[hidden]{display:none!important}
:root{--p:#1565E0;--v:#1E7BFF;--k:#FF8A00;--navy:#0B3D91;--blue:#1E7BFF;--cyan:#22C7F5;--g:#3CC84A;--o:#FFA500;--ink:#0B2A66;--bg:#EEF6FF;--grad:linear-gradient(135deg,#0B3D91,#1E7BFF 62%,#22C7F5);
--st:env(safe-area-inset-top,0px);--sb:env(safe-area-inset-bottom,0px)}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);font-family:"Varela Round",Rubik,system-ui,sans-serif;overscroll-behavior:none}
button,textarea,input{font:inherit}
#app{display:flex;flex-direction:column;height:100dvh;max-width:640px;margin:0 auto;background:var(--bg)}
.top{display:flex;align-items:center;gap:12px;padding:calc(var(--st) + 10px) 14px 12px;background:var(--grad);color:#fff;box-shadow:0 4px 18px #1e7bff40;position:relative;z-index:2}
.top .av{width:46px;height:46px;border-radius:50%;background:#fff;padding:2px;box-shadow:0 0 0 2px #ffffff80}
.who{flex:1;min-width:0}.name{font-family:Rubik;font-weight:700;font-size:18px;display:flex;align-items:center;gap:6px}
.dot{width:9px;height:9px;border-radius:50%;background:#3CC84A;box-shadow:0 0 0 2px #ffffff60}
.sub{font-size:12.5px;opacity:.9;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.icon-btn{background:#ffffff26;border:0;color:inherit;width:40px;height:40px;border-radius:50%;font-size:20px;display:grid;place-items:center;cursor:pointer}
.banner{background:#FEF3C7;color:#92400E;font-size:13px;padding:7px 14px;text-align:center;border-bottom:1px solid #FDE68A}
main{flex:1;overflow-y:auto;padding:16px 12px 8px;display:flex;flex-direction:column;gap:10px;-webkit-overflow-scrolling:touch}
.row{display:flex;gap:8px;align-items:flex-end;animation:pop .22s ease-out}
.row.me{flex-direction:row-reverse}
.row .mini{width:30px;height:30px;border-radius:50%;background:#fff;flex:none;box-shadow:0 1px 4px #0001}
.row>div{max-width:84%;display:flex;flex-direction:column}.me>div{align-items:flex-end}.bubble{max-width:100%;padding:10px 14px;border-radius:20px;line-height:1.6;font-size:15.5px;word-wrap:break-word;white-space:pre-wrap;overflow-x:auto}
.bot .bubble{background:#fff;border-bottom-right-radius:6px;box-shadow:0 1px 3px #0b2a6614}
.me .bubble{background:var(--grad);color:#fff;border-bottom-left-radius:6px}
.bubble img{max-width:100%;border-radius:12px;display:block;margin-bottom:6px}
.bubble .katex-display{margin:.5em 0;direction:ltr;overflow-x:auto;overflow-y:hidden}
.bubble .katex{direction:ltr;unicode-bidi:isolate}
.bubble.err{background:#FEE2E2;color:#991B1B}
.time{font-size:10.5px;opacity:.55;margin-top:3px}
.typing .bubble{display:flex;gap:5px;padding:14px 16px}
.typing i{width:8px;height:8px;border-radius:50%;background:var(--v);opacity:.4;animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25;transform:translateY(0)}40%{opacity:1;transform:translateY(-4px)}}
@keyframes pop{from{opacity:0;transform:translateY(6px)}}
.chips{display:flex;gap:8px;overflow-x:auto;padding:6px 12px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chips button{flex:none;border:1.5px solid #BFDcff;background:#fff;color:var(--p);border-radius:999px;padding:7px 14px;font-size:14px;font-weight:500;cursor:pointer}
.chips button:active{background:#E6F1FF}
.preview{position:relative;margin:0 12px 6px;width:72px}
.preview img{width:72px;height:72px;object-fit:cover;border-radius:12px;border:2px solid var(--v)}
.preview button{position:absolute;top:-8px;left:-8px;width:24px;height:24px;border-radius:50%;border:0;background:var(--ink);color:#fff;font-size:12px}
.composer{display:flex;align-items:flex-end;gap:8px;padding:8px 10px calc(var(--sb) + 10px);background:#fff;border-top:1px solid #D8E9FF}
.composer .cam{background:#E6F1FF;color:var(--p);flex:none;width:44px;height:44px}
textarea{flex:1;resize:none;border:1.5px solid #D8E9FF;border-radius:22px;padding:10px 14px;max-height:120px;min-height:44px;outline:none;background:#FAFCFF;font-size:16px;line-height:1.4}
