*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f5f5f5;min-height:100vh}.app{display:flex;flex-direction:column;height:100vh}.header{background:linear-gradient(135deg,#232f3e,#37475a);color:#fff;padding:16px 24px;display:flex;justify-content:space-between;align-items:center}.header h1{font-size:20px;font-weight:600}.header button{background:#ffffff1a;border:1px solid rgba(255,255,255,.3);color:#fff;padding:8px 16px;border-radius:6px;cursor:pointer}.login-container{display:flex;justify-content:center;align-items:center;height:100vh;background:linear-gradient(135deg,#232f3e,#37475a)}.login-box{background:#fff;padding:40px;border-radius:12px;box-shadow:0 4px 20px #0003;width:100%;max-width:400px}.login-box h2{margin-bottom:8px;color:#232f3e}.login-box p{color:#666;margin-bottom:24px}.login-box input{width:100%;padding:12px;margin-bottom:16px;border:1px solid #ddd;border-radius:6px;font-size:16px}.login-box button{width:100%;padding:14px;background:#f90;border:none;border-radius:6px;color:#fff;font-size:16px;font-weight:600;cursor:pointer}.login-box button:hover{background:#e88b00}.error{color:#d32f2f;margin-bottom:16px;font-size:14px}.chat-container{flex:1;display:flex;flex-direction:column;max-width:900px;margin:0 auto;width:100%;padding:20px}.messages{flex:1;overflow-y:auto;padding:20px 0}.message{margin-bottom:16px;display:flex;gap:12px}.message.user{flex-direction:row-reverse}.message-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px;flex-shrink:0}.message.assistant .message-avatar{background:#232f3e;color:#fff}.message.user .message-avatar{background:#f90;color:#fff}.message-content{background:#fff;padding:12px 16px;border-radius:12px;max-width:70%;box-shadow:0 1px 3px #0000001a}.message.user .message-content{background:#232f3e;color:#fff}.sources{margin-top:8px;padding-top:8px;border-top:1px solid #eee;font-size:12px;color:#666}.input-container{display:flex;gap:12px;padding:16px;background:#fff;border-radius:12px;box-shadow:0 -2px 10px #0000000d}.input-container input{flex:1;padding:14px;border:1px solid #ddd;border-radius:8px;font-size:16px}.input-container button{padding:14px 28px;background:#f90;border:none;border-radius:8px;color:#fff;font-weight:600;cursor:pointer}.input-container button:disabled{background:#ccc;cursor:not-allowed}.loading{display:flex;gap:4px;padding:8px}.loading span{width:8px;height:8px;background:#666;border-radius:50%;animation:bounce 1.4s infinite ease-in-out both}.loading span:nth-child(1){animation-delay:-.32s}.loading span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}