:root{--paper:#faf8f2;--white:#fffefb;--ink:#262b2a;--muted:#74776e;--line:#deded4;--red:#ac422f;--green:#3f6753;--wash:#f0eee6;--serif:Georgia,'Times New Roman',serif;--mono:Consolas,'Courier New',monospace}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:14px 'Segoe UI',Arial,sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--red);outline-offset:3px}button{color:inherit}a{color:inherit}.shell{display:grid;grid-template-columns:246px minmax(0,1fr);min-height:100vh}.rail{position:sticky;top:0;height:100vh;border-right:1px solid var(--line);padding:35px 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