:root{--background:#100f18;--foreground:#f4f1ed;--primary:#c4f18b;--primary-foreground:#100f18;--muted:#25222f;--muted-foreground:#a6a0ae;--border:#ffffff24;--ring:#c4f18b;--radius:.5rem;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--background);color:var(--foreground);font-family:Arial,Helvetica,sans-serif;-webkit-font-smoothing:antialiased}::selection{background:#c4f18b;color:#100f18}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;cursor:pointer}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible{outline:2px solid #c4f18b;outline-offset:6px}button{border:0}main{position:relative;overflow:clip}.field{position:fixed;inset:0;z-index:0;pointer-events:none;background:radial-gradient(ellipse at 74% 48%,#231c32,#100f18 62%)}.field canvas{width:100%;height:100%;display:block}.field-fallback{position:absolute;right:12%;top:24%;width:35vw;aspect-ratio:1;border:1px solid #c4f18b66;border-radius:50%;box-shadow:0 0 100px #a389b92b,inset 0 0 60px #cc609b24}.field.is-ready .field-fallback{display:none}.site-header{position:absolute;top:0;left:0;width:100%;height:106px;display:flex;align-items:center;justify-content:space-between;padding:0 5%;z-index:3}.brand{display:flex;gap:10px;align-items:center;font-size:28px;font-weight:700;letter-spacing:-1.4px}.brand img{width:34px;height:39px;filter:none}.nav-explore{font-size:14px;color:#c7c1ce;display:flex;gap:24px;margin-left:80px}.nav-join{font-size:14px;border:1px solid #ffffff40;padding:13px 19px;border-radius:30px;display:flex;gap:22px;align-items:center;transition:background .2s}.nav-join:hover{background:#ffffff14}.hero{height:100svh;min-height:740px;position:relative;padding:170px 7% 0}.hero-overline{font-size:12px;letter-spacing:2.7px;display:flex;align-items:center;gap:10px;color:#d3c9df}.tiny-star{color:#c4f18b;font-size:24px}.hero-copy{position:relative;z-index:1;pointer-events:none}.hero-copy a{pointer-events:auto}h1{font-size:clamp(64px,6.85vw,108px);font-weight:400;line-height:1.035;letter-spacing:-5.5px;margin:33px 0 27px;max-width:800px}h1 em,h2 em{font-family:Georgia,Times New Roman,serif;font-weight:400;color:#c4f18b;letter-spacing:-.065em}h1 em{white-space:nowrap}.hero-copy>p{font-size:17px;line-height:1.65;color:#aba4b6;margin:0}.explore-link{display:inline-flex;align-items:center;gap:28px;font-size:14px;border-bottom:1px solid #8f889b;padding:0 0 10px;margin-top:26px}.explore-link:hover{color:#c4f18b}.field-caption{position:absolute;right:9%;bottom:17%;font-size:13px;color:#d6cedd;display:flex;gap:15px;align-items:flex-start;pointer-events:none}.field-caption small{display:block;color:#9991a6;font-size:12px;margin-top:9px}.caption-line{height:1px;width:32px;background:#bca4d7;margin-top:6px}.hero-bottom{position:absolute;bottom:40px;left:7%;right:7%;border-top:1px solid #ffffff20;padding-top:24px;display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:11px;letter-spacing:1.3px;line-height:1.6;color:#aaa2b6}.hero-bottom a{display:flex;gap:20px;align-items:center}.availability{font-size:16px;letter-spacing:0;color:#fff}.availability span{font-size:12px;color:#9991a6;margin-left:12px}.intro{position:relative;padding:145px 7% 100px;background:linear-gradient(#100f1800,#100f18e8 20%,#100f18f5 80%,#100f1800);z-index:1}.eyebrow{font-size:12px;letter-spacing:2px;color:#aca2b8}h2{font-size:clamp(44px,5vw,76px);font-weight:400;letter-spacing:-3px;line-height:1.1;margin:30px 0}.intro>p{color:#b4aabc;font-size:17px;line-height:1.7}.chapter-index{display:grid;grid-template-columns:repeat(5,1fr);margin-top:75px;border-top:1px solid #ffffff24}.chapter-index a{padding:25px 15px 25px 0;display:flex;gap:12px;font-size:14px;align-items:center}.chapter-index a svg{margin-left:auto}.chapter-index a:hover{color:#c4f18b}.chapter-index a>span{font-size:12px}.chapter{position:relative;min-height:940px;height:105svh;padding:130px 7%;display:flex;align-items:center;scroll-margin-top:0}.chapter-copy{width:46%;position:relative;z-index:1}.chapter-label{font-size:11px;letter-spacing:1.25px;display:flex;gap:27px;color:var(--chapter);align-items:center}.chapter h2{font-size:clamp(44px,4.8vw,70px);line-height:1.09}.chapter h2 em{color:var(--chapter)}.chapter-copy>p{max-width:380px;font-size:17px;line-height:1.7;color:#b4aabc}.example{margin-top:35px;border-top:1px solid #ffffff30;padding:23px 0 0;max-width:385px}.example-label{font-size:11px;letter-spacing:1.8px;color:#958b9f}.example button{background:transparent}.math-question{font-size:40px;letter-spacing:-2px;margin:18px 0}.math-question>span{font-size:18px;color:#948b9f;margin-left:24px;letter-spacing:-.5px}.math-solution{display:flex;flex-direction:column;gap:10px;border-left:2px