@font-face{font-family:'Fredoka';font-style:normal;font-weight:400 700;font-display:swap;
  src:url(/assets/fonts/fredoka-6438e7de.woff2) format('woff2');unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
@font-face{font-family:'Inter';font-style:normal;font-weight:400 700;font-display:swap;
  src:url(/assets/fonts/inter-f11d729b.woff2) format('woff2');unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}

/* Dark is the default everywhere. Light is opt in, via the header toggle only,
   so the site looks the same whatever the device preference says. */
:root{
  --bg:#12102A; --bg2:#191640; --card:#221E52; --card2:#2A2560;
  --ink:#F5F2FF; --dim:#A9A2D8; --line:#37306E;
  --cyan:#3DDCFF; --pink:#FF5CA8; --lime:#B6F24C; --yellow:#FFC84A; --violet:#9B7BFF;
  --ok:#5BE8B0; --bad:#FF6B6B;
  --cyan-fg:#3DDCFF; --pink-fg:#FF5CA8; --lime-fg:#B6F24C; --yellow-fg:#FFC84A;
  --violet-fg:#9B7BFF; --ok-fg:#5BE8B0; --bad-fg:#FF6B6B;
  --blob-a:.30;
  --chip-bg:#2A2560; --chip-fg:#B4A0FF;
  --gap0:#FF7043; --gap1:#FF9F45; --gap2:#FFC84A; --gap3:#B6F24C; --gap4:#5BE8B0;
  --disp:'Fredoka',ui-rounded,system-ui,sans-serif;
  --ui:'Inter',ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --r:18px; --r-lg:26px;
}
:root[data-theme="light"]{
  --bg:#F6F4FD; --bg2:#ECE8FA; --card:#FFFFFF; --card2:#F5F2FE;
  --ink:#191436; --dim:#585279; --line:#DFDAF2;
  --cyan-fg:#0A6B85; --pink-fg:#B2275C; --lime-fg:#43680D; --yellow-fg:#7A5400;
  --violet-fg:#4F33BC; --ok-fg:#0A6B4B; --bad-fg:#AE2C2C;
  --blob-a:.20;
  --chip-bg:color-mix(in srgb,var(--violet) 26%,transparent); --chip-fg:#3F2799;
  --gap0:#A33B17; --gap1:#8A5209; --gap2:#7A5400; --gap3:#43680D; --gap4:#0A6B4B;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--ui);font-size:16px;
  -webkit-tap-highlight-color:transparent;
  line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3{font-family:var(--disp);font-weight:600;line-height:1.05;letter-spacing:-.02em;margin:0}
h1{font-size:clamp(2.6rem,7vw,4.8rem);font-weight:700}
h2{font-size:clamp(1.8rem,4vw,2.8rem)}
h3{font-size:1.2rem}
p{margin:0 0 1rem}
a{color:var(--cyan-fg)}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:3px solid var(--yellow);outline-offset:3px;border-radius:8px}
.wrap{max-width:1140px;margin:0 auto;padding-inline:22px}
.sect{padding-block:clamp(3rem,6vw,5rem)}
.dim{color:var(--dim)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* playful backdrop */
.blobs{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:var(--blob-a)}
.blob.b1{width:420px;height:420px;background:var(--violet);top:-120px;left:-100px}
.blob.b2{width:380px;height:380px;background:var(--cyan);top:120px;right:-120px}
.blob.b3{width:340px;height:340px;background:var(--pink);top:780px;left:-80px}
.shell{position:relative;z-index:1}

/* nav */
.nav{position:sticky;top:0;z-index:40;backdrop-filter:blur(14px);
  background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:1.1rem;height:64px}
.brand{display:flex;align-items:center;gap:.55rem;font-family:var(--disp);font-weight:700;
  font-size:1.4rem;text-decoration:none;color:var(--ink);margin-right:auto;letter-spacing:-.02em}
.brand svg{width:32px;height:32px;flex:none}
.nav a.lnk{color:var(--dim);text-decoration:none;font-size:.94rem;font-weight:500;
  display:inline-flex;align-items:center;gap:.42rem;padding:.35rem .1rem;border-radius:9px}
.nav a.lnk:hover{color:var(--ink)}
.nico{width:18px;height:18px;flex:none}
.nav a.lnk[aria-current="page"]{color:var(--ink)}
/* below this the labels drop away and the icons carry the nav on their own */
@media(max-width:640px){
  .nav a.lnk .ltxt{position:absolute;width:1px;height:1px;overflow:hidden;
    clip:rect(0 0 0 0);white-space:nowrap}
  .nav a.lnk{padding:.6rem;gap:0}
  .nav .wrap{gap:.3rem}
  .nico{width:21px;height:21px}
}
@media(max-width:410px){
  .nav .wrap{gap:.22rem}
  .nav a.lnk{padding:.45rem}
  .nico{width:19px;height:19px}
  .themebtn{width:34px;height:34px}
  .brand{font-size:1.15rem;gap:.35rem}
  .brand svg{width:26px;height:26px}
}
@media(max-width:370px){
  .brandword{position:absolute;width:1px;height:1px;overflow:hidden;
    clip:rect(0 0 0 0);white-space:nowrap}   /* the mark alone carries the brand */
  .brand{margin-right:auto}
}

