/* Whitepapers Page Styles */

.whitepapers-intro {
    background: var(--background);
    color: var(--color);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2.5rem;
    border: 1px solid var(--border-color, #e0e0e0);
}

.whitepapers-intro p {
    font-size: 1.05rem;
    line-height: 1.7;
    margin: 0;
}

.filter-tabs {
    display: flex;
    gap: 0.8rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1rem;
    background: var(--background);
    border: 2px solid var(--border-color, #e0e0e0);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
    color: var(--color);
    font-size: 0.9rem;
}

.filter-btn:hover {
    border-color: var(--color);
    color: var(--color);
}

.filter-btn.active {
    background: var(--color);
    color: var(--background);
    border-color: var(--color);
}

.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.paper-card {
    background: var(--background);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color, #e0e0e0);
    transition: all 0.3s;
}

.paper-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.year-badge {
    display: inline-block;
    background: var(--background);
    color: var(--color);
    padding: 0.25rem 0.7rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    border: 1px solid var(--border-color, #e0e0e0);
}

.paper-title {
    font-size: 1.25rem;
    color: var(--color);
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.3;
}

.paper-description {
    color: var(--color-secondary, #666);
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
    line-height: 1.6;
}

.tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-bottom: 1.2rem;
}

.tag {
    background: var(--tag-background, #f0f0f0);
    color: var(--color-secondary, #555);
    padding: 0.25rem 0.7rem;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 500;
}

.tag.android { 
    background: #e8f5e9; 
    color: #2e7d32; 
}

.tag.banking { 
    background: #e0e2ff; 
    color: #8e7aff; 
}

.tag.trojan { 
    background: #fce4ec; 
    color: #c2185b; 
}

.tag.frauds { 
    background: #fff3e0; 
    color: #e65100; 
}

.tag.windows { 
    background: #e3f2fd;
    color: #0078d4;        
}

/* Dark mode adjustments */
@media (prefers-color-scheme: dark) {
    .tag.android { 
        background: rgba(46, 125, 50, 0.2); 
        color: #81c784; 
    }
    
    .tag.banking { 
        background: rgba(193, 220, 251, 0.2); 
        color: #8e7aff;  
    }
    
    .tag.trojan { 
        background: rgba(194, 24, 91, 0.2); 
        color: #f48fb1; 
    }
    
    .tag.frauds { 
        background: rgba(230, 81, 0, 0.2); 
        color: #ffb74d; 
    }

    .tag.windows { 
        background: rgba(0, 120, 212, 0.2);   
        color: #42a5f5;
    }
}

.links {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.link-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.5rem 0.9rem;
    background: var(--link-background, #f8f9fa);
    color: var(--color);
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s;
    border: 1px solid var(--border-color, #e0e0e0);
}

.link-btn:hover {
    background: var(--color);
    color: var(--background);
    border-color: var(--color);
    text-decoration: none;
}

.link-btn svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

@media (max-width: 768px) {
    .papers-grid {
        grid-template-columns: 1fr;
    }

    .whitepapers-intro {
        padding: 1.5rem;
    }
}