body{margin:0;font-family:system-ui;background:#f4f6f8}
.layout{display:flex;height:100vh}
.sidebar{width:200px;background:#fff;padding:20px}
.sidebar button{display:block;width:100%;margin-bottom:8px}
.sidebar button.active{background:#2563eb;color:#fff}
.main{flex:1;padding:20px}
.pos{display:flex;gap:20px}
.products{flex:2;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.card{background:#fff;padding:12px;border-radius:10px}
.cart{flex:1;background:#fff;padding:12px;border-radius:10px}
.row{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.empty{color:#888}