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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f8fafc;
  color: #334155;
  line-height: 1.6;
}

.header {
  background: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header h1 {
  color: #1e293b;
  font-size: 1.5rem;
  font-weight: 600;
}

.add-btn {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.3);
}

.add-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 12px -1px rgba(59, 130, 246, 0.4);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

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

.item-card {
  background: white;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  cursor: pointer;
  position: relative;
}

.item-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.15);
}

.image-container {
  position: relative;
  height: 250px;
  overflow: hidden;
  background: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.item-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.3s;
}

.image-placeholder {
  width: 64px;
  height: 64px;
  background: #e2e8f0;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: 2rem;
}

.loading-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border: 3px solid #e2e8f0;
  border-top: 3px solid #3b82f6;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

.item-info {
  padding: 1rem;
}

.item-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.item-category {
  display: inline-block;
  background: #f1f5f9;
  color: #64748b;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.loading-message {
  text-align: center;
  padding: 3rem;
  color: #64748b;
  font-size: 1.1rem;
}

.error-message {
  text-align: center;
  padding: 3rem;
  color: #ef4444;
  background: #fef2f2;
  border-radius: 0.5rem;
  margin: 2rem 0;
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  z-index: 1000;
  padding: 2rem;
  overflow-y: auto;
}

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

.modal-content {
  background: white;
  border-radius: 1rem;
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  justify-content: between;
  align-items: center;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #64748b;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: #f1f5f9;
}

.modal-body {
  padding: 1.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: #374151;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  font-size: 1rem;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

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

.checkbox-group input[type="checkbox"] {
  width: auto;
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.gallery-image {
  width: 100%;
  height: 150px;
  object-fit: cover;
  border-radius: 0.5rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: border-color 0.2s;
}

.gallery-image:hover {
  border-color: #3b82f6;
}

.gallery-image.primary {
  border-color: #10b981;
}

.modal-actions {
  padding: 1.5rem;
  border-top: 1px solid #e2e8f0;
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background: #3b82f6;
  color: white;
}

.btn-primary:hover {
  background: #2563eb;
}

.btn-secondary {
  background: #e5e7eb;
  color: #374151;
}

.btn-secondary:hover {
  background: #d1d5db;
}

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

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

@media (max-width: 768px) {
  .header {
    padding: 1rem;
  }

  .header h1 {
    font-size: 1.25rem;
  }

  .container {
    padding: 1rem;
  }

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

  .modal {
    padding: 1rem;
  }
}