.pdf-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: 1fr;
}

.pdf-grid.double {
    grid-template-columns: repeat(2, 1fr);
}

.pdf-grid.multi {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

@media (max-width: 768px) {
    .pdf-grid.double,
    .pdf-grid.multi {
        grid-template-columns: 1fr;
    }
}

.pdf-grid canvas {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: 0.3s ease;
    display: block;
}

.pdf-grid canvas:hover {
    transform: scale(1.03);
}

/* Modal Overlay */
.pdf-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.8);
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.pdf-modal canvas {
    max-width: 90%;
    max-height: 90%;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.pdf-modal.active {
    display: flex;
}