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

/* FONDO GENERAL */
body {
    background-color: #1f3c4b;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

/* ===== BARRA SUPERIOR ===== */
.top-bar {
    background-color: #102a43;
    color: #f4a261;
    text-align: center;
    padding: 25px;
}

.top-bar h1 {
    font-size: 40px;
}

.top-bar p {
    font-size: 15px;
    margin-top: 6px;
}

/* ===== CONTENEDOR ===== */
.contenedor {
    display: flex;
    min-height: calc(100vh - 140px);
}

/* ===== MENÚ LATERAL ===== */
.menu-lateral {
    background-color: #e1f5f2;
    width: 250px;
    padding: 20px;
}

.menu-lateral h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #102a43;
}

.menu-lateral ul {
    list-style: none;
}

.menu-lateral li {
    margin-bottom: 15px;
}

.menu-lateral a {
    text-decoration: none;
    color: #102a43;
    font-weight: bold;
    display: block;
    padding: 12px;
    border-radius: 10px;
    text-align: center;
    transition: 0.3s;
}

.menu-lateral a:hover {
    background-color: #e76f51;
    color: white;
}

/* ===== CONTENIDO ===== */
.contenido {
    flex: 1;
    padding: 30px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

/* ===== TARJETAS ===== */
.card {
    padding: 25px;
    border-radius: 18px;
    text-align: center;
    box-shadow: 0 6px 14px rgba(0,0,0,0.25);
}

/* TARJETAS FRÍAS */
#programacion,
#redes {
    background-color: #2f7f7a;
    color: white;
}

/* TARJETAS CÁLIDAS */
#estructura,
#tecnologia {
    background-color: #f4a261;
    color: #102a43;
}

.card h2 {
    margin-bottom: 15px;
}

/* LISTAS */
.card ul {
    list-style: none;
}

.card li {
    margin-bottom: 10px;
}

.card a {
    text-decoration: none;
    font-weight: bold;
    color: inherit;
}

.card a:hover {
    color: #e76f51;
}

/* ===== UNIDADES ===== */

.card h3{
    margin-top: 20px;
    margin-bottom: 10px;
    padding-bottom: 5px;
    border-bottom: 2px solid rgba(255,255,255,0.4);
    font-size: 18px;
}

/* Separación entre unidades */
.card article{
    margin-bottom: 15px;
}

/* Espacio entre actividades */
.card li{
    margin-bottom: 8px;
}

/* línea separadora entre unidades */
.card article + h3{
    margin-top: 25px;
}

/* ===== FOOTER ===== */
.footer {
    background-color: #102a43;
    color: #f4a261;
    text-align: center;
    padding: 15px;
    font-size: 14px;
}

/* ===== UNIDADES ===== */

.card h3{
    margin-top: 25px;
    margin-bottom: 12px;
    padding-bottom: 6px;
    border-bottom: 2px solid currentColor;
    font-size: 18px;
}

/* separación entre listas */
.card article{
    margin-bottom: 15px;
}

/* espacio entre actividades */
.card li{
    margin-bottom: 8px;
}