@font-face{font-family:'Figtree';src:url('/assets/fonts/figtree-400.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Figtree';src:url('/assets/fonts/figtree-600.woff2') format('woff2');font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:'Figtree';src:url('/assets/fonts/figtree-700.woff2') format('woff2');font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:'Bricolage Grotesque';src:url('/assets/fonts/bricolage-grotesque-600.woff2') format('woff2');font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:'Bricolage Grotesque';src:url('/assets/fonts/bricolage-grotesque-700.woff2') format('woff2');font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:'Bricolage Grotesque';src:url('/assets/fonts/bricolage-grotesque-800.woff2') format('woff2');font-weight:800;font-style:normal;font-display:swap}
@font-face{font-family:'JetBrains Mono';src:url('/assets/fonts/jetbrains-mono-500.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:'JetBrains Mono';src:url('/assets/fonts/jetbrains-mono-700.woff2') format('woff2');font-weight:700;font-style:normal;font-display:swap}
:root{--ink:#000;--paper:#fff;--grey:#6b6b6b;--rule:#e6e6e6;--soft:#f5f5f5;--dots:#dcdcdc;
--sun:url(#p-dots);--coral:url(#p-lines);--mint:url(#p-fine);--sky:url(#p-dots);--lilac:url(#p-cross);
--font:"Atkinson Hyperlegible",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
--maxw:1180px;color-scheme:light;box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
html{scroll-padding-top:calc(env(safe-area-inset-top,0px) + 80px);-webkit-text-size-adjust:100%;text-size-adjust:100%}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;background:#fff;color:#000;font:400 17px/1.6 var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.08;letter-spacing:-.02em}
p{margin:0}ol,ul{margin:0;padding:0}a{color:inherit}
button{font:inherit;color:inherit;-webkit-tap-highlight-color:transparent}
svg{display:block;max-width:100%;overflow:visible}
[hidden]{display:none!important}
:focus-visible{outline:2.5px solid #000;outline-offset:3px;border-radius:10px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
@media(min-width:760px){.wrap{padding:0 40px}}
.i{fill:none;stroke:#000;stroke-width:var(--sw,2.5);stroke-linecap:round;stroke-linejoin:round}
.s{stroke:#000;stroke-width:var(--sw,2.5);stroke-linecap:round;stroke-linejoin:round}
.w{fill:#fff;stroke:#000;stroke-width:var(--sw,2.5);stroke-linecap:round;stroke-linejoin:round}
.k{fill:#000}.fw{fill:#fff}
.t2{stroke-width:calc(var(--sw,2.5)*.8)}.t3{stroke-width:calc(var(--sw,2.5)*1.2)}
.tube{fill:none;stroke:#000;stroke-linecap:round;stroke-linejoin:round}
.tube-in{fill:none;stroke:#fff;stroke-linecap:round;stroke-linejoin:round}
.dash{stroke-dasharray:2 8}
.f-sun{fill:var(--sun)}.f-coral{fill:var(--coral)}.f-mint{fill:var(--mint)}.f-sky{fill:var(--sky)}.f-lilac{fill:var(--lilac)}.f-sun2,.f-sky2{fill:#fff}
.hand{font-family:var(--font);font-weight:700;fill:#000}.hand.muted{fill:var(--grey);font-weight:400}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes spinr{to{transform:rotate(-360deg)}}
@keyframes pop{0%{transform:scale(.5);opacity:0}70%{transform:scale(1.08);opacity:1}100%{transform:scale(1);opacity:1}}
@keyframes rise{from{transform:translateY(8px);opacity:0}to{transform:none;opacity:1}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
@keyframes flow{to{stroke-dashoffset:-24}}
@keyframes hop{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
@keyframes caret{50%{opacity:0}}

.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid transparent;transition:border-color .2s}
.top.scrolled{border-color:var(--rule)}
.bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:inline-flex;align-items:center;gap:9px;font-weight:700;font-size:19px;letter-spacing:-.02em;text-decoration:none}
.logo svg{width:34px;height:31px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:999px;font-weight:700;font-size:16px;line-height:1;text-decoration:none;border:1.5px solid #000;cursor:pointer;transition:background .15s,color .15s,transform .1s;white-space:nowrap}
.btn-ink{background:#000;color:#fff}.btn-ink:hover{background:#2b2b2b}
.btn-line{background:#fff;color:#000}.btn-line:hover{background:#f2f2f2}
.btn:active{transform:scale(.98)}.btn:disabled{opacity:.35;cursor:not-allowed;transform:none}
.btn-sm{min-height:42px;padding:0 18px;font-size:15px}
.link-btn{background:none;border:0;min-height:44px;padding:0 4px;font-weight:700;font-size:15px;color:#000;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:5px;cursor:pointer}
.link-btn:disabled{opacity:.3;cursor:not-allowed}

.intro{padding:40px 0 4px;max-width:40rem}
.intro svg{width:60px;height:auto;margin-bottom:18px}
.intro h1{font-size:clamp(36px,5.6vw,62px);line-height:1.02;letter-spacing:-.035em}
.intro p{margin-top:16px;font-size:clamp(17px,1.6vw,19px);color:var(--grey);max-width:32em}
.intro .btn{margin-top:24px}
@media(min-width:960px){.intro{padding:72px 0 12px}}
.lvl{margin-top:52px}
.lvl-head{display:grid;grid-template-columns:36px 1fr;gap:14px;align-items:start;padding-bottom:14px;border-bottom:1px solid var(--rule)}
.lvl-n{width:36px;height:36px;border-radius:50%;border:1.5px solid #000;display:grid;place-items:center;font-weight:700;font-size:15px}
.lvl-head h2{font-size:22px;line-height:1.2;margin-top:3px}
.lvl-head p{font-size:15px;color:var(--grey);margin-top:2px}
.grid{display:grid;grid-template-columns:1fr;gap:12px;margin-top:16px}
.card{display:grid;grid-template-columns:54px 1fr;gap:14px;align-items:center;min-height:86px;padding:14px 16px;border:1.5px solid var(--rule);border-radius:16px;background:#fff;text-decoration:none;transition:border-color .15s}
.card:hover{border-color:#000}
.card svg{width:54px;height:54px}
.card .num{display:block;font-size:12.5px;color:var(--grey)}
.card b{display:block;font-size:17px;line-height:1.25;margin-top:1px}
.card .d{display:block;font-size:14.5px;line-height:1.35;color:var(--grey);margin-top:3px}
@media(min-width:640px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.grid{grid-template-columns:repeat(5,1fr)}.card{grid-template-columns:1fr;align-items:start;gap:18px;padding:18px;min-height:200px}.card svg{width:58px;height:58px}}

.crumbs{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0}
.back{display:inline-flex;align-items:center;gap:6px;min-height:44px;font-weight:700;font-size:15px;text-decoration:none}
.back svg{width:18px;height:18px}
.back:hover{text-decoration:underline;text-underline-offset:4px}
.count{font-size:14px;color:var(--grey)}
.l-head{padding:8px 0 24px;border-bottom:1px solid var(--rule)}
.l-level{font-size:14.5px;color:var(--grey)}
.l-head h1{font-size:clamp(32px,4.6vw,52px);letter-spacing:-.03em;margin-top:6px;outline:none}
.l-line{margin-top:8px;font-size:clamp(17px,1.6vw,19px);color:var(--grey)}
.lesson{animation:rise .3s ease}
.lesson-grid{display:grid;gap:24px;margin-top:28px}
.lesson-grid>*{min-width:0}
@media(min-width:900px){.lesson-grid{grid-template-columns:1.1fr 1fr;gap:40px;align-items:start}.lesson-grid>.scene{position:sticky;top:88px}}
.scene{margin:0;position:relative;border-radius:20px;border:1.5px solid var(--rule);overflow:hidden;background-color:#fff;background-image:radial-gradient(circle,var(--dots) 1.1px,transparent 1.4px);background-size:16px 16px;background-position:8px 8px}
