:root{--paper:#fff;--cloud:#f1f8ff;--ice:#e6f4ff;--ink:#0c294a;--secondary:#466280;--blue:#1379df;--electric:#0085ff;--navy:#061a37;--border:#c9dded;--display:Georgia,'Times New Roman',serif;--body:'Aptos','Segoe UI',Inter,Arial,sans-serif;--max:1190px;--ease:cubic-bezier(.18,.7,.2,1)}
*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--paper);color:var(--ink);font:400 16px/1.74 var(--body);-webkit-font-smoothing:antialiased;overflow-x:hidden}body.nav-open{overflow:hidden}img{display:block;max-width:100%}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{line-height:1.14;letter-spacing:-.035em}h1,h2,h3{font-family:var(--display);font-weight:500}em{color:var(--blue);font-style:italic;font-weight:400}button,input,textarea,select{font:inherit}button{cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #03aafa;outline-offset:4px}.wrap{width:min(calc(100% - 90px),var(--max));margin-inline:auto}.narrow{max-width:830px}.centered{text-align:center;margin-inline:auto}.centered p{margin-inline:auto}.kicker,.eyebrow{display:inline-flex;align-items:center;gap:10px;color:#126ab1;letter-spacing:.17em;text-transform:uppercase;font:800 11px/1.5 var(--body)}.kicker.light{color:#87d7ff}.kicker-rule{height:1px;width:35px;background:currentColor;display:inline-block}h2{font-size:clamp(38px,5.5vw,73px)}h3{font-size:clamp(27px,3.3vw,43px)}p{color:var(--secondary)}.skip{position:fixed;z-index:1000;top:-80px;left:15px;padding:10px 18px;background:var(--navy);color:white}.skip:focus{top:15px}.btn{min-height:48px;padding:12px 22px;display:inline-flex;align-items:center;justify-content:center;gap:14px;border-radius:7px;border:1px solid var(--border);font-size:13px;font-weight:700;text-decoration:none;text-align:center;line-height:1.4;white-space:normal;transition:transform .3s var(--ease),box-shadow .3s,background .3s,color .3s}.btn:hover{transform:translateY(-3px)}.btn.primary{background:#0d5ec4;color:#fff;border-color:#0d5ec4;box-shadow:0 12px 30px #006cc021}.btn.primary:hover{background:#064c9d;box-shadow:0 15px 34px #006cc039}.btn.secondary{background:#fff;color:#0c4683}.btn.secondary:hover{background:var(--ice)}.btn.white{background:white;color:#0b376b;border:0}.text-link{display:inline-block;margin-top:26px;text-decoration:none;color:#136dc5;font-size:13px;font-weight:750;border-bottom:1px solid currentColor;padding-bottom:6px}.text-link.light{color:#a5e5ff}.reading-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:500;pointer-events:none}.reading-progress span{display:block;height:100%;width:100%;background:linear-gradient(90deg,#004fae,#59cafe);transform-origin:left;transform:scaleX(var(--read-progress,0))}
.site-header{height:79px;position:fixed;z-index:200;top:0;left:0;right:0;background:#ffffffeb;border-bottom:1px solid #e2edf5;backdrop-filter:blur(18px);transition:box-shadow .4s,background .4s}.site-header.scrolled{box-shadow:0 10px 30px #14325d0c;background:#fffffffa}.head-inner{width:min(calc(100% - 90px),1310px);height:100%;margin:auto;display:flex;align-items:center;gap:30px}.brand{display:flex;align-items:center;flex-shrink:0;text-decoration:none}.brand img{object-fit:contain;width:206px;height:auto;max-height:66px}.main-nav{display:flex;align-items:center;gap:24px;margin-left:auto}.main-nav>a{font-size:12px;font-weight:650;text-decoration:none;color:#31516e;white-space:nowrap;transition:color .2s}.main-nav>a:hover,.main-nav>a[aria-current]{color:#0875d5}.main-nav a.nav-pilot{border:1px solid #b7d8f5;color:#1164b6;border-radius:100px;padding:10px 17px}.menu-toggle{display:none;background:white;border:1px solid #bfdaf3;color:var(--ink);border-radius:6px;padding:9px 14px;font-size:13px;font-weight:700}