solid var(--chapter);padding:3px 0 3px 20px;margin-bottom:22px}.math-solution span{font-size:14px;color:#b4aabc}.math-solution strong{font-size:25px;font-weight:400}.example>button{font-size:14px;color:var(--chapter);padding:10px 0;display:flex;align-items:center;gap:28px}.word-parts{display:flex;margin:24px 0 12px;gap:3px}.word-parts button{font-size:clamp(26px,3vw,43px);padding:6px 8px;border-bottom:2px solid #ffffff20;letter-spacing:-2px;color:#c0b6cc}.word-parts button[aria-pressed=true]{color:var(--chapter);border-color:var(--chapter);background:#d0a5ff12}.example p{font-size:15px;color:#bfb4cc;line-height:1.65;min-height:28px}.example-note{font-size:13px;color:#92899d;display:block}.example h3{font-family:Georgia,serif;font-size:30px;font-weight:400;line-height:1.2;margin:22px 0;letter-spacing:-1px}.fraction-row{display:flex;gap:6px;margin:25px 0;align-items:center}.fraction-row button{width:54px;height:60px;border:1px solid #ffa46b66;border-radius:2px;transition:background .2s}.fraction-row button.shaded{background:#ffa46b}.fraction-row>span{margin-left:16px;font-family:Georgia,serif;font-size:25px}.example>.print-link{margin-top:15px}.leaf-topics{display:flex;gap:8px}.leaf-topics button{font-size:12px;padding:8px 12px;border:1px solid #ffffff30;border-radius:20px}.leaf-topics button[aria-pressed=true]{background:#f994b923;color:#f994b9;border-color:#f994b977}.gallery-example p{min-height:74px}.chapter-art-note{position:absolute;left:63%;bottom:13%;display:flex;flex-direction:column;text-align:center;pointer-events:none;color:var(--chapter)}.chapter-art-note>span{font-size:12px;letter-spacing:5px}.chapter-art-note small{font-size:12px;color:#9f94ad;margin-top:14px}.scene-dots{position:fixed;right:27px;top:45%;display:flex;flex-direction:column;gap:15px;z-index:5}.scene-dots a{height:6px;width:6px;border-radius:50%;background:#ffffff30;position:relative;transition:.3s}.scene-dots a:before{content:"";position:absolute;inset:-7px}.scene-dots a.selected{background:var(--dot,#c4f18b);box-shadow:0 0 0 4px #ffffff0b}.motion-controls{position:fixed;right:25px;bottom:24px;display:flex;gap:2px;background:#1b1825c9;border:1px solid #ffffff1c;border-radius:30px;padding:4px;z-index:5;backdrop-filter:blur(10px)}.motion-controls button{display:grid;place-items:center;background:none;width:34px;height:34px;color:#b6abca;border-radius:50%}.motion-controls button:hover{background:#ffffff15;color:#fff}.site-footer{position:relative;padding:150px 7% 35px;z-index:1;background:linear-gradient(0deg,#100f18 10%,#100f18a0 90%,transparent)}.site-footer h2{font-size:clamp(52px,7vw,96px)}.footer-join{display:inline-flex;align-items:center;gap:45px;padding:17px 25px;border-radius:40px;background:#c4f18b;color:#15151a;margin:10px 0 130px;font-size:17px}.footer-join:hover{background:#dcffb0}.footer-base{border-top:1px solid #ffffff25;padding-top:30px;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:#9e92ac}.footer-base>a:last-child{margin-right:80px}@media(min-width:1600px){.hero{padding-top:20vh}.chapter-copy{max-width:680px}.hero-bottom{bottom:50px}}@media(max-width:900px){.hero{padding:150px 6% 0;min-height:730px}h1{font-size:70px;letter-spacing:-4px}.nav-explore{display:none}.chapter-index{grid-template-columns:repeat(3,1fr)}.chapter-copy{width:54%}.chapter-label{font-size:10px;gap:16px}.chapter{padding-left:6%;padding-right:6%}.chapter-art-note{left:66%}.chapter-art-note small{max-width:150px}.field-caption{right:9%;font-size:12px;bottom:20%}.hero-bottom>span:first-child{max-width:230px}.scene-dots{right:16px}}@media(max-width:600px){html{scroll-padding-top:30px}.site-header{height:88px;padding:0 6%}.brand{font-size:25px}.brand img{width:29px;height:34px}.nav-join{font-size:12px;padding:11px 14px;gap:13px}.hero{height:930px;min-height:100svh;padding-top:142px}.hero-overline{font-size:10px;letter-spacing:1.8px}h1{font-size:clamp(48px,12.4vw,70px);letter-spacing:-3px;margin:28px 0 22px}.hero-copy>p{font-size:15px}.explore-link{font-size:13px;margin-top:20px}.field-caption{left:12%;right:auto;bottom:124px;font-size:12px}.hero-bottom{bottom:28px;left:6%;right:6%;font-size:9px;padding-top:18px}.hero-bottom>a{font-size:9px;gap:8px}.hero-bottom>span:first-child{display:none}.availability{font-size:14px}.availability span{font-size:11px;margin-left:8px}.intro{padding:90px 7% 60px}.eyebrow{font-size:10px;letter-spacing:1.5px}h2{font-size:43px;letter-spacing:-2px}.intro>p{font-size:15px}.desktop-break{display:none}.chapter-index{grid-template-columns:1fr;margin-top:40px}.chapter-index a{border-bottom:1px solid #ffffff16;padding:17px 4px}.chapter-index