@font-face{font-family:"PctAr";src:url("fonts/ar-regular.woff2") format("woff2");font-weight:400;font-display:swap;unicode-range:U+0600-06FF,U+0750-077F,U+FB50-FDFF,U+FE70-FEFF,U+200C-200F,U+25CC}
@font-face{font-family:"PctAr";src:url("fonts/ar-bold.woff2") format("woff2");font-weight:700;font-display:swap;unicode-range:U+0600-06FF,U+0750-077F,U+FB50-FDFF,U+FE70-FEFF,U+200C-200F,U+25CC}
@font-face{font-family:"PctLat";src:url("fonts/lat-regular.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"PctLat";src:url("fonts/lat-bold.woff2") format("woff2");font-weight:700;font-display:swap}
:root{
  --tq:#007f7a;      /* turquoise (main) */
  --tq2:#14b8ae;     /* turquoise fill */
  --tqL:#dff5f3;     /* turquoise tint */
  --or:#f57c00;      /* orange (main) */
  --orD:#a84f00;     /* orange text */
  --orL:#ffeddb;     /* orange tint */
  --hl:#ffd400;      /* highlight */
  --ink:#17202a; --muted:#3d4a57; --line:#c9d4dc; --bg:#ffffff;
  --r:18px;
  font-size:clamp(17px, 0.55vw + 14px, 26px);
}
html.big{font-size:clamp(21px, 0.7vw + 17px, 32px)}
*{box-sizing:border-box}
html,body{margin:0}
[hidden]{display:none!important}
body{font-family:"PctAr","PctLat",system-ui,"Segoe UI",Tahoma,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;min-height:100vh;display:flex;flex-direction:column;-webkit-text-size-adjust:100%}
[dir="ltr"],.m,.frac,input{font-family:"PctLat","PctAr",system-ui,Arial,sans-serif}
.skip{position:absolute;right:-999px;top:0;background:var(--ink);color:#fff;padding:.5rem 1rem;z-index:9}
.skip:focus{right:0}
:focus-visible{outline:4px solid var(--hl);outline-offset:3px}
button{font:inherit;color:inherit;cursor:pointer}
h1,h2,h3{line-height:1.3;margin:0 0 .6rem}
h1{font-size:2.1rem}
h2{font-size:1.45rem}
h3,.h3{font-size:1.2rem}
p{margin:0 0 .7rem}
mark{background:var(--hl);color:var(--ink);padding:0 .25em;border-radius:6px}

/* ---------- top bar ---------- */
.bar{position:sticky;top:0;z-index:5;background:#fff;border-bottom:3px solid var(--tq);display:flex;gap:.5rem;align-items:center;justify-content:space-between;padding:.45rem max(.6rem, env(safe-area-inset-right)) .45rem max(.6rem, env(safe-area-inset-left));flex-wrap:wrap}
.tools{display:flex;gap:.4rem;flex-wrap:wrap}
.tb{display:inline-flex;align-items:center;gap:.35rem;min-height:48px;padding:.3rem .7rem;border:2px solid var(--tq);border-radius:14px;background:#fff;color:var(--tq);font-weight:700;font-size:.85rem}
.tb[aria-pressed="true"]{background:var(--tq);color:#fff}
.tb-home{background:var(--or);border-color:var(--or);color:var(--ink)}
#tSound[aria-pressed="true"]{background:#fff;color:var(--tq)}
#tSound[aria-pressed="false"]{background:var(--ink);border-color:var(--ink);color:#fff}
.ic{display:inline-flex;width:1.45em;height:1.45em;flex:none}
.ic svg{width:100%;height:100%}

