/* Experience layer: interactive landing page, product tour, pricing and results view.
   Loaded after course.css. Every colour derives from the site's primary (--green) and accent
   (--orange), so a generated site needs no stylesheet edits. No inline styles anywhere: the
   content security policy allows only this file and CSSOM changes made by experience.js. */
:root{
  --x-deep:#10261c;--x-deeper:#08140f;--x-tint:#eef3ee;
  --x-shadow:0 40px 80px -40px rgb(0 0 0/.5),0 2px 8px rgb(0 0 0/.08);
  --x-ease:cubic-bezier(.2,.8,.2,1);
}
@supports (color:color-mix(in srgb,#000,#fff)){
  :root{
    --x-deep:color-mix(in srgb,var(--green) 78%,#000);
    --x-deeper:color-mix(in srgb,var(--green) 38%,#000);
    --x-tint:color-mix(in srgb,var(--green) 8%,#fff);
  }
}
@property --x-angle{syntax:'<angle>';initial-value:0deg;inherits:false}

/* Page chrome */
.site-header{position:sticky;top:0;z-index:50;background:rgb(244 241 233/.84);backdrop-filter:saturate(1.5) blur(14px);-webkit-backdrop-filter:saturate(1.5) blur(14px)}
.home-page .site-header{background:var(--x-deep);border-bottom-color:rgb(255 255 255/.1);backdrop-filter:none;-webkit-backdrop-filter:none}
.home-page .site-header .brand,.home-page .site-header nav a{color:#fff}
.home-page .site-header nav a:hover{color:var(--orange)}
.home-page .site-header .nav-try{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.home-page .site-header .nav-try:hover{background:var(--orange-hover);color:var(--ink)}
.x-scroll{position:fixed;top:0;left:0;z-index:60;width:100%;height:3px;transform-origin:0 50%;transform:scaleX(var(--p,0));background:var(--orange);pointer-events:none}
.button{border-radius:12px;transition:background .18s,transform .18s var(--x-ease),box-shadow .18s}
.button.dark:hover{transform:translateY(-2px)}
.button.x-ghost{background:rgb(255 255 255/.08);color:#fff;border:1px solid rgb(255 255 255/.3);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.button.x-ghost:hover{background:rgb(255 255 255/.17);transform:translateY(-2px)}
.x-section-head{max-width:760px;margin-bottom:44px}
.x-section-head h2{text-wrap:balance}
.x-section-head p{margin-top:16px;font-size:18px;max-width:56ch}
.x-chevron{flex:none;width:10px;height:10px;border-right:2px solid var(--ink);border-bottom:2px solid var(--ink);transform:rotate(45deg);transition:transform .25s var(--x-ease);justify-self:end;margin-right:6px}
details[open]>summary .x-chevron{transform:rotate(225deg)}
.js .x-reveal{opacity:0;transform:translateY(26px)}
.js .x-reveal.is-in{opacity:1;transform:none;transition:opacity .7s var(--x-ease),transform .7s var(--x-ease)}
@keyframes x-rise{from{opacity:0;transform:translateY(12px)}}
@keyframes x-pop{50%{transform:scale(1.025)}}
@keyframes x-shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}

/* Hero */
.x-hero{position:relative;isolation:isolate;overflow:hidden;overflow:clip;color:#fff;background:linear-gradient(155deg,var(--x-deep),var(--x-deeper));padding-block:clamp(56px,7vw,96px) clamp(64px,8vw,112px)}
.x-hero::before{content:"";position:absolute;inset:0;z-index:-1;background-image:linear-gradient(rgb(255 255 255/.05) 1px,transparent 1px),linear-gradient(90deg,rgb(255 255 255/.05) 1px,transparent 1px);background-size:56px 56px;-webkit-mask-image:radial-gradient(ellipse at 72% 18%,#000 0,transparent 72%);mask-image:radial-gradient(ellipse at 72% 18%,#000 0,transparent 72%)}
.x-hero-bg span{position:absolute;z-index:-1;border-radius:50%;filter:blur(80px);animation:x-drift 18s ease-in-out infinite alternate}
.x-hero-bg span:nth-child(1){width:520px;height:520px;right:-140px;top:-220px;background:var(--orange);opacity:.5}
.x-hero-bg span:nth-child(2){width:460px;height:460px;left:-180px;bottom:-240px;background:var(--green);opacity:.85;animation-duration:24s}
.x-hero-bg span:nth-child(3){width:280px;height:280px;left:44%;top:34%;background:#fff;opacity:.06;animation-duration:30s}
@keyframes x-drift{to{transform:translate3d(46px,32px,0) scale(1.1)}}
.x-hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:clamp(32px,5vw,76px);align-items:center}
.x-hero h1{color:#fff;font-size:clamp(40px,5.2vw,72px);font-weight:600;letter-spacing:-.04em;line-height:1.03;text-wrap:balance}
.x-eyebrow{color:rgb(255 255 255/.72);margin-bottom:22px}
.x-hero-sub{color:rgb(255 255 255/.8);font-size:clamp(17px,1.45vw,20px);line-height:1.6;margin-top:22px;max-width:54ch}
.x-hero .button.primary{box-shadow:0 16px 34px -14px var(--orange)}
.x-trust{list-style:none;display:flex;flex-wrap:wrap;gap:10px 22px;padding:0;margin:28px 0 0;font-size:13px;color:rgb(255 255 255/.76)}
.x-trust li::before{content:"✓";margin-right:8px;color:var(--orange);font-weight:700}

