.pdf-list-wrapper {
    margin: 20px 0;
}

.pdf-list-title {
    margin-bottom: 30px;
    font-size: 28px;
    font-weight: 600;
    text-align: center;
}

.pdf-grid {
    display: grid;
    gap: 2rem;
    margin: 2rem 0;
}

.pdf-grid.columns-1 {
    grid-template-columns: 1fr;
}

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

.pdf-grid.columns-3 {
    grid-template-columns: repeat(3, 1fr);
}

.pdf-grid.columns-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* PDF Card */
.pdf-item {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.pdf-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* Thumbnail */
.pdf-thumbnail {
    position: relative;
    overflow: hidden;
}

.pdf-thumbnail img {
    width: 100%;
    height: 300px !important;
    display: block;
    object-fit: cover;
}

/* Content */
.pdf-content {
    padding: 20px;
}

.pdf-title {
    padding: 1rem;
    margin: 0;
    font-size: 3rem;
    color: #333;
    text-align: left;
}

.pdf-title a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s ease;
}

.pdf-title a:hover {
    color: #0073aa;
}

.pdf-meta {
    margin-bottom: 15px;
    color: #666;
    font-size: 0.9rem;
}

.pdf-size {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.pdf-size i {
    color: #e74c3c;
}

.pdf-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.view-pdf-button {
    display: block;
    text-align: center;
    padding: 0.8rem 1rem;
    background: #007bff;
    color: #fff;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.view-pdf-button:hover {
    background: #0056b3;
    color: #fff;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .pdf-grid.columns-4 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .pdf-grid.columns-3,
    .pdf-grid.columns-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .pdf-grid.columns-2,
    .pdf-grid.columns-3,
    .pdf-grid.columns-4 {
        grid-template-columns: 1fr;
    }
    
    .pdf-grid {
        gap: 1rem;
    }
}

.pdf-list-item {
    padding: 15px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.pdf-list-item-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.pdf-list-item h3 {
    margin: 0;
    font-size: 18px;
}

.pdf-list-item h3 a {
    text-decoration: none;
    transition: color 0.3s ease;
}

.pdf-description {
    font-size: 14px;
    color: #666;
    line-height: 1.5;
}

.pdf-size, .pdf-date {
    display: flex;
    align-items: center;
}

.pdf-size:before {
    content: "📄";
    margin-right: 5px;
}