.chess-arena{--bg:#101713;--panel:#18221c;--border:#303d32;--muted:#a0afa2;--ink:#eaf0e5;--green:#c0e9a0;background:var(--bg);color:var(--ink);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:14px;line-height:1.5;color-scheme:dark}.chess-arena *{box-sizing:border-box}.chess-arena a,.chess-arena button,.chess-arena input,.chess-arena select,.chess-arena summary{-webkit-tap-highlight-color:transparent}.chess-arena a,.chess-arena button,.chess-arena select{transition:background .16s,border-color .16s,color .16s}.chess-arena button:disabled,.chess-arena select:disabled{opacity:.4;cursor:not-allowed}.chess-arena :focus-visible{outline:2px solid var(--green);outline-offset:4px}.arena-header{height:84px;padding:0 5%;border-bottom:1px solid 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