.hero{position:relative;min-height:780px;min-height:100svh;padding:130px 0 100px;display:grid;align-items:center;isolation:isolate;overflow:hidden;background:radial-gradient(ellipse at 50% 70%,#ecf8ff 0,#fff 75%)}.hero-image{position:absolute;z-index:-2;inset:0;background:url('../img/fluid-hero.webp') center 64%/cover;opacity:.54;mask-image:linear-gradient(to bottom,transparent 1%,#000 38%,#000 93%,transparent);transform:scale(1.09);animation:cinemaEnter 2.2s var(--ease) both}.hero-skyline{position:absolute;z-index:-1;inset:0;background:linear-gradient(180deg,#fffefbe9 0%,#ffffffdb 22%,#ffffffc8 61%,#eaf7ffd6 100%)}.hero-lines{position:absolute;inset:0;pointer-events:none;opacity:.4}.hero-lines i{display:block;position:absolute;border:1px solid #86beeb;border-radius:50%;width:100vw;height:56vw;min-height:420px;left:50%;top:48%;transform:translate(-50%,-50%) rotate(-15deg);animation:ellipseBreathe 12s ease-in-out infinite}.hero-lines i:nth-child(2){width:80vw;height:43vw;min-height:290px;animation-delay:-3s}.hero-lines i:nth-child(3){width:58vw;height:29vw;min-height:220px;animation-delay:-6s}.hero-copy{position:relative;text-align:center;max-width:1000px}.hero h1{font-size:clamp(58px,8.4vw,120px);letter-spacing:-.065em;line-height:1.02;margin:26px auto 20px;color:#0c2a52}.hero h1 em{white-space:normal}.hero-copy>p{max-width:650px;margin:0 auto;font-size:clamp(17px,1.8vw,22px);line-height:1.66;color:#456481}.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:30px}.hero-kicker{justify-content:center}.hero-rise{animation:riseIn 1s var(--ease) both}.hero h1 .hero-rise:first-child{animation-delay:.28s}.hero h1 .hero-rise:last-child{animation-delay:.5s}.hero-copy>p.hero-rise{animation-delay:.8s}.hero-actions.hero-rise{animation-delay:1.05s}.floating-moment{position:absolute;bottom:13%;left:7%;font:700 10px/1.5 var(--body);letter-spacing:.14em;color:#6f95bb;background:#ffffffdf;border:1px solid #d7eafa;border-radius:9px;padding:12px 18px;box-shadow:0 20px 50px #2872b615;animation:floaty 8s ease-in-out infinite}.floating-moment strong{display:block;font-size:14px;color:#143d6c;letter-spacing:0}.moment-two{left:auto;right:7%;bottom:21%;animation-delay:-3s}.hero-edge{position:absolute;left:35px;bottom:45px;letter-spacing:.22em;font-size:9px;font-weight:800;color:#478dc4;writing-mode:vertical-rl}.scroll-cue{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);letter-spacing:.18em;font-size:10px;font-weight:700;color:#5188bc;white-space:nowrap}
.story-dark{position:relative;isolation:isolate;min-height:680px;padding:125px 0;background:#061b3c;display:flex;align-items:center;overflow:hidden}.story-dark-photo{position:absolute;inset:0;z-index:-2;background:url('../img/teacher-class.webp') center 30%/cover;filter:grayscale(.6) saturate(.7);opacity:.28;transform:scale(1.02)}.story-dark:after{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#051a37ef,#08244bd4 59%,#031c37a6)}.story-dark-inner{max-width:1000px}.story-dark h2{color:#fff;margin:23px 0;font-size:clamp(41px,5.8vw,83px)}.story-dark h2 em{color:#85d4ff}.story-dark-inner>p{color:#d8e9f9;max-width:680px;font-size:19px}.thoughts{display:flex;flex-wrap:wrap;gap:9px;margin-top:37px}.thought{padding:10px 14px;border-radius:100px;border:1px solid #7190af84;background:#ffffff0b;color:#e5f5ff;font-size:13px;transition:background .25s}.thought.active,.thought:hover{background:#c0eaff;color:#123b61}.thought-answer{margin-top:22px;min-height:52px;color:#7fdaff;font-style:italic;font:italic 23px/1.55 var(--display);max-width:760px}
