/* GameHub — dark neon arcade theme */
:root{
  --bg:#0b1020; --bg2:#111a33; --card:#162044; --line:#26315c;
  --txt:#e8eefc; --mut:#9aa7cc;
  --cyan:#22d3ee; --pink:#f472b6; --lime:#a3e635; --amber:#facc15; --violet:#a78bfa;
  --radius:18px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{background:radial-gradient(1200px 600px at 50% -10%,#16224d 0%,var(--bg) 60%) fixed,var(--bg);
  color:var(--txt);font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",sans-serif;
  min-height:100vh;display:flex;flex-direction:column;line-height:1.5}
a{color:var(--cyan);text-decoration:none}
.wrap{width:100%;max-width:1080px;margin:0 auto;padding:0 16px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(11,16,32,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;color:var(--txt);letter-spacing:.5px}
.brand svg{width:34px;height:34px}
.brand em{font-style:normal;background:linear-gradient(90deg,var(--cyan),var(--pink));-webkit-background-clip:text;background-clip:text;color:transparent}
.lang-toggle{display:flex;background:var(--bg2);border:1px solid var(--line);border-radius:999px;overflow:hidden}
.lang-toggle button{border:0;background:transparent;color:var(--mut);padding:8px 16px;font-weight:700;cursor:pointer;font-size:.9rem}
.lang-toggle button.on{background:linear-gradient(90deg,var(--cyan),var(--pink));color:#0b1020}

/* hero */
.hero{text-align:center;padding:52px 16px 30px}
.hero h1{font-size:clamp(2rem,6vw,3.4rem);font-weight:900;line-height:1.15}
.hero h1 .g{background:linear-gradient(90deg,var(--cyan),var(--lime),var(--pink));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--mut);margin-top:12px;font-size:1.05rem;max-width:620px;margin-left:auto;margin-right:auto}
.hero .badges{display:flex;gap:10px;justify-content:center;margin-top:18px;flex-wrap:wrap}
.badge{border:1px solid var(--line);background:var(--bg2);color:var(--txt);border-radius:999px;padding:6px 14px;font-size:.85rem;font-weight:600}

/* game grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:16px;padding:10px 0 40px}
.card{background:linear-gradient(160deg,var(--card),#10173a);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 14px;text-align:center;color:var(--txt);transition:transform .15s,box-shadow .15s;display:block}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 32px rgba(34,211,238,.18);border-color:var(--cyan)}
.card .ico{font-size:2.6rem;display:block;margin-bottom:10px;filter:drop-shadow(0 4px 10px rgba(0,0,0,.5))}
.card h3{font-size:1.05rem;margin-bottom:6px}
.card p{font-size:.82rem;color:var(--mut)}
.card .play{display:inline-block;margin-top:12px;font-weight:800;font-size:.85rem;padding:8px 20px;border-radius:999px;color:#0b1020}

/* game page */
.game-page{flex:1;width:100%;max-width:640px;margin:0 auto;padding:20px 16px 40px;text-align:center}
.back{display:inline-block;margin-bottom:14px;color:var(--mut);font-weight:600;font-size:.9rem}
.back:hover{color:var(--cyan)}
.game-page h1{font-size:1.8rem;margin-bottom:6px}
.howto{color:var(--mut);font-size:.92rem;margin-bottom:14px}
.scorebar{display:flex;gap:12px;justify-content:center;margin-bottom:14px;flex-wrap:wrap}
.scorebar .pill{background:var(--bg2);border:1px solid var(--line);border-radius:999px;padding:6px 16px;font-size:.9rem;font-weight:700}
.scorebar .pill b{color:var(--amber)}
.game-wrap{position:relative;margin:0 auto;max-width:480px}
canvas.game{display:block;width:100%;border-radius:var(--radius);border:1px solid var(--line);background:#0a0f22;touch-action:none;user-select:none;-webkit-user-select:none}
.overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;
  background:rgba(8,12,28,.82);border-radius:var(--radius);backdrop-filter:blur(3px);padding:20px}
.overlay.hidden{display:none}
.overlay h2{font-size:1.6rem}
.overlay p{color:var(--mut)}
.btn{border:0;cursor:pointer;font-weight:800;font-size:1rem;padding:12px 34px;border-radius:999px;color:#0b1020;
  background:linear-gradient(90deg,var(--cyan),var(--lime));box-shadow:0 6px 24px rgba(34,211,238,.35)}
.btn:active{transform:scale(.97)}
.btn.ghost{background:transparent;color:var(--txt);border:1px solid var(--line);box-shadow:none}
.ctl-row{display:flex;gap:10px;justify-content:center;margin-top:14px;flex-wrap:wrap}
.flagbtn{border:1px solid var(--line);background:var(--bg2);color:var(--txt);border-radius:999px;padding:10px 18px;font-weight:700;cursor:pointer}
.flagbtn.on{background:var(--amber);color:#0b1020;border-color:var(--amber)}

/* memory grid */
.mem-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;max-width:480px;margin:0 auto;touch-action:manipulation}
.mem-card{aspect-ratio:1;border-radius:14px;border:1px solid var(--line);background:var(--card);font-size:2rem;
  display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .18s,background .18s;user-select:none}
.mem-card.flipped,.mem-card.done{background:#1d2a5e;transform:rotateY(180deg)}
.mem-card.done{border-color:var(--lime);cursor:default}
.mem-card:not(.flipped):not(.done):active{transform:scale(.94)}

/* footer */
footer{border-top:1px solid var(--line);margin-top:auto;background:rgba(11,16,32,.7)}
footer .wrap{padding:22px 16px;text-align:center;color:var(--mut);font-size:.85rem}
footer .sisters{margin-top:10px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
footer .sisters a{color:var(--mut);font-size:.82rem}
footer .sisters a:hover{color:var(--cyan)}

/* 404 */
.e404{text-align:center;padding:80px 16px}
.e404 h1{font-size:4rem}
@media(max-width:520px){.grid{grid-template-columns:repeat(2,1fr)}}