body {
    background-color: #F5F5F5;
    color: #333333;
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
    background-image: url('img/iepianal.png'); 
    background-size: cover;       
    background-repeat: no-repeat; 
    background-attachment: fixed;
}

* { box-sizing: border-box; }

header.encabezado {
    display: flex; 
    flex-direction: row; 
    justify-content: space-between; 
    align-items: center; 
    max-width: 1200px;
    margin: 20px auto; 
    padding: 20px 40px; 
    background-color: #0D3B66; 
    color: #FFFFFF; 
    border: 2px solid #1E90FF; 
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    text-align: left;
}

.info-header h1 { font-size: 28px; color: #FFFFFF; margin: 0; }
.info-header h2 { font-size: 16px; color: #E0E0E0; margin: 5px 0 0 0; font-weight: normal; }

/* Botón moderno para regresar */
.btn-regresar {
    display: inline-block;
    padding: 10px 20px;
    background-color: #1E90FF;
    color: white;
    text-decoration: none;
    font-weight: bold;
    border-radius: 10px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.btn-regresar:hover {
    background-color: white;
    color: #0D3B66;
    transform: scale(1.05);
}

main { max-width: 1200px; margin: 0 auto; padding: 20px; }
section.bloque-articulos { display: flex; flex-wrap: wrap; justify-content: center; gap: 25px; padding: 20px 0; }

article {
    flex: 1 1 450px; 
    max-width: 550px;
    padding: 25px;
    border-radius: 20px;
    background-color: rgba(116, 169, 216, 0.95); 
    box-shadow: 0 6px 18px rgba(0,0,0,0.08);
    text-align: left;
}

article h2 {
    font-size: 22px;
    color: #0D3B66; 
    margin: 0 0 15px 0;
    border-bottom: 2px solid #0D3B66;
    padding-bottom: 5px;
}

.contenedor-recuadros { display: flex; flex-wrap: wrap; gap: 12px; }

/* Convertimos las etiquetas 'a' en los botones estilizados */
.recuadro {
    flex: 1 1 100px;
    padding: 15px 10px;
    border: 2px solid #0D3B66;
    border-radius: 12px;
    text-align: center;
    font-weight: bold;
    font-size: 14px;
    text-decoration: none; /* Le quita la línea fea de enlace abajo */
    background-color: #FFFFFF;
    color: #0D3B66;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.recuadro:hover {
    background-color: #0D3B66;
    color: #FFFFFF;
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(13, 59, 102, 0.3);
}

/* Caja de contenido de los talleres */
.seccion-contenido {
    background-color: rgba(255, 255, 255, 0.96);
    padding: 35px;
    border-radius: 20px;
    border-left: 6px solid #0D3B66;
    margin: 20px auto;
    text-align: left;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.seccion-contenido h2 { color: #0D3B66; font-size: 26px; margin-bottom: 25px; }
.seccion-contenido h3 { color: #1E90FF; font-size: 18px; margin-top: 25px; margin-bottom: 10px; }
.seccion-contenido p { line-height: 1.6; color: #444; font-size: 16px; }
.seccion-contenido ul { padding-left: 20px; }
.seccion-contenido li { margin-bottom: 8px; line-height: 1.6; color: #444; }

code { background-color: #F0F4F8; color: #D63384; padding: 2px 6px; border-radius: 4px; font-family: monospace; }
pre { background-color: #212529; color: #F8F9FA; padding: 15px; border-radius: 8px; overflow-x: auto; border-left: 4px solid #1E90FF; }

footer {
    display: flex; justify-content: space-around; align-items: center; 
    max-width: 1200px; margin: 30px auto; padding: 20px; 
    background-color: #1B263B; color: #FFFFFF; border-radius: 20px;
}
footer div h3 { margin: 0; font-size: 18px; }
footer div p { margin: 5px 0 0 0; font-size: 14px; color: #B0B0B0; }
/* --- 1. Estilos Base (Celulares pequeños: < 480px) --- */
.container {
    display: flex;
    flex-direction: column; /* Todo apilado */
    gap: 15px;
    padding: 10px;
    width: 100%;
}

.card {
    width: 100%;
    padding: 20px;
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* --- 2. Tablets (Pantallas > 768px) --- */
@media (min-width: 768px) {
    .container {
        flex-direction: row;
        flex-wrap: wrap;
    }
    .card {
        width: calc(50% - 15px); /* 2 columnas */
    }
}

/* --- 3. Computadores (Pantallas > 1024px) --- */
@media (min-width: 1024px) {
    .card {
        width: calc(33.333% - 15px); /* 3 columnas */
    }
}

/* --- 4. Pantallas muy grandes / Ultra-Wide (> 1440px) --- */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px; /* Centra el contenido en pantallas gigantes */
        margin: 0 auto;
    }
    .card {
        width: calc(25% - 15px); /* 4 columnas para mejor aprovechamiento */
    }
}