@font-face{font-family:Andika;src:url(fonts/Andika-Regular.ttf)}@font-face{font-family:Andika;font-weight:700;src:url(fonts/Andika-Bold.ttf)}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
:root{--deep:#2b1a6b;--violet:#6c3fd1;--pink:#ff4f9a;--mint:#3cc9b4;--lime:#7cc63e;--yellow:#ffd23f;--orange:#ff7a2f;--blue:#2b9dff;--ink:#1f1442}
body{margin:0;font-family:Andika,"Segoe UI",Arial,sans-serif;background:#f3f0ff;background-image:linear-gradient(#e4dcff 1px,transparent 1px),linear-gradient(90deg,#e4dcff 1px,transparent 1px);background-size:28px 28px;color:var(--ink);font-size:18px;line-height:1.35;overflow-x:hidden}
button{font-family:inherit;cursor:pointer;color:inherit}a{color:inherit}
#download-book{position:fixed;top:11px;right:12px;z-index:200;background:var(--yellow);color:#222;font-weight:bold;padding:10px 14px;border-radius:22px;text-decoration:none;box-shadow:0 2px 6px #0003;min-height:44px;display:flex;align-items:center;font-size:15px;white-space:nowrap}
#download-book:hover{background:#ffc400}#download-book .short{display:none}
.top{background:linear-gradient(90deg,var(--deep),#4b2aa8);color:#fff;display:flex;align-items:center;gap:12px;padding:8px 290px 8px 16px;min-height:66px;flex-wrap:nowrap;border-bottom:5px solid var(--pink)}
.brand{color:#fff;text-decoration:none;display:flex;flex-direction:column;line-height:1.05;min-width:0}
.logo{font-weight:700;font-size:27px;white-space:nowrap}.p{color:#9bffea}.y{color:var(--yellow)}
.brand small{color:#d9ccff;font-size:14px;margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.stk{margin-left:auto;background:#ffffff1f;border:2px solid #ffffff55;border-radius:22px;padding:8px 14px;text-decoration:none;color:#fff;font-size:16px;min-height:44px;display:flex;align-items:center;gap:4px;white-space:nowrap;flex:none}
main{max-width:1040px;margin:0 auto;padding:14px 12px 40px}
footer{text-align:center;color:#55497a;font-size:14px;padding:6px 12px 40px}footer div{font-weight:700;font-size:16px;color:var(--ink)}footer p{margin:4px}
.art svg,.ic svg{width:100%;height:100%;display:block}
/* home */
.hero{background:linear-gradient(150deg,#2b1a6b 0%,#5a32c4 55%,#ff4f9a 130%);color:#fff;border-radius:24px;padding:22px 24px;display:grid;grid-template-columns:1.3fr 1fr;gap:16px;align-items:center;position:relative;overflow:hidden}
.hero:before{content:"× ÷ + × = × 12 × 7 ×";position:absolute;right:-20px;bottom:6px;font-size:54px;font-weight:700;color:#ffffff12;white-space:nowrap}
.hero h1{margin:0;font-size:40px;line-height:1.05}.hero h1 .y{display:block}
.hero .tag{display:inline-block;background:var(--yellow);color:#222;font-weight:700;border-radius:14px;padding:4px 12px;margin:10px 0 4px}
.hero p{margin:6px 0;font-size:18px;color:#efe8ff}
.hero .mascot{width:min(250px,100%);justify-self:center;animation:bob 3s ease-in-out infinite;filter:drop-shadow(0 8px 10px #0005)}
@keyframes bob{50%{transform:translateY(-10px) rotate(2deg)}}
.bigbtn{display:inline-block;background:var(--yellow);color:#222;border:none;border-radius:30px;padding:14px 26px;font-size:22px;font-weight:700;box-shadow:0 4px 0 #c99a00;margin-top:10px;text-decoration:none}
.bigbtn:active{transform:translateY(3px);box-shadow:0 1px 0 #c99a00}
.how{background:#fff;border-radius:18px;padding:14px 18px;margin:18px 0;box-shadow:0 2px 8px #0001}.how h2{margin:0 0 8px;color:var(--violet);font-size:22px}
.howg{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.howg div{background:#f4efff;border-radius:14px;padding:10px;text-align:center;font-size:15px}.howg b{display:block;font-size:30px}
h2.sec{color:var(--deep);margin:20px 4px 10px;font-size:24px}
.acts{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.act{background:#fff;border-radius:20px;padding:14px;text-decoration:none;display:flex;gap:12px;align-items:center;box-shadow:0 3px 0 var(--c),0 4px 12px #0001;border:3px solid var(--c);transition:transform .15s;min-height:104px}
