diff --git a/index.html b/index.html
index 640b082..d3c815c 100644
--- a/index.html
+++ b/index.html
@@ -1252,8 +1252,15 @@ const GraphView = {
     area.innerHTML = '<div class="graph-container"></div>';
     const container = area.querySelector(".graph-container");
 
+    // Count tags per category
+    const categoryCounts = new Map();
+    tags.forEach(tag => {
+      const cat = Utils.getCategory(tag);
+      categoryCounts.set(cat, (categoryCounts.get(cat) || 0) + 1);
+    });
+
     this.renderSVG(container, nodes, links);
-    this.renderSidebar(container, nodes.length, links.length);
+    this.renderSidebar(container, nodes.length, links.length, categoryCounts);
     this.renderControls(container);
     this.renderLegend(container);
   },
@@ -1330,10 +1337,19 @@ const GraphView = {
       .on("end", (e, d) => { if (!e.active) sim.alphaTarget(0); d.fx = null; d.fy = null; });
   },
 
-  renderSidebar(container, nodeCount, edgeCount) {
+  renderSidebar(container, nodeCount, edgeCount, categoryCounts) {
     const { graphFilters, graphSettings } = State.get();
     const sidebar = document.createElement("div");
     sidebar.className = "graph-sidebar";
+
+    // Only show categories that have tags in current data
+    const categoryHTML = Object.entries(CONFIG.CATEGORIES)
+      .filter(([key]) => categoryCounts.has(key) && categoryCounts.get(key) > 0)
+      .map(([key, val]) => {
+        const count = categoryCounts.get(key) || 0;
+        return `<label class="graph-checkbox"><input type="checkbox" data-category="${key}" ${graphFilters.categories.has(key) ? "checked" : ""}><span class="color-dot" style="background:${val.color}"></span>${Utils.escapeHtml(val.name)} (${count})</label>`;
+      }).join("");
+
     sidebar.innerHTML = `
       <div class="graph-section">
         <div class="graph-section__title">Stats</div>
@@ -1342,7 +1358,7 @@ const GraphView = {
       </div>
       <div class="graph-section">
         <div class="graph-section__title">Categorías</div>
-        ${Object.entries(CONFIG.CATEGORIES).map(([key, val]) => `<label class="graph-checkbox"><input type="checkbox" data-category="${key}" ${graphFilters.categories.has(key) ? "checked" : ""}><span class="color-dot" style="background:${val.color}"></span>${Utils.escapeHtml(val.name)}</label>`).join("")}
+        ${categoryHTML || '<span class="empty">Sin categorías</span>'}
       </div>
       <div class="graph-section">
         <div class="graph-section__title">Relaciones</div>