/* hero */
.hero{padding-block:clamp(3rem,7vw,5.5rem);text-align:center}
.kick{display:inline-flex;align-items:center;gap:.5rem;background:var(--card);
  border:1px solid var(--line);border-radius:999px;padding:.4rem 1rem;font-size:.82rem;
  font-weight:600;color:var(--dim);margin-bottom:1.4rem}
.kick b{color:var(--lime-fg);font-weight:700}
.hero h1{max-width:16ch;margin:0 auto}
.hero h1 .pop{color:var(--yellow-fg);display:inline-block}
.hero p.sub{font-size:1.14rem;color:var(--dim);max-width:52ch;margin:1.2rem auto 0}
.herobtns{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap;margin-top:2rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55rem;border:0;
  border-radius:999px;padding:.95rem 1.9rem;font-family:var(--disp);font-weight:600;
  font-size:1.05rem;text-decoration:none;transition:transform .12s ease,filter .2s ease}
.btn:hover{transform:translateY(-2px)}
.btn-main{background:var(--lime);color:#14210A}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--dim)}

/* game grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:1.1rem}
.gcard{position:relative;text-align:left;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:1.5rem;display:flex;flex-direction:column;gap:.5rem;
  transition:transform .14s ease,border-color .14s ease,background .14s ease;width:100%}
.gcard:hover{transform:translateY(-4px);background:var(--card2)}
.gcard .emoji{font-size:2.1rem;line-height:1}
.gcard h3{font-size:1.25rem}
.gcard p{font-size:.92rem;color:var(--dim);margin:0;flex:1}
.gcard .foot{display:flex;align-items:center;gap:.6rem;margin-top:.7rem;font-size:.82rem}
.pill{border-radius:999px;padding:.2rem .65rem;font-weight:650;font-size:.74rem;
  background:var(--bg2);color:var(--dim)}
.gcard .best{margin-left:auto;color:var(--yellow-fg);font-weight:650}
.gcard.c0{border-color:color-mix(in srgb,var(--cyan) 42%,var(--line))}
.gcard.c1{border-color:color-mix(in srgb,var(--pink) 42%,var(--line))}
.gcard.c2{border-color:color-mix(in srgb,var(--lime) 42%,var(--line))}
.gcard.c3{border-color:color-mix(in srgb,var(--yellow) 42%,var(--line))}
.gcard.c4{border-color:color-mix(in srgb,var(--violet) 42%,var(--line))}
.gcard.c5{border-color:color-mix(in srgb,var(--ok) 42%,var(--line))}
.gcard.c0:hover{border-color:var(--cyan)} .gcard.c1:hover{border-color:var(--pink)}
.gcard.c2:hover{border-color:var(--lime)} .gcard.c3:hover{border-color:var(--yellow)}
.gcard.c4:hover{border-color:var(--violet)} .gcard.c5:hover{border-color:var(--ok)}