.scene>svg{width:100%;height:auto}
.idea{font-size:clamp(18px,1.7vw,20px);line-height:1.55}
.activity{margin-top:22px;padding:18px;border-radius:18px;background:var(--soft)}
.activity h4{font-size:17px;margin-bottom:12px;letter-spacing:-.01em}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.row+.row{margin-top:12px}
.say{min-height:48px;margin-top:12px;font-weight:700;font-size:16px;line-height:1.45}
.deeper{margin-top:20px;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.deeper summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:54px;font-weight:700;font-size:16px}
.deeper summary::-webkit-details-marker{display:none}
.deeper summary::after{content:"+";font-size:24px;font-weight:400;line-height:1}
.deeper[open] summary::after{content:"\2212"}
.deeper p{padding:0 0 18px;font-size:16px;line-height:1.65;color:#222}
.l-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:44px;padding-top:24px;border-top:1px solid var(--rule)}
.l-step{display:block;padding:14px 16px;border:1.5px solid var(--rule);border-radius:16px;text-decoration:none;min-width:0}
.l-step:hover{border-color:#000}
.l-step small{display:block;font-size:13px;color:var(--grey)}
.l-step b{display:block;font-size:16px;line-height:1.3;margin-top:2px}
.l-step.next{text-align:right;grid-column:2}
.l-step.off{visibility:hidden}

.pick{display:inline-flex;align-items:center;gap:10px;min-height:52px;padding:6px 16px 6px 8px;border-radius:14px;border:1.5px solid #000;background:#fff;font-weight:700;font-size:15.5px;line-height:1.25;cursor:pointer;color:#000;text-align:left;transition:transform .12s,background .2s,color .2s}
.pick:active{transform:scale(.97)}
.pick svg{width:38px;height:38px;flex:0 0 auto}
.pick.plain{padding:6px 18px}
.pick.yes{background:#000;color:#fff}.pick.yes svg{filter:invert(1)}
.pick.no{color:#9a9a9a;border-color:#d4d4d4;text-decoration:line-through}.pick.no svg{opacity:.4}
.pick:disabled{opacity:.45;cursor:default}
.picks{display:grid;grid-template-columns:1fr 1fr;gap:10px}.picks .pick{min-width:0}
.tog{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:4px 16px;border-radius:999px;border:1.5px solid #000;background:#fff;font-weight:700;font-size:15px;cursor:pointer;color:#000}
.tog svg{width:28px;height:28px}
.tog[aria-pressed="true"]{background:#000;color:#fff}.tog[aria-pressed="true"] svg{filter:invert(1)}
.label{font-size:14px;font-weight:700;color:var(--grey);margin-right:2px}
.chipset{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.chipset+.chipset{margin-top:10px}
.confetti{opacity:0;transform-box:fill-box;transform-origin:center;transform:scale(.3);transition:opacity .3s,transform .4s cubic-bezier(.3,1.6,.5,1)}
.party .confetti{opacity:1;transform:scale(1)}
.party .pip-hop{animation:hop .55s ease 3}
.pattern-scene{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;min-height:250px;padding:28px 10px}
.pattern{display:flex;gap:clamp(5px,1.4vw,10px);justify-content:center}
.tile{width:clamp(42px,10.5vw,68px);aspect-ratio:1;border-radius:14px;background:#fff;border:1.5px solid #000;display:grid;place-items:center}
.tile svg{width:76%;height:76%}
.tile.q{border-style:dashed;font-weight:700;font-size:clamp(22px,4vw,28px)}
.tile.got{animation:pop .45s ease}
.pattern-pip{width:80px;height:auto}
.yay .pattern-pip{animation:hop .55s ease 2}
.opts{display:flex;gap:12px;flex-wrap:wrap}
.opt{width:72px;height:72px;border-radius:18px;border:1.5px solid #000;background:#fff;display:grid;place-items:center;cursor:pointer;transition:transform .12s}
.opt svg{width:72%;height:72%}.opt:active{transform:scale(.95)}
.opt.right{background:#000}.opt.right svg{filter:invert(1)}
.shake{animation:shake .35s ease}
.mem-pop{transform-box:fill-box;transform-origin:center;animation:pop .4s ease}
#lesson-model .st{transition:opacity .35s}
#lesson-model .st.dim{opacity:.18}
#lesson-model .st.on .gear1{transform-box:fill-box;transform-origin:center;animation:spin 3s linear infinite}
#lesson-model .st.on .gear2{transform-box:fill-box;transform-origin:center;animation:spinr 2.2s linear infinite}
#lesson-model .st.on .numfloat{animation:bob 2.4s ease-in-out infinite}
#lesson-model .st.on .answer{transform-box:fill-box;transform-origin:center;animation:pop .5s ease}
.steps-dots{display:flex;gap:8px;margin:2px 0 10px}
.steps-dots i{width:26px;height:6px;border-radius:9px;background:#fff;border:1.5px solid #000}
.steps-dots i.on{background:#000}
.cap{font-size:17px;min-height:84px}
.edge{stroke:#d6d6d6;stroke-width:2;stroke-linecap:round;transition:stroke .3s}
.edge.lit{stroke:#000;stroke-width:3;stroke-dasharray:7 5;animation:flow .7s linear infinite}
.node{fill:#fff;stroke:#000;stroke-width:2.5;transition:fill .3s}
.node.on{fill:#000}
.nn-label{transition:opacity .3s;opacity:.3}.nn-label.on{opacity:1}
#nn-card{transition:transform .3s}#nn-card.on{transform:translateX(4px)}
.llm-scene{padding:18px;min-height:250px;display:flex;flex-direction:column;gap:14px}
.chat{background:#fff;border:1.5px solid #000;border-radius:18px;padding:16px 18px}
.chat-head{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--grey);border-bottom:1px solid var(--rule);padding-bottom:10px;margin-bottom:12px}
.chat-head svg{width:32px;height:29px}
.chat-head b{color:#000;font-size:15px}
.story{font-weight:700;font-size:clamp(19px,2vw,22px);line-height:1.6;min-height:3.2em}
.story mark{background:none;color:inherit;text-decoration:underline;text-decoration-thickness:3px;text-underline-offset:5px}
.blank{display:inline-block;width:3.4em;height:1.15em;border-bottom:2.5px solid #000;position:relative;vertical-align:-0.2em}
.blank::after{content:"";position:absolute;left:5px;bottom:4px;width:2px;height:1em;background:#000;animation:caret 1s steps(1) infinite}
.tokens{display:flex;flex-wrap:wrap;gap:6px}
.tok{display:inline-block;padding:3px 9px;border-radius:8px;border:1.5px solid #000;font-size:14.5px;font-weight:700;background:#fff;animation:pop .3s ease both}
.tok:nth-child(even){background:#000;color:#fff}
.nexts{display:grid;gap:8px}
.next{display:grid;grid-template-columns:minmax(84px,auto) 1fr 44px;align-items:center;gap:12px;min-height:50px;padding:6px 14px;border-radius:14px;border:1.5px solid #000;background:#fff;cursor:pointer;color:#000;text-align:left}
.next b{font-size:17px}
.next .bar{height:10px;border-radius:9px;background:#fff;overflow:hidden;border:1.5px solid #000}
.next .bar i{display:block;height:100%;background:#000}
.next .pct{font-weight:700;font-size:15px;text-align:right}
.next.chosen{background:#000;color:#fff}.next.chosen .bar{border-color:#fff;background:#000}.next.chosen .bar i{background:#fff}
.dial{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;align-items:center;margin-top:14px}
.dial label{font-weight:700;font-size:15px}
.dial input{width:100%;accent-color:#000;height:28px}
.dial .ends{grid-column:2;display:flex;justify-content:space-between;font-size:13.5px;color:var(--grey)}
#gen-svg .nz{fill:#000}
#lesson-tools:not([hidden]) .tool{transform-box:fill-box;transform-origin:center;animation:pop .45s ease both}
