:root{--bg:#f5f7fb;--panel:#fff;--text:#172033;--muted:#718096;--line:#e8edf5;--blue:#2563eb;--blue-soft:#eef4ff;--shadow:0 8px 30px rgba(25,45,80,0.06)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Tahoma,Segoe UI,sans-serif;font-size:14px}button,input{font:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:245px 1fr}.sidebar{position:-webkit-sticky;position:sticky;top:0;height:100vh;background:#fff;border-left:1px solid var(--line);padding:24px 16px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;padding:0 8px 28px}.brand-mark{display:grid;place-items:center;width:42px;height:42px;background:linear-gradient(135deg,#2563eb,#5b83f5);color:#fff;border-radius:13px;font-weight:800}.brand div,.sidebar-user div{display:flex;flex-direction:column}.brand strong{font-size:17px}.brand small,.sidebar-user small{color:var(--muted);margin-top:3px}.sidebar 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