.section-intro{max-width:790px;margin-bottom:50px}.section-intro.center{margin-inline:auto;text-align:center}.section-intro h2,.chapter-content h2{margin:15px 0 23px}.section-intro p{max-width:760px;font-size:18px}.section-intro.center p{margin-inline:auto}.section-intro p+p{margin-top:13px}.shift-section,.zpd-section,.cycle-section,.practical-section,.lesson-tease,.closing-invite,.chapter-content{padding:110px 0}.shift-section{background:#fff}.shift-gallery{display:grid;grid-template-columns:1.25fr .8fr;grid-template-rows:250px 250px;gap:17px}.shift-gallery figure{margin:0;position:relative;overflow:hidden;border-radius:12px;background:#e6f2fd;box-shadow:0 15px 45px #0c458017}.shift-gallery img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s}.shift-gallery figure:hover img{transform:scale(1.04)}.shift-gallery figcaption{position:absolute;bottom:12px;left:15px;right:15px;background:#ffffffed;padding:9px 12px;border-radius:6px;font-size:13px;font-weight:700;color:#13406e}.shift-main{grid-row:1 / 3}.equation-art{height:100%;display:flex;flex-direction:column;justify-content:center;align-items:center;background:linear-gradient(135deg,#edf8ff,#addefc);position:relative}.equation-art small{letter-spacing:.12em;font-size:10px;font-weight:800;color:#467da9}.equation-art span{font:500 66px var(--display);color:#0e467e}.equation-art b{font:500 50px var(--display);color:#178bea}.equation-art i{position:absolute;font-size:44px;font-style:normal;color:#46a4dc;right:20px;top:16px}
.zpd-section{background:#edf7ff}.zpd-layout{display:grid;grid-template-columns:.82fr 1.18fr;gap:50px;align-items:center}.rings{display:flex;justify-content:center;align-items:center;min-width:0}.ring{border-radius:50%;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center}.ring.outer{width:min(100%,470px);aspect-ratio:1;border:1px solid #a1c8eb;background:#d5edff;box-shadow:0 30px 65px #176cb614}.ring.middle{width:75%;aspect-ratio:1;border:1px solid #71aede;background:#a8d6fc;box-shadow:0 0 30px #e6f7ff inset}.ring.core{width:61%;aspect-ratio:1;background:#1769bd;color:#fff;font-size:clamp(15px,2vw,21px);line-height:1.35;letter-spacing:.03em}.ring.core strong{color:white}.ring.outer>span{color:#2b6598;margin-bottom:14px;font-size:10px;font-weight:800;letter-spacing:.14em}.ring.middle>span{color:#165a97;margin-bottom:10px;font-size:10px;font-weight:800;letter-spacing:.12em}.zpd-play{background:#fff;padding:32px;border:1px solid #c7e3f7;border-radius:14px;box-shadow:0 16px 42px #085a9620}.zpd-play h3{margin:7px 0 13px}.zpd-play>p{font-size:14px}.stage-switch{display:flex;flex-wrap:wrap;gap:7px;margin:22px 0}.stage-switch button{border:1px solid #bddaf2;background:#edf7ff;border-radius:8px;color:#265d8b;font-size:12px;font-weight:700;padding:10px}.stage-switch button.selected{background:#0c66bf;border-color:#0c66bf;color:#fff}.math-challenge{background:#f8fcff;border:1px solid #cce3f3;border-radius:11px;padding:22px}.challenge-top{display:flex;justify-content:space-between;gap:10px;font-size:9px;letter-spacing:.12em;font-weight:800;color:#5285ac}.math-challenge h4{font:500 clamp(30px,4vw,45px)/1.2 var(--display);color:var(--ink);margin:14px 0}.counter-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:5px;max-width:285px;margin:17px 0}.counter-grid span{height:18px;border-radius:5px;background:#d2e7f6;transition:background .4s,transform .4s}.counter-grid span.active{background:#1484e8;transform:scale(.94)}.math-challenge label{display:block;font-size:12px;font-weight:700;color:#3e698a}.answer-row{display:flex;gap:8px;margin-top:7px}.answer-row input{width:min(50%,190px);min-width:90px;border-radius:6px;border:1px solid #b5d4ea;padding:9px 13px}.answer-row .btn{min-height:45px}.micro-actions{display:flex;gap:15px;align-items:center;flex-wrap:wrap;margin-top:17px}.micro-actions button{color:#1269b9;border:0;border-bottom:1px solid;background:transparent;padding:2px 0;font-size:12px;font-weight:700}.micro-actions span{font-size:12px;color:#6787a0}.feedback{margin-top:13px;background:white;border-left:3px solid #4ba5e4;padding:10px 12px;font-size:13px}.feedback[data-state=success]{border-color:#16836f;background:#f0fff9}.feedback[data-state=try]{border-color:#d79d45;background:#fff9ef}.small-note{font-size:12px;color:#6c879d;margin-top:18px}
