*{box-sizing:border-box}body{margin:0;color:#222;background:#fafafa;font:17px/1.8 system-ui,-apple-system,"Noto Sans JP",sans-serif}header,main,footer{max-width:920px;margin:auto;padding:24px}header{display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid #ddd}nav{display:flex;gap:20px;flex-wrap:wrap}a{color:#155986}main{min-height:48vh;background:white}h1{font-size:1.9rem}footer{font-size:.85rem;color:#555}.logo{width:150px;height:auto}img{max-width:100%;height:auto}.games{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:30px}.games img{max-width:300px}label{display:block;margin:18px 0 5px}input,textarea,button{font:inherit}input,textarea{width:100%;padding:10px;border:1px solid #888;border-radius:5px}button,.button{display:inline-block;padding:10px 24px;background:#155986;color:white;border:0;border-radius:5px;margin-top:20px}button:disabled{background:#777}.notice{padding:15px;background:#edf4fa;border-left:4px solid #155986}.error{border-color:#b33;background:#fff0f0}.hp{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #bc7c00;outline-offset:3px}@media(max-width:600px){header{display:block}nav{margin-top:20px}main,header,footer{padding:18px}}