:root{--paper:#f6f4ed;--ink:#18343a;--muted:#647371;--line:#cbd6ca;--deep:#183f3b;--green:#2d765f;--amber:#d59a43;--blue:#6b98ae;--serif:Georgia,'Times New Roman','Songti SC',serif;--sans:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.7 var(--sans)}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit}.shell{width:min(1160px,calc(100% - 72px));margin-inline:auto}.progress{position:fixed;inset:0 0 auto;height:3px;z-index:20}.progress span{display:block;height:100%;background:var(--green);transform:scaleX(0);transform-origin:left}.topbar{min-height:88px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:30px}.brand{display:flex;align-items:center;gap:12px}.brand-mark{display:grid;place-items:center;width:40px;height:40px;background:var(--deep);color:#eaf0de;font:italic 18px 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