/* ============================================
   Gem & Mineral Collection — Public Gallery
   Premium dark gallery design
   ============================================ */

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

:root {
    --color-bg: #0a0a0c;
    --color-surface: #141418;
    --color-surface-2: #1c1c22;
    --color-surface-hover: #22222a;
    --color-border: #2a2a35;
    --color-text: #eaeaf0;
    --color-text-secondary: #a0a0b0;
    --color-text-muted: #6a6a7a;
    --color-accent: #8b5cf6;
    --color-accent-glow: rgba(139, 92, 246, 0.3);
    --color-accent-hover: #a78bfa;
    --color-accent-subtle: rgba(139, 92, 246, 0.08);
    --color-link: #a78bfa;
    --color-gold: #d4a853;
    --font-display: 'Georgia', 'Times New Roman', serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
    --radius: 8px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --container-width: 1360px;
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.5), 0 0 30px rgba(139, 92, 246, 0.08);
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(139, 92, 246, 0.04) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 50%, rgba(212, 168, 83, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

a { color: var(--color-link); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent-hover); }
img { max-width: 100%; height: auto; display: block; }

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* Header */
.site-header {
    background: rgba(10, 10, 12, 0.85);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    height: 64px;
}

.site-logo { text-decoration: none; color: var(--color-text); }
.site-logo:hover { color: var(--color-text); }

.site-logo h1 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.site-nav { display: flex; align-items: center; gap: 1.25rem; }

.site-nav .nav-link {
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.875rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    padding: 0.4rem 0;
    position: relative;
    transition: color var(--transition-fast);
}

.site-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform var(--transition-smooth);
}

.site-nav .nav-link:hover { color: var(--color-text); }
.site-nav .nav-link:hover::after { transform: scaleX(1); }

.search-form { display: flex; position: relative; }

.search-input {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--color-text);
    padding: 0.55rem 1rem;
    padding-right: 3rem;
    border-radius: 100px;
    font-size: 0.875rem;
    width: 240px;
    transition: all var(--transition-smooth);
    font-family: var(--font-body);
}

.search-input::placeholder { color: var(--color-text-muted); }

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
    background: rgba(139, 92, 246, 0.06);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.1);
    width: 280px;
}

.search-btn {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-accent);
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 0;
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn::before { content: '⌕'; font-size: 1rem; }
.search-btn:hover { background: var(--color-accent-hover); }

/* Main */
.site-main {
    padding: 2.5rem 0 4rem;
    min-height: calc(100vh - 140px);
}

/* Gallery Layout */
.gallery-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 2.5rem;
}

/* Mobile filter toggle button — hidden on desktop */
.filter-toggle-btn {
    display: none;
    width: 100%;
    padding: 0.7rem 1rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    font-family: var(--font-body);
    cursor: pointer;
    text-align: left;
    transition: all var(--transition-fast);
    margin-bottom: 0.5rem;
}

.filter-toggle-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
}

.filter-toggle-icon {
    margin-right: 0.4rem;
}

@media (max-width: 900px) {
    .gallery-layout { grid-template-columns: 1fr; }
    .filter-toggle-btn { display: block; }
    .filter-sidebar {
        display: none;
        position: static;
    }
    .filter-sidebar.open {
        display: block;
    }
}

/* Filter Sidebar */
.filter-sidebar {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    height: fit-content;
    position: sticky;
    top: 80px;
}

.filter-sidebar h3 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    margin-bottom: 1.25rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.filter-group { margin-bottom: 1.25rem; }

.filter-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 0.35rem;
    letter-spacing: 0.02em;
}

.filter-select, .filter-input {
    width: 100%;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    padding: 0.45rem 0.6rem;
    border-radius: var(--radius);
    font-size: 0.8rem;
    transition: border-color var(--transition-fast);
    font-family: var(--font-body);
}

.filter-select:focus, .filter-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.filter-checkboxes {
    max-height: 140px;
    overflow-y: auto;
    padding-right: 4px;
}

.filter-checkboxes::-webkit-scrollbar { width: 4px; }
.filter-checkboxes::-webkit-scrollbar-track { background: transparent; }
.filter-checkboxes::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 4px; }

.filter-checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem !important;
    color: var(--color-text-secondary) !important;
    font-weight: 400 !important;
    padding: 0.2rem 0;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.filter-checkbox-label:hover { color: var(--color-text) !important; }

.filter-btn { width: 100%; margin-top: 0.5rem; text-align: center; }

/* Gallery Grid */
.gallery-content { min-width: 0; }

.results-count {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    margin-bottom: 1.25rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.5rem;
}

@media (max-width: 500px) {
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
}

.gallery-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-smooth);
    text-decoration: none;
    color: var(--color-text);
    position: relative;
    animation: fadeInUp 0.5s ease both;
}

.gallery-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    opacity: 0;
    transition: opacity var(--transition-smooth);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(212, 168, 83, 0.05) 100%);
    z-index: 1;
    pointer-events: none;
}

.gallery-card:hover {
    transform: translateY(-6px);
    border-color: rgba(139, 92, 246, 0.3);
    box-shadow: var(--shadow-card-hover);
}

