/* Photo Page - SELAB@HKNU */

.photo-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 40px;
    align-items: start;
}
.photo-sidebar .sidebar-box {
    position: sticky;
    top: 96px;
}

.photo-page .photo-content .section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-border);
}
.photo-page .photo-content .section-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0;
    color: var(--color-text-dark);
    display: flex;
    align-items: center;
    gap: 8px;
}
.count-badge {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-secondary);
    background: #e2e8f0;
    padding: 4px 10px;
    border-radius: 99px;
}

.photo-groups {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.photo-group {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.photo-group__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 16px;
}

.photo-group__heading {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.photo-group__title {
    font-size: 1.3rem;
    font-weight: 800;
    margin: 0;
    color: var(--color-text-main);
    line-height: 1.3;
}

.photo-group__date {
    font-size: 0.9rem;
    color: var(--color-secondary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.photo-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
}
.photo-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }

.photo-card__media {
    position: relative;
    display: block;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: var(--color-light-bg);
}
.photo-card__media::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 0;
    background:
        linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.55) 48%, transparent 100%),
        linear-gradient(135deg, #e8eef6 0%, #f5f8fc 100%);
    background-size: 220% 100%, 100% 100%;
    animation: photo-skeleton 1.4s ease-in-out infinite;
    opacity: 1;
    transition: opacity 0.24s ease;
}
.photo-card__media.is-loaded::before {
    opacity: 0;
    animation: none;
}
.photo-card__img {
    position: relative;
    z-index: 1;
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.22s ease, transform 0.35s ease;
}
.photo-card__img.loaded { opacity: 1; }
.photo-card:hover .photo-card__img { transform: scale(1.05); }
.photo-card__overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    background: rgba(0,0,0,0.3);
    opacity: 0;
    transition: opacity 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.photo-card:hover .photo-card__overlay { opacity: 1; }
.zoom-icon {
    color: white;
    font-size: 1.5rem;
    background: rgba(255,255,255,0.2);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}
.photo-card__media:focus-visible,
.filter-item:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.18);
}

.photo-card__body { padding: 20px; display: flex; flex-direction: column; gap: 8px; }
.photo-card__title { font-size: 1.1rem; font-weight: 700; margin: 0; color: var(--color-text-main); line-height: 1.3; }
.photo-card__date { font-size: 0.85rem; color: var(--color-secondary); display: flex; align-items: center; gap: 6px; }
.photo-card__text {
    margin-top: 8px;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--color-secondary);
    max-height: 80px;
    overflow-y: auto;
    padding-right: 4px;
}
.custom-scroll::-webkit-scrollbar { width: 4px; }
.custom-scroll::-webkit-scrollbar-track { background: transparent; }
.custom-scroll::-webkit-scrollbar-thumb { background: var(--color-divider); border-radius: 4px; }
.custom-scroll:hover::-webkit-scrollbar-thumb { background: var(--color-muted, #94a3b8); }

@keyframes photo-skeleton {
    0% { background-position: 120% 0, 0 0; }
    100% { background-position: -120% 0, 0 0; }
}

@media (max-width: 992px) {
    .photo-layout { grid-template-columns: 1fr; }
    .photo-content { order: 1; }
    .photo-sidebar { order: 2; margin-top: 40px; }
    .photo-sidebar .sidebar-box { position: static; }
    .photo-group__header { flex-direction: column; align-items: flex-start; }
    .photo-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 576px) {
    .photo-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    .photo-card,
    .photo-card__media::before,
    .photo-card__img,
    .photo-card__overlay {
        transition: none !important;
        animation: none !important;
    }

    .photo-card:hover {
        transform: none;
    }
}