.cycle-section{background:white}.cycle-story{background:#f6fbff;border:1px solid #d4e7f5;border-radius:13px;overflow:hidden}.cycle-trail{display:grid;grid-template-columns:repeat(5,1fr);background:#e8f4ff}.cycle-trail button{border:0;border-bottom:3px solid transparent;border-right:1px solid #d0e5f7;background:transparent;padding:21px 10px;color:#3a688e;font-size:14px;font-weight:700;transition:background .3s}.cycle-trail button span{display:block;font-size:10px;letter-spacing:.12em;font-weight:800}.cycle-trail button[aria-pressed=true]{border-bottom-color:#126cd1;background:#fff;color:#0e5ba5}.cycle-detail{display:grid;grid-template-columns:1.4fr .6fr;gap:30px;padding:48px;align-items:center;min-height:300px}.cycle-detail h3{margin:7px 0 13px}.cycle-detail blockquote{font:italic 22px/1.5 var(--display);color:#2370b7;border-left:3px solid #5dc9f6;padding-left:20px;margin:22px 0 0}.cycle-illustration{position:relative;height:195px;display:flex;justify-content:center;align-items:center;flex-direction:column}.cycle-illustration strong{font:500 116px/1 var(--display);color:#117dde;z-index:1}.cycle-illustration small{font-size:10px;letter-spacing:.15em;color:#6b9ac0;font-weight:800;text-align:center;z-index:1}.cycle-arc{position:absolute;inset:0;border:1px solid #89bcea;border-radius:50%;transform:rotate(-24deg)}.brand-corner{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin-top:28px;border-top:1px solid var(--border);padding-top:24px}.brand-corner img{width:180px;height:auto}.brand-corner p{flex:1;min-width:240px;font-size:14px}.brand-corner .text-link{margin-top:0}
.practical-section{background:#fff}.practical-frame{position:relative;min-height:560px;border-radius:12px;overflow:hidden;background:#081d3c}.practical-frame>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.47)}.practical-overlay{position:relative;max-width:770px;min-height:560px;padding:70px;display:flex;flex-direction:column;justify-content:center;align-items:flex-start}.practical-overlay h2{color:white;margin:20px 0;font-size:clamp(43px,5.5vw,73px)}.practical-overlay h2 em{color:#98dcff}.practical-overlay p{color:#e7f2fb;font-size:18px;max-width:580px}.practical-overlay .btn{margin-top:25px}.mini-notes{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#4781b7;font-size:11px;font-weight:800;letter-spacing:.14em;margin-top:18px}
.lesson-tease{background:#f3f9ff}.lesson-tease-layout{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:70px}.lesson-tease h2{margin:16px 0 21px}.lesson-tease p{font-size:17px}.lesson-tease .btn{margin-top:27px}.lesson-photo{position:relative;border-radius:12px;overflow:hidden;min-height:445px}.lesson-photo img{width:100%;height:445px;object-fit:cover}.note-overlay{position:absolute;bottom:18px;left:18px;right:18px;background:#fffefcdd;padding:16px 18px;border-radius:8px;color:#224e76;line-height:1.45}.note-overlay strong{display:block;color:#0e6ab7}
.closing-invite{position:relative;background:radial-gradient(ellipse at 50% 100%,#c8ebff,#f7fbff 68%,#fff);text-align:center}.closing-invite h2{margin:20px 0 25px}.closing-inner{max-width:900px}.closing-inner>p{font-size:18px;max-width:650px;margin:auto}