/* ============ the cabinet (play overlay) ============ */
.cab{position:fixed;inset:0;z-index:100;background:color-mix(in srgb,var(--bg) 94%,transparent);
  backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;padding:18px}
.cab[hidden]{display:none}
.cabbox{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  width:min(680px,100%);max-height:calc(100dvh - 36px);display:flex;flex-direction:column;
  overflow:hidden}
.cabtop{display:flex;align-items:center;gap:.8rem;padding:1rem 1.2rem;
  border-bottom:1px solid var(--line);flex:none}
.cabtop h3{font-size:1.15rem;margin-right:auto}
.cabx{background:var(--bg2);border:1px solid var(--line);border-radius:999px;width:38px;height:38px;
  display:grid;place-items:center;color:var(--dim);font-size:1.1rem;flex:none}
.cabx:hover{color:var(--ink);border-color:var(--dim)}
.hud{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap;padding:.8rem 1.2rem;
  border-bottom:1px solid var(--line);flex:none;font-size:.86rem}
.hud .b{background:var(--bg2);border-radius:999px;padding:.3rem .8rem;font-weight:650;white-space:nowrap}
.hud .b b{font-family:var(--disp);font-size:1rem}
.hud .b.h-score b{color:var(--lime-fg)} .hud .b.h-time b{color:var(--cyan-fg)} .hud .b.h-best b{color:var(--yellow-fg)}
.stage{padding:1rem 1.1rem 1.2rem;overflow:auto;flex:1;min-height:0}
.msg{text-align:center;color:var(--dim);font-size:.92rem;margin:.15rem 0 .7rem}
.big{font-family:var(--disp);font-size:clamp(2rem,7vw,3rem);font-weight:700;text-align:center;
  margin:.4rem 0}

/* shared game bits */
.cells{display:grid;gap:.6rem;font-size:1.3rem}
.cell{aspect-ratio:1;border:1px solid var(--line);background:var(--bg2);border-radius:14px;
  font-family:var(--disp);font-size:inherit;line-height:1;font-weight:600;color:var(--ink);
  display:grid;place-items:center;transition:transform .1s ease,background .12s ease}
.cell:hover{background:var(--card2)}
.cell:active{transform:scale(.95)}
.cell.lit{background:var(--cyan);color:#06222B}
.cell.good{background:var(--ok);color:#06251A}
.cell.bad{background:var(--bad);color:#2B0808}
.cell.on{background:var(--yellow);color:#2A1E02}
.cell.sm{font-size:1rem}
.opts{display:grid;grid-template-columns:1fr 1fr;gap:.5rem;margin-top:.7rem}
.opt{border:1px solid var(--line);background:var(--bg2);border-radius:13px;
  padding:clamp(.55rem,1.7vh,.95rem) .8rem;
  font-weight:600;font-size:1rem;text-align:center;transition:background .12s ease}
.opt:hover{background:var(--card2)}
.opt.good{background:var(--ok);color:#06251A;border-color:var(--ok)}
.opt.bad{background:var(--bad);color:#2B0808;border-color:var(--bad)}
.pad{width:100%;min-height:210px;border-radius:18px;border:1px solid var(--line);
  display:grid;place-items:center;font-family:var(--disp);font-size:1.4rem;font-weight:600;
  text-align:center;padding:1rem;background:var(--bg2)}
.pad.wait{background:#5A2233;color:#FFD9E2}
.pad.go{background:var(--ok);color:#06251A}
.pad.early{background:var(--bad);color:#2B0808}
.center{text-align:center}
.mt{margin-top:1.1rem}
.rowbtns{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap;margin-top:1.2rem}
.eq{font-family:var(--disp);font-weight:700;text-align:center;letter-spacing:.02em;
  line-height:1.15;margin:.2rem 0 .5rem}
.keys{display:grid;grid-template-columns:repeat(3,1fr);gap:.45rem;max-width:290px;
  margin:.8rem auto 0}
.key{border:1px solid var(--line);background:var(--bg2);border-radius:13px;
  padding:clamp(.42rem,1.5vh,.8rem);font-family:var(--disp);font-size:1.2rem;font-weight:600}
.key:hover{background:var(--card2)}
.key.wide{grid-column:span 1}
.inp{font-family:var(--disp);font-size:1.7rem;font-weight:700;text-align:center;
  border:1px solid var(--line);background:var(--bg2);border-radius:13px;padding:.35rem;
  width:100%;max-width:290px;margin:0 auto;display:block;color:var(--ink);
  min-height:clamp(42px,6vh,56px);line-height:1.2}
.inp.good{border-color:var(--ok);color:var(--ok-fg)}
.inp.bad{border-color:var(--bad);color:var(--bad-fg)}

