:root{--paper:#f4f3ed;--ink:#173b3e;--muted:#6e8582;--line:#d9e1d9;--mint:#c4ed93;--aqua:#006b69;--coral:#ba4433;--white:#fffefa}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Avenir Next","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif}button,input{font:inherit}button{color:inherit;cursor:pointer;touch-action:manipulation;min-height:44px;padding:11px 15px;border:1px solid var(--line);border-radius:5px;background:var(--white);font-size:12px}button:disabled{opacity:.4;cursor:default}button:hover:not(:disabled){border-color:var(--aqua)}a{color:var(--aqua)}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,#game:focus-visible{outline:3px solid var(--coral);outline-offset:3px}header{padding:22px 36px;display:flex;align-items:center;justify-content:space-between;max-width:1330px;margin:auto;border-bottom:1px solid var(--line)}.brand{font-size:26px;font-weight:900;letter-spacing:-1.7px}.brand 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