:root{--bg:#f3f6fa;--surface:#fff;--surface-muted:#f8fafc;--text:#172033;--muted:#667085;--line:#d9e2ec;--primary:#164e9d;--primary-dark:#123b72;--green:#16803c;--orange:#b95d00;--red:#c4292f;--yellow:#a16a00;--shadow:0 8px 24px #15233814}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--bg);color:var(--text);margin:0;font-family:Arial,Helvetica,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.app-shell{grid-template-columns:260px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{color:#eef5ff;background:#12233d;height:100vh;padding:22px 16px;position:sticky;top:0}.brand{border-bottom:1px solid #ffffff29;margin-bottom:24px;padding:0 8px 18px}.brand-title{margin:0;font-size:22px;font-weight:800}.brand-subtitle{color:#b8c7da;margin:6px 0 0;font-size:13px;line-height:1.35}.nav{gap:6px;display:grid}.nav-link{color:#dbe8f7;border-radius:8px;padding:11px 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