.lesson-shell { max-width: 1440px; }
.lesson-shell em { font-family: Georgia, 'Times New Roman', serif; font-weight: 400; text-transform: none; letter-spacing: -.055em; }
.lesson-hub-hero { display: grid; grid-template-columns: 1.2fr .8fr; align-items: center; gap: 7%; padding: 10px 0 64px; }
.lesson-hub-hero h1 { font-size: clamp(58px, 7.5vw, 108px); line-height: 1.05; }
.lesson-hub-hero .lede { font-size: 19px; max-width: 620px; margin: 28px 0 20px; }
.lesson-intro-note { color: var(--muted); font-size: 13px; line-height: 1.8; max-width: 620px; margin: 22px 0; }
.lesson-cover { min-height: 440px; padding: 30px; background: var(--lime); color: var(--ink); border: 1px solid var(--ink); box-shadow: 12px 12px 0 var(--ink); transform: rotate(2deg); display: flex; flex-direction: column; justify-content: space-between; gap: 30px; }
.lesson-cover > span { font: 11px/1.7 'Courier New', monospace; letter-spacing: .06em; }
.lesson-cover strong { font: 650 clamp(52px, 5.8vw, 82px)/1.08 Oswald, 'Arial Narrow', sans-serif; letter-spacing: -.055em; }
.lesson-cover strong em { font-size: .91em; }
.lesson-topics { display: flex; flex-wrap: wrap; gap: 10px 25px; align-items: center; border-block: 1px solid var(--ink); padding: 20px 0; }
.lesson-topics > span { font: 10px/1.6 'Courier New', monospace; margin-right: auto; }
.lesson-topics a { display: inline-flex; min-height: 32px; align-items: center; font-size: 12px; font-weight: 700; text-decoration: none; }
.lesson-topics a:hover { text-decoration: underline; }
.lesson-start { display: grid; grid-template-columns: .7fr 1.5fr; gap: 50px; margin: 65px 0 85px; align-items: start; }
.lesson-start h2 { font-size: clamp(36px, 4vw, 50px); line-height: 1.12; letter-spacing: -.035em; margin: 0 0 20px; }
.lesson-start > div > p:not(.eyebrow) { font-size: 14px; line-height: 1.8; max-width: 300px; }
.lesson-featured-grid, .lesson-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.lesson-card { border-top: 1px solid var(--ink); padding-top: 18px; min-width: 0; }
.lesson-card-top { display: flex; justify-content: space-between; gap: 15px; font: 10px/1.6 'Courier New', monospace; text-transform: uppercase; letter-spacing: .04em; }
.lesson-card > a { display: flex; flex-direction: column; align-items: flex-start; text-decoration: none; padding: 23px 0 18px; }
.lesson-index { display: inline-block; color: var(--muted); font: 500 50px/1 Oswald, 'Arial Narrow', sans-serif; letter-spacing: -.05em; margin-bottom: 20px; }
.lesson-card h3 { font-size: clamp(25px, 2.6vw, 34px); line-height: 1.2; letter-spacing: -.02em; font-weight: 500; margin: 0 0 14px; max-width: 520px; }
.lesson-card p { color: var(--muted); font-size: 14px; line-height: 1.75; margin: 0 0 24px; max-width: 530px; }
.lesson-read { font-size: 12px; font-weight: 700; display: flex; gap: 30px; align-items: center; }
.lesson-read span { font-size: 24px; }
.lesson-card > a:hover h3 { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 5px; }
.lesson-featured { background: var(--ink); color: var(--paper); padding: 22px; border: 0; }
.lesson-featured .lesson-index { color: var(--lime); }
.lesson-featured p { color: #d3d5ca; font-size: 13px; }
.lesson-featured h3 { font-size: 27px; }
.lesson-featured .lesson-card-top { font-size: 9px; }
.lesson-category { margin-top: 65px; scroll-margin-top: 25px; }
.lesson-category-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; margin-bottom: 30px; }
.lesson-category-heading h2 { font-size: clamp(34px, 4vw, 50px); font-weight: 500; line-height: 1.1; margin: 0; letter-spacing: -.035em; }
.lesson-category-heading > span { font: 10px/1.6 'Courier New', monospace; }
.lesson-category-heading > a { font-size: 12px; }
.lesson-kit { display: grid; grid-template-columns: 1.3fr 1fr; align-items: center; gap: 50px; padding: 45px; background: var(--lime); margin-top: 70px; border: 1px solid var(--ink); }
.lesson-kit h2 { font-size: clamp(36px, 4.5vw, 57px); line-height: 1.1; letter-spacing: -.03em; margin: 0 0 22px; }
.lesson-kit p:not(.eyebrow) { font-size: 14px; line-height: 1.8; margin-bottom: 0; }
.lesson-kit-actions { max-width: 340px; justify-self: end; }
.lesson-kit-actions .discovery-button { line-height: 1.6; }
.lesson-kit-actions p { font-size: 12px !important; }
.lesson-policy { margin: 40px 0 0; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.8; }
.lesson-policy p { max-width: 800px; }
.lesson-links { display: flex; flex-wrap: wrap; gap: 12px 28px; margin: 24px 0 0; }
.lesson-links a { font-size: 13px; font-weight: 700; text-underline-offset: 4px; padding: 6px 0; }
.lesson-article-hero { max-width: 1000px; padding-bottom: 40px; }