#lesson-tools .tool:nth-of-type(2){animation-delay:.08s}#lesson-tools .tool:nth-of-type(3){animation-delay:.16s}#lesson-tools .tool:nth-of-type(4){animation-delay:.24s}#lesson-tools .tool:nth-of-type(5){animation-delay:.32s}#lesson-tools .tool:nth-of-type(6){animation-delay:.4s}
.blocks{display:flex;flex-wrap:wrap;gap:8px}
.block{min-height:44px;padding:6px 14px;border-radius:12px;border:1.5px dashed #000;background:#fff;font-weight:700;font-size:15px;color:#000;cursor:pointer}
.block[aria-pressed="true"]{border-style:solid;background:#000;color:#fff}
.prompt-out{margin-top:12px;min-height:76px;padding:12px 14px;border-radius:14px;border:1.5px solid #000;background:#fff;font-size:16px;line-height:1.5}
.prompt-out.empty{color:var(--grey)}
.meter{display:flex;gap:6px;margin-top:12px}
.meter i{flex:1;height:8px;border-radius:9px;border:1.5px solid #000;background:#fff;transition:background .25s}
.meter i.on{background:#000}
#lesson-safe:not([hidden]) .floaty{animation:bob 4.5s ease-in-out infinite}
#lesson-safe .floaty.b{animation-delay:-1.5s}#lesson-safe .floaty.c{animation-delay:-3s}
.qcard{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 18px;border-radius:14px;border:1.5px solid #000;background:#fff;transition:background .25s,color .25s}
.qcard b{font-size:18px;line-height:1.3}
.qcard small{color:var(--grey);font-weight:700;white-space:nowrap}
.qcard.good{background:#000;color:#fff}.qcard.good small{color:#fff}
.qcard.bad{border-style:dashed}
.points{list-style:none;display:grid;gap:16px}
.points li{display:grid;grid-template-columns:32px 1fr;gap:14px;align-items:start}
.pn{width:32px;height:32px;border-radius:50%;border:1.5px solid #000;display:grid;place-items:center;font-weight:700;font-size:14px}
.points p{font-size:clamp(17px,1.6vw,19px);line-height:1.5;padding-top:2px}
.q{font-weight:700;font-size:17px;margin-bottom:12px}
.ans{display:block;width:100%;text-align:left;min-height:50px;padding:10px 16px;border-radius:14px;border:1.5px solid #000;background:#fff;font-weight:700;font-size:16px;cursor:pointer;color:#000;line-height:1.35}
.ans+.ans{margin-top:8px}
.ans.right{background:#000;color:#fff}
.ans.wrong{color:#9a9a9a;border-color:#d4d4d4;text-decoration:line-through}
.ans:disabled{cursor:default}
#lesson-generic:not([hidden]) .gfloat{animation:bob 4.5s ease-in-out infinite}

.foot{margin-top:88px;padding:20px 0 24px;border-top:1px solid var(--rule);text-align:center}
.powered{font-size:10px;font-weight:700;letter-spacing:.16em;text-decoration:none;color:#000}
.powered:hover{text-decoration:underline;text-underline-offset:3px}
.scene>svg.pattern-pip{width:80px;height:auto}
.l-nav{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.next{grid-template-columns:minmax(72px,auto) minmax(0,1fr) 44px}
.dial{grid-template-columns:auto minmax(0,1fr)}
.picks{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid>*{min-width:0}
main{overflow-x:clip}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
.app{width:100%;max-width:720px;margin:0 auto;padding:0 16px}
@media(min-width:760px){.app{padding:0 24px}}
.bar{height:60px}
.logo{font-size:20px;letter-spacing:.02em}
.pill{display:inline-flex;align-items:center;gap:8px;height:34px;padding:0 12px 0 8px;border:1.5px solid var(--rule);border-radius:999px;font-weight:700;font-size:14px}
.pill svg{width:20px;height:20px}
.hi{padding:22px 0 0}
.hi h1{font-size:clamp(34px,7vw,48px);line-height:1.02;letter-spacing:-.035em}
.hi p{margin-top:8px;color:var(--grey);font-size:17px}
.cont{display:grid;grid-template-columns:112px minmax(0,1fr);align-items:center;gap:12px;margin-top:18px;padding:8px 16px 8px 4px;border:1.5px solid #000;border-radius:24px;text-decoration:none;background:#fff;transition:background .15s}
.cont:hover{background:#fafafa}
.cont svg{width:112px;height:auto}
.cont small{display:block;font-size:13px;color:var(--grey)}
.cont b{display:block;font-size:17px;line-height:1.25;margin-top:2px}
.pbar{display:block;height:8px;border-radius:9px;border:1.5px solid #000;margin-top:10px;overflow:hidden;background:#fff}
.pbar i{display:block;height:100%;background:#000}
.pc{display:block;font-size:13px;color:var(--grey);margin-top:6px}
.chips{display:flex;gap:8px;overflow-x:auto;margin:20px -16px 0;padding:2px 16px 6px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
@media(min-width:760px){.chips{margin:20px -24px 0;padding:2px 24px 6px}}
.chip-b{flex:0 0 auto;min-height:40px;padding:0 14px;border-radius:999px;border:1.5px solid var(--rule);background:#fff;font-weight:700;font-size:14px;cursor:pointer;white-space:nowrap}
.chip-b:hover{border-color:#000}
.chip-b span{color:var(--grey);margin-right:6px}
.course{margin-top:30px;scroll-margin-top:76px}
.c-head{display:grid;grid-template-columns:40px minmax(0,1fr);gap:12px;align-items:start}
.c-n{width:40px;height:40px;border-radius:12px;background:#000;color:#fff;display:grid;place-items:center;font-weight:700;font-size:17px}
.c-head h2{font-size:21px;line-height:1.2;margin-top:1px}
.c-head p{font-size:14.5px;color:var(--grey);margin-top:2px}
.c-meta{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;margin-top:8px;font-size:13px;color:var(--grey)}
.depth{display:inline-flex;align-items:center;gap:4px}
.depth i{width:8px;height:8px;border-radius:50%;border:1.5px solid #000}
.depth i:first-of-type{margin-left:4px}
.depth i.on{background:#000}
.lgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:14px}
.tl{position:relative;display:flex;flex-direction:column;border:1.5px solid var(--rule);border-radius:22px;overflow:hidden;background:#fff;text-decoration:none;transition:border-color .15s}
.tl:hover{border-color:#000}
.tl-art{display:block;padding:6px 6px 0;border-bottom:1.5px solid var(--rule)}
.tl-art svg{width:100%;height:auto}
.tl-txt{display:block;padding:10px 12px 14px}
.tl .num{display:block;font-size:12px;color:var(--grey)}
.tl b{display:block;font-size:15.5px;line-height:1.25;margin-top:2px}
.tl .d{display:block;font-size:13px;line-height:1.3;color:var(--grey);margin-top:3px}
@media(min-width:600px){.tl b{font-size:17px}.tl .d{font-size:14px}.tl-txt{padding:12px 16px 16px}}
.tick{position:absolute;top:10px;right:10px;width:26px;height:26px;border-radius:50%;background:#000;display:grid;place-items:center}
.tick svg{width:14px;height:14px}
.l-hero{margin-top:2px;border:1.5px solid var(--rule);border-radius:24px;overflow:hidden}
.l-art{display:flex;justify-content:center;padding:10px 10px 0;border-bottom:1.5px solid var(--rule);background-color:#fff;background-image:radial-gradient(circle,var(--dots) 1.1px,transparent 1.4px);background-size:16px 16px}
.l-art svg{width:100%;max-width:400px;height:auto}
.l-txt{padding:16px 18px 20px}
.l-course{font-size:14px;color:var(--grey)}
.l-txt h1{font-size:clamp(28px,6vw,40px);letter-spacing:-.03em;margin-top:4px;outline:none}
.l-line{margin-top:6px;font-size:17px;color:var(--grey)}
.badge-done{display:inline-flex;align-items:center;gap:6px;margin-top:12px;padding:4px 12px 4px 8px;border-radius:999px;background:#000;color:#fff;font-size:13px;font-weight:700}
.badge-done svg{width:16px;height:16px}
.eli5{margin-top:16px;padding:18px;border:1.5px solid #000;border-radius:22px;display:grid;grid-template-columns:44px minmax(0,1fr);gap:14px;align-items:start}
