.App {
  display: flex;
  height: 100vh;
  width: 100vw;
  background-color: #f8fafc;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
  width: 280px;
  background: #ffffff;
  border-right: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  z-index: 100;
}

.sidebar-closed .sidebar {
  margin-left: -280px;
}

.sidebar-header {
  padding: 20px;
}

.new-chat-btn {
  width: 100%;
  padding: 12px;
  background: #6366f1;
  color: white;
  border: none;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.new-chat-btn:hover {
  background: #4f46e5;
  transform: translateY(-1px);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 10px 20px;
}

.sidebar-section {
  margin-bottom: 24px;
}

.section-title {
  font-size: 12px;
  font-weight: 700;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.sessions-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.session-item {
  padding: 10px 12px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.2s;
  color: #475569;
  position: relative;
  group: hover;
}

.session-item:hover {
  background: #f1f5f9;
  color: #1e293b;
}

.session-item.active {
  background: #eff6ff;
  color: #2563eb;
  font-weight: 500;
}

.session-title {
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.delete-session-btn {
  opacity: 0;
  background: transparent;
  border: none;
  color: #94a3b8;
  padding: 4px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}

.session-item:hover .delete-session-btn {
  opacity: 1;
}

.delete-session-btn:hover {
  background: #fee2e2;
  color: #ef4444;
}

.no-sessions {
  font-size: 13px;
  color: #94a3b8;
  text-align: center;
  padding: 20px 0;
}

.sidebar-footer {
  padding: 20px;
  border-top: 1px solid #e2e8f0;
}

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

.user-avatar {
  width: 36px;
  height: 36px;
  background: #6366f1;
  color: white;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  color: #1e293b;
}

.user-status {
  font-size: 12px;
  color: #22c55e;
}

/* Main Content Styles */
.main-content {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  transition: all 0.3s ease;
}

.chat-container {
  background: white;
  border-radius: 24px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
  width: 100%;
  max-width: 1000px;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid #e2e8f0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sidebar-toggle {
  color: #64748b;
}

.chat-header {
  background: white;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #f1f5f9;
}

.header-content h1 {
  font-size: 18px;
  margin: 0 0 2px 0;
  color: #1e293b;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}

.header-icon {
  color: #6366f1;
}

.header-content p {
  font-size: 12px;
  color: #64748b;
  margin: 0;
  font-weight: 500;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.uploaded-file-badge {
  background: #eff6ff;
  color: #3b82f6;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid #dbeafe;
  max-width: 200px;
}

.file-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.remove-file-btn {
  background: transparent;
  border: none;
  color: #93c5fd;
  cursor: pointer;
  padding: 2px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  margin-left: 4px;
  flex-shrink: 0;
}

.remove-file-btn:hover {
  background: #dbeafe;
  color: #2563eb;
}

.btn-icon {
  background: transparent;
  border: none;
  color: #64748b;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background: #f1f5f9;
  color: #1e293b;
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.message {
  display: flex;
  gap: 16px;
  animation: fadeIn 0.3s ease-out;
  max-width: 85%;
}

.message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message.assistant {
  align-self: flex-start;
}

.message.system {
  align-self: center;
  max-width: 100%;
  background: #f8fafc;
  padding: 8px 16px;
  border-radius: 12px;
  border: 1px solid #e2e8f0;
  font-size: 13px;
  color: #64748b;
}

.message.error {
  align-self: center;
  max-width: 100%;
  background: #fef2f2;
  color: #ef4444;
  padding: 10px 20px;
  border-radius: 20px;
  border: 1px solid #fee2e2;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.message.assistant .message-avatar {
  background: #e0e7ff;
  color: #6366f1;
}

.message.user .message-avatar {
  background: #f1f5f9;
  color: #475569;
}

.message.system .message-avatar {
  display: none;
}

.message.error .message-avatar {
  background: transparent;
  color: #ef4444;
}

.message-content {
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 15px;
  line-height: 1.6;
  position: relative;
  word-wrap: break-word;
}

.message.user .message-content {
  background: #6366f1;
  color: white;
  border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
  background: #f8fafc;
  color: #1e293b;
  border: 1px solid #e2e8f0;
  border-bottom-left-radius: 4px;
}

/* Markdown Styles */
.message-content p {
  margin: 0 0 10px 0;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content strong {
  font-weight: 600;
}

.message-content ul, .message-content ol {
  margin: 10px 0;
  padding-left: 24px;
}

.message-content li {
  margin-bottom: 6px;
}

.message-content code {
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 0.9em;
  padding: 2px 6px;
  border-radius: 4px;
}

.message.assistant .message-content code {
  background: #e2e8f0;
  color: #1e293b;
}

.message.user .message-content code {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

.message-content pre {
  background: #1e293b;
  color: #f8fafc;
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 10px 0;
}

.message-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.message-content blockquote {
  border-left: 4px solid #cbd5e1;
  margin: 10px 0;
  padding-left: 12px;
  color: #64748b;
  font-style: italic;
}

/* Loading State */
.message-content.loading {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #64748b;
  font-style: italic;
}

.spinner {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Example Queries */
.example-queries {
  padding: 12px 24px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  background: white;
  border-top: 1px solid #f1f5f9;
  scrollbar-width: none;
}

.example-queries::-webkit-scrollbar {
  display: none;
}

.example-query {
  background: white;
  border: 1px solid #e2e8f0;
  padding: 6px 12px;
  border-radius: 10px;
  font-size: 13px;
  color: #475569;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
}

.example-query:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: #1e293b;
  transform: translateY(-1px);
}

.example-query svg {
  color: #6366f1;
}

/* Input Area */
.input-container {
  padding: 20px 24px;
  background: white;
  border-top: 1px solid #f1f5f9;
  display: flex;
  gap: 12px;
  align-items: center;
}

.chat-input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  font-size: 15px;
  outline: none;
  transition: all 0.2s;
  background: #f8fafc;
}

.chat-input:focus {
  border-color: #6366f1;
  background: white;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.send-button {
  background: #6366f1;
  color: white;
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.send-button:hover:not(:disabled) {
  background: #4f46e5;
  transform: translateY(-1px);
}

.send-button:disabled {
  background: #e2e8f0;
  cursor: not-allowed;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    height: 100vh;
    box-shadow: 20px 0 50px rgba(0,0,0,0.1);
  }
  
  .main-content {
    padding: 0;
  }
  
  .chat-container {
    border-radius: 0;
    border: none;
  }
  
  .message {
    max-width: 90%;
  }
}