:root{--bg:#f6f6f4;--fg:#1f2328;--muted:#5c6370;--line:#d8dadd;--accent:#2f5d50;--card:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#161817;--fg:#e8e9e7;--muted:#9aa09d;--line:#2e3230;--accent:#7fb3a3;--card:#1e2120}}
*{box-sizing:border-box}html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:15px/1.6 system-ui,-apple-system,"Hiragino Sans",sans-serif}
main{max-width:640px;margin:0 auto;padding:32px 20px}
header{display:flex;align-items:center;gap:10px}h1{font-size:22px;margin:0}h2{font-size:16px;margin:0 0 4px}
.lead,.hint{color:var(--muted);margin:8px 0 16px}.hint{font-size:14px;margin:0 0 12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px;margin-bottom:16px}
summary{cursor:pointer;font-weight:600}details[open] summary{margin-bottom:8px}
label{display:block;font-weight:600;margin-bottom:12px}label.inline{display:inline-flex;align-items:center;gap:6px;margin:0;font-weight:500}
input,select{display:block;width:100%;margin-top:6px;padding:8px 10px;border:1px solid var(--line);border-radius:6px;font:inherit;background:var(--card);color:var(--fg)}
.inline input,.inline select{display:inline-block;width:auto;margin:0}
button{padding:8px 14px;border-radius:6px;border:1px solid var(--accent);background:var(--accent);color:var(--card);font:inherit;cursor:pointer}
button.secondary{background:transparent;color:var(--accent)}button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
#status{color:var(--muted)}.mono{font:600 20px/1.4 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.04em;margin:0 0 8px}
dt{color:var(--muted);font-size:13px}dd{margin:0}
.log{font:13px/1.5 ui-monospace,Menlo,monospace;color:var(--muted);max-height:200px;overflow:auto;padding-left:20px;margin:12px 0 0}
#viewer{display:flex;flex-direction:column;height:100%;background:#000}
#viewer[hidden]{display:none}
#stage{flex:1;min-height:0;position:relative;outline:none;touch-action:none;cursor:default}
#stage video{width:100%;height:100%;object-fit:contain;display:block}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:8px 12px;background:var(--card);border-top:1px solid var(--line)}
#viewerStatus{color:var(--muted);margin-right:auto;font-size:14px}
.overlay{position:absolute;left:12px;bottom:12px;margin:0;max-width:min(560px,90%);background:rgba(0,0,0,.72);color:#e8e9e7;border-radius:6px;padding:8px 8px 8px 28px;pointer-events:none}
#preview{width:100%;max-height:180px;background:#000;border-radius:6px;margin-top:4px}