:root {
    --bg-color: #f8fafc; /* Gris perlado ultra claro */
    --text-main: #0f172a;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius: 12px;
    --transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.gallery-header {
    text-align: center;
    padding: 6rem 1rem 3rem;
    animation: fadeInDown 0.8s ease-out forwards;
}

.gallery-header h1 {
    font-size: 3rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
}

.gallery-header .subtitle {
    color: var(--text-muted);
    font-size: 1.15rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.gallery-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem 5rem;
}

/* Category Filters */
.category-filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 4rem;
    animation: fadeIn 1s ease-out 0.2s forwards;
    opacity: 0;
}

.filter-btn {
    background: transparent;
    border: 1px solid #cbd5e1;
    color: var(--text-muted);
    padding: 0.6rem 1.5rem;
    border-radius: 9999px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--text-main);
    color: var(--text-main);
    background: white;
}

.filter-btn.active {
    background-color: var(--text-main);
    color: #fff;
    border-color: var(--text-main);
    box-shadow: 0 4px 14px 0 rgba(15, 23, 42, 0.2);
}

/* Photo Grid */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    grid-auto-rows: 280px;
    grid-auto-flow: dense;
}

.photo-item {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    background-color: #e2e8f0;
    opacity: 0; /* Let animation take over */
}

/* Mosaic sizing logic */
.photo-item.wide { grid-column: span 2; }
.photo-item.tall { grid-row: span 2; }
.photo-item.huge { grid-column: span 2; grid-row: span 2; }

.photo-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px) scale(1.02);
    z-index: 10;
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.photo-item:hover img {
    transform: scale(1.08);
}

/* Overlay & Caption */
.photo-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition);
    display: flex;
    align-items: flex-end;
    padding: 1.5rem;
}

.photo-item:hover .photo-overlay {
    opacity: 1;
}

.photo-overlay .info {
    color: white;
    transform: translateY(15px);
    transition: var(--transition);
}

.photo-item:hover .photo-overlay .info {
    transform: translateY(0);
}

.photo-overlay h3 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.photo-overlay span {
    font-size: 0.8rem;
    opacity: 0.9;
    background-color: rgba(255,255,255,0.2);
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    backdrop-filter: blur(4px);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: inline-block;
}

/* Lightbox Premium Glassmorphism */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    /* Glassmorphism over white/light gray background */
    background-color: rgba(248, 250, 252, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 85vh;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius);
    overflow: hidden;
    background: #000; /* Fondo negro solo detrás de la foto si es de proporción rara */
}

.lightbox-img {
    max-width: 100%;
    max-height: 85vh;
    display: block;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.close-lightbox {
    position: absolute;
    top: 2rem;
    right: 3rem;
    background: transparent;
    border: none;
    font-size: 3.5rem;
    color: var(--text-main);
    cursor: pointer;
    line-height: 0.5;
    z-index: 1001;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.close-lightbox:hover {
    transform: rotate(90deg) scale(1.2);
}

.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(4px);
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 1001;
}

.nav-btn:hover {
    background: white;
    transform: translateY(-50%) scale(1.1);
}

.prev-btn { left: 3rem; }
.next-btn { right: 3rem; }

.lightbox-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: white;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 500;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

.fadeIn-elem {
    animation: fadeIn 0.6s cubic-bezier(0.165, 0.84, 0.44, 1) forwards;
}

/* Responsividad */
@media (max-width: 768px) {
    .gallery-header { padding: 4rem 1rem 2rem; }
    .gallery-header h1 { font-size: 2.2rem; }
    
    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(100%, 1fr));
        grid-auto-rows: 250px;
        gap: 1rem;
    }
    
    .photo-item.wide, .photo-item.tall, .photo-item.huge {
        grid-column: span 1;
        grid-row: span 1;
    }
    
    .nav-btn { width: 3rem; height: 3rem; font-size: 1.2rem; }
    .prev-btn { left: 1rem; }
    .next-btn { right: 1rem; }
    .close-lightbox { top: 1rem; right: 1.5rem; font-size: 3rem; }
}

