/* Errata's living notebook — the public site. */
:root{--hand:'Caveat','Segoe Print','Bradley Hand',cursive;--cobalt:#244ccc;--blue-soft:#e7ecff;--paper:#f8f6ef;--ink:#172d42;--gold:#edca76}
html[data-theme=dark]{--paper:#171c24;--sheet:#202732;--sheet-2:#282f3b;--ink:#f0eee7;--ink-2:#c0c6cf;--ink-3:#a5adba;--rule:#434c5a;--rule-2:#343d4b;--cobalt:#9fb7ff;--blue-soft:#2b3a5c;--gold:#edca76}
.hand{font-family:var(--hand);font-weight:600;letter-spacing:-.025em;font-style:normal}.notebook-home h2{font-family:var(--sans);font-size:clamp(34px,4vw,54px);font-weight:700;letter-spacing:-.055em;line-height:1.12}.notebook-home h2 .hand{font-size:1.2em;color:var(--cobalt)}.notebook-home .section-kicker{font-size:11px;letter-spacing:.13em;margin-bottom:22px}.notebook-home .section-space{padding-block:100px}.notebook-home .btn-primary{background:var(--cobalt);border-color:var(--cobalt);color:#fff;box-shadow:0 4px 0 #152f88;border-radius:12px}.notebook-home .btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 0 #152f88}.notebook-home .btn-primary:active{transform:translateY(3px);box-shadow:0 1px 0 #152f88}.notebook-home .btn-primary:disabled{transform:none;box-shadow:none}.nav-in{height:82px}.nav-explore{gap:24px}.nav-explore a{font-size:13px}.nav{background:color-mix(in srgb,var(--paper) 94%,transparent)}.foot{padding-top:40px}.footer-top{padding-bottom:30px}.footer-top>div>p{font-size:14px;max-width:270px}.footer-top nav{gap:12px}.footer-top .brand{font-size:28px}.footer-top .brand img{width:40px;height:40px}.footer-toplink{font-size:13px}
.notebook-hero{display:grid;grid-template-columns:1.05fr 1fr;align-items:center;gap:30px;min-height:690px;padding-block:65px 70px}.notebook-copy h1{font:750 clamp(58px,6.5vw,88px)/1.02 var(--sans);letter-spacing:-.07em;margin:28px 0}.notebook-copy h1 .hand{color:var(--cobalt);font-size:1.28em;line-height:.78;display:inline-block;position:relative;letter-spacing:-.05em;transform:rotate(-4deg);margin:0 0 8px -4px}.notebook-copy h1 .hand::after{content:'';position:absolute;bottom:-12px;left:8px;width:93%;height:11px;border-top:4px solid var(--gold);border-radius:50%;transform:rotate(-2deg)}.notebook-copy .eyebrow{font-size:11px;letter-spacing:.1em}.hero-intro{font-size:17px;line-height:1.8;color:var(--ink-2);margin-top:33px}.notebook-copy .hero-cta{margin-top:28px;gap:23px;flex-wrap:wrap}.notebook-copy .hero-note{font-size:13px;margin-top:21px}.notebook-scene{height:550px;position:relative;perspective:1300px;isolation:isolate}.notebook-object{position:absolute;width:310px;height:400px;top:85px;left:calc(50% - 155px);transform:rotateX(13deg) rotateY(-22deg) rotateZ(10deg);transform-style:preserve-3d;transition:transform .3s ease-out}.book-cover{position:absolute;inset:0;border-radius:8px 19px 19px 8px;color:#f6e8c7;background:radial-gradient(ellipse at top left,#365369,#122b40 75%);box-shadow:inset 0 0 0 1px #718192,12px 14px 24px #10283e30;transform:translateZ(18px);overflow:hidden;padding:29px 30px}.book-cover::after{content:'';position:absolute;inset:0;pointer-events:none;opacity:.1;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' opacity='.8' filter='url(%23n)'/%3E%3C/svg%3E")}.book-pages{position:absolute;inset:4px -9px -9px 7px;background:repeating-linear-gradient(#eee8d9 0 2px,#d4cabb 2px 3px);border-radius:9px 20px 20px 9px;box-shadow:6px 