main{flex:1;width:100%;max-width:1100px;margin:0 auto;padding:1rem max(1rem, env(safe-area-inset-right)) 2rem max(1rem, env(safe-area-inset-left))}
main:focus,h1:focus{outline:none}
.page{animation:fade .25s ease}
@keyframes fade{from{opacity:0}to{opacity:1}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------- home ---------- */
.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:1.5rem;align-items:center;margin:.5rem 0 1.5rem}
.kicker{display:inline-block;background:var(--tqL);color:var(--tq);font-weight:700;padding:.15rem .8rem;border-radius:999px;font-size:.9rem}
.hero h1{font-size:2.8rem;color:var(--ink)}
.hero .pct{color:var(--or)}
.lead{font-size:1.2rem}
.hero-svg{width:100%;max-width:340px;display:block;margin:auto}
.big-nav{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1.5rem}
.big-btn{display:flex;align-items:center;gap:1rem;min-height:120px;padding:1rem 1.2rem;border-radius:var(--r);text-decoration:none;font-size:1.25rem;border:3px solid transparent}
.big-btn .num{flex:none;width:2.4em;height:2.4em;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:1.2em;background:#fff;color:var(--ink)}
.big-btn .bt{flex:1;display:flex;flex-direction:column}
.big-btn .bt b{font-size:1.25em;line-height:1.3}
.big-btn .bt small{font-size:.8em;opacity:1}
.big-btn .bi{flex:none;width:3.4em;height:3.4em}
.b-tq{background:var(--tq);color:#fff}
.b-or{background:var(--or);color:var(--ink)}
.b-ink{background:var(--ink);color:#fff}
.big-btn:hover{border-color:var(--hl)}
.big-btn.small{min-height:80px;display:inline-flex}
.next-sec{display:flex;justify-content:flex-start;margin-top:1rem}
.helpbox{border:3px solid var(--tqL);border-radius:var(--r);padding:1rem 1.2rem}
.tool-list{list-style:none;padding:0;margin:0 0 .5rem}
.tool-list li{display:flex;align-items:center;gap:.5rem;margin:.3rem 0}
.tool-list .ic{color:var(--tq)}

/* ---------- read button ---------- */
.read{display:inline-flex;align-items:center;gap:.4rem;min-height:48px;padding:.3rem 1rem;border-radius:999px;border:2px solid var(--tq);background:var(--tqL);color:var(--tq);font-weight:700;font-size:.9rem;margin:.2rem 0 .8rem}
.read.on{background:var(--tq);color:#fff}

/* ---------- section heads & cards ---------- */
.ph{display:flex;align-items:center;gap:.8rem;margin:.3rem 0 1rem}
.ph h1{margin:0}
.ph-num{width:2.4rem;height:2.4rem;flex:none;border-radius:50%;background:var(--or);color:var(--ink);font-weight:700;display:grid;place-items:center;font-size:1.3rem}
.card{border:3px solid var(--line);border-radius:var(--r);padding:1.2rem 1.3rem;margin:0 0 1.4rem;background:#fff}
.card-h{display:flex;align-items:center;gap:.7rem;margin-bottom:.5rem}
.card-h h2{margin:0}
.step-n{width:2.1rem;height:2.1rem;border-radius:12px;background:var(--tq);color:#fff;display:grid;place-items:center;font-weight:700;flex:none}
.term{background:var(--tqL);border-inline-start:6px solid var(--tq);padding:.45rem .8rem;border-radius:10px}
.example,.story{background:var(--orL);padding:.6rem .9rem;border-radius:12px}
.tag{display:inline-block;background:var(--or);color:var(--ink);font-weight:700;border-radius:8px;padding:0 .5rem;margin-inline-end:.4rem;font-size:.85em}
.simple-note{border:3px dashed var(--tq);border-radius:12px;padding:.6rem .9rem;font-weight:700}
.simple-only{display:none}
html.simple .simple-only{display:block}
html.simple .full-only{display:none!important}

/* fractions */
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;line-height:1.1;margin:0 .15em;font-weight:700}
.frac>span:first-child{border-bottom:.12em solid currentColor;padding:0 .2em .05em}
.frac>span:last-child{padding:.05em .2em 0}
.m{white-space:nowrap;font-weight:700;unicode-bidi:isolate}

