:root{--bg:#f4f5f7;--panel:#fff;--ink:#1d2330;--muted:#6b7280;--line:#e3e6ea;--accent:#2f5bd0;--accent-soft:#e8eefc}*{box-sizing:border-box}html,body{margin:0;height:100%}body{font:14px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}#topnav{display:flex;align-items:center;justify-content:space-between;padding:11px 18px;background:var(--panel);border-bottom:1px solid var(--line)}.brand{font-size:17px;font-weight:740;letter-spacing:-.01em}.brand .tag{font-size:11px;font-weight:600;color:var(--muted);background:#eef0f3;padding:2px 7px;border-radius:20px;margin-left:6px;vertical-align:middle}#main{padding:24px 18px}.boot{color:var(--muted)}#data-controls{display:flex;align-items:center;gap:8px}.app-shell{max-width:760px;margin:6vh auto;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:28px 30px}.app-shell h2{margin-top:0}.app-shell 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