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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: #f5f5f5;
  color: #333;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header h1 {
  font-size: 24px;
  font-weight: 600;
}

.user-info {
  display: flex;
  gap: 12px;
  align-items: center;
}

.user-info input {
  padding: 8px 12px;
  border: none;
  border-radius: 4px;
  font-size: 14px;
}

.main-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.sidebar {
  width: 300px;
  background: white;
  border-right: 1px solid #e0e0e0;
  padding: 24px;
  overflow-y: auto;
}

.sidebar-section {
  margin-bottom: 32px;
}

.sidebar-section h2 {
  font-size: 18px;
  margin-bottom: 16px;
  color: #333;
}

.filter-group {
  margin-bottom: 16px;
}

.filter-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 500;
  color: #666;
}

.filter-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
}

.content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

.cases-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.cases-header h2 {
  font-size: 24px;
  color: #333;
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 20px;
}

.case-card {
  background: white;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 20px;
  cursor: pointer;
  transition: all 0.2s;
}

.case-card:hover {
  border-color: #667eea;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.case-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: #333;
}

.case-card p {
  font-size: 14px;
  color: #666;
  margin-bottom: 12px;
  line-height: 1.5;
}

.case-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.status-open {
  background: #e3f2fd;
  color: #1976d2;
}

.status-in_progress {
  background: #fff3e0;
  color: #f57c00;
}

.status-resolved {
  background: #e8f5e9;
  color: #388e3c;
}

.status-closed {
  background: #f3e5f5;
  color: #7b1fa2;
}

.priority-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}

.priority-low {
  background: #e8f5e9;
  color: #388e3c;
}

.priority-medium {
  background: #fff3e0;
  color: #f57c00;
}

.priority-high {
  background: #ffe0b2;
  color: #f57c00;
}

.priority-urgent {
  background: #ffcdd2;
  color: #c62828;
}

.case-detail-view {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.case-detail-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.case-detail-header h2 {
  font-size: 24px;
  color: #333;
}

.case-detail-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
  flex: 1;
}

.case-info {
  background: white;
  padding: 20px;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
}

.case-info h3 {
  margin-bottom: 16px;
  font-size: 20px;
}

.info-row {
  display: flex;
  margin-bottom: 12px;
}

.info-label {
  font-weight: 600;
  width: 120px;
  color: #666;
}

.info-value {
  flex: 1;
  color: #333;
}

.case-actions {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.case-attachments {
  background: white;
  padding: 20px;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
}

.case-attachments h3 {
  margin-bottom: 16px;
  font-size: 18px;
}

.attachment-item {
  padding: 12px;
  background: #f5f5f5;
  border-radius: 4px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.attachment-item button {
  padding: 6px 12px;
  font-size: 12px;
}

.case-chat {
  background: white;
  padding: 20px;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 400px;
}

.case-chat h3 {
  margin-bottom: 16px;
  font-size: 18px;
}

.chat-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.chat-header h3 {
  margin-bottom: 0;
}

.chat-header button {
  font-size: 13px;
  padding: 6px 12px;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  background: #f9f9f9;
  border-radius: 4px;
  margin-bottom: 16px;
  min-height: 300px;
}

.message {
  margin-bottom: 16px;
  padding: 12px;
  border-radius: 8px;
  max-width: 70%;
}

.message.customer {
  background: #e3f2fd;
  margin-left: auto;
}

.message.engineer {
  background: #f5f5f5;
}

.message-header {
  font-size: 12px;
  color: #666;
  margin-bottom: 6px;
  font-weight: 600;
}

.message-content {
  font-size: 14px;
  color: #333;
  line-height: 1.5;
}

.chat-input-container {
  display: flex;
  gap: 12px;
}

.chat-input-container input {
  flex: 1;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.2s;
}

.btn-primary {
  background: #667eea;
  color: white;
}

.btn-primary:hover {
  background: #5568d3;
}

.btn-secondary {
  background: #e0e0e0;
  color: #333;
}

.btn-secondary:hover {
  background: #d0d0d0;
}

.btn-danger {
  background: #f44336;
  color: white;
}

.btn-danger:hover {
  background: #d32f2f;
}

.loading {
  text-align: center;
  padding: 40px;
  color: #999;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
}

.modal-content {
  background-color: white;
  margin: 5% auto;
  padding: 30px;
  border-radius: 8px;
  width: 90%;
  max-width: 500px;
  position: relative;
}

.close {
  position: absolute;
  right: 20px;
  top: 20px;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  color: #999;
}

.close:hover {
  color: #333;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  color: #333;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
}

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

.version-list {
  margin-top: 16px;
}

.version-item {
  padding: 12px;
  background: #f5f5f5;
  border-radius: 4px;
  margin-bottom: 8px;
}

.version-item h4 {
  font-size: 14px;
  margin-bottom: 4px;
}

.version-item p {
  font-size: 12px;
  color: #666;
}