.act:hover{transform:translateY(-3px)}.act .ic{width:70px;height:70px;flex:none}
.act h3{margin:0;font-size:20px;color:var(--c)}.act p{margin:2px 0 0;font-size:15px;color:#4d4470}.act .n{font-size:13px;font-weight:700;color:#fff;background:var(--c);border-radius:10px;padding:1px 8px}
/* page header */
.ph{display:flex;align-items:center;gap:10px;margin:4px 0 12px;flex-wrap:wrap}
.ph h1{margin:0;font-size:28px;color:var(--deep);flex:1;min-width:180px}
.back{background:#fff;border:3px solid var(--violet);color:var(--violet);border-radius:22px;padding:8px 16px;font-size:17px;font-weight:700;text-decoration:none;min-height:46px;display:inline-flex;align-items:center}
.btn{background:var(--violet);color:#fff;border:none;border-radius:22px;padding:10px 18px;font-size:18px;font-weight:700;min-height:48px;box-shadow:0 3px 0 #43228f}
.btn:active{transform:translateY(2px);box-shadow:0 1px 0 #43228f}
.btn.o{background:var(--orange);box-shadow:0 3px 0 #b5501a}.btn.y{background:var(--yellow);color:#222;box-shadow:0 3px 0 #c99a00}.btn.g{background:#22a861;box-shadow:0 3px 0 #13703f}.btn.p{background:var(--pink);box-shadow:0 3px 0 #b8306c}.btn.w{background:#fff;color:var(--violet);border:2px solid #cfc2f5;box-shadow:0 3px 0 #c8bdf0}
.btn[disabled]{opacity:.45}
.panel{background:#fff;border-radius:22px;padding:16px;box-shadow:0 3px 12px #0001}
.score{background:#fff;border-radius:16px;padding:6px 14px;font-weight:700;color:var(--deep);font-size:18px}
.info{margin:0 0 12px;color:#4d4470;font-size:17px}
.ctrl{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:14px}
/* table picker */
.strip{display:flex;gap:6px;overflow-x:auto;padding:4px 2px 10px;scrollbar-width:thin}
.strip button{flex:none;width:48px;height:48px;border-radius:14px;border:2px solid #d6caf7;background:#fff;font-size:22px;font-weight:700;color:var(--deep)}
.strip button.on{background:var(--pink);border-color:var(--pink);color:#fff}
.pick{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;margin:6px 0 12px}
.pick button{width:50px;height:50px;border-radius:14px;border:3px solid #d6caf7;background:#fff;font-size:21px;font-weight:700}
.pick button.on{background:var(--mint);border-color:#1f9c89;color:#fff}
/* learn */
.learn{display:grid;grid-template-columns:300px 1fr;gap:16px;align-items:start}
.facts{display:grid;gap:6px}
.fact{display:flex;justify-content:space-between;align-items:center;background:#fff;border:3px solid #e2d9fb;border-radius:14px;padding:6px 14px;font-size:24px;font-weight:700;min-height:46px;text-align:left}
.fact .eq{color:#8a7fb0}.fact.on{border-color:var(--pink);background:#fff0f7}.fact.hl{background:var(--yellow);border-color:#e0a800}
.show{background:#fff;border-radius:22px;padding:16px;border:4px solid #e2d9fb;text-align:center;position:sticky;top:10px}
.show .big{font-size:54px;font-weight:700;color:var(--deep);line-height:1.1}.show .big b{color:var(--pink)}
.show .say{font-size:20px;color:#4d4470;margin:4px 0 10px}
.arr{display:flex;flex-direction:column;gap:8px;align-items:center;margin:10px 0}
.grp{display:flex;gap:6px;align-items:center;background:#f4efff;border-radius:14px;padding:6px 10px}
.grp i{width:28px;height:28px;border-radius:50%;background:var(--c,#7c3aed);display:block;box-shadow:inset 0 -3px 0 #0002}
.grp span{font-size:15px;font-weight:700;color:#8a7fb0;min-width:28px}
/* count */
.track{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin:10px 0}
.stone{aspect-ratio:1;border-radius:50%;background:#fff;border:5px solid #d6caf7;display:flex;align-items:center;justify-content:center;font-size:36px;font-weight:700;color:var(--deep);transition:transform .15s,background .15s}
.stone.hl{background:var(--yellow);border-color:#e0a800;transform:scale(1.12)}.stone.done{background:#e8fff3;border-color:#22a861}
