@font-face{font-family:Heebo;src:url('/assets/heebo-regular.woff') format('woff');font-weight:100 599;font-display:swap}
@font-face{font-family:Heebo;src:url('/assets/heebo-bold.woff') format('woff');font-weight:600 900;font-display:swap}
:root{--paper:#f5f6f2;--white:#fff;--ink:#17251b;--muted:#647065;--line:#d9ded4;--lime:#c3f35a;--lime-ink:#d0fc79;--forest:#172b20;--deep:#111f17;--font:Heebo,Arial,sans-serif;--radius:24px;--header:92px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:1rem;line-height:1.7;-webkit-font-smoothing:antialiased}body.dialog-open{overflow:hidden}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{color:inherit;cursor:pointer}button:disabled{cursor:default}img,svg{display:block;max-width:100%}img{object-fit:cover}button{border:0;background:none}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.12}h1,h2{font-weight:800;letter-spacing:-.045em}h3{font-weight:700;letter-spacing:-.025em}::selection{background:var(--lime);color:var(--ink)}:focus-visible{outline:3px solid #568410;outline-offset:5px}section[id]{scroll-margin-top:20px}[hidden]{display:none!important}.section-shell{width:min(1380px,calc(100% - 100px));margin-inline:auto}.section-pad{padding-block:114px}.eyebrow{display:flex;align-items:center;gap:11px;font-size:.875rem;font-weight:500;letter-spacing:.005em;margin-bottom:30px}.eyebrow-line{height:1px;width:30px;background:currentColor}.muted{color:#7c877a}.small-label{font-size:.875rem;font-weight:500;display:block}.button{display:inline-flex;align-items:center;justify-content:center;gap:24px;min-height:50px;border-radius:100px;padding:12px 24px;font-weight:600;font-size:.9375rem;transition:background .25s,transform .25s,box-shadow .25s;text-align:center;line-height:1.4}.button>span[aria-hidden]{font-size:1.45rem;line-height:1}.button-dark{background:var(--ink);color:white}.button-dark:hover{background:#304931;transform:translateY(-3px);box-shadow:0 8px 20px #17251b12}.button-lime{background:var(--lime);color:var(--ink)}.button-lime:hover{background:#d4ff81;transform:translateY(-2px)}.button-large{min-height:60px;padding-inline:27px;font-size:1rem}.button-full{width:100%;justify-content:space-between}.text-link{display:inline-flex;align-items:center;gap:13px;font-size:.9375rem;font-weight:500;min-height:44px}.text-link span{transition:transform .2s}.text-link:hover span{transform:translate(-3px,-3px)}.text-link:hover{text-decoration:underline;text-underline-offset:6px}.skip-link{position:fixed;top:10px;right:10px;background:var(--ink);color:white;border-radius:7px;padding:12px 22px;z-index:200;transform:translateY(-180%)}.skip-link:focus{transform:none}.reading-progress{height:3px;position:fixed;top:0;right:0;left:0;z-index:110;pointer-events:none}.reading-progress span{display:block;height:100%;background:#87b52f;transform:scaleX(0);transform-origin:right}.site-header{height:var(--header);padding-inline:max(35px,calc((100vw - 1380px)/2));display:flex;justify-content:space-between;align-items:center;gap:30px;position:sticky;top:0;z-index:100;background:#f5f6f2ed;backdrop-filter:blur(16px);border-bottom:1px solid transparent;transition:border-color .3s}.site-header.scrolled{border-bottom-color:var(--line)}.brand{display:inline-flex;align-items:center;gap:12px;font-weight:700;font-size:1.2rem;line-height:1.3;white-space:nowrap}.brand>span:last-child{padding-top:2px}.brand small{display:block;font-size:.75rem;font-weight:400;color:var(--muted);line-height:1.8;letter-spacing:0;margin-top:3px}.brand-mark{background:var(--ink);color:var(--lime);width:44px;height:46px;border-radius:13px 13px 4px 13px;font:bold italic 37px/46px Georgia,serif;position:relative;text-align:center;padding-right:5px;direction:ltr}.brand-mark span{position:absolute;right:0;top:-7px;font:22px/1.4 Arial,sans-serif}.desktop-nav{display:flex;gap:28px;align-items:center}.desktop-nav a{font-size:.875rem;min-height:44px;display:flex;align-items:center;position:relative}.desktop-nav a:after{content:'';height:2px;background:var(--ink);position:absolute;bottom:5px;right:0;width:100%;transform:scaleX(0);transform-origin:right;transition:transform .2s}.desktop-nav