.subhero{position:relative;overflow:hidden;isolation:isolate;min-height:540px;display:flex;align-items:center;background:#f3f9ff;padding:145px 0 85px}.subhero-art{position:absolute;inset:0;z-index:-2;background-size:cover;background-position:50% 48%;opacity:.26;filter:saturate(1.25);mask-image:linear-gradient(90deg,transparent 5%,#000 95%)}.subhero:after{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#f8fcfffa 0%,#f8fcfff4 48%,#f8fcff60 100%)}.subhero h1{font-size:clamp(51px,6.9vw,96px);margin:20px 0}.subhero p{font-size:19px;max-width:675px}.subhero-marker{position:absolute;right:5%;bottom:25px;letter-spacing:.16em;font-size:10px;font-weight:800;color:#5290be}.subhero-marker span{color:var(--blue)}
.chapter-content{background:white}.chapter-content.pale{background:#f1f8ff}.chapter-content.navy-banner{background:#071e41;color:white}.chapter-content h2{font-size:clamp(37px,5vw,68px)}.chapter-content p{font-size:17px}.article-layout{display:grid;grid-template-columns:1fr .9fr;align-items:center;gap:75px}.article-layout p+p{margin-top:15px}.article-layout .btn{margin-top:26px}.feature-photo{position:relative;overflow:hidden;border-radius:12px;min-height:420px;background:#eef7ff}.feature-photo img{width:100%;height:470px;object-fit:cover}.feature-photo span{display:block;position:absolute;left:14px;bottom:14px;right:14px;border-radius:6px;padding:10px 14px;font-size:12px;font-weight:700;background:#ffffffed;color:#17518a}.text-steps article{display:flex;align-items:start;gap:17px;margin:22px 0}.text-steps article>b{font:italic 27px var(--display);color:#1472cf}.text-steps article strong{font-size:17px}.text-steps article p{font-size:14px;margin-top:4px}.math-explain{display:flex;flex-wrap:wrap;gap:10px;margin:25px 0}.math-explain>*{padding:12px 15px;background:#ebf6ff;color:#0c5398;border-radius:7px;font-size:16px}.math-explain strong{color:white;background:#0b72cc}.five-list{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}.five-list article{border:1px solid #cee4f4;background:white;padding:20px;border-radius:9px;min-height:220px}.five-list article>span{font:italic 37px var(--display);color:#2081cf}.five-list h3{font:500 24px var(--display);margin:25px 0 10px}.five-list p{font-size:13px}.navy-banner h2{color:white}.navy-banner p{color:#cce6fa}.center-banner{max-width:820px;text-align:center}.center-banner .proximal-full{width:260px;margin:25px auto;filter:drop-shadow(0 12px 28px #020d23a6)}.center-banner .btn{margin-top:22px}.center-banner p{margin:auto}.stat-pair{display:flex;gap:20px;margin-top:45px}.big-stat{flex:1;padding:28px;border:1px solid #d4e8f7;border-radius:10px;background:#f5fbff}.big-stat strong{font:500 clamp(65px,7vw,110px)/1 var(--display);color:#116bbc;display:block}.big-stat small{font-size:.5em}.big-stat span{font-size:14px;color:#52708e}.image-evidence{display:grid;grid-template-columns:.9fr 1fr;gap:80px;margin-top:100px;align-items:center}.image-stack{position:relative;overflow:hidden;border-radius:12px}.image-stack img{height:500px;width:100%;object-fit:cover}.image-stack span{position:absolute;bottom:18px;left:18px;right:18px;padding:13px;background:#ffffffdb;font-size:12px;letter-spacing:.08em;font-weight:800;color:#104d87}.source-links{display:grid;gap:10px;max-width:680px;margin:25px auto}.source-links a{display:block;text-align:left;border:1px solid #c6dff3;background:white;padding:12px 17px;border-radius:7px;text-decoration:none;font-size:14px;font-weight:700;color:#0c569e}.source-links a:hover{background:#e0f4ff}