.stone.hide span{visibility:hidden}.stone.hide.done span,.stone.hide.hl span{visibility:visible}
.bot{width:120px;height:120px;margin:0 auto}
/* q + keypad */
.qcard{text-align:center}
.qtop{display:flex;gap:6px;justify-content:center;margin-bottom:10px;flex-wrap:wrap}.qtop i{width:22px;height:22px;border-radius:50%;background:#e2d9fb;display:inline-block}.qtop i.ok{background:var(--yellow)}.qtop i.no{background:#ff9aa8}.qtop i.cur{outline:3px solid var(--violet)}
.qq{font-size:64px;font-weight:700;color:var(--deep);margin:4px 0 10px;line-height:1.1}
.ansbox{display:inline-block;min-width:120px;border-bottom:6px solid var(--pink);color:var(--pink)}
.ansbox.ok{color:#22a861;border-color:#22a861}.ansbox.no{color:#e23b5a;border-color:#e23b5a;animation:shake .4s}
.pad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;max-width:330px;margin:0 auto}
.pad button{min-height:64px;border-radius:18px;border:3px solid #d6caf7;background:#fff;font-size:32px;font-weight:700;box-shadow:0 3px 0 #d6caf7}
.pad button:active{transform:translateY(2px)}.pad .ok{background:#22a861;border-color:#22a861;color:#fff;box-shadow:0 3px 0 #13703f}.pad .del{background:#fff0f7}
.msg{font-weight:700;font-size:22px;min-height:32px;margin:6px 0;color:var(--violet)}
.opts{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;max-width:520px;margin:0 auto}
.opt{background:#fff;border:4px solid #d6caf7;border-radius:20px;min-height:90px;font-size:44px;font-weight:700;color:var(--deep);display:flex;align-items:center;justify-content:center}
.opt.ok{border-color:#22a861;background:#e3f9ec}.opt.no{border-color:#ff5d73;background:#ffe9ec;animation:shake .4s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.stars{font-size:64px;letter-spacing:6px;margin:6px 0}.stars .off{filter:grayscale(1);opacity:.3}
.result{text-align:center}.result h2{font-size:32px;color:var(--deep);margin:6px 0}.result .art{width:150px;height:150px;margin:0 auto}
.timer{font-size:30px;font-weight:700;color:var(--orange)}.bar{height:16px;border-radius:8px;background:#ffe3d3;overflow:hidden;margin:6px auto 10px;max-width:520px}.bar div{height:100%;background:var(--orange);transition:width .25s linear}
/* match */
.mgrid{display:grid;grid-template-columns:1fr 1fr;gap:12px 24px;max-width:620px;margin:0 auto}
.mcol{display:grid;gap:10px}
.mi{min-height:70px;border-radius:18px;border:4px solid #d6caf7;background:#fff;font-size:32px;font-weight:700;color:var(--deep)}
.mi.sel{border-color:var(--pink);background:#fff0f7}.mi.done{border-color:#22a861;background:#e3f9ec;color:#22a861}.mi.no{animation:shake .4s;border-color:#ff5d73}
/* stories */
.slist{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.scard{background:#fff;border:3px solid #e2d9fb;border-radius:18px;padding:8px;text-align:center;font-weight:700;font-size:16px}
.scard .art{width:60px;height:60px;margin:0 auto 4px}.scard.got{border-color:var(--yellow);background:#fffbea}.scard small{display:block;color:#8a7fb0;font-weight:400}
.story{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
.stext{font-size:27px;line-height:1.5;background:#fff;border-radius:20px;padding:16px;border:4px solid #e2d9fb}
.w.hl{background:var(--yellow);border-radius:6px}
.spic{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;background:#fff;border-radius:20px;padding:12px;border:4px solid #e2d9fb}
.sg{display:flex;flex-wrap:wrap;gap:2px;justify-content:center;border:3px dashed #cfc2f5;border-radius:14px;padding:5px;max-width:132px}
.sg .art{width:26px;height:26px}.sg.box{width:80px;height:80px;align-items:center;font-size:30px;font-weight:700;color:var(--violet);flex-direction:column;gap:0}.sg.box .art{width:34px;height:34px}
.explain{font-size:24px;font-weight:700;color:#22a861;text-align:center;min-height:34px;margin-top:8px}
/* grid */
