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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.sidebar{transition:none}}
@media print{.sidebar,.topbar,.margin-notes,.chapter-footer,.copy-button,.book-foot{display:none}.main-shell{margin:0}.page-layout{display:block;padding:0;max-width:none}.prose details:not([open]) .detail-content{display:block}.prompt,.example,.task{break-inside:avoid}body{font-size:12pt}h1{font-size:32pt}a{color:inherit}}
/* Real application examples and editorial screenshots. */
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@media(max-width:540px){.demo-heading{align-items:flex-start;padding:12px;flex-wrap:wrap}.demo-actions{padding:12px;gap:8px}.demo-actions button{font-size:13px}.prose .demo-status{padding:0 12px 12px}.screenshot-pair{grid-template-columns:1fr}.app-screenshot figcaption{font-size:13px}}
@media print{.live-demo iframe,.demo-actions{display:none}.app-screenshot{break-inside:avoid}}
.app-screenshot.is-mobile{max-width:330px;margin:28px auto}
/* Editorial edition: reading, examples, practice, and a clear next step. */
:root{--muted:#596168}
.page-layout{grid-template-columns:minmax(0,760px) 160px;gap:42px;padding-top:44px;max-width:1080px}
.article{max-width:760px}.chapter-head{margin-bottom:28px}h1{font-size:clamp(40px,4.3vw,60px);letter-spacing:-1.8px}.intro h1{font-size:clamp(43px,4.6vw,64px);line-height:1.1;letter-spacing:-2px}.intro .chapter-head{margin-bottom:24px}.dek{font-size:20px}.chapter-hint{font-size:15px;line-height:1.6;color:var(--muted);margin-top:18px;max-width:620px}.head-rule{margin-top:25px}.eyebrow{margin-bottom:17px}.tiny-label{font-size:12px;letter-spacing:1.2px}.prose h2{margin-top:44px}.prose p{margin-bottom:19px}.prose strong{font-weight:650}.prose blockquote{border:0;padding:0;font-size:28px;margin:36px 0}.prose .principle{font:26px/1.4 var(--serif);margin:32px 0;padding:0 0 0 20px;border-left:3px solid var(--blue)}
.margin-notes{padding-top:9px}.toc a{font-size:14px;margin-bottom:15px}.margin-sticky{top:28px}.chapter-link{font-size:14px}.nav-group{font-size:12px}.copy-button{font-size:14px}.prompt pre{font-size:17px}.prompt-top .tiny-label{font-size:12px}.detail-content,.prose summary{font-size:17px}.note{font-size:16px}.example{background:transparent;border:0;border-left:2px solid #c9d1e4;border-radius:0;padding:4px 0 4px 22px;margin:27px 0}.example .tiny-label{color:var(--blue)}
.reader-step{margin-top:42px;padding:25px 27px;background:var(--blue-soft);border-top:3px solid var(--blue)}.reader-step .tiny-label{color:var(--blue);margin-bottom:12px}.prose .step-action{font-size:19px;margin-bottom:18px}.prose .step-check{font-size:16px;margin-bottom:0}.prose .step-bridge{font-size:16px;margin:18px 0 0;padding-top:17px;border-top:1px solid #cbd5fa;color:#46536f}.chapter-footer{margin-top:22px;padding-top:20px;border:0}.pager span{font-size:13px}
.project-note{margin:30px 0;background:#f8f9fc;border:1px solid #dce1ec;padding:25px 27px}.project-note .tiny-label{color:var(--blue);margin-bottom:16px}.project-note dl{margin:0}.project-note dt{font-size:14px;color:var(--muted);margin-top:17px}.project-note dt:first-child{margin-top:0}.project-note dd{margin:4px 0 0;font-size:18px}.project-note .blank{color:#626b7d;border-bottom:1px dashed #aab4c7;display:inline-block;min-width:100px}.prose .figure-caption,figcaption{font-size:14px;line-height:1.6;color:var(--muted)}
