diff --git a/steps/src/dataExplorer.js b/steps/src/dataExplorer.js
index 23bf8d9..c31763e 100644
--- a/steps/src/dataExplorer.js
+++ b/steps/src/dataExplorer.js
@@ -1,6 +1,7 @@
 // In src/dataExplorer.js
 
 import { appState } from './state.js';
+import { throttle } from './utils.js';
 import { 
     canvasContainer, 
     explorerBtn 
@@ -74,12 +75,12 @@ function hideExplorer() {
 function switchTab(targetTab) {
     Object.values(tabs).forEach(tab => {
         tab.panel.classList.add('hidden');
-        tab.btn.classList.remove('border-blue-500');
-        tab.btn.classList.add('text-gray-500', 'dark:text-gray-400');
+        tab.btn.classList.remove('border-blue-500', 'text-gray-900', 'dark:text-white');
+        tab.btn.classList.add('text-gray-500', 'dark:text-gray-400', 'border-transparent');
     });
 
     tabs[targetTab].panel.classList.remove('hidden');
-    tabs[targetTab].btn.classList.add('border-blue-500');
+    tabs[targetTab].btn.classList.add('border-blue-500', 'text-gray-900', 'dark:text-white');
     tabs[targetTab].btn.classList.remove('text-gray-500', 'dark:text-gray-400');
 
     footer.classList.toggle('hidden', targetTab !== 'grid');
@@ -126,6 +127,32 @@ function displayInGrid(data, title) {
     switchTab('grid');
 }
 
+// --- START: New Robust Update Logic ---
+let throttleTimer = null;
+let debounceTimer = null;
+
+/**
+ * A custom throttled and debounced function for updating the explorer.
+ * - It throttles calls to prevent updates more than once every 400ms.
+ * - It debounces calls to ensure a final, guaranteed update happens 500ms
+ *   after the last call, catching the "end" of a seeking action.
+ */
+export function throttledUpdateExplorer() {
+    // Clear any pending final update, as a new call has come in.
+    clearTimeout(debounceTimer);
+
+    // If we are not currently in a "cool-down" period from a throttled call...
+    if (!throttleTimer) {
+        updateExplorer(); // ...execute the update immediately.
+        // Then, set a cool-down timer to prevent another immediate execution.
+        throttleTimer = setTimeout(() => { throttleTimer = null; }, 400); // 400ms throttle
+    }
+
+    // Schedule a final, debounced update for after the interactions stop.
+    debounceTimer = setTimeout(() => { updateExplorer(); }, 500); // 500ms debounce
+}
+// --- END: New Robust Update Logic ---
+
 // --- Initialization Function (The file's only export) ---
 
 export function initializeDataExplorer() {
diff --git a/steps/src/dom.js b/steps/src/dom.js
index efebf14..8901f53 100644
--- a/steps/src/dom.js
+++ b/steps/src/dom.js
@@ -1,5 +1,6 @@
 import { appState } from "./state.js";
 import { formatUTCTime } from "./utils.js";
+import { throttledUpdateExplorer } from "./dataExplorer.js";
 // Also import VIDEO_FPS from constants
 import { VIDEO_FPS } from "./constants.js";
 
@@ -156,6 +157,9 @@ export function updateFrame(frame, forceVideoSeek) {
   // --- End of fix ---
 
   if (appState.p5_instance) appState.p5_instance.redraw(); // Redraw radar sketch
+  // --- NEW: Centralized Explorer Update ---
+  throttledUpdateExplorer();
+  // --- END: Centralized Explorer Update ---
   if (appState.speedGraphInstance && !appState.isPlaying)
     // Redraw speed graph if not playing.
   appState.speedGraphInstance.redraw();
diff --git a/steps/src/main.js b/steps/src/main.js
index 052cfd2..1c39907 100644
--- a/steps/src/main.js
+++ b/steps/src/main.js
@@ -18,7 +18,7 @@
 
 import { zoomSketch } from "./p5/zoomSketch.js";
 //import { showExplorer, hideExplorer, displayInGrid } from "./dataExplorer.js";
-import { initializeDataExplorer } from "./dataExplorer.js"; // <-- ADD THIS
+import { initializeDataExplorer, throttledUpdateExplorer } from "./dataExplorer.js"; // <-- ADD THIS
 import {
   showModal,
   hideModal,
@@ -742,7 +742,6 @@ timelineSlider.addEventListener("input", (event) => {
     updateFrame(frame, true);
     appState.mediaTimeStart = videoPlayer.currentTime;
     appState.masterClockStart = now;
-    timelineSlider.lastInputTime = now;
   }
 
   // --- 2. Final, Precise Sync (Debounced for reliability) ---
@@ -802,6 +801,7 @@ timelineSlider.addEventListener("wheel", (event) => {
     updatePersistentOverlays(videoPlayer.currentTime);
     updateDebugOverlay(videoPlayer.currentTime);
   }, 300); // Wait 300ms after the last scroll event
+  throttledUpdateExplorer();
 });
 
 // In src/main.js, add this new block of event listeners