a:hover:after{transform:scaleX(1)}.header-cta{min-height:46px;padding:10px 23px}.menu-toggle{display:none;width:46px;height:46px;align-items:center;justify-content:center;flex-direction:column;gap:6px}.menu-toggle span{display:block;width:23px;height:2px;background:var(--ink);transition:transform .25s}.menu-toggle[aria-expanded=true] span:first-child{transform:translateY(4px) rotate(45deg)}.menu-toggle[aria-expanded=true] span:last-child{transform:translateY(-4px) rotate(-45deg)}.mobile-nav{position:fixed;z-index:99;top:var(--header);left:0;right:0;background:var(--paper);padding:12px 24px 25px;border-bottom:1px solid var(--line);box-shadow:0 20px 30px #17251b0d}.mobile-nav a{display:block;padding:14px 6px;font-weight:500;border-bottom:1px solid var(--line)}
.hero{position:relative;min-height:790px;display:grid;grid-template-columns:1.12fr .88fr;align-items:center;column-gap:45px;padding-top:56px;padding-bottom:110px}.hero-copy{position:relative;z-index:3;padding-bottom:20px}.hero .eyebrow{margin-bottom:27px}.hero h1{font-size:clamp(4.25rem,7.1vw,6.65rem);line-height:1.04;letter-spacing:-.058em;margin-right:-5px}.highlight{display:inline-block;position:relative;z-index:0;white-space:nowrap}.highlight:before{content:'';background:var(--lime);position:absolute;top:24%;right:-7px;bottom:4%;left:-8px;z-index:-1;transform:rotate(1deg)}.highlight svg{position:absolute;bottom:-17px;right:0;width:100%;height:15px;overflow:visible}.highlight path{fill:none;stroke:var(--ink);stroke-width:3.5;stroke-linecap:round;stroke-dasharray:600;stroke-dashoffset:600;animation:underline-in 1.2s .7s forwards}.hero-description{font-size:1.1rem;line-height:1.9;margin-top:37px;color:#59665b;max-width:490px}.hero-actions{display:flex;align-items:center;gap:22px;margin-top:27px;flex-wrap:wrap}.hero-actions .text-link{font-size:.875rem}.hero-meta{display:flex;flex-wrap:wrap;align-items:center;gap:0;margin-top:26px;color:#657363;font-size:.8125rem}.hero-meta span+span:before{content:'/';margin-inline:13px;color:#a3ae9f}.hero-visual{position:relative;min-width:0;height:584px;display:flex;align-items:center;justify-content:center;align-self:center;margin-bottom:15px}.portrait-frame{height:526px;width:100%;border-radius:180px 180px 22px 22px;overflow:hidden;position:relative;transform:rotate(-5deg);background:#b8c9d1;box-shadow:0 16px 38px #16261d10;will-change:transform}.portrait{position:absolute;width:100%;height:125%;top:-24%;left:0;object-fit:cover;object-position:50% 80%;filter:saturate(.78)}.portrait-shade{position:absolute;inset:0;background:linear-gradient(180deg,transparent 48%,#10231b09 58%,#10231bd4 100%)}.portrait-caption{position:absolute;right:29px;bottom:27px;left:20px;color:white;display:flex;flex-direction:column}.caption-kicker{font-size:.9375rem}.caption-name{font-size:2.45rem;font-weight:700;line-height:1.35;letter-spacing:-.04em}.caption-detail{font-size:.8125rem;color:#e0e6df;margin-top:6px}.photo-grid{position:absolute;inset:7% -22px 0 -10px;background-image:linear-gradient(#bec5b746 1px,transparent 1px),linear-gradient(90deg,#bec5b746 1px,transparent 1px);background-size:25px 25px;transform:rotate(4deg);border-radius:48% 48% 0 0;mask-image:linear-gradient(0deg,transparent,#000 25%,#000 82%,transparent)}.coordinate{position:absolute;direction:ltr;font:10px/1.5 'Courier New',monospace;letter-spacing:.14em;color:#788373;z-index:1}.coord-top{left:18px;top:9px;transform:rotate(-5deg)}.coord-bottom{bottom:-15px;right:18px}.grade-sticker{position:absolute;top:53px;left:-30px;z-index:4;width:166px;padding:15px 19px 17px;background:var(--lime);border-radius:18px;transform:rotate(8deg);box-shadow:0 12px 25px #17251b18;display:flex;flex-direction:column;line-height:1.6}.sticker-number{font:500 4.3rem/1.08 Georgia,serif;letter-spacing:-.055em;display:flex;align-items:flex-start;justify-content:space-between;direction:ltr}.sticker-number>span{font-family:var(--font);font-size:1.5rem;line-height:1.5;letter-spacing:0}.grade-sticker>span:last-child{font-size:.75rem;margin-top:6px}.grade-sticker b{font-size:.75rem;font-weight:500}.formula-sticker{position:absolute;bottom:7px;right:-29px;z-index:4;background:var(--white);border:1px