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#242c312e;--duration-carousel:.45s;--carousel-caption-height:5rem;--sample-caption-height:3em;--size-body:clamp(1.0625rem, 1rem + .15vw, 1.125rem);--size-lead:clamp(1.1875rem, 1.1rem + .2vw, 1.3125rem);--size-small:.875rem;--size-label:.8125rem;--size-h1:clamp(2.5rem, 5vw, 4rem);--size-h2:clamp(1.875rem, 3.5vw, 2.75rem);--size-h3:clamp(1.3125rem, 2vw, 1.5rem);--size-price:clamp(2.5rem, 4vw, 3.5rem);--radius:.375rem;--radius-panel:1rem;--radius-circle:50%;--shadow-card:0 1px 2px #242c310f, 0 8px 24px #242c3114;--shadow-hover:0 2px 4px #242c3114, 0 12px 32px #242c311f;--measure:65ch;--content-width:75rem;--control-size:3rem;--tick-size:1.25rem;--duration-button:.15s;--duration-reveal:.3s;--duration-hero:.4s;--delay-hero:80ms;--ease:cubic-bezier(.2,.8,.2,1);--reveal-distance:.75rem}*{box-sizing:border-box}html{scrollbar-gutter:stable;scroll-padding-bottom:calc(var(--purchase-bar-height,0px) + var(--space-4))}body{font-size:var(--size-body);margin:0;line-height:1.6}h1,h2,h3,p,figure,blockquote{margin:0}h1,h2,h3{font-family:var(--font-heading);overflow-wrap:anywhere;font-weight:700}h1{font-size:var(--size-h1);letter-spacing:-.035em;line-height:1.02}h2{font-size:var(--size-h2);letter-spacing:-.035em;line-height:1.1}h3{font-size:var(--size-h3);letter-spacing:-.025em;line-height:1.2}p{max-width:var(--measure);overflow-wrap:anywhere}p+p{margin-top:var(--space-4)}img{max-width:100%;height:auto;display:block}a{color:var(--color-rust);text-underline-offset:3px}button{font:inherit;cursor:pointer;color:inherit}a,button{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--color-ink);outline-offset:2px;border-radius:var(--radius)}main:focus{outline:none}.container{width:calc(100% - 2 * var(--gutter-phone));max-width:var(--content-width);margin-inline:auto}.section-space{padding-block:var(--space-16)}.section-heading{margin-bottom:var(--space-8)}.section-heading 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.button{padding-inline:var(--space-4)}.hero{gap:var(--space-8);padding-block:var(--space-8) var(--space-12);display:grid}.hero-copy{min-width:0}.hero-lead{margin-top:var(--space-6);max-width:40ch;color:var(--color-muted);font-size:var(--size-lead);line-height:1.5}.hero-purchase{margin-top:var(--space-6)}.hero-action{align-items:center;gap:var(--space-6);margin-bottom:var(--space-3);flex-wrap:wrap;display:flex}.hero-total>strong{font-family:var(--font-heading);font-size:var(--size-price);font-variant-numeric:tabular-nums;line-height:1.1}.edition-selector{margin-top:var(--space-6)}.edition-options{gap:var(--space-2);margin-top:var(--space-2);max-width:var(--edition-selector-width);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.edition-options button{min-width:0;min-height:var(--control-size);padding:var(--space-3) var(--space-2);border:1px solid var(--color-line);border-radius:var(--radius);background:var(--color-paper);overflow-wrap:anywhere;justify-content:center;align-items:center;font-size:1rem;font-weight:700;line-height:1.4;display:flex}.edition-options button[aria-pressed=true]{border-color:var(--color-ink);background:var(--color-ink);color:var(--color-paper)}.edition-name{color:var(--color-muted);font-size:var(--size-small);margin-bottom:var(--space-2)}.edition-preview-note{border-left:3px solid var(--color-orange);padding-left:var(--space-3);margin-top:var(--space-4)}.reserved-note{visibility:hidden}.stable-text{min-width:0;display:grid}.stable-text>span{grid-area:1/1}.stable-reserve{visibility:hidden;pointer-events:none}#edition-content{overflow-anchor:none}.hero-art{isolation:isolate;min-width:0;padding:var(--space-4) 0;position:relative}.hero-art img{width:100%;height:auto;max-height:var(--hero-book-height);object-fit:contain;position:relative}.hero-curve{z-index:-1;background:var(--color-cream);border-radius:65% 35% 35% 65%/60% 65% 35% 40%;position:absolute;inset:3% 0 0}.blueprint{z-index:-2;background-image:linear-gradient(#242c310a 