:root{--brand-lime:#ccff00;--brand-dark:#111111;--brand-gray:#222222;--ui-font:'Courier New',Courier,monospace}body{margin:0;overflow:hidden;background-color:var(--brand-dark);color:#fff;font-family:var(--ui-font);touch-action:none}canvas{display:block;position:absolute;top:0;left:0;z-index:1}.screen{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;background:rgba(0,0,0,.85);z-index:10;text-align:center;padding:20px;box-sizing:border-box;transition:opacity .3s}.hidden{display:none!important}h1{font-size:3rem;margin:0 0 10px;color:var(--brand-lime);text-shadow:0 0 10px var(--brand-lime)}p{font-size:1.2rem;max-width:600px;line-height:1.5}.btn{margin-top:20px;padding:15px 40px;font-size:1.5rem;background:var(--brand-lime);color:#000;border:none;cursor:pointer;font-family:var(--ui-font);font-weight:700;text-transform:uppercase;box-shadow:0 0 15px var(--brand-lime);transition:transform .1s}.btn:active{transform:scale(.95)}.btn:hover{background:#fff}#hud{position:absolute;top:0;left:0;width:100%;padding:15px;box-sizing:border-box;display:flex;justify-content:space-between;pointer-events:none;z-index:5;text-shadow:1px 1px 0 #000}.stat-box{background:rgba(0,0,0,.5);padding:5px 10px;border:1px solid var(--brand-lime);border-radius:4px}#upgrade-menu{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:5}.upgrade-btn{background:rgba(0,0,0,.8);border:2px solid #555;color:#fff;padding:10px;cursor:pointer;text-align:center;font-family:var(--ui-font);width:100px;pointer-events:auto;transition:.2s}.upgrade-btn.affordable{border-color:var(--brand-lime);color:var(--brand-lime)}.upgrade-btn:active{background:#333}.upgrade-cost{display:block;font-size:.8rem;margin-top:5px;color:#888}.upgrade-btn.affordable .upgrade-cost{color:#fff}#watermark{position:absolute;bottom:10px;right:10px;opacity:.5;width:50px;z-index:2}