.five{width:44px;height:44px;border-radius:50%;background:#000;color:#fff;display:grid;place-items:center;font-weight:700;font-size:20px}
.eli5 h2{font-size:17px;line-height:1.3}
.eli5 p{margin-top:4px;font-size:18px;line-height:1.55}
.sec{font-size:21px;margin:34px 0 14px;letter-spacing:-.02em}
.lesson-grid{margin-top:0}
@media(min-width:900px){.lesson-grid{grid-template-columns:1fr;gap:24px}.lesson-grid>.scene{position:static}}
.done-card{margin-top:16px;padding:18px 18px 20px;border-radius:22px;background:#000;color:#fff}
.done-head{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px}
.done-head svg{width:26px;height:26px}
.remember{margin-top:10px;font-size:17px;line-height:1.5}
.remember span:first-child{font-weight:700}
.done-card .btn{margin-top:16px;background:#fff;color:#000;border-color:#fff;white-space:normal;text-align:center;line-height:1.25;padding:12px 20px;height:auto}
.done-card .btn:hover{background:#ececec}
.app{max-width:960px}
.lgrid{grid-template-columns:repeat(3,minmax(0,1fr));gap:22px 12px;margin-top:16px}
@media(min-width:760px){.lgrid{gap:30px 24px}}
.tl{border:0;border-radius:18px;overflow:visible;background:transparent}
.tl:hover{border-color:transparent}
.tl-art{position:relative;padding:0;border-bottom:0;border-radius:18px;transition:transform .2s ease}
.tl:hover .tl-art{transform:translateY(-3px)}
.tl:focus-visible{outline:2.5px solid #000;outline-offset:4px}
.tl-art svg,.cont svg,.l-art svg{overflow:hidden}
.tl-txt{padding:8px 2px 0}
.tl .num{font-size:11.5px}
.tl b{font-size:14px;line-height:1.25}
.tl .d{display:none}
@media(min-width:700px){.tl b{font-size:16.5px}.tl .d{display:block;font-size:14px}.tl .num{font-size:12.5px}.tl-txt{padding:10px 4px 0}}
.tick{top:2px;right:2px;width:24px;height:24px}
.cont{border:0;background:var(--soft);padding:8px 18px 8px 6px;grid-template-columns:132px minmax(0,1fr)}
.cont:hover{background:#efefef}
.cont svg{width:132px}
body.in-lesson .top{display:none}
.lpage{min-height:100vh}
.lbar{position:sticky;top:env(safe-area-inset-top,0px);z-index:30;display:grid;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:14px;height:60px;padding:0 16px;background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--rule)}
.x{width:44px;height:44px;border-radius:50%;display:grid;place-items:center}
.x:hover{background:#f2f2f2}
.x svg{width:20px;height:20px}
.lprog{height:8px;border-radius:9px;background:#ececec;overflow:hidden}
.lprog i{display:block;width:0;height:100%;background:#000;border-radius:9px}
.lside{background-color:#f6f6f6;background-image:radial-gradient(circle,#e1e1e1 1.1px,transparent 1.4px);background-size:16px 16px}
.l-art{display:flex;justify-content:center;align-items:flex-end;padding:22px 16px 0}
.l-art svg{width:100%;max-width:460px;height:auto}
.lmain{max-width:700px;margin:0 auto;padding:24px 18px 48px}
@media(min-width:1000px){
 .lwrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
 .lside{position:sticky;top:60px;height:calc(100vh - 60px);display:flex;align-items:center;justify-content:center}
 .l-art{padding:48px;align-items:center}
 .l-art svg{max-width:600px}
 .lmain{margin:0;padding:56px 64px 72px;max-width:760px}
}
.lmain h1{font-size:clamp(30px,5vw,48px);letter-spacing:-.03em;margin-top:6px;outline:none}
.lmain .l-course{font-size:14px;color:var(--grey)}
.lmain .l-line{margin-top:8px;font-size:18px;color:var(--grey)}
.eli5{border:0;background:var(--soft)}
.scene{border:0;background-color:#fafafa}
.foot{margin-top:0}
#home .foot-space{height:72px}
.l-art{background:none;border:0}
.lside .l-art{width:100%}
@media(min-width:1000px){.lside .l-art{max-width:640px}}
:root{--ink:#111;--muted:#5c5c5c;--rule:#e5e5e5;--soft:#f5f5f5;
--display:"Delius Swash Caps","Delius","Comic Neue","Segoe Print",cursive;
--font:"Delius","Comic Neue","Trebuchet MS",ui-sans-serif,system-ui,sans-serif;
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html{font-synthesis:none;overflow-x:clip}
body{font:400 16px/1.6 var(--font);color:var(--ink);overflow-x:clip}
h1,h2,h3,h4{font-family:var(--display);font-weight:400;letter-spacing:0;line-height:1.15}
b,strong{font-weight:400}
.lbl{display:inline-block;font:500 14px/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
:focus-visible{outline:3px dashed var(--ink);outline-offset:4px;border-radius:12px}
.sr:focus{position:fixed;left:12px;top:12px;width:auto;height:auto;clip:auto;z-index:99;background:#fff;padding:8px 12px;border:2px solid var(--ink)}
.i,.s,.w{stroke:var(--ink)}
.logo{display:inline-flex;align-items:center;gap:var(--s2);font:400 24px/1 var(--display);text-decoration:none;color:var(--ink)}
.logo svg{width:38px;height:35px}
.btn{font:400 16px/1.1 var(--font);min-height:48px;padding:0 var(--s5);border:2px solid var(--ink);border-radius:var(--sk2);background:#fff;color:var(--ink);box-shadow:3px 3px 0 var(--ink);transition:transform .12s ease,box-shadow .12s ease,background .15s}
.btn:hover{transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--ink);background:#fafafa}
.btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}
.btn-ink,.btn-ink:hover{background:var(--ink);color:#fff}
.btn:disabled{opacity:.4;box-shadow:none;transform:none;cursor:not-allowed}
.btn-sm{min-height:44px;font-size:16px;padding:0 var(--s4)}
.link-btn{font:400 16px var(--font);text-decoration:none;background:var(--squig) left bottom/100% 7px no-repeat;padding:0 2px 6px;min-height:44px}
.shell{min-height:100vh}
.side{display:none}
.mtop{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;display:flex;align-items:center;justify-content:space-between;height:64px;margin:0 calc(var(--s4) * -1);padding:0 var(--s4);background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:2px solid transparent;transition:border-color .2s}
.mtop.scrolled{border-color:var(--ink)}
.pill{display:inline-flex;align-items:center;gap:var(--s2);height:38px;padding:0 var(--s3) 0 var(--s2);border:2px solid var(--ink);border-radius:var(--sk);font:500 14px var(--mono)}
.pill svg{width:20px;height:20px}
.main{width:100%;max-width:1080px;margin:0 auto;padding:0 var(--s4)}
.hello{padding:var(--s5) 0 0}
.hello h1{font-size:40px}
.hello p{margin-top:var(--s2);font-size:18px;color:var(--muted);max-width:34em}
.cont{display:grid;grid-template-columns:128px minmax(0,1fr);gap:var(--s3);align-items:center;margin-top:var(--s5);padding:var(--s2) var(--s4) var(--s2) var(--s2);background:#fff;border:2px solid var(--ink);border-radius:var(--sk);box-shadow:4px 4px 0 var(--ink);text-decoration:none;color:var(--ink);transition:transform .12s,box-shadow .12s}
.cont:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--ink);background:#fff}
.cont svg{width:128px;height:auto;overflow:hidden}
.cont-t{display:block;min-width:0}
.cont b{display:block;font:400 24px/1.2 var(--display);margin-top:var(--s1)}
.pbar{display:block;height:12px;margin:var(--s3) 0 var(--s2);border:2px solid var(--ink);border-radius:var(--sk);overflow:hidden;background:#fff}
.pbar i{display:block;height:100%;background:var(--ink)}
.cindex{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--s2);margin-top:var(--s5)}
