body{background:#111827;color:white;font-family:tahoma}.wrap{max-width:1200px;margin:30px auto;background:#1f2937;padding:30px;border-radius:15px}.grid{display:grid;grid-template-columns:2fr 1fr;gap:20px}.preview,.panel{background:#374151;padding:20px;border-radius:12px}.pcb{height:450px;background:#065f46;display:flex;align-items:center;justify-content:center}button{background:#10b981;color:white;border:0;padding:12px;border-radius:8px}select,input{padding:10px;margin:5px}