fix: horizontal toolbar layout + fix component button placement

Redesign toolbar sections to use horizontal button rows instead of
vertical stacking. Fix component placement by attaching click handlers
directly to dynamically created buttons and passing correct gate object
shape to getComponentWidth/Height.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

css/style.css

@@ -78,7 +78,21 @@ body {
 .gate-btn.output-btn { border-color: #ff8833; }
 .gate-btn.output-btn:hover { border-color: #ffaa55; }
 
-.separator { width: 1px; height: 24px; background: #2a2a3a; margin: 0 6px; }
+.separator { width: 1px; height: 32px; background: #2a2a3a; margin: 0 6px; }
+
+.create-component-btn {
+    padding: 4px 10px;
+    background: #1a1a2e;
+    border: 1px solid #9900ff;
+    border-radius: 6px;
+    color: #9900ff;
+    cursor: pointer;
+    font-size: 11px;
+    font-weight: 600;
+    transition: all 0.15s;
+    user-select: none;
+}
+.create-component-btn:hover { background: #252540; border-color: #cc66ff; color: #cc66ff; }
 .toolbar-right { margin-left: auto; display: flex; gap: 6px; align-items: center; }
 
 .action-btn {
@@ -102,49 +116,54 @@ body {
     display: flex;
     flex-direction: column;
     align-items: flex-start;
-    gap: 1px;
-    height: 56px;
-    justify-content: flex-start;
+    gap: 2px;
+    padding: 4px 0;
 }
 
 .section-label {
     font-size: 8px;
-    color: #666;
+    color: #555;
     font-weight: 600;
     text-transform: uppercase;
     letter-spacing: 0.5px;
-    padding: 1px 6px;
-    height: 10px;
-    line-height: 10px;
+    padding: 0 2px;
+    line-height: 1;
+}
+
+.section-buttons {
+    display: flex;
+    gap: 3px;
+    align-items: center;
+    flex-wrap: nowrap;
 }
 
 .toolbar-section .gate-btn {
-    padding: 3px 8px;
-    font-size: 10px;
-    height: 20px;
-    display: flex;
-    align-items: center;
+    padding: 4px 10px;
+    font-size: 11px;
 }
 
 .toolbar-section #saved-components {
     display: flex;
-    gap: 2px;
+    gap: 3px;
+    align-items: center;
 }
 
 .toolbar-section .component-btn {
-    padding: 4px 8px;
-    font-size: 10px;
+    padding: 4px 10px;
+    font-size: 11px;
     background: #1a1a2e;
     border: 1px solid #2a2a3a;
-    border-radius: 4px;
+    border-radius: 6px;
     color: #9900ff;
     cursor: pointer;
+    font-weight: 600;
     transition: all 0.15s;
 }
 
 .toolbar-section .component-btn:hover {
     border-color: #9900ff;
     color: #cc66ff;
+    background: #252540;
 }
 
 /* ==================== Canvas ==================== */

index.html

@@ -13,16 +13,19 @@
         <!-- I/O Section -->
         <div class="toolbar-section">
             <div class="section-label">I/O</div>
+            <div class="section-buttons">
                 <button class="gate-btn input-btn" data-gate="INPUT">INPUT</button>
                 <button class="gate-btn clock-btn" data-gate="CLOCK">CLOCK</button>
                 <button class="gate-btn output-btn" data-gate="OUTPUT">OUTPUT</button>
             </div>
+        </div>
 
         <div class="separator"></div>
 
         <!-- Gates Section -->
         <div class="toolbar-section">
             <div class="section-label">Gates</div>
+            <div class="section-buttons">
                 <button class="gate-btn" data-gate="AND">AND</button>
                 <button class="gate-btn" data-gate="OR">OR</button>
                 <button class="gate-btn" data-gate="NOT">NOT</button>
@@ -30,15 +33,18 @@
                 <button class="gate-btn" data-gate="NOR">NOR</button>
                 <button class="gate-btn" data-gate="XOR">XOR</button>
             </div>
+        </div>
 
         <div class="separator"></div>
 
         <!-- Components Section -->
         <div class="toolbar-section" id="components-section">
             <div class="section-label">Components</div>
-            <button class="gate-btn create-component-btn" id="create-component-btn" title="Create custom component">✚ Create</button>
+            <div class="section-buttons">
+                <button class="create-component-btn" id="create-component-btn" title="Create custom component">✚ Create</button>
                 <div id="saved-components"></div>
             </div>
+        </div>
 
         <div class="separator"></div>
 

js/components.js

@@ -283,6 +283,10 @@ export function updateComponentButtons() {
         btn.dataset.componentId = comp.id;
         btn.textContent = comp.name;
         btn.title = `${comp.inputCount} input(s), ${comp.outputCount} output(s)`;
+        btn.addEventListener('click', (e) => {
+            e.stopPropagation();
+            state.placingGate = `COMPONENT:${comp.id}`;
+        });
         container.appendChild(btn);
     });
 }

js/events.js

@@ -71,8 +71,9 @@ export function initEvents() {
                 const componentId = state.placingGate.substring(10);
                 const component = state.customComponents?.[componentId];
                 if (component) {
-                    w = getComponentWidth({ component });
-                    h = getComponentHeight({ component });
+                    const fakeGate = { type: state.placingGate, component };
+                    w = getComponentWidth(fakeGate);
+                    h = getComponentHeight(fakeGate);
                 }
             }
 
@@ -348,14 +349,6 @@ export function initEvents() {
         }
     });
 
-    // Event delegation for saved component buttons
-    document.addEventListener('click', e => {
-        if (e.target.classList.contains('component-btn')) {
-            const componentId = e.target.dataset.componentId;
-            state.placingGate = `COMPONENT:${componentId}`;
-        }
-    });
-
-    // Update component buttons initially and when customComponents changes
+    // Update component buttons initially
     updateComponentButtons();
 }