/* Portfolio grid layout - Optimized for performance */
.portfolio-item {
    float: left;
    width: 33.33%;
    padding: 0 15px;
    box-sizing: border-box;
    margin-bottom: 30px;
    will-change: transform;
    contain: layout;
}

/* Clear every third item to ensure rows align properly */
.portfolio-item:nth-child(3n+1) {
    clear: left;
}

.portfolio {
    display: block;
    margin: 0 -15px;
    overflow: hidden;
    contain: layout;
}

.portfolio-image {
    position: relative;
    aspect-ratio: 16/9;
    width: 100%;
    background-color: #f5f5f5;
    overflow: hidden;
    border-radius: 8px;
    margin-bottom: 10px;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout;
}

.portfolio-image img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout;
}

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

.portfolio-image iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    border: none;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout;
}

.portfolio-desc {
    padding: 10px 0;
    contain: layout;
}

.portfolio-desc h3 {
    margin: 0 0 5px 0;
    font-size: 18px;
}

.portfolio-desc h3 a {
    color: #333;
    text-decoration: none;
}

.portfolio-desc span {
    display: block;
    color: #777;
    font-size: 14px;
}

/* Video playing state */
.portfolio-image.video-playing img {
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* Navigation buttons styling */
.video-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 30px 0;
    justify-content: center;
    contain: layout;
}

.video-nav-button {
    padding: 12px 20px;
    background-color: #f8f9fa;
    color: #333;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #e1e4e8;
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    contain: layout;
}

.video-nav-button:hover {
    background-color: #e9ecef;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    text-decoration: none;
    color: #333;
}

.video-nav-button.active {
    background-color: #1a73e8;
    color: white;
    border-color: #1a73e8;
}

.video-nav-button.active:hover {
    background-color: #0d62d1;
    color: white;
}

/* Responsive design */
@media (max-width: 991px) {
    .portfolio-item {
        width: 50%;
    }
    
    .portfolio-item:nth-child(3n+1) {
        clear: none;
    }
    
    .portfolio-item:nth-child(2n+1) {
        clear: left;
    }
}

@media (max-width: 575px) {
    .portfolio-item {
        width: 100%;
        clear: both;
    }
}