/* Live question */
.x-demo{position:relative;background:var(--white);color:var(--ink);border-radius:24px;padding:clamp(20px,2.2vw,28px);box-shadow:var(--x-shadow);transform:perspective(1200px) rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg));transition:transform .3s var(--x-ease)}
/* A glow sits behind a card: the wrapper isolates it so it never paints over the card itself. */
.x-glow{position:relative;isolation:isolate}
.x-glow::before{content:"";position:absolute;inset:-2px;z-index:-1;border-radius:26px;background:linear-gradient(135deg,var(--orange),transparent 38%,transparent 62%,var(--green));filter:blur(24px);opacity:.8}
.x-glow-spin::before{background:conic-gradient(from var(--x-angle),var(--orange),transparent 28%,var(--green) 58%,transparent 82%,var(--orange));filter:blur(18px);animation:x-spin 9s linear infinite}
.x-demo-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;font-size:12px;font-weight:600;color:var(--muted)}
.x-live{display:inline-flex;align-items:center;gap:9px;color:var(--ink)}
.x-live i{width:8px;height:8px;border-radius:50%;background:var(--orange);animation:x-pulse 1.8s infinite}
@keyframes x-pulse{0%{box-shadow:0 0 0 0 var(--orange)}70%{box-shadow:0 0 0 9px transparent}100%{box-shadow:0 0 0 0 transparent}}
.x-demo-prompt{color:var(--ink);font-size:clamp(19px,1.7vw,23px);font-weight:600;letter-spacing:-.02em;line-height:1.35}
.x-demo-options{display:grid;gap:10px;margin-top:18px}
.x-demo-option{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--white);color:var(--ink);border:1.5px solid var(--line);border-radius:14px;padding:13px 15px;font-size:15px;line-height:1.4;transition:transform .16s var(--x-ease),border-color .16s,background .16s,box-shadow .16s}
.x-demo-option:hover:not(:disabled){transform:translateY(-2px);border-color:var(--ink);box-shadow:0 12px 22px -16px rgb(0 0 0/.55)}
.x-demo-option:disabled{cursor:default}
.x-demo-letter{flex:none;display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--x-tint);font-size:13px;font-weight:700}
.x-demo-option.is-right{border-color:var(--green);background:var(--x-tint);animation:x-pop .5s var(--x-ease)}
.x-demo-option.is-right .x-demo-letter{background:var(--green);color:#fff}
.x-demo-option.is-wrong{border-color:#b1432b;background:#fcece4;animation:x-shake .35s}
.x-demo-option.is-wrong .x-demo-letter{background:#b1432b;color:#fff}
.x-demo-feedback{margin-top:16px;padding:16px 18px;border-radius:14px;background:var(--x-tint);font-size:14px;animation:x-rise .4s var(--x-ease)}
.x-demo-feedback>strong{display:block;margin-bottom:8px;font-size:16px;color:var(--ink)}
.x-demo-feedback .solution-steps{margin-block:8px 0}
.x-demo-feedback .button{margin-top:16px;padding:13px 18px;font-size:13px}
.x-demo-foot{margin-top:14px;font-size:12px}

/* Numbers */
.x-stats{background:var(--ink);color:#fff}
.x-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.x-stats-grid>div{padding:30px 28px;border-left:1px solid rgb(255 255 255/.12)}
.x-stats-grid>div:first-child{border-left:0;padding-left:0}
.x-stats strong{display:block;font-size:clamp(36px,4vw,52px);font-weight:600;letter-spacing:-.04em;line-height:1;font-variant-numeric:tabular-nums}
.x-stats span{display:block;margin-top:9px;max-width:26ch;font-size:13px;color:rgb(255 255 255/.66)}

