/**
 * Modern Gallery CSS
 */

/* CSS Custom Properties for Theming */
:root {
    --gallery-primary-color: #B44406;
    --gallery-bg-color: #333;
    --gallery-text-color: #efefef;
    --gallery-border-color: #666;
    --gallery-hover-opacity: 0.67;
    --gallery-transition-duration: 0.3s;
    --gallery-slideshow-delay: 2500ms;
    --gallery-thumb-size: 74px;
    --gallery-main-width: 750px;
    --gallery-main-height: 460px;
    --gallery-z-modal: 10000;
    --gallery-z-overlay: 10001;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Modern Gallery Container */
.modern-gallery {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin-inline: auto;
    padding: 0;
    contain: layout style;
}

@media (min-width: 1024px) {
    .modern-gallery {
        grid-template-columns: var(--gallery-main-width) 1fr;
        gap: 2rem;
    }
}

/* Main Image Display Area */
.gallery-main {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.slideshow-container {
    position: relative;
    width: 100%;
    max-width: var(--gallery-main-width);
    height: var(--gallery-main-height);
    background: var(--gallery-bg-color);
    border: 1px solid var(--gallery-border-color);
    overflow: hidden;
    border-radius: 4px;
    contain: layout style paint;
}

@media (max-width: 1023px) {
    .slideshow-container {
        height: auto;
        min-height: 300px;
        max-height: 70vh;
    }
}

/* Loading Indicator */
.loader {
    position: absolute;
    inset: 0;
    background: var(--gallery-bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--gallery-transition-duration);
}

.loader.active {
    opacity: 1;
    pointer-events: all;
}

.loader::after {
    content: '';
    width: 40px;
    height: 40px;
    border: 4px solid var(--gallery-border-color);
    border-top-color: var(--gallery-primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Slideshow */
.slideshow {
    position: relative;
    width: auto;
    height: 100%;
    display: flex;
    flex-direction: column;
    margin: 0;
}

.image-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: #000;
}

.image-wrapper img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    transition: opacity var(--gallery-transition-duration);
    will-change: opacity;
}

.image-wrapper img.fade-in {
    opacity: 1;
}

.image-wrapper img.fade-out {
    opacity: 0;
}

/* Image Caption */
.image-caption {
    padding: 1rem;
    background: var(--gallery-bg-color);
    border-top: 1px solid var(--gallery-border-color);
    color: var(--gallery-text-color);
    min-height: 60px;
}

.image-title {
    font-weight: bold;
    font-size: clamp(1rem, 2.5vw, 1.2em);
    margin-bottom: 0.5rem;
}

.image-desc {
    line-height: 1.5;
    font-size: 0.9em;
}

/* Navigation Arrows */
.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.6);
    color: var(--gallery-text-color);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 5;
    transition: opacity var(--gallery-transition-duration),
    background-color var(--gallery-transition-duration),
    transform var(--gallery-transition-duration);
    opacity: 0;
    will-change: opacity, transform;
}

.slideshow-container:hover .nav-arrow {
    opacity: 1;
}

.nav-arrow:hover,
.nav-arrow:focus-visible {
    background: var(--gallery-primary-color);
    outline: 2px solid var(--gallery-text-color);
    outline-offset: 2px;
}

.nav-arrow:active {
    transform: translateY(-50%) scale(0.95);
}

.nav-prev {
    left: 1rem;
}

.nav-next {
    right: 1rem;
}

@media (max-width: 767px) {
    .nav-arrow {
        opacity: 1;
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }

    .nav-prev {
        left: 0.5rem;
    }

    .nav-next {
        right: 0.5rem;
    }
}

/* Controls */
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    background: var(--gallery-bg-color);
    border: 1px solid var(--gallery-border-color);
    border-radius: 4px;
}

@media (min-width: 1024px) {
    .controls {
        flex-wrap: nowrap;
        justify-content: flex-start;
        gap: 0.75rem;
        padding: 0.5rem 0.75rem;
    }
}

