/* Main Container */
.wp-photo-wall-container {
    display: block;
    margin: 20px auto;
    padding: 0;

    width: 100%;
    max-width: 100%;
}

/* Group Header */
.wp-photo-wall-group-section {
    width: 100%;
    margin-bottom: 40px;
    content-visibility: auto;
    contain-intrinsic-size: 800px;
}

.wp-photo-wall-group-section:first-child {
    margin-top: 8px;
}

.wp-photo-wall-group-title {
    margin: 0 0 20px;
    padding: 12px 0;
    font-size: clamp(18px, 2vw, 24px);
    line-height: 1.3;
    font-weight: 700;
    color: #1f2328;
    text-align: center;
    letter-spacing: 0.02em;
    position: relative;
}

.wp-photo-wall-group-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
    margin: 10px auto 0;
}

/* Grid Container */
.wp-photo-wall-group-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    width: 100%;
}

.wp-photo-wall-item {
    min-width: 0;
    box-sizing: border-box;
    contain: layout paint;
}

/* Staggered fade-in delay for first 12 items */
.wp-photo-wall-item:nth-child(1) img { animation-delay: 0s; }
.wp-photo-wall-item:nth-child(2) img { animation-delay: 0.05s; }
.wp-photo-wall-item:nth-child(3) img { animation-delay: 0.1s; }
.wp-photo-wall-item:nth-child(4) img { animation-delay: 0.15s; }
.wp-photo-wall-item:nth-child(5) img { animation-delay: 0.2s; }
.wp-photo-wall-item:nth-child(6) img { animation-delay: 0.25s; }
.wp-photo-wall-item:nth-child(7) img { animation-delay: 0.3s; }
.wp-photo-wall-item:nth-child(8) img { animation-delay: 0.35s; }
.wp-photo-wall-item:nth-child(9) img { animation-delay: 0.4s; }
.wp-photo-wall-item:nth-child(10) img { animation-delay: 0.45s; }
.wp-photo-wall-item:nth-child(11) img { animation-delay: 0.5s; }
.wp-photo-wall-item:nth-child(12) img { animation-delay: 0.55s; }

@media (min-width: 600px) {
    .wp-photo-wall-group-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 14px;
    }
}

@media (min-width: 900px) {
    .wp-photo-wall-group-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 16px;
    }
}

/* Item Inner Styling */
.wp-photo-wall-item-inner {
    position: relative;
    aspect-ratio: 3 / 4;
    border-radius: 12px;
    overflow: hidden;
    background: linear-gradient(135deg, #f6f7f9 0%, #eef1f5 100%);
    box-shadow: 0 2px 8px rgba(31, 35, 40, 0.06);
    transition: transform 0.22s ease, box-shadow 0.22s ease, filter 0.22s ease;
    cursor: zoom-in;
    isolation: isolate;
    width: 100%;
    /* GPU acceleration */
    transform: translateZ(0);
    backface-visibility: hidden;
}

html:not(.wp-photo-wall-is-scrolling) .wp-photo-wall-item-inner:hover {
    transform: translateY(-3px) translateZ(0);
    box-shadow: 0 12px 24px rgba(31, 35, 40, 0.14);
    filter: saturate(1.03);
    z-index: 2;
}

/* Ensure trigger FILLS the padded inner container */
.wp-photo-wall-lightbox-trigger {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    cursor: zoom-in;
    display: block;
    z-index: 1;
}

.wp-photo-wall-item img {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;

    /* Crop to fit uniformly */
    object-fit: cover !important;
    object-position: center center !important;

    display: block !important;
    transition: opacity 0.4s ease, transform 0.3s ease;

    /* Fade-in: start invisible, animate on load */
    opacity: 0;
    animation: wp-photo-wall-fade-in 0.5s ease forwards;

    pointer-events: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-user-drag: none;

    /* GPU acceleration for smooth animations */
    transform: translateZ(0);
    backface-visibility: hidden;
}

@keyframes wp-photo-wall-fade-in {
    from {
        opacity: 0;
        transform: scale(0.97) translateZ(0);
    }
    to {
        opacity: 1;
        transform: scale(1) translateZ(0);
    }
}

html:not(.wp-photo-wall-is-scrolling) .wp-photo-wall-item-inner:hover img {
    transform: scale(1.025) translateZ(0);
}

.wp-photo-wall-is-scrolling .wp-photo-wall-item-inner,
.wp-photo-wall-is-scrolling .wp-photo-wall-item img {
    transition: none;
}

/* Aggressive Shield */
.wp-photo-wall-shield {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    background: transparent;
}

