:root{--bg:#f5f6f8;--panel:#fff;--text:#1f2329;--muted:#4b5563;--border:#e3e5e9;--primary:#0836ff;--primary-hover:#0435c9;--primary-soft:#0836ff14;--danger:#dc2626;--radius:10px;--header:64px}*{box-sizing:border-box}html,body{height:100%}body{background:var(--bg);color:var(--text);margin:0;font:14px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}a{color:var(--primary)}.visually-hidden{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em}.header{height:var(--header);border-bottom:1px solid var(--border);background:var(--panel);justify-content:space-between;align-items:center;gap:16px;padding:0 20px;display:flex}.header__brand{align-items:center;gap:12px;min-width:0;display:flex}.header__logo{flex:none;display:flex}.header__logo 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.15s;display:inline-flex}.btn--primary{background:var(--primary);color:#fff}.btn--primary:hover{background:var(--primary-hover)}.btn--ghost{border-color:var(--border);background:var(--panel);color:var(--text)}.btn--ghost:hover{border-color:var(--primary);color:var(--primary)}.toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.toolbar__group{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.segmented[hidden]{display:none}.stage{border:1px solid var(--border);border-radius:var(--radius);background:repeating-conic-gradient(#eef0f3 0% 25%,#f6f7f9 0% 50%) 50%/20px 20px;justify-content:center;min-height:0;display:flex;overflow:hidden}.stage__frame{background:#fff;border:none;width:100%;max-width:100%;height:100%;transition:width .3s}.code{border:1px solid var(--border);border-radius:var(--radius);background:var(--panel);flex-direction:column;min-height:0;display:flex;overflow:hidden}.code__head{border-bottom:1px solid 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