.lab-shell{background:#fff;border:1px solid #cfe4f4;border-radius:12px;overflow:hidden;box-shadow:0 20px 50px #2b7db912}.lab-topics{display:grid;grid-template-columns:repeat(4,1fr);background:#eaf5fe}.lab-topics button{padding:20px 8px;border:0;border-bottom:3px solid transparent;background:transparent;font-size:13px;font-weight:700;color:#2d658e}.lab-topics button[aria-pressed=true]{background:white;border-bottom-color:#187fdb;color:#074882}.lab-content{display:grid;grid-template-columns:1.25fr .75fr;align-items:stretch;gap:0}.lab-copy{padding:45px}.lab-copy h3{margin:15px 0}.lab-copy>p{font-size:17px}.lab-photo{margin:0;position:relative;background:#d5e9fc}.lab-photo img{width:100%;height:100%;min-height:430px;object-fit:cover}.lab-photo figcaption{position:absolute;bottom:20px;left:20px;right:20px;background:#fff;padding:12px;color:#174b7c;font-size:13px;font-weight:700;border-radius:7px}.lab-visual{margin:25px 0;color:#316c9e}.lab-visual p{font-size:10px;letter-spacing:.13em;font-weight:800;margin:9px 0}.quarters{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;max-width:320px}.quarters i,.math-grid i{height:45px;background:#d5e9f9;border-radius:5px}.quarters i.filled,.math-grid i.filled{background:#1886e7}.math-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;max-width:300px}.math-grid i{height:30px}.pattern-blocks{display:flex;gap:8px}.pattern-blocks span,.algebra-visual{background:#ebf6ff;border:1px solid #c1dff5;color:#1473c7;padding:18px;font-size:28px;border-radius:7px}.lab-choices{display:flex;flex-wrap:wrap;gap:10px}.lab-choices button{border:1px solid #b5d7ed;padding:10px 21px;background:white;border-radius:7px;font-size:22px;color:#144a79}.lab-choices button[aria-pressed=true]{background:#d9efff;border-color:#1784df}.lab-tools{display:flex;gap:23px;margin-top:17px}.lab-tools button{padding:4px 0;border:0;border-bottom:1px solid;background:transparent;color:#116dbd;font-size:13px;font-weight:700}
.lesson-progress{display:flex;justify-content:space-between;gap:12px;margin-bottom:21px;padding:12px 19px;border-radius:8px;background:#e8f4ff;color:#2c73ac;font-size:11px;font-weight:800;letter-spacing:.11em}.lesson-preview{display:grid;grid-template-columns:.9fr 1.1fr;border:1px solid #cde4f5;border-radius:12px;overflow:hidden;background:#f8fcff}.lesson-image{position:relative;min-height:610px}.lesson-image img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}.lesson-caption{position:absolute;bottom:18px;left:18px;right:18px;padding:15px;background:#ffffffeb;border-radius:7px;font-size:14px;color:#164876}.lesson-caption strong{color:#006cc6}.lesson-details{padding:22px}.lesson-step{border-bottom:1px solid #cfdfec;padding:8px 0}.lesson-step summary{cursor:pointer;display:flex;align-items:center;gap:12px;list-style:none;padding:14px 8px}.lesson-step summary::-webkit-details-marker{display:none}.lesson-step summary>span{font:italic 23px var(--display);color:#1285df}.lesson-step summary>strong{flex:1;font-size:15px}.lesson-step summary>small{font-size:12px;color:#6b849a}.lesson-step p{padding:3px 17px 18px 45px;font-size:14px}.lesson-step[open]{background:#eaf5ff;border-radius:6px}
.audience-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.audience-grid a{border:1px solid #cae0f3;border-radius:10px;padding:24px;text-decoration:none;background:#f8fcff;min-height:214px;transition:transform .3s,box-shadow .3s}.audience-grid a:hover{transform:translateY(-5px);box-shadow:0 15px 30px #276ea020}.audience-grid strong{font:500 28px var(--display)}.audience-grid p{font-size:14px;margin:15px 0}.audience-grid span{color:#1682d5;font-size:12px;font-weight:800}.pilot-path{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.pilot-path>div{position:relative;border-top:2px solid #2f9eea;padding-top:17px}.pilot-path b{font:italic 36px var(--display);color:#1f8cda}.pilot-path h3{font:500 25px var(--display);margin:15px 0}.pilot-path p{font-size:14px}.enquiry-layout{display:grid;grid-template-columns:1fr 1fr;gap:76px;align-items:start}.enquiry-layout h2{font-size:clamp(37px,5vw,64px)}.small-photo{margin-top:35px;min-height:230px}.small-photo