:root{--background:#f3f6f8;--surface:#fff;--surface-soft:#f8fafb;--sidebar:#102a2d;--sidebar-soft:#18383b;--text:#172326;--muted:#6a797d;--border:#dce5e7;--accent:#0f766e;--accent-dark:#0b5e58;--accent-soft:#e4f3f1;--danger:#a93d3d;--danger-soft:#fbeaea;--shadow:0 12px 32px #16313612}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--background);color:var(--text);margin:0;font-family:Arial,Helvetica,sans-serif}button,a{font:inherit}button{cursor:pointer}.app-shell{grid-template-columns:250px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{background:var(--sidebar);color:#fff;flex-direction:column;height:100vh;padding:28px 18px;display:flex;position:sticky;top:0}.brand{border-bottom:1px solid #ffffff1f;align-items:center;gap:12px;padding:0 10px 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