8px 0 #162c40}.book-top{display:flex;align-items:center;gap:14px}.book-top img{border-radius:50%;width:46px;height:46px}.book-top span{font:10px/1.6 var(--mono);letter-spacing:.15em}.cover-rule{height:1px;background:#a7977759;margin-top:22px}.book-cover>p{font:700 30px/1.2 var(--sans);letter-spacing:-.035em;margin:23px 0}.book-cover .hand{color:#edca76;font-size:62px;line-height:.95;display:block;font-weight:600;transform:rotate(-5deg);margin-top:5px}.cover-bottom{display:grid;gap:8px;font:8px var(--mono);letter-spacing:.07em;color:#ddcfb3}.cover-bottom b{font-size:17px;font-weight:400}.cover-bottom span:last-child{margin-top:8px}.book-spine{position:absolute;inset:0 auto 0 9px;width:6px;box-shadow:2px 0 7px #0003;border-right:1px solid #0004}.book-tab{position:absolute;right:-46px;top:49px;background:#edca76;color:#1a3043;font:700 17px var(--hand);padding:11px 14px;border-radius:0 8px 8px 0;transform:translateZ(2px)}.book-sticker{position:absolute;bottom:17px;right:-38px;width:115px;height:115px;background:#eef0ff;color:#2743a5;border:6px solid #fff;outline:1px solid #d5dcee;display:grid;align-content:center;text-align:center;transform:translateZ(45px) rotateZ(-22deg);box-shadow:0 5px 9px #102b4020;border-radius:50%;font:22px/.9 var(--hand)}.book-sticker strong{font-weight:600}.book-sticker i{font:32px var(--sans);margin-top:6px}.scene-note{position:absolute;top:14px;left:20%;font-size:28px;color:var(--ink-2);transform:rotate(-7deg)}.scene-note span{display:block;text-align:center;font-size:43px;line-height:.7}.notebook-shadow{position:absolute;bottom:15px;left:13%;width:80%;height:40px;background:#18304624;filter:blur(20px);border-radius:50%;transform:rotate(-7deg)}.pencil{position:absolute;bottom:45px;left:5%;height:235px;width:13px;border-radius:4px;background:linear-gradient(90deg,#a57420 0 15%,#f3d47c 15% 65%,#c59642 65% 90%,#8d6824 90%);transform:rotate(25deg);box-shadow:8px 4px 13px #1a314029}.pencil::after{content:'';position:absolute;bottom:-32px;border-left:6.5px solid transparent;border-right:6.5px solid transparent;border-top:32px solid #ceb288}.pencil::before{content:'';position:absolute;top:-15px;height:17px;left:0;width:100%;background:#c99789;border-radius:4px 4px 0 0;border-bottom:5px solid #8f9cab}.doodle-spark{position:absolute;right:0;top:78px;color:var(--cobalt);font-size:60px;transform:rotate(-14deg)}.scene-caption{position:absolute;bottom:-22px;left:0;right:0;text-align:center;color:var(--ink-2);font:12px var(--mono)}.proof-ribbon{display:flex;align-items:center;justify-content:space-between;gap:30px;border-block:1px solid var(--rule);padding-block:23px;font-size:12px;color:var(--ink-2)}.proof-ribbon b{font-size:17px;color:var(--ink);margin-right:7px}
/* Scroll opens the stack in three beats; all copy remains readable without JS. */
.scroll-story{height:225vh;position:relative;--spread:0;--turn:0}.story-sticky{height:calc(100vh - 118px);min-height:600px;position:sticky;top:118px;display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:50px}.story-copy h2{margin:0 0 35px}.story-steps{display:grid;gap:0;margin-bottom:27px}.story-step{display:flex;gap:18px;position:relative;padding:14px 0 16px 18px;border-left:2px solid var(--rule);opacity:.68;transition:opacity .35s,border-color .35s}.story-step.is-active{opacity:1;border-color:var(--cobalt)}.story-step>span{font:12px