/* Portfolio Masonry Layout with CSS Grid */
.portfolio-section {
    padding: 4rem 0;
    background: #fafafa;
}

.portfolio-masonry {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    grid-auto-rows: 200px;
    grid-gap: 1rem;
    grid-auto-flow: dense;
    margin-bottom: 3rem;
    padding: 0 1rem;
}

/* Card Size Variations */
.portfolio-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease-out forwards;
    cursor: pointer;
}

/* Small cards - 1x1 */
.portfolio-card--small {
    grid-row: span 1;
    grid-column: span 1;
}

/* Medium cards - 1x1.5 */
.portfolio-card--medium {
    grid-row: span 2;
    grid-column: span 1;
}

/* Large cards - 2x2 */
.portfolio-card--large {
    grid-row: span 2;
    grid-column: span 2;
}

/* Wide cards - 2x1 */
.portfolio-card--wide {
    grid-row: span 1;
    grid-column: span 2;
}

/* Tall cards - 1x2.5 */
.portfolio-card--tall {
    grid-row: span 3;
    grid-column: span 1;
}

.portfolio-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.portfolio-card__image {
    position: relative;
    overflow: hidden;
    height: 100%;
    width: 100%;
}

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

.portfolio-card:hover .portfolio-card__image img {
    transform: scale(1.05);
}

.portfolio-card__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.3) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: flex-end;
    padding: 1.5rem;
}

.portfolio-card:hover .portfolio-card__overlay {
    opacity: 1;
}

.portfolio-card__content {
    color: white;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.portfolio-card:hover .portfolio-card__content {
    transform: translateY(0);
}

.portfolio-card__title {
    font-family: 'Playfair Display', serif;
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 0.5rem 0;
    line-height: 1.3;
}

.portfolio-card__meta {
    font-family: 'Inter', sans-serif;
    font-size: 0.875rem;
    opacity: 0.9;
    margin: 0;
}

/* Loading States */
.portfolio-loading {
    display: none;
    text-align: center;
    padding: 2rem;
    color: #666;
    grid-column: 1 / -1;
}

.portfolio-loading.active {
    display: block;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #d4af37;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

.portfolio-loading p {
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    margin: 0;
}

/* Animations */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Staggered animation for cards */
.portfolio-card:nth-child(1) { animation-delay: 0.1s; }
.portfolio-card:nth-child(2) { animation-delay: 0.2s; }
.portfolio-card:nth-child(3) { animation-delay: 0.3s; }
.portfolio-card:nth-child(4) { animation-delay: 0.4s; }
.portfolio-card:nth-child(5) { animation-delay: 0.5s; }
.portfolio-card:nth-child(6) { animation-delay: 0.6s; }
.portfolio-card:nth-child(7) { animation-delay: 0.7s; }
.portfolio-card:nth-child(8) { animation-delay: 0.8s; }
.portfolio-card:nth-child(9) { animation-delay: 0.9s; }
.portfolio-card:nth-child(10) { animation-delay: 1s; }
.portfolio-card:nth-child(11) { animation-delay: 1.1s; }
.portfolio-card:nth-child(12) { animation-delay: 1.2s; }

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
}

/* Responsive Design */
@media (max-width: 1400px) {
    .portfolio-masonry {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        grid-auto-rows: 180px;
    }
}

@media (max-width: 1200px) {
    .portfolio-masonry {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        grid-auto-rows: 160px;
    }
    
    .portfolio-card__overlay {
        padding: 1.25rem;
    }
    
    .portfolio-card__title {
        font-size: 1.125rem;
    }
}

@media (max-width: 992px) {
    .portfolio-section {
        padding: 3rem 0;
    }
    
    .portfolio-masonry {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        grid-auto-rows: 150px;
    }
    
    /* Simplify card sizes on medium screens */
    .portfolio-card--large {
        grid-row: span 2;
        grid-column: span 1;
    }
    
    .portfolio-card--wide {
        grid-row: span 1;
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    .portfolio-masonry {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        grid-auto-rows: 140px;
        grid-gap: 0.75rem;
    }
    
    .portfolio-card__title {
        font-size: 1rem;
    }
    
    .portfolio-card__meta {
        font-size: 0.8rem;
    }
}

@media (max-width: 576px) {
    .portfolio-section {
        padding: 2rem 0;
    }
    
    .portfolio-masonry {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        grid-auto-rows: 120px;
        grid-gap: 0.5rem;
        padding: 0 0.5rem;
    }
    
    .portfolio-card {
        border-radius: 8px;
    }
    
    .portfolio-card__overlay {
        padding: 1rem;
    }
    
    /* All cards become similar size on mobile */
    .portfolio-card--small,
    .portfolio-card--medium,
    .portfolio-card--large,
    .portfolio-card--wide,
    .portfolio-card--tall {
        grid-row: span 1;
        grid-column: span 1;
    }
    
    .portfolio-card__title {
        font-size: 0.9rem;
    }
    
    .portfolio-card__meta {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .portfolio-masonry {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: 100px;
    }
}

@media (max-width: 360px) {
    .portfolio-masonry {
        grid-template-columns: 1fr;
        grid-auto-rows: 200px;
    }
}