:root {
    --azul-profundo: #0F3C66;
    --azul-profesional: #1E73BE;
    --gris-claro: #F5F5F5;
    --blanco: #FFFFFF;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; color: #333; line-height: 1.6; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }

/* Header */
.main-header { padding: 20px 0; background: var(--blanco); box-shadow: 0 2px 5px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 100; }
.nav-wrapper { display: flex; justify-content: space-between; align-items: center; }
.desktop-nav a { text-decoration: none; color: var(--azul-profesional); margin-right: 20px; font-weight: 500; }

/* Hero */
.hero { background: var(--azul-profundo); color: var(--blanco); padding: 100px 0; }
.hero h1 { font-size: 3rem; margin-bottom: 20px; }
.hero p { font-size: 1.2rem; max-width: 700px; margin: 0 auto 30px; opacity: 0.9; }
.hero-btns { display: flex; gap: 15px; justify-content: center; }

/* Grid Responsive */
.grid-3 { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); 
    gap: 30px; 
    padding: 50px 0; 
}

.services { background: var(--gris-claro); padding: 80px 0; }
.cta-final { background: var(--azul-profesional); color: white; padding: 80px 0; }

/* Responsive Mobile */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero-btns { flex-direction: column; align-items: center; }
    .desktop-nav { display: none; } /* Aquí podrías añadir un menú hamburguesa */
}