var(--mono);padding-top:6px}.story-step h3{font:700 18px/1.4 var(--sans);margin:0 0 6px;letter-spacing:-.025em}.story-step p{font-size:14px;line-height:1.7;margin:0;max-width:34ch;color:var(--ink-2)}.paper-stage{height:510px;position:relative;perspective:1500px;transform-style:preserve-3d}.stage-ring{position:absolute;width:440px;height:440px;max-width:100%;border:1px solid var(--rule);border-radius:50%;top:20px;left:0;transform:translateZ(-240px) rotateX(30deg) rotateY(-22deg)}.stage-ring::after{content:'';position:absolute;inset:35px;border:1px dashed var(--rule);border-radius:50%}.floating-page{position:absolute;top:78px;left:calc(50% - 174px);width:348px;min-height:340px;padding:27px;background:var(--sheet);color:var(--ink);border:1px solid var(--rule);border-radius:5px 18px 18px 5px;box-shadow:-3px 3px 0 var(--rule-2),0 28px 55px #172d4220;transform-style:preserve-3d;backface-visibility:hidden;will-change:transform,opacity}.paper-header{display:flex;justify-content:space-between;font:10px var(--mono);letter-spacing:.06em;color:var(--ink-2);border-bottom:1px solid var(--rule);padding-bottom:19px}.paper-passage{font:20px/1.65 Georgia,serif;margin:25px 0}.paper-passage mark{background:#f2d984;color:#172d42;box-decoration-break:clone;-webkit-box-decoration-break:clone}.paper-answer{display:flex;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--rule);border-radius:6px;font-size:11px;margin:10px 0}.paper-answer>span{border:1px solid currentColor;border-radius:50%;height:21px;width:21px;display:grid;place-items:center}.paper-answer.correct{background:var(--blue-soft);border-color:var(--cobalt);color:var(--cobalt)}.paper-answer b{margin-left:auto}.margin-note{display:block;margin:15px 0 -5px;text-align:right;font-size:23px;color:var(--cobalt)}.page-practice{z-index:3;transform:translate3d(calc(var(--spread) * -270px),calc(var(--spread) * -65px),calc(var(--spread) * -140px)) rotateY(calc(-12deg - var(--spread) * 30deg)) rotateZ(calc(-7deg - var(--spread) * 18deg));opacity:calc(1 - var(--spread) * .83)}.page-review{z-index:2;transform:translate3d(calc(28px - var(--spread) * 28px - var(--turn) * 240px),calc(18px - var(--spread) * 18px - var(--turn) * 60px),calc(-40px + var(--spread) * 40px - var(--turn) * 140px)) rotateY(calc(8deg - var(--turn) * 30deg)) rotateZ(calc(7deg - var(--turn) * 26deg));opacity:calc(1 - var(--turn) * .83);text-align:center}.review-check{height:59px;width:59px;border-radius:50%;color:var(--cobalt);background:var(--blue-soft);display:grid;place-items:center;font-size:30px;margin:20px auto 12px}.page-review h3{font:600 30px var(--hand);margin:5px 0}.page-review p{font-size:13px;color:var(--ink-2);line-height:1.7;margin:6px 0 14px}.time-slip{display:flex;align-items:center;justify-content:space-between;background:var(--paper);padding:12px 16px;border-radius:8px}.time-slip span{font:9px var(--mono)}.time-slip b{font:22px var(--mono)}.page-review small{font-size:9px;color:var(--ink-2)}.page-test{z-index:1;transform:translate3d(calc(50px - var(--turn) * 50px),calc(40px - var(--turn) * 40px),calc(-80px + var(--turn) * 80px)) rotateY(calc(15deg - var(--turn) * 20deg)) rotateZ(calc(15deg - var(--turn) * 12deg));background:#edca76;color:#173047;border-color:#c7a453}.page-test .paper-header{border-color:#b69c6680;color:#34465c}.page-test