body{font-family:system-ui,Segoe UI,Roboto,Helvetica,Arial;margin:0;display:flex;flex-direction:column;height:100vh}
header{background:#111;color:#fff;padding:10px}
main{display:flex;flex:1;overflow:hidden}
.controls{width:360px;padding:12px;background:#f5f5f5;box-shadow:2px 0 0 rgba(0,0,0,0.05);overflow:auto}
#viewer{flex:1; background:#222}
.log{width:260px;padding:12px;background:#fafafa;border-left:1px solid #eee;overflow:auto}
button,input,label,textarea{display:block;margin:8px 0;width:100%}
textarea{height:80px}
footer{padding:8px;font-size:13px;background:#fff;border-top:1px solid #eee}
canvas{width:100%;height:100%}
#chat{height:200px;overflow:auto;background:#fff;padding:8px;border:1px solid #ddd}
.chat-msg{padding:6px;border-radius:6px;margin:6px 0}
.chat-user{background:#e6f7ff;text-align:right}
.chat-assistant{background:#f0f0f0;text-align:left}