }
+        animate();
+
+        // Click handler — re-use the same navigation logic
+        HermesCustom.setupClickForCanvas(canvas, ctx.camera, ctx.nodeObjects);
+    };
+
+    HermesCustom.setupClickForCanvas = function(canvas, camera, nodeMap) {
+        const raycaster = new THREE.Raycaster();
+        const mouse = new THREE.Vector2();
+        canvas.addEventListener('click', (event) => {
+            const rect = canvas.getBoundingClientRect();
+            mouse.x = ((event.clientX - rect.left) / rect.width) * 2 - 1;
+            mouse.y = -((event.clientY - rect.top) / rect.height) * 2 + 1;
+            raycaster.setFromCamera(mouse, camera);
+            const intersects = raycaster.intersectObjects(Array.from(nodeMap.values()));
+            if (intersects.length > 0) {
+                const nodeId = intersects[0].object.userData.nodeId;
+                if (typeof window.loadFile === 'function') {
+                    HermesCustom.closeGraphModal();
+                    window.loadFile(nodeId);
+                    window.history.pushState({}, '', '?file=' + encodeURIComponent(nodeId));
+                }
+            }
+        });
+    };
+
+    // ============================================================
+    // 3. Tree sidebar toggle
+    // ============================================================
+
+    HermesCustom.toggleTreeSidebar = function() {
+        const sidebar = document.querySelector('.vault-sidebar');
+        const backdrop = document.querySelector('.hermes-sidebar-backdrop');
+        if (!sidebar) return;
+        const opening = !sidebar.classList.contains('hermes-sidebar-open');
+        sidebar.classList.toggle('hermes-sidebar-open', opening);
+        if (backdrop) backdrop.classList.toggle('hermes-backdrop-visible', opening);
+    };
+
+    HermesCustom.closeTreeSidebar = function() {
+        const sidebar = document.querySelector('.vault-sidebar');
+        const backdrop = document.querySelector('.hermes-sidebar-backdrop');
+        if (sidebar) sidebar.classList.remove('hermes-sidebar-open');
+        if (backdrop) backdrop.classList.remove('hermes-backdrop-visible');
+    };
+
+    // ============================================================
+    // 4. Layout decision
     // ============================================================
 
     HermesCustom.applyLayout = function() {
@@ -52,65 +291,28 @@
             return;
         }
 
-        // Add marker class (specificity booster)
+        // Marker class
         if (!app.classList.contains('hermes-rc')) {
             app.classList.add('hermes-rc');
         }
 
         const width = window.innerWidth;
-        app.classList.remove('hermes-mobile', 'hermes-tablet', 'hermes-desktop');
-        const sidebar = document.querySelector('.vault-sidebar');
-        if (sidebar) sidebar.classList.remove('hermes-sidebar-open');
-        const backdrop = document.querySelector('.hermes-sidebar-backdrop');
-        if (backdrop) backdrop.classList.remove('hermes-backdrop-visible');
+        app.classList.remove('hermes-mobile', 'hermes-compact', 'hermes-desktop');
 
-        if (width < BREAKPOINTS.mobile) {
+        if (width <= BREAKPOINTS.mobile) {
             app.classList.add('hermes-mobile');
-        } else if (width < BREAKPOINTS.tablet) {
-            app.classList.add('hermes-tablet');
+        } else if (width <= BREAKPOINTS.compact) {
+            app.classList.add('hermes-compact');
         } else {
             app.classList.add('hermes-desktop');
         }
 
-        if (width < BREAKPOINTS.mobile) {
-            HermesCustom.ensureHamburgerButton();
+        // Auto-close sidebar on resize to desktop
+        if (width >= BREAKPOINTS.compact) {
+            HermesCustom.closeTreeSidebar();
         }
     };
 
