.resource-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    cursor: pointer;
    overflow: hidden;
}

.resource-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--tha-navy);
}

.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--tha-navy) 0%, var(--tha-red) 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: left;
}

.resource-card:hover::before {
    transform: scaleX(1);
}

.card-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
    position: relative;
}

.file-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--white);
    font-size: 0.8rem;
    flex-shrink: 0;
}

.file-icon.pdf {
    background: #E53E3E;
}

.file-icon.pptx {
    background: #D69E2E;
}

.file-icon.docx {
    background: #3182CE;
}

.file-icon.xlsx,
.file-icon.csv {
    background: #38A169;
}

.file-icon.mp4 {
    background: #805AD5;
}

.file-icon.png,
.file-icon.jpg,
.file-icon.jpeg {
    background: #DD6B20;
}

.file-icon.default {
    background: var(--tha-gray);
}

.card-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.badge.new {
    background: var(--tha-red);
    color: var(--white);
    animation: pulse 2s infinite;
}

.badge.category {
    background: var(--tha-light-gray);
    color: var(--text-light);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.card-content {
    flex: 1;
    margin-right: 2.5rem; /* Give space for checkbox */
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    line-height: 1.3;
    word-break: break-word;
}

.card-description {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.4;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-metadata {
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-light);
}

.file-size {
    font-weight: 500;
}


.card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition);
}

.resource-card:hover .card-actions {
    opacity: 1;
    transform: translateY(0);
}

.action-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.action-btn.primary {
    background: var(--tha-navy);
    color: var(--white);
}

.action-btn.primary:hover {
    background: #001a4a;
}

.action-btn.secondary {
    background: var(--white);
    color: var(--tha-navy);
    border: 1px solid var(--tha-navy);
}

.action-btn.secondary:hover {
    background: var(--tha-light-gray);
}

.external-icon {
    font-size: 0.8em;
    margin-left: 0.25rem;
    opacity: 0.7;
}

.skeleton-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
}

.skeleton-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
    transform: translateX(-100%);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    100% {
        transform: translateX(100%);
    }
}

.skeleton-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.skeleton-icon {
    width: 40px;
    height: 40px;
    background: var(--border-color);
    border-radius: 8px;
    margin-right: 1rem;
}

.skeleton-title {
    height: 20px;
    background: var(--border-color);
    border-radius: 4px;
    flex: 1;
}

.skeleton-description {
    height: 14px;
    background: var(--border-color);
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.skeleton-description:last-of-type {
    width: 70%;
}

@media (max-width: 768px) {
    .resource-card {
        padding: 1rem;
    }
    
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .card-content {
        margin-right: 1.5rem; /* Less margin on mobile */
    }
    
    .file-icon {
        margin-right: 0;
        margin-bottom: 0.5rem;
    }
    
    .card-badges {
        align-items: flex-start;
        flex-direction: row;
        gap: 0.5rem;
    }
    
    .card-actions {
        opacity: 1;
        transform: none;
        flex-direction: column;
    }
    
    .card-metadata {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}