solid #e5e9df;box-shadow:0 12px 22px #17251b0b;transform:rotate(4deg);border-radius:14px;padding:16px 25px;display:flex;flex-direction:column;gap:3px}.formula-sticker span{font-size:.75rem;color:var(--muted)}.formula-sticker b{font-size:1.05rem;letter-spacing:-.02em}.scroll-cue{position:absolute;bottom:34px;right:0;left:0;display:flex;align-items:center;gap:12px;font-size:.8125rem;color:#6d7969}.scroll-icon{border:1px solid var(--line);border-radius:50%;width:32px;height:39px;display:grid;place-items:center;color:var(--ink)}.scroll-rule{height:1px;background:var(--line);flex:1;margin-right:22px}.ticker{overflow:hidden;background:var(--lime);padding-block:16px;border-block:1px solid #accf67;user-select:none;direction:ltr}.ticker-track{display:flex;align-items:center;width:max-content;gap:46px;animation:ticker 36s linear infinite}.ticker-track>span{font-size:1.75rem;font-weight:700;letter-spacing:-.035em;direction:rtl}.ticker-track i{font:normal 2.15rem/1 Georgia,serif}.intro-row{display:flex;align-items:flex-end;justify-content:space-between;gap:40px}.intro-row h2,.about h2,.lesson h2,.questions h2{font-size:clamp(2.75rem,4.4vw,4.05rem)}.intro-row>p{color:var(--muted);font-size:1rem;line-height:1.85;max-width:370px;padding-bottom:4px}.section-intro{margin-bottom:45px}.level-tabs{display:grid;grid-template-columns:repeat(3,1fr);border-bottom:1px solid #cdd5c7}.level-tab{font-size:1.15rem;display:flex;gap:12px;align-items:center;min-height:74px;border-bottom:3px solid transparent;padding:18px 25px;text-align:right;transition:background .25s,border-color .25s;color:#667161}.level-tab>span:first-child{font-size:.75rem;font-weight:400;direction:ltr;color:#75866c}.level-tab .tab-arrow{margin-right:auto;opacity:0;transition:opacity .2s}.level-tab:hover{background:#e8eddf}.level-tab[aria-selected=true]{font-weight:600;color:var(--ink);border-color:var(--ink);background:#e9eddf}.level-tab[aria-selected=true] .tab-arrow{opacity:1}.level-panel{display:grid;grid-template-columns:1.1fr .9fr;background:#e9eddf;min-height:390px;border-radius:0 0 22px 22px;overflow:hidden;animation:panel-in .35s ease-out}.level-content{padding:39px 43px}.level-content .small-label{margin-bottom:15px;color:#586f4b}.level-content h3{font-size:2.15rem;line-height:1.22}.level-content>p{margin-top:18px;max-width:480px;color:#52624d;font-size:.9375rem;line-height:1.85}.topic-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;margin-bottom:15px}.topic-tags span{padding:4px 11px;background:#f6f8ef;border:1px solid #d1dbc4;border-radius:50px;font-size:.75rem;color:#43583c}.level-content .text-link{font-size:.875rem}.level-diagram{margin:40px 38px 32px 20px;position:relative;display:flex;flex-direction:column;justify-content:center}.diagram-label{font:10px/1.5 'Courier New',monospace;letter-spacing:.13em;margin-bottom:15px;direction:ltr;text-align:left;color:#566949}.level-diagram svg{width:100%;height:240px}.diagram-foot{display:flex;justify-content:space-between;border-top:1px solid #becbb0;padding-top:20px;margin-top:20px;font-size:.8125rem}.diagram-foot>b{font-weight:500}.draw-path{stroke-dasharray:560;stroke-dashoffset:560}.in-view .draw-path{animation:underline-in 2s ease forwards}.level-equation{direction:rtl;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;background-image:linear-gradient(#d4ddc870 1px,transparent 1px),linear-gradient(90deg,#d4ddc870 1px,transparent 1px);background-size:28px 28px;margin:28px;border-radius:14px;min-height:300px}.level-equation>span,.level-equation>small{font-size:.875rem}.level-equation>b{font:500 clamp(2rem,3.8vw,3.4rem)/1.3 Georgia,serif}.level-equation em{font-style:normal;background:var(--lime);padding-inline:7px}.equation-divider{width:100px;height:1px;background:#9daf8e}.fraction-bar{height:25px;width:65%;border:1px solid #869d6b;border-radius:3px;direction:ltr;background:#f6f8ef}.fraction-bar span{display:block;width:50%;height:100%;background:var(--lime);border-right:1px solid #869d6b}
