*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background:#f8f9fa;padding:20px}.container{max-width:1200px;margin:0 auto}h1{text-align:center;color:#2c3e50;margin-bottom:20px}.card{background:white;padding:20px;margin-bottom:20px;border-radius:8px;box-shadow:0 2px 5px rgba(0,0,0,0.1)}.card h2{color:#2c3e50;margin-bottom:15px;border-bottom:1px solid #eee;padding-bottom:10px}input,select,button{width:100%;padding:10px;margin:5px 0;border:1px solid #ddd;border-radius:5px}button{background:#28a745;color:white;border:none;cursor:pointer;font-size:16px}button:hover{background:#218838}.btn-danger{background:#dc3545}.btn-danger:hover{background:#c82333}.btn-warning{background:#ffc107;color:#212529}.btn-warning:hover{background:#e0a800}.producto-item{border:1px solid #dee2e6;padding:15px;margin:10px 0;border-radius:5px}.venta-item{background:#e9ecef;padding:10px;margin:5px 0;border-radius:5px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}@media (max-width:768px){.grid{grid-template-columns:1fr}}.total-venta{background:#d4edda;padding:15px;border-radius:5px;font-size:1.2em;font-weight:bold;text-align:center}