1px,#0000 1px),linear-gradient(90deg,#242c310a 1px,#0000 1px);background-size:var(--space-8) var(--space-8);position:absolute;inset:0;-webkit-mask-image:radial-gradient(#000 40%,#0000 72%);mask-image:radial-gradient(#000 40%,#0000 72%)}.tick-list{gap:var(--space-3);margin:0;padding:0;list-style:none;display:grid}.tick-list li{align-items:flex-start;gap:var(--space-3);overflow-wrap:anywhere;min-width:0;display:flex}.tick-list .tick-icon{flex:0 0 var(--tick-size);width:var(--tick-size);height:var(--tick-size);margin-top:var(--space-1);border-radius:var(--radius-circle);background:var(--color-orange);color:var(--color-ink);font-size:var(--size-small);justify-content:center;align-items:center;font-weight:700;line-height:1;display:flex}.hero-trust{font-size:var(--size-lead);color:var(--color-ink);padding-top:var(--space-6);border-top:1px solid var(--color-line);font-weight:700;line-height:1.4}.problem{background:var(--color-stone);padding-block:var(--space-12)}.problem-layout{gap:var(--space-8);display:grid}.problem h2{font-size:clamp(1.5rem,2.5vw,2rem);line-height:1.2}.problem p{color:var(--color-muted);margin-top:var(--space-4)}.payment-example{justify-content:space-between;align-items:start;gap:var(--space-2);min-width:0;display:flex}.payment-example>div{text-align:center;flex-direction:column;flex:1;min-width:0;display:flex}.payment-example strong{font-family:var(--font-heading);overflow-wrap:anywhere;font-size:clamp(1.5rem,3vw,2rem);line-height:1.3}.payment-example div>span{font-size:var(--size-small);color:var(--color-muted);margin-top:var(--space-2);overflow-wrap:anywhere;line-height:1.5}.math-symbol{color:var(--color-muted);font-size:1.5rem;line-height:1.3}.payment-example>div:last-child strong{-webkit-text-decoration:underline var(--color-orange) 4px;text-decoration:underline var(--color-orange) 4px;text-underline-offset:var(--space-2)}.product-grid{gap:var(--space-12);display:grid}.product-card{min-width:0}.product-art{background:var(--color-stone);border-radius:var(--radius-panel);height:17rem;padding:var(--space-6);margin-bottom:var(--space-6);justify-content:center;align-items:center;display:flex}.guide-art img{object-fit:contain;width:auto;height:100%}.workbook-art img{object-fit:contain;width:100%;height:100%}.workbook-inspect{width:100%;height:100%;min-height:var(--control-size);background:0 0;border:0;flex-direction:column;align-items:center;padding:0;display:flex}.workbook-inspect img{flex:1;min-height:0}.workbook-inspect>span{min-height:var(--control-size);color:var(--color-rust);text-underline-offset:var(--space-1);align-items:center;font-weight:700;text-decoration:underline;display:flex}.workbook-concept{height:auto;min-height:17rem}.workbook-preview{width:100%;padding:var(--space-4);background:var(--color-paper);border:1px solid var(--color-line);border-radius:var(--radius);box-shadow:var(--shadow-card)}.workbook-preview h3{margin-top:var(--space-2);font-size:1.25rem}.workbook-preview table{table-layout:fixed;border-collapse:collapse;width:100%;margin-block:var(--space-4);font-size:var(--size-small)}.workbook-preview th,.workbook-preview td{padding:var(--space-2) var(--space-1);text-align:right;border-bottom:1px solid var(--color-line);overflow-wrap:anywhere}.workbook-preview th{background:var(--color-cream)}.workbook-preview th:first-child,.workbook-preview td:first-child{text-align:left}.workbook-files{gap:var(--space-2);margin-bottom:var(--space-3);flex-wrap:wrap;display:flex}.workbook-files span{padding:var(--space-1) var(--space-2);border-bottom:2px solid var(--color-orange);font-size:var(--size-small)}.sample-preview-layout{gap:var(--space-6);display:grid}.sample-placeholder{text-align:center;min-height:10rem;padding:var(--space-8);border:1px dashed var(--color-muted);border-radius:var(--radius);background:var(--color-paper);color:var(--color-muted);place-items:center;display:grid}.product-copy