.approach{background:var(--forest);color:var(--paper);height:255svh;position:relative}.approach-sticky{position:sticky;top:var(--header);min-height:calc(100svh - var(--header));display:flex;align-items:center;overflow:hidden}.approach-inner{display:grid;grid-template-columns:1fr 1fr;gap:90px;padding-block:68px;align-items:center}.light-eyebrow{color:#b8c7b3}.approach .eyebrow{margin-bottom:26px}.approach h2{font-size:clamp(3.6rem,5.7vw,5.4rem);line-height:1.05}.approach h2>span{color:var(--lime-ink)}.approach-subtitle{margin-top:19px;font-size:1.025rem;color:#c4d0bd}.story-steps{display:flex;flex-direction:column;gap:0;margin-top:31px}.story-step{display:flex;align-items:center;gap:18px;text-align:right;border-bottom:1px solid #ffffff16;padding:15px 0;transition:opacity .35s;color:#b7c4b0;min-height:80px}.story-step:last-child{border:0}.story-step>span:last-child{display:flex;flex-direction:column;gap:3px}.step-number{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;border:1px solid #789068;font-size:.75rem;font-weight:400;flex-shrink:0;direction:ltr;transition:background .35s,color .35s}.story-step b{font-size:1rem;font-weight:500}.story-step small{font-size:.8125rem;color:#aebfa4}.story-step.is-active{color:var(--lime)}.story-step.is-active .step-number{background:var(--lime);color:var(--ink);border-color:var(--lime)}.story-step:focus-visible{outline-color:var(--lime);outline-offset:2px}.math-story{background:#122219;border:1px solid #ffffff26;border-radius:24px;overflow:hidden;align-self:center;transform:rotate(-2deg);box-shadow:0 30px 60px #08160d33;min-width:0}.story-top,.story-footer{padding:23px 25px;display:flex;align-items:center;justify-content:space-between;gap:15px}.story-top{border-bottom:1px solid #ffffff15;color:#bdcbb4;font-size:.75rem}.story-page{direction:ltr;font-family:'Courier New',monospace;white-space:nowrap}.story-canvas{height:352px;position:relative;direction:ltr;background-image:radial-gradient(#91a67b38 1px,transparent 1px);background-size:22px 22px}.story-scene{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;opacity:0;transform:translateY(16px) scale(.98);transition:opacity .55s,transform .55s;pointer-events:none}.story-scene.is-active{opacity:1;transform:translateY(0) scale(1)}.central-equation{font:400 clamp(2rem,3.4vw,3.3rem)/1.3 Georgia,serif;position:relative;z-index:2;color:#e6eedc;padding:12px 7px;background:#12221996;white-space:nowrap;max-width:100%}.floating-symbol{position:absolute;font:italic 2.5rem/1 Georgia,serif;color:#b5cc9c66;animation:symbol-float 6s ease-in-out infinite}.symbol-one{top:43px;left:55px;transform:rotate(-20deg)}.symbol-two{right:50px;top:69px;animation-delay:-2s}.symbol-three{left:68px;bottom:74px;animation-delay:-4s}.symbol-four{bottom:57px;right:67px;animation-delay:-1s}.equation-note{position:absolute;bottom:26px;left:10px;right:10px;text-align:center;direction:rtl;font-size:.8125rem;color:#bfceb4}.story-footer{border-top:1px solid #ffffff15;font-size:.75rem;min-height:73px}.story-footer>span:first-child{max-width:75%;color:#bdcbb4}.story-track{width:65px;height:3px;background:#ffffff21;direction:ltr;flex-shrink:0}.story-track>i{display:block;background:var(--lime);width:33.333%;height:100%;transition:width .4s}.solve-line{font:400 clamp(1.6rem,2.7vw,2.55rem)/1.8 Georgia,serif;white-space:nowrap}.solve-line.bold{font-size:3.3rem}.accent{color:var(--lime)}.cross-out{position:relative;color:#9eaf90}.cross-out:after{content:'';position:absolute;height:2px;background:var(--lime);top:58%;left:-4px;right:-4px;transform:rotate(-30deg)}.operation-arrow{color:#7b9269;font-size:1.6rem;line-height:1.3}.solution-ring{width:170px;height:170px;border:2px solid var(--lime);border-radius:50%;display:flex;align-items:center;justify-content:center;position:relative;box-shadow:0 0 60px #c3f35a08}.solution-ring:after{content:'';position:absolute;inset:-13px;border:1px dashed #c3f35a38;border-radius:50%}.solution-ring>span{font:400 3.4rem/1 Georgia,serif}.solution-ring b{font-weight:400;color:var(--lime)}.solution-check{font:400 1.15rem/1.4 Georgia,serif;display:flex;gap:12px;align-items:center;margin-top:32px}.solution-check b{font-weight:400;color:var(--lime)}
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