/* grid 100 */
.grid-wrap{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:1.4rem;align-items:center;margin:.6rem 0 1rem}
.grid100{display:grid;grid-template-columns:repeat(10,1fr);gap:3px;background:var(--ink);border:3px solid var(--ink);border-radius:8px;aspect-ratio:1/1;max-width:440px;width:100%;touch-action:none;user-select:none;-webkit-user-select:none;margin:auto}
.grid100 .cell{background:#fff;position:relative}
.grid100 .cell.on{background:var(--tq2)}
.grid100 .cell.on::after{content:"";position:absolute;inset:30%;border-radius:50%;background:var(--ink);opacity:.55}
.grid100 .cell.target{outline:3px dashed var(--or);outline-offset:-4px}
.grid-info{text-align:center}
.big-read{font-size:1.4rem}
.big-read b{font-size:2.2rem;color:var(--tq)}
.eq-line{font-size:1.6rem;display:flex;justify-content:center;align-items:center;gap:.4rem;flex-wrap:wrap}
.eq-line>b:first-child{color:var(--orD)}
.stepper{display:flex;gap:.5rem;justify-content:center;margin:.6rem 0;flex-wrap:wrap}
.sbtn{min-width:64px;min-height:56px;border-radius:14px;border:3px solid var(--tq);background:#fff;color:var(--tq);font-weight:700;font-size:1.15rem}
.chips{display:flex;gap:.5rem;flex-wrap:wrap;justify-content:center}
.chip{min-height:52px;min-width:64px;padding:.2rem .8rem;border-radius:999px;border:3px solid var(--or);background:#fff;color:var(--ink);font-weight:700;font-size:1.05rem}
.chip[aria-pressed="true"]{background:var(--or)}

/* known percents */
.known{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin:.6rem 0 1rem}
.kn{text-align:center;border:3px solid var(--tqL);border-radius:16px;padding:.8rem .4rem}
.kn svg{width:min(120px,100%);height:auto}
.kn p{margin:.3rem 0 0;font-size:1.15rem}
.kn b{color:var(--orD);font-size:1.25em}

/* triple */
.triple{display:flex;align-items:stretch;justify-content:center;gap:.5rem;flex-wrap:wrap;margin:.6rem 0 1rem}
.tri{border:3px solid var(--tq);border-radius:14px;min-width:6.5rem;padding:.5rem .6rem;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.2rem;font-size:1.6rem}
.tri small{font-size:.75rem;font-family:"PctAr",system-ui,sans-serif;direction:rtl}
.tri.t1{border-color:var(--or)} .tri.t4{border-color:var(--or)}
.eqs{align-self:center;font-size:1.8rem;font-weight:700}
.conv{border-collapse:collapse;margin:.4rem auto;min-width:min(100%,520px);font-size:1.15rem;text-align:center}
.conv caption{font-weight:700;margin-bottom:.3rem}
.conv th,.conv td{border:2px solid var(--line);padding:.4rem .8rem}
.conv th{background:var(--tqL)}

/* steps */
.steps{padding-inline-start:0;list-style:none;counter-reset:st;margin:.8rem 0}
.steps li{counter-increment:st;display:none;position:relative;padding:.5rem 3.3rem .5rem .7rem;min-height:3rem;border:3px solid var(--tqL);border-radius:12px;margin-bottom:.5rem;font-size:1.1rem}
.steps li.show{display:block;animation:fade .3s}
.steps li::before{content:counter(st);position:absolute;right:.6rem;top:.5rem;width:2rem;height:2rem;border-radius:50%;background:var(--or);color:var(--ink);font-weight:700;display:grid;place-items:center;font-family:"PctLat",sans-serif}
.step-ctrl{display:flex;gap:.6rem;flex-wrap:wrap;margin:.4rem 0}
.btn{min-height:52px;padding:.4rem 1.2rem;border-radius:14px;border:3px solid transparent;font-weight:700;font-size:1.05rem}
.btn-or{background:var(--or);color:var(--ink)}
.btn-tq{background:var(--tq);color:#fff}
.btn-line{background:#fff;border-color:var(--tq);color:var(--tq)}
.btn-xl{min-height:64px;font-size:1.25rem;padding:.5rem 1.8rem}
.btn[disabled]{opacity:.45;cursor:default}
.barsvg{width:100%;max-width:640px;display:block;margin:.6rem auto}
.tricks{border:3px solid var(--or);border-radius:16px;padding:.8rem 1rem;margin:1rem 0 .4rem}
.tricks ul{list-style:none;padding:0;margin:0 0 .5rem;display:grid;grid-template-columns:repeat(auto-fit,minmax(11rem,1fr));gap:.4rem}
.tricks li{background:var(--orL);border-radius:10px;padding:.3rem .7rem;font-size:1.1rem}
.machine{background:var(--tqL);border-radius:16px;padding:1rem;margin-top:.8rem}
.mrow{display:flex;align-items:center;gap:.6rem;margin:.5rem 0;flex-wrap:wrap}
.mrow .chips{justify-content:flex-start}
.ml{font-weight:700;min-width:4.5rem}
.mout{background:#fff;border-radius:12px;padding:.7rem 1rem;font-size:1.15rem;min-height:3rem}
.mout .res{font-size:1.4rem;font-weight:700;color:var(--tq)}
.disc-row{display:grid;grid-template-columns:150px 1fr;gap:1rem;align-items:center}
.bagsvg{width:100%}

