:root{--page:#f5f5f7;--sidebar:#fff;--surface:#fff;--surface-strong:#fff;--hover:#f0f0f5;--line:#1d1d1f17;--text:#1d1d1f;--muted:#6e6e73;--soft:#86868b;--accent:#5e5adb;--danger:#ff3b30}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--page);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px}button,a{font:inherit}button{color:inherit}.app-shell{grid-template-columns:64px minmax(700px,1fr) 300px;min-height:100vh;display:grid}.sidebar{background:var(--sidebar);border-right:1px solid var(--line);flex-direction:column;align-items:center;height:100vh;padding:18px 7px 16px;display:flex;position:sticky;top:0}.brand-mark{background:var(--accent);color:#fff;border-radius:9px;place-items:center;width:32px;height:32px;margin-bottom:26px;font-weight:700;display:grid}.sidebar nav{gap:8px;width:100%;display:grid}.sidebar nav button{color:var(--muted);cursor:pointer;background:0 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