p{margin-top:var(--space-4)}.product-copy .tick-list{margin-top:var(--space-6)}.compatibility{padding-top:var(--space-6);margin-top:var(--space-8);border-top:1px solid var(--color-line);max-width:none}.gallery-section{background:var(--color-stone)}.gallery-grid{gap:var(--space-8);display:grid}.gallery-grid figure{min-width:0}.sample-button{border:1px solid var(--color-line);border-radius:var(--radius);aspect-ratio:3/4;background:var(--color-paper);width:100%;box-shadow:var(--shadow-card);transition:transform var(--duration-button),box-shadow var(--duration-button);padding:0;display:block;position:relative;overflow:hidden}.sample-button img{object-fit:cover;object-position:top;width:100%;height:100%}.sample-open{bottom:var(--space-4);right:var(--space-4);width:var(--control-size);height:var(--control-size);background:var(--color-orange);color:var(--color-ink);border-radius:var(--radius-circle);box-shadow:var(--shadow-card);place-items:center;font-size:1.5rem;display:grid;position:absolute}.gallery-grid figcaption{margin-bottom:var(--space-4);font-size:1rem;font-weight:700;line-height:1.5}.image-viewer{width:100%;max-width:none;height:100dvh;max-height:none;padding:var(--space-4);background:0 0;border:0;margin:0;overflow:hidden}.image-viewer::backdrop{background:#242c31d9}.viewer-panel{background:var(--color-paper);border-radius:var(--radius);flex-direction:column;width:min(100%,61.25rem);height:100%;margin:auto;display:flex;overflow:hidden}.viewer-top{padding:var(--space-2) var(--space-4);justify-content:space-between;align-items:center;gap:var(--space-4);border-bottom:1px solid var(--color-line);display:flex}.viewer-top p{font-size:var(--size-small);font-weight:700;line-height:1.5}.viewer-close,.viewer-controls button{min-width:var(--control-size);min-height:var(--control-size);border:1px solid var(--color-line);border-radius:var(--radius);background:var(--color-paper);padding:var(--space-2)}.viewer-close{flex:0 0 var(--control-size);font-size:1.5rem}.viewer-image{overscroll-behavior:contain;background:var(--color-stone);flex:1;min-height:0;overflow:auto}.viewer-image img{object-fit:contain;width:auto;max-width:100%;height:100%;margin-inline:auto}.viewer-image.zoomed img{width:var(--sample-original-width);max-width:none;height:auto;margin:0 auto}.viewer-image.reading{background:var(--color-paper)}.sample-reading{max-width:var(--reader-width);padding:var(--space-6);margin-inline:auto}.sample-reading section+section{margin-top:var(--space-8)}.sample-reading h3{margin-bottom:var(--space-4)}.sample-reading ul{padding-left:var(--space-6)}.sample-reading li+li{margin-top:var(--space-3)}.sample-record{margin:var(--space-4) 0;padding:var(--space-4);background:var(--color-stone);border-radius:var(--radius)}.sample-record>div+div{margin-top:var(--space-3)}.sample-record dt{font-weight:700}.sample-record dd{overflow-wrap:anywhere;margin:0}.viewer-controls{justify-content:center;align-items:center;gap:var(--space-2);padding:var(--space-2);border-top:1px solid var(--color-line);font-size:var(--size-small);flex-wrap:wrap;display:flex}.viewer-controls [aria-pressed=true]{background:var(--color-orange);border-color:var(--color-orange);font-weight:700}.viewer-controls span{padding-inline:var(--space-2)}.testimonial-grid{gap:var(--space-6);display:grid}.testimonial{overflow-wrap:anywhere;border:1px solid var(--color-line);border-radius:var(--radius);background:var(--color-paper);min-width:0;padding:var(--space-8);box-shadow:var(--shadow-card)}.testimonial:first-child{background:var(--color-cream);border-color:var(--color-cream)}.testimonial 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var(--color-orange)}.price-card{background:var(--color-paper);border-radius:var(--radius);box-shadow:var(--shadow-card);min-width:0;overflow:hidden}.card-strip{text-align:center;background:var(--color-orange);padding:var(--space-3) var(--space-6);font-size:1rem;font-weight:700}.card-body{padding:var(--space-6)}.package-price{font-family:var(--font-heading);font-size:var(--size-price);margin-bottom:var(--space-3);overflow-wrap:anywhere;text-align:center;font-variant-numeric:tabular-nums;line-height:1.1;display:block}.price-card .bundle-saving,.price-card .card-body>.small{text-align:center}.price-card .bundle-saving p{margin-inline:auto}.package-specifications{font-size:var(--size-small);padding-block:var(--space-4);margin-block:var(--space-6);border-block:1px solid var(--color-line)}.card-body .button{width:100%;margin-top:var(--space-6)}.checkout-note{margin-top:var(--space-4);text-align:center}.primary-questions,.secondary-questions{gap:var(--space-8);display:grid}.primary-questions article{padding-left:var(--space-6);border-left:3px solid var(--color-orange)}.primary-questions h3,.secondary-questions h3{font-family:var(--font-sans);letter-spacing:normal;font-size:1.1875rem;line-height:1.3}.primary-questions p,.question-answer p{margin-top:var(--space-4)}.secondary-questions{margin-top:var(--space-8);border-top:1px solid var(--color-line);gap:0}.question{border-bottom:1px solid var(--color-line)}.question-toggle{padding:var(--space-4) 0;width:100%;min-height:var(--control-size);justify-content:space-between;align-items:center;gap:var(--space-4);text-align:left;background:0 0;border:0;font-weight:700;display:flex}.question-toggle span{font-size:1.5rem}.question-desktop-title,.question-answer{display:none}.question.is-open .question-answer{padding-bottom:var(--space-6);display:block}.question-answer p{margin-top:0}.site-footer{padding-block:var(--space-8) calc(var(--space-8) + 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0;min-width:0;margin:0}.purchase-consents legend{padding:0 var(--space-3) 0 0;font-weight:700}.consent-row{grid-template-columns:var(--space-6) minmax(0,1fr);gap:var(--space-4);margin-bottom:var(--space-6);align-items:start;display:grid}.consent-row input{accent-color:var(--color-ink);width:var(--space-6);height:var(--space-6);margin:var(--space-3) 0 0;cursor:pointer}.consent-row label{min-height:var(--control-size);padding-block:var(--space-2);cursor:pointer}.checkout-unavailable{background:var(--color-stone);padding:var(--space-4);border-radius:var(--radius)}.checkout-unavailable>p:first-child{font-weight:700}.checkout-button{width:100%;margin-top:var(--space-6)}.purchase-payment{margin-top:var(--space-4)}section[id]{scroll-margin-top:var(--space-8)}.hero-reveal{animation:hero-in var(--duration-hero) var(--ease) both}.hero-lead{animation-delay:var(--delay-hero)}.hero-purchase{animation-delay:calc(2 * var(--delay-hero))}.hero-art{animation-delay:calc(3 * 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a{min-height:var(--control-size);color:var(--color-ink);font-size:var(--size-small);align-items:center;font-weight:700;text-decoration:none;display:inline-flex}.primary-nav a:hover{color:var(--color-rust);text-decoration:underline}.legal-page h2{font-size:var(--size-h3);margin-block:var(--space-8) var(--space-4)}.legal-body,.legal-intro,.legal-contact{max-width:var(--measure)}.legal-intro{background:var(--color-cream);padding:var(--space-6);border-radius:var(--radius)}.legal-intro p{margin-top:var(--space-2)}.legal-nav{gap:var(--space-2) var(--space-6);margin-block:var(--space-6) var(--space-8);border-bottom:1px solid var(--color-line);flex-wrap:wrap;display:flex}.legal-nav a,.legal-resource,.legal-contact a,.privacy-link,.footer-meta a{min-height:var(--control-size);overflow-wrap:anywhere;align-items:center;display:inline-flex}.legal-nav a[aria-current=page]{color:var(--color-ink);font-weight:700;text-decoration-thickness:2px}.legal-contact{border-top:1px solid var(--color-line);margin-top:var(--space-12)}.footer-meta{flex-wrap:wrap;align-items:center}@media print{.site-header,.site-footer,.skip-link,.legal-nav{display:none}.legal-page{padding:0}.legal-page h2{break-after:avoid}.legal-page p{orphans:3;widows:3}}.workbook-definitions{margin:var(--space-4) 