diff --git a/index.html b/index.html
index b9c26d3..5405135 100644
--- a/index.html
+++ b/index.html
@@ -17,11 +17,25 @@
         #measureLabel { position: fixed; top: 10px; left: 50%; transform: translateX(-50%); background: rgba(13,31,45,0.92); color: #ffd166; padding: 8px 14px; border-radius: 6px; font-size: 14px; display: none; pointer-events: none; z-index: 5; }
         #panel button { margin-top: 8px; width: 100%; padding: 6px; background: #10b981; color: #0d1f2d; border: none; border-radius: 4px; font-weight: 700; cursor: pointer; }
         #hint { position: fixed; bottom: 8px; left: 10px; color: #9fb3c8; font-size: 12px; }
+        canvas { touch-action: none; }
+        #panel .phead { display: flex; justify-content: space-between; align-items: center; }
+        #panel .ptoggle { display: none; margin: 0; width: auto; padding: 4px 10px; font-size: 12px; }
+        @media (max-width: 720px) {
+            #panel { top: auto; bottom: 0; left: 0; right: 0; min-width: 0; max-width: none; max-height: 48vh; overflow-y: auto; border-radius: 12px 12px 0 0; padding: 10px 12px calc(10px + env(safe-area-inset-bottom)); font-size: 13px; }
+            #panel .ptoggle { display: inline-block; }
+            #panel.collapsed > *:not(.phead) { display: none; }
+            #panel button.vb { min-height: 40px; font-size: 14px; }
+            #panel button { min-height: 40px; }
+            #panel input[type=checkbox] { width: 18px; height: 18px; }
+            #panel input[type=range] { height: 28px; }
+            #hint { display: none; }
+            #measureLabel { top: 8px; font-size: 13px; max-width: 92vw; box-sizing: border-box; text-align: center; }
+        }
     </style>
 </head>
 <body>
     <div id="panel">
-        <h4>부재 구성 (규격)</h4>
+        <div class="phead"><h4>부재 구성 (규격)</h4><button id="btnPanel" class="ptoggle">접기</button></div>
         <div id="counts">로딩 중...</div>
         <button id="btnFit">줌핏 (보이는 부재)</button>
         <div class="vrow">
@@ -36,7 +50,7 @@
         </div>
         <label style="display:block;margin-top:6px;cursor:pointer"><input type="checkbox" id="chkExc" checked> 굴착면 표시 (벽체 내측면)</label>
     </div>
-    <div id="hint">드래그: 회전 · 휠: 줌(커서 방향) · 우클릭 드래그: 이동</div>
+    <div id="hint">드래그: 회전 · 휠·두 손가락: 줌 · 우클릭 드래그: 이동</div>
     <canvas id="canvas"></canvas>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
     <script>
@@ -203,6 +217,11 @@
             .catch(err => { countsEl.textContent = '오류: ' + err.message; });
 
         document.getElementById('btnFit').addEventListener('click', fitVisible);
+        const panelEl = document.getElementById('panel');
+        document.getElementById('btnPanel').addEventListener('click', e => {
+            const collapsed = panelEl.classList.toggle('collapsed');
+            e.target.textContent = collapsed ? '펼치기' : '접기';
+        });
 
         const VIEWS = {
             front: { theta: Math.PI / 2, phi: Math.PI / 2 },
@@ -277,18 +296,37 @@
         });
         document.getElementById('btnClear').addEventListener('click', clearMeasure);
 
-        let mode = null, lastX = 0, lastY = 0, downX = 0, downY = 0;
+        let mode = null, lastX = 0, lastY = 0, downX = 0, downY = 0, pinchDist = 0;
+        const pointers = new Map();
+        const pinchSpan = () => {
+            const [a, b] = [...pointers.values()];
+            return Math.hypot(a.x - b.x, a.y - b.y);
+        };
         canvas.addEventListener('contextmenu', e => e.preventDefault());
-        canvas.addEventListener('mousedown', e => {
-            mode = e.button === 2 ? 'pan' : 'rotate';
-            lastX = e.clientX; lastY = e.clientY;
-            downX = e.clientX; downY = e.clientY;
+        canvas.addEventListener('pointerdown', e => {
+            canvas.setPointerCapture(e.pointerId);
+            pointers.set(e.pointerId, { x: e.clientX, y: e.clientY });
+            if (pointers.size === 1) {
+                mode = e.button === 2 ? 'pan' : 'rotate';
+                lastX = e.clientX; lastY = e.clientY;
+                downX = e.clientX; downY = e.clientY;
+            } else if (pointers.size === 2) {
+                mode = 'pinch';
+                pinchDist = pinchSpan();
+                zoomPivot = target.clone();
+            }
         });
-        window.addEventListener('mouseup', e => {
-            if (measuring && mode === 'rotate' && Math.hypot(e.clientX - downX, e.clientY - downY) < 4) pickPoint(e);
-            mode = null;
-        });
-        window.addEventListener('mousemove', e => {
+        canvas.addEventListener('pointermove', e => {
+            if (!pointers.has(e.pointerId)) return;
+            pointers.set(e.pointerId, { x: e.clientX, y: e.clientY });
+            if (mode === 'pinch') {
+                const d = pinchSpan();
+                if (d > 0 && pinchDist > 0) {
+                    zoomTarget = Math.min(1e6, Math.max(0.05, (zoomTarget ?? radius) * (pinchDist / d)));
+                }
+                pinchDist = d;
+                return;
+            }
             if (!mode) return;
             const dx = e.clientX - lastX, dy = e.clientY - lastY;
             lastX = e.clientX; lastY = e.clientY;
@@ -304,6 +342,20 @@
             }
             updateCamera();
         });
+        const endPointer = e => {
+            if (!pointers.has(e.pointerId)) return;
+            if (measuring && mode === 'rotate' && pointers.size === 1 && Math.hypot(e.clientX - downX, e.clientY - downY) < 6) pickPoint(e);
+            pointers.delete(e.pointerId);
+            if (pointers.size === 0) {
+                mode = null;
+            } else if (pointers.size === 1) {
+                mode = 'rotate';
+                const p = [...pointers.values()][0];
+                lastX = p.x; lastY = p.y;
+            }
+        };
+        canvas.addEventListener('pointerup', endPointer);
+        canvas.addEventListener('pointercancel', endPointer);
 
         const raycaster = new THREE.Raycaster();
         const ground = new THREE.Plane(new THREE.Vector3(0, 0, 1), 0);