:root{color-scheme:dark;background:#090d16;font-family:Trebuchet MS,Microsoft YaHei,sans-serif}*{box-sizing:border-box}html,body,#app{width:100%;height:100%;margin:0;overflow:hidden}body{background:radial-gradient(circle at 18% 12%,rgba(255,218,92,.18),transparent 28%),radial-gradient(circle at 75% 8%,rgba(117,215,255,.18),transparent 30%),linear-gradient(180deg,#17243d,#070a13)}.shell{min-height:100%;display:grid;place-items:center;padding:18px}.frame{width:min(100%,1500px);display:grid;grid-template-columns:minmax(0,1280px) 260px;gap:14px;align-items:stretch}#game-root{min-height:720px;border:2px solid rgba(255,230,143,.32);background:#050812;box-shadow:0 24px 80px #0000006b;position:relative}.upgrade-buttons{position:fixed;z-index:50;display:none;grid-template-columns:repeat(3,1fr);gap:28px;pointer-events:none}.upgrade-buttons.is-open{display:grid;pointer-events:auto}.upgrade-buttons button{min-width:160px;min-height:170px;padding:18px;border:2px solid #8fd7ff;background:#243553b3;color:#fff;font:700 18px Trebuchet MS,Microsoft YaHei,sans-serif;text-align:center;cursor:pointer}.upgrade-buttons button:hover{background:#315075e0;border-color:#ffef9c}.guide{min-height:720px;padding:18px;border:2px solid rgba(141,215,255,.22);background:#070c18c7;box-shadow:0 24px 80px #00000047}.guide h1{margin:0 0 10px;color:#ffe27a;font-size:30px}.guide p{margin:0 0 18px;color:#d6ecff;line-height:1.6}.guide dl{display:grid;grid-template-columns:72px 1fr;gap:10px 12px;margin:0}.guide dt{color:#8ee7ff;font-weight:700}.guide dd{margin:0;color:#fff3c4}canvas{display:block}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:1100px){body{overflow:auto}html,body,#app{height:auto;min-height:100%}.frame{grid-template-columns:1fr}#game-root,.guide{min-height:auto}}