/* ================================================================
   GREENFIELD ACADEMY
   page_gallery.css  —  Gallery Grid & Lightbox Modal
   Maintained by IGL Web Ltd.

   TABLE OF CONTENTS
   ──────────────────────────────────────────────────────────────
   01. Gallery Page Section Wrapper
   02. Filter / Category Tab Bar
   03. Gallery Grid  (CSS columns masonry — preserves aspect ratios)
   04. Gallery Item Card
   05. Gallery Lightbox Modal
   06. Responsive Overrides
   ================================================================ */


/* ================================================================
   01. PAGE HERO / BREADCRUMB BANNER
   ── Reusable banner used at the top of interior pages ──
   ================================================================ */
.page-hero {
    background: linear-gradient(
        115deg,
        var(--clr-secondary-dark) 0%,
        var(--clr-secondary) 60%,
        rgba(245,166,35,0.18) 100%
    );
    padding: 56px 0 48px;
    position: relative;
    overflow: hidden;
}

/* Decorative background circles */
.page-hero::before {
    content: '';
    position: absolute;
    top: -80px;
    right: -80px;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    background: rgba(245,166,35,0.07);
    pointer-events: none;
}
.page-hero::after {
    content: '';
    position: absolute;
    bottom: -60px;
    left: 10%;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    background: rgba(255,255,255,0.04);
    pointer-events: none;
}

.page-hero-inner {
    position: relative;
    z-index: 1;
}

.page-hero-label {
    display: inline-block;
    background: rgba(245,166,35,0.18);
    color: var(--clr-primary);
    font-family: var(--font-body);
    font-size: var(--fs-xs);
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    padding: 5px 16px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(245,166,35,0.3);
    margin-bottom: 14px;
}

.page-hero-title {
    font-family: var(--font-display);
    font-size: clamp(var(--fs-2xl), 4vw, var(--fs-4xl));
    font-weight: 800;
    color: var(--clr-white);
    line-height: 1.2;
    margin-bottom: 18px;
}
.page-hero-title em {
    color: var(--clr-primary);
    font-style: italic;
}

/* Breadcrumb */
.page-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.page-breadcrumb a {
    font-size: var(--fs-sm);
    color: rgba(255,255,255,0.65);
    font-weight: 500;
    transition: var(--trans-fast);
}
.page-breadcrumb a:hover { color: var(--clr-primary); }
.page-breadcrumb .bc-sep {
    color: rgba(255,255,255,0.35);
    font-size: var(--fs-xs);
}
.page-breadcrumb .bc-current {
    font-size: var(--fs-sm);
    color: var(--clr-primary);
    font-weight: 600;
}


/* ================================================================
   01. GALLERY PAGE — SECTION WRAPPER
   ================================================================ */
.gallery-section {
    padding: var(--space-2xl) 0 var(--space-3xl);
    background: var(--clr-off-white);
    min-height: 60vh;
}


/* ================================================================
   02. FILTER / CATEGORY TAB BAR
   ================================================================ */
.gallery-filter-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.gallery-filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 22px;
    border-radius: var(--radius-full);
    border: 1.5px solid var(--clr-border);
    background: var(--clr-white);
    color: var(--clr-text-muted);
    font-family: var(--font-body);
    font-size: var(--fs-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--trans-base);
    box-shadow: var(--shadow-xs);
}
.gallery-filter-btn i { font-size: 0.75rem; }
.gallery-filter-btn:hover {
    border-color: var(--clr-primary);
    color: var(--clr-primary-dark);
    background: var(--clr-primary-xlight);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}
.gallery-filter-btn.active {
    background: var(--clr-primary);
    border-color: var(--clr-primary);
    color: var(--clr-white);
    box-shadow: var(--shadow-gold);
    transform: translateY(-2px);
}


/* ================================================================
   03. GALLERY GRID — CSS COLUMNS MASONRY
   Preserves each image's natural aspect ratio.
   Images fill column width; heights vary naturally.
   No odd empty gaps between items of different heights.
   ================================================================ */
.gallery-grid {
    column-count: 4;
    column-gap: 18px;
    orphans: 1;
    widows: 1;
}

/* Prevent items from breaking across columns */
.gallery-item {
    break-inside: avoid;
    -webkit-column-break-inside: avoid;
    page-break-inside: avoid;
    margin-bottom: 18px;
    display: block;

    /* Animate in when JS adds .visible class */
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.35s ease;
}
.gallery-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delay via nth-child */
.gallery-item:nth-child(1)  { transition-delay: 0.05s; }
.gallery-item:nth-child(2)  { transition-delay: 0.10s; }
.gallery-item:nth-child(3)  { transition-delay: 0.15s; }
.gallery-item:nth-child(4)  { transition-delay: 0.20s; }
.gallery-item:nth-child(5)  { transition-delay: 0.25s; }
.gallery-item:nth-child(6)  { transition-delay: 0.30s; }
.gallery-item:nth-child(7)  { transition-delay: 0.35s; }
.gallery-item:nth-child(8)  { transition-delay: 0.40s; }
.gallery-item:nth-child(9)  { transition-delay: 0.45s; }
.gallery-item:nth-child(10) { transition-delay: 0.50s; }
.gallery-item:nth-child(n+11) { transition-delay: 0.55s; }


/* ================================================================
   04. GALLERY ITEM CARD
   ================================================================ */
.gallery-card {
    background: var(--clr-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--clr-border);
    cursor: pointer;
    position: relative;
    transition: var(--trans-slow);
    display: block;
    width: 100%;
}
.gallery-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--clr-primary-light);
}