img{height:240px}.pilot-form{padding:30px;border:1px solid #cfe3f2;border-radius:12px;background:#f7fbff;box-shadow:0 17px 40px #235d9110}.pilot-form label{display:block;margin-bottom:16px;font-size:13px;font-weight:700;color:#285a84}.pilot-form label>span{color:#ad3f3f}.pilot-form input,.pilot-form select,.pilot-form textarea{width:100%;display:block;margin-top:6px;padding:11px 13px;border:1px solid #bdd6e8;background:#fff;border-radius:6px;font-size:15px;color:#193650}.form-buttons{display:flex;flex-wrap:wrap;gap:9px;margin-top:10px}.pilot-form #form-status{font-size:12px;margin-top:18px}.faq{margin:28px 0}.faq details{padding:22px 0;border-bottom:1px solid #cbddec}.faq summary{cursor:pointer;font:600 19px/1.4 var(--body);color:#123e69}.faq details p{margin-top:10px;font-size:15px}.ecosystem{display:flex;flex-direction:column;align-items:center;gap:14px;margin:35px auto}.ecosystem span,.ecosystem strong{border:1px solid #bfd9ea;border-radius:8px;background:#fff;padding:15px 28px;text-align:center;min-width:310px}.ecosystem strong{background:#0d6bc8;color:#fff}.ecosystem i{color:#197fd8}
.site-footer{position:relative;overflow:hidden;background:#edf7ff;padding:95px 0 0}.footer-wave{position:absolute;inset:0;opacity:.1;pointer-events:none;background:url('../img/fluid-hero.webp') center/cover;mask-image:linear-gradient(to bottom,transparent,#000 90%)}.footer-top{position:relative;display:grid;grid-template-columns:1fr .9fr;gap:80px;padding-bottom:75px}.footer-lead h2{font-size:clamp(38px,4.7vw,63px);margin:15px 0}.footer-lead p{max-width:520px}.footer-lead .btn{margin-top:25px}.footer-nav{display:flex;justify-content:space-between;gap:35px}.footer-nav>div{display:flex;flex-direction:column;align-items:start;gap:11px}.footer-nav strong{font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:#255b87}.footer-nav a{font-size:13px;text-decoration:none;color:#456580}.footer-nav a:hover{color:#0069c2;text-decoration:underline}.footer-bottom{position:relative;display:flex;align-items:center;gap:30px;border-top:1px solid #cadeef;padding:17px 0;font-size:11px;color:#58758c}.footer-bottom img{width:152px;height:auto}
/* Motion: opt-in JS reveals and an elegant internal navigation wipe */
.reveal{opacity:1;transform:none}.motion-enabled .reveal:not(.visible){opacity:0;transform:translateY(38px);filter:blur(4px)}.motion-enabled .reveal{transition:opacity .9s var(--ease),transform .9s var(--ease),filter .9s var(--ease);transition-delay:var(--delay,0ms)}.motion-enabled .reveal.visible{opacity:1;transform:none;filter:none}.page-curtain{position:fixed;inset:0;z-index:600;background:linear-gradient(110deg,#eefaff,#2f95e8 60%,#08418b);pointer-events:none;transform:translateX(-101%)}.page-curtain.entering{animation:wipeIn .5s var(--ease) forwards}.page-curtain.leaving{animation:wipeOut .5s var(--ease) forwards}
@keyframes wipeIn{from{transform:translateX(-101%)}to{transform:translateX(0)}}@keyframes wipeOut{from{transform:translateX(0)}to{transform:translateX(105%)}}@keyframes riseIn{from{opacity:0;transform:translateY(45px);filter:blur(7px)}to{opacity:1;transform:translateY(0);filter:blur(0)}}@keyframes cinemaEnter{from{transform:scale(1.25);filter:blur(13px);opacity:0}to{transform:scale(1.09);filter:blur(0);opacity:.54}}@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-13px)}}@keyframes ellipseBreathe{0%,100%{scale:1;opacity:.7}50%{scale:1.06;opacity:.28}}
@media(max-width:1100px){.head-inner{width:min(calc(100% - 36px),1300px);gap:12px}.brand img{width:175px}.main-nav{gap:13px}.main-nav a{font-size:11px}.wrap{width:min(calc(100% - 56px),var(--max))}.floating-moment{left:4%}.moment-two{right:4%}}