h3{font:700 29px/1.12 var(--sans);letter-spacing:-.04em;margin:25px 0}.page-test .hand{font-size:36px}.module-track{display:grid;gap:5px;font:10px var(--mono)}.module-track>span{padding:14px;border:1px solid #b2955b;border-radius:8px;display:flex;justify-content:space-between}.module-track i{text-align:center;font-size:17px}.test-mini-footer{display:flex;justify-content:space-between;font-size:9px;margin-top:25px}.story-scroll{position:absolute;bottom:4px;right:12%;font-size:24px;color:var(--ink-2);transform:rotate(-5deg)}
.notebook-home .demo-layout{gap:90px}.demo-note{display:block;font-size:27px;color:var(--cobalt);transform:rotate(-5deg);margin-top:35px}.sample-card{box-shadow:0 12px 0 -5px var(--rule-2),0 25px 40px #152d420a;border-radius:16px}.sample-card h3{font-family:var(--sans);font-weight:600;line-height:1.5;font-size:20px}.sample-top{margin-bottom:21px}.sample-answers button{border-radius:8px}.sample-answers button[aria-pressed=true]{background:var(--blue-soft);border-color:var(--cobalt);color:var(--cobalt)}.sample-tabs button[aria-selected=true]{background:var(--ink);color:var(--paper)}.target-section{background:var(--blue-soft);padding:80px 0;margin-block:25px 30px}.notebook-home .score-lab{gap:100px;padding-block:0}.score-console{background:var(--sheet);box-shadow:0 15px 50px #152d4210;border:1px solid var(--rule);padding:30px;border-radius:18px}.score-total output{font:700 75px/1 var(--sans);letter-spacing:-.07em;color:var(--cobalt)}.score-total{border-color:var(--rule)}.score-console input{accent-color:var(--cobalt)}.score-console>p{font-size:12px}.target-section small{font-size:12px;color:var(--ink-2)}.notebook-price{padding-block:85px;display:grid;grid-template-columns:1.3fr 1fr;gap:80px;align-items:center;border-bottom:1px solid var(--rule)}.notebook-price h2{margin-bottom:24px}.notebook-price p{font-size:15px;line-height:1.7;color:var(--ink-2)}.pass-features{list-style:none;margin:25px 0 0;padding:0;display:grid;gap:14px;font-size:14px}.pass-features li::before{content:'✓';color:var(--cobalt);margin-right:13px;font-weight:800}.pass-price{padding-left:50px;border-left:1px solid var(--rule)}.pass-price>span{font:11px var(--mono);letter-spacing:.09em}.pass-price strong{display:block;font:700 90px/1.2 var(--sans);letter-spacing:-.07em;margin-top:5px}.pass-price .btn{margin:13px 0 22px}.pass-price small{font-size:11px;line-height:1.7;display:block;color:var(--ink-2)}.compact-faq{padding-block:65px 90px;display:grid;grid-template-columns:1fr 1.25fr;gap:70px}.notebook-home .compact-faq h2{font-size:30px;letter-spacing:-.035em;margin:5px 0}.compact-faq summary{font-size:15px}.compact-faq details p{font-size:14px}.score-trail{padding:9px 14px;bottom:20px;font-size:11px}.score-trail small{font-size:8px}.score-trail b{font-size:19px}.score-trail .trail-star{font-size:24px}.notebook-home{overflow-x:clip}html[data-theme=dark] .notebook-home .btn-primary{color:#15243f;box-shadow:0 4px 0 #536ea9}html[data-theme=dark] .score-trail{background:#232b37;color:var(--ink);border-color:var(--rule)}
/* Small, factual company pages. */
