:root{--bg: #0f1115;--panel: #171a21;--panel2: #1e222b;--line: #2a2f3a;--fg: #e6e9ef;--dim: #9aa3b2;--acc: #6ea8fe;--accd: #3f6fd6;--warn: #f0b24a}*{box-sizing:border-box}html,body{max-width:100%;overflow-x:clip}img,canvas,video{max-width:100%}body{margin:0;background:var(--bg);color:var(--fg);font-family:-apple-system,Segoe UI,Hiragino Sans,Noto Sans JP,sans-serif}.mono{font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:11px;color:var(--dim)}.hint{font-size:12px;color:var(--dim);margin:6px 0;line-height:1.5}button{background:var(--panel2);color:var(--fg);border:1px solid var(--line);border-radius:7px;padding:6px 10px;font-size:13px;cursor:pointer}button:hover{border-color:var(--acc)}button:disabled{opacity:.4;cursor:not-allowed}button.on,.seg 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