a>span{margin-right:12px}.chapter{height:auto;min-height:1080px;padding:75px 7% 445px;align-items:flex-start}.chapter-copy{width:100%}.chapter-label{font-size:9px;letter-spacing:1px;gap:18px}.chapter h2{font-size:44px;margin:27px 0 20px}.chapter-copy>p{font-size:15px;max-width:310px}.example{margin-top:25px;max-width:100%}.example h3{font-size:29px}.math-question{font-size:34px}.word-parts button{font-size:38px}.chapter-art-note{left:0;right:0;bottom:65px}.chapter-art-note small{max-width:none}.scene-dots{display:none}.motion-controls{right:14px;bottom:14px}.site-footer{padding:90px 7%}.site-footer h2{font-size:48px}.footer-join{margin-bottom:90px;font-size:15px}.footer-base{flex-wrap:wrap;gap:25px;font-size:12px}.footer-base>a:last-child{margin-right:0}.footer-base .brand{flex-basis:100%}.field{background:radial-gradient(ellipse at 70% 65%,#251e32,#100f18 75%)}.field-fallback{width:65vw;top:56%;right:18%}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition:none!important}}@media print{body{background:#fff;color:#000}.site-header,.field,.hero,.intro,.chapter:not(.chapter-paper),.site-footer,.scene-dots,.motion-controls,.chapter-art-note,.chapter-label,.print-link{display:none!important}.chapter-paper{min-height:0;height:auto;padding:20mm;display:block}.chapter-copy{width:100%}.chapter h2,.chapter h2 em,.chapter-copy>p,.example-label,.example-note{color:#000}.example{border-color:#000;max-width:100%}.fraction-row button{border-color:#000}.fraction-row button.shaded{background:#888!important;print-color-adjust:exact}.chapter-paper h2{font-size:32px}.chapter-paper h2 em{font-family:Georgia,serif}}.field{z-index:2;background:none;mix-blend-mode:screen}body{background:#100f18}.hero-copy,.hero-overline,.site-header,.chapter-copy,.intro>h2,.intro>p,.intro>.eyebrow,.chapter-index,.site-footer>h2,.site-footer>.eyebrow,.footer-join,.footer-base{position:relative;z-index:3}.site-header{position:absolute}.hero-copy h1,.chapter h2,.intro h2,.site-footer h2{text-shadow:0 2px 24px #100f18,0 0 4px #100f18}.hero-copy>p,.chapter-copy>p,.example,.intro>p{background:linear-gradient(90deg,#100f18f5,#100f18b0 78%,#100f1800);width:fit-content}.hero-copy>p{padding-right:35px}.chapter-copy>p{padding-right:24px}.example{width:100%;padding-right:18px}.intro,.site-footer{z-index:auto;background:none}.hero-bottom,.chapter-art-note,.field-caption{z-index:3}.chapter-art-note{background:#100f18ba;padding:12px 18px;backdrop-filter:blur(5px)}.field-caption{background:#100f18d9;padding:12px 16px;right:6%;bottom:18%}.intro h2,.intro>p{width:fit-content}@media(max-width:600px){.field-caption{bottom:105px;left:7%;right:auto}.hero-copy h1{max-width:100%}.chapter-art-note{left:12%;right:12%}.intro>h2{max-width:100%}.example{background:linear-gradient(90deg,#100f18f5,#100f18e8 85%,#100f1800)}}.hero-copy>p,.chapter-copy>p,.example,.intro>p{background:none}.hero-copy>p,.chapter-copy>p,.example,.intro>p{text-shadow:0 1px 5px #100f18,0 0 14px #100f18,0 0 22px #100f18}.chapter-art-note,.field-caption{background:none;backdrop-filter:none;text-shadow:0 1px 10px #100f18}.ion-world{--ion-ink:#dfe6e2;--ion-muted:#a8adb9;--ion-accent:#b7ede1;background:#080a12;color:var(--ion-ink);isolation:isolate}.ion-world .ion-field{z-index:-1;mix-blend-mode:normal;background:#080a12;contain:strict}.ion-world .ion-field:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#080a123b 0%,transparent 52%);pointer-events:none}.ion-world .site-header{height:104px;padding:0 6%;border-bottom:1px solid #c9e1e312}.ion-world .brand{font-weight:500;letter-spacing:-1.6px;font-size:29px}.ion-world .nav-explore{color:#aeb7c1;font-size:12px;letter-spacing:.035em;margin-left:0}.ion-world .nav-explore span{color:var(--ion-accent)}.ion-world .nav-join{border-color:#d4f3f13b;border-radius:3px;padding:12px 17px;font-size:12px}.ion-world .nav-join:hover{background:#b7ede112;border-color:#b7ede180}.ion-world .hero{min-height:790px;height:100svh;padding:clamp(160px,19vh,215px) 7% 0}.ion-world .hero-overline{font-size:10px;letter-spacing:3.3px;color:#a4bcbf;gap:14px}.ion-world .tiny-star{width:7px;height:7px;border:1px solid #b7ede1;transform:rotate(45deg);font-size:0;box-shadow:0 0 15px #9ee8da4d}.ion-world h1{font-size:clamp(68px,7.35vw,118px);line-height:1;font-weight:400;letter-spacing:-.063em;margin:31px 0 29px;max-width:760px}.ion-world h1 em,.ion-world .intro h2 em,.ion-world .site-footer h2 em{color:#c4eae1}.ion-world .hero-copy h1,.ion-world .chapter h2,.ion-world .intro h2,.ion-world .site-footer h2{text-shadow:0 2px 28px #080a1280}.ion-world .hero-copy>p{font-size:15px;line-height:1.8;color:var(--ion-muted)}.ion-world .explore-link{font-size:12px;gap:38px;margin-top:30px;border-bottom-color:#abc4c366;padding-bottom:13px;color:#dbece5}.ion-world .explore-link:hover{color:#fff;border-color:#dbece5}.ion-world .field-caption{bottom:19%;right:12%;padding:0;font-size:11px;color:#c2ccd0;letter-spacing:.015em}.ion-world .field-caption small{color:#7f929e;font-size:10px;letter-spacing:.06em}.ion-world .caption-line{width:20px;background:#bfd9d1}.ion-world .hero-bottom{bottom:35px;border-top-color:#d7eff019;font-size:9px;letter-spacing:1.6px;color:#929ea8;padding-top:22px}.ion-world .hero-bottom a{color:#bdcbc9;font-size:9px}.ion-world .availability{font-size:14px}.ion-world .availability span{font-size:11px;color:#929ea8}.ion-world .intro{padding:155px 7% 130px}.ion-world .eyebrow{color:#91a5ac;font-size:10px;letter-spacing:2.2px}.ion-world .intro h2{font-size:clamp(46px,5.8vw,86px);letter-spacing:-.055em;margin-top:37px;line-height:1.08}.ion-world .intro>p{font-size:15px;color:var(--ion-muted)}.ion-world .chapter-index{margin-top:70px;border-color:#d8e4e326;gap:22px}.ion-world .chapter-index a{font-size:12px;padding:25px 0;gap:10px;position:relative}.ion-world .chapter-index a:after{content:"";position:absolute;bottom:0;left:0;height:1px;background:#b7ede1;width:0;transition:width .35s}.ion-world .chapter-index a:hover:after{width:100%}.ion-world .chapter{height:110svh;min-height:870px;padding:120px 7%}.ion-world .chapter-copy{width:45%}.ion-world .chapter h2{font-size:clamp(43px,4.6vw,70px);letter-spacing:-.055em}.ion-world .chapter-label{font-size:9px;letter-spacing:1.35px;gap:24px;line-height:1.6}.ion-world .chapter-label>span:first-child{min-width:42px;font-variant-numeric:tabular-nums}.ion-world .chapter-copy>p{font-size:15px;color:var(--ion-muted);max-width:360px}.ion-world .example{max-width:350px;margin-top:32px;border-top-color:#d8e4e326;padding-top:25px}.ion-world .example-label{font-size:9px;letter-spacing:1.8px;color:#87979f}.ion-world .example p{font-size:14px;color:#b4bdc6}.ion-world .example-note{font-size:12px;color:#87979f}.ion-world .example button{font-size:12px}.ion-world .math-question{font-size:38px;margin:20px 0}.ion-world .math-solution{border-left-width:1px}.ion-world .word-parts button{font-size:38px;padding:7px}.ion-world .fraction-row button{height:54px;border-radius:0}.ion-world .leaf-topics button{border-radius:2px;padding:8px 11px;font-size:11px}.ion-world .chapter-art-note{left:58%;right:9%;bottom:14%;padding:0;text-shadow:0 1px 16px #080a12}.ion-world .chapter-art-note>span{font-size:9px;letter-spacing:4px}.ion-world .chapter-art-note small{font-size:11px;color:#90a0a9;margin-top:12px}.ion-world .scene-dots{right:26px;gap:19px}.ion-world .scene-dots a{width:4px;height:4px;border-radius:0;transform:rotate(45deg);background:#b3cbd044}.ion-world .scene-dots a.selected{background:var(--dot,#b7ede1);box-shadow:0 0 12px var(--dot,#b7ede1)}.ion-world .motion-controls{background:#0c111bba;border-radius:3px;border-color:#cbe9e329;padding:3px;backdrop-filter:blur(12px)}.ion-world .motion-controls button{color:#a4baba;width:30px;height:30px;border-radius:1px}.ion-world .site-footer{padding-top:180px}.ion-world .site-footer h2{letter-spacing:-.055em;font-size:clamp(56px,7vw,106px)}.ion-world .footer-join{border-radius:3px;background:#c4eae1;padding:17px 24px;font-size:14px;margin-bottom:135px}.ion-world .footer-join:hover{background:#e1fff6}.ion-world .footer-base{font-size:11px;border-color:#d8e4e326;color:#919da8}.ion-world button:focus-visible,.ion-world a:focus-visible{outline-color:#b7ede1}@media(min-width:1800px){.ion-world .hero{padding-top:22vh}.ion-world h1{font-size:130px}}@media(max-width:1000px){.ion-world .hero{padding-top:180px}.ion-world h1{font-size:76px}.ion-world .chapter-copy{width:51%}.ion-world .chapter-index{gap:10px}.ion-world .chapter-index a{font-size:11px}.ion-world .field-caption{right:8%;bottom:18%}.ion-world .chapter-label{gap:14px;font-size:8px}}@media(max-width:700px){.ion-world .ion-field:after{background:linear-gradient(180deg,#080a121f,transparent 65%)}.ion-world .site-header{height:87px}.ion-world .brand{font-size:25px}.ion-world .nav-join{font-size:11px;padding:10px 12px}.ion-world .hero{height:1000px;min-height:100svh;padding:147px 7% 0}.ion-world .hero-overline{font-size:9px;letter-spacing:2.2px}.ion-world h1{font-size:clamp(49px,12vw,78px);letter-spacing:-.055em;margin-top:27px;line-height:1.035}.ion-world .hero-copy>p{font-size:14px}.ion-world .explore-link{margin-top:23px}.ion-world .field-caption{left:0;right:0;bottom:113px;justify-content:center;font-size:11px}.ion-world .field-caption .caption-line{display:none}.ion-world .field-caption>span{text-align:center}.ion-world .hero-bottom{left:7%;right:7%;bottom:28px;padding-top:20px}.ion-world .hero-bottom>span:first-child{display:none}.ion-world .hero-bottom a{font-size:8px;letter-spacing:1px}.ion-world .intro{padding:100px 7% 80px;background:linear-gradient(#080a1200,#080a12c7 24% 80%,#080a1200)}.ion-world .intro h2{font-size:46px}.ion-world .intro>p{font-size:14px}.ion-world .chapter-index{grid-template-columns:1fr;margin-top:40px;gap:0}.ion-world .chapter-index a{font-size:13px;padding:19px 0;border-bottom-color:#d8e4e319}.ion-world .chapter{height:auto;min-height:1140px;padding:85px 7% 480px;align-items:flex-start}.ion-world .chapter-copy{width:100%;max-width:480px}.ion-world .chapter-label{font-size:9px;gap:19px}.ion-world .chapter h2{font-size:44px}.ion-world .chapter-copy>p{font-size:14px;max-width:340px}.ion-world .example{max-width:355px}.ion-world .chapter-art-note{left:7%;right:7%;bottom:80px}.ion-world .scene-dots{display:none}.ion-world .site-footer{padding:110px 7% 100px;background:linear-gradient(0deg,#080a12,#080a12a0,transparent)}.ion-world .site-footer h2{font-size:52px}.ion-world .footer-join{margin-bottom:95px}.ion-world .footer-base .brand{flex-basis:100%}}@media(max-width:380px){.ion-world .chapter h2{font-size:40px}.ion-world .chapter-label{font-size:8px;gap:12px}.ion-world .word-parts button{font-size:32px}.ion-world .intro h2{font-size:41px}}@media(max-width:700px){.ion-story .intro{padding-bottom:475px;background:linear-gradient(#080a1200,#080a1299 15%,#080a1270 54%,#080a1200 72%)}.ion-story .site-footer .footer-join{margin-bottom:450px}.ion-story .site-footer{background:linear-gradient(0deg,#080a12de,transparent 40%)}}@media print{.ion-world{background:#fff;color:#000}.ion-world .chapter-paper{height:auto;min-height:0;padding:20mm}.ion-world .chapter-copy{width:100%}.ion-world .chapter h2,.ion-world .chapter h2 em,.ion-world .chapter-copy>p,.ion-world .example-label,.ion-world .example-note{color:#000;text-shadow:none}}body{background:#080a12}.website-review{min-height:100svh}.website-review .hero-overline{text-transform:uppercase}.website-review .hero-bottom>a{text-transform:uppercase;min-height:44px}.website-review .hero-access{display:flex;align-items:center;gap:55px;padding-right:75px}.website-review .waitlist-access{display:flex;gap:12px;align-items:center;font-size:14px;letter-spacing:0;color:#dfe6e2}.website-review .waitlist-access>a{display:flex;align-items:center;gap:8px;min-height:44px;font-size:14px}.website-review .waitlist-access>span{font-size:11px;color:#a8adb9}.website-review .availability span{color:#a8adb9}.website-review .intro>p{max-width:430px;line-height:1.8}.website-review .chapter-label{font-size:11px;letter-spacing:1.4px;text-transform:uppercase}.website-review .source-example{padding-bottom:12px}.website-review .source-example>small{display:block;font-size:10px;letter-spacing:1.8px;color:#a8adb9;margin-bottom:22px}.website-review .source-example>strong{display:block;font-weight:400;font-size:38px;line-height:1.2;letter-spacing:-1.3px}.website-review .source-example .phone-action{display:flex;align-items:center;gap:28px;margin-top:26px;color:var(--chapter);font-size:13px;line-height:1.5}.website-review .phone-action b{font-weight:400}.website-review .source-math .hand-line{margin:23px 0 8px;font-size:14px}.website-review .source-math .math-route{font-size:25px;line-height:.95;border-left:1px solid var(--chapter);padding-left:22px;color:#dfe6e2;margin:16px 0 0}.website-review .source-words>strong{margin-bottom:18px;letter-spacing:-1.5px}.website-review .source-words>strong span{color:var(--chapter)}.website-review .word-parts{gap:10px;margin:18px 0 22px}.website-review .word-parts i{font-style:normal;border-bottom:1px solid #d0a5ff70;color:#d0a5ff;font-size:17px;padding:8px 12px}.website-review .source-words>p{max-width:260px}.website-review .source-paper>strong{font-family:Georgia,serif;font-size:35px;letter-spacing:-1px;line-height:1.1}.website-review .worksheet-lines{display:flex;gap:6px;margin-top:25px}.website-review .worksheet-lines i{height:48px;width:54px;border:1px solid #ffa46b77}.website-review .worksheet-lines i:nth-child(-n+2){background:#ffa46b55}.website-review .pen-drawing{display:flex;align-items:center;height:60px;margin:28px 0;position:relative;max-width:310px}.website-review .pen-drawing i{height:23px;width:176px;border:1px solid #83d9e8;border-radius:4px 2px 2px 4px;background:#83d9e810}.website-review .pen-drawing b{height:17px;width:44px;margin-left:14px;background:repeating-linear-gradient(110deg,transparent 0 5px,#83d9e8 5px 6px,transparent 6px 9px)}.website-review .pen-drawing