/* about + footer */
.about{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(1.8rem,4vw,3rem)}
.about .who{display:flex;gap:1.3rem;align-items:flex-start;flex-wrap:wrap}
.avatar{width:82px;height:82px;border-radius:24px;flex:none;display:grid;place-items:center;
  font-size:2.4rem;background:linear-gradient(140deg,var(--violet),var(--cyan))}
.about p{color:var(--dim);max-width:62ch}
.about p strong{color:var(--ink)}
.tags{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:1.2rem}
.tag{background:var(--bg2);border:1px solid var(--line);border-radius:999px;padding:.35rem .9rem;
  font-size:.85rem;font-weight:600;color:var(--dim)}
.safe{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1rem;margin-top:1.4rem}
.safeitem{background:var(--bg2);border:1px solid var(--line);border-radius:var(--r);padding:1.1rem 1.2rem}
.safeitem b{display:flex;align-items:center;gap:.5rem;font-size:.95rem;margin-bottom:.3rem}
.safeitem b i{color:var(--ok-fg)}
.safeitem span{font-size:.87rem;color:var(--dim)}
footer{border-top:1px solid var(--line);padding-block:2.2rem;margin-top:2rem}
footer .wrap{display:flex;gap:1.2rem;flex-wrap:wrap;align-items:center;font-size:.9rem;color:var(--dim)}
footer .fl{margin-left:auto;display:flex;gap:1.2rem;flex-wrap:wrap}
footer a{color:var(--dim);text-decoration:none}
footer a:hover{color:var(--ink)}
@media(max-width:560px){
  .opts{grid-template-columns:1fr}
  .cab{padding:0}
  .cabbox{border-radius:0;max-height:100dvh;height:100dvh;width:100%}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ---- sudoku ---- */
.sud{display:grid;grid-template-columns:repeat(9,1fr);gap:0;margin:0 auto;font-size:20px;
  max-width:390px;
  border:2.5px solid var(--dim);border-radius:10px;overflow:hidden;background:var(--line)}
.sc{aspect-ratio:1;border:0;background:var(--bg2);color:var(--ink);font-family:var(--disp);
  font-size:inherit;line-height:1;font-weight:600;display:grid;place-items:center;
  border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:0}
.sc:nth-child(9n){border-right:0}
.sc.br{border-right:2.5px solid var(--dim)}
.sc.bb{border-bottom:2.5px solid var(--dim)}
.sc.fixed{color:var(--dim);background:var(--card)}
.sc.sel{background:var(--violet);color:#14102B}
.sc.peer{background:var(--card2)}
.sc.err{color:var(--bad-fg)}
.sc:focus-visible{outline:3px solid var(--yellow);outline-offset:-3px}
.numpad{display:grid;grid-template-columns:repeat(5,1fr);gap:.4rem;max-width:390px;
  margin:.75rem auto 0}
.num{border:1px solid var(--line);background:var(--bg2);border-radius:11px;
  padding:clamp(.35rem,1.1vh,.7rem) 0;
  font-family:var(--disp);font-size:1.15rem;font-weight:600}
.num:hover{background:var(--card2)}
.levels{display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap;margin-bottom:.7rem}
.lvl{border:1px solid var(--line);background:var(--bg2);border-radius:999px;padding:.35rem 1rem;
  font-size:.85rem;font-weight:600;color:var(--dim)}
.lvl[aria-pressed="true"]{background:var(--violet);color:#14102B;border-color:var(--violet)}

/* ---- tic tac toe ---- */
.ttt{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem;max-width:300px;margin:0 auto;font-size:2.6rem}
.tc{aspect-ratio:1;border:1px solid var(--line);background:var(--bg2);border-radius:16px;
  font-family:var(--disp);font-size:inherit;line-height:1;font-weight:700;
  display:grid;place-items:center;color:var(--ink)}
.tc:hover:not(:disabled){background:var(--card2)}
.tc.x{color:var(--cyan-fg)} .tc.o{color:var(--pink-fg)}
.tc.win{background:var(--ok);color:#06251A}
.tally{display:flex;gap:.6rem;justify-content:center;margin-top:1.1rem;flex-wrap:wrap}
.tally span{background:var(--bg2);border-radius:999px;padding:.3rem .85rem;font-size:.85rem;
  font-weight:650;color:var(--dim)}
.tally span b{font-family:var(--disp)}
.gicon{width:34px;height:34px;display:block}
.gcard .emoji{display:block;height:34px}
.gcard.c0 .emoji{color:var(--cyan-fg)} .gcard.c1 .emoji{color:var(--pink-fg)}
.gcard.c2 .emoji{color:var(--lime-fg)} .gcard.c3 .emoji{color:var(--yellow-fg)}
.gcard.c4 .emoji{color:var(--violet-fg)} .gcard.c5 .emoji{color:var(--ok-fg)}
.gcard.c6 .emoji{color:var(--cyan-fg)} .gcard.c7 .emoji{color:var(--pink-fg)}
.cabtop h3{display:flex;align-items:center;gap:.6rem}
.ticon{width:24px;height:24px;flex:none;color:var(--violet-fg)}
.msg.best{color:var(--yellow-fg);font-weight:650}
.sicon{width:20px;height:20px;flex:none;color:var(--ok-fg)}
.avatar svg{width:44px;height:44px;color:#14102B}

