.section-title {
    font-family: 'Montserrat', Arial, sans-serif;
    line-height: 1.3;
    color: var(--color-h2-section);
    font-size: var(--size-h2-section);
    text-align: center;
}

.section {
    padding: 100px 0;
}

.portfolio {
    background-color: var(--background-color-accent);
    display: flex;
    flex-direction: column;
    justify-content: center;   
    align-items: center;
    gap: 20px;
}

.title-explanation {
    color: #717182;
    font-family: 'OpenSans', Arial, sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.3;
    text-align: center;
}

.portfolio-menu {
    margin: 20px 0;
    display: flex;
    justify-content: center;   
    align-items: center;
    gap: 10px;
}

.portfolio-list-button {
    color: var(--color-text);
    background-color: var(--background-color);
    border: none;
    border-radius: 20px;
    padding: 10px 20px;
    cursor: pointer;
}

.portfolio-list-button:hover {
    background-color: var(--color-accent);
    color: var(--color-text-accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.portfolio-list-button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    background-color: var(--color-accent);
    color: var(--color-text-accent);
}

.portfolio-list-button.active {
    color: var(--color-text-accent);
    background-color: var(--color-accent);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.portfolio-list-button.active:hover {
    background-color: var(--color-accent);
    opacity: 0.9;
}

.portfolio-list-button:active {
    transform: translateY(0px);
    transition: all 0.05s ease;
}

.gallery {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.gallery-list {
    width: 100%;
    min-width: 0;
    overflow: hidden;
}

.gallery-list.hide {
    display: none;
}

.gallery-list.show {
    display: block;
}

.gallery-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    aspect-ratio: 1 / 1;
    cursor: pointer;
}

.gallery-loading {
    grid-column: 1 / -1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.gallery-loading::after {
    content: "";
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--color-accent);
    border-radius: 50%;
}

.gallery-image-error {
    background-color: var(--background-color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--color-text);
    font-size: 14px;
}

@media (max-width: 1024px) and (min-width: 768px) {
    .gallery {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 15px;
    }
    
    .section {
        padding: 80px 0;
    }
    
    .portfolio {
        padding: 80px 20px;
    }
}

@media (max-width: 768px) {
    .gallery {
        grid-template-columns: minmax(0, 1fr);
        gap: 15px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .portfolio {
        padding: 60px 16px;
    }
    
    .portfolio-menu {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
    
    .portfolio-list-button {
        padding: 8px 16px;
        font-size: 14px;
    }
}