textarea:focus{border-color:var(--p)}
.send{flex:none;width:44px;height:44px;border-radius:50%;border:0;background:var(--grad);color:#fff;display:grid;place-items:center;cursor:pointer;box-shadow:0 3px 10px #1e7bff55}
.send:disabled{opacity:.45}
.sheet,.gate{position:fixed;inset:0;background:#0b2a6680;display:flex;align-items:flex-end;justify-content:center;z-index:10}
.gate{align-items:center;background:var(--grad)}
.card{background:#fff;width:100%;max-width:460px;border-radius:24px 24px 0 0;padding:20px 20px calc(var(--sb) + 20px);display:flex;flex-direction:column;gap:10px}
.gate .card{border-radius:24px;margin:20px;text-align:center;align-items:stretch}
.card h2,.card h3{font-family:Rubik;margin:4px 0}
.card p{margin:0;color:#4B5563}
.card button{border:0;background:#F0F7FF;padding:13px;border-radius:14px;font-size:16px;text-align:right;cursor:pointer}
.card .primary{background:var(--grad);color:#fff;text-align:center;font-weight:700}
.card .ghost{background:none;text-align:center;color:#6B7280}
.card input{border:1.5px solid #D8E9FF;border-radius:14px;padding:13px;font-size:17px;text-align:center}
.av.big{width:96px;height:96px;margin:0 auto}
.err{color:#DC2626;font-size:14px;min-height:1em}
.buy{color:var(--v);font-size:14px}
.welcome{text-align:center;color:#6B7280;font-size:12.5px;margin:2px 0 6px}
.view{flex:1;display:flex;flex-direction:column;min-height:0}
.scroll{overflow-y:auto;padding:16px 14px 20px;gap:12px}
.tabs{display:flex;background:#fff;border-top:1px solid #D8E9FF;padding-bottom:var(--sb)}
.tabs button{flex:1;border:0;background:none;padding:6px 0 8px;font-size:12px;color:#6B7280;display:flex;flex-direction:column;align-items:center;gap:1px;cursor:pointer}
.tabs button span{font-size:20px}.tabs button.on{color:var(--p);font-weight:700}
.composer{padding-bottom:10px}
.topicbar{display:flex;align-items:center;gap:8px;padding:8px 14px;background:#E6F1FF;font-size:13px;color:var(--ink);border-bottom:1px solid #D8E9FF}
.topicbar b{color:var(--p)}.topicbar .mbar{flex:none;width:60px}
.mbar{height:8px;border-radius:9px;background:#D8E9FF;overflow:hidden}.mbar i{display:block;height:100%;background:var(--grad);border-radius:9px}
.panel{background:#fff;border-radius:18px;padding:14px;box-shadow:0 1px 4px #0b2a6610}
.panel h3{font-family:Rubik;margin:0 0 8px;font-size:16px}
.next{background:var(--grad);color:#fff}.next h3{color:#fff}.next .btn{background:#fff;color:var(--p)}
.btn{border:0;border-radius:12px;padding:10px 14px;font-weight:700;cursor:pointer;background:var(--grad);color:#fff;font-size:15px}
.trow{display:grid;grid-template-columns:1fr 90px 38px;align-items:center;gap:8px;padding:9px 0;border-bottom:1px solid #EAF3FF;font-size:14.5px}
.trow:last-child{border:0}.trow small{display:block;color:#6B7280;font-size:12px}
.trow .pct{font-size:12.5px;color:#6B7280;text-align:left}
.tag{display:inline-block;font-size:11px;border-radius:8px;padding:1px 7px;margin-inline-start:4px;vertical-align:middle}
.tag.weak{background:#FFF1DC;color:var(--k)}.tag.due{background:#FEF3C7;color:#92400E}.tag.now{background:#D8E9FF;color:var(--p)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;text-align:center}
.stats div{background:#F0F7FF;border-radius:14px;padding:10px 4px}.stats b{display:block;font-family:Rubik;font-size:22px;color:var(--p)}
.stats span{font-size:12px;color:#6B7280}
.onb .card{max-height:90dvh;overflow-y:auto}
.opts{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.opts.two{grid-template-columns:1fr 1fr}.opts.one{grid-template-columns:1fr}
.card .opt{text-align:center;background:#F0F7FF;border:2px solid transparent;padding:11px 6px;font-size:15px}
.card .opt.sel{border-color:var(--p);background:#E6F1FF;color:var(--p);font-weight:700}
