/* Portfolio Styles */

/* Filter Buttons */
.filter-buttons {
    display: flex;
    gap: 1.5rem;
    padding: 1rem 0;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0;
}

.filter-btn {
    padding: 0.25rem 0.5rem;
    border: none;
    background: transparent;
    color: var(--light-text);
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    transition: color 0.2s ease;
}

.filter-separator {
    color: #ccc;
    font-size: 0.8rem;
    margin: 0 0.25rem;
}

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

.filter-btn.active {
    color: var(--accent-color);
    font-weight: 500;
}

/* Grid */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    margin-bottom: 4rem;
}

.project-card {
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-radius: 0;
    overflow: hidden;
    background: white;
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.project-card:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 24px rgba(0,0,0,0.1);
    z-index: 10;
}

.project-thumbnail {
    width: 100%;
    flex: 1;
    background-size: cover;
    background-position: center;
    background-color: #f5f5f5;
    position: relative;
}

.project-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-thumbnail-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    font-size: 0.8rem;
    color: #666;
}

.project-info {
    padding: 1rem;
    background: var(--overlay-bg);
    color: white;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.project-card:hover .project-info {
    transform: translateY(0);
}

.project-title {
    font-size: 1rem;
    margin-bottom: 0.3rem;
    font-weight: 400;
    color: white;
}

.project-role {
    font-size: 0.8rem;
    color: var(--overlay-text);
    margin-bottom: 0.3rem;
}

.project-year {
    font-size: 0.7rem;
    color: var(--overlay-light);
}

/* Portfolio Responsive */
@media (max-width: 768px) {
    .filter-buttons {
        gap: 1rem;
    }
    
    .filter-btn {
        font-size: 0.75rem;
        padding: 0.2rem 0.4rem;
    }
}

@media (max-width: 900px) {
    .portfolio-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 700px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}