:root {
      --primary: #3A1B5E;
      --primary-dark: #2B1447;
      --primary-light: #6B3FA0;
      --accent: #8B5FCF;
      --success: #10b981;
      --warning: #f59e0b;
      --danger: #ef4444;
      --bg-primary: #0a0a0a;
      --bg-secondary: #121212;
      --bg-tertiary: #1a1a1a;
      --bg-card: #1e1e1e;
      --bg-input: #262626;
      --text-primary: #ffffff;
      --text-secondary: #a3a3a3;
      --text-muted: #737373;
      --text-link: #8B5FCF;
      --border: rgba(255, 255, 255, 0.08);
      --border-hover: rgba(58, 27, 94, 0.4);
      --shadow: rgba(0, 0, 0, 0.6);
      --shadow-light: rgba(0, 0, 0, 0.3);
      --sidebar-width: 320px;
      --transition: all 0.2s ease-in-out;
    }

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

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--bg-primary);
      color: var(--text-primary);
      overflow-x: hidden;
      line-height: 1.6;
      min-height: 100vh;
    }

    /* ───────── LAYOUT ───────── */
    .app-container {
      display: flex;
      min-height: 100vh;
    }

    /* ───────── SIDEBAR ───────── */
    .sidebar {
      width: var(--sidebar-width);
      background: var(--bg-tertiary);
      border-right: 1px solid var(--border);
      position: fixed;
      height: 100vh;
      overflow-y: auto;
      z-index: 100;
      transition: var(--transition);
    }

    .sidebar-header {
      padding: 2rem 1.5rem;
      border-bottom: 1px solid var(--border);
      text-align: center;
      background: var(--bg-secondary);
      position: relative;
    }

    .logo-img {
      max-width: 200px;
      height: auto;
      margin-bottom: 1rem;
      display: inline-block;
    }

    .logo {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }

    .logo-subtitle {
      font-size: 0.875rem;
      color: var(--text-muted);
      font-weight: 400;
    }

    .sidebar-content {
      padding: 1.5rem 1rem;
    }

    /* ───────── SEARCH BAR ───────── */
    .search-container {
      position: relative;
      margin-bottom: 1rem;
    }

    .search-input {
      width: 100%;
      background: var(--bg-input);
      border: 1px solid var(--border);
      color: var(--text-primary);
      padding: 0.75rem 2.5rem 0.75rem 1rem;
      border-radius: 0.5rem;
      font-size: 0.875rem;
      transition: var(--transition);
    }

    .search-input:focus {
      outline: none;
      border-color: var(--primary);
      background: var(--bg-card);
    }

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

    .search-icon {
      position: absolute;
      right: 1rem;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
      pointer-events: none;
    }

    /* ───────── VIEW ALL BUTTON ───────── */
    .view-all-btn {
      width: 100%;
      background: var(--primary);
      border: none;
      color: white;
      padding: 0.75rem 1rem;
      border-radius: 0.5rem;
      font-size: 0.875rem;
      font-weight: 500;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      align-items: center;
      gap: 0.75rem;
      justify-content: center;
      margin-bottom: 1.5rem;
    }

    .view-all-btn:hover {
      background: var(--primary-light);
      transform: translateY(-1px);
    }

    .section-title {
      font-size: 0.6875rem;
      font-weight: 600;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.02em;
      margin: 1.5rem 0 0.5rem;
      padding: 0 0.5rem;
    }

    .categories-list {
      list-style: none;
    }

    .category-item {
      margin-bottom: 0.25rem;
    }

    .category-btn {
      width: 100%;
      background: transparent;
      border: none;
      color: var(--text-muted);
      padding: 0.5rem 0.75rem;
      border-radius: 0.25rem;
      font-size: 0.875rem;
      font-weight: 500;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      align-items: center;
      gap: 0.75rem;
      text-align: left;
    }

    .category-btn:hover {
      background: var(--bg-secondary);
      color: var(--text-secondary);
    }

    .category-btn.active {
      background: var(--primary);
      color: white;
    }

    .category-icon {
      width: 1.25rem;
      text-align: center;
      font-size: 1.1rem;
    }

    .category-icon {
      width: 1.25rem;
      text-align: center;
      font-size: 1rem;
    }

    .category-count {
      margin-left: auto;
      background: var(--bg-input);
      color: var(--text-muted);
      padding: 0.125rem 0.5rem;
      border-radius: 0.75rem;
      font-size: 0.6875rem;
      font-weight: 600;
      min-width: 1.5rem;
      text-align: center;
    }

    .active .category-count {
      background: rgba(255, 255, 255, 0.2);
      color: white;
    }