/* ---- snake ---- */
.snake{display:grid;gap:2px;max-width:360px;margin:0 auto;background:var(--line);
  border:2px solid var(--line);border-radius:14px;overflow:hidden;touch-action:none}
.sq{aspect-ratio:1;background:var(--bg2)}
.sq.body{background:var(--lime);border-radius:3px}
.sq.head{background:var(--cyan);border-radius:5px}
.sq.food{background:var(--pink);border-radius:50%}
.dpad{display:grid;grid-template-columns:repeat(3,56px);grid-template-rows:repeat(2,52px);
  gap:.45rem;justify-content:center;margin-top:1.1rem}
.dp{border:1px solid var(--line);background:var(--bg2);border-radius:12px;font-size:1.1rem;
  display:grid;place-items:center;color:var(--ink)}
.dp:hover{background:var(--card2)}
.dp.u{grid-column:2} .dp.l{grid-column:1;grid-row:2}
.dp.d{grid-column:2;grid-row:2} .dp.r{grid-column:3;grid-row:2}

/* ---- 2048 ---- */
.g2048{display:grid;grid-template-columns:repeat(4,1fr);gap:.45rem;max-width:330px;margin:0 auto;font-size:1.4rem;
  background:var(--line);padding:.5rem;border-radius:16px;touch-action:none}
.t{aspect-ratio:1;border-radius:11px;display:grid;place-items:center;background:var(--bg2);
  font-family:var(--disp);font-weight:700;font-size:inherit;line-height:1;color:#14102B}
.t.v0{background:var(--bg2)}
.t.v2{background:#EFE7FF} .t.v4{background:#DCD0FF} .t.v8{background:var(--violet);color:#fff}
.t.v16{background:#7C6BE8;color:#fff} .t.v32{background:var(--cyan)} .t.v64{background:#39C6E8}
.t.v128{background:var(--lime)} .t.v256{background:#9BE04A} .t.v512{background:var(--yellow)}
.t.v1024{background:#F79A3E} .t.v2048{background:var(--pink);color:#fff}
.t.big{font-size:clamp(.8rem,3.4vw,1.15rem)}

/* ---- minesweeper ---- */
.mine{display:grid;grid-template-columns:repeat(9,1fr);gap:2px;margin:0 auto;font-size:18px;
  max-width:340px;
  background:var(--line);border:2px solid var(--line);border-radius:12px;overflow:hidden}
.mc{aspect-ratio:1;background:var(--card2);border:0;font-family:var(--disp);font-weight:700;
  font-size:inherit;line-height:1;
  display:grid;place-items:center;color:var(--ink);
  -webkit-user-select:none;user-select:none}
.mc:hover:not(.open){background:var(--line)}
.mc.open{background:var(--bg2);cursor:default}
.mc.flag{background:var(--yellow);color:#2A1E02}
.mc.boom{background:var(--bad);color:#2B0808}
.mc.n1{color:var(--cyan-fg)} .mc.n2{color:var(--lime-fg)} .mc.n3{color:var(--pink-fg)}
.mc.n4{color:var(--violet-fg)} .mc.n5{color:var(--yellow-fg)} .mc.n6{color:var(--ok-fg)}
.mc.n7{color:var(--ink)} .mc.n8{color:var(--dim)}
.mtools{display:flex;gap:.5rem;justify-content:center;margin-top:1rem;flex-wrap:wrap}
.mtool{border:1px solid var(--line);background:var(--bg2);border-radius:999px;padding:.45rem 1rem;
  font-size:.86rem;font-weight:600;color:var(--dim)}
.mtool[aria-pressed="true"]{background:var(--yellow);color:#2A1E02;border-color:var(--yellow)}

/* ---- binary ---- */
.bits{display:grid;grid-template-columns:repeat(4,1fr);gap:.55rem;max-width:280px;
  margin:1.1rem auto 0}
.cabbox:focus{outline:none}
.cabbox:focus-visible{outline:3px solid var(--yellow);outline-offset:-3px}