.gallery-card:hover::before { opacity: 1; }

.gallery-card:nth-child(1) { animation-delay: 0.02s; }
.gallery-card:nth-child(2) { animation-delay: 0.06s; }
.gallery-card:nth-child(3) { animation-delay: 0.10s; }
.gallery-card:nth-child(4) { animation-delay: 0.14s; }
.gallery-card:nth-child(5) { animation-delay: 0.18s; }
.gallery-card:nth-child(6) { animation-delay: 0.22s; }
.gallery-card:nth-child(7) { animation-delay: 0.26s; }
.gallery-card:nth-child(8) { animation-delay: 0.30s; }
.gallery-card:nth-child(9) { animation-delay: 0.34s; }
.gallery-card:nth-child(10) { animation-delay: 0.38s; }
.gallery-card:nth-child(11) { animation-delay: 0.42s; }
.gallery-card:nth-child(12) { animation-delay: 0.46s; }

.gallery-card-image {
    aspect-ratio: 1;
    overflow: hidden;
    background: var(--color-bg);
}

.gallery-card-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.gallery-card:hover .gallery-card-image img {
    transform: scale(1.08);
}

.gallery-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-bg) 100%);
    opacity: 0.5;
}

.gallery-card-info {
    padding: 0.85rem 1rem;
    position: relative;
    z-index: 2;
}

.gallery-card-info h3 {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Specimen Detail */
.specimen-detail { max-width: 1200px; margin: 0 auto; }

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.back-link:hover { color: var(--color-accent); }

.detail-layout {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: start;
    animation: fadeInUp 0.5s ease both;
}

@media (max-width: 900px) {
    .detail-layout { grid-template-columns: 1fr; gap: 2rem; }
}

.detail-main-photo {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.detail-main-photo img {
    width: 100%;
    max-height: 650px;
    object-fit: contain;
    background: #000;
    cursor: zoom-in;
    transition: opacity 0.3s ease;
}

.photo-caption {
    padding: 0.85rem 1.25rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-style: italic;
    border-top: 1px solid var(--color-border);
}

.detail-thumbs {
    display: flex;
    gap: 0.6rem;
    margin-top: 0.85rem;
    flex-wrap: wrap;
}

.thumb-btn {
    width: 72px;
    height: 72px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    padding: 0;
    background: var(--color-surface);
    transition: all var(--transition-fast);
    position: relative;
}

.thumb-btn img { width: 100%; height: 100%; object-fit: cover; }

.thumb-btn.active {
    border-color: var(--color-accent);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.3);
}

.thumb-btn:hover { border-color: var(--color-accent); }

.detail-no-photo {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 4rem;
    text-align: center;
    font-size: 5rem;
}

.detail-no-photo p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 0.75rem;
}

.detail-info h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--color-text) 30%, var(--color-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
}

.detail-description {
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
    font-size: 0.95rem;
}

.detail-fields {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.detail-fields tbody tr { transition: background var(--transition-fast); }
.detail-fields tbody tr:hover { background: var(--color-accent-subtle); }

.detail-fields th, .detail-fields td {
    padding: 0.7rem 0.75rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.875rem;
    vertical-align: top;
}

.detail-fields th {
    text-align: left;
    color: var(--color-text-muted);
    font-weight: 500;
    width: 38%;
    padding-right: 1.5rem;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.detail-fields td a { word-break: break-all; }

.color-swatch {
    display: inline-block;
    width: 16px;
    height: 16px;
    border-radius: 4px;
    vertical-align: middle;
    margin-right: 0.35rem;
    border: 1px solid rgba(255,255,255,0.1);
}

/* Lightbox */
.lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(10px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.lightbox-overlay.active { opacity: 1; visibility: visible; }

.lightbox-overlay img {
    max-width: 92vw;
    max-height: 92vh;
    object-fit: contain;
    border-radius: var(--radius);
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.5);
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.lightbox-overlay.active img { transform: scale(1); }

.lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.lightbox-close:hover { background: rgba(255,255,255,0.2); transform: rotate(90deg); }

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.lightbox-nav:hover { background: rgba(255,255,255,0.15); }

.lightbox-prev { left: 1.5rem; }
.lightbox-next { right: 1.5rem; }

.lightbox-counter {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.5);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
}

/* Search */
.site-main h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

/* Pagination */
.pagination {
    display: flex;
    gap: 0.4rem;
    justify-content: center;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.page-link {
    padding: 0.5rem 0.85rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text-muted);
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.page-link:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent);
    color: var(--color-text);
}

.page-link.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.3);
}

.page-ellipsis { padding: 0.5rem 0.25rem; color: var(--color-text-muted); }

/* Empty & Error States */
.empty-state {
    text-align: center;
    color: var(--color-text-muted);
    padding: 4rem 1rem;
    font-size: 1rem;
}

.empty-state a { color: var(--color-accent); }

.error-page { text-align: center; padding: 6rem 1rem; }

.error-page h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.error-page p {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1.25rem;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    font-family: var(--font-body);
}

.btn-primary {
    background: var(--color-accent);
    color: white;
    box-shadow: 0 2px 10px rgba(139, 92, 246, 0.2);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    color: white;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.35);
    transform: translateY(-1px);
}

.btn-sm { padding: 0.4rem 0.85rem; font-size: 0.8rem; }

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.8rem;
    letter-spacing: 0.03em;
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }

::selection { background: rgba(139, 92, 246, 0.3); color: var(--color-text); }

/* Animations */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
    .container { padding: 0 1.25rem; }
    .site-header .container { height: auto; padding: 0.75rem 1.25rem; }
    .site-logo h1 { font-size: 1rem; }
    .search-input { width: 160px; }
    .search-input:focus { width: 180px; }
    .detail-info h1 { font-size: 1.5rem; }
    .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
    .gallery-card-info { padding: 0.6rem 0.75rem; }
    .gallery-card-info h3 { font-size: 0.8rem; }
}

@media (max-width: 400px) {
    .gallery-grid { grid-template-columns: 1fr; }
}