.ggrid{display:grid;grid-template-columns:repeat(13,1fr);gap:3px;max-width:700px;margin:0 auto;user-select:none}
.ggrid div{aspect-ratio:1;display:flex;align-items:center;justify-content:center;background:#fff;border-radius:6px;font-weight:700;font-size:clamp(11px,2.2vw,20px);cursor:pointer}
.ggrid .hd{background:var(--deep);color:#fff;cursor:default}.ggrid .hd.c0{background:var(--pink)}
.ggrid .in{background:#efe8ff}.ggrid .tb{background:#dff8f3}.ggrid .sq{background:#fff3c4}.ggrid .sel{background:var(--pink);color:#fff}
.ggrid.hide div.cell span{visibility:hidden}.ggrid.hide div.cell.open span{visibility:visible}
.gfact{text-align:center;font-size:40px;font-weight:700;color:var(--deep);min-height:56px}.gfact b{color:var(--pink)}
.seg{display:flex;background:#fff;border-radius:22px;padding:4px;gap:4px;flex-wrap:wrap;justify-content:center}.seg button{border:none;background:none;border-radius:18px;padding:8px 12px;font-size:17px;font-weight:700;color:var(--violet);min-height:44px}.seg button.on{background:var(--violet);color:#fff}
/* teacher */
.tboard{background:var(--deep);color:#fff;border-radius:26px;padding:20px;text-align:center;min-height:56vh;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:10px;border:8px solid #4b2aa8}
.tboard .tq{font-size:clamp(64px,14vw,170px);font-weight:700;line-height:1}.tboard .tq b{color:var(--yellow)}.tboard .tq .h{color:#ffffff33}
.tboard .tw{font-size:24px;color:#d9ccff}
.tboard:fullscreen{border-radius:0;border:none}
/* stickers */
.chart{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px}
.slot{background:#fff;border-radius:18px;border:3px dashed #cfc2f5;text-align:center;padding:6px;min-height:140px}
.slot .art{width:90px;height:90px;margin:2px auto;filter:grayscale(1) opacity(.2)}.slot b{font-size:17px;color:#a99fca}
.slot.got{border:3px solid var(--yellow);background:#fffbea}.slot.got .art{filter:none}.slot.got b{color:var(--deep)}
.trophies{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin:10px 0 18px}
.tro{background:#fff;border-radius:16px;padding:10px;text-align:center;border:3px dashed #cfc2f5;color:#a99fca;font-weight:700}.tro span{display:block;font-size:40px;filter:grayscale(1);opacity:.35}
.tro.got{border:3px solid var(--yellow);color:var(--deep);background:#fffbea}.tro.got span{filter:none;opacity:1}
#toast{visibility:hidden;position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(120px);background:var(--deep);color:#fff;padding:12px 20px;border-radius:20px;font-weight:700;z-index:300;transition:transform .3s;max-width:90vw;text-align:center}
#toast.on{visibility:visible;transform:translateX(-50%) translateY(0)}
.confetti{position:fixed;top:-40px;font-size:30px;z-index:350;animation:fall 2.4s ease-in forwards;pointer-events:none}@keyframes fall{to{transform:translateY(110vh) rotate(360deg)}}
@media (max-width:760px){
 #download-book .long{display:none}#download-book .short{display:inline}
 .top{padding:8px 96px 8px 12px;gap:8px}.logo{font-size:20px}.brand small{font-size:12px}.stk .lbl{display:none}.stk{padding:6px 10px}
 .hero{grid-template-columns:1fr;text-align:center;padding:18px}.hero h1{font-size:31px}.hero .mascot{width:150px;grid-row:1}
 .howg{grid-template-columns:repeat(2,1fr)}
 .learn,.story{grid-template-columns:1fr}.show{position:static}.facts{grid-template-columns:1fr 1fr}.fact{font-size:19px;padding:6px 8px}
 .show .big{font-size:40px}.grp i{width:16px;height:16px}.grp{gap:4px;padding:5px 7px}
 .track{grid-template-columns:repeat(4,1fr);gap:8px}.stone{font-size:26px;border-width:4px}
 .qq{font-size:48px}.pad button{min-height:56px;font-size:28px}
 .opt{min-height:76px;font-size:36px}.mi{font-size:26px;min-height:60px}
 .stext{font-size:22px}.ph h1{font-size:23px}
 .tboard{min-height:46vh}
}
@media (max-width:380px){.logo{font-size:18px}.brand small{display:none}}