.steps{display:flex;gap:6px;justify-content:center}.steps i{width:24px;height:5px;border-radius:5px;background:#D8E9FF}.steps i.on{background:var(--v)}
.lbl{font-weight:700;font-size:14px;margin-top:6px;text-align:right}
.qopt{text-align:right!important}.qopt.ok{background:#DCFCE7!important;border-color:#16A34A!important}.qopt.bad{background:#FEE2E2!important;border-color:#DC2626!important}
.qtext{font-size:18px;line-height:1.6;margin:6px 0}
.toast{position:fixed;top:calc(var(--st) + 80px);left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:9px 16px;border-radius:999px;font-size:14px;z-index:20;animation:pop .2s}
/* ---- stages (fraction-kingdom DNA) */
#stagesView{background:linear-gradient(160deg,#DDEEFF,#CFFAFE 50%,#FEF3C7)}
.kingdom{display:flex;flex-direction:column;gap:10px}
.kingdom>h2{font-family:Rubik;font-weight:800;color:#0B3D91;text-align:center;margin:0;font-size:24px}
.kingdom>p{text-align:center;margin:0;color:#475569;font-size:14px}
.kingdom select{border:2.5px solid var(--ink);border-radius:14px;padding:8px;font:inherit;background:#fff}
.modes{display:flex;gap:6px;justify-content:center;flex-wrap:wrap}
.modes button,.pill{border:2.5px solid var(--ink);background:#fff;border-radius:14px;padding:7px 11px;font-weight:700;font-size:14px;box-shadow:0 3px 0 var(--ink);cursor:pointer}
.modes button.on{background:#22C7F5}.pill.on{background:#1E7BFF;color:#fff}.pill:disabled{opacity:.4}
.sticker{background:#fff;border:3px solid var(--ink);border-radius:24px;padding:14px;box-shadow:0 5px 0 #0b2a6622}
.sticker h3{font-family:Rubik;margin:6px 0}.ctr{text-align:center}
.fr{display:inline-flex;flex-direction:column;align-items:center;font-family:Rubik;font-weight:800;font-size:26px;color:#1E7BFF;line-height:1.1;vertical-align:middle}
.fr i{display:block;width:1.4em;height:3px;background:currentColor;margin:2px 0}
.mc .fr{font-size:22px;color:var(--ink)}
.dots{display:flex;gap:5px;justify-content:center}.dots span{width:26px;height:26px;border:2px solid var(--ink);border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700}.dots span.on{background:#1E7BFF;color:#fff}
.lesson{display:flex;flex-direction:column;align-items:center;text-align:center;gap:8px}.lesson .big{font-size:40px}.lesson p{color:#475569;line-height:1.6;margin:0}
.vis{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:22px;line-height:1.3}.emo{font-size:26px;text-align:center}
.nav{display:flex;justify-content:space-between;gap:8px;margin-top:10px}.nav .pill.on:only-child{margin-inline-start:auto}
.lvl{display:flex;justify-content:space-between;font-size:12px;border:2px solid var(--ink);border-radius:12px;padding:5px 9px;margin:6px 0}
.bar{height:9px;border:2px solid var(--ink);border-radius:9px;overflow:hidden}.bar i{display:block;height:100%;background:#1E7BFF}
.sthead{display:flex;justify-content:space-between;align-items:center}.badge{background:#FFA500;color:#fff;border:2px solid var(--ink);border-radius:12px;padding:3px 9px;font-weight:700;font-size:13px}
.path{display:flex;flex-wrap:wrap;gap:5px;margin:6px 0}.path button{border:2px solid var(--ink);background:#fff;border-radius:11px;min-width:40px;padding:4px 6px;font-size:12px;font-weight:700}
.path button.on{background:#FFA500;color:#fff}.path button.lock{opacity:.45}
.mc{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:8px}
.mc button{border:3px solid var(--ink);border-radius:18px;background:#fff;padding:12px 6px;font-size:19px;font-weight:700;cursor:pointer;min-height:64px}
.mc button.ok{background:#3CC84A}.mc button.bad{background:#FCA5A5}
.res{font-weight:700;font-size:17px;margin:10px 0 6px}
.explain{border:2.5px solid var(--ink);border-radius:16px;padding:10px;font-size:14px;line-height:1.6}
.fb{border:3px solid var(--ink);border-radius:16px;padding:10px;text-align:center;font-weight:700}.fb.ok{background:#BBF7D0}.fb.bad{background:#FECACA}
.tap svg path{cursor:pointer}
