:root{--bg:#eef1f6;--panel:#ffffff;--ink:#22283a;--mut:#7b8296;--acc:#2f39c6;--line:#dde2ec;--accbg:#e2e4f8}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.7 "Microsoft YaHei","PingFang SC",Arial,sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}.rail{position:fixed;inset:0 auto 0 0;width:76px;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;align-items:center;padding:20px 0;gap:26px;z-index:50}.rail .logo{width:40px;height:40px;background:var(--acc);color:#fff;display:grid;place-items:center;font:800 14px Georgia;border-radius:12px}.rail nav{display:flex;flex-direction:column;gap:10px}.rail nav a{min-width:54px;height:54px;padding:7px 9px;display:grid;place-items:center;border-radius:12px;font:700 11px Arial;color:var(--mut);background:var(--bg);text-align:center}.rail nav a span{display:block;font-size:8px;font-weight:400;margin-top:2px}.rail nav 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