/* ---------- practice ---------- */
.levels{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem;margin:.3rem 0 1rem}
.lvl{min-height:64px;border-radius:14px;border:3px solid var(--tq);background:#fff;color:var(--tq);display:flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.3;padding:.3rem}
.lvl small{font-size:.8rem}
.lvl[aria-selected="true"]{background:var(--tq);color:#fff}
.qbox .card{border-color:var(--tq)}
.qtop{display:flex;justify-content:space-between;align-items:center;gap:.5rem;flex-wrap:wrap;margin-bottom:.4rem}
.dots{display:flex;gap:.3rem;flex-wrap:wrap;direction:rtl}
.dot{width:1.7rem;height:1.7rem;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-size:.8rem;font-weight:700;background:#fff;font-family:"PctLat",sans-serif}
.dot.cur{border-color:var(--ink);border-width:3px}
.dot.ok{background:var(--tq);border-color:var(--tq);color:#fff}
.dot.no{background:var(--or);border-color:var(--or);color:var(--ink)}
.qt{font-size:1.35rem;font-weight:700}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(10rem,1fr));gap:.7rem;margin:.7rem 0}
.opt{min-height:68px;border-radius:16px;border:3px solid var(--ink);background:#fff;font-size:1.35rem;font-weight:700;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.3rem .8rem}
.opt:hover:not([disabled]){background:var(--tqL)}
.opt[disabled]{cursor:default}
.opt.right{border-color:var(--tq);background:var(--tqL);border-width:4px}
.opt.wrong{border-color:var(--or);background:var(--orL);border-style:dashed;border-width:4px}
.opt .mk{width:1.4em;height:1.4em;display:inline-flex}
.ans-row{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap;margin:.7rem 0}
.ans-row input{width:9rem;min-height:64px;font-size:1.6rem;font-weight:700;text-align:center;border:3px solid var(--ink);border-radius:14px;padding:.2rem .5rem}
.ans-row .unit{font-size:1.3rem;font-weight:700}
.fb{display:flex;gap:.7rem;align-items:flex-start;border-radius:14px;padding:.8rem 1rem;margin:.7rem 0;font-size:1.15rem;border:3px solid}
.fb.ok{border-color:var(--tq);background:var(--tqL)}
.fb.no{border-color:var(--or);background:var(--orL);border-style:dashed}
.fb .fic{flex:none;width:2.4rem;height:2.4rem}
.fb b.w{display:block;font-size:1.25rem}
.hintbox{margin:.5rem 0}
.hint-btn{display:inline-flex;align-items:center;gap:.4rem;min-height:48px;border-radius:999px;border:2px dashed var(--orD);background:#fff;color:var(--orD);font-weight:700;padding:.2rem 1rem;font-size:.95rem}
.hints{list-style:none;padding:0;margin:.5rem 0 0}
.hints li{background:var(--orL);border-radius:10px;padding:.4rem .8rem;margin-bottom:.4rem}
.hints li::before{content:"خطوة " attr(data-n) ": ";font-weight:700}
.qgrid{max-width:300px}
.qnav{display:flex;gap:.6rem;flex-wrap:wrap;justify-content:space-between;margin-top:.6rem}
.score-card{text-align:center}
.score-card .big{font-size:2.6rem;font-weight:700;color:var(--tq)}