/* ---- category tabs ---- */
.tabs{display:flex;gap:.35rem;flex-wrap:nowrap;margin:1.2rem 0 1.4rem;
  overflow-x:auto;overflow-y:hidden;scrollbar-width:none;-webkit-overflow-scrolling:touch;
  padding-bottom:.2rem;scroll-snap-type:x proximity}
.tabs::-webkit-scrollbar{display:none}
.tabs .tab{flex:0 0 auto;scroll-snap-align:start}
.tab{border:1px solid var(--line);background:var(--card);border-radius:999px;
  padding:.45rem .7rem;font-weight:600;font-size:.85rem;color:var(--dim);white-space:nowrap;
  display:inline-flex;align-items:center;gap:.4rem;transition:all .14s ease}
.tab:hover{color:var(--ink);border-color:var(--dim)}
.tab[aria-pressed="true"]{background:var(--violet);border-color:var(--violet);color:#14102B}
.tcount{background:rgba(0,0,0,.18);border-radius:999px;padding:0 .38rem;font-size:.72rem;
  font-weight:700;min-width:1.35em;text-align:center}
.tab[aria-pressed="true"] .tcount{background:rgba(255,255,255,.42);color:#14102B}

/* ---- quick instructions ---- */
.how{background:var(--bg2);border:1px solid var(--line);border-radius:12px;
  padding:.45rem .8rem;margin-bottom:.8rem}
.how summary.howhead{font-size:.64rem;letter-spacing:.11em;text-transform:uppercase;
  color:var(--violet-fg);font-weight:700;cursor:pointer;list-style:none;
  display:flex;align-items:center;gap:.4rem}
.how summary::-webkit-details-marker{display:none}
.how summary.howhead::after{content:"+";font-size:.95rem;line-height:1;opacity:.8}
.how[open] summary.howhead::after{content:"\2212"}
.how[open] ol{margin-top:.35rem}
.how ol{counter-reset:step;display:flex;flex-wrap:wrap;gap:.1rem .9rem;list-style:none;
  margin:0;padding:0;flex:1;min-width:0}
.how li{counter-increment:step;font-size:.81rem;color:var(--dim);line-height:1.45}
.how li::before{content:counter(step) ". ";color:var(--violet-fg);font-weight:700}

/* ---- result screen ---- */
.result{position:relative;text-align:center;padding-top:.4rem}
.fx{position:absolute;inset:0 0 auto 0;width:100%;height:180px;pointer-events:none;z-index:0}
.result > *{position:relative;z-index:1}
.result.won .big{color:var(--lime-fg)}
.sad{width:58px;height:58px;color:var(--dim);margin:.3rem auto .6rem;display:block}
.result.lost .msg{color:var(--dim)}

.msg:empty{display:none}

/* ---- cards are links now, so stop them looking like links ---- */
.gcard{text-decoration:none;color:var(--ink)}
.gcard h3{color:var(--ink)}
.gcard p{color:var(--dim)}
.gcard:hover h3{color:var(--ink)}

/* ---- medals ---- */
.medal{border-radius:999px;padding:.16rem .55rem;font-size:.7rem;font-weight:800;
  letter-spacing:.03em;text-transform:capitalize;flex:none}
.medal.bronze{background:#C9784A;color:#2A1408}
.medal.silver{background:#C9CEDA;color:#1C2030}
.medal.gold{background:#F5C64B;color:#2E2101}
.big-medal{font-size:.86rem;padding:.35rem 1rem}
.medalwrap{margin:.6rem 0 .2rem}

/* ---- top score board ---- */
.statrow{display:grid;grid-template-columns:repeat(3,1fr);gap:.8rem;margin:1.3rem 0}
.statbox{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:1rem 1.1rem;text-align:center}
.statbox b{display:block;font-family:var(--disp);font-size:1.9rem;font-weight:700;line-height:1;
  color:var(--lime-fg)}
.statbox span{display:block;font-size:.78rem;color:var(--dim);margin-top:.35rem}
.scores{display:grid;gap:.5rem}
.scorerow{display:flex;align-items:center;gap:.75rem;background:var(--card);
  border:1px solid var(--line);border-radius:14px;padding:.7rem .95rem;
  text-decoration:none;color:var(--ink);transition:border-color .14s ease,background .14s ease}
.scorerow:hover{border-color:var(--violet);background:var(--card2)}
.sicon2{flex:none;color:var(--violet-fg);display:block}
.gicon2{width:24px;height:24px;display:block}
.sname{font-weight:600;font-size:.95rem;min-width:0;overflow-wrap:anywhere}
.sval{margin-left:auto;font-family:var(--disp);font-weight:700;color:var(--yellow-fg);flex:none}
@media(max-width:520px){.statrow{grid-template-columns:1fr;gap:.6rem}
  .statbox{display:flex;align-items:baseline;gap:.7rem;text-align:left}
  .statbox b{font-size:1.5rem}.statbox span{margin:0}}

