diff --git a/frontend/js/main.js b/frontend/js/main.js
index d10eb9d..f09ff24 100644
--- a/frontend/js/main.js
+++ b/frontend/js/main.js
@@ -1453,6 +1453,12 @@ async function showSessionDetail(sessionId) {
               pinch: { enabled: true },
               mode: "x",
               limits: { x: { minRange: 0.5 } },
+              onZoomStart: ({chart, event}) => {
+                // Allow wheel zoom (Ctrl+scroll) always; pinch only in fullscreen
+                if (event && event.type === "wheel") return true;
+                const wrap = chart.canvas.closest(".chart-wrap");
+                return wrap && wrap.classList.contains("chart-full");
+              },
             },
             pan: { enabled: false },
           },
@@ -1497,6 +1503,12 @@ async function showSessionDetail(sessionId) {
               pinch: { enabled: true },
               mode: "x",
               limits: { x: { minRange: 0.5 } },
+              onZoomStart: ({chart, event}) => {
+                // Allow wheel zoom (Ctrl+scroll) always; pinch only in fullscreen
+                if (event && event.type === "wheel") return true;
+                const wrap = chart.canvas.closest(".chart-wrap");
+                return wrap && wrap.classList.contains("chart-full");
+              },
             },
             pan: { enabled: false },
           },