@media(max-width:850px){.site-header{height:69px}.head-inner{width:calc(100% - 38px)}.brand img{width:162px}.menu-toggle{display:block;margin-left:auto}.main-nav{display:none;position:absolute;top:69px;left:0;right:0;padding:22px;background:#fff;box-shadow:0 20px 30px #0b46751a;flex-direction:column;align-items:stretch;gap:0}.main-nav.open{display:flex}.main-nav a{font-size:14px;padding:12px;border-bottom:1px solid #edf3f8}.main-nav a.nav-pilot{margin-top:14px;text-align:center}.hero{min-height:700px}.floating-moment{display:none}.hero-edge{display:none}.story-dark-inner{max-width:none}.zpd-layout{grid-template-columns:1fr}.rings{max-width:420px;margin-inline:auto}.article-layout,.lesson-tease-layout,.enquiry-layout{grid-template-columns:1fr;gap:36px}.image-evidence{grid-template-columns:1fr;gap:40px}.feature-photo img{height:390px}.five-list{grid-template-columns:repeat(3,1fr)}.audience-grid,.pilot-path{grid-template-columns:repeat(2,1fr)}.footer-top{grid-template-columns:1fr;gap:45px}.shift-gallery{grid-template-rows:220px 220px}.lab-content{grid-template-columns:1fr}.lab-photo{display:none}.lesson-preview{grid-template-columns:1fr}.lesson-image{min-height:320px}.lesson-image img{height:320px}.footer-nav{justify-content:flex-start;gap:65px}}
@media(max-width:560px){.wrap{width:calc(100% - 38px)}.hero{padding:120px 0 90px;min-height:650px}.hero h1{font-size:clamp(48px,11.7vw,71px);line-height:1.08}.hero-copy>p{font-size:16px}.hero-kicker{font-size:9px;letter-spacing:.1em}.hero-actions .btn{width:100%}.story-dark{min-height:650px;padding:80px 0}.story-dark h2{font-size:43px}.story-dark-inner>p{font-size:16px}.thought-answer{font-size:20px}.shift-section,.zpd-section,.cycle-section,.practical-section,.lesson-tease,.closing-invite,.chapter-content{padding:75px 0}.section-intro h2,h2{font-size:clamp(38px,10vw,53px)}.section-intro p{font-size:16px}.shift-gallery{display:flex;flex-direction:column}.shift-gallery figure{height:245px}.shift-gallery .shift-main{height:330px}.zpd-play{padding:17px}.ring.outer{width:min(100%,370px)}.stage-switch button{font-size:11px;padding:9px}.math-challenge{padding:17px}.cycle-trail{grid-template-columns:repeat(5,1fr)}.cycle-trail button{font-size:10px;padding:15px 3px}.cycle-trail button span{font-size:9px}.cycle-detail{grid-template-columns:1fr;gap:5px;padding:25px}.cycle-illustration{height:100px}.cycle-illustration strong{font-size:70px}.cycle-arc{width:165px;margin:auto;left:0;right:0}.cycle-illustration small{display:none}.brand-corner{align-items:flex-start}.practical-frame,.practical-overlay{min-height:500px}.practical-overlay{padding:30px}.practical-overlay h2{font-size:44px}.practical-overlay p{font-size:16px}.lesson-photo img{height:330px}.subhero{min-height:470px;padding:130px 0 75px}.subhero h1{font-size:clamp(46px,10vw,65px)}.subhero p{font-size:16px}.subhero-marker{left:20px;right:auto;font-size:9px}.five-list,.audience-grid,.pilot-path{grid-template-columns:1fr}.five-list article{min-height:0}.lab-copy{padding:23px}.lab-topics{grid-template-columns:repeat(2,1fr)}.lesson-progress{flex-wrap:wrap;font-size:10px}.big-stat strong{font-size:65px}.stat-pair{flex-direction:column}.footer-nav{gap:32px;flex-wrap:wrap}.footer-top{gap:35px}.footer-bottom{flex-direction:column;align-items:start;gap:5px}.pilot-form{padding:19px}.form-buttons .btn{width:100%}.enquiry-layout h2{font-size:44px}}
@media(max-width:340px){.hero h1{font-size:43px}.head-inner{width:calc(100% - 22px)}.brand img{width:140px}.counter-grid span{height:15px}.answer-row{flex-wrap:wrap}.footer-lead h2{font-size:37px}.cycle-trail button{font-size:9px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.reveal,.motion-enabled .reveal:not(.visible){opacity:1!important;transform:none!important;filter:none!important}.hero-image{transform:none}}