.company-simple{max-width:950px;padding-block:80px 100px}.company-simple h1{font:700 clamp(40px,6vw,70px)/1.1 var(--sans);letter-spacing:-.055em;margin:25px 0 35px}.company-simple h1 .hand{font-size:1.2em;color:var(--cobalt)}.company-simple .about-intro{font-size:20px;line-height:1.8;max-width:650px;color:var(--ink-2)}.about-definition{display:grid;grid-template-columns:200px 1fr;gap:40px;border-block:1px solid var(--rule);padding:40px 0;margin:45px 0}.about-definition h2{font:50px var(--hand);margin:0}.about-definition p{font-size:16px;line-height:1.9;margin:0;max-width:560px;color:var(--ink-2)}.founder-credit{font-size:13px;color:var(--ink-2);margin:35px 0}.founder-credit b{font-weight:600;color:var(--ink)}.company-simple .contact-pair{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin:40px 0}.contact-pair article{border:1px solid var(--rule);background:var(--sheet);border-radius:14px;padding:28px}.contact-pair h2{font:700 24px var(--sans);margin:0 0 22px;letter-spacing:-.03em}.contact-pair a{font-size:22px;color:var(--cobalt);text-decoration:none;font-weight:600}.contact-pair p{font-size:13px;color:var(--ink-2);line-height:1.7;margin-bottom:0}.contact-tip{border-left:3px solid var(--gold);padding:4px 0 4px 20px;font-size:14px;line-height:1.8;color:var(--ink-2);max-width:620px}
@media(max-width:1000px){.notebook-hero{gap:0;min-height:650px}.notebook-copy h1{font-size:62px}.notebook-scene{transform:scale(.88);transform-origin:center}.hero-intro{font-size:15px}.hero-cta .btn{font-size:13px;padding:16px}.story-sticky{gap:20px}.paper-stage{transform:scale(.85);transform-origin:center}.story-copy h2{font-size:41px}.notebook-home .demo-layout,.notebook-home .score-lab{gap:45px}.notebook-price{gap:30px}.proof-ribbon{flex-wrap:wrap;justify-content:center;font-size:11px}.proof-ribbon b{font-size:15px}}
@media(max-width:700px){.nav-in{height:70px}.notebook-hero{grid-template-columns:1fr;gap:0;padding-top:40px;padding-bottom:35px}.notebook-copy h1{font-size:56px;max-width:390px;margin-top:22px}.notebook-copy .eyebrow{font-size:9px}.notebook-scene{height:440px;transform:scale(.8);margin:-15px -20px 25px;transform-origin:center}.notebook-object{top:35px}.scene-note{top:-15px;left:35%;font-size:25px}.scene-caption{bottom:-47px}.pencil{bottom:15px;left:10%}.notebook-shadow{bottom:-22px}.hero-intro{font-size:15px}.notebook-copy .hero-cta{gap:20px}.notebook-copy .hero-note{font-size:12px}.proof-ribbon{display:grid;gap:12px;justify-content:start;padding-block:22px}.proof-ribbon>span{font-size:12px}.scroll-story{height:auto;padding-block:65px}.story-sticky{position:relative;top:auto;min-height:0;height:auto;display:block}.story-copy h2{font-size:38px}.story-step{opacity:1;padding:14px 0 15px 14px}.paper-stage{height:440px;margin-top:10px;transform:scale(.8);transform-origin:50% 50%}.floating-page{top:40px}.story-scroll{display:none}.stage-ring{width:360px;height:360px}.notebook-home .section-space{padding-block:45px 65px}.notebook-home .demo-layout,.notebook-home .score-lab{grid-template-columns:1fr;gap:35px}.notebook-home h2{font-size:36px}.demo-note{font-size:23px;margin-top:22px}.sample-card{padding:23px}.target-section{padding-block:50px;margin:0}.score-console{padding:24px}.notebook-price{grid-template-columns:1fr;padding-block:55px;gap:35px}.pass-price{padding:30px 0 0;border-left:0;border-top:1px solid var(--rule)}.pass-price strong{font-size:80px}.compact-faq{grid-template-columns:1fr;gap:23px;padding-block:45px 60px}.company-simple{padding-block:45px 70px}.company-simple .about-intro{font-size:17px}.about-definition{grid-template-columns:1fr;gap:12px;padding:26px 0}.company-simple .contact-pair{grid-template-columns:1fr}.company-simple h1{font-size:43px}.score-trail{left:auto;right:12px;bottom:12px;transform:scale(.85);transform-origin:right bottom}.foot{padding-bottom:75px}.footer-top{gap:28px}}