/* ---- dedicated game page ---- */
.playwrap{padding-block:1.6rem 2.4rem}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r-lg);
  overflow:hidden;display:flex;flex-direction:column;
  max-width:680px;margin:0 auto;max-height:calc(100dvh - 112px)}
.panel .cabtop{flex:none}
.panel .hud{flex:none}
.panel .stage{flex:1;min-height:0;overflow:auto}
.cabx{text-decoration:none}
.playfoot{text-align:center;margin:1.2rem 0 0;font-size:.9rem}
.playfoot a{color:var(--dim);text-decoration:none}
.playfoot a:hover{color:var(--ink)}
@media(max-width:560px){.playwrap{padding-block:.6rem 1rem}
  .panel{border-radius:18px;max-height:calc(100dvh - 84px)}
  .playfoot{margin-top:.7rem}}

/* ---- result banner ---- */
.banner{font-family:var(--disp);font-weight:700;letter-spacing:-.02em;
  font-size:clamp(1.9rem,6vw,2.8rem);line-height:1;margin:.2rem 0 .5rem}
.banner.win{color:var(--lime-fg)}
.banner.lose{color:var(--dim)}
.result.won{animation:pop .45s ease}
.result.lost{animation:shake .45s ease}
@keyframes pop{0%{transform:scale(.9);opacity:0}60%{transform:scale(1.03)}100%{transform:scale(1);opacity:1}}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-9px)}
  40%{transform:translateX(8px)}60%{transform:translateX(-5px)}80%{transform:translateX(3px)}}
.fx{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:0}
.dim2{opacity:.75;font-size:.84rem}

/* short screens: claw back every spare pixel */
@media(max-width:420px){.opt{font-size:.86rem;line-height:1.3;padding:.5rem .55rem}}
@media(max-height:690px){
  .stage{padding:.7rem .9rem .9rem}
  .how{padding:.35rem .7rem;margin-bottom:.55rem}
  .how li{font-size:.77rem}
  .keys{margin-top:.5rem;gap:.35rem}
  .key{padding:.34rem;font-size:1.05rem;border-radius:11px}
  .inp{min-height:38px;font-size:1.35rem;padding:.2rem}
  .opt{padding:.45rem .6rem;font-size:.92rem}
  .opts{gap:.4rem;margin-top:.5rem}
  .msg{margin:.1rem 0 .4rem;font-size:.85rem}
  .eq{margin:.1rem 0 .35rem}
  .numpad{margin-top:.5rem;gap:.32rem}
  .tally{margin-top:.6rem}
  .rowbtns{margin-top:.7rem}
  .levels{margin-bottom:.5rem}
}
.key.wide4{grid-column:span 4}

/* ---- category links ---- */
.tab[aria-current="page"]{background:var(--violet);border-color:var(--violet);color:#14102B}
.tab[aria-current="page"] .tcount{background:rgba(255,255,255,.42);color:#14102B}
a.tab{text-decoration:none}
.pill.igcse{background:#2A2560;color:#B4A0FF}

/* ---- top score on the game page ---- */
.hud .b.h-best{background:color-mix(in srgb,var(--yellow) 16%,var(--bg2));
  border:1px solid color-mix(in srgb,var(--yellow) 34%,transparent);
  display:inline-flex;align-items:center;gap:.45rem}
.hud .b.h-best b{font-size:1.05rem}
.funline{font-family:var(--disp);font-weight:600;font-size:1.05rem;margin:.1rem 0 .5rem;
  color:var(--ink)}
.result.won .funline{color:var(--lime-fg)}
.result.lost .funline{color:var(--pink-fg)}


