Improve layout

src/main/resources/static/css/styles.css

@@ -399,10 +399,12 @@ body {
     background: #0b1220;
 }
 
+.controls-full {
+    width: 100%;
+}
+
 .assets-panel {
-    margin-top: 16px;
     background: #0b1220;
-    border-top: 1px solid #1f2937;
     padding: 18px;
 }
 

src/main/resources/templates/admin.html

@@ -24,14 +24,14 @@
         <canvas id="admin-canvas"></canvas>
     </section>
     <section class="controls assets-panel">
-        <div>
+        <div class="controls-full panel">
             <h3>Overlay assets</h3>
             <p>Upload overlay visuals and adjust them inline.</p>
             <input id="asset-file" type="file" accept="image/*,video/*" />
             <button onclick="uploadAsset()">Upload</button>
             <ul id="asset-list" class="asset-list"></ul>
             <div id="asset-controls-placeholder" class="hidden"></div>
-            <div id="asset-controls" class="panel hidden asset-settings">
+            <div id="asset-controls" class="hidden asset-settings">
                 <div class="panel-section">
                     <div class="section-header">
                         <h5>Layout & order</h5>