.ci{display:grid;grid-template-columns:auto minmax(0,1fr);gap:var(--s2);align-items:center;min-height:48px;padding:var(--s2) var(--s3);background:#fff;border:2px solid var(--ink);border-radius:var(--sk);font:400 15px/1.25 var(--font);color:var(--ink);text-align:left;cursor:pointer;transition:background .15s}
.ci:nth-child(even){border-radius:var(--sk2)}
.ci:hover{background:var(--soft)}
.ci .lbl{font-size:13px;color:var(--ink)}
.course{margin-top:48px;scroll-margin-top:80px}
.c-head{display:block;padding:0;border:0}
.c-head h2{font-size:32px;margin-top:var(--s1)}
.c-line{font-size:16px;color:var(--muted);margin-top:var(--s1)}
.c-meta{display:flex;flex-wrap:wrap;gap:var(--s2) var(--s5);align-items:center;margin-top:var(--s3);font-size:inherit}
.depth{display:inline-flex;align-items:center;gap:6px}
.depth .lbl{margin-right:var(--s1)}
.depth i{width:13px;height:13px;border:2px solid var(--ink);border-radius:var(--sk);margin:0}
.depth i:first-of-type{margin-left:0}
.depth i.on{background:var(--ink)}
.lgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--s5) var(--s3);margin-top:var(--s4)}
@media(min-width:700px){.lgrid{gap:var(--s6) var(--s5)}}
.tl{position:relative;display:flex;flex-direction:column;min-width:0;text-decoration:none;color:var(--ink);background:none;border:0}
.tl-art{position:relative;display:block}
.tl-art svg{width:100%;height:auto;overflow:hidden;transition:transform .25s ease}
.tl:hover .tl-art svg{transform:rotate(-1.5deg) scale(1.03)}
.tl:hover .tl-art{transform:none}
.tl-n{margin-top:var(--s2);font-size:12px;letter-spacing:.04em}
.tl-t{display:block;font:400 16px/1.25 var(--display);margin-top:2px;padding-bottom:6px;overflow-wrap:anywhere}
.tl:hover .tl-t{background:var(--squig) left bottom/100% 6px no-repeat}
.tl-d{display:none;font-size:14px;line-height:1.4;color:var(--muted)}
@media(min-width:700px){.tl-n{font-size:14px}.tl-t{font-size:18px}}
@media(min-width:900px){.tl-d{display:block}.tl-t{font-size:24px}}
.tick{position:absolute;top:2px;right:2px;width:28px;height:28px;border-radius:var(--sk);background:var(--ink);display:grid;place-items:center}
.tick svg{width:15px;height:15px}
.foot{margin-top:72px;padding:var(--s5) 0 var(--s6);border-top:2px dashed var(--ink);text-align:center}
.powered{font:700 10px/1 var(--mono);letter-spacing:.16em;color:var(--ink);text-decoration:none}
@media(min-width:1024px){
 .shell{display:grid;grid-template-columns:288px minmax(0,1fr)}
 .side{display:flex;flex-direction:column;gap:var(--s4);position:sticky;top:0;height:100vh;overflow-y:auto;padding:var(--s5);border-right:2px solid var(--ink);background:#fff}
 .mtop,.cindex{display:none}
 .main{padding:0 48px}
 .hello{padding-top:48px}
 .hello h1{font-size:40px}
}
.side-prog{display:flex;gap:var(--s3);align-items:center;margin-top:var(--s2)}
.side-prog svg{width:52px;height:52px}
.side-prog b{display:block;font:400 18px/1.2 var(--display)}
.side-cont{width:100%}
.side-h{margin-top:var(--s2)}
.side-nav{display:flex;flex-direction:column;gap:var(--s1)}
.sn{display:grid;grid-template-columns:28px minmax(0,1fr) auto;gap:var(--s2);align-items:center;min-height:44px;padding:var(--s2) var(--s3);border:2px solid transparent;border-radius:var(--sk);background:none;font:400 16px/1.25 var(--font);color:var(--ink);text-align:left;cursor:pointer;transition:border-color .15s,background .15s}
.sn:hover{border-color:var(--rule)}
.sn.on{border-color:var(--ink);background:var(--soft)}
.sn .lbl{font-size:12px}
body.in-lesson{background:#fff}
.lbar{height:64px;border-bottom:2px solid var(--ink);gap:var(--s4);padding:0 var(--s4)}
.x{border:2px solid var(--ink);border-radius:var(--sk);background:#fff}
.x:hover{background:var(--soft)}
.lprog{height:14px;background:#fff;border:2px solid var(--ink);border-radius:var(--sk)}
.lprog i{background:var(--ink);border-radius:0}
.lside{background-color:#fafafa;background-image:radial-gradient(circle,#dedede 1.1px,transparent 1.4px);background-size:18px 18px}
@media(min-width:1000px){.lside{top:64px;height:calc(100vh - 64px);border-right:2px solid var(--ink)}}
.lmain h1{font-size:40px;margin-top:var(--s2)}
.lmain .l-course{display:block}
.lmain .l-line{font-size:18px;margin-top:var(--s2)}
.badge-done{font:500 13px var(--mono);letter-spacing:.06em;text-transform:uppercase;border-radius:var(--sk);padding:6px 12px 6px 8px}
.eli5{margin-top:var(--s5);padding:var(--s4) var(--s5);background:#fff;border:2px solid var(--ink);border-radius:var(--sk2);box-shadow:4px 4px 0 var(--ink);grid-template-columns:48px minmax(0,1fr)}
.five{width:48px;height:48px;border-radius:var(--sk);font:400 24px/1 var(--display)}
.eli5 h2{font-size:24px}
.eli5 p{font-size:18px;margin-top:var(--s1)}
.sec{display:inline-block;font:400 32px/1.15 var(--display);margin:40px 0 var(--s4);padding-bottom:10px;background:var(--squig) left bottom/100% 9px no-repeat;letter-spacing:0}
.idea{font-size:18px;line-height:1.6}
.scene{border:0;background-color:#fafafa;border-radius:var(--sk3)}
.activity{background:#fff;border:2px solid var(--ink);border-radius:var(--sk3);padding:var(--s4);margin-top:var(--s5)}
.activity h4{font:400 24px/1.2 var(--display);margin-bottom:var(--s3)}
.say{font-weight:400;font-size:16px}
.label{font:500 13px var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.pick,.tog,.opt,.block,.next,.ans,.qcard,.prompt-out,.chat,.tile{border:2px solid var(--ink);border-radius:var(--sk);font-family:var(--font);font-weight:400}
.pick:nth-child(even),.ans:nth-child(even),.tog:nth-child(even),.block:nth-child(even){border-radius:var(--sk2)}
.block{border-style:dashed}.block[aria-pressed="true"]{border-style:solid}
.pick.no,.ans.wrong{border-style:dashed;border-color:#b5b5b5}
.ans{font-size:16px;padding:12px 16px;min-height:52px;transition:background .15s,transform .12s}
.ans:hover:not(:disabled){background:var(--soft)}
.ans:active:not(:disabled){transform:scale(.99)}
.q{font:400 24px/1.25 var(--display);margin-bottom:var(--s4)}
.next b{font-weight:400}
.next .bar,.meter i,.steps-dots i{border:2px solid var(--ink);border-radius:var(--sk)}
.pn{border:2px solid var(--ink);border-radius:var(--sk);font:500 14px var(--mono)}
.points p{font-size:18px}
.story{font:400 22px/1.6 var(--display)}
.cap{font-size:16px}
.deeper{border-top:2px dashed var(--ink);border-bottom:2px dashed var(--ink);margin-top:var(--s5)}
.deeper summary{font:400 24px var(--display);min-height:56px}
.deeper p{font-size:16px;color:#222}
.done-card{border-radius:var(--sk);background:var(--ink)}
.done-head{font:400 24px var(--display)}
.remember{font-size:18px}
.remember span:first-child{font-family:var(--display)}
.done-card .btn{box-shadow:3px 3px 0 #fff;border-color:#fff}
.l-nav{border-top:2px dashed var(--ink)}
.l-step{border:2px solid var(--ink);border-radius:var(--sk)}
.l-step.next{border-radius:var(--sk2)}
.l-step:hover{background:var(--soft);border-color:var(--ink)}
.l-step small{font:500 12px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.l-step b{font:400 18px/1.25 var(--display)}
.lpage .foot{margin-top:0}
@media (max-width:420px){.hello h1{font-size:32px}.lmain h1{font-size:32px}.sec{font-size:24px}.c-head h2{font-size:24px}.cont b{font-size:18px}.cont{grid-template-columns:104px minmax(0,1fr)}.cont svg{width:104px}}
