*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f9fafb;height:100dvh}#app{height:100dvh}.chat-container{display:flex;flex-direction:column;height:100%;max-width:600px;margin:0 auto;background:#fff}.chat-header{display:flex;align-items:center;padding:0 20px;height:60px;background:#2563eb;color:#fff;flex-shrink:0}.chat-header h1{font-size:18px;font-weight:600}.chat-messages{flex:1;overflow-y:auto;padding:20px 16px;display:flex;flex-direction:column;gap:12px;background:#f9fafb}.chat-welcome{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:16px;padding:0 40px;text-align:center}.chat-welcome-icon{width:72px;height:72px;border-radius:50%;background:#eff6ff;display:flex;align-items:center;justify-content:center}.chat-welcome h2{font-size:18px;font-weight:600;color:#18181b}.chat-welcome p{font-size:14px;line-height:1.6;color:#71717a}.chat-message{display:flex}.chat-message--user{justify-content:flex-end}.chat-message--assistant{justify-content:flex-start}.chat-bubble{max-width:75%;padding:10px 14px;border-radius:16px;font-size:14px;line-height:1.5;white-space:pre-wrap;word-break:break-word}.chat-message--user .chat-bubble{background:#2563eb;color:#fff;border-bottom-right-radius:4px}.chat-message--assistant .chat-bubble{background:#e5e7eb;color:#1f2937;border-bottom-left-radius:4px}.chat-bubble--loading{display:flex;gap:4px;padding:14px 20px}.dot{width:8px;height:8px;background:#9ca3af;border-radius:50%;animation:bounce 1.4s infinite ease-in-out both}.dot:nth-child(1){animation-delay:-.32s}.dot:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.chat-input{display:flex;gap:8px;padding:12px 16px;border-top:1px solid #E4E4E7;background:#fff;align-items:flex-end;flex-shrink:0}.chat-input textarea{flex:1;padding:10px 14px;border:1px solid #D1D5DB;border-radius:22px;font-size:14px;font-family:inherit;resize:none;outline:none;min-height:44px;max-height:120px;line-height:1.5}.chat-input textarea:focus{border-color:#2563eb}.chat-input button{width:44px;height:44px;background:#2563eb;color:#fff;border:none;border-radius:50%;font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .15s}.chat-input button:disabled{background:#93c5fd;cursor:not-allowed}.chat-input button:hover:not(:disabled){background:#1d4ed8}