.choc{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;max-width:300px;margin:8px auto}.choc button{font-size:28px;border:2.5px solid var(--ink);border-radius:12px;background:#FEF3C7;padding:6px 0;opacity:.45}.choc button.on{opacity:1;background:#D97706}
.scores{width:100%;border-collapse:collapse;font-size:14px}.scores td,.scores th{border-bottom:1.5px solid #E5E7EB;padding:7px 4px;text-align:right}.scores .g{color:#16A34A;font-weight:700}.scores .r{color:#DC2626;font-weight:700}
.askAlon{align-self:center;display:flex;align-items:center;gap:8px;border:3px solid var(--ink);background:#fff;border-radius:999px;padding:6px 16px 6px 8px;font-weight:700;box-shadow:0 3px 0 var(--ink);cursor:pointer}
.askAlon img{width:34px;height:34px}
/* ---- voice */
.inwrap{flex:1;position:relative;display:flex}.inwrap textarea{flex:1}
.rechint{position:absolute;inset:0;border-radius:22px;background:#FFF6E8;border:1.5px solid var(--k);color:var(--k);display:none;align-items:center;padding:0 14px;font-size:15px;font-weight:500;overflow:hidden;white-space:nowrap;z-index:1}
.recording .rechint{display:flex}
.mic{flex:none;width:44px;height:44px;border-radius:50%;border:0;background:#FFF1DC;color:var(--k);display:grid;place-items:center;cursor:pointer;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}
.recording .mic{background:var(--k);color:#fff;transform:scale(1.18);box-shadow:0 0 0 8px #ff8a0033;animation:pulse 1s infinite}
.transcribing .mic{opacity:.5}
@keyframes pulse{50%{box-shadow:0 0 0 14px #ff8a0011}}
.speaking .top .av{animation:talk .5s infinite alternate}@keyframes talk{to{box-shadow:0 0 0 5px #ffffffaa}}
.top .icon-btn{flex:none}
.guide{display:flex;align-items:center;gap:8px;margin-bottom:8px}.guide img{width:44px;height:44px;flex:none}
.guide .say{flex:1;background:#F0F7FF;border:2.5px solid var(--ink);border-radius:16px 16px 16px 4px;padding:7px 10px;font-size:14px;line-height:1.4}
.guide .say .fr{font-size:16px}.guide .hear{flex:none;border:2px solid var(--ink);background:#fff;border-radius:50%;width:34px;height:34px;font-size:15px}
.trial-note{position:fixed;top:0;inset-inline:0;z-index:50;background:#fff4d6;color:#6b4d00;font-size:13px;text-align:center;padding:4px 8px;cursor:pointer}
.legal-links{font-size:12px;text-align:center;margin:8px 0 0}.legal-links a{color:inherit;opacity:.75}

/* ================= redesign: playful Alon ================= */
html,body{background:radial-gradient(120% 70% at 50% -10%,#D9ECFF 0,#EEF6FF 55%,#F6FAFF 100%) fixed}
#app{background:transparent;position:relative;z-index:1}
h1,h2,h3,.name,.wordmark{font-family:Rubik,"Varela Round",sans-serif}
/* floating math symbols */
.bg-math{position:fixed;inset:0;overflow:hidden;pointer-events:none;z-index:0}
.bg-math span{position:absolute;bottom:-60px;font:800 34px/1 Rubik,sans-serif;color:var(--blue);opacity:.09;animation:drift 22s linear infinite;will-change:transform}
.bg-math span:nth-child(4n+1){color:var(--g)}.bg-math span:nth-child(4n+2){color:var(--o)}.bg-math span:nth-child(4n+3){color:var(--cyan)}
.bg-math span:nth-child(1){left:6%;animation-delay:-2s;font-size:40px}.bg-math span:nth-child(2){left:20%;animation-delay:-9s;animation-duration:26s}
.bg-math span:nth-child(3){left:34%;animation-delay:-15s;font-size:28px}.bg-math span:nth-child(4){left:48%;animation-delay:-5s;animation-duration:30s}
.bg-math span:nth-child(5){left:62%;animation-delay:-12s;font-size:46px}.bg-math span:nth-child(6){left:76%;animation-delay:-19s}
.bg-math span:nth-child(7){left:88%;animation-delay:-7s;font-size:30px;animation-duration:25s}.bg-math span:nth-child(8){left:14%;animation-delay:-17s;animation-duration:28s}
.bg-math span:nth-child(9){left:55%;animation-delay:-1s;font-size:26px}.bg-math span:nth-child(10){left:94%;animation-delay:-13s;animation-duration:32s}
