/* CSS Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.15);
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  white-space: nowrap;
}

.search-container {
  flex: 1;
  max-width: 400px;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Main Content */
.main {
  flex: 1;
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  width: 100%;
}

/* Filters */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1.5rem;
  padding: 1rem;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-group label {
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.filter-select {
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background: white;
  cursor: pointer;
  min-width: 180px;
}

.filter-select:disabled {
  background: var(--bg-color);
  cursor: not-allowed;
  opacity: 0.7;
}

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

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.875rem;
}

.filter-info {
  margin-left: auto;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Asset Grid */
.asset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

/* Asset Card */
.asset-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
}

.asset-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.asset-card.hidden {
  opacity: 0.4;
  filter: grayscale(50%);
}

.asset-thumbnail {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--bg-color);
  display: block;
}

.asset-info {
  padding: 0.75rem;
}

.asset-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.asset-download-name {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: 'Monaco', 'Consolas', monospace;
  word-break: break-all;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.asset-badges {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  display: flex;
  gap: 0.25rem;
}

.badge {
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-free {
  background: #22c55e;
  color: white;
}

/* Admin Controls */
.hide-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(0,0,0,0.6);
  color: white;
  border: none;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  opacity: 0;
  transition: opacity 0.2s;
}

.asset-card:hover .hide-btn {
  opacity: 1;
}

.hide-btn:hover {
  background: rgba(0,0,0,0.8);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.page-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: white;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.page-btn:hover:not(:disabled) {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

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

#pageInfo {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Footer */
.footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-top: 1px solid var(--border-color);
  background: var(--card-bg);
}

/* Loading State */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.loading::after {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-left: 0.5rem;
  vertical-align: middle;
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.empty-state h3 {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

/* Admin Page Specific */
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.admin-actions {
  display: flex;
  gap: 0.75rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

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

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

.btn-secondary {
  background: white;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

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

.btn-danger {
  background: #ef4444;
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

/* Category Panel (Admin) */
.category-panel {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.category-panel h3 {
  margin-bottom: 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.category-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.category-toggle {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: white;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.category-toggle:hover {
  border-color: var(--primary-color);
}

.category-toggle.hidden {
  background: #fee2e2;
  border-color: #fecaca;
  color: #dc2626;
  text-decoration: line-through;
}

/* Category Tree (Admin) */
.category-tree {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-height: 400px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

.category-group {
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
}

.category-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: #f1f5f9;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.875rem;
  transition: background 0.2s;
}

.category-main:hover {
  background: #e2e8f0;
}

.category-main.hidden {
  background: #fee2e2;
  color: #dc2626;
  text-decoration: line-through;
}

.category-main .toggle-icon {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.category-main .cat-name {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.category-main .hide-indicator {
  font-size: 0.75rem;
  padding: 0.125rem 0.5rem;
  border-radius: 4px;
  background: #e2e8f0;
  cursor: pointer;
}

.category-main .hide-indicator:hover {
  background: #cbd5e1;
}

.category-main.hidden .hide-indicator {
  background: #dc2626;
  color: white;
}

.subcategory-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: white;
  border-top: 1px solid var(--border-color);
}

.subcategory-list.collapsed {
  display: none;
}

.subcategory-toggle {
  padding: 0.375rem 0.625rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: white;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.subcategory-toggle:hover {
  border-color: var(--primary-color);
  background: #eff6ff;
}

.subcategory-toggle.hidden {
  background: #fee2e2;
  border-color: #fecaca;
  color: #dc2626;
  text-decoration: line-through;
}

/* Subcategory buttons in admin */
.subcategory-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.subcat-btn {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: white;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all 0.2s;
}

.subcat-btn:hover {
  border-color: var(--primary-color);
  background: #eff6ff;
}

.subcat-btn.hidden {
  background: #fee2e2;
  border-color: #fecaca;
  color: #dc2626;
  text-decoration: line-through;
}

/* Hidden tags in summary */
.hidden-tag {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  background: #dc2626;
  color: white;
  border-radius: 4px;
  font-size: 0.75rem;
  margin: 0.125rem;
}

/* Status Messages */
.status-message {
  padding: 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-weight: 500;
}

.status-info {
  background: #dbeafe;
  color: #1e40af;
  border: 1px solid #93c5fd;
}

.status-success {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #86efac;
}

.status-error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

/* Responsive */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }

  .search-container {
    max-width: 100%;
  }

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

  .filter-group {
    width: 100%;
  }

  .filter-select {
    width: 100%;
  }

  .filter-info {
    margin-left: 0;
    text-align: center;
  }

  .asset-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
  }

  .main {
    padding: 1rem;
  }

  .pagination {
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .asset-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Selection Bar */
.selection-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: #dbeafe;
  border: 1px solid #93c5fd;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.selection-bar span {
  font-weight: 500;
  color: #1e40af;
}

.selection-bar .btn {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
}

/* Selected Card Highlight */
.asset-card.selected {
  outline: 3px solid var(--primary-color);
  outline-offset: -3px;
  background: #eff6ff;
}

.asset-card.selected:hover {
  outline-color: var(--primary-hover);
}

/* Selection Checkbox on Card */
.select-checkbox {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  width: 20px;
  height: 20px;
  cursor: pointer;
  z-index: 10;
  accent-color: var(--primary-color);
}

/* Make card clickable */
.asset-card {
  cursor: pointer;
}

/* Responsive selection bar */
@media (max-width: 768px) {
  .selection-bar {
    flex-wrap: wrap;
    justify-content: center;
  }
}