/* ===== Portfolio Hero ===== */
.portfolio-hero {
    padding: 10rem 0 4rem;
    text-align: center;
}
.portfolio-hero h1 {
    font-size: clamp(3rem, 6vw, 5rem);
    letter-spacing: -0.03em;
}
.portfolio-hero-sub {
    color: var(--color-text_muted);
    font-size: 1.05rem;
    max-width: 480px;
    margin: 1rem auto 0;
    line-height: 1.7;
}

/* ===== Filter Bar ===== */
.filter-bar {
    padding: 0 0 3rem;
    position: sticky;
    top: 60px;
    z-index: 50;
    background: var(--color-background);
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.filter-btn {
    background: none;
    border: 1px solid rgba(232, 228, 223, 0.12);
    color: var(--color-text_muted);
    font-family: var(--font-body), 'DM Sans', sans-serif;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.5rem 1.25rem;
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover {
    color: var(--color-text);
    border-color: rgba(232, 228, 223, 0.3);
}

.filter-btn.active {
    background: var(--color-accent);
    color: var(--color-background);
    border-color: var(--color-accent);
}

/* ===== Masonry Grid ===== */
.portfolio-grid-section {
    padding: 0 0 6rem;
}

.portfolio-masonry {
    columns: 2;
    column-gap: 1.25rem;
}

.portfolio-item {
    break-inside: avoid;
    margin-bottom: 1.25rem;
}

.portfolio-item-image {
    position: relative;
    overflow: hidden;
}

.portfolio-item-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.portfolio-item:hover .portfolio-item-image img {
    transform: scale(1.03);
}

.portfolio-item-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 2rem;
    background: linear-gradient(to top, rgba(12, 12, 12, 0.75) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.4s;
}

.portfolio-item:hover .portfolio-item-overlay {
    opacity: 1;
}

.portfolio-item-category {
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 0.25rem;
}

.portfolio-item-overlay h3 {
    font-size: 1.375rem;
    color: var(--color-text);
    margin-bottom: 0.25rem;
}

.portfolio-item-overlay p {
    font-size: 0.875rem;
    color: rgba(232, 228, 223, 0.7);
    line-height: 1.5;
    max-width: 320px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .portfolio-hero { padding: 8rem 0 3rem; }
    .portfolio-masonry { columns: 1; }
    .portfolio-item-overlay { opacity: 1; }
    .filter-bar { position: static; padding-bottom: 2rem; }
    .filter-buttons { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 0.5rem; }
}