/* ---- prose pages ---- */
.prose{max-width:66ch}
.prose h1.terms-h1{font-family:var(--disp);font-size:clamp(2rem,5vw,2.8rem);font-weight:700;
  letter-spacing:-.02em;margin:0 0 .6rem}
.prose h2{font-size:1.3rem;margin:2rem 0 .5rem}
.prose p{color:var(--dim);line-height:1.65}
.prose .upd{font-size:.85rem;margin-top:2rem}
.mt2{margin-top:1.6rem}
.mt3{margin-top:1.6rem}
.about h2{margin-bottom:1.4rem}
.cathero{padding-block:clamp(2.2rem,5vw,3.6rem) 1rem}
.cathero h1{font-size:clamp(2.1rem,5.4vw,3.4rem)}
.sep2{color:var(--dim);margin-inline:.3rem}
.about .safeitem b{color:var(--ink)}

/* ---- the correct answer, shown after a wrong one ---- */
.reveal{min-height:1.35rem;margin:.35rem 0 0;text-align:center;font-size:.92rem;
  font-weight:650;color:var(--ok-fg);opacity:0;transition:opacity .15s ease}
.reveal.show{opacity:1}
.reveal:empty{min-height:.5rem}
@media(max-height:690px){.reveal{font-size:.85rem;min-height:1.15rem;margin-top:.25rem}}

/* ---- FAQ page ---- */
.faqcols{display:grid;grid-template-columns:1fr 1fr;gap:2.4rem}
@media(max-width:860px){.faqcols{grid-template-columns:1fr;gap:1.8rem}}
.faqcol h2{display:flex;align-items:center;gap:.6rem;margin-bottom:1rem}
.fico{width:34px;height:34px;border-radius:11px;background:var(--card);border:1px solid var(--line);
  display:grid;place-items:center;color:var(--violet-fg);flex:none}
.fico svg{width:19px;height:19px}
.faq details{border-bottom:1px solid var(--line);padding:.85rem 0}
.faq details:first-of-type{border-top:1px solid var(--line)}
.faq summary{display:flex;justify-content:space-between;gap:1rem;align-items:flex-start;
  cursor:pointer;font-weight:600;list-style:none;font-size:.97rem;line-height:1.4}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.25rem;color:var(--violet-fg);flex:none;line-height:1.1;
  transition:transform .2s ease}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:.6rem 0 0;color:var(--dim);font-size:.92rem;line-height:1.6}

/* ---- theme switch ---- */
.themebtn{background:none;border:1px solid var(--line);border-radius:999px;
  width:38px;height:38px;display:grid;place-items:center;color:var(--dim);cursor:pointer;
  flex:none;padding:0}
.themebtn:hover{color:var(--ink);border-color:var(--dim)}
.themebtn .nico{grid-area:1/1}
/* show the icon for the theme you would switch TO */
.themebtn .sun{display:block}
.themebtn .moon{display:none}
:root[data-theme="light"] .themebtn .sun{display:none}
:root[data-theme="light"] .themebtn .moon{display:block}
/* the IGCSE chip has to work on both grounds */
.pill.igcse{background:var(--chip-bg);color:var(--chip-fg)}

/* ============ touch responsiveness ============
   Without touch-action the browser holds a tap for ~300ms in case it is a
   double tap to zoom, which reads as lag. Tap highlight is replaced with a
   real :active state so feedback is immediate. */
a,button,summary,label,input,select,.task,.cell,.mc,.sc,.tc,.t,.opt,.key,.num,
.chip,.subchip,.tab,.gcard,.scorerow,.paper,.subcard,.dp,.lvl,.mtool,.themebtn{
  touch-action:manipulation;
  -webkit-tap-highlight-color:transparent;
}
button:active,a.gcard:active,.scorerow:active,.paper:active,.subcard:active,
.tab:active,.chip:active,.subchip:active{filter:brightness(1.18)}
.cell:active,.mc:active,.sc:active,.tc:active,.opt:active,.key:active,.num:active,
.dp:active{transform:scale(.96)}
.task:active{background:var(--card2)}

/* Blurred decoration is expensive to composite on a phone, and the sticky
   backdrop filter compounds it. Both go on small screens. */
@media(max-width:820px){
  .blobs{display:none}
  .nav{backdrop-filter:none;background:var(--bg)}
}
@media(prefers-reduced-motion:reduce){
  button:active,.cell:active,.mc:active,.sc:active,.tc:active,.opt:active,
  .key:active,.num:active,.dp:active{transform:none;filter:none}
}