/* Scoped to the compact lesson page; existing lesson and experiment layouts
   continue to use the shared stylesheet. */
.lesson-landing { max-width: 1120px; padding-top: 25px; }
.lesson-landing .breadcrumbs { font-size: .82rem; flex-wrap: wrap; margin-bottom: 34px; }
.lesson-landing-hero { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: clamp(32px, 5vw, 64px); align-items: center; padding: 10px 0 46px; }
.lesson-landing h1 { font-size: clamp(2.4rem, 4.7vw, 3.65rem); line-height: 1.04; margin-bottom: 20px; letter-spacing: -.045em; }
.lesson-landing .eyebrow { font-size: .7rem; letter-spacing: .1em; }
.lesson-landing-intro > .eyebrow { margin-bottom: 18px; }
.lesson-landing-summary { color: #4c607b; font-size: 1.1rem; line-height: 1.6; margin-bottom: 24px; max-width: 43ch; }
.lesson-landing .button-link { gap: 24px; padding-inline: 23px; }
.lesson-landing .button-link > span { font-size: 1.3rem; line-height: 1; }
.lesson-landing a:focus-visible, .lesson-landing summary:focus-visible { outline: 3px solid #1762c3; outline-offset: 5px; }
.lesson-landing-facts { list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-wrap: wrap; gap: 5px 15px; color: #52647b; font-size: .78rem; }
.lesson-landing-facts li { display: flex; align-items: center; gap: 7px; }
.lesson-landing-facts li::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: #2c8067; }
.lesson-landing-preview { margin: 0; min-width: 0; padding: 10px; background: #fff; border: 1px solid #d9e4f1; border-radius: 22px; box-shadow: 0 18px 45px #244a7910; }
.lesson-landing .lesson-hero-visual { border-radius: 14px; border: 0; box-shadow: none; }
.lesson-landing .lesson-launch-preview img { height: 100%; object-fit: cover; }
.lesson-landing-preview figcaption { padding: 11px 5px 3px; font-size: .8rem; text-align: center; color: #52647b; }
.lesson-landing-section-heading { margin-bottom: 21px; }
.lesson-landing h2 { font-size: clamp(1.4rem, 2.6vw, 1.8rem); margin: 0; letter-spacing: -.025em; }
.lesson-landing h3 { color: #172b45; font-size: 1.05rem; line-height: 1.3; margin: 0 0 9px; letter-spacing: -.015em; }
.lesson-landing-outcomes { border-top: 1px solid #d9e4f1; padding: 32px 0 34px; }
.lesson-landing-outcome-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 27px; }
.lesson-landing-outcome-grid article { position: relative; padding-left: 39px; }
.lesson-landing-step { position: absolute; top: 1px; left: 0; font-size: .74rem; font-weight: 800; color: #1a5fd0; background: #e6eefb; width: 28px; height: 28px; display: grid; place-items: center; border-radius: 8px; }
.lesson-landing-outcome-grid p, .lesson-landing-concept-grid p { color: #4c607b; font-size: .94rem; line-height: 1.6; margin: 0; }
.lesson-landing-concepts { border: 1px solid #d9e4f1; border-radius: 20px; padding: 27px 30px 25px; background: #fff; }
.lesson-landing-concept-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.lesson-landing-concept-grid strong { color: #263c55; font-weight: 700; }
.lesson-landing-example { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, .9fr); gap: 26px; align-items: center; margin-top: 24px; padding-top: 22px; border-top: 1px solid #e0e8f2; }
.lesson-landing-example p { margin-bottom: 6px; font-size: .9rem; color: #4c607b; }
.lesson-landing-example .eyebrow { color: #1762c3; font-size: .68rem; }
.lesson-landing-example-result { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.lesson-landing-example-result strong { color: #172b45; }
.lesson-landing-example svg { display: block; width: 100%; height: auto; max-width: 410px; justify-self: end; font-family: inherit; }
.lesson-landing-teacher { margin-top: 22px; border: 1px solid #d9e4f1; border-radius: 16px; background: #fff; }
.lesson-landing-teacher summary { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 19px 24px; cursor: pointer; list-style: none; border-radius: 16px; }