/* Why */
.x-why,.x-features,.x-curriculum,.x-faq{padding-block:clamp(64px,8vw,112px)}
.x-why-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(28px,5vw,80px);align-items:start}
.x-why-grid h2{text-wrap:balance}
.x-why-grid .large-copy{font-size:19px;line-height:1.65;margin-bottom:26px}
@keyframes x-fill{to{width:100%}}
.x-ring-track{fill:none;stroke:var(--line);stroke-width:9}
@keyframes x-count{to{stroke-dashoffset:70}}
@keyframes x-dot{from{background:var(--line)}to{background:var(--green)}}

/* What you get */
.x-feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.x-feature{padding:26px;background:var(--white);border:1px solid var(--line);border-radius:20px;transition:transform .25s var(--x-ease),box-shadow .25s,opacity .7s var(--x-ease)}
.x-feature:hover{transform:translateY(-4px);box-shadow:0 30px 50px -36px rgb(0 0 0/.5)}
.x-feature:nth-child(3n+2){transition-delay:.08s}.x-feature:nth-child(3n){transition-delay:.16s}
.x-feature svg{width:40px;height:40px;padding:9px;border-radius:12px;background:var(--x-tint);fill:none;stroke:var(--green);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.x-feature h3{margin-top:18px;font-size:19px;font-weight:600;letter-spacing:-.02em}
.x-feature p{margin-top:8px;font-size:15px}

/* Curriculum and questions */
.x-lessons,.x-faq-list{border-top:1px solid var(--line)}
.x-lesson,.x-faq-list details{border-bottom:1px solid var(--line)}
.x-lesson summary{display:grid;grid-template-columns:44px minmax(0,1fr) auto 24px;gap:16px;align-items:center;padding:20px 4px;cursor:pointer;list-style:none;font-size:18px;font-weight:500;letter-spacing:-.01em}
.x-lesson summary::-webkit-details-marker,.x-faq-list summary::-webkit-details-marker{display:none}
.x-lesson summary:hover .x-lesson-title,.x-faq-list summary:hover{color:var(--orange-hover)}
.x-lesson-num{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}
.x-lesson-meta{font-size:12px;font-weight:400;color:var(--muted);white-space:nowrap}
.x-lesson-meta:empty{display:none}
.x-lesson summary .x-chevron{grid-column:4}
.x-lesson-body{max-width:70ch;padding:0 4px 22px 64px}
.x-lesson-body p+p{margin-top:8px}
.x-faq-list{max-width:860px}
.x-faq-list summary{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:20px 4px;cursor:pointer;list-style:none;font-size:18px;font-weight:500;letter-spacing:-.01em}
.x-faq-list p{max-width:68ch;padding:0 4px 22px}

/* Pricing */
.x-pricing{color:#fff;background:linear-gradient(155deg,var(--x-deep),var(--x-deeper));padding-block:clamp(64px,8vw,112px)}
.x-pricing-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,440px);gap:clamp(32px,5vw,76px);align-items:center;isolation:isolate}
.x-pricing h2{color:#fff;text-wrap:balance}
.x-pricing .section-label{color:rgb(255 255 255/.6)}
.x-pricing-copy p{margin-top:18px;font-size:17px;color:rgb(255 255 255/.78)}
.x-pricing-copy .small-copy{font-size:13px;color:rgb(255 255 255/.6)}
.x-price-card{position:relative;padding:32px;border:0;border-radius:24px;color:var(--ink);box-shadow:var(--x-shadow)}
@keyframes x-spin{to{--x-angle:360deg}}
.x-price-top{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px}
.x-price-amount{font-size:clamp(44px,5vw,60px);font-weight:600;letter-spacing:-.04em;line-height:1}
.x-price-top span:last-child{font-size:14px;color:var(--muted)}
.x-included{list-style:none;display:grid;gap:11px;padding:0;margin:22px 0 24px;font-size:15px}
.x-included li{display:flex;align-items:flex-start;gap:12px}
.x-included li::before{content:"";flex:none;width:20px;height:20px;margin-top:1px;border-radius:50%;background:var(--green) center/11px no-repeat url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 6.5 5 9l4.5-5.5' fill='none' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")}
.x-price-card .small-copy{margin-top:14px}

