:root{--primary-color: #0070f3;--bg-color: #f7f9fc;--chat-bg: #ffffff}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--bg-color)}.chat-container{max-width:800px;margin:0 auto;height:100vh;display:flex;flex-direction:column;background:var(--chat-bg);box-shadow:0 0 20px #0000001a}.chat-header{padding:20px;border-bottom:1px solid #eaeaea;text-align:center;background:#fff}.messages-area{flex:1;padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:15px}.message{max-width:70%;padding:12px 16px;border-radius:12px;line-height:1.5}.message.user{align-self:flex-end;background-color:var(--primary-color);color:#fff;border-bottom-right-radius:2px}.message.assistant{align-self:flex-start;background-color:#f1f3f5;color:#333;border-bottom-left-radius:2px}.sources{margin-top:8px;font-size:.85em;color:#666;border-top:1px solid rgba(0,0,0,.1);padding-top:4px}.input-area{padding:20px;border-top:1px solid #eaeaea;display:flex;gap:10px;background:#fff}input{flex:1;padding:12px;border:1px solid #ddd;border-radius:8px;font-size:16px}button{padding:12px 24px;background-color:var(--primary-color);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer}button:disabled{background-color:#ccc}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400}body{margin:0;min-width:320px;min-height:100vh}