:root{--bg: #ffffff;--panel: #f6f7f9;--border: #e3e6ea;--text: #14171a;--muted: #6b7280;--accent: #2f6df6;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--bg: #0f1115;--panel: #171a20;--border: #262b33;--text: #e8eaed;--muted: #9aa3ad;--accent: #5b8cff}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app{display:grid;grid-template-columns:240px 1fr;grid-template-rows:auto 1fr auto;grid-template-areas:"header header" "aside main" "aside footer";height:100vh}header{grid-area:header;display:flex;align-items:baseline;gap:12px;padding:12px 18px;border-bottom:1px solid var(--border)}header h1{font-size:16px;margin:0}.status{color:var(--muted);font-size:13px}aside{grid-area:aside;border-right:1px solid var(--border);padding:14px;overflow-y:auto}aside ul{list-style:none;padding:0;margin:12px 0;font-size:13px;color:var(--muted)}aside li{overflow-wrap:anywhere;margin-bottom:6px}.upload{display:block;padding:10px;border:1px dashed var(--border);border-radius:8px;text-align:center;font-size:13px;cursor:pointer}.upload input{display:none}main{grid-area:main;overflow-y:auto;padding:18px}.empty{color:var(--muted)}article{margin-bottom:16px;display:flex;flex-direction:column}article.user{align-items:flex-end}.bubble{max-width:720px;padding:10px 14px;border-radius:12px;background:var(--panel);white-space:pre-wrap;overflow-wrap:anywhere}article.user .bubble{background:var(--accent);color:#fff}.trace{max-width:720px;font-size:12px;color:var(--muted);background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:6px 10px;margin-bottom:6px}.trace pre{white-space:pre-wrap;overflow-wrap:anywhere;margin:6px 0 0}footer{grid-area:footer;display:flex;gap:10px;padding:12px 18px;border-top:1px solid var(--border)}textarea{flex:1;resize:none;height:60px;padding:10px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);font:inherit}button{padding:0 20px;border:0;border-radius:8px;background:var(--accent);color:#fff;font:inherit;cursor:pointer}button:disabled{opacity:.5;cursor:default}button.ghost{background:transparent;color:var(--muted);border:1px solid var(--border);padding:6px 12px}@media(max-width:720px){.app{grid-template-columns:1fr;grid-template-areas:"header" "main" "footer"}aside{display:none}}