:root{--brand:#1f4e5f;--ink:#1c2225;--muted:#77828a;--line:#e2e5e7;--bg:#fff;--stage:#f4f5f6;--rail:356px}*{box-sizing:border-box}html,body{height:100%;color:var(--ink);background:var(--bg);margin:0;padding:0;font:14px/1.4 -apple-system,Segoe UI,Roboto,system-ui,sans-serif}button{font:inherit;color:inherit;cursor:pointer}button:disabled{cursor:not-allowed}.app{grid-template-columns:1fr var(--rail);height:100vh;display:grid}.viewport{background:var(--stage);position:relative;overflow:hidden}.stage{place-items:center;display:grid;position:absolute;inset:84px 44px 28px}.corner{z-index:2;border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 15px;position:absolute;top:16px;box-shadow:0 1px 3px #00000014}.corner.tl{left:16px}.corner.tr{right:16px}.modes{z-index:2;border:1px solid var(--line);background:#fff;border-radius:999px;gap:4px;padding:4px;display:flex;position:absolute;top:16px;left:50%;transform:translate(-50%);box-shadow:0 1px 3px 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