Remove button mapping

web/style.css

@@ -153,13 +153,6 @@
   .col-mid   { display:grid; gap:12px; }
   .col-right { display:grid; gap:12px; position:sticky; top:80px; }
 
-  /*  XIAO pin diagram  */
-  .xiao-wrap { display:flex; flex-direction:column; align-items:center; padding:8px 0 14px; }
-  .pin-legend { display:flex; gap:20px; justify-content:center; font-family:var(--mono); font-size:9px; margin-top:10px; letter-spacing:0.08em; }
-  .pleg.left   { color:var(--ok); }
-  .pleg.right  { color:var(--accent2); }
-  .pleg.mid    { color:var(--accent); }
-  .xiao-divider { border:none; border-top:1px solid var(--border); margin:0 -20px 12px; }
 
   /*  Responsive  */
   @media (max-width:1100px) {
@@ -325,8 +318,7 @@
   .mod-btn input:disabled + span { opacity:0.35; cursor:not-allowed; }
 
   .restart-note { color:var(--warn); font-family:var(--mono); font-size:9px; }
-  .pin-select { background:var(--bg); color:var(--text); border:1px solid var(--border); font-family:var(--mono); font-size:11px; padding:3px 6px; cursor:pointer; min-width:80px; }
-  .pin-select:disabled { color:var(--dim); border-color:var(--dim); cursor:not-allowed; }
+
 
   .tap-flash { position:absolute; inset:0; pointer-events:none; opacity:0; transition:opacity 0.25s; }
   .tap-flash.left { background:radial-gradient(circle at center, var(--tap-left)  0%, transparent 70%); }