:root{--display:"Bricolage Grotesque","Figtree",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;--font:"Figtree",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
body{font-family:var(--font)}
h1,h2,h3,h4,.sec,.q,.activity h4,.deeper summary,.done-head,.eli5 h2,.c-head h2,.cont b,.l-step b,.tl-t,.side-prog b,.logo,.five,.remember b{font-family:var(--display);font-weight:700;letter-spacing:-.02em}
b,strong{font-weight:700}
.hello h1,.lmain h1{font-weight:800;letter-spacing:-.035em;line-height:1.05}
.story{font-family:var(--font);font-weight:600;letter-spacing:-.01em}
.btn,.ci,.sn,.ans,.pick,.tog,.block,.next,.link-btn{font-family:var(--font);font-weight:600}
.next b{font-weight:700}
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.lgrid{grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--s6) var(--s4)}
@media(min-width:700px){.lgrid{gap:40px var(--s6)}}
.tl-t{font-size:18px;letter-spacing:-.015em}
.tl-d{display:block;font-size:14px}
@media(min-width:700px){.tl-t{font-size:22px}.tl-d{font-size:16px}}
@media(min-width:1024px){.main{max-width:980px}.tl-t{font-size:24px}}
:root{--sk:14px;--sk2:14px;--sk3:18px;--squig:none;--line:#111;--soft:#f4f4f4;--rule:#e6e6e6;--muted:#5d5d5d}
.btn,.cont,.eli5,.done-card .btn{box-shadow:none}
.btn{border-width:1.5px;border-radius:12px}
.btn:hover{transform:none;box-shadow:none;background:#f2f2f2}
.btn-ink:hover{background:#2b2b2b}
.btn:active{transform:scale(.98);box-shadow:none}
.cont{border:1.5px solid var(--line);border-radius:18px}
.cont:hover{transform:none;box-shadow:none;background:#fafafa}
.eli5{border:0;background:var(--soft);border-radius:18px;margin-top:20px}
.pick,.tog,.opt,.block,.next,.ans,.qcard,.prompt-out,.chat,.tile,.ci,.x,.pill,.l-step{border-width:1.5px;border-radius:12px}
.ci:nth-child(even),.pick:nth-child(even),.ans:nth-child(even),.tog:nth-child(even),.block:nth-child(even){border-radius:12px}
.activity{border:1px solid var(--rule);border-radius:16px;background:#fff}
.sec{background:none;padding-bottom:0;margin:0}
.link-btn{background:none;text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:5px;padding:0 2px}
.tl:hover .tl-t{background:none;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:5px}
.depth i{border-radius:50%;border-width:1.5px}
.tick{border-radius:50%}
.foot{border-top:1px solid var(--rule)}
.mtop.scrolled{border-color:var(--rule)}
.side{border-right:1px solid var(--rule)}
.lbar{border-bottom:1px solid var(--rule)}
.deeper{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
html.big body{font-size:18px}
html.big .eli5 p,html.big .points p,html.big .idea,html.big .talk p{font-size:21px}
html.big .ans,html.big .oitem{font-size:18px}
.main{padding-bottom:calc(88px + env(safe-area-inset-bottom,0px))}
.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:40;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:2px;padding:6px 6px calc(6px + env(safe-area-inset-bottom,0px));background:rgba(255,255,255,.97);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-top:1px solid var(--rule)}
.tabbar a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;min-height:54px;padding:6px 2px;border-radius:12px;text-decoration:none;color:var(--muted);font:600 12px/1.1 var(--font);text-align:center}
.tabbar svg{width:24px;height:24px}
.tabbar a[aria-current="page"]{color:var(--ink);background:var(--soft)}
.snav{display:flex;flex-direction:column;gap:2px}
.snav a{display:flex;align-items:center;gap:12px;min-height:44px;padding:8px 12px;border-radius:12px;text-decoration:none;color:var(--ink);font:600 16px var(--font)}
.snav svg{width:22px;height:22px}
.snav a:hover{background:var(--soft)}
.snav a[aria-current="page"]{background:var(--ink);color:#fff}
.snav a[aria-current="page"] .i{stroke:#fff}
@media(min-width:1024px){.tabbar{display:none}.main{padding-bottom:0}}
.who{display:flex;align-items:center;gap:10px;width:100%;padding:8px 10px;border:1px solid var(--rule);border-radius:14px;background:#fff;cursor:pointer;text-align:left;font:700 15px/1.2 var(--font);color:var(--ink)}
.who:hover{background:var(--soft)}
.who svg{width:40px;height:40px;border-radius:50%;background:var(--soft);flex:0 0 auto}
.who small{display:block;font:500 11px var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.chips2{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.chip2{display:inline-flex;align-items:center;gap:6px;min-height:34px;padding:4px 12px;border-radius:999px;background:var(--soft);font:600 14px var(--font)}
.chip2 svg{width:18px;height:18px}
.c-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.tl-art{aspect-ratio:4/3}
.tl-art:empty{background:var(--soft);border-radius:16px}
.course{content-visibility:auto;contain-intrinsic-size:auto 1100px}
.tag{display:inline-flex;align-items:center;min-height:26px;padding:2px 10px;border-radius:999px;background:var(--soft);font:500 12px var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--ink)}
.tag-ink{background:var(--ink);color:#fff}
.lpage{padding-bottom:calc(92px + env(safe-area-inset-bottom,0px))}
.sdots{display:flex;gap:6px;align-items:center;justify-content:center}
.sdots i{width:26px;height:6px;border-radius:9px;background:#e2e2e2;transition:background .2s}
.sdots i.on{background:var(--ink)}
.lstep{display:none}
.lstep.on{display:block;animation:rise .25s ease}
.lstep-h{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:26px 0 14px}
.lstep-h h2{margin:0;font-size:24px}
.eli5 .lstep-h{margin:0 0 6px}
.eli5 .lstep-h h2{font-size:20px}
.listen{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;min-width:40px;padding:4px 12px;border-radius:999px;border:1.5px solid var(--line);background:#fff;font:600 14px var(--font);color:var(--ink);cursor:pointer;flex:0 0 auto}
.listen svg{width:18px;height:18px}
.listen.playing{background:var(--ink);color:#fff}
.listen.playing .i{stroke:#fff}
.lnav{position:fixed;left:0;right:0;bottom:0;z-index:40;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px;padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));background:rgba(255,255,255,.97);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-top:1px solid var(--rule)}
.lnav .lbl{text-align:center;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}
.lnav .btn{min-width:92px}
@media(min-width:1000px){.lnav{left:50%}}
.lhead .l-line{margin-top:6px}
.ltags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.lpage:not([data-step="eli5"]) .l-line,.lpage:not([data-step="eli5"]) .ltags{display:none}
.lpage:not([data-step="eli5"]) .lmain h1{font-size:26px}
@media(max-width:999px){.lpage[data-step="learn"] .lside,.lpage[data-step="do"] .lside,.lpage[data-step="check"] .lside{display:none}}
.en-note{margin-top:12px;font-size:14px;color:var(--muted)}
.slots{list-style:none;display:grid;gap:8px;margin:0 0 14px;padding:0}
.slots li{display:grid;grid-template-columns:32px minmax(0,1fr);gap:12px;align-items:center;min-height:52px;padding:8px 12px;border:1.5px dashed #c9c9c9;border-radius:12px;color:var(--muted)}
.slots li.filled{border-style:solid;border-color:var(--ink);color:var(--ink);animation:pop .3s ease}
.oitems{display:grid;gap:8px}