.hero-proof{margin:24px 0 30px}.hero-proof img{width:100%;height:auto;display:block;border-radius:7px;border:1px solid #d9dfd7}.hero-proof figcaption{margin:11px 0}.intro-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}.intro-actions .start-link{padding:11px 18px;font-size:16px}.intro-actions>a:not(.start-link){font-size:16px}.route-strip{display:flex;flex-wrap:wrap;list-style:none!important;padding:0!important;gap:7px;margin:23px 0!important}.route-strip li{font-size:14px;padding:7px 11px!important;border:1px solid #dce1ed;border-radius:4px;margin:0!important}.route-strip li span{color:var(--blue);margin-right:7px;font-variant-numeric:tabular-nums}
.iphone-example{margin:30px 0;border:1px solid #dce1e9;border-radius:7px;overflow:hidden;background:#f8f9fc}.iphone-example img{display:block;width:100%;height:240px;object-fit:cover}.iphone-calculation{padding:24px}.iphone-calculation .tiny-label{color:var(--blue);margin-bottom:14px}.value-pair{display:grid;grid-template-columns:1fr 1fr;gap:14px}.value-pair div{background:white;border:1px solid #d9deea;padding:12px 15px;border-radius:4px}.value-pair span{font-size:14px;color:var(--muted);display:block}.value-pair strong{font-size:24px}.iphone-result{font:38px/1.15 var(--serif);margin:19px 0 10px!important}.iphone-example figcaption{padding:0 24px 20px}.image-credit{display:block;font-size:12px;margin-top:9px}
.idea-shelf{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:28px 0}.idea-shelf article{padding:19px 16px;background:#f7f8fb;border-top:2px solid #a8b8ee}.idea-shelf h3{font-size:18px;margin:0 0 10px}.idea-shelf p{font-size:15px;line-height:1.6;margin-bottom:0}.idea-shelf .small-result{font-size:20px;line-height:1.3;margin:15px 0;font-family:var(--serif)}
.state-story{margin:30px 0}.state-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.state-panel{border:1px solid #dce1e9;background:#fafbfc;padding:17px 15px;min-width:0}.state-panel .state-number{color:var(--blue);font-size:13px;display:block;margin-bottom:13px}.state-panel h3{font-size:17px;margin:0 0 10px}.state-panel p{font-size:14px;margin-bottom:0}.state-value{font-size:21px;font-family:var(--serif);line-height:1.3;display:block;margin:15px 0}.state-story figcaption{margin-top:12px}
.prompt-map{margin:27px 0}.prompt-map>div{display:grid;grid-template-columns:1fr 1.15fr;gap:24px;border-top:1px solid var(--line);padding:17px 0}.prompt-map p{font-size:16px;margin:0!important}.prompt-map span{font-size:13px;color:var(--muted);display:block;margin-bottom:7px}.prompt-map>div>p:last-child{border-left:2px solid #b7c5f0;padding-left:19px}.setup-step{margin:28px 0 36px}.setup-step h3{font-size:22px}.setup-step .expected{font-size:16px;color:#3f5c4a;border-left:2px solid #96ac9d;padding-left:15px}.manual-figure{margin:24px 0}.manual-figure img{width:100%;height:auto;border:1px solid var(--line);border-radius:6px}.manual-figure figcaption{margin-top:12px}.compare-pair{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:24px 0}.compare-pair img{width:100%;height:auto;border:1px solid var(--line);display:block}.compare-pair figcaption{margin-top:9px}.compare-pair figure{margin:0}.optional-practice{margin-top:35px!important}.optional-practice>.detail-content{padding-left:0}.prose .exercise-label{font-size:13px;letter-spacing:1px;text-transform:uppercase;color:var(--blue);margin-top:36px}.prose .source-note{font-size:14px;line-height:1.6;color:var(--muted)}
@media(min-width:1600px){.page-layout{padding-top:48px}}
@media(max-width:1240px){.page-layout{display:block;max-width:850px}.margin-notes{display:none}}
