body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; }
#messages::-webkit-scrollbar { width: 6px; }
#messages::-webkit-scrollbar-thumb { background: #374151; border-radius: 3px; }
#chatInput:focus { box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3); }