.controls-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-shrink: 0;
}

@media (min-width: 1024px) {
    .controls-group {
        gap: 0.375rem;
    }
}

.control-btn {
    padding: 0.5rem 1rem;
    background: var(--gallery-bg-color);
    color: var(--gallery-text-color);
    border: 1px solid var(--gallery-border-color);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: none;
    transition: background-color var(--gallery-transition-duration),
    color var(--gallery-transition-duration),
    border-color var(--gallery-transition-duration),
    transform var(--gallery-transition-duration);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

@media (min-width: 1024px) {
    .control-btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.85rem;
        gap: 0.375rem;
    }
}

.control-btn:hover,
.control-btn:focus-visible {
    background: var(--gallery-primary-color);
    color: #fff;
    border-color: #000;
}

.control-btn:active {
    transform: scale(0.98);
}

.control-btn.active {
    background: var(--gallery-primary-color);
    color: #fff;
}

.play-icon,
.pause-icon {
    display: none;
}

.control-btn.playing .play-icon {
    display: none;
}

.control-btn.playing .pause-icon {
    display: inline;
}

.control-btn:not(.playing) .play-icon {
    display: inline;
}

.control-btn:not(.playing) .pause-icon {
    display: none;
}

.download-btn {
    display: inline-flex;
}

/* Thumbnail Navigation */
.gallery-thumbs {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

@media (min-width: 1024px) {
    .gallery-thumbs {
        border-left: 1px solid var(--gallery-border-color);
        padding-left: 1rem;
        min-height: var(--gallery-main-height);
    }
}

.thumbs-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

@media (min-width: 1024px) {
    .thumbs-list {
        grid-template-columns: repeat(3, 1fr);
    }
}

.thumbs-list li {
    margin: 0;
    padding: 0;
}

.thumb {
    display: block;
    padding: 2px;
    border: 2px solid transparent;
    border-radius: 4px;
    transition: border-color var(--gallery-transition-duration),
    transform var(--gallery-transition-duration);
    cursor: pointer;
    overflow: hidden;
    background: var(--gallery-bg-color);
    will-change: transform;
}

.thumb:hover,
.thumb:focus-visible {
    border-color: var(--gallery-primary-color);
    transform: scale(1.05);
}

.thumb.active {
    border-color: var(--gallery-primary-color);
    box-shadow: 0 0 0 2px var(--gallery-primary-color);
}

.thumb img {
    display: block;
    opacity: var(--gallery-hover-opacity);
    transition: opacity var(--gallery-transition-duration);
    margin: 0 auto;
}

.thumb:hover img,
.thumb:focus-visible img,
.thumb.active img {
    opacity: 1;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 1rem 0;
}

.pagination button,
.pagination a {
    padding: 0.5rem 0.75rem;
    background: var(--gallery-bg-color);
    color: var(--gallery-text-color);
    border: 1px solid var(--gallery-border-color);
    border-radius: 4px;
    text-decoration: none;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color var(--gallery-transition-duration),
    color var(--gallery-transition-duration),
    border-color var(--gallery-transition-duration);
    min-width: 2.5rem;
    text-align: center;
}

.pagination button:hover,
.pagination a:hover,
.pagination button:focus-visible,
.pagination a:focus-visible {
    background: var(--gallery-primary-color);
    color: #fff;
    border-color: #000;
}

.pagination .current {
    background: var(--gallery-primary-color);
    color: #fff;
    border-color: #000;
    font-weight: bold;
}

.pagination .ellipsis {
    border: none;
    background: transparent;
    cursor: default;
    padding: 0.5rem 0.25rem;
}

.pagination .ellipsis:hover {
    background: transparent;
    color: var(--gallery-text-color);
}

/* Accessibility */
.thumb:focus-visible,
.control-btn:focus-visible,
.nav-arrow:focus-visible {
    outline: 3px solid var(--gallery-primary-color);
    outline-offset: 2px;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .thumb,
    .control-btn,
    .nav-arrow {
        border-width: 2px;
    }
}

