/* =================================================
   PORTFOLIO LIGHTBOX
   Mobile-first: base = 320px, progressive enhancement via min-width
   ================================================= */
.portfolio-lightbox {
    position: fixed;
    inset: 0;
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
}

.portfolio-lightbox[hidden] {
    display: none !important;
}

.portfolio-lightbox__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 10, 0.94);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.portfolio-lightbox__stage {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: min(92vw, 1100px);
    max-height: 70vh;
    margin: 0 var(--space-4);
}

.portfolio-lightbox__img {
    display: block;
    max-width: 100%;
    max-height: 70vh;
    width: auto;
    height: auto;
    object-fit: contain;
    opacity: 0;
    transition: opacity 0.25s ease;
    user-select: none;
    -webkit-user-drag: none;
}

.portfolio-lightbox__img.is-loaded {
    opacity: 1;
}

.portfolio-lightbox__loader {
    position: absolute;
    width: 2rem;
    height: 2rem;
    border: 2px solid rgba(250, 248, 245, 0.2);
    border-top-color: var(--avorio);
    border-radius: 50%;
    animation: portfolioLightboxSpin 0.8s linear infinite;
}

.portfolio-lightbox__loader[hidden] {
    display: none;
}

@keyframes portfolioLightboxSpin {
    to { transform: rotate(360deg); }
}

.portfolio-lightbox__close,
.portfolio-lightbox__nav {
    position: fixed;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(250, 248, 245, 0.2);
    background: rgba(250, 248, 245, 0.08);
    color: var(--avorio);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.portfolio-lightbox__close:hover,
.portfolio-lightbox__nav:hover:not(:disabled) {
    background: rgba(250, 248, 245, 0.16);
    border-color: rgba(250, 248, 245, 0.35);
}

.portfolio-lightbox__close {
    top: var(--space-5);
    right: var(--space-5);
    width: 44px;
    height: 44px;
    border-radius: 0;
    font-size: 1.1rem;
}

.portfolio-lightbox__nav {
    top: auto;
    bottom: var(--space-12);
    transform: none;
    width: 44px;
    height: 44px;
    border-radius: 0;
}

.portfolio-lightbox__nav--prev {
    left: var(--space-4);
}

.portfolio-lightbox__nav--next {
    right: var(--space-4);
}

.portfolio-lightbox__nav:disabled {
    opacity: 0.25;
    cursor: default;
}

.portfolio-lightbox__counter {
    position: fixed;
    bottom: var(--space-5);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    margin: 0;
    font-family: var(--font-sans);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: rgba(250, 248, 245, 0.75);
}

/* =================================================
   RESPONSIVE — min-width progressive enhancement
   ================================================= */
@media (min-width: 768px) {
    .portfolio-lightbox__stage {
        margin: 0 3.5rem;
        max-height: 82vh;
    }

    .portfolio-lightbox__img {
        max-height: 82vh;
    }

    .portfolio-lightbox__nav {
        top: 50%;
        bottom: auto;
        transform: translateY(-50%);
    }

    .portfolio-lightbox__nav--prev {
        left: var(--space-4);
    }

    .portfolio-lightbox__nav--next {
        right: var(--space-4);
    }
}