@keyframes drift{from{transform:translate3d(0,0,0) rotate(0)}50%{transform:translate3d(18px,-55vh,0) rotate(160deg)}to{transform:translate3d(-10px,-112vh,0) rotate(360deg)}}
/* header */
.top{background:var(--grad);border-radius:0 0 26px 26px;box-shadow:0 8px 24px #0b3d9140;padding-bottom:14px;overflow:hidden}
.top::after{content:"";position:absolute;inset:auto -20% -60% 30%;height:140%;background:radial-gradient(circle,#22c7f566,transparent 60%);pointer-events:none}
.name{font-weight:800;font-size:20px;letter-spacing:.3px}
.dot{background:var(--g);animation:live 2s ease-in-out infinite}@keyframes live{50%{box-shadow:0 0 0 5px #3cc84a33}}
.icon-btn{transition:transform .15s,background .15s}.icon-btn:active{transform:scale(.88)}
/* Alon avatar (head) */
.alon-av{position:relative;flex:none;width:50px;height:50px;border-radius:50%;background:radial-gradient(circle at 50% 40%,#fff 55%,#DCEBFF);box-shadow:0 0 0 3px #ffffff70,0 4px 14px #0b3d9150;display:block;animation:bob 3.4s ease-in-out infinite}
.alon-av img{width:100%;height:100%;display:block;border-radius:50%}
.lid{position:absolute;background:#052B66;border-radius:50%;transform:scaleY(0);transform-origin:50% 0;animation:blink 4.6s infinite;pointer-events:none}
.alon-av .lid{top:55.9%;width:17.5%;height:17.3%}.alon-av .lid.l{left:23%}.alon-av .lid.r{left:58.5%}
@keyframes blink{0%,91%,100%{transform:scaleY(0)}94.5%{transform:scaleY(1)}}
@keyframes bob{50%{transform:translateY(-3px) rotate(-3deg)}}
.alon-av.mini{width:34px;height:34px;box-shadow:0 2px 8px #0b3d9126;animation:none;align-self:flex-end}
.alon-av.mini .lid{animation-delay:1.3s}
.alon-av.thinking{animation:think 1.1s ease-in-out infinite}
.alon-av.thinking .lid{animation:none;transform:scaleY(.45)}
@keyframes think{0%,100%{transform:rotate(-8deg)}50%{transform:rotate(8deg) translateY(-2px)}}
.alon-av.happy,.alon-hero.happy>img{animation:hop .5s cubic-bezier(.3,1.6,.5,1) 3}
@keyframes hop{0%,100%{transform:translateY(0) scale(1)}35%{transform:translateY(-10px) scale(1.06,.96)}70%{transform:translateY(0) scale(.97,1.04)}}
.alon-av.wave,.alon-hero.wave>img{animation:wave .45s ease-in-out 4;transform-origin:50% 90%}
@keyframes wave{0%,100%{transform:rotate(0)}25%{transform:rotate(-10deg)}75%{transform:rotate(10deg)}}
.speaking .alon-av{animation:talk .45s infinite alternate}@keyframes talk{to{box-shadow:0 0 0 6px #22c7f588,0 4px 14px #0b3d9150}}
/* Alon hero (full robot) */
.alon-hero{position:relative;width:min(210px,58vw);margin:0 auto 2px;aspect-ratio:480/383}
.alon-hero>img{position:relative;width:100%;height:auto;display:block;z-index:1;animation:float 3.8s ease-in-out infinite;-webkit-mask-image:linear-gradient(#000 88%,transparent);mask-image:linear-gradient(#000 88%,transparent)}
.alon-hero .lid{z-index:2;top:42.8%;width:12.6%;height:15.7%;animation:blink 4.6s infinite,float 3.8s ease-in-out infinite}
.alon-hero .lid.l{left:30.1%}.alon-hero .lid.r{left:55.9%}
.alon-hero .lid{animation-name:blinkf,float;animation-duration:4.6s,3.8s}
@keyframes blinkf{0%,91%,100%{scale:1 0}94.5%{scale:1 1}}
.alon-hero .lid{transform:none;scale:1 0}
.alon-hero .ant{position:absolute;z-index:2;left:45.3%;top:2.2%;width:8.7%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle at 35% 35%,#bff4ff,#22c7f5 55%,transparent 72%);mix-blend-mode:screen;animation:ant 1.9s ease-in-out infinite,float 3.8s ease-in-out infinite}
@keyframes ant{0%,100%{opacity:.25;scale:1}50%{opacity:1;scale:1.35}}
.alon-hero .glow{position:absolute;inset:8% 8% 4%;border-radius:50%;background:radial-gradient(circle,#22c7f555,#1e7bff22 50%,transparent 70%);filter:blur(6px);animation:pulseglow 3.8s ease-in-out infinite}
@keyframes pulseglow{50%{transform:scale(1.08);opacity:.75}}
.alon-hero .shadow{position:absolute;left:28%;right:28%;bottom:-6px;height:12px;border-radius:50%;background:#0b3d9126;filter:blur(3px);animation:shad 3.8s ease-in-out infinite}