/* Enlarge Button */
.enlarge-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(0, 0, 0, 0.7);
    color: var(--gallery-text-color);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 4px;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 6;
    transition: opacity var(--gallery-transition-duration),
    background-color var(--gallery-transition-duration);
    opacity: 0;
}

.image-wrapper:hover .enlarge-btn {
    opacity: 1;
}

.enlarge-btn:focus-visible,
.image-wrapper:focus-within .enlarge-btn {
    opacity: 1;
}

.enlarge-btn:hover,
.enlarge-btn:focus-visible {
    background: var(--gallery-primary-color);
    outline: 2px solid var(--gallery-text-color);
    outline-offset: 2px;
}

/* Modal/Lightbox */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: var(--gallery-z-modal);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    opacity: 0;
    transition: opacity var(--gallery-transition-duration);
    contain: layout style paint;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    position: relative;
    max-width: 85vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.modal-image-wrapper {
    max-width: 100%;
    max-height: calc(95vh - 100px);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.modal-image-wrapper img {
    max-width: 100%;
    max-height: calc(95vh - 100px);
    width: auto;
    height: auto;
    object-fit: contain;
}

.modal-close {
    position: absolute;
    top: -3.5rem;
    right: 0;
    background: transparent;
    color: var(--gallery-text-color);
    border: 2px solid var(--gallery-text-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--gallery-z-overlay);
    transition: background-color var(--gallery-transition-duration),
    border-color var(--gallery-transition-duration);
}

.modal-close:hover,
.modal-close:focus-visible {
    background: var(--gallery-primary-color);
    border-color: var(--gallery-primary-color);
    outline: none;
}

.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.1);
    color: var(--gallery-text-color);
    border: 2px solid rgba(255, 255, 255, 0.3);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--gallery-z-overlay);
    transition: background-color var(--gallery-transition-duration),
    border-color var(--gallery-transition-duration);
}

.modal-nav:hover,
.modal-nav:focus-visible {
    background: var(--gallery-primary-color);
    border-color: var(--gallery-primary-color);
    outline: none;
}

.modal-prev {
    left: 1rem;
}

.modal-next {
    right: 1rem;
}

.modal-caption {
    margin-top: 1rem;
    text-align: center;
    color: var(--gallery-text-color);
    max-width: 90vw;
}

.modal-caption #modal-title {
    font-weight: bold;
    font-size: clamp(1rem, 2.5vw, 1.2em);
    margin-bottom: 0.5rem;
}

.modal-caption #modal-counter {
    font-size: 0.9em;
    opacity: 0.8;
    margin-bottom: 0.75rem;
}

.modal-download {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gallery-primary-color);
    color: #fff;
    border: 1px solid var(--gallery-primary-color);
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.9rem;
    transition: background-color var(--gallery-transition-duration),
    border-color var(--gallery-transition-duration);
    margin-top: 0.5rem;
}

.modal-download:hover,
.modal-download:focus-visible {
    background: #d4550a;
    border-color: #d4550a;
    outline: 2px solid var(--gallery-text-color);
    outline-offset: 2px;
}

@media (max-width: 1023px) {
    .modal-overlay {
        padding: 1rem;
    }

    .modal-close {
        top: 0.5rem;
        right: 0.5rem;
        width: 35px;
        height: 35px;
        font-size: 1.5rem;
    }

    .modal-nav {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }

    .modal-prev {
        left: 0.5rem;
    }

    .modal-next {
        right: 0.5rem;
    }

    .enlarge-btn {
        opacity: 1;
        top: 0.5rem;
        right: 0.5rem;
        width: 35px;
        height: 35px;
        font-size: 1.2rem;
    }
}

/* Print Styles */
@media print {
    .modern-gallery {
        display: block;
    }

    .controls,
    .gallery-thumbs,
    .pagination,
    .nav-arrow,
    .enlarge-btn,
    .modal-overlay {
        display: none !important;
    }

    .slideshow-container {
        page-break-inside: avoid;
    }
}