/* Closing band and sticky bar */
.x-final{background:var(--x-tint);padding-block:clamp(56px,7vw,96px)}
.x-final-inner{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:32px}
.x-final h2{max-width:20ch;text-wrap:balance}
.x-final .hero-actions{margin-top:0}
.x-sticky{position:fixed;left:50%;bottom:18px;z-index:40;display:flex;align-items:center;gap:22px;padding:10px 10px 10px 22px;border-radius:18px;background:rgb(25 28 25/.94);color:#fff;box-shadow:0 24px 50px -20px rgb(0 0 0/.6);transform:translateX(-50%);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);animation:x-rise-centre .35s var(--x-ease)}
@keyframes x-rise-centre{from{opacity:0;transform:translate(-50%,14px)}}
.x-sticky[hidden]{display:none}
.x-sticky strong{display:block;font-size:14px;font-weight:600}
.x-sticky div span{font-size:12px;color:rgb(255 255 255/.72)}
.x-sticky .button{padding:12px 16px;font-size:13px;white-space:nowrap}
.x-sticky .button span{font-size:18px}

/* Practice and results */
.practice-page .quiz-stage{padding:clamp(24px,3.4vw,44px);border-radius:22px;box-shadow:0 40px 70px -50px rgb(0 0 0/.5)}
.quiz-option{border-width:1.5px;border-radius:14px;transition:transform .16s var(--x-ease),border-color .16s,background .16s,box-shadow .16s}
.quiz-option:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 12px 22px -16px rgb(0 0 0/.5)}
.quiz-option.correct{animation:x-pop .5s var(--x-ease)}
.quiz-option.wrong{animation:x-shake .35s}
.answer-feedback{border-radius:14px;animation:x-rise .4s var(--x-ease)}
.progress-track{height:6px;border-radius:99px}
#sample-progress-bar{height:100%;border-radius:inherit;background:var(--orange);transition:width .5s var(--x-ease)}
.x-result{display:grid;grid-template-columns:auto minmax(0,1fr);gap:28px;align-items:center;margin-block:22px}
.x-result h2{font-size:clamp(24px,2.6vw,34px);line-height:1.15}
.x-result p{margin-top:12px}
.quiz-stage [tabindex="-1"]:focus{outline:none}
.x-ring{position:relative;width:150px;height:150px}
.x-ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.x-ring-value{fill:none;stroke:var(--green);stroke-width:9;stroke-linecap:round;stroke-dasharray:100;stroke-dashoffset:100;transition:stroke-dashoffset 1.2s var(--x-ease)}
.x-ring-label{position:absolute;inset:0;display:grid;place-content:center;text-align:center}
.x-ring-label strong{font-size:44px;font-weight:600;letter-spacing:-.04em;line-height:1}
.x-ring-label span{font-size:13px;color:var(--muted)}
.x-topics{display:grid;gap:14px;margin-block:8px 22px}
.x-topic{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:7px 16px;font-size:14px}
.x-topic span{color:var(--ink)}
.x-topic em{font-style:normal;color:var(--muted);font-variant-numeric:tabular-nums}
.x-topic i{grid-column:1/-1;height:6px;overflow:hidden;border-radius:99px;background:var(--line)}
.x-topic i b{display:block;width:0;height:100%;border-radius:inherit;background:var(--green);transition:width .9s var(--x-ease)}

/* State page: sourced facts under the hero, and the index of state pages above the footer */
.x-region{padding-top:clamp(48px,6vw,80px)}
.x-region .x-section-head{margin-bottom:24px}
.x-region-facts{width:100%;border-collapse:collapse;border-top:1px solid var(--line);font-size:15px}
.x-region-facts th,.x-region-facts td{padding:14px 20px 14px 0;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.x-region-facts thead th{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.x-region-facts tbody th{font-weight:500;color:var(--muted)}
.x-region-facts td:nth-child(2){font-weight:600;color:var(--ink)}
.x-region-facts small{display:block;margin-top:2px;font-size:12px;color:var(--muted)}
.x-region-links{display:flex;flex-wrap:wrap;gap:6px 32px;margin-top:20px}
.x-region-note{margin-top:18px;max-width:72ch;font-size:15px}
.x-region-index{display:flex;flex-wrap:wrap;align-items:center;gap:0 4px;padding-block:18px;font-size:14px}
.x-region-index span{margin-right:10px;font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.x-region-index a{display:inline-flex;align-items:center;min-height:44px;padding-inline:10px}
.x-region-index a[aria-current]{font-weight:600;text-decoration:none}

