body{font-family:Arial,sans-serif;margin:0}.shell{display:grid;grid-template-columns:260px 1fr;min-height:100vh}aside{background:#f2f2f2;padding:16px;display:flex;flex-direction:column;gap:8px}nav{display:flex;flex-direction:column;gap:6px}main{padding:16px}button{margin-right:8px;margin-top:8px}pre{background:#111;color:#e7e7e7;padding:12px;overflow-x:auto}input,select{margin-right:8px;margin-top:8px}textarea{width:100%;max-width:820px;margin-top:8px;font-family:monospace}table{border-collapse:collapse;margin-top:12px;min-width:420px}th,td{border:1px solid #ddd;padding:6px 8px;text-align:left}