.lesson-article-hero h1 { font-size: clamp(42px, 5vw, 72px); line-height: 1.1; text-transform: none; letter-spacing: -.035em; }
.lesson-byline { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 25px; font-size: 12px; color: var(--muted); line-height: 1.7; }
.lesson-article-layout { display: grid; grid-template-columns: minmax(180px, .5fr) minmax(0, 1.5fr); gap: 7%; border-top: 1px solid var(--ink); padding-top: 40px; }
.lesson-toc { align-self: start; position: sticky; top: 28px; }
.lesson-toc nav { display: grid; gap: 13px; }
.lesson-toc nav a { font-size: 12px; line-height: 1.65; text-decoration: none; }
.lesson-toc nav a:hover { text-decoration: underline; }
.lesson-toc-kit { display: block; font-size: 12px; line-height: 1.8; border-top: 1px solid var(--line); margin-top: 28px; padding-top: 22px; text-decoration: none; }
.lesson-document { max-width: 770px; }
.lesson-document section { margin-bottom: 48px; scroll-margin-top: 25px; }
.lesson-document h2 { font-size: clamp(28px, 3.4vw, 38px); font-weight: 500; line-height: 1.2; letter-spacing: -.02em; margin: 0 0 20px; }
.lesson-document p { font-size: 16px; line-height: 1.85; margin: 0 0 20px; }
.lesson-answer { padding: 28px 30px; background: #e7e9da; border-left: 5px solid var(--ink); }
.lesson-answer .eyebrow { font-size: 10px; margin: 0 0 16px; }
.lesson-answer h2 { font-size: 27px; }
.lesson-answer p:last-child { margin-bottom: 0; }
.lesson-example { margin: 26px 0; border: 1px solid var(--ink); background: #f8f7f0; }
.lesson-example figcaption { font: 11px/1.7 'Courier New', monospace; text-transform: uppercase; padding: 12px 20px; background: var(--ink); color: var(--paper); }
.lesson-example blockquote { margin: 0; padding: 24px; font-size: 15px; line-height: 1.9; white-space: pre-line; }
.lesson-source { font-size: 12px !important; color: var(--muted); }
.lesson-steps, .lesson-checklist { margin: 24px 0; padding-left: 25px; font-size: 16px; line-height: 1.8; }
.lesson-steps li, .lesson-checklist li { padding: 0 0 12px 7px; }
.lesson-document .discovery-faq p { margin-top: 14px; font-size: 15px; }
.lesson-next-product { border-top: 1px solid var(--ink); padding-top: 26px; }
.lesson-next-product p:last-child { font-size: 13px; color: var(--muted); margin-top: 18px; }
.kit-resource-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.kit-resource { border-top: 1px solid var(--ink); padding: 25px 0; }
.kit-resource h3 { font-size: 27px; line-height: 1.2; font-weight: 500; margin: 0 0 16px; }
.kit-resource p { font-size: 14px; line-height: 1.8; color: var(--muted); }
.kit-comparison { margin-top: 35px; }
.kit-comparison h2 { max-width: 800px; font-size: 35px; font-weight: 500; line-height: 1.2; }
.kit-comparison p:not(.eyebrow) { max-width: 850px; line-height: 1.85; }
.kit-terms { margin-top: 50px; }
@media (max-width: 1050px) {
  .lesson-start { grid-template-columns: 1fr; gap: 25px; }
  .lesson-start > div > p:not(.eyebrow) { max-width: 600px; }
  .lesson-cover { min-height: 390px; padding: 24px; }
  .lesson-cover strong { font-size: 55px; }
  .lesson-kit { gap: 30px; padding: 32px; }
  .lesson-article-layout { grid-template-columns: 190px minmax(0, 1fr); gap: 35px; }
}
@media (max-width: 720px) {
  .lesson-hub-hero { grid-template-columns: 1fr; gap: 38px; padding-bottom: 40px; }
  .lesson-hub-hero h1 { font-size: clamp(52px, 10vw, 72px); }
  .lesson-hub-hero .lede { font-size: 17px; }
  .lesson-cover { transform: none; min-height: 0; box-shadow: 7px 7px 0 var(--ink); margin-right: 7px; gap: 24px; }
  .lesson-cover strong { font-size: 46px; }
  .lesson-topics { gap: 8px 22px; }
  .lesson-topics > span { width: 100%; }
  .lesson-start { margin: 42px 0; }
  .lesson-featured-grid, .lesson-grid { grid-template-columns: 1fr; }
  .lesson-featured { padding: 25px; }
  .lesson-card h3 { font-size: 28px; }
  .lesson-category { margin-top: 45px; }
  .lesson-category-heading { align-items: flex-start; flex-direction: column; gap: 14px; }
  .lesson-kit { grid-template-columns: 1fr; padding: 26px; margin-top: 45px; gap: 24px; }
  .lesson-kit-actions { justify-self: start; max-width: none; }
  .lesson-article-layout { grid-template-columns: 1fr; gap: 30px; padding-top: 28px; }
  .lesson-toc { position: static; }
  .lesson-toc nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 20px; }
  .lesson-toc-kit { display: none; }
  .lesson-document p { font-size: 16px; line-height: 1.8; }
  .lesson-answer { padding: 24px 22px; }
  .lesson-example blockquote { padding: 20px; }
  .lesson-byline { gap: 8px 18px; }
  .kit-resource-grid { grid-template-columns: 1fr; }
}