:root{--bg:#05070a;--panel:#0b1117;--panel2:#0e161e;--line:#1d2a34;--muted:#71808e;--text:#e8edf1;--cyan:#35cdf4;--gold:#e1b85b;--green:#16d6a0;--red:#ff4d70;--light:#d8c39a;--dark:#52616b}*{box-sizing:border-box}html,body{min-height:100%;margin:0;background:radial-gradient(circle at 48% 35%,#10202b 0,#070b0f 38%,#040609 75%);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,a{font:inherit}.chess-shell{width:min(1500px,calc(100% - 32px));margin:26px auto}.chess-topbar{min-height:82px;padding:14px 18px;display:grid;grid-template-columns:260px 1fr auto;align-items:center;gap:20px;border:1px solid var(--line);border-radius:12px;background:#090e13e8;box-shadow:0 20px 60px #0008}.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:42px;height:42px;display:grid;place-items:center;border:1px solid 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