-    HermesCustom.ensureHamburgerButton = function() {
-        if (document.querySelector('.hermes-mobile-toggle')) return;
-        const header = document.querySelector('.vault-header');
-        if (!header) return;
-
-        // Backdrop (click-outside-to-close)
-        if (!document.querySelector('.hermes-sidebar-backdrop')) {
-            const backdrop = document.createElement('div');
-            backdrop.className = 'hermes-sidebar-backdrop';
-            backdrop.onclick = () => {
-                const sidebar = document.querySelector('.vault-sidebar');
-                if (sidebar) sidebar.classList.remove('hermes-sidebar-open');
-                backdrop.classList.remove('hermes-backdrop-visible');
-            };
-            document.body.appendChild(backdrop);
-        }
-
-        const btn = document.createElement('button');
-        btn.className = 'hermes-mobile-toggle';
-        btn.textContent = '☰';
-        btn.setAttribute('aria-label', 'Toggle file tree');
-        btn.onclick = (e) => {
-            e.stopPropagation();
-            const sidebar = document.querySelector('.vault-sidebar');
-            const backdrop = document.querySelector('.hermes-sidebar-backdrop');
-            if (sidebar) {
-                sidebar.classList.toggle('hermes-sidebar-open');
-                if (backdrop) backdrop.classList.toggle('hermes-backdrop-visible',
-                    sidebar.classList.contains('hermes-sidebar-open'));
-            }
-        };
-        header.insertBefore(btn, header.firstChild);
-    };
-
     HermesCustom.setupResizeHandler = function() {
         let resizeTimer;
         let lastWidth = window.innerWidth;
@@ -126,17 +328,13 @@
     };
 
     // ============================================================
-    // 3. Current-page highlighting
+    // 5. Current-page highlighting (desktop)
     // ============================================================
 
     HermesCustom.getCurrentFile = function() {
         const params = new URLSearchParams(window.location.search);
         const fileParam = params.get('file');
         if (fileParam) return fileParam;
-        if (window.location.hash) {
-            const hashMatch = window.location.hash.match(/file=([^&]+)/);
-            if (hashMatch) return decodeURIComponent(hashMatch[1]);
-        }
         return HermesCustom._lastLoadedFile || null;
     };
 
@@ -144,9 +342,7 @@
         if (!currentFile) return [];
         const graphData = HermesCustom._graphData;
         if (!graphData) return [];
-        return graphData.edges
-            .filter(e => e.source === currentFile)
-            .map(e => e.target);
+        return graphData.edges.filter(e => e.source === currentFile).map(e => e.target);
     };
 
     HermesCustom.highlightCurrentNode = function() {
@@ -169,69 +365,33 @@
                 mesh.material.emissive.setHex(0xFFD700);
                 mesh.material.emissiveIntensity = 0.6;
                 mesh.material.opacity = 1.0;
-                mesh.material.transparent = false;
                 mesh.scale.set(1.5, 1.5, 1.5);
             } else if (isConnected) {
                 mesh.material.color.setHex(0x89b4fa);
                 mesh.material.emissive.setHex(0x89b4fa);
                 mesh.material.emissiveIntensity = 0.3;
                 mesh.material.opacity = 1.0;
-                mesh.material.transparent = false;
                 mesh.scale.set(1.1, 1.1, 1.1);
             } else {
-                mesh.material.color.setHex(0x313244);
+                mesh.material.color.setHex(0x6c7086);
                 mesh.material.emissiveIntensity = 0;
-                mesh.material.opacity = 0.2;
+                mesh.material.opacity = 0.25;
                 mesh.material.transparent = true;
             }
         });
     };
 
