:root{--paper:#f5f7f6;--ink:#22292b;--muted:#606d71;--line:#d0d8d9;--blue:#254be7;--soft:#ebefff;--mono:Consolas,'Courier New',monospace;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);scroll-behavior:smooth;scroll-padding-top:100px}*{box-sizing:border-box}body{margin:0;-webkit-font-smoothing:antialiased}a{color:inherit;text-underline-offset:5px}button{font:inherit}button,a,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}::selection{background:#dce3ff;color:#172c84}.shell{max-width:1320px;margin:0 auto;padding-inline:64px}header{position:sticky;top:0;z-index:20;background:rgba(245,247,246,.96);border-bottom:1px solid 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/* Readability refinements after real 390px browser review. */
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