body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(rgba(10,15,28,0.85), rgba(10,15,28,0.95)), 
                url('../img/fondo.jpg') center/cover fixed;
    color: #e2e8f0;
    min-height: 100vh;
}