/* Lightbox (Minimalist) */
.wp-photo-wall-lightbox {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 2147483000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.22s ease, visibility 0.22s ease;
    /* GPU acceleration */
    will-change: opacity;
    transform: translateZ(0);
}

.wp-photo-wall-lightbox.active {
    opacity: 1;
    visibility: visible;
}

.wp-photo-wall-lightbox-overlay {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 12, 16, 0.9);
    cursor: zoom-out;
}

.wp-photo-wall-lightbox.active .wp-photo-wall-lightbox-overlay {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.wp-photo-wall-lightbox-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    z-index: 100001;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
    transform: scale(0.98) translateZ(0);
    transition: transform 0.22s ease;
    /* GPU acceleration */
    will-change: transform;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.wp-photo-wall-lightbox.active .wp-photo-wall-lightbox-content {
    transform: scale(1) translateZ(0);
}

.wp-photo-wall-lightbox-content img {
    display: block;
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    opacity: 1;
    transition: opacity 0.18s ease;
    pointer-events: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

.wp-photo-wall-lightbox.is-loading .wp-photo-wall-lightbox-content img {
    opacity: 0.35;
}

.wp-photo-wall-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.12);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.32);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.18s ease, transform 0.18s ease;
    z-index: 100002;
}

.wp-photo-wall-close:hover {
    background: rgba(255, 255, 255, 0.22);
    transform: scale(1.1);
}

/* Navigation Buttons */
.wp-photo-wall-prev,
.wp-photo-wall-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%) translateZ(0);
    background: rgba(255, 255, 255, 0.12);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.24);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    z-index: 100002;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.18s ease, transform 0.18s ease;
    /* GPU acceleration */
    will-change: transform;
    backface-visibility: hidden;
}

.wp-photo-wall-prev:hover,
.wp-photo-wall-next:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%) scale(1.1) translateZ(0);
}

.wp-photo-wall-prev {
    left: 20px;
}

.wp-photo-wall-next {
    right: 20px;
}

/* Loader Styling */
.wp-photo-wall-loader {
    text-align: center;
    min-height: 24px;
    padding: 8px 0;
    color: #6b7280;
    font-size: 14px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.18s ease, visibility 0.18s ease;
}

.wp-photo-wall-loader.is-loading {
    opacity: 1;
    visibility: visible;
}

.wp-photo-wall-loader::after {
    content: "";
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    vertical-align: middle;
    font-size: 20px;
    width: 20px;
    height: 20px;
    vertical-align: middle;
    animation: wp-photo-wall-spin 2s infinite linear;
}

.wp-photo-wall-full-image {
    width: auto !important;
    height: auto !important;
    max-width: 90vw !important;
    max-height: 90vh !important;
}

.wp-photo-wall-image-error {
    display: block;
    padding: 16px 20px;
    border-radius: 6px;
    background: #fff;
    color: #1f2328 !important;
    text-decoration: none;
}

body.wp-photo-wall-lightbox-open { overflow: hidden; }

@keyframes wp-photo-wall-spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Download Button */
.wp-photo-wall-download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: fit-content;
    min-width: 220px;
    margin: 30px auto 50px;
    padding: 12px 20px;
    background: #1f2328;
    color: #fff !important;
    text-align: center;
    border-radius: 999px;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 8px 18px rgba(31, 35, 40, 0.18);
}

.wp-photo-wall-download-btn:hover {
    background: #343a40;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
    color: #fff !important;
}

.wp-photo-wall-download-btn .dashicons {
    font-size: 20px;
    width: 20px;
    height: 20px;
    vertical-align: middle;
    margin-right: 8px;
    margin-bottom: 2px;
}

@media (max-width: 599px) {
    .wp-photo-wall-group-grid {
        gap: 10px;
    }

    .wp-photo-wall-prev,
    .wp-photo-wall-next {
        width: 42px;
        height: 42px;
    }

    .wp-photo-wall-prev {
        left: 10px;
    }

    .wp-photo-wall-next {
        right: 10px;
    }

    .wp-photo-wall-close {
        top: 12px;
        right: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .wp-photo-wall-item-inner,
    .wp-photo-wall-item img,
    .wp-photo-wall-lightbox,
    .wp-photo-wall-lightbox-content,
    .wp-photo-wall-close,
    .wp-photo-wall-prev,
    .wp-photo-wall-next,
    .wp-photo-wall-download-btn {
        transition: none;
    }

    .wp-photo-wall-item img {
        animation: none;
        opacity: 1;
    }

    .wp-photo-wall-loader::after {
        animation: none;
    }
}