*{box-sizing:border-box}html,body,#root{margin:0;width:100%;height:100%;font-family:Arial,Helvetica,sans-serif}body{background:#f5f5f5}button,textarea{font-family:inherit}.app{min-height:100vh;display:flex;flex-direction:column}.header{background:#111;color:#fff;padding:18px 30px;display:flex;align-items:center;justify-content:space-between;border-bottom:3px solid #444}.header h1{margin:0;font-size:24px}.header p{margin:5px 0 0;color:#aaa;font-size:14px}.clear-button{background:transparent;color:#fff;border:1px solid #777;border-radius:6px;padding:9px 16px;cursor:pointer}.clear-button:hover{background:#333}.chat-container{width:100%;max-width:1000px;flex:1;margin:0 auto;padding:30px 20px;overflow-y:auto}.welcome{text-align:center;margin-top:100px;color:#666}.welcome h2{color:#222;font-size:28px}.example-question{margin-top:25px;padding:15px;background:#fff;border:1px solid #ddd;border-radius:10px;display:inline-block}.message{display:flex;flex-direction:column;margin-bottom:20px}.message.user{align-items:flex-end}.message.assistant{align-items:flex-start}.message-content{max-width:75%;padding:14px 18px;border-radius:12px;line-height:1.6;white-space:pre-wrap}.message.user .message-content{background:#222;color:#fff}.message.assistant .message-content{background:#fff;color:#222;border:1px solid #ddd}.loading{color:#666}details{max-width:75%;margin-top:8px}summary{cursor:pointer;color:#555;font-size:13px}.sources{margin-top:8px}.source{background:#fff;border:1px solid #ddd;border-radius:6px;padding:8px;margin-top:5px;font-size:12px}.input-area{width:100%;max-width:1000px;margin:0 auto;padding:15px 20px 25px;display:flex;gap:10px}.input-area textarea{flex:1;resize:none;border:1px solid #ccc;border-radius:8px;padding:12px;font-size:15px;outline:none}.input-area textarea:focus{border-color:#555}.input-area button{width:110px;border:none;border-radius:8px;background:#111;color:#fff;cursor:pointer;font-size:15px}.input-area button:hover:not(:disabled){background:#333}.input-area button:disabled{opacity:.4;cursor:not-allowed}@media(max-width:700px){.header{padding:15px}.header h1{font-size:18px}.chat-container{padding:20px 12px}.message-content{max-width:90%}details{max-width:90%}.input-area{padding:10px 12px 15px}.input-area button{width:80px}}