:root {
    --azul-oscuro: #002868;
    --amarillo: #FEEB1A;
    --blanco: #ffffff;
    --gris-claro: #f4f4f4;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

html {
    scroll-behavior: smooth;
}

/* Header & Nav */
.top-bar {
    background-color: var(--azul-oscuro);
    color: var(--blanco);
    padding: 5px 10%;
    font-size: 0.8rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--azul-oscuro);
    padding: 15px 10%;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    color: white;
    font-size: 1.8rem;
    font-weight: bold;
    letter-spacing: 2px;
}

.logo span {
    color: var(--amarillo);
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li a {
    color: white;
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    transition: 0.3s;
}

.nav-links li a:hover {
    color: var(--amarillo);
}

/* Hero Section */
.hero {
    height: 80vh;
    background: linear-gradient(rgba(0,40,104,0.7), rgba(0,40,104,0.7)), 
                url('https://images.unsplash.com/photo-1581092160562-40aa08e78837?auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    padding: 0 10%;
    color: white;
}

.hero-content h1 {
    font-size: 3.5rem;
    max-width: 600px;
}

.hero-content h1 span {
    color: var(--amarillo);
}

.btn-main {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 30px;
    background-color: var(--amarillo);
    color: var(--azul-oscuro);
    text-decoration: none;
    font-weight: bold;
    border-radius: 25px;
    transition: 0.3s;
}

.btn-main:hover {
    background-color: white;
    transform: translateY(-3px);
}

/* Sections */
.info-section {
    padding: 80px 10%;
    text-align: center;
    background: var(--blanco);
}

.container hr {
    width: 60px;
    height: 4px;
    background: var(--amarillo);
    border: none;
    margin: 20px auto;
}

.services {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 40px 10%;
    background: var(--gris-claro);
}

.card {
    background: white;
    padding: 30px;
    border-left: 5px solid var(--azul-oscuro);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: 0.3s;
}

.card:hover {
    border-left: 5px solid var(--amarillo);
}

footer {
    background: var(--azul-oscuro);
    color: white;
    text-align: center;
    padding: 20px;
}

/* Responsive */
.burger { display: none; cursor: pointer; }
.burger div { width: 25px; height: 3px; background: white; margin: 5px; }

@media (max-width: 768px) {
    .nav-links { display: none; }
    .burger { display: block; }
    .hero-content h1 { font-size: 2.5rem; }
}

// Cambio de color del nav al hacer scroll
window.addEventListener('scroll', function() {
    const nav = document.querySelector('nav');
    if (window.scrollY > 50) {
        nav.style.boxShadow = "0 2px 10px rgba(0,0,0,0.3)";
    } else {
        nav.style.boxShadow = "none";
    }
});

// Mensaje de bienvenida simple en consola
console.log("Sitio Corporativo GUCORP cargado correctamente.");