@media(max-width:900px){.page-layout{max-width:790px;padding-top:32px}.intro h1{font-size:54px}.chapter-hint{font-size:15px}}
@media(max-width:540px){.page-layout{padding:28px 21px 20px}.intro h1{font-size:42px;letter-spacing:-1.4px}h1{font-size:40px;letter-spacing:-1.4px}.dek{font-size:19px}.reader-step,.project-note{padding:22px 19px}.prose .step-action{font-size:18px}.idea-shelf,.state-grid,.compare-pair{grid-template-columns:1fr}.state-panel{padding:19px}.prompt-map>div{grid-template-columns:1fr;gap:12px}.iphone-example img{height:185px}.iphone-calculation{padding:19px}.iphone-example figcaption{padding:0 19px 18px}.value-pair{gap:9px}.value-pair div{padding:10px}.value-pair strong{font-size:22px}.iphone-result{font-size:32px}.intro-actions{align-items:stretch}.intro-actions .start-link{width:100%}.prompt pre{font-size:16px}.prose blockquote,.prose .principle{font-size:25px}.prose h2{font-size:25px}.prompt-top{flex-wrap:wrap}.demo-heading{flex-wrap:wrap;align-items:flex-start}.demo-heading a{font-size:14px}.demo-actions button{font-size:14px}}
@media print{.reader-step,.project-note,.state-panel,.iphone-example{break-inside:avoid}.optional-practice .detail-content{display:block}.intro-actions{display:none}.live-demo iframe,.demo-actions{display:none}}
.state-panel img{display:block;width:100%;height:175px;object-fit:contain;object-position:top;background:#f3f5f0;border-radius:4px;margin-bottom:14px}.selector-figure{display:grid;grid-template-columns:256px 1fr;gap:22px;align-items:center}.selector-figure img{max-width:256px}.selector-figure figcaption{margin:0}.scope-cut{display:grid;gap:0;margin:28px 0;border:1px solid var(--line)}.scope-cut>div{padding:20px 24px}.scope-cut>div:first-child{background:#f7f8fa;color:var(--muted)}.scope-cut>div:last-child{border-top:1px solid var(--line);border-left:3px solid var(--blue)}.scope-cut .tiny-label{display:block;margin-bottom:8px}.scope-cut p{margin:0!important}.hero-proof img{max-height:390px;object-fit:cover;object-position:center 40%}.prose small{font-size:14px;line-height:1.6;color:var(--muted)}
@media(max-width:540px){.selector-figure{display:block}.selector-figure img{margin:0 0 15px}.state-panel img{height:auto;max-height:310px}.hero-proof img{max-height:none;object-fit:contain}.scope-cut>div{padding:19px}}
.intro h1{font-size:clamp(42px,4.2vw,58px);letter-spacing:-1.8px}.intro .prose>.intro-actions{margin:23px 0 24px}.intro .hero-proof{margin-top:0}
@media(max-width:540px){.intro h1{font-size:42px;letter-spacing:-1.3px}}

/* The author's voice belongs beside the lesson, at every screen size. */
.author-intro{display:grid;grid-template-columns:104px 1fr;gap:24px;align-items:center;margin:32px 0}
.author-intro img{width:104px;height:132px;object-fit:cover;object-position:50% 64%;border-radius:4px}
.author-intro p{margin:0 0 8px}.author-intro .author-hello{font-weight:700;font-size:21px}
.author-margin{border-left:2px solid #2449d8;padding:4px 0 4px 24px;margin:38px 0;color:#454956}
.author-margin p{font-size:17px;line-height:1.7;margin:12px 0}.author-margin .tiny-label{color:#2449d8}
@media(max-width:600px){.author-intro{grid-template-columns:76px 1fr;gap:16px}.author-intro img{width:76px;height:106px}.author-intro .author-hello{font-size:19px}.author-intro p{font-size:16px}.author-margin{padding-left:18px}}

