:root{
  --bg:#0e1014;
  --bg2:#151922;
  --card:#1b2130;
  --line:#2a3242;
  --txt:#e8ecf4;
  --dim:#93a0b5;
  --acc:#5b8cff;
  --acc2:#8b5cf6;
  --ok:#22c55e;
  --warn:#f59e0b;
  --radius:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:radial-gradient(1200px 600px at 15% -10%,#1b2740 0%,transparent 60%),
             radial-gradient(900px 500px at 90% 0%,#241b3d 0%,transparent 55%),
             var(--bg);
  color:var(--txt);
  font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:980px;margin:0 auto;padding:0 18px}

header.site{
  position:sticky;top:0;z-index:10;
  backdrop-filter:blur(12px);
  background:rgba(14,16,20,.72);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:18px;height:58px}
.logo{display:flex;align-items:center;gap:9px;font-weight:700;letter-spacing:.2px;color:var(--txt);font-size:17px}
.logo .dot{width:10px;height:10px;border-radius:3px;background:linear-gradient(135deg,var(--acc),var(--acc2))}
.nav .sp{flex:1}
.nav a.navlink{color:var(--dim);font-size:14px}
.nav a.navlink:hover{color:var(--txt);text-decoration:none}

.hero{padding:46px 0 12px}
.hero h1{font-size:34px;line-height:1.15;margin:0 0 10px;letter-spacing:-.5px}
.hero p{margin:0;color:var(--dim);max-width:640px}
.hero .badge{display:inline-block;font-size:12px;color:#c7d2fe;background:#1e2a52;border:1px solid #2f3f77;border-radius:999px;padding:3px 10px;margin-bottom:14px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin:26px 0 34px}
.gcard{background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:var(--radius);padding:18px;display:flex;flex-direction:column;gap:10px;transition:transform .15s,border-color .15s}
.gcard:hover{transform:translateY(-2px);border-color:#3d4a63}
.gcard h3{margin:0;font-size:18px}
.gcard p{margin:0;color:var(--dim);font-size:14px}
.gcard .mini{height:76px;border-radius:12px;background:#121826;border:1px solid #232b3a;display:flex;align-items:center;justify-content:center;font-size:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid #33405c;background:linear-gradient(180deg,#2a3550,#222b40);color:var(--txt);padding:10px 16px;border-radius:12px;font-size:15px;cursor:pointer;text-decoration:none}
.btn:hover{text-decoration:none;border-color:#4a5a7d}
.btn.primary{background:linear-gradient(135deg,var(--acc),var(--acc2));border-color:transparent;font-weight:600}
.btn.primary:hover{filter:brightness(1.06)}
.btn:disabled{opacity:.5;cursor:default}

section h2{font-size:21px;margin:30px 0 6px}
.muted{color:var(--dim)}
.small{font-size:13px}

footer.site{margin-top:50px;border-top:1px solid var(--line);padding:24px 0 40px;color:var(--dim);font-size:14px}
footer .row{display:flex;gap:18px;flex-wrap:wrap;align-items:center}
footer .sp{flex:1}

/* game screens */
.gamehead{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:26px 0 14px}
.gamehead h1{font-size:26px;margin:0}
.scores{display:flex;gap:10px;margin-left:auto}
.score{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:7px 14px;text-align:center;min-width:84px}
.score b{display:block;font-size:19px}
.score span{font-size:11px;color:var(--dim);text-transform:uppercase;letter-spacing:.6px}
.panel{background:var(--bg2);border:1px solid var(--line);border-radius:var(--radius);padding:16px}

/* 2048 */
.board{position:relative;width:min(92vw,420px);aspect-ratio:1/1;background:#181f2c;border:1px solid var(--line);border-radius:14px;padding:10px;margin:0 auto;display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.cell{background:#121826;border-radius:10px}
.tile{position:absolute;z-index:1;display:flex;align-items:center;justify-content:center;font-weight:800;border-radius:10px;transition:left .1s ease,top .1s ease;font-size:clamp(18px,6vw,34px);color:#10131a}
.t2{background:#cdd7ee}.t4{background:#c2cde8}.t8{background:#f2b179;color:#fff}.t16{background:#f59563;color:#fff}
.t32{background:#f67c5f;color:#fff}.t64{background:#f65e3b;color:#fff}.t128{background:#edcf72;color:#fff;font-size:clamp(16px,5vw,28px)}
.t256{background:#edcc61;color:#fff;font-size:clamp(16px,5vw,28px)}.t512{background:#edc850;color:#fff;font-size:clamp(16px,5vw,28px)}
.t1024{background:#edc53f;color:#fff;font-size:clamp(13px,4vw,22px)}.t2048{background:#edc22e;color:#fff;font-size:clamp(13px,4vw,22px)}
.over{position:absolute;inset:0;z-index:5;background:rgba(14,16,20,.82);border-radius:14px;display:none;flex-direction:column;align-items:center;justify-content:center;gap:12px;font-size:22px;font-weight:700;text-align:center;padding:20px}
.over.show{display:flex}

/* snake */
canvas#snake{width:min(92vw,420px);aspect-ratio:1/1;background:#131a27;border:1px solid var(--line);border-radius:14px;display:block;margin:0 auto;touch-action:none}
.snakebar{display:flex;gap:10px;justify-content:center;margin:14px 0}

/* memory */
.memgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;max-width:460px;margin:0 auto}
.mcard{aspect-ratio:1/1;border-radius:12px;background:linear-gradient(160deg,#26314a,#1b2233);border:1px solid #33405c;display:flex;align-items:center;justify-content:center;font-size:30px;cursor:pointer;user-select:none;transition:transform .12s}
.mcard:active{transform:scale(.97)}
.mcard.open{background:#eef2fa;border-color:#eef2fa;color:#10131a}
.mcard.done{background:#1d3a2b;border-color:#2a5a41;color:#bcf5d5}
.hint{text-align:center;color:var(--dim);font-size:13px;margin-top:12px}
@media (max-width:520px){
  .hero h1{font-size:27px}
  .scores{width:100%;margin-left:0}
}