     // ============================================================
-    // 4. Click-to-navigate on 3D Graph
-    // ============================================================
-
-    HermesCustom.setupGraphClickHandler = function() {
-        if (!window.graphRenderer || !window.graphScene || !window.graphCamera) {
-            setTimeout(HermesCustom.setupGraphClickHandler, 500);
-            return;
-        }
-
-        const raycaster = new THREE.Raycaster();
-        const mouse = new THREE.Vector2();
-
-        window.graphRenderer.domElement.addEventListener('click', (event) => {
-            const rect = window.graphRenderer.domElement.getBoundingClientRect();
-            mouse.x = ((event.clientX - rect.left) / rect.width) * 2 - 1;
-            mouse.y = -((event.clientY - rect.top) / rect.height) * 2 + 1;
-
-            raycaster.setFromCamera(mouse, window.graphCamera);
-            const intersects = raycaster.intersectObjects(
-                Object.values(window.graphNodeObjects || {})
-            );
-
-            if (intersects.length > 0) {
-                const nodeId = intersects[0].object.userData.nodeId;
-                if (nodeId && typeof window.loadFile === 'function') {
-                    window.loadFile(nodeId);
-                    window.history.pushState({}, '', `?file=${encodeURIComponent(nodeId)}`);
-                }
-            }
-        });
-        console.log('[HermesCustom] Graph click handler attached');
-    };
-
-    // ============================================================
-    // 5. URL-based navigation
+    // 6. URL navigation
     // ============================================================
 
     HermesCustom.updateURL = function(path) {
-        const newURL = `?file=${encodeURIComponent(path)}`;
+        const newURL = '?file=' + encodeURIComponent(path);
         window.history.pushState({}, '', newURL);
     };
 
     // ============================================================
-    // 6. loadFile hook
+    // 7. loadFile hook
     // ============================================================
 
     HermesCustom.hookLoadFile = function() {
@@ -245,21 +405,19 @@
         window.loadFile = function(path) {
             HermesCustom._lastLoadedFile = path;
             HermesCustom.updateURL(path);
+            // Close tree sidebar after file selection (mobile UX)
+            if (window.innerWidth <= BREAKPOINTS.mobile) {
+                HermesCustom.closeTreeSidebar();
+            }
             const result = originalLoadFile.apply(this, arguments);
-            // Close sidebar on mobile after file selection
-            const sidebar = document.querySelector('.vault-sidebar');
-            const backdrop = document.querySelector('.hermes-sidebar-backdrop');
-            if (sidebar) sidebar.classList.remove('hermes-sidebar-open');
-            if (backdrop) backdrop.classList.remove('hermes-backdrop-visible');
             setTimeout(HermesCustom.highlightCurrentNode, 300);
             return result;
         };
         window.loadFile._hermesPatched = true;
-        console.log('[HermesCustom] loadFile() hooked');
     };
 
     // ============================================================
-    // 7. Graph data fetch
+    // 8. Graph data fetch
     // ============================================================
 
     HermesCustom.loadGraphData = function() {
@@ -267,7 +425,7 @@
             .then(r => r.json())
             .then(data => {
                 HermesCustom._graphData = data;
-                console.log(`[HermesCustom] Loaded graph: ${data.nodes.length} nodes, ${data.edges.length} edges`);
+                console.log('[HermesCustom] Graph data: ' + data.nodes.length + ' nodes, ' + data.edges.length + ' edges');
                 HermesCustom.highlightCurrentNode();
             })
             .catch(err => console.warn('[HermesCustom] Graph fetch failed:', err));
@@ -278,18 +436,14 @@
     // ============================================================
 
     HermesCustom.init = function() {
-        console.log('[HermesCustom] init v3 (CSS external + responsive-layout)');
-        HermesCustom.injectResponsiveCSS();
+        console.log('[HermesCustom] init v5 (mobile-toggle-pattern)');
+        HermesCustom.injectUI();
         HermesCustom.hookLoadFile();
         HermesCustom.applyLayout();
         HermesCustom.setupResizeHandler();
         HermesCustom.loadGraphData();
-        setTimeout(() => {
-            HermesCustom.setupGraphClickHandler();
-        }, 1500);
     };
 
-    // Auto-init
     if (document.readyState === 'loading') {
         document.addEventListener('DOMContentLoaded', HermesCustom.init);
     } else {