/* ===== FILTER SIDEBAR ===== */
.filter-sidebar {
  position: fixed;
  left: 0;
  top: 0;
  height: 100vh;
  background: #ffffff;
  border-right: 1px solid rgba(0, 0, 0, 0.1);
  padding: 20px;
  overflow-y: auto;
  z-index: 50;
  box-shadow: 2px 0 12px rgba(0, 0, 0, 0.05);
}

.filter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid rgba(0, 0, 0, 0.1);
}

.filter-header h2 {
  font-size: 1.4em;
  font-weight: 600;
  margin: 0;
  color: #222;
}

#artwork-counter {
  font-size: 0.9em;
  color: #666;
  font-weight: 500;
  background: rgba(51, 102, 204, 0.1);
  padding: 4px 12px;
  border-radius: 12px;
}

/* Search box */
.filter-search-container {
  margin-bottom: 16px;
}

#filter-search {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  font-size: 0.95em;
  box-sizing: border-box;
  transition: all 0.2s ease;
}

#filter-search:focus {
  outline: none;
  border-color: rgba(51, 102, 204, 0.5);
  box-shadow: 0 0 0 3px rgba(51, 102, 204, 0.1);
}

#filter-search::placeholder {
  color: #999;
}

#clear-filters {
  background: rgba(0, 0, 0, 0.05);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 6px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 0.9em;
  font-weight: 500;
  color: #333;
  transition: all 0.2s ease;
  margin-bottom: 20px;
  width: 100%;
}

#clear-filters:hover {
  background: rgba(0, 0, 0, 0.1);
  border-color: rgba(0, 0, 0, 0.2);
}

/* Filter Sections */
.filter-section {
  margin-bottom: 24px;
}

.filter-section-header {
  font-size: 1.05em;
  font-weight: 600;
  margin-bottom: 12px;
  color: #333;
  cursor: pointer;
  user-select: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
}

.filter-section-header::after {
  content: '▼';
  font-size: 0.7em;
  color: #666;
  transition: transform 0.2s ease;
}

.filter-section.collapsed .filter-section-header::after {
  transform: rotate(-90deg);
}

.filter-section.collapsed .filter-options {
  display: none;
}

.filter-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.filter-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-option:hover {
  padding-left: 4px;
}

.filter-checkbox {
  width: 18px;
  height: 18px;
  cursor: pointer;
  flex-shrink: 0;
}

.filter-label {
  font-size: 0.95em;
  color: #444;
  cursor: pointer;
  line-height: 1.3;
}

.filter-option:hover .filter-label {
  color: #3366cc;
}

/* Main content with sidebar */
.content-with-sidebar {
  margin-left: 280px;
  padding: 20px;
  transition: margin-left 0.3s ease;
}

/* Category sections */
.category-section {
  margin-bottom: 60px;
}

/* Mobile filter toggle button */
.filter-toggle-btn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(108, 107, 104, 0.95);
  color: white;
  border: none;
  border-radius: 50px;
  padding: 14px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 60;
  transition: all 0.2s ease;
}

.filter-toggle-btn:hover {
  background: rgba(108, 107, 104, 0.95);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
}

/* Mobile responsive */
@media (max-width: 1024px) {
  .filter-sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  }
  
  .filter-sidebar.mobile-open {
    transform: translateX(0);
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.15);
  }
  
  .content-with-sidebar {
    margin-left: 0;
  }
  
  .filter-toggle-btn {
    display: block;
  }
}

@media (max-width: 768px) {
  .filter-sidebar {
    width: 100%;
    max-width: 320px;
  }
  
  .filter-header h2 {
    font-size: 1.2em;
  }
  
  #artwork-counter {
    font-size: 0.85em;
  }
}

/* Smooth transitions for filtered items */
.art-block {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.art-block[style*="display: none"] {
  opacity: 0;
  transform: scale(0.95);
}

/* Empty state when no results */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: #999;
  font-size: 1.1em;
  grid-column: 1 / -1;
}

.no-results-icon {
  font-size: 3em;
  margin-bottom: 16px;
  opacity: 0.3;
}