@keyframes float{50%{translate:0 -9px}}
@keyframes shad{50%{transform:scaleX(.8);opacity:.6}}
.alon-hero.thinking>img{animation:think 1.1s ease-in-out infinite;transform-origin:50% 90%}
.wordmark{font-weight:800;font-size:54px;line-height:.95;color:var(--navy);letter-spacing:1px;text-shadow:0 4px 0 #d8e9ff}
.tagline{color:var(--blue);font-weight:700;font-size:16px;margin-top:-2px}
/* bubbles */
main{padding:16px 12px 10px;gap:12px}
.row{animation:pop .38s cubic-bezier(.3,1.5,.6,1) both}
.row.me{animation-name:popme}
@keyframes pop{from{opacity:0;transform:translateY(10px) scale(.92);transform-origin:100% 100%}}
@keyframes popme{from{opacity:0;transform:translateX(-14px) scale(.92)}}
.bubble{border-radius:22px;font-size:16px}
.bot .bubble{background:#fff;border:2px solid #D8E9FF;border-bottom-right-radius:6px;box-shadow:0 3px 0 #d8e9ff,0 6px 16px #0b3d910f}
.me .bubble{background:linear-gradient(135deg,#1E7BFF,#22A5F5);border-bottom-left-radius:6px;box-shadow:0 3px 0 #0b3d9140}
.bubble.err{background:#FFF1E6;color:#9A3412;border-color:#FFD3A8}
.typing .bubble{align-items:center;gap:6px;padding:10px 14px}
.typing .tlabel{font-size:13px;color:#5B7BB0;margin-inline-end:2px}
.typing i{width:auto;height:auto;background:none;font:800 16px/1 Rubik,sans-serif;font-style:normal;opacity:.35;animation:hopdot 1.1s infinite}
.typing i:nth-of-type(1){color:var(--g)}.typing i:nth-of-type(2){color:var(--blue);animation-delay:.18s}.typing i:nth-of-type(3){color:var(--o);animation-delay:.36s}
@keyframes hopdot{0%,70%,100%{opacity:.35;transform:translateY(0)}35%{opacity:1;transform:translateY(-6px)}}
.welcome{background:#ffffffaa;align-self:center;border-radius:999px;padding:3px 12px;color:#5B7BB0}
/* chips & composer */
.chips button{border:2px solid #CFE3FF;color:var(--navy);font-weight:700;box-shadow:0 3px 0 #cfe3ff;transition:transform .12s,box-shadow .12s}
.chips button:nth-child(2){border-color:#BDEBC2;box-shadow:0 3px 0 #bdebc2}.chips button:nth-child(3){border-color:#FFDDA6;box-shadow:0 3px 0 #ffdda6}
.chips button:active{transform:translateY(3px);box-shadow:none}
.composer{background:#ffffffe6;backdrop-filter:blur(8px);border-top:0;border-radius:22px 22px 0 0;box-shadow:0 -6px 20px #0b3d910d}
textarea{border:2px solid #D8E9FF;border-radius:24px}
textarea:focus{border-color:var(--blue);box-shadow:0 0 0 4px #1e7bff1f}
.composer .cam{background:#E9F9EB;color:var(--g)}
.send{background:linear-gradient(135deg,#3CC84A,#22A93A);box-shadow:0 4px 0 #1f8a2f,0 6px 14px #3cc84a55;transition:transform .12s,box-shadow .12s}
.send:active,.mic:active,.card .primary:active,.btn:active{transform:translateY(3px)}
.send:active{box-shadow:0 1px 0 #1f8a2f}
.mic{background:#FFF1DC;color:#E07B00;transition:transform .12s}
.recording .mic{background:var(--o);box-shadow:0 0 0 8px #ffa50033}
.rechint{border-color:var(--o);color:#C46A00}
@keyframes pulse{50%{box-shadow:0 0 0 14px #ffa50011}}
/* tabs */
.tabs{background:#fff;border-top:0;box-shadow:0 -4px 18px #0b3d9112}
.tabs button{transition:color .2s}.tabs button span{transition:transform .25s cubic-bezier(.3,1.6,.5,1)}
.tabs button.on{color:var(--navy)}.tabs button.on span{transform:translateY(-3px) scale(1.15)}
/* gates & cards */
.gate{background:radial-gradient(120% 80% at 50% 0,#22C7F5 0,#1E7BFF 40%,#0B3D91 100%)}
.gate .card{border-radius:30px;box-shadow:0 18px 40px #04163f55;padding-top:18px;position:relative}
.gate-h{font-size:19px;margin-top:8px!important}
.card .primary{background:linear-gradient(135deg,#3CC84A,#25B03A);box-shadow:0 4px 0 #1f8a2f;border-radius:16px;font-size:17px;transition:transform .12s,box-shadow .12s}
.card .primary:active{box-shadow:0 1px 0 #1f8a2f}
.card input{border:2px solid #D8E9FF;border-radius:16px}
/* access code: full width, monospace, the whole code visible (up to 40 chars shrink to fit) */