.prompt-workbook{padding:24px}.prompt-builder{margin:0}.builder-opening{font-weight:600}.builder-line{display:block;margin:22px 0}.builder-line>span{display:block;margin-bottom:7px;font-size:17px}.builder-line small{font-size:13px;color:#616777}.builder-line textarea{display:block;box-sizing:border-box;width:100%;min-height:76px;resize:vertical;padding:12px 14px;border:1px solid #b9c5e3;border-bottom:2px solid #6981cf;border-radius:4px;background:#fff;color:#25282e;font:inherit;font-size:17px;line-height:1.5}.builder-line textarea::placeholder{color:#737b8b}.builder-line textarea:focus{outline:2px solid #2449d8;outline-offset:3px}.builder-privacy{font-size:14px!important;color:#616777}.builder-preview{margin:16px 0 0}.builder-preview pre{white-space:pre-wrap;overflow-wrap:anywhere}.prompt-workbook .prompt-top{flex-wrap:wrap;gap:12px}.prompt-workbook .copy-button{white-space:normal}@media(max-width:600px){.prompt-workbook{padding:16px}.builder-line textarea{font-size:16px}}

.contact-note{margin:36px 0;padding:24px 26px;background:#fff6ce;border:1px solid #ead58a;border-left:4px solid #d4a322;border-radius:5px;color:#453c23}.contact-note p{font-size:16px;line-height:1.65;margin:0 0 12px}.contact-note .contact-note-title{font-size:19px;font-weight:700;color:#342d19}.contact-note p:last-child{margin-bottom:0}.contact-note a{color:#57400b;text-decoration:underline;text-underline-offset:3px}.contact-note a:focus-visible{outline:2px solid #57400b;outline-offset:4px}.contact-note .contact-links{display:flex;flex-wrap:wrap;gap:8px 22px;font-weight:600}@media(max-width:600px){.contact-note{padding:20px}.contact-note .contact-links{flex-direction:column;align-items:flex-start;overflow-wrap:anywhere}}

.builder-storage{font-size:14px!important;color:#47526a}.clear-draft{margin-top:20px;padding:9px 12px;background:transparent;border:1px solid #9ba8c2;border-radius:4px;font:inherit;font-size:14px;color:#47526a;cursor:pointer}.clear-draft:focus-visible{outline:2px solid #2449d8;outline-offset:3px}.builder-line textarea[aria-invalid=true]{border-color:#b13728}.copy-button:disabled{opacity:.6;cursor:wait}

.field-error{display:block;color:#a3291e;font-size:14px;margin-top:8px}.field-error[hidden]{display:none}.manual-copy{display:block;width:100%;box-sizing:border-box;padding:14px;font:16px/1.6 var(--sans);background:white;border:2px solid #2449d8;border-radius:4px;resize:vertical}.manual-copy[hidden]{display:none}

/* Optional analytics: equal choices, keyboard access, compact mobile layout. */
.analytics-settings{background:none;border:0;padding:0;color:var(--muted,#666);font:inherit;font-size:12px;text-decoration:underline;cursor:pointer}
.analytics-consent{position:fixed;z-index:100;bottom:20px;right:20px;width:min(460px,calc(100vw - 32px));max-height:80dvh;overflow:auto;background:#fffdf5;color:#252525;border:1px solid #d8d1b8;border-radius:12px;padding:22px;box-shadow:0 6px 32px #0002;font:14px/1.5 Arial,sans-serif}
.analytics-consent[hidden],.analytics-settings[hidden]{display:none}
.analytics-consent h2{font:600 20px/1.2 Georgia,serif;margin:0 0 10px}.analytics-consent p{margin:8px 0}.analytics-note{font-size:12px;color:#666}.analytics-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.analytics-actions button{flex:1;min-width:170px;border:1px solid #2449d8;border-radius:6px;background:white;color:#2449d8;padding:11px 10px;font:600 13px/1.3 Arial,sans-serif;cursor:pointer}.analytics-actions button:hover{background:#eef1ff}.analytics-consent :focus-visible,.analytics-settings:focus-visible{outline:3px solid #2449d8;outline-offset:3px}.book-foot{flex-wrap:wrap;gap:12px}
@media(max-width:600px){.analytics-consent{bottom:12px;right:16px;padding:18px}.analytics-actions button{min-width:0;flex-basis:100%}}