.lesson-landing-teacher summary::-webkit-details-marker { display: none; }
.lesson-landing-teacher summary strong { display: block; color: #172b45; font-size: 1rem; }
.lesson-landing-teacher summary span > span { display: block; color: #52647b; font-size: .82rem; margin-top: 2px; }
.lesson-landing-expand { flex: 0 0 28px; height: 28px; border: 1px solid #d9e4f1; border-radius: 50%; display: grid; place-items: center; color: #1a5fd0; }
.lesson-landing-expand::after { content: "+"; font-size: 1.2rem; line-height: 1; }
.lesson-landing-teacher[open] .lesson-landing-expand::after { content: "−"; }
.lesson-landing-teacher-content { padding: 0 24px 22px; border-top: 1px solid #e0e8f2; }
.lesson-landing-teacher dl { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 30px; margin: 22px 0; }
.lesson-landing-teacher dt { color: #172b45; font-size: .86rem; font-weight: 750; margin-bottom: 4px; }
.lesson-landing-teacher dd { color: #4c607b; font-size: .86rem; line-height: 1.6; margin: 0; }
.lesson-landing-teacher a { color: #1859b8; text-underline-offset: 3px; }
.lesson-landing-teacher-content > a { font-size: .84rem; }
.lesson-landing-finish { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-top: 30px; padding: 28px 0; }
.lesson-landing-finish h2 { font-size: 1.45rem; margin-bottom: 8px; }
.lesson-landing-finish p { color: #4c607b; font-size: .92rem; margin: 0; }
.lesson-landing-finish .button-link { flex-shrink: 0; }
.lesson-landing-next { display: flex; flex-wrap: wrap; gap: 6px 15px; border-top: 1px solid #d9e4f1; padding-top: 20px; font-size: .85rem; }
.lesson-landing-next > span { color: #63748d; }
.lesson-landing-next > a { color: #1859b8; font-weight: 650; text-underline-offset: 4px; }
@media (max-width: 850px) {
  .lesson-landing-hero { gap: 28px; }
  .lesson-landing h1 { font-size: 2.6rem; }
  .lesson-landing-summary { font-size: 1rem; }
  .lesson-landing-outcome-grid { gap: 18px; }
  .lesson-landing-outcome-grid article { padding-left: 0; }
  .lesson-landing-step { position: static; margin-bottom: 12px; }
}
@media (max-width: 640px) {
  .lesson-landing { padding-top: 18px; padding-bottom: 40px; }
  .lesson-landing .breadcrumbs { font-size: .75rem; margin-bottom: 25px; }
  .lesson-landing-hero { grid-template-columns: 1fr; gap: 26px; padding-top: 0; padding-bottom: 29px; }
  .lesson-landing h1 { font-size: clamp(2.15rem, 9.7vw, 3rem); max-width: 17ch; margin-bottom: 15px; }
  .lesson-landing-intro > .eyebrow { margin-bottom: 13px; font-size: .64rem; }
  .lesson-landing-summary { margin-bottom: 20px; }
  .lesson-landing-facts { justify-content: center; gap: 5px 13px; font-size: .74rem; margin-top: 13px; }
  .lesson-landing-preview { padding: 7px; border-radius: 18px; }
  .lesson-landing-preview figcaption { font-size: .75rem; padding-top: 8px; }
  .lesson-landing-outcomes { padding-block: 26px; }
  .lesson-landing-outcome-grid { grid-template-columns: 1fr; gap: 19px; }
  .lesson-landing-outcome-grid article { padding-left: 40px; }
  .lesson-landing-step { position: absolute; }
  .lesson-landing-concepts { padding: 22px 19px; border-radius: 16px; }
  .lesson-landing-concept-grid { grid-template-columns: 1fr; gap: 22px; }
  .lesson-landing-example { grid-template-columns: 1fr; gap: 12px; }
  .lesson-landing-example svg { justify-self: center; }
  .lesson-landing-teacher summary { padding: 17px 18px; }
  .lesson-landing-teacher summary span > span { font-size: .76rem; }
  .lesson-landing-teacher-content { padding-inline: 18px; }
  .lesson-landing-teacher dl { grid-template-columns: 1fr; }
  .lesson-landing-finish { flex-direction: column; align-items: flex-start; gap: 18px; padding-block: 7px 25px; margin-top: 27px; }
}
@media (prefers-reduced-motion: reduce) {
  .lesson-landing .lesson-launch-preview { transition: none; }
  .lesson-landing .lesson-launch-preview:hover, .lesson-landing .lesson-launch-preview:focus-visible { transform: none; }
}