@media(prefers-reduced-motion:reduce){.scroll-story{height:auto;padding-block:60px}.story-sticky{position:relative;top:auto;height:auto;min-height:600px}.story-step{opacity:1}.paper-stage{--spread:0!important;--turn:0!important}.notebook-object{transform:rotateY(-15deg) rotateZ(7deg)!important;transition:none}.floating-page{will-change:auto}.notebook-home .btn-primary:hover{transform:none}}

.errata-finale{position:relative;isolation:isolate;overflow:hidden;background:#172e45;color:#faf4df;padding:70px 0 0;border-radius:28px 28px 0 0;margin-top:20px}.finale-content{text-align:center;position:relative;z-index:1}.finale-content>img{width:68px;height:68px;object-fit:cover;border-radius:50%;margin-bottom:7px}.finale-content>.hand{font-size:32px;color:#e9c98d;transform:rotate(-3deg);margin:14px 0 24px}.notebook-home .finale-content h2{font-size:clamp(35px,4.6vw,62px);color:#faf4df;letter-spacing:-.05em;margin:0 0 30px;line-height:1.1}.finale-content .btn-gold{margin-bottom:27px;background:#edca76;color:#182e43;box-shadow:0 4px 0 #9c7534}.finale-signoff{display:block;font:9px var(--mono);color:#bdc7d3;letter-spacing:.12em}.finale-word{font:750 clamp(90px,20.7vw,310px)/.93 var(--sans);letter-spacing:-.085em;color:#30475e;text-align:center;margin:52px 0 -16px;white-space:nowrap;position:relative;z-index:0;user-select:none}.finale-word>span{font-weight:400;color:#60727f;font-size:.55em;vertical-align:15%;letter-spacing:-.09em}.finale-orbit{position:absolute;left:calc(50% - 465px);top:40px;width:930px;height:500px;border:1px solid #bdc7d317;border-radius:50%;transform:rotate(-22deg);pointer-events:none}.finale-orbit::after{content:'';position:absolute;inset:38px;border:1px dashed #bdc7d317;border-radius:50%}.notebook-home .foot{margin-top:0;background:#172e45;color:#faf4df;border:0;padding-top:35px;--ink:#faf4df;--ink-2:#bdc7d3;--rule:#41546a;--rule-2:#41546a}.notebook-home .foot .footer-top{padding-bottom:25px}.notebook-home .foot .brand{font-family:var(--sans);font-size:25px}.notebook-home .foot .footer-top>div>p{color:#bdc7d3}.notebook-home .foot a{color:#e3e9f1}.notebook-home .foot .footer-bottom{color:#bdc7d3;border-color:#41546a}.notebook-home .foot .footer-toplink{color:#edca76}
@media(max-width:700px){.errata-finale{padding-top:45px;margin-top:0;border-radius:18px 18px 0 0}.finale-content>.hand{font-size:27px}.finale-content>img{width:58px;height:58px}.notebook-home .finale-content h2{font-size:36px}.finale-word{font-size:21vw;margin:40px 0 0}.finale-signoff{font-size:8px;letter-spacing:.08em}.finale-orbit{width:560px;height:350px;left:calc(50% - 280px)}}

/* The pages keep their tilt, but stack by z-index instead of real 3D depth.
   In 3D the tilted pages crossed each other and a strip of the page behind
   cut through the front one. */
.paper-stage,.floating-page{transform-style:flat}
/* ...and each page drops behind the others as it turns away, so a faded page never sits over the next one */
.page-practice{z-index:calc(3 - var(--spread) * 3)}
.page-review{z-index:calc(2 - var(--turn) * 2)}