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

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
}
html, body {
    height: 100%;
    margin: 0;
}
.contenedor {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}
/* ── NAVBAR ── */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #2c3e50;
    padding: 0 40px;
    height: 60px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-logo a {
    color: white;
    text-decoration: none;
    font-size: 1.4rem;
    font-weight: bold;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: #ccc;
    text-decoration: none;
    font-size: 1rem;
    padding: 5px 10px;
    border-radius: 4px;
    transition: all 0.3s;
}

.nav-links a:hover,
.nav-links a.activo {
    color: white;
    background-color: #3498db;
}

/* ── CONTENIDO ── */
.contenido {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

/* ── FOOTER ── */
.footer {
    background: #222;
    color: #fff;
    text-align: center;
    padding: 10px;
}