em{height:8px;width:54px;border:1px solid #83d9e8;margin-left:12px;position:relative}.website-review .pen-drawing em:after{content:"";position:absolute;left:100%;top:-1px;border-left:9px solid #83d9e8;border-top:4px solid transparent;border-bottom:4px solid transparent}.website-review .source-gallery>strong{font-family:Georgia,serif;font-size:32px;line-height:1.25}.website-review .gallery-boards{display:flex;gap:8px;margin-top:28px}.website-review .gallery-boards i{font-style:normal;font-size:12px;padding:9px 10px;border:1px solid #f994b940;color:#f994b9;border-radius:2px}.website-review .footer-access{display:flex;align-items:center;gap:22px;margin:15px 0 140px}.website-review .footer-access .footer-join{margin:0}.website-review .footer-access>span{font-size:12px;color:#a8adb9}.website-review .footer-base>a:last-child{display:flex;align-items:center;gap:12px;min-height:44px}.website-review .motion-controls button{width:40px;height:40px}.website-review .motion-controls button:disabled{opacity:.35;cursor:default}.website-review .scene-dots a:before{inset:-10px}@media(max-width:700px){.website-review .hero{height:1000px}.website-review .hero-overline{font-size:8px;letter-spacing:1.6px}.website-review .hero-bottom{align-items:flex-end;bottom:100px}.website-review .hero-access{align-items:flex-start;flex-direction:column;gap:12px;padding-right:0}.website-review .waitlist-access{align-items:flex-start;flex-direction:column;gap:0}.website-review .waitlist-access>a{min-height:32px}.website-review .hero-bottom>a{font-size:9px}.website-review .hero-access .availability{font-size:14px}.website-review .intro h2{font-size:clamp(39px,10.5vw,52px)}.website-review .intro>p{max-width:340px}.website-review .chapter-label{font-size:10px}.website-review .source-example>strong{font-size:35px}.website-review .source-gallery>strong{font-size:30px}.website-review .footer-access{margin-bottom:470px;gap:18px}.website-review .footer-base{gap:22px;padding-top:24px}.website-review .footer-base>span{width:100%}.website-review .footer-base>a:last-child{margin-right:0}.website-review .site-footer h2{font-size:clamp(42px,11vw,65px)}}@media(max-width:380px){.website-review .hero-access{gap:14px}.website-review .intro h2,.website-review .chapter h2{font-size:39px}}@media print{.website-review .source-paper,.website-review .source-paper .phone-action{color:#000}.website-review .footer-access{display:none}}html:not([data-website-ready]) .motion-controls{display:none}html:has(.ion-color),body:has(.ion-color){background:#dff3ea;color-scheme:light}.ion-world.ion-color{--ion-ink:#301239;--ion-muted:#5a5266;--ion-accent:#b31360;background:#dff3ea;color:var(--ion-ink);color-scheme:light}.ion-color ::selection{background:#ffce40;color:#301239}.ion-color .ion-field{background:#dff3ea}.ion-color .ion-field:after{background:linear-gradient(90deg,#dff3ea40,transparent 52%)}.ion-color .site-header{border-color:#3012391a}.ion-color .brand{font-weight:600}.ion-color .nav-explore,.ion-color .hero-overline,.ion-color .eyebrow{color:#5d4d68}.ion-color .nav-join{background:#ffd238;color:#301239;border-color:#d9aa14}.ion-color .nav-join:hover{background:#ffe377;border-color:#301239}.ion-color .tiny-star{border-color:#c41a6b;background:#f51d83;box-shadow:none}.ion-color h1 em,.ion-color .intro h2 em,.ion-color .site-footer h2 em{color:#b31360}.ion-color .hero-copy h1,.ion-color .chapter h2,.ion-color .intro h2,.ion-color .site-footer h2,.ion-color .hero-copy>p,.ion-color .chapter-copy>p,.ion-color .example,.ion-color .intro>p,.ion-color .chapter-art-note,.ion-color .field-caption{text-shadow:none}.ion-color .explore-link{color:#301239;border-color:#30123966}.ion-color .explore-link:hover{color:#b31360;border-color:#b31360}.ion-color .field-caption,.ion-color .hero-bottom,.ion-color .hero-bottom a,.ion-color .availability,.ion-color .field-caption small,.ion-color .availability span,.ion-color .footer-base{color:#5a5266}.ion-color .caption-line{background:#b31360}.ion-color .hero-bottom,.ion-color .chapter-index,.ion-color .example,.ion-color .footer-base{border-color:#3012392b}.ion-color .chapter-index a:hover{color:#b31360}.ion-color .chapter-index a:after{background:#b31360;height:2px}.ion-color .example-label,.ion-color .example-note,.ion-color .math-question>span,.ion-color .math-solution span,.ion-color .example p,.ion-color .chapter-art-note small{color:#5a5266}.ion-color .word-parts button{color:#63536c;border-color:#30123928}.ion-color .word-parts button[aria-pressed=true]{color:var(--chapter);border-color:var(--chapter);background:#7932dc12}.ion-color .fraction-row button{border-color:#a93d0480}.ion-color .fraction-row button.shaded{background:#ff6508}.ion-color .leaf-topics button{border-color:#30123940}.ion-color .leaf-topics button[aria-pressed=true]{background:#f51d831c;color:#b31360;border-color:#b31360}.ion-color .scene-dots a{background:#30123933}.ion-color .scene-dots a.selected{background:var(--dot,#b31360);box-shadow:0 0 0 4px #3012390b}.ion-color .motion-controls{background:#e9f6eeed;border-color:#30123933}.ion-color .motion-controls button{color:#51405d}.ion-color .motion-controls button:hover{background:#30123912;color:#301239}.ion-color .footer-join{background:#ffd238;color:#301239}.ion-color .footer-join:hover{background:#ffe377}.ion-color button:focus-visible,.ion-color a:focus-visible{outline-color:#075ba9}@media(max-width:700px){.ion-color .ion-field:after{background:linear-gradient(180deg,#dff3ea33,transparent 65%)}.ion-color .intro{background:linear-gradient(#dff3ea00,#dff3eacc 15%,#dff3ea99 54%,#dff3ea00 72%)}.ion-color .chapter-index a{border-bottom-color:#30123926}.ion-color .site-footer{background:linear-gradient(0deg,#dff3eaed,transparent 40%)}}@media print{.ion-world.ion-color{background:#fff;color:#000}.ion-color .chapter h2,.ion-color .chapter h2 em,.ion-color .chapter-copy>p,.ion-color .example-label,.ion-color .example-note{color:#000}}html:has(.ion-inside),body:has(.ion-inside){background:#fff27a}.ion-world.ion-inside{background:var(--inside-paper,#fff27a);padding-bottom:70px}.ion-inside .inside-field{background:var(--inside-paper,#fff27a)}.ion-inside .ion-field:after{background:none}.ion-inside .hero-copy h1,.ion-inside .intro h2,.ion-inside .site-footer h2{font-weight:400}.ion-inside .hero{min-height:900px}.ion-inside .field-caption{bottom:28%}.ion-inside .nav-join,.ion-inside .footer-join{background:var(--ion-ink);color:var(--inside-paper);border-color:var(--ion-ink)}.ion-inside .nav-join:hover,.ion-inside .footer-join:hover{background:var(--ion-accent);color:var(--inside-paper);border-color:var(--ion-accent)}.ion-inside .motion-controls{background:var(--inside-paper);border-color:color-mix(in srgb,var(--ion-ink) 25%,transparent)}.ion-inside .motion-controls button{color:var(--ion-ink)}.ion-inside .hero-bottom{bottom:88px;border-top-color:color-mix(in srgb,var(--ion-ink) 20%,transparent)}.ion-inside .intro,.ion-inside .site-footer{background:none}.ion-inside .chapter-art-note,.ion-inside .explore-link{color:var(--ion-ink)}.ion-inside .nav-explore,.ion-inside .hero-overline,.ion-inside .eyebrow,.ion-inside .field-caption,.ion-inside .field-caption small,.ion-inside .hero-bottom,.ion-inside .hero-bottom a,.ion-inside .availability,.ion-inside .availability span,.ion-inside .footer-base,.ion-inside .example-label,.ion-inside .example-note,.ion-inside .math-question>span,.ion-inside .math-solution span,.ion-inside .example p,.ion-inside .chapter-art-note small,.ion-inside .word-parts button{color:var(--ion-muted)}.ion-inside h1 em,.ion-inside .intro h2 em,.ion-inside .site-footer h2 em,.ion-inside .chapter-index a:hover,.ion-inside .explore-link:hover{color:var(--ion-accent)}.ion-inside .caption-line,.ion-inside .chapter-index a:after{background:var(--ion-accent)}.ion-inside .tiny-star{background:var(--inside-spark);border-color:var(--ion-accent)}.ion-inside .fraction-row button{border-color:var(--ion-accent)}.ion-inside .fraction-row button.shaded{background:var(--ion-accent)}.ion-inside .word-parts button[aria-pressed=true],.ion-inside .leaf-topics button[aria-pressed=true]{color:var(--ion-accent);border-color:var(--ion-accent);background:color-mix(in srgb,var(--ion-accent) 10%,transparent)}.ion-inside button:focus-visible,.ion-inside a:focus-visible{outline:2px solid var(--ion-ink);outline-offset:4px}.ion-inside .field-caption,.ion-inside .field-caption small,.ion-inside .chapter-art-note,.ion-inside .chapter-art-note small{color:var(--ion-ink);text-shadow:none}.ion-inside .availability,.ion-inside .availability span,.ion-inside .footer-base>a:last-child{color:var(--ion-ink)}.ion-inside .palette-picker{position:fixed;z-index:8;left:50%;bottom:max(18px,env(safe-area-inset-bottom));transform:translate(-50%);width:min(620px,calc(100% - 180px));padding:12px 14px 10px;color:var(--ion-ink);background:color-mix(in srgb,var(--inside-paper) 92%,white);border:1px solid color-mix(in srgb,var(--ion-ink) 20%,transparent);box-shadow:0 5px 28px #23163514;border-radius:8px}.palette-heading{display:flex;justify-content:space-between;gap:12px;padding:0 4px 9px;font-size:11px;line-height:1.3;letter-spacing:.04em}.palette-heading>span:first-child{color:var(--ion-muted)}.palette-heading .palette-auto{background:transparent;padding:3px 