:root{--bg:#f4f7fb;--panel:#fff;--text:#202637;--muted:#7f899b;--border:#e7ebf1;--purple:#7252bf;--purple2:#8f5ce3;--shadow:0 8px 25px rgba(32,38,55,.07)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,Segoe UI,Arial,sans-serif}.app-shell{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:238px;background:#fff;border-right:1px solid var(--border);padding:18px 12px;display:flex;flex-direction:column;z-index:10}.brand{display:flex;align-items:center;gap:11px;padding:0 8px 18px;border-bottom:1px solid var(--border)}.brand-icon{width:39px;height:39px;border-radius:10px;background:linear-gradient(135deg,var(--purple2),var(--purple));display:grid;place-items:center;color:#fff;font-weight:800}.brand strong,.brand span{display:block}.brand span{font-size:11px;color:var(--muted);margin-top:2px}.sidebar 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