/* ---------- game ---------- */
.game-intro{display:grid;grid-template-columns:200px 1fr;gap:1rem;align-items:center}
.basket-svg{width:100%;max-width:220px;display:block;margin:auto}
.basket-svg.sm{max-width:110px;margin:0}
.timer-opt{margin:.6rem 0}
.tgl{display:inline-flex;align-items:center;gap:.6rem;min-height:52px;border:3px solid var(--tq);border-radius:14px;background:#fff;padding:.2rem .9rem;font-weight:700}
.tgl .box{width:1.6rem;height:1.6rem;border:3px solid var(--tq);border-radius:6px;display:grid;place-items:center}
.tgl[aria-pressed="true"] .box::after{content:"";width:.8rem;height:.45rem;border-left:4px solid var(--tq);border-bottom:4px solid var(--tq);transform:rotate(-45deg) translate(1px,-2px)}
.ghead{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.8rem;flex-wrap:wrap}
.gbasket{display:flex;align-items:center;gap:.8rem}
.gfill{font-size:1.3rem;margin:0}
.gfill b{color:var(--tq);font-size:1.5em}
.gmeta p{margin:0;font-size:1.1rem}
.gtime{display:flex;align-items:center;gap:.5rem;margin-top:.3rem}
.tbar{width:9rem;height:1rem;border:2px solid var(--ink);border-radius:999px;overflow:hidden;display:block}
.tbar span{display:block;height:100%;background:var(--or);width:100%;transition:width 1s linear}
.gqt{font-size:1.5rem;font-weight:700}
.gend-t{font-size:1.7rem;font-weight:700}
.best{font-weight:700;color:var(--tq)}
#gEnd{text-align:center}
#gEnd .step-ctrl{justify-content:center}

/* ---------- teacher ---------- */
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));gap:.6rem;margin:0}
.facts div{background:var(--tqL);border-radius:12px;padding:.5rem .8rem}
.facts dt{font-weight:700;color:var(--tq)}
.facts dd{margin:0}
.goals li,.ideas li,.vocab li,.mist li{margin-bottom:.5rem}

/* toast & footer */
.toast{position:fixed;top:5.5rem;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:.8rem 1.2rem;border-radius:14px;max-width:min(92vw,560px);z-index:20;font-size:1rem;text-align:center}
.foot{border-top:3px solid var(--tq);text-align:center;padding:.9rem 1rem calc(.9rem + env(safe-area-inset-bottom));font-weight:700;font-size:1.05rem;color:var(--ink);background:#fff}
.foot p{margin:0}

/* ---------- responsive ---------- */
@media (max-width:760px){
  h1{font-size:1.7rem}
  .hero{grid-template-columns:1fr;gap:.6rem}
  .hero h1{font-size:2.2rem}
  .hero-art{order:-1}
  .hero-svg{max-width:180px}
  .big-nav{grid-template-columns:1fr}
  .big-btn{min-height:96px}
  .grid-wrap{grid-template-columns:1fr}
  .known{grid-template-columns:repeat(2,1fr)}
  .game-intro{grid-template-columns:1fr}
  .game-intro .basket-svg{max-width:150px}
  .disc-row{grid-template-columns:110px 1fr}
  .tb .tl{font-size:.78rem}
  .tb{padding:.25rem .5rem}
  .levels{gap:.4rem}
  .card{padding:1rem}
}
@media (max-width:420px){
  .tb-home .tl,.tb .lg{display:none}
  .big-btn{gap:.6rem;padding:.8rem .9rem;font-size:1.1rem}
  .big-btn .bi{width:2.3em;height:2.3em}
  .big-btn .num{width:2em;height:2em}
  .bar{gap:.3rem;padding-left:.4rem;padding-right:.4rem}
  .tools{gap:.3rem}
  .tb{padding:.2rem .45rem;gap:.25rem}
  .tri{min-width:3.9rem;font-size:1.15rem;padding:.4rem .3rem}
  .tri small{font-size:.62rem}
  .triple{gap:.25rem}
  .eqs{font-size:1.15rem}
  .disc-row{grid-template-columns:1fr}
  .bagsvg{max-width:130px;margin:auto;display:block}
}
@media (min-width:1400px){ main{max-width:1240px} }