.oitem{display:block;width:100%;text-align:left;min-height:52px;padding:10px 14px;border:1.5px solid var(--ink);border-radius:12px;background:#fff;font:600 16px/1.4 var(--font);color:var(--ink);cursor:pointer}
.oitem:hover:not(:disabled){background:var(--soft)}
.oitem.used{opacity:.3;cursor:default}
.arow{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px;align-items:stretch}
.arow+.arow{margin-top:8px}
.arow .listen{border-radius:12px;min-height:50px}
.lside{position:relative}
.react{position:absolute;inset:0;pointer-events:none}
.react svg{position:absolute;left:10%;top:6%;width:80%;height:auto;animation:pop .45s ease}
.react .bub{position:absolute;top:8%;right:8%;padding:8px 14px;border-radius:16px;background:var(--ink);color:#fff;font:700 18px var(--display);animation:pop .35s ease}
.l-art.yay svg{animation:hop .6s ease 2}
.l-art.oops svg{animation:shake .4s ease}
.lstep .done-card{margin-top:22px}
.mast{margin-top:10px;font:500 13px var(--mono);letter-spacing:.05em;text-transform:uppercase;color:#d0d0d0}
.talk p{font-size:18px;line-height:1.55}
.powered-l{margin-top:40px;text-align:center}
.vh{padding:24px 0 0}
.vh h1{font-size:34px}
.vh p{margin-top:8px;color:var(--muted);font-size:17px;max-width:36em}
.panel{margin-top:22px;padding:18px;border:1px solid var(--rule);border-radius:18px;background:#fff}
.panel h2{font-size:22px;margin-bottom:12px}
.wrow{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:20px}
.stat{padding:14px;border-radius:16px;background:var(--soft)}
.stat b{display:block;font:800 30px/1 var(--display)}
.stat span{display:block;margin-top:6px;font:500 11px/1.3 var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.map svg{width:100%;max-width:520px;height:auto;margin:0 auto}
.stickers{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.stk{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;font:600 12px/1.25 var(--font)}
.stk svg{width:100%;max-width:84px;height:auto}
.stk.off{opacity:.32}
.rmeta{display:flex;gap:12px;align-items:center}
.rmeta svg{width:96px;height:auto;flex:0 0 auto}
.rt{display:block;font:700 18px/1.25 var(--display)}
.gli,.tcard,.lrn{display:grid;gap:12px;align-items:center;padding:12px 0;border-top:1px solid var(--rule)}
.gli{grid-template-columns:44px minmax(0,1fr) auto}
.tcard{grid-template-columns:minmax(0,1fr) auto}
.lrn{grid-template-columns:44px minmax(0,1fr) auto}
.gli svg{width:44px;height:44px}
.lrn svg{width:44px;height:44px;border-radius:50%;background:var(--soft)}
.gli b,.tcard b,.lrn b{display:block;font:700 17px/1.25 var(--display)}
.gli span,.tcard span,.lrn span{display:block;font-size:15px;line-height:1.4;color:var(--muted)}
.idea-list details{border-top:1px solid var(--rule);padding:10px 0}
.idea-list summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;font:700 17px var(--display);min-height:36px}
.idea-list summary::-webkit-details-marker{display:none}
.idea-list ul{margin:6px 0 0 18px;padding:0}
.idea-list li{font-size:15px;line-height:1.7}
.toggle{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;padding:12px 0;border-top:1px solid var(--rule)}
.switch{width:52px;height:30px;border-radius:999px;border:1.5px solid var(--ink);background:#fff;position:relative;cursor:pointer;flex:0 0 auto}
.switch::after{content:"";position:absolute;top:3px;left:3px;width:21px;height:21px;border-radius:50%;background:var(--ink);transition:transform .2s}
.switch[aria-checked="true"]{background:var(--ink)}
.switch[aria-checked="true"]::after{transform:translateX(21px);background:#fff}
.seg{display:flex;flex-wrap:wrap;gap:8px}
.seg button{min-height:44px;padding:0 16px;border:1.5px solid var(--line);border-radius:999px;background:#fff;font:600 15px var(--font);color:var(--ink);cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--ink);color:#fff}
.inp{width:100%;min-height:48px;padding:10px 14px;border:1.5px solid var(--line);border-radius:12px;font:500 16px var(--font);color:var(--ink);background:#fff}
select.inp{max-width:100%}
.danger{border-style:dashed}
.welcome{min-height:100vh;display:flex;justify-content:center;padding:28px 16px calc(32px + env(safe-area-inset-bottom,0px))}
.wbox{width:100%;max-width:560px}
.wbox h1{font-size:34px;margin-top:18px}
.wbox>p{margin-top:8px;color:var(--muted);font-size:18px}
.wsec{margin-top:22px}
.wsec>.lbl{margin-bottom:8px}
.who-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.who-card{display:flex;flex-direction:column;align-items:center;gap:6px;padding:10px 8px 12px;border:1.5px solid var(--rule);border-radius:16px;background:#fff;cursor:pointer;font:700 15px var(--font);color:var(--ink)}
.who-card svg{width:100%;max-width:140px;height:auto}
.who-card:hover{border-color:#bdbdbd}
.who-card[aria-pressed="true"]{border-color:var(--ink);background:var(--soft)}
.cert{position:relative;max-width:640px;margin:24px auto 0;padding:40px 28px;text-align:center;background:#fff}
.cert-frame{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.cert h2{font-size:28px;margin-top:6px}
.cert .cname{margin-top:18px;font:800 40px/1.1 var(--display)}
.cert p{margin-top:10px;font-size:18px}
.cert .cpip{width:96px;height:auto;margin:14px auto 0}
.sheet{max-width:720px;margin:20px auto 0}
.sheet h1{font-size:30px;margin-top:8px}
.sheet-art svg{width:220px;height:auto;margin-top:8px}
.sheet .box{margin-top:14px;padding:14px 16px;border:1.5px solid var(--ink);border-radius:12px}
.sheet .box b{display:block;font:700 17px var(--display);margin-bottom:6px}
.sheet .draw{min-height:220px}
.sheet .line{height:30px;border-bottom:1.5px solid #9a9a9a}
.sheet ol{padding-left:20px}
.sheet .opt-line{display:flex;gap:10px;align-items:center;margin-top:8px}
.sheet .opt-line i{width:20px;height:20px;border:1.5px solid var(--ink);border-radius:4px;flex:0 0 auto}
@media print{.tabbar,.side,.mtop,.foot,.no-print,.lnav,.sr{display:none!important}.view:not(.print-me){display:none!important}.shell{display:block!important}.main{padding:0!important;max-width:none!important}body{font-size:14px}.course{content-visibility:visible}}
:root{--hl:#FFF01F;--hl-soft:#FFFAB8}
::selection{background:var(--hl);color:#111}
.hl,.hl-u,.lstep-h h2,.vh h1{-webkit-box-decoration-break:clone;box-decoration-break:clone;background-repeat:no-repeat}
.hl,.eli5 .lstep-h h2{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 40' preserveAspectRatio='none'%3E%3Cpath d='M5 8 C60 4 120 7 196 4 L192 35 C130 38 66 33 3 37 Z' fill='%23FFF01F'/%3E%3Cpath d='M12 13 C80 10 140 13 190 11 L188 30 C120 33 60 29 9 31 Z' fill='%23F2E400' fill-opacity='.35'/%3E%3C/svg%3E");background-size:100% 80%;background-position:0 65%;padding:0 .14em;margin:0 -.06em}
.hl-u,.lstep-h h2,.vh h1{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 20' preserveAspectRatio='none'%3E%3Cpath d='M3 6 C60 2 130 5 198 2 L196 16 C130 19 64 15 2 18 Z' fill='%23FFF01F'/%3E%3C/svg%3E");background-size:100% .48em;background-position:0 90%;padding:0 .06em}
.lstep-h h2,.vh h1{width:fit-content}
.eli5 .lstep-h h2{margin:0}
.ans.right{background:var(--hl);color:var(--ink);border-color:var(--ink)}
.slots li.filled{background:var(--hl-soft)}
.five{background:var(--hl);color:var(--ink);border:1.5px solid var(--ink)}
.tabbar a[aria-current="page"]{background:var(--hl);color:var(--ink)}
