:root{--ink:#151A23;--bg:#F5F6F8;--line:#E4E7EC;--pri:#1F5EFF;--ai:#5B30C8;--ai-bg:#F0EBFF;--ai-line:#DDD3FA;--mut:#6B7380}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:Inter,Noto Sans SC,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.6;color:var(--ink);background:var(--bg)}button{font:inherit;cursor:pointer}.app{display:flex;height:100%}.rail{width:64px;flex:none;background:#121826;display:flex;flex-direction:column;align-items:center;padding:16px 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