/* Image wrapper — no fixed height; image dictates height */
.gallery-card-img-wrap {
    position: relative;
    overflow: hidden;
    display: block;
    width: 100%;
    background: var(--clr-light);
}

.gallery-card-img-wrap img {
    width: 100%;
    height: auto;           /* natural aspect ratio preserved */
    display: block;
    object-fit: cover;
    transition: transform 0.55s cubic-bezier(.4,0,.2,1);
}
.gallery-card:hover .gallery-card-img-wrap img {
    transform: scale(1.06);
}

/* Hover overlay with zoom icon */
.gallery-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        160deg,
        rgba(26,60,110,0.0) 0%,
        rgba(26,60,110,0.72) 100%
    );
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.35s ease;
}
.gallery-card:hover .gallery-card-overlay { opacity: 1; }

.gallery-zoom-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: var(--clr-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--clr-white);
    font-size: var(--fs-lg);
    box-shadow: var(--shadow-gold);
    transform: scale(0.7);
    transition: transform 0.35s cubic-bezier(.4,0,.2,1);
}
.gallery-card:hover .gallery-zoom-icon { transform: scale(1); }

/* Caption (optional — shown below image inside the card) */
.gallery-card-caption {
    padding: 12px 14px;
    font-size: var(--fs-xs);
    font-weight: 600;
    color: var(--clr-text-body);
    line-height: 1.4;
    border-top: 1px solid var(--clr-border);
    background: var(--clr-white);
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.gallery-card-caption i {
    color: var(--clr-primary);
    font-size: 0.7rem;
    margin-top: 2px;
    flex-shrink: 0;
}

/* No results message */
.gallery-empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--clr-text-muted);
}
.gallery-empty i {
    font-size: 3rem;
    color: var(--clr-border);
    margin-bottom: 16px;
    display: block;
}
.gallery-empty p {
    font-size: var(--fs-md);
    font-weight: 500;
}


/* ================================================================
   05. GALLERY LIGHTBOX MODAL
   ================================================================ */
.gallery-lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;

    /* Hidden state */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s ease, visibility 0.35s ease;
}
.gallery-lightbox.open {
    opacity: 1;
    visibility: visible;
}

/* Backdrop */
.lightbox-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(10, 18, 38, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: zoom-out;
}

/* Dialog box */
.lightbox-dialog {
    position: relative;
    z-index: 1;
    max-width: min(860px, 96vw);
    width: 100%;
    background: var(--clr-white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);

    transform: scale(0.88) translateY(24px);
    transition: transform 0.4s cubic-bezier(.4,0,.2,1);
}
.gallery-lightbox.open .lightbox-dialog {
    transform: scale(1) translateY(0);
}

/* Image inside dialog */
.lightbox-image-wrap {
    background: var(--clr-text-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    max-height: 72vh;
    overflow: hidden;
}
.lightbox-image-wrap img {
    width: 100%;
    height: auto;
    max-height: 72vh;
    object-fit: contain;
    display: block;
}

/* Caption bar at bottom */
.lightbox-caption-bar {
    background: var(--clr-white);
    padding: 16px 24px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
    border-top: 1px solid var(--clr-border);
}
.lightbox-caption-text {
    font-size: var(--fs-sm);
    color: var(--clr-text-body);
    font-weight: 500;
    line-height: 1.5;
    flex: 1;
}
.lightbox-caption-text strong {
    display: block;
    font-family: var(--font-display);
    font-size: var(--fs-md);
    color: var(--clr-text-dark);
    font-weight: 700;
    margin-bottom: 4px;
}
.lightbox-caption-count {
    font-size: var(--fs-xs);
    color: var(--clr-text-muted);
    white-space: nowrap;
    align-self: center;
    background: var(--clr-light);
    padding: 4px 10px;
    border-radius: var(--radius-full);
}

/* Close button */
.lightbox-close {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.12);
    border: 1.5px solid rgba(255,255,255,0.25);
    color: var(--clr-white);
    font-size: var(--fs-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 2;
    transition: var(--trans-fast);
    backdrop-filter: blur(6px);
}
.lightbox-close:hover {
    background: var(--clr-accent);
    border-color: var(--clr-accent);
}

/* Prev / Next arrows */
.lightbox-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: rgba(255,255,255,0.10);
    border: 1.5px solid rgba(255,255,255,0.22);
    color: var(--clr-white);
    font-size: var(--fs-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 2;
    transition: var(--trans-fast);
    backdrop-filter: blur(6px);
}
.lightbox-nav-btn:hover {
    background: var(--clr-primary);
    border-color: var(--clr-primary);
    box-shadow: var(--shadow-gold);
}
.lightbox-prev { left: -60px; }
.lightbox-next { right: -60px; }


/* ================================================================
   06. RESPONSIVE OVERRIDES — gallery page
   ================================================================ */
@media (max-width: 1199px) {
    .gallery-grid { column-count: 3; }
}
@media (max-width: 767px) {
    .gallery-grid { column-count: 2; column-gap: 12px; }
    .gallery-item { margin-bottom: 12px; }
    .gallery-section { padding: var(--space-xl) 0 var(--space-2xl); }
    .lightbox-prev { left: -18px; }
    .lightbox-next { right: -18px; }
    .lightbox-nav-btn {
        width: 36px;
        height: 36px;
        font-size: var(--fs-sm);
    }
}
@media (max-width: 480px) {
    .gallery-grid { column-count: 1; }
    .lightbox-dialog { border-radius: var(--radius-lg); }
    .lightbox-nav-btn { display: none; } /* swipe on mobile instead */
    .lightbox-caption-bar { flex-direction: column; gap: 8px; }
}