0;gap:var(--space-4);display:grid}.workbook-definitions dt{color:var(--color-ink);font-weight:700}.workbook-definitions dd{color:var(--color-muted);margin:0}.workbook-definitions.compact{gap:var(--space-2);margin-block:var(--space-2) 0}.workbook-definitions.compact>div{gap:var(--space-2);flex-wrap:wrap;display:flex}.primary-questions .workbook-definitions+p{margin-top:var(--space-4)}.carousel-controls button:hover,.role-options button:hover:not([aria-pressed=true]){border-color:var(--color-muted)}::selection{background:var(--color-cream);color:var(--color-ink)}@media(min-width:768px){.primary-nav{width:auto;margin-left:auto;margin-right:var(--space-6);gap:var(--space-6);border:0;order:0}}.purchase-page>h1{margin-bottom:var(--space-8)}.purchase-intro{margin-bottom:var(--space-12)}.purchase-choices .edition-selector{margin-top:0}.purchase-choices .edition-options,.purchase-choices .role-space{max-width:none}.purchase-includes{margin-block:var(--space-8)}.purchase-includes h2{font-size:var(--size-h3);margin-bottom:var(--space-6)}.download-details{border-block:1px solid var(--color-line)}.download-details summary{cursor:pointer;min-height:var(--control-size);padding-block:var(--space-3);font-weight:700}.purchase-choices>a{margin-top:var(--space-3)}.order-product{grid-template-columns:minmax(0,1fr) minmax(0,1.4fr)}.order-product .book-visual{height:var(--order-art-height)}.order-product .book-visual img{max-width:none}.order-product h2,.order-product h3{font-size:var(--size-lead)}.order-total{justify-content:space-between;gap:var(--space-4);border-top:1px solid var(--color-orange);padding-top:var(--space-6);margin-top:var(--space-6);flex-wrap:wrap;align-items:center;display:flex}.order-total .order-price{margin:0}.order-delivery{margin-block:var(--space-4) var(--space-6)}.order-summary .bundle-saving>strong{background:var(--color-paper)}.order-summary .purchase-consents{border-color:var(--color-orange);font-size:var(--size-small)}.order-summary .purchase-consents legend{display:none}.checkout-unavailable{margin-top:var(--space-6);background:0 0;border-radius:0;padding:0}.checkout-unavailable p+p{margin-top:var(--space-2)}@media(min-width:768px){:root{--carousel-height:32rem}}@media(min-width:1024px){.purchase-layout{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr)}}.purchase-choices .order-summary{margin-block:var(--space-4) var(--space-6)}.purchase-choices .order-product{margin-bottom:var(--space-4)}.purchase-choices .order-product .book-visual{height:calc(var(--order-art-height) - var(--space-4))}.purchase-choices .tick-list{gap:var(--space-2)}.edition-selector-compact .role-space{margin-top:var(--space-3)}.edition-selector-compact .sole-scope{justify-content:center}.payment-panel{min-width:0}.payment-panel h2{font-size:var(--size-h3)}.payment-panel .purchase-consents{font-size:var(--size-small);border:0;padding-top:0}.payment-panel .purchase-consents legend{clip-path:inset(50%);width:1px;height:1px;position:absolute;overflow:hidden}.payment-panel .consent-row{margin-bottom:var(--space-4)}.payment-panel .checkout-unavailable{margin-top:var(--space-4)}.embedded-payment{border:1px solid var(--color-line);border-radius:var(--radius-panel);margin-top:var(--space-6);overflow:hidden}.embedded-payment-heading{justify-content:space-between;align-items:center;gap:var(--space-2);padding:var(--space-4) var(--space-6);background:var(--color-cream);flex-wrap:wrap;display:flex}.payment-placeholder{padding:var(--space-6)}.payment-placeholder p{font-size:var(--size-small);color:var(--color-muted);margin-bottom:var(--space-6)}.payment-placeholder .button{width:100%}.checkout-mount{min-width:0}.payment-test-note{padding:var(--space-4) var(--space-6);border-top:1px solid var(--color-line)}@media(prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}.reveal-pending{opacity:1;transform:none}.sample-button:hover{transform:none}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}