.pdf-catalogues-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 32px;
    margin: 40px 0;
}

.pdf-card {
    background: #ffffff;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05), 0 10px 15px rgba(0, 0, 0, 0.03);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    border: 1px solid rgba(0,0,0,0.04);
    position: relative;
}

.pdf-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1), 0 20px 30px rgba(0, 0, 0, 0.05);
}

.pdf-card-thumb-wrapper {
    width: 100%;
    aspect-ratio: 1 / 1.414; /* Proporción A4 */
    overflow: hidden;
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    position: relative;
}

.pdf-card-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.pdf-card:hover .pdf-card-thumb {
    transform: scale(1.04);
}

.pdf-card-content {
    padding: 24px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.pdf-card-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    color: #1a1a1a;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.pdf-card-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: #1a1a1a;
    margin: 0 0 10px 0;
    line-height: 1.35;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.pdf-card-summary {
    font-size: 0.95rem;
    color: #555;
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}

.pdf-card-footer {
    border-top: 1px solid #f0f0f0;
    padding-top: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.pdf-card-read-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #0073aa;
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color 0.2s;
}

.pdf-card:hover .pdf-card-read-btn {
    color: #005c87;
}