#codeInput{width:100%;max-width:100%;box-sizing:border-box;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,'Liberation Mono','DejaVu Sans Mono',monospace;font-size:clamp(15px,4.8vw,19px);letter-spacing:.04em;padding:13px 10px;text-transform:uppercase;direction:ltr;text-align:center}
#codeInput::placeholder{font-family:'Varela Round',Rubik,system-ui,sans-serif;letter-spacing:0;text-transform:none}.card input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px #1e7bff1f}
.buy{display:block;color:#fff;background:linear-gradient(135deg,#FFB020,#FF8A00);padding:12px;border-radius:16px;font-weight:700;text-decoration:none;box-shadow:0 4px 0 #d06d00;font-size:15.5px}
.buy:active{transform:translateY(3px);box-shadow:0 1px 0 #d06d00}
.card .opt{border:2px solid #D8E9FF;background:#F5FAFF;border-radius:16px;transition:transform .12s,border-color .15s}
.card .opt:active{transform:scale(.96)}
.card .opt.sel{border-color:var(--blue);background:#E6F1FF;color:var(--navy);box-shadow:0 3px 0 #bfdcff}
.steps i.on{background:var(--g)}
.panel{border-radius:22px;border:2px solid #E1EEFF}
.next{background:var(--grad);border:0}
.btn{background:linear-gradient(135deg,#3CC84A,#25B03A);box-shadow:0 3px 0 #1f8a2f}
.toast{background:var(--navy);box-shadow:0 8px 20px #0b3d9150;animation:pop .35s cubic-bezier(.3,1.5,.6,1)}
.trial-note{background:linear-gradient(90deg,#FFF3D6,#FFE7B8);color:#7A4A00;font-weight:700}
/* confetti */
.confetti{position:fixed;inset:0;pointer-events:none;z-index:60;overflow:hidden}
.confetti i{position:absolute;top:-20px;left:var(--x);width:9px;height:14px;border-radius:3px;background:var(--c);animation:fall var(--d) cubic-bezier(.25,.6,.45,1) var(--dl) forwards}
.confetti i.sym{width:auto;height:auto;background:none;color:var(--c);font:800 22px/1 Rubik,sans-serif;font-style:normal}
@keyframes fall{to{transform:translate3d(var(--dx),110vh,0) rotate(var(--r))}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.bg-math{display:none}.lid{display:none}}
html,body{overflow-x:hidden}.bg-math{contain:strict}
.inwrap{min-width:0}.inwrap textarea{min-width:0;width:100%}
.typing>.bubble{flex-direction:row;white-space:nowrap}

/* terms/privacy consent + SMS OTP */
.consent-card{text-align:right!important}
.consent-chk{display:flex;gap:10px;align-items:flex-start;background:var(--bg);border:1.5px solid #CFE3FF;border-radius:14px;padding:12px;font-size:14.5px;line-height:1.55;cursor:pointer}
.consent-chk input{width:22px;height:22px;flex:none;accent-color:var(--g);margin-top:2px}
.consent-chk a{color:var(--p);font-weight:700}
.card .primary:disabled{opacity:.45;cursor:not-allowed}
#otpGateIn{font-size:22px;letter-spacing:4px}
#consent,#otpGate{z-index:12}
.card .danger{background:#FFECEC;color:#B91C1C}

/* exercises: each on its own line, LTR, centered (public/chatfmt.js) */
.ex{display:block;direction:ltr;unicode-bidi:isolate;text-align:center;margin:8px 0;padding:8px 12px;border-radius:14px;background:#F0F7FF;border:1.5px solid #CFE3FF;color:var(--navy);font-size:19px;line-height:1.5;white-space:normal;overflow-x:auto;overflow-y:hidden}
.ex-plain{font-family:Rubik,"Varela Round",system-ui,sans-serif;font-weight:700;letter-spacing:.5px;word-spacing:2px}
.ex .katex-display{margin:0}.ex .katex{font-size:1.08em}
.exi{direction:ltr;unicode-bidi:isolate;white-space:nowrap;font-weight:700}
.qtext .ex{font-size:20px}
.stq{line-height:1.5}.stq .ex{font-size:26px;margin:8px auto 0;max-width:260px;background:#fff;border:2.5px solid var(--ink)}
.mc button{direction:ltr;unicode-bidi:isolate}
/* graphs (```graph blocks) */
.graph{display:block;margin:8px 0;width:72vw;max-width:320px;direction:ltr;background:#fff;border:1.5px solid #CFE3FF;border-radius:14px;padding:6px 6px 8px;white-space:normal}