/* Notices before the questions, and the corrections page */
.x-correction-list{list-style:none;margin:24px 0 0;padding:0;border-top:1px solid var(--line)}
.x-correction-list li{padding:16px 0;border-bottom:1px solid var(--line)}
.x-correction-list span{font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--muted)}
.x-correction-list p{margin-top:4px}

/* Tap targets: every link and button a visitor is meant to tap is at least 44px high on any
   screen. A link inside running text keeps its line: an inline box grows by its padding without
   moving the lines around it, and sits above them so the whole padded box takes the tap. A text
   button gives the padding back as a negative margin for the same reason. */
.button,.text-link,.brand,.sound-toggle,.b-chip,.b-action{min-height:44px}
.site-header nav a{display:inline-flex;align-items:center;min-height:44px}
@media(max-width:820px){.site-header nav a.nav-curriculum{display:none}}
.site-header nav a{white-space:nowrap}
@media(max-width:430px){.site-header{gap:10px}.site-header .brand{font-size:17px;white-space:nowrap}.site-header nav{gap:8px}}
.nav-try-short{display:none}@media(max-width:430px){.nav-try-word{display:none}.nav-try-short{display:inline}}
.site-header nav a:not(.nav-try){gap:.3em}
:where(main,.site-footer) :where(p,li,span,small,output,td,dd)>a:where(:not([class])){position:relative;z-index:1;padding-block:calc((46px - 1.3em)/2)}
.text-button{padding-block:15px;margin-top:5px;margin-bottom:-15px}
.b-status .text-button,.b-ask .text-button,.e-saved .text-button{margin-block:-15px}
.study-device-note .text-button{margin-top:-3px}
.signout-form{display:inline-flex;margin:0}.nav-out{background:none;border:0;padding:12px 0;font:inherit;font-size:14px;color:var(--muted,#5b5f58);text-decoration:underline;text-underline-offset:3px;cursor:pointer}.nav-out:hover{color:inherit}
@media(max-width:420px){.study-page .site-header nav{gap:14px}}
.footer-bottom>div{align-items:center;flex-wrap:wrap;gap:0;margin-left:-9px}
.footer-bottom>div>a{display:inline-flex;align-items:center;min-height:44px;padding-inline:9px}
.footer-bottom>div>span{padding-inline:9px}
.report-problem{margin-top:10px;font-size:13px}
.report-problem a{display:inline-flex;align-items:center;min-height:44px;padding-block:0;color:var(--muted)}
@media(max-width:820px){.practice-sidebar .text-button{margin-top:-15px}}

@media(max-width:980px){
  .x-hero-grid,.x-why-grid,.x-pricing-grid{grid-template-columns:minmax(0,1fr)}
  .x-feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .x-demo{transform:none}
}
@media(max-width:640px){
  .x-feature-grid{grid-template-columns:minmax(0,1fr)}
  .x-stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .x-stats-grid>div{padding:22px 16px}
  .x-stats-grid>div:nth-child(odd){border-left:0;padding-left:0}
  .x-lesson summary{grid-template-columns:32px minmax(0,1fr) 24px;font-size:16px}
  .x-lesson-meta{grid-column:2;grid-row:2}
  .x-lesson summary .x-chevron{grid-column:3;grid-row:1}
  .x-lesson-body{padding-left:52px}
  .x-region-facts thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
  .x-region-facts tr{display:grid;gap:3px;padding:14px 0;border-bottom:1px solid var(--line)}
  .x-region-facts th,.x-region-facts td{padding:0;border:0}.x-result{grid-template-columns:minmax(0,1fr);justify-items:start}
  .x-sticky{left:12px;right:12px;bottom:12px;justify-content:space-between;gap:12px;padding-left:16px;transform:none;animation-name:x-rise}
  .x-hero .hero-actions .button{width:100%}
  .x-hero-bg span:nth-child(1){width:320px;height:320px;right:-140px;top:-170px;opacity:.38}
}
@media(prefers-reduced-motion:reduce){
  .x-hero-bg span,.x-live i,.x-glow-spin::before,.x-sticky,.x-demo-feedback,.answer-feedback,.quiz-option,.x-demo-option{animation:none!important}
  .js .x-reveal{opacity:1;transform:none}
  .x-demo{transform:none}
  .x-ring-value,.x-topic i b,#sample-progress-bar{transition:none}
}

.x-source{margin-top:10px;font-size:13px!important;color:var(--muted)}