.portfolio-fullscreen { background: #0a0a0a; margin: -1px -1px 0; }
.portfolio-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px; }
@media (max-width: 1000px) { .portfolio-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .portfolio-grid { grid-template-columns: 1fr; } }

.portfolio-item { position: relative; aspect-ratio: 1/1; overflow: hidden; cursor: pointer; background: #111; }
.portfolio-item img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.5s ease; }
.portfolio-item:hover img { transform: scale(1.08); }
.portfolio-overlay { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.85) 100%); opacity: 0; transition: opacity 0.35s ease; display: flex; flex-direction: column; justify-content: flex-end; padding: 22px; }
.portfolio-item:hover .portfolio-overlay { opacity: 1; }
.portfolio-overlay h3 { color: #fff; margin: 0 0 4px; font-size: 17px; }
.portfolio-overlay span { color: rgba(255,255,255,0.7); font-size: 12px; letter-spacing: 0.5px; text-transform: uppercase; }
.portfolio-item:focus-visible { outline: 3px solid #00d4ff; outline-offset: -3px; }

.lightbox-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.92); z-index: 1000; display: none; align-items: center; justify-content: center; padding: 40px; }
.lightbox-overlay.open { display: flex; }
.lightbox-overlay img { max-width: 90vw; max-height: 80vh; object-fit: contain; border-radius: 6px; }
.lightbox-caption { position: absolute; bottom: 30px; left: 0; right: 0; text-align: center; color: #fff; font-size: 14px; }
.lightbox-close { position: absolute; top: 24px; right: 28px; background: none; border: none; color: #fff; font-size: 32px; cursor: pointer; line-height: 1; }
.lightbox-close:focus-visible { outline: 2px solid #00d4ff; }
.lightbox-nav { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,0.08); border: none; color: #fff; font-size: 28px; width: 50px; height: 50px; border-radius: 50%; cursor: pointer; }
.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

.portfolio-header { text-align: center; padding: 70px 24px 40px; color: #fff; }
.portfolio-header h1 { font-size: clamp(32px, 5vw, 56px); margin: 0 0 12px; }
.portfolio-header p { color: rgba(255,255,255,0.6); font-size: 17px; }