:root{--nav:#101827;--nav2:#172235;--gold:#d7a83d;--blue:#1677ff;--green:#13b77a;--text:#18202d;--muted:#7a8493;--line:#e7eaf0;--bg:#f3f5f8;--white:#fff;--red:#ef5252;--orange:#f39b35}*{box-sizing:border-box}body{margin:0;font-family:"Segoe UI","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);font-size:14px}.sidebar{position:fixed;inset:0 auto 0 0;width:218px;background:linear-gradient(180deg,var(--nav),#0b1220);color:#c9d1dd;padding:24px 15px;z-index:3}.brand{display:flex;align-items:center;gap:12px;padding:0 10px 26px;border-bottom:1px solid #283347}.brand-mark{width:43px;height:43px;border:1px solid var(--gold);color:var(--gold);display:grid;place-items:center;font-weight:800;font-size:19px;border-radius:11px}.brand b{display:block;color:white;font-size:17px}.brand span{font-size:11px;color:#8490a3;letter-spacing:2px}.sidebar nav{display:flex;flex-direction:column;gap:5px;padding-top:22px}.nav-item{border:0;background:transparent;color:#aeb8c7;padding:12px 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