:root{--ink:#181818;--sub:#626262;--muted:#909090;--line:#d5d5d5;--soft:#efefef;--paper:#fff;--canvas:#f5f5f5;--accent:#161616;--radius:12px}*{box-sizing:border-box}body{margin:0;background:var(--canvas);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Arial,sans-serif;font-size:13px}button,input,textarea,select{font:inherit}button{cursor:pointer}#app{min-height:100vh}.app-shell{display:flex;min-height:100vh}.rail{width:260px;background:white;border-right:1px solid var(--line);position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;z-index:10}.brand{padding:27px 22px 20px;border-bottom:1px solid #eee}.brand-mark{font-size:11px;letter-spacing:2px;color:#777;margin-bottom:11px}.brand-title{font-size:18px;font-weight:750;letter-spacing:-.4px;line-height:1.45}.brand-desc{font-size:11px;color:#888;margin-top:7px;line-height:1.6}.role-tabs{padding:14px 13px;border-bottom:1px solid #eee;display:grid;grid-template-columns:1fr 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