/* Central Settings Button */
.btn-central-settings {
    margin-top: 1.5rem;
    padding: 0.8rem 1.8rem;
    background: var(--card-bg);
    color: var(--text-main);
    border: 1px solid #cbd5e1;
    border-radius: 9999px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}
.btn-central-settings:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--text-main);
}

/* Admin Modal */
.admin-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}
.admin-modal.active { opacity: 1; pointer-events: auto; }

.admin-content {
    background: var(--card-bg);
    width: 95%; max-width: 650px;
    height: 90vh;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.admin-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.25rem 1.5rem; border-bottom: 1px solid #e2e8f0;
}
.admin-header h2 { font-size: 1.4rem; font-weight: 600; margin: 0; }
.close-admin { background: transparent; border: none; font-size: 2rem; cursor: pointer; color: var(--text-muted); line-height: 1; }
.close-admin:hover { color: var(--text-main); }

.admin-tabs { display: flex; background: #f1f5f9; border-bottom: 1px solid #e2e8f0; }
.tab-btn {
    flex: 1; padding: 1rem; font-size: 1rem; font-weight: 500;
    background: transparent; border: none; cursor: pointer;
    border-bottom: 3px solid transparent; color: var(--text-muted); transition: 0.2s;
}
.tab-btn:hover { color: var(--text-main); }
.tab-btn.active { color: var(--text-main); border-bottom-color: var(--text-main); background: white; }

.tab-pane { display: none; padding: 1.5rem; overflow-y: auto; flex: 1; }
.tab-pane.active { display: block; }

.admin-form { display: flex; flex-direction: column; gap: 0.8rem; margin-bottom: 2rem; background: #f8fafc; padding: 1.25rem; border-radius: var(--radius); border: 1px solid #e2e8f0; }
.admin-form input, .admin-form select { padding: 0.75rem; border: 1px solid #cbd5e1; border-radius: 6px; font-family: inherit; width: 100%; transition: border-color 0.2s;}
.admin-form input:focus { outline: none; border-color: var(--text-main); }
.btn-primary { background: var(--text-main); color: white; padding: 0.75rem; border: none; border-radius: 6px; font-weight: 600; cursor: pointer; margin-top: 0.5rem;}
.btn-primary:hover { background: #334155; }

.admin-list { display: flex; flex-direction: column; gap: 0.5rem; }
.list-item { display: flex; justify-content: space-between; align-items: center; padding: 0.75rem 1rem; background: white; border: 1px solid #e2e8f0; border-radius: 6px; box-shadow: var(--shadow-sm); }
.list-item img { width: 45px; height: 45px; object-fit: cover; border-radius: 6px; margin-right: 1rem; }
.list-item-info { flex: 1; display: flex; align-items: center; }
.list-item-title { font-weight: 500; font-size: 0.95rem; }
.list-item-category { font-size: 0.8rem; color: var(--text-muted); margin-left: 0.5rem; background: #e2e8f0; padding: 0.1rem 0.5rem; border-radius: 4px; }
.item-actions { display: flex; gap: 0.5rem; }

.btn-danger { background: #fee2e2; color: #ef4444; border: 1px solid #fca5a5; padding: 0.4rem 0.6rem; border-radius: 4px; cursor: pointer; font-size: 0.85rem;}
.btn-danger:hover { background: #ef4444; color: white; }
.btn-move { background: #f1f5f9; color: var(--text-muted); border: 1px solid #cbd5e1; padding: 0.4rem 0.6rem; border-radius: 4px; cursor: pointer;}
.btn-move:hover { background: #e2e8f0; color: var(--text-main); }

.admin-footer { padding: 1.25rem 1.5rem; border-top: 1px solid #e2e8f0; text-align: right; background: #f8fafc; }
.btn-success { background: #0f172a; color: white; padding: 0.75rem 1.5rem; border: none; border-radius: 6px; font-weight: 600; cursor: pointer; font-size: 1rem; width: 100%;}
.drag-hint { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.75rem; font-weight: 500;}