.snav a[aria-current="page"]{background:var(--hl);color:var(--ink)}
.snav a[aria-current="page"] .i{stroke:var(--ink)}
.sn.on{background:var(--hl);border-color:var(--ink)}
.tag-ink{background:var(--hl);color:var(--ink)}
.chip2{background:var(--hl-soft)}
.cont-t>.lbl:first-child{display:inline-block;width:fit-content;padding:3px 8px;border-radius:6px;background:var(--hl);color:var(--ink)}
.pbar i{background:var(--hl)}
.done-card .done-head svg circle{fill:var(--hl)}
.done-card .remember b{color:var(--hl)}
.who-card[aria-pressed="true"]{background:var(--hl-soft);border-color:var(--ink)}
.switch[aria-checked="true"]{background:var(--hl)}
.switch[aria-checked="true"]::after{background:var(--ink)}
.f-hl{fill:var(--hl)}
.f-hls{fill:url(#p-hl)}
.hlf{fill:var(--hl);stroke:var(--ink);stroke-width:var(--sw,2.5)}
.stk:not(.off) .f-mint{fill:var(--hl)}
.logo{display:inline-flex;flex-direction:column;align-items:stretch;align-self:flex-start;width:max-content;max-width:100%;gap:4px;font:inherit;text-decoration:none;color:var(--ink)}
.logo .lg-row{display:flex;align-items:center;gap:8px}
.logo .lg-row svg{width:34px;height:31px;flex:0 0 auto}
.logo .lg-name{font:800 27px/1 var(--display);letter-spacing:-.045em}
.logo .lg-sub{display:flex;justify-content:space-between;font:700 9px/1 var(--mono);color:var(--ink)}
.logo .lg-sub i{font-style:normal}
.mtop .logo .lg-row svg{width:30px;height:27px}
.mtop .logo .lg-name{font-size:24px}
.sbtn{display:flex;align-items:center;gap:14px;width:100%;min-height:60px;padding:10px 16px;border:1.5px solid var(--ink);border-radius:14px;background:#fff;color:var(--ink);text-align:left;cursor:pointer;font:600 16px/1.25 var(--font)}
.sbtn+.sbtn{margin-top:10px}
.sbtn svg{width:24px;height:24px;flex:0 0 auto}
.sbtn b{display:block;font-weight:700}
.sbtn small{display:block;margin-top:2px;font-size:13px;font-weight:500;color:var(--muted)}
.sbtn:hover{background:var(--hl-soft)}
.sbtn:disabled{opacity:.5;cursor:default}
.ordiv{display:flex;align-items:center;gap:12px;margin:20px 0 0;color:var(--muted);font:500 12px var(--mono);letter-spacing:.08em;text-transform:uppercase}
.ordiv::before,.ordiv::after{content:"";flex:1;height:1px;background:var(--rule)}
.phone-row{display:grid;grid-template-columns:minmax(0,8em) minmax(0,1fr);gap:8px}
.wbox .panel .lbl{display:block;margin:14px 0 6px}
.msg{margin-top:12px;min-height:1.3em;font-size:15px}
.msg:empty{display:none}
.msg.err{font-weight:700}
.msg.err::before{content:"!";display:inline-grid;place-items:center;width:20px;height:20px;margin-right:8px;border-radius:50%;background:var(--ink);color:var(--hl);font:700 13px var(--mono)}
.code-inp{font:700 26px var(--mono);letter-spacing:.35em;text-align:center}
.legal{margin-top:12px;font-size:13px;color:var(--muted)}
.legal a{color:var(--ink)}
.wrow-c{justify-content:center}
.sent-box{display:flex;gap:12px;align-items:flex-start;margin-top:4px;padding:14px;border-radius:12px;background:var(--hl-soft)}
.sent-box svg{width:24px;height:24px;flex:0 0 auto;margin-top:2px}
.sent-box p{margin:0;font-weight:600}
.toggle .vrow{display:flex;gap:8px;align-items:center;flex:1 1 100%}
.toggle .vrow .inp{flex:1;min-width:0}
.toggle>.say{flex:1 1 100%;margin:0}
.main{display:flex;flex-direction:column;min-height:100vh}
.main>.foot{margin-top:auto}
.lpage{display:flex;flex-direction:column;min-height:100vh}
.lpage>.lwrap{flex:1 0 auto;width:100%}
.lfoot{padding:20px 16px 8px;text-align:center}
.welcome{flex-direction:column;align-items:center;justify-content:flex-start;padding:44px 20px calc(20px + env(safe-area-inset-bottom,0px))}
.welcome>.wbox{flex:1 0 auto;max-width:440px}
.welcome>.powered-l{margin-top:32px}
.wbox h1{font-size:30px;margin-top:30px}
.wbox>p{font-size:16px}
.wsec{margin-top:30px}
.wbox .inp{max-width:360px}
.who-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;max-width:360px}
.who-card{flex-direction:row;justify-content:flex-start;align-items:center;gap:10px;padding:8px 12px;min-height:60px;border-radius:14px;font-size:14px;text-align:left}
.who-card svg{width:44px;max-width:44px;height:44px;border-radius:50%;background:var(--soft);flex:0 0 auto}
.bigp p{font-size:18px;line-height:1.65;margin:0 0 12px;padding:4px 8px;margin-left:-8px;border-radius:10px}
.sub{font:700 20px var(--display);margin:22px 0 10px}
.exs{display:grid;gap:10px}
@media(min-width:700px){.exs{grid-template-columns:repeat(3,minmax(0,1fr))}}
.exc{padding:14px;border:1.5px solid var(--ink);border-radius:14px;background:#fff}
.exc b{display:block;font:700 16px/1.3 var(--display);margin-bottom:6px}
.exc span{display:block;font-size:15px;line-height:1.5;color:var(--muted)}
.lstep .deeper{margin-top:22px}
.lstep[data-s="try"] .deeper{display:none}
.qnum{margin-top:4px}
.ans{display:flex;align-items:center;gap:12px;text-align:left}
.ans .ltr{flex:0 0 auto;display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;border:1.5px solid currentColor;font:700 14px var(--mono)}
.ans .atx{flex:1}
.reading{background:var(--hl-soft)!important;box-shadow:0 0 0 3px var(--hl);border-radius:10px;transition:background .15s,box-shadow .15s}
.stopper{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(84px + env(safe-area-inset-bottom,0px));z-index:60;display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:8px 18px;border-radius:999px;border:0;background:var(--ink);color:#fff;font:700 15px var(--font);box-shadow:0 6px 24px rgba(0,0,0,.18);cursor:pointer}
.stopper svg{width:14px;height:14px}
.stopper[hidden]{display:none}
.lbar-r{display:flex;align-items:center;gap:10px}
.vt{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:4px 12px;border-radius:999px;border:1.5px solid var(--line);background:#fff;font:600 13px var(--font);color:var(--ink);cursor:pointer}
.vt svg{width:16px;height:16px}
.vt[aria-pressed="true"]{background:var(--hl);border-color:var(--ink)}
.vt[hidden]{display:none}
@media(max-width:420px){.vt span{display:none}}
.js #ssr{display:none}
.ssr,.page{max-width:780px;margin:0 auto;padding:16px 18px 32px;font-size:17px;line-height:1.65;width:100%}
.ssr-top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:12px 0 16px;border-bottom:1px solid var(--rule)}
.ssr-top nav a{margin-left:14px;font-weight:600;color:var(--ink)}
.ssr h1,.page h1{font:800 clamp(30px,6vw,44px)/1.08 var(--display);letter-spacing:-.03em;margin:20px 0 8px}
.ssr h2,.page h2{font:700 24px/1.2 var(--display);margin:28px 0 8px}
.ssr h3{font:700 19px/1.3 var(--display);margin:18px 0 4px}
.crumbs{font-size:14px;color:var(--muted);margin-top:14px}
.crumbs a{color:var(--muted)}
.ssr .lead,.page .lead{font-size:20px;color:var(--muted)}
.ssr .eli{padding:16px 18px;border-radius:16px;background:var(--soft)}
.ssr ul,.ssr ol,.page ul,.page ol{padding-left:22px}
.ssr dt{font-weight:700;margin-top:14px}
.ssr dd{margin:4px 0 0}
.pn{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:32px}
.site-foot{margin-top:auto;padding:22px 16px 18px;border-top:1px solid var(--rule);text-align:center;font-size:14px}
.site-foot nav a{margin:0 8px;color:var(--ink)}
.site-foot .powered{display:inline-block;margin-top:12px}
.stat-body{display:flex;flex-direction:column;min-height:100vh}
.stat-body>main{flex:1 0 auto}