:root{--bg:#f5f7fa;--surface:#fff;--ink:#1d2e3f;--muted:#7a8897;--line:#e7edf2;--accent:#0e887d;--light:#e8f6f1;--warning:#b77712;--red:#d05151;--nav:#172d38;--radius:16px;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);font-size:14px;line-height:1.6}*{box-sizing:border-box}body{margin:0;background:var(--bg)}button,input,select,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.5;cursor:wait}a{color:var(--accent)}[hidden]{display:none!important}.shell{display:grid;grid-template-columns:234px 1fr;min-height:100vh}.sidebar{background:var(--nav);color:#aec0c7;padding:32px 17px 24px;position:fixed;width:234px;inset:0 auto 0 0;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;font-size:25px;font-weight:750;letter-spacing:2px;padding:0 12px}.brand 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