/* Portfolio Section Styles */

.portfolio-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.portfolio-filter-btn {
    padding: 0.75rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.portfolio-filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 230, 160, 0.1), transparent);
    transition: left 0.5s ease;
}

.portfolio-filter-btn:hover::before {
    left: 100%;
}

.portfolio-filter-btn:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.portfolio-filter-btn.active {
    background: var(--primary-color);
    color: var(--dark-bg);
    border-color: var(--primary-color);
    font-weight: 600;
}

.portfolio-filter-btn.active::before {
    display: none;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.portfolio-item {
    background: var(--card-bg);
    border-radius: var(--border-radius-small);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    group: hover;
}

.portfolio-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-hover);
}

.portfolio-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s ease;
    display: block;
}

.portfolio-content {
    padding: 1.5rem;
}

.portfolio-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.portfolio-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.portfolio-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.portfolio-tag {
    background: rgba(0, 230, 160, 0.1);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 1px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(0, 230, 160, 0.2);
    transition: all 0.2s ease;
}

.portfolio-tag:hover {
    background: rgba(0, 230, 160, 0.15);
}

/* Portfolio Item Animations */
.portfolio-item {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.5s ease;
}

.portfolio-item.hidden {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
}

.portfolio-item.fade-in {
    animation: fadeInUp 0.5s ease forwards;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .portfolio-filters {
        gap: 0.5rem;
        margin-bottom: 2rem;
    }
    
    .portfolio-filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .portfolio-item {
        margin: 0 0.5rem;
    }
    
    .portfolio-content {
        padding: 1.25rem;
    }
    
    .portfolio-image {
        height: 200px;
    }
}

@media (max-width: 480px) {
    .portfolio-filters {
        flex-direction: column;
        align-items: center;
    }
    
    .portfolio-filter-btn {
        width: 200px;
        text-align: center;
    }
    
    .portfolio-item {
        margin: 0;
    }
}

/* Loading State */
.portfolio-grid.loading .portfolio-item {
    opacity: 0.6;
    pointer-events: none;
}

/* Empty State */
.portfolio-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.portfolio-empty h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.portfolio-empty p {
    font-size: 1rem;
    line-height: 1.6;
}

/* Focus States for Accessibility */
.portfolio-filter-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.portfolio-item:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .portfolio-item {
        border-width: 2px;
    }
    
    .portfolio-filter-btn {
        border-width: 2px;
    }
}