/* =============================================================================
   SYMPOSIUM GALLERY STYLES - Sidebar Layout
   ============================================================================= */

/* Full-width Banner */
.symposium-banner-full {
    width: 100%;
    margin-bottom: 0;
}

.symposium-banner-full img {
    display: block;
    width: 100%;
}

/* Sidebar Column */
.gallery-sidebar-col {
    padding: 0;
}

.gallery-sidebar {
    padding: 1rem;
    position: sticky;
    top: 70px; /* Below navbar */
}

.sidebar-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--aps-blue);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--aps-blue);
}

/* Sidebar Year Navigation */
.gallery-year-nav-sidebar {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.gallery-year-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem 0.5rem;
    background: white;
    border: 2px solid #dee2e6;
    border-radius: 6px;
    text-decoration: none;
    color: var(--aps-blue);
    transition: all 0.2s ease;
    text-align: center;
}

.gallery-year-btn:hover {
    background: #e9ecef;
    border-color: var(--aps-blue);
    color: var(--aps-blue);
    text-decoration: none;
}

.gallery-year-btn.active {
    background: var(--aps-blue);
    border-color: var(--aps-blue);
    color: white;
}

.gallery-year-btn .year-number {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1;
}

.gallery-year-btn .year-location {
    font-size: 0.7rem;
    opacity: 0.8;
    margin-top: 0.25rem;
}

/* Main Content Column */
.gallery-main-col {
    padding: 0;
}

/* Symposium Header */
.symposium-header {
    padding: 1.5rem 1.5rem 0;
}

/* Symposium Description - Two Column */
.symposium-description {
    padding: 0 1.5rem 1.5rem;
    margin-bottom: 1rem;
}

.symposium-description .col-lg-6 {
    line-height: 1.7;
}

/* Image Grid - CSS Grid */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    padding: 0 1rem;
}

@media (min-width: 768px) {
    .gallery-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

@media (min-width: 992px) {
    .gallery-grid {
        grid-template-columns: repeat(7, 1fr);
        gap: 0.75rem;
        padding: 0 1.5rem;
    }
}

/* Individual Gallery Item */
.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 6px;
    background: #f0f0f0;
    aspect-ratio: 3 / 2;
}

.gallery-link {
    display: block;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.gallery-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.gallery-item:hover .gallery-thumb {
    transform: scale(1.05);
}

/* Caption overlay on hover */
.gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem 0.75rem 0.75rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 100%);
    color: white;
    font-size: 0.75rem;
    line-height: 1.3;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.gallery-item:hover .gallery-caption {
    opacity: 1;
    transform: translateY(0);
}

/* Image count text */
.gallery-main-col > .text-muted {
    padding: 0 1.5rem;
}

/* =============================================================================
   LIGHTBOX
   ============================================================================= */

.gallery-lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gallery-lightbox.active {
    display: flex;
    opacity: 1;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox-image {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.5);
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.gallery-lightbox.active .lightbox-image.loaded {
    opacity: 1;
    transform: scale(1);
}

.lightbox-caption {
    color: white;
    text-align: center;
    padding: 1rem;
    max-width: 800px;
    font-size: 0.95rem;
    opacity: 0.9;
}

/* Close Button */
.lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

/* Navigation Buttons */
.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.lightbox-nav:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lightbox-prev {
    left: 1.5rem;
}

.lightbox-next {
    right: 1.5rem;
}

.lightbox-nav:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Counter */
.lightbox-counter {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    background: rgba(0, 0, 0, 0.5);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

/* =============================================================================
   MOBILE STYLES
   ============================================================================= */

@media (max-width: 991.98px) {
    /* On mobile, sidebar becomes horizontal scroll */
    .gallery-sidebar-col {
        border-bottom: 1px solid #dee2e6;
    }

    .gallery-sidebar {
        padding: 0.75rem 1rem;
        position: static;
    }

    .gallery-year-nav-sidebar {
        flex-direction: row;
        overflow-x: auto;
        gap: 0.5rem;
        padding-bottom: 0.25rem;
        -webkit-overflow-scrolling: touch;
    }

    .gallery-year-btn {
        flex-direction: row;
        gap: 0.5rem;
        padding: 0.5rem 1rem;
        white-space: nowrap;
        min-width: auto;
    }

    .gallery-year-btn .year-number {
        font-size: 1rem;
    }

    .gallery-year-btn .year-location {
        font-size: 0.75rem;
        margin-top: 0;
    }

    .symposium-header {
        padding: 1rem 1rem 0;
    }

    .symposium-description {
        padding: 0 1rem 1rem;
    }

    .gallery-grid {
        padding: 0 0.5rem;
    }

    .gallery-main-col > .text-muted {
        padding: 0 0.5rem;
    }
}

@media (max-width: 576px) {
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .lightbox-nav {
        width: 45px;
        height: 45px;
        font-size: 1.25rem;
    }

    .lightbox-prev {
        left: 0.5rem;
    }

    .lightbox-next {
        right: 0.5rem;
    }

    .lightbox-close {
        top: 0.5rem;
        right: 0.5rem;
        width: 40px;
        height: 40px;
    }
}

/* Touch-friendly on mobile */
@media (hover: none) {
    .gallery-caption {
        opacity: 1;
        transform: translateY(0);
    }

    .gallery-item:hover .gallery-thumb {
        transform: none;
    }
}