:root{--paper:#f7f6f0;--ink:#202633;--muted:#717985;--line:#dedfd9;--blue:#5457da;--coral:#f48069;--board:#192335;--cell:25px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased;margin:0;font-family:Arial,Helvetica,sans-serif}button{font:inherit;cursor:pointer}button:disabled{cursor:not-allowed}button:focus-visible,a:focus-visible{outline-offset:3px;outline:3px solid #f4ad68}a{color:inherit;text-decoration:none}.site-shell{flex-direction:column;max-width:1440px;min-height:100vh;margin:auto;padding:0 56px;display:flex}.site-header{border-bottom:1px solid var(--line);flex:none;justify-content:space-between;align-items:center;height:91px;display:flex}.brand{letter-spacing:-1.25px;white-space:nowrap;align-items:center;gap:13px;font-size:22px;font-weight:800;display:inline-flex}.brand-period{color:var(--coral)}.brand-mark{grid-template-rows:repeat(2,8px);grid-template-columns:repeat(2,8px);gap:3px;display:grid;position:relative;transform:rotate(-10deg)}.brand-mark i{background:var(--blue);border-radius:2px;display:block}.brand-mark i:first-child{background:var(--coral)}.brand-mark i:nth-child(4){background:#a7c9b1}.header-right{color:#777e85;align-items:center;gap:25px;font-size:13px;display:flex}.header-note{letter-spacing:.01em}.header-divider{background:#d5d7d2;width:1px;height:19px}.sound-button{color:var(--ink);background:0 0;border:0;align-items:center;gap:9px;padding:10px 0;font-size:13px;font-weight:600;display:flex}.sound-button:hover{color:var(--blue)}.main-layout{flex:1;grid-template-columns:minmax(0,1fr) 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