:root{--bg:#f6f7f9;--surface:#fff;--text:#16181d;--muted:#6b7280;--border:#e5e7eb;--primary:#111827;--accent:#4f46e5;--accent-soft:#eef2ff;--success:#047857;--success-bg:#ecfdf5;--warn:#b45309;--warn-bg:#fffbeb;--danger:#b91c1c;--danger-bg:#fef2f2;--radius:12px;--shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.1)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:ui-sans-system,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.shell{display:flex;min-height:100vh}.sidebar{width:248px;flex-shrink:0;background:#0f1222;color:#e5e7eb;display:flex;flex-direction:column;position:-webkit-sticky;position:sticky;top:0;height:100vh}.brand{padding:20px 18px;border-bottom:1px solid hsla(0,0%,100%,.08)}.brand b{display:block;font-size:15px;letter-spacing:.2px}.brand 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