:root{--ink:#1c1c1a;--muted:#76736d;--paper:#f3f0e8;--panel:#fbfaf6;--line:#d8d3c8;--orange:#e85d2a;--board-light:#e8dcc5;--board-dark:#8b6753;--cell:72px}*{box-sizing:border-box}html{background:var(--paper)}body{margin:0;background:radial-gradient(circle at 10% 10%,rgba(255,255,255,.68),transparent 32rem),var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif}button,a{font:inherit}button{color:inherit}.app-shell{min-height:100vh}.topbar{height:72px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 clamp(22px,4vw,64px);border-bottom:1px solid 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