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

:root {
    --color-bg: #0f0f0f;
    --color-bg-secondary: #1a1a1a;
    --color-text: #e0e0e0;
    --color-text-muted: #a0a0a0;
    --color-accent: #00d4ff;
    --color-accent-hover: #00a8cc;
    --color-border: #333;
    --color-success: #4caf50;
    --color-error: #f44336;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --border-radius: 8px;
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
}

body.theme-light {
    --color-bg: #f6f7fb;
    --color-bg-secondary: #ffffff;
    --color-text: #1a1f2a;
    --color-text-muted: #697089;
    --color-accent: #0066ff;
    --color-accent-hover: #0047b3;
    --color-border: #dbe1f4;
    --color-success: #2e8b57;
    --color-error: #c62828;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
}

/* Header & Search */
.header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto var(--spacing-lg);
}

.gallery-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
}

.search-input {
    width: 100%;
    max-width: 600px;
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.1);
}

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

/* Filters */
.mobile-filters-toggle {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 1400px;
    margin: 0 auto var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

.mobile-filters-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.mobile-filters-toggle.has-active {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filters-toggle-icon {
    display: inline-flex;
    align-items: center;
    transition: transform var(--transition-fast);
}

.mobile-filters-toggle[aria-expanded="true"] .filters-toggle-icon {
    transform: rotate(180deg);
}

.filters-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
}

.filter-dropdowns {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.filter-dropdown {
    position: relative;
    flex: 1 1 220px;
    min-width: 200px;
}

.filter-dropdown-trigger {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-text);
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

.filter-dropdown-trigger:hover,
.filter-dropdown.open .filter-dropdown-trigger {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-dropdown-count {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.filter-dropdown-panel {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    width: 360px;
    max-width: calc(100vw - 20px);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    box-shadow: 0 12px 36px rgba(15, 23, 42, 0.18);
    padding: var(--spacing-md);
    display: none;
    z-index: 20;
}

.filter-dropdown.open .filter-dropdown-panel {
    display: block;
}

.filter-dropdown-panel .filter-group {
    flex-direction: column;
    align-items: flex-start;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.filter-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.filter-chips {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-chip {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.filter-chip.color-chip {
    position: relative;
    padding-left: calc(var(--spacing-md) * 2 + 0.6rem);
    border-color: var(--chip-color, var(--color-border));
}

.filter-chip.color-chip::before {
    content: '';
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    width: 0.9rem;
    height: 0.9rem;
    border-radius: 999px;
    background: var(--chip-color, var(--color-accent));
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.filter-chip:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-chip.active {
    background-color: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

.filter-chip.color-chip:hover {
    border-color: var(--chip-color, var(--color-accent));
    color: var(--chip-color, var(--color-accent));
}

.filter-chip.color-chip.active {
    background-color: var(--chip-color, var(--color-accent));
    color: #fff;
    border-color: var(--chip-color, var(--color-accent));
}

.filters-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.theme-toggle-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    background-color: transparent;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

@media (max-width: 768px) {
    .mobile-filters-toggle {
        display: flex;
    }

    .filters-container {
        display: none;
        gap: 0.6rem;
        padding: var(--spacing-md);
        border-radius: var(--border-radius);
        background-color: var(--color-bg-secondary);
        margin-top: 0;
    }

    .filters-container.is-open {
        display: flex;
    }

    .filter-dropdowns {
        flex-direction: column;
    }

    .filter-dropdown {
        flex: 1 1 auto;
    }

    .filter-dropdown-panel {
        position: static;
        width: 100%;
        max-width: 100%;
        box-shadow: none;
        border: none;
        padding: var(--spacing-sm) 0 0;
    }

    .filter-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.35rem;
    }

    .filter-chips {
        gap: 0.35rem;
    }

    .filter-chip {
        font-size: 0.75rem;
        padding: 0.35rem 0.7rem;
        border-radius: 16px;
    }

    .filter-chip.color-chip {
        padding-left: calc(0.7rem + 1.2rem);
    }

    .filter-chip.color-chip::before {
        width: 0.75rem;
        height: 0.75rem;
        left: 0.45rem;
    }

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

    .filters-actions {
        flex-direction: column;
        align-items: stretch;
    }
}

.clear-filters-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: transparent;
    border: 1px solid var(--color-error);
    color: var(--color-error);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.clear-filters-btn:hover {
    background-color: var(--color-error);
    color: #fff;
}

/* Gallery Container & Grid */
.gallery-container {
    max-width: 1400px;
    margin: var(--spacing-lg) auto;
    padding: 0 var(--spacing-lg);
    min-height: 60vh;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    animation: fadeIn 0.4s ease;
}

@media (max-width: 1024px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}

@media (max-width: 640px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--spacing-md);
    }
}

/* Gallery Card */
.gallery-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.gallery-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.2);
}

.gallery-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background-color: var(--color-bg);
    transition: transform var(--transition-normal);
}

.gallery-card:hover .gallery-card-image {
    transform: scale(1.05);
}

.gallery-card-content {
    padding: var(--spacing-md);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.gallery-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent);
    word-break: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.gallery-card-meta {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.gallery-card-tags {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.tag {
    display: inline-block;
    padding: 2px 8px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    font-size: 0.7rem;
    color: var(--color-text-muted);
    word-break: break-word;
}

.tag.ai-tag {
    background-color: rgba(0, 212, 255, 0.1);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Loading Indicator */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    color: var(--color-text-muted);
}

.spinner {
    border: 3px solid var(--color-border);
    border-top: 3px solid var(--color-accent);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Error Message */
.error-message {
    display: none;
    max-width: 1400px;
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-lg);
    background-color: rgba(244, 67, 54, 0.1);
    border: 1px solid var(--color-error);
    border-radius: var(--border-radius);
    color: #ffcdd2;
    text-align: center;
}

.error-message.show {
    display: block;
}

/* Pagination */
.pagination-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) auto;
    padding: var(--spacing-lg);
    max-width: 1400px;
}

.pagination-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.pagination-btn:hover:not(:disabled) {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: rgba(0, 212, 255, 0.05);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.page-info {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    min-width: 120px;
    text-align: center;
}

/* Modal/Lightbox */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
}

.modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-text);
    transition: color var(--transition-fast);
    z-index: 1001;
}

.modal-close:hover {
    color: var(--color-accent);
}

.modal-content {
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: var(--border-radius);
}

.modal-info {
    max-width: 90vw;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: var(--border-radius);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Empty State */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-lg) * 2;
    color: var(--color-text-muted);
}

.empty-state h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-md);
    }

    .gallery-title {
        font-size: 1.5rem;
    }

    .filters-container {
        gap: var(--spacing-sm);
    }

    .filter-group {
        gap: var(--spacing-sm);
    }

    .gallery-container {
        margin: var(--spacing-md) auto;
        padding: 0 var(--spacing-md);
    }

    .pagination-container {
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    .pagination-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.85rem;
    }
}