:root{--bg:#f4f6fb;--surface:#ffffff;--ink:#1c2333;--muted:#6b7488;--line:#e3e8f2;--primary:#1d6fe0;--primary-dark:#155bb8;--success:#16803c;--warning:#b7791f;--danger:#c0392b;--radius:10px}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--ink);font-size:14px;line-height:1.5}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.shell{display:flex;min-height:100vh}.sidebar{width:236px;flex-shrink:0;background:linear-gradient(180deg,#1e1b4b,#2e1065 60%,#4c1d95);color:#ddd6fe;display:flex;flex-direction:column;position:-webkit-sticky;position:sticky;top:0;height:100vh}.brand{padding:18px 16px;border-bottom:1px solid rgba(255,255,255,.1);gap:11px}.brand,.brand-logo{display:flex;align-items:center}.brand-logo{width:38px;height:38px;border-radius:12px;flex-shrink:0;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.2);box-shadow:0 0 18px 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