/* ==========================================================================
   Portfolio Styles — 포트폴리오 그리드, 필터, 오버레이
   ========================================================================== */

/* Portfolio Section */
.portfolio {
    padding: 100px 0;
    background: var(--bg-light);
}

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

.filter-btn {
    padding: 10px 25px;
    background: var(--white);
    border: 2px solid transparent;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-dark);
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--gradient-primary);
    color: var(--white);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.portfolio-item {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.portfolio-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.portfolio-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
    background: var(--bg-light);
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    background: var(--white);
    transition: var(--transition);
}

.portfolio-item:hover .portfolio-image img {
    transform: scale(1.1);
}

.portfolio-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    top: -10px;
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, transparent 100%);
    padding: 2rem;
    color: var(--white);
    transform: translateY(30px);
    transition: var(--transition);
}

.portfolio-item:hover .portfolio-overlay {
    transform: translateY(0);
}

.portfolio-overlay h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.portfolio-overlay p {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

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

.tag {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 0.8rem;
    backdrop-filter: blur(10px);
}

.portfolio-cta {
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
}