:root{color-scheme:light dark}*{box-sizing:border-box}body,html{height:100%;margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.container{max-width:800px;margin:0 auto;padding:24px}.card{border:1px solid rgba(127,127,127,.2);border-radius:12px;padding:16px}.row{display:flex;gap:8px}.input{width:100%;padding:10px 12px}.btn,.input{border-radius:10px;border:1px solid rgba(127,127,127,.3)}.btn{padding:10px 14px;cursor:pointer;background:transparent}.msg{white-space:pre-wrap;line-height:1.5}.msg.assistant{background:rgba(127,127,127,.08);border-radius:10px;padding:10px 12px}.msg.user{background:transparent;border-left:3px solid rgba(127,127,127,.25);padding:10px 12px}.meta{font-size:12px;opacity:.7}hr{border:none;border-top:1px solid rgba(127,127,127,.2);margin:12px 0}select{padding:8px 10px;border-radius:10px;border:1px solid rgba(127,127,127,.3)}