:root {
    --azul: #3498db;
    --verde: #2ecc71;
    --gris-oscuro: #2c3e50;
    --gris: #7f8c8d;
    --gris-claro: #ecf0f1;
    --degradado-azul-verde: linear-gradient(135deg, var(--azul), var(--verde));
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: #f8f9fa;
    color: var(--gris-oscuro);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* HEADER */
header {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    color: var(--azul);
}

nav ul {
    display: flex;
    gap: 25px;
    list-style: none;
}

nav a {
    text-decoration: none;
    color: var(--gris-oscuro);
    font-weight: 500;
}

nav a.active,
nav a:hover {
    color: var(--azul);
}

/* FOOTER */
footer {
    background: var(--gris-oscuro);
    color: white;
    padding: 40px 0;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.footer-column h3 {
    margin-bottom: 15px;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column a {
    color: white;
    text-decoration: none;
}

.footer-column a:hover {
    text-decoration: underline;
}

.social-icons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.social-icons a {
    color: white;
    font-size: 1.2rem;
}

/* =========================================
   MEDIA QUERIES GLOBALES (Responsive)
========================================= */
@media (max-width: 768px) {
    header {
        position: relative; /* ¡La magia! Hace que el menú no te persiga al bajar */
    }

    .header-container {
        flex-direction: column;
        height: auto;
        padding: 12px 0;
        gap: 10px;
    }

    .logo {
        justify-content: center;
        font-size: 1.4rem; /* El tamaño de oro: legible pero no invasivo */
        text-align: center;
    }

    nav ul {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    nav a {
        font-size: 1rem; /* Tamaño normal de lectura */
        padding: 6px 10px;
        display: flex;
        align-items: center;
        gap: 5px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.2rem; 
    }
    
    nav ul {
        gap: 10px;
    }

    nav a {
        font-size: 0.95rem;
        padding: 4px 8px;
    }
}