:root{font-family:Verdana,Geneva,sans-serif;background:#203448;color:#edf3f8;font-synthesis:none;--ink:#203448;--line:#708295;--orange:#ffc177}*{box-sizing:border-box}body{margin:0}main{max-width:1460px;margin:auto;padding:25px 4vw}header{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px}h1{font-family:Impact,'Arial Narrow',sans-serif;font-size:clamp(38px,5vw,65px);font-weight:400;letter-spacing:-.03em;margin:0}a{color:inherit;text-underline-offset:4px}header a{font-size:13px}.game{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(270px,.8fr);gap:42px;align-items:start}.screen{position:relative;background:white;aspect-ratio:1;overflow:hidden}.screen:fullscreen{width:min(100vw,100vh);height:min(100vw,100vh);margin:auto;background:white}canvas{width:100%;height:100%;display:block;image-rendering:pixelated;touch-action:none}#cover{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:24px;color:var(--ink);padding:24px;text-align:center}#cover[hidden]{display:none}#cover strong{font-family:Impact,'Arial Narrow',sans-serif;font-size:clamp(30px,5vw,60px);font-weight:400}#cover span{max-width:30ch;font-size:13px;line-height:1.6}button{font:inherit;font-size:13px;border:1px solid var(--line);border-radius:5px;padding:12px 14px;background:#edf3f8;color:var(--ink);cursor:pointer;min-height:44px;font-weight:bold}button:hover:not(:disabled){background:#d8e6f0}button:disabled{opacity:.5;cursor:default}button:focus-visible,input:focus-visible,a:focus-visible,canvas:focus-visible{outline:3px solid var(--orange);outline-offset:4px}#start{background:var(--ink);color:white;padding:16px 24px}.screen-caption{display:flex;justify-content:space-between;gap:12px;font-size:11px;margin:13px 0 18px}.screen-caption span:last-child{text-align:right}.actions{display:flex;gap:10px}.actions button{flex:1}.actions button:first-child{background:var(--orange);border-color:var(--orange)}aside{padding-top:8px}h2{font-size:20px;margin:0 0 18px}.instructions p{font-size:12px;line-height:1.8;margin:10px 0}kbd{font:inherit;display:inline-block;background:#344f69;padding:1px 5px;border-radius:3px;margin-right:3px;white-space:nowrap}.touch{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin:26px 0;max-width:320px}.touch button{font-size:19px;touch-action:none;user-select:none}.touch .fire{background:var(--orange);border-color:var(--orange)}label{display:flex;justify-content:space-between;font-size:12px;margin:22px 0 6px}output{font-variant-numeric:tabular-nums}input[type=range]{width:100%;accent-color:var(--orange);height:25px}.secondary-actions{display:flex;gap:8px;margin:25px 0}.secondary-actions button{flex:1;background:transparent;color:#fff}.help{font-size:12px;line-height:1.65;color:#c4d2df}#error{font-size:13px;line-height:1.6;border-left:3px solid var(--orange);padding:12px;background:#344f69}footer{display:flex;justify-content:space-between;gap:20px;font-size:11px;color:#bdcbd7;margin-top:35px;padding-top:17px;border-top:1px solid var(--line)}@media(max-width:850px){main{padding:20px}.game{grid-template-columns:1fr;gap:24px;max-width:650px;margin:auto}header{max-width:650px;margin:0 auto 20px}aside{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}.touch{margin:0}.instructions{grid-row:1/3}.secondary-actions,.help,#error{grid-column:1/-1}aside>label,aside>input{grid-column:1/-1}footer{max-width:650px;margin:25px auto 0}.screen-caption{font-size:10px}}@media(max-width:460px){main{padding:14px}header a{font-size:11px}aside{grid-template-columns:1fr}.touch{grid-column:1;width:100%;max-width:none;margin-top:14px}.instructions{grid-row:auto}.instructions p{font-size:11px}.actions{gap:6px}.actions button{font-size:11px;padding:10px 6px}footer{font-size:10px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

.colour-toggle{justify-content:flex-start;gap:10px;align-items:center}.colour-toggle input{accent-color:var(--orange);width:18px;height:18px}
.display-settings{min-width:0}
@media(max-width:850px){.display-settings{grid-column:1/-1}}
/* Keep the game square bounded by viewport height and spread controls wide. */
@media(min-width:1100px){
  main{max-width:1820px;padding:18px 32px 12px}
  header{margin-bottom:18px}h1{font-size:46px;line-height:1}
  .game{grid-template-columns:minmax(0,min(53vw,calc(100dvh - 225px))) minmax(0,1fr);gap:32px}
  aside{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px 24px;padding-top:0}
  .instructions,.secondary-actions,.help,#error{grid-column:1/-1}
  .instructions h2{margin-bottom:12px}.instructions p{margin:6px 0}
  .touch{margin:0;align-self:start;max-width:none;grid-column:1}
  .display-settings{grid-column:2}
  .display-settings label{margin:12px 0 5px}.display-settings .colour-toggle{margin-top:0}
  .secondary-actions{margin:0}.help{margin:0;max-width:80ch}
  .screen-caption{margin:10px 0 12px}
  footer{margin-top:18px;padding-top:10px}
}