/* ==========================================================================
   PORTFOLIO STYLES
   ========================================================================== */

/* Portfolio container and layout */
.portfolio-container {
    display: flex;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
    align-items: flex-start;
}

.portfolio-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Portfolio item cards */
.portfolio-item {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    padding: 1.5rem;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-sm);
    transition: transform var(--animation-duration) var(--animation-easing), 
                box-shadow var(--animation-duration) ease, 
                border-color 0.2s ease;
    display: flex;
    flex-direction: column;
}

.portfolio-item:hover {
    transform: var(--card-hover-transform);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-border-light);
}

/* Portfolio item links */
.portfolio-item__image-link,
.portfolio-item__journal-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.portfolio-item__journal-link:hover .portfolio-item__journal {
    color: var(--color-primary);
}

/* Image containers */
.portfolio-item__image-container {
    margin-bottom: 1rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.portfolio-item__image-frame {
    background: white;
    padding: 1rem;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    display: inline-block;
    max-width: 100%;
}

.portfolio-item__image {
    max-width: 100%;
    height: auto;
    display: block;
    transition: transform 0.2s ease;
}

.portfolio-item__image-link:hover .portfolio-item__image {
    transform: scale(1.02);
}

/* Content styling */
.portfolio-item__content {
    flex-shrink: 0;
    text-align: center;
}

.portfolio-item__journal {
    margin: 0 0 0.5rem;
    color: var(--color-text-primary);
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.2;
    transition: color 0.2s ease;
    text-align: center;
}

.portfolio-item__year {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
}

/* Journal-specific colors using CSS variables */
.portfolio-item--macromolecules .portfolio-item__journal {
    color: var(--color-accent);
}

.portfolio-item--acs-macro-letters .portfolio-item__journal {
    color: var(--color-secondary);
}

.portfolio-item--angewandte .portfolio-item__journal {
    color: var(--color-primary);
}

.portfolio-item--biomacromolecules .portfolio-item__journal {
    color: var(--color-primary-dark);
}

.portfolio-item--acs-applied .portfolio-item__journal {
    color: var(--color-secondary);
}

.portfolio-item--langmuir .portfolio-item__journal {
    color: var(--color-accent);
}

/* Responsive design */
@media (max-width: 768px) {
    .portfolio-container {
        flex-direction: column;
        gap: 1.5rem;
        max-width: 100%;
    }
    
    .portfolio-column {
        gap: 1.5rem;
    }
    
    .portfolio-item {
        padding: 1.25rem;
    }
    
    .portfolio-item__journal {
        font-size: 1.1rem;
    }
    
    .portfolio-item__image-frame {
        padding: 0.75rem;
    }
}