.graph figcaption{font-family:Rubik,sans-serif;font-weight:700;font-size:14px;color:var(--navy);text-align:center;margin:0 0 4px;unicode-bidi:plaintext}
.graph svg{display:block;width:100%;height:auto;font-family:Rubik,"Varela Round",system-ui,sans-serif}
.graph .bg{fill:#FAFCFF}.graph .grid{stroke:#E1EEFF;stroke-width:1}.graph .axis{stroke:#0B2A66;stroke-width:1.6}.graph .arrow{fill:#0B2A66}
.graph .t{font-size:10px;fill:#5B7BB0}.graph .an{font-size:12px;font-weight:700;fill:#0B2A66;font-style:italic}
.graph .pt{fill:#0B2A66;stroke:#fff;stroke-width:1.5}.graph .pl{font-size:11px;font-weight:700;fill:#0B2A66;paint-order:stroke;stroke:#fff;stroke-width:3px;stroke-linejoin:round}
.graph .legend{display:flex;flex-wrap:wrap;gap:4px 12px;justify-content:center;font-size:13px;color:var(--ink);margin-top:4px}
.graph .legend span{display:inline-flex;align-items:center;gap:5px;direction:ltr;unicode-bidi:isolate}.graph .legend i{display:inline-block;width:16px;height:3px;border-radius:2px}
.graph-err{font-size:13px;color:#6B7280;text-align:center;width:auto}
.bubble:has(.graph){width:100%}
/* math-symbols keyboard */
.symbtn{flex:none;width:38px;height:44px;border-radius:14px;border:2px solid #CFE3FF;background:#F0F7FF;color:var(--navy);font:800 15px/1 Rubik,"Varela Round",sans-serif;cursor:pointer;padding:0;direction:ltr;transition:transform .12s}
.symbtn.on{background:var(--navy);border-color:var(--navy);color:#fff}.symbtn:active{transform:scale(.92)}
.sympanel{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:5px;padding:7px 8px;margin:0 8px 6px;background:#fff;border:2px solid #D8E9FF;border-radius:18px;box-shadow:0 -4px 16px #0b3d910f;direction:ltr;max-height:34dvh;overflow-y:auto}
.sympanel button{height:36px;border:1.5px solid #D8E9FF;border-radius:11px;background:#F5FAFF;color:var(--navy);font:700 17px/1 Rubik,"Varela Round",system-ui,sans-serif;cursor:pointer;padding:0;touch-action:manipulation;user-select:none;-webkit-user-select:none}
.sympanel button.w{font-size:14px}.sympanel button:active{background:#D8E9FF;transform:translateY(1px)}
/* efficio icon set (public/icons.js): 2px round stroke in currentColor + one accent (--ia) */
:root{--ia:var(--cyan)}
.ico{width:1.15em;height:1.15em;vertical-align:-.2em;display:inline-block;flex:none;margin-inline-end:.3em;overflow:visible}
.ic{display:inline-flex;font-style:normal;margin-inline-end:.45em}.ic .ico{margin:0}.tabs .ic,.icon-btn .ic{margin:0}
.top{--ia:#FFD23F}.icon-btn .ico{width:22px;height:22px;margin:0}
.tabs button span .ico{width:24px;height:24px;margin:0}
.toast{--ia:#FFD23F;display:flex;align-items:center;gap:2px}
.menu button .ico,.opts button .ico{color:var(--p)}
.panel h3 .ico{color:var(--p);width:1.25em;height:1.25em}
.ico.big{width:64px;height:64px;margin:0 auto 4px;display:block;color:var(--p)}
.modes button .ico{width:20px;height:20px;vertical-align:-.3em}
.lesson .big .ico{width:56px;height:56px;margin:0;color:var(--p)}.lesson .big .ten{font-family:Rubik;font-size:40px;color:var(--p)}
.objs{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:2px;line-height:1}.objs.grid{display:block;text-align:center}
.ico.obj{width:30px;height:30px;margin:1px;vertical-align:middle}.objs .op{font-family:Rubik;font-size:26px;color:var(--p);margin:0 6px}
h2 .ico.obj{width:34px;height:34px}
.choc button .ico.obj{width:32px;height:32px;margin:0}
.guide .hear .ico{width:18px;height:18px;margin:0}
.fb .ico{width:22px;height:22px}.ico.ok{color:#15803D}.ico.bad{color:#B91C1C}
.path button .ico{width:12px;height:12px;margin-inline-end:2px}
.lvl .ico{width:12px;height:12px}
.bubble .ico.obj{width:24px;height:24px;vertical-align:-.35em}
.fixline{display:inline-flex;align-items:center;justify-content:center;width:1.5em;height:1.5em;border-radius:50%;background:var(--bg);color:var(--p);margin-inline-end:.35em;vertical-align:-.35em}
.fixline .ico{width:1em;height:1em;margin:0}