    /* ───────── SOUS-CATÉGORIES ───────── */
    .subcategory-list {
      margin-top: 0.25rem;
      margin-left: 1.5rem;
      border-left: 2px solid var(--border);
      padding-left: 0.75rem;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.2s ease;
    }

    .subcategory-list.expanded {
      max-height: 500px;
    }

    .subcategory-btn {
      width: 100%;
      background: none;
      border: none;
      color: var(--text-muted);
      padding: 0.375rem 0.5rem;
      border-radius: 0.25rem;
      font-size: 0.8125rem;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      text-align: left;
      margin-bottom: 0.125rem;
    }

    .subcategory-btn:hover {
      background: var(--bg-secondary);
      color: var(--text-secondary);
    }

    .subcategory-btn.active {
      background: rgba(88, 101, 242, 0.15);
      color: var(--primary-light);
    }

    .expand-icon {
      margin-left: auto;
      transition: transform 0.2s ease;
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    .category-btn.expanded .expand-icon {
      transform: rotate(180deg);
    }

    /* ───────── MAIN CONTENT ───────── */
    .main-content {
      flex: 1;
      margin-left: var(--sidebar-width);
      background: var(--bg-primary);
    }

    .topbar {
      background: var(--bg-secondary);
      border-bottom: 1px solid var(--border);
      padding: 1rem 1.5rem;
      position: sticky;
      top: 0;
      z-index: 50;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 1px 0 var(--border);
    }

    .current-category {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-primary);
    }

    .gallery-stats {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      color: var(--text-muted);
      font-size: 0.8125rem;
    }

    .stat-item {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      background: var(--bg-input);
      padding: 0.375rem 0.75rem;
      border-radius: 0.25rem;
    }

    .view-mode-toggle {
      display: flex;
      align-items: center;
      gap: 0.375rem;
      background: var(--bg-input);
      padding: 0.25rem;
      border-radius: 0.375rem;
    }

    .view-mode-btn {
      background: transparent;
      border: none;
      color: var(--text-muted);
      padding: 0.375rem 0.625rem;
      border-radius: 0.25rem;
      cursor: pointer;
      font-size: 0.875rem;
      transition: all 0.2s ease;
    }

    .view-mode-btn:hover {
      color: var(--text-primary);
      background: var(--bg-tertiary);
    }

    .view-mode-btn.active {
      background: var(--primary);
      color: #fff;
    }

    .stat-item i {
      color: var(--primary);
      font-size: 0.875rem;
    }

    .content-area {
      padding: 1.5rem;
      background: var(--bg-primary);
    }

    .gallery {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 1.5rem;
      opacity: 1;
      transition: opacity 0.2s ease;
    }

    .gallery.loading {
      opacity: 0.6;
    }

    .photo-card {
      background: var(--bg-card);
      border-radius: 0.5rem;
      overflow: hidden;
      position: relative;
      transition: var(--transition);
      cursor: pointer;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    }

    .photo-card:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    }

    .photo-container {
      position: relative;
      overflow: hidden;
      aspect-ratio: 16/10;
      background: var(--bg-secondary);
    }

    .photo-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

    .photo-card:hover img {
      transform: scale(1.03);
    }

    .photo-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(32, 34, 37, 0.9) 0%, transparent 60%);
      opacity: 0;
      transition: opacity 0.2s ease;
      display: flex;
      align-items: flex-end;
      padding: 1rem;
    }

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

    .photo-info {
      color: var(--text-primary);
      width: 100%;
    }

    .photo-name {
      font-weight: 600;
      margin-bottom: 0.25rem;
      font-size: 0.9375rem;
    }

    .photo-category {
      font-size: 0.8125rem;
      color: var(--text-muted);
      background: var(--bg-input);
      padding: 0.125rem 0.5rem;
      border-radius: 0.25rem;
      display: inline-block;
    }

    .expand-btn {
      position: absolute;
      top: 0.75rem;
      right: 0.75rem;
      background: rgba(32, 34, 37, 0.8);
      border: none;
      color: var(--text-secondary);
      width: 2.5rem;
      height: 2.5rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      opacity: 0;
      transition: var(--transition);
      font-size: 0.875rem;
    }

    .photo-card:hover .expand-btn {
      opacity: 1;
      background: var(--primary);
      color: white;
    }

    /* ───────── MOBILE TOGGLE ───────── */
    .mobile-toggle {
      display: none;
      position: fixed;
      top: 1rem;
      left: 1rem;
      z-index: 200;
      background: var(--primary);
      border: none;
      color: white;
      width: 3rem;
      height: 3rem;
      border-radius: 0.5rem;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