0;color:var(--ion-muted);font-size:11px;line-height:1.3;min-height:24px}.palette-heading .palette-auto[aria-pressed=true]{color:var(--ion-accent)}.ion-inside .palette-picker,.ion-inside .motion-controls{transition:background-color .35s,color .35s}.palette-heading small{font-size:9px;font-variant-numeric:tabular-nums;margin-left:7px;color:var(--ion-muted)}.palette-options{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}.palette-options button{min-width:0;min-height:52px;padding:5px 5px 4px;text-align:left;border-radius:3px;background:transparent;border:1px solid transparent;color:var(--ion-ink)}.palette-options button:hover{background:color-mix(in srgb,var(--ion-ink) 6%,transparent)}.palette-options button[aria-pressed=true]{background:color-mix(in srgb,white 35%,transparent);border-color:var(--ion-ink)}.palette-sample{display:flex;height:19px;overflow:hidden;border-radius:1px}.palette-sample i{display:block;flex:1}.palette-sample i:first-child{flex:1.8}.palette-name{display:flex;align-items:center;justify-content:space-between;gap:2px;font-size:10px;line-height:1.4;margin-top:5px;white-space:nowrap}.palette-mark{font-size:8px}.palette-short{display:none}@media(max-width:900px){.ion-inside .palette-picker{left:18px;transform:none;width:calc(100% - 132px)}}@media(max-width:700px){.ion-inside .footer-base>a:last-child{color:var(--ion-ink)}.ion-inside .intro{background:linear-gradient(180deg,transparent,color-mix(in srgb,var(--inside-paper) 60%,transparent) 18%,color-mix(in srgb,var(--inside-paper) 34%,transparent) 52%,transparent 72%)}.ion-inside .site-footer{background:linear-gradient(0deg,color-mix(in srgb,var(--inside-paper) 85%,transparent),transparent 40%)}.ion-inside .palette-picker{left:10px;right:10px;bottom:max(10px,env(safe-area-inset-bottom));width:auto;padding:10px 8px 8px;border-radius:6px}.palette-options{gap:4px}.palette-options button{padding:5px;min-height:52px}.palette-name{font-size:11px}.palette-full{display:none}.palette-short{display:inline}.ion-inside .motion-controls{right:12px;bottom:calc(12px + env(safe-area-inset-bottom))}.ion-inside .motion-controls button{width:40px;height:40px}.ion-inside .hero-bottom{bottom:90px}.ion-inside .field-caption{bottom:180px}}.ion-inside .motion-controls{align-items:center}@media print{.ion-world.ion-inside{background:#fff;color:#000;padding-bottom:0}.palette-picker{display:none!important}}.ion-inside .particle-interface{position:absolute;inset:0;z-index:4;pointer-events:none;overflow:clip}.ion-inside .particle-interface canvas{position:absolute;pointer-events:none}.ion-inside [data-photon-ink]{-webkit-text-fill-color:transparent;text-shadow:none!important}.ion-inside [data-photon-exempt],.ion-inside [data-photon-exempt] *{-webkit-text-fill-color:currentColor}.ion-inside [data-photon-wire]{border-color:transparent!important}.ion-inside [data-photon-fill]{background:transparent!important}.ion-inside [data-photon-ink]::selection{-webkit-text-fill-color:var(--ion-ink);background:var(--inside-paper)}@media print{.ion-inside .particle-interface{display:none}.ion-inside [data-photon-ink]{-webkit-text-fill-color:currentColor}.ion-inside [data-photon-wire]{border-color:currentColor!important}}@media(forced-colors:active){.ion-inside .particle-interface{display:none}.ion-inside [data-photon-ink]{-webkit-text-fill-color:currentColor}}.website-review.ion-inside .waitlist-access,.website-review.ion-inside .source-math .math-route{color:var(--ion-ink)}.website-review.ion-inside .waitlist-access>span,.website-review.ion-inside .source-example>small,.website-review.ion-inside .footer-access>span{color:var(--ion-muted)}.website-review.ion-inside .chapter-label,.website-review.ion-inside .chapter h2 em,.website-review.ion-inside .phone-action,.website-review.ion-inside .source-words>strong span{color:var(--ion-accent)}.website-review.ion-inside .word-parts i,.website-review.ion-inside .gallery-boards i{color:var(--ion-accent);border-color:color-mix(in srgb,var(--ion-accent) 45%,transparent)}.website-review.ion-inside .math-route,.website-review.ion-inside .worksheet-lines i{border-color:var(--ion-accent)}.website-review.ion-inside .worksheet-lines i:nth-child(-n+2){background:color-mix(in srgb,var(--ion-accent) 30%,transparent)}.website-review.ion-inside .pen-drawing i,.website-review.ion-inside .pen-drawing em{border-color:var(--ion-accent);background:color-mix(in srgb,var(--ion-accent) 8%,transparent)}.website-review.ion-inside .pen-drawing b{background:repeating-linear-gradient(110deg,transparent 0 5px,var(--ion-accent) 5px 6px,transparent 6px 9px)}.website-review.ion-inside .pen-drawing em:after{border-left-color:var(--ion-accent)}
