:root{
  --paper:#f1f2fb; --ink:#16162e; --muted:#5d5f86; --line:#cfd1ea;
  --cobalt:#2a35ff; --cobalt-d:#1b24c9; --yellow:#ffd23f; --mint:#35d49a; --pink:#ff5fa2;
  --display:"Avenir Next","Avenir","Trebuchet MS","Segoe UI",system-ui,sans-serif;
  --body:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.6 var(--body);min-height:100vh;display:flex;flex-direction:column}
a{color:inherit}
:focus-visible{outline:3px solid var(--cobalt);outline-offset:3px;border-radius:4px}
.wrap{width:100%;max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
.top{border-bottom:2px solid var(--ink)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font:800 24px/1 var(--display);letter-spacing:-.03em}
.brand svg{width:30px;height:30px}
.top nav{display:flex;gap:22px;font-weight:600}
.top nav a{text-decoration:none;padding:6px 0;border-bottom:2px solid transparent}
.top nav a:hover{border-color:var(--cobalt)}

/* hero */
.hero{padding:56px 0 48px}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
h1{font:800 clamp(40px,6.4vw,72px)/.98 var(--display);letter-spacing:-.045em;margin:0 0 20px}
.lead{font-size:20px;max-width:30ch;margin:0 0 28px;color:var(--muted)}
.btn{display:inline-block;background:var(--cobalt);color:#fff;text-decoration:none;font-weight:700;padding:14px 26px;border-radius:999px;border:2px solid var(--ink);box-shadow:4px 4px 0 var(--ink);transition:transform .12s,box-shadow .12s}
.btn:hover{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--ink)}
.btn.alt{background:var(--yellow);color:var(--ink)}
.demo{background:var(--cobalt);border:2px solid var(--ink);border-radius:22px;padding:14px;box-shadow:8px 8px 0 var(--ink)}
.demo canvas{display:block;width:100%;height:auto;border-radius:12px;background:#1b24c9}
.demo p{margin:10px 4px 0;color:#dfe2ff;font-size:14px}

/* list of games */
.games{padding:24px 0 56px}
.games h2{font:800 34px/1.1 var(--display);letter-spacing:-.03em;margin:0 0 20px}
.row{display:grid;grid-template-columns:72px 1fr auto auto;gap:20px;align-items:center;padding:20px 0;border-top:2px solid var(--ink)}
.row:last-of-type{border-bottom:2px solid var(--ink)}
.row .ico{width:72px;height:72px;border-radius:16px;border:2px solid var(--ink);display:grid;place-items:center;font-size:34px}
.row h3{margin:0;font:800 24px/1.1 var(--display);letter-spacing:-.02em}
.row p{margin:4px 0 0;color:var(--muted);max-width:46ch}
.score{text-align:right;font-weight:700;min-width:96px;font-variant-numeric:tabular-nums}
.score small{display:block;color:var(--muted);font-weight:500;font-size:13px}
.row.soon{opacity:.55}

/* about */
.about{padding:48px 0 64px;max-width:62ch}
.about h1{font-size:clamp(34px,5vw,52px)}
.about h2{font:800 24px/1.2 var(--display);letter-spacing:-.02em;margin:32px 0 8px}
.about p{margin:0 0 14px}

/* game page */
.stage{padding:36px 0 56px}
.stage .wrap{display:grid;grid-template-columns:minmax(0,520px) 1fr;gap:40px;align-items:start}
.board{background:var(--cobalt);border:2px solid var(--ink);border-radius:22px;padding:14px;box-shadow:8px 8px 0 var(--ink)}
.board canvas{display:block;width:100%;height:auto;border-radius:12px;background:#1b24c9;touch-action:none}
.side h1{font-size:clamp(34px,5vw,52px);margin-bottom:12px}
.side p{color:var(--muted);margin:0 0 20px;max-width:38ch}
.stats{display:flex;gap:28px;margin:0 0 22px;font-variant-numeric:tabular-nums}
.stats div{font:800 38px/1 var(--display);letter-spacing:-.03em}
.stats span{display:block;font:500 14px/1.4 var(--body);letter-spacing:0;color:var(--muted)}
.pad{display:grid;grid-template-columns:repeat(3,64px);grid-template-rows:repeat(2,64px);gap:8px;margin-top:22px}
.pad button{font-size:24px;border:2px solid var(--ink);border-radius:14px;background:#fff;cursor:pointer}
.pad button:active{background:var(--yellow)}
.pad .u{grid-column:2}
.msg{min-height:1.6em;font-weight:700;margin-top:14px}

/* memory */
.deck{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.card{aspect-ratio:1/1;border:2px solid var(--ink);border-radius:14px;background:#fff;font-size:clamp(28px,7vw,48px);cursor:pointer;display:grid;place-items:center;transition:transform .15s,background .15s;padding:0}
.card .back{color:var(--cobalt);font:800 30px/1 var(--display)}
.card.open{background:var(--yellow)}
.card.done{background:var(--mint);cursor:default}

/* reaction */
.zone{width:100%;aspect-ratio:4/3;border:0;border-radius:12px;background:#1b24c9;color:#fff;font:800 clamp(22px,4vw,34px)/1.2 var(--display);cursor:pointer;padding:20px;text-align:center}
.zone.wait{background:var(--pink)}
.zone.go{background:var(--mint);color:var(--ink)}
.hist{margin:0;padding:0;list-style:none;font-variant-numeric:tabular-nums}
.hist li{padding:6px 0;border-bottom:1px solid var(--line)}

/* footer */
footer{margin-top:auto;border-top:2px solid var(--ink);padding:22px 0;color:var(--muted);font-size:15px}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer a{text-decoration:none;border-bottom:1px solid var(--line)}

@media (max-width:820px){
  .hero .wrap,.stage .wrap{grid-template-columns:1fr;gap:28px}
  .hero{padding-top:36px}
  .row{grid-template-columns:56px 1fr;gap:6px 16px}
  .row .ico{width:56px;height:56px;font-size:26px;grid-row:1/3}
  .row .score{grid-column:2;text-align:left}
  .row .btn{grid-column:2;justify-self:start}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}