:root {
    --azul-uchile: #0033a0;
    /* Color corporativo aproximado */
    --gris-fondo: #f4f7f6;
    --blanco: #ffffff;
}

.container {
    max-width: 1100px;
    margin: 50px auto;
    padding: 20px;
    font-family: 'Arial', sans-serif;
    text-align: center;
}

.section-title {
    color: #333;
    font-size: 2.5rem;
    margin-bottom: 40px;
}

.cards-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    justify-content: center;
}

.card {
    background: var(--blanco);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 300px;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.card:hover {
    transform: translateY(-10px);
}

.pdf-icon {
    width: 60px;
    margin-bottom: 20px;
}

.card h3 {
    font-size: 1.2rem;
    color: #222;
    margin-bottom: 15px;
    line-height: 1.4;
}

.card p {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 25px;
    flex-grow: 1;
}

.btn-download {
    background-color: var(--azul-uchile);
    color: white;
    text-decoration: none;
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: bold;
    display: inline-block;
    transition: background 0.3s;
}

.btn-download:hover {
    background-color: #002575;
}