    /* ───────── LIGHTBOX ───────── */
    .lightbox {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(32, 34, 37, 0.95);
      z-index: 1000;
      animation: fadeIn 0.2s ease;
    }

    .lightbox.active {
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    .lightbox-content {
      position: relative;
      max-width: 90vw;
      max-height: 90vh;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .lightbox img {
      max-width: 100%;
      max-height: 80vh;
      border-radius: 0.5rem;
      box-shadow: 0 20px 40px var(--shadow);
      object-fit: contain;
    }

    .lightbox-info {
      margin-top: 1rem;
      text-align: center;
      color: var(--text-primary);
    }

    .lightbox-title {
      font-size: 1.125rem;
      font-weight: 600;
      margin-bottom: 0.25rem;
    }

    .lightbox-category {
      color: var(--text-muted);
      font-size: 0.8125rem;
    }

    .lightbox-controls {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 0 2rem;
      pointer-events: none;
    }

    .lightbox-btn {
      background: var(--bg-card);
      border: none;
      color: var(--text-secondary);
      width: 3rem;
      height: 3rem;
      border-radius: 50%;
      font-size: 1.125rem;
      cursor: pointer;
      transition: var(--transition);
      pointer-events: auto;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .lightbox-btn:hover {
      background: var(--primary);
      color: white;
    }

    .close-btn {
      position: absolute;
      top: 1.5rem;
      right: 1.5rem;
      background: var(--bg-card);
      border: none;
      color: var(--text-secondary);
      width: 3rem;
      height: 3rem;
      border-radius: 50%;
      font-size: 1.25rem;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .close-btn:hover {
      background: var(--danger);
      color: white;
    }

    .download-btn {
      position: absolute;
      top: 1.5rem;
      right: 5rem;
      background: var(--bg-card);
      border: none;
      color: var(--text-secondary);
      width: 3rem;
      height: 3rem;
      border-radius: 50%;
      font-size: 1.125rem;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 1001;
    }

    .download-btn:hover {
      background: var(--primary);
      color: white;
    }

    /* ───────── LIST VIEW ───────── */
    .gallery.list-view {
      display: flex;
      flex-direction: column;
      gap: 0.75rem;
    }

    .gallery.list-view .image-card {
      flex-direction: row;
      width: 100%;
      max-width: none;
      padding: 0.75rem;
    }

    .gallery.list-view .image-card img {
      width: 120px;
      height: 80px;
      object-fit: cover;
      border-radius: 0.375rem;
    }

    .gallery.list-view .image-name {
      text-align: left;
      margin-left: 1rem;
      flex: 1;
    }

    /* ───────── RESPONSIVE ───────── */
    @media (max-width: 1024px) {
      :root {
        --sidebar-width: 260px;
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
      }

      .sidebar {
        transform: translateX(-100%);
      }

      .sidebar.open {
        transform: translateX(0);
      }

      .main-content {
        margin-left: 0;
      }

      .topbar {
        padding: 1rem;
        margin-left: 4rem;
      }

      .content-area {
        padding: 1rem;
      }

      .gallery {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1rem;
      }

      .current-category {
        font-size: 1.25rem;
      }

      .gallery-stats {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-end;
      }
    }

    @media (max-width: 480px) {
      .gallery {
        grid-template-columns: 1fr;
      }

      .topbar {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
      }

      .lightbox-controls {
        padding: 0 1rem;
      }

      .lightbox-btn {
        width: 2.5rem;
        height: 2.5rem;
        font-size: 1rem;
      }
    }

    /* ───────── SCROLLBAR ───────── */
    .sidebar::-webkit-scrollbar {
      width: 6px;
    }

    .sidebar::-webkit-scrollbar-track {
      background: transparent;
    }

    .sidebar::-webkit-scrollbar-thumb {
      background: rgba(255, 255, 255, 0.2);
      border-radius: 3px;
    }

    .sidebar::-webkit-scrollbar-thumb:hover {
      background: rgba(255, 255, 255, 0.3);
    }

    /* ───────── LOADING ANIMATION ───────── */
    .loading-spinner {
      display: inline-block;
      width: 2rem;
      height: 2rem;
      border: 3px solid rgba(255, 255, 255, 0.3);
      border-radius: 50%;
      border-top-color: var(--primary);
      animation: spin 1s ease-in-out infinite;
    }

    @keyframes spin {
      to { transform: rotate(360deg); }
    }

    .empty-state {
      text-align: center;
      padding: 4rem 2rem;
      color: var(--text-muted);
    }

    .empty-state i {
      font-size: 4rem;
      margin-bottom: 1rem;
      opacity: 0.5;
    }