/* ==========================================================================
   Gallery Page — gallery.css
   Depends on: style.css (design tokens must be loaded first)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Page Layout
   -------------------------------------------------------------------------- */
.gallery-page {
    padding-top: var(--header-h);
    min-height: 100svh;
}

/* --------------------------------------------------------------------------
   2. Page Header
   -------------------------------------------------------------------------- */
.gallery-page-header {
    background: var(--clr-bg-alt);
    border-bottom: 1px solid var(--clr-border);
    padding-block: var(--sp-20) var(--sp-16);
}

.gallery-page-header__inner {
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--sp-8);
}

.gallery-page-title {
    font-family: var(--font-serif);
    font-size: clamp(var(--fs-3xl), 5vw, var(--fs-5xl));
    font-weight: 300;
    line-height: var(--lh-tight);
    letter-spacing: -0.02em;
    color: var(--clr-text);
    margin-block: var(--sp-4) var(--sp-6);
}

.gallery-page-desc {
    font-size: var(--fs-lg);
    color: var(--clr-text-muted);
    line-height: var(--lh-loose);
    max-width: 680px;
    margin-bottom: var(--sp-4);
}

.gallery-inline-link {
    color: var(--clr-accent);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: opacity var(--transition-fast);
}

.gallery-inline-link:hover {
    opacity: 0.75;
}

/* --------------------------------------------------------------------------
   3. Tab Section Wrapper
   -------------------------------------------------------------------------- */
.gallery-tabs-section {
    padding-block: var(--sp-12) var(--sp-24);
    /* Justified grid row height — responsive via clamp */
    --justified-row-h: clamp(160px, 22vw, 300px);
}

.gallery-tabs-container {
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: var(--sp-8);
}

/* --------------------------------------------------------------------------
   4. Branch Tabs (Top-Level)
   -------------------------------------------------------------------------- */
.branch-tabs {
    display: flex;
    gap: var(--sp-2);
    margin-bottom: var(--sp-2);
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-full);
    padding: var(--sp-1);
    width: fit-content;
}

.branch-tab {
    padding: var(--sp-2) var(--sp-8);
    border-radius: var(--radius-full);
    font-family: var(--font-sans);
    font-size: var(--fs-sm);
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--clr-text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
    white-space: nowrap;
}

.branch-tab:hover {
    color: var(--clr-text);
}

.branch-tab--active {
    background: var(--clr-accent);
    color: var(--clr-bg);
    box-shadow: var(--shadow-accent);
}

.branch-tab:focus-visible {
    outline: 2px solid var(--clr-accent);
    outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   5. Sub-Category Tabs
   -------------------------------------------------------------------------- */
.sub-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-2);
    padding-block: var(--sp-5) var(--sp-8);
    border-bottom: 1px solid var(--clr-border);
    margin-bottom: var(--sp-8);
    min-height: 52px;
    /* prevent layout shift while JS renders */
}

.sub-tab {
    padding: var(--sp-2) var(--sp-5);
    border-radius: var(--radius-full);
    font-size: var(--fs-sm);
    font-weight: 400;
    color: var(--clr-text-muted);
    background: transparent;
    border: 1px solid var(--clr-border);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast),
        border-color var(--transition-fast);
}

.sub-tab:hover {
    color: var(--clr-text);
    border-color: rgba(255, 255, 255, 0.2);
}

.sub-tab--active {
    background: var(--clr-surface-2);
    color: var(--clr-accent);
    border-color: var(--clr-accent);
}

.sub-tab:focus-visible {
    outline: 2px solid var(--clr-accent);
    outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   6. Image Grid
   -------------------------------------------------------------------------- */
.gallery-grid-wrap {
    position: relative;
    min-height: 300px;
}

/* Justified (Flickr-style) grid */
.gallery-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-start;
}

/* Grid entry animation */
.gallery-grid.transitioning {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.gallery-grid.visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* --------------------------------------------------------------------------
   7. Gallery Cards
   -------------------------------------------------------------------------- */
.g-card {
    /* Justified grid: flex-basis set inline via JS based on image aspect ratio */
    flex-grow: 1;
    flex-shrink: 0;
    min-width: 120px;
    /* prevent micro-slivers */
    max-width: 600px;
    /* prevent single card stretching across full row */
    height: var(--justified-row-h);
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base),
        opacity var(--transition-base);
    animation: cardReveal 0.4s ease both;
}

