/* Academic Video Gallery Theme - Modern Academic Media Hub */
:root {
    --avg-gold: #CC822E;
    --avg-gold-hover: #b47023;
    --avg-gold-bg: #fff8f0;
    --avg-gold-glow: rgba(204, 130, 46, 0.28);
    --avg-border-color: #e5e7eb;
    --avg-text-main: #0f172a;
    --avg-text-muted: #475569;
    --avg-card-bg: #ffffff;
    --avg-radius: 10px;
}

.avg-hub-wrapper {
    max-width: 1360px;
    margin: 40px auto;
    padding: 0 20px;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

/* Header */
.avg-hub-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 18px;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 2px solid #f1f5f9;
}

.avg-title-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.avg-kicker {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--avg-gold);
    text-transform: uppercase;
}

.avg-main-heading {
    color: var(--avg-gold);
    font-size: 1.65rem;
    font-weight: 800;
    margin: 0;
    line-height: 1.2;
    letter-spacing: -0.3px;
}

/* Actions: Sort & Pill toggles */
.avg-hub-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.avg-sort-select-box {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 600;
    color: #64748b;
}

.avg-select-input {
    border: 1px solid var(--avg-border-color);
    background: #ffffff;
    padding: 5px 10px;
    border-radius: 6px;
    font-size: 12px;
    color: #1e293b;
    cursor: pointer;
    outline: none;
    font-weight: 600;
}

.avg-select-input:focus {
    border-color: var(--avg-gold);
}

.avg-view-pill-group {
    display: inline-flex;
    background: #f1f5f9;
    padding: 3px;
    border-radius: 999px;
    border: 1px solid var(--avg-border-color);
}

.avg-pill-btn {
    border: none;
    background: transparent;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    color: #64748b;
    cursor: pointer;
    transition: all 0.2s ease;
}

.avg-pill-btn:hover {
    color: var(--avg-gold);
}

.avg-pill-btn.active {
    background: var(--avg-gold);
    color: #ffffff;
    box-shadow: 0 2px 6px rgba(204, 130, 46, 0.35);
}

/* 4-Column Grid */
.avg-hub-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* Card Styling */
.avg-hub-card {
    background: var(--avg-card-bg);
    border: 1px solid var(--avg-border-color);
    border-radius: var(--avg-radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease, border-color 0.25s ease;
    cursor: pointer;
    position: relative;
}

.avg-hub-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 14px 30px var(--avg-gold-glow);
    border-color: rgba(204, 130, 46, 0.4);
}

/* Media Thumbnail Frame */
.avg-media-frame {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 10;
    background: #0f172a;
    overflow: hidden;
}

.avg-media-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.45s ease;
}

.avg-hub-card:hover .avg-media-frame img {
    transform: scale(1.06);
}

.avg-placeholder-banner {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f8fafc;
}

/* Floating Glassmorphic Date Badge */
.avg-floating-date {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(15, 23, 42, 0.72);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: #ffffff;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.25);
    z-index: 2;
}

/* Play Hover Overlay */
.avg-play-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.25s ease;
    z-index: 1;
}

.avg-hub-card:hover .avg-play-backdrop {
    background: rgba(15, 23, 42, 0.4);
}

.avg-pulsing-play {
    width: 48px;
    height: 48px;
    background: #ffffff5e;
    color: var(--avg-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
    transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.avg-pulsing-play svg {
    width: 18px;
    height: 18px;
    margin-left: 3px;
}

.avg-hub-card:hover .avg-pulsing-play {
    transform: scale(1.15);
    background: var(--avg-gold);
    color: #ffffff;
    box-shadow: 0 0 20px var(--avg-gold);
}

/* Details */
.avg-card-details {
    padding: 16px 18px 18px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.avg-card-meta-line {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11.5px;
    color: #64748b;
    margin-bottom: 8px;
}

.avg-tag-label {
    background: var(--avg-gold-bg);
    color: var(--avg-gold);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 10px;
    padding: 2px 7px;
    border-radius: 4px;
}

.avg-meta-dot {
    color: #cbd5e1;
}

.avg-card-headline {
    font-size: 15px;
    font-weight: 700;
    color: var(--avg-text-main);
    line-height: 1.4;
    margin: 0 0 10px 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.avg-card-excerpt {
    font-size: 12.5px;
    color: var(--avg-text-muted);
    line-height: 1.6;
    text-align: justify;
    margin-bottom: 14px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 6; /* Even baseline across 4 columns */
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.avg-card-excerpt p {
    margin: 0;
}

.avg-card-foot {
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px dashed #f1f5f9;
}

.avg-watch-btn {
    font-size: 12px;
    font-weight: 700;
    color: var(--avg-gold);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.2s ease;
}

.avg-hub-card:hover .avg-watch-btn {
    gap: 7px;
}

/* Pagination */
.avg-hub-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.avg-page-btn {
    min-width: 38px;
    height: 38px;
    padding: 0 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    border: 1px solid var(--avg-border-color);
    color: #475569;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.avg-page-btn:hover {
    border-color: var(--avg-gold);
    color: var(--avg-gold);
    background: #fffaf4;
}

.avg-page-btn.active {
    background: var(--avg-gold);
    border-color: var(--avg-gold);
    color: #ffffff;
    box-shadow: 0 2px 6px rgba(204, 130, 46, 0.35);
}

.avg-page-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

/* Lightbox Modal */
.avg-hub-modal {
    position: fixed;
    inset: 0;
    z-index: 999999;
    display: none;
    align-items: center;
    justify-content: center;
}

.avg-hub-modal.active {
    display: flex;
}

.avg-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(10, 15, 28, 0.9);
    backdrop-filter: blur(10px);
}

.avg-modal-dialog {
    position: relative;
    z-index: 10;
    width: 880px;
    max-width: 92vw;
    background: #0f172a;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.65);
}

.avg-modal-close {
    position: absolute;
    top: -46px;
    right: 0;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: #fff;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
}

.avg-modal-close:hover {
    background: var(--avg-gold);
}

.avg-video-responsive {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    background: #000;
}

.avg-video-responsive iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.avg-modal-caption {
    padding: 14px 20px;
    background: #1e293b;
}

.avg-modal-caption h4 {
    margin: 0;
    color: #ffffff;
    font-size: 15px;
    font-weight: 600;
}

.avg-empty-box {
    background: #fffaf4;
    border-left: 3px solid var(--avg-gold);
    padding: 16px 20px;
    color: #64748b;
    border-radius: 4px;
}

/* Responsive */
@media (max-width: 1100px) {
    .avg-hub-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .avg-hub-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .avg-card-excerpt {
        -webkit-line-clamp: 4;
    }
}

@media (max-width: 520px) {
    .avg-hub-grid {
        grid-template-columns: 1fr;
    }
    .avg-hub-header {
        flex-direction: column;
        align-items: flex-start;
    }
}