@keyframes cardReveal {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.g-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Hidden state — mobile show-more */
.g-card--hidden {
    display: none !important;
}

/* Revealed cards fade in */
.g-card--revealed {
    animation: cardReveal 0.4s ease both;
}

.g-card:focus-visible {
    outline: 2px solid var(--clr-accent);
    outline-offset: 3px;
}

/* Row spacer injected by JS to prevent last-row stretching */
.g-card__spacer {
    flex-grow: 999;
    min-width: 0;
    height: 0;
    pointer-events: none;
}

.g-card__img-wrap {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--clr-surface-2);
}

.g-card__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-slow);
}

.g-card:hover .g-card__img {
    transform: scale(1.05);
}

.g-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.55) 0%, transparent 55%);
    opacity: 0;
    transition: opacity var(--transition-base);
    display: flex;
    align-items: flex-end;
    padding: var(--sp-4);
}

.g-card:hover .g-card__overlay {
    opacity: 1;
}

.g-card__zoom-hint {
    font-size: var(--fs-xs);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
}

.g-card__body {
    padding: var(--sp-4) var(--sp-5);
}

.g-card__title {
    font-family: var(--font-serif);
    font-size: var(--fs-lg);
    font-weight: 400;
    color: var(--clr-text);
    margin-bottom: var(--sp-1);
}

.g-card__meta {
    font-size: var(--fs-xs);
    color: var(--clr-text-muted);
    letter-spacing: 0.04em;
}

/* --------------------------------------------------------------------------
   8. Lightbox
   -------------------------------------------------------------------------- */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.88);
    backdrop-filter: blur(10px);
    padding: var(--sp-6);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.lightbox.open {
    opacity: 1;
    pointer-events: all;
}

.lightbox__inner {
    position: relative;
    max-width: 900px;
    width: 100%;
    animation: lightboxIn 0.3s ease both;
}

@keyframes lightboxIn {
    from {
        transform: scale(0.94);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.lightbox__img {
    width: 100%;
    max-height: 75svh;
    object-fit: contain;
    border-radius: var(--radius-lg);
    display: block;
}

.lightbox__caption {
    text-align: center;
    margin-top: var(--sp-4);
}

.lightbox__caption h2 {
    font-family: var(--font-serif);
    font-size: var(--fs-2xl);
    font-weight: 300;
    color: var(--clr-text);
}

.lightbox__caption p {
    font-size: var(--fs-sm);
    color: var(--clr-text-muted);
    margin-top: var(--sp-1);
}

.lightbox__close {
    position: absolute;
    top: calc(-1 * var(--sp-12));
    right: 0;
    width: 40px;
    height: 40px;
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-full);
    color: var(--clr-text);
    font-size: var(--fs-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}

.lightbox__close:hover {
    background: var(--clr-surface-2);
    border-color: var(--clr-accent);
}

/* --------------------------------------------------------------------------
   9. Active nav link
   -------------------------------------------------------------------------- */
.nav-active {
    color: var(--clr-accent) !important;
}

.nav-active::after {
    width: 100% !important;
}

/* --------------------------------------------------------------------------
   10. Show-More Button
   -------------------------------------------------------------------------- */
.show-more-wrap {
    display: flex;
    justify-content: center;
    padding-top: var(--sp-6);
}

.show-more-btn {
    min-width: 180px;
}

/* --------------------------------------------------------------------------
   11. Responsive — Justified Grid
   -------------------------------------------------------------------------- */

/* Mobile: single-column + lower row height */
@media (max-width: 768px) {

    /* Narrower rows so portrait images don't dominate */
    .gallery-tabs-section {
        --justified-row-h: clamp(140px, 45vw, 220px);
    }

    /* Force each card to full row width on mobile */
    .g-card {
        flex-basis: 100% !important;
        max-width: 100%;
    }

    .branch-tabs {
        width: 100%;
        justify-content: center;
    }

    .gallery-page-header {
        padding-block: var(--sp-16) var(--sp-10);
    }

    .gallery-page-desc {
        font-size: var(--fs-base);
    }

    .lightbox__close {
        top: calc(-1 * var(--sp-10));
    }
}

@media (max-width: 480px) {
    .branch-tab {
        padding: var(--sp-2) var(--sp-5);
        font-size: var(--fs-xs);
    }
}