.challenge-page { overflow-x: clip; }
.challenge-page .hdr,
.challenge-page .hdr.on-dark { background: var(--paper); color: var(--ink); }
.challenge-page .hdr.on-dark.is-stuck { background: color-mix(in srgb, var(--paper) 88%, transparent); border-bottom-color: var(--rule); }
.challenge-page .hdr.on-dark .btn { --btn-ink: var(--ink); --btn-fill: var(--ink); --btn-on-fill: var(--paper); }
.challenge-hero { position: relative; min-height: min(850px, 94svh); overflow: hidden; }
.challenge-hero__photo { position: absolute; inset: 0; opacity: .36; }
.challenge-hero__photo::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--night) 4%, rgba(20,16,11,.83) 46%, rgba(20,16,11,.32) 100%), linear-gradient(0deg,var(--night),transparent 50%); }
.challenge-hero__photo img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.challenge-hero__inner { position: relative; z-index: 1; padding-block: clamp(8rem, 15vw, 13rem) clamp(3rem, 6vw, 5rem); }
.challenge-hero__title { max-width: 9ch; margin: clamp(1.5rem,4vw,3.5rem) 0 1.5rem; font-family: var(--f-display); font-size: clamp(5rem, 12vw, 11rem); line-height: .8; letter-spacing: -.05em; }
.challenge-hero__title em { color: var(--rust-night); font-weight: 400; }
.challenge-hero__lead { max-width: 34ch; font-size: clamp(1.4rem,2.2vw,2.25rem); line-height: 1.23; color: var(--on-night); }
.challenge-hero__bottom { display: flex; align-items: flex-end; gap: 3rem; flex-wrap: wrap; margin-top: clamp(3rem,6vw,5rem); padding-top: 1.5rem; border-top: 1px solid var(--rule-night); }
.challenge-hero__bottom p { display: flex; align-items: center; gap: 1.5rem; max-width: 40rem; }
.challenge-hero__bottom strong { font-family: var(--f-display); font-size: clamp(2.5rem,5vw,5rem); line-height: 1; font-weight: 400; }
.challenge-hero__bottom span { max-width: 20rem; color: var(--on-night-2); }
.challenge-hero__date { margin-top: 1.5rem; text-transform: uppercase; }
.challenge-prose { font-size: clamp(1.15rem,1.6vw,1.5rem); line-height: 1.55; }
.challenge-prose p + p { margin-top: 1.1em; }
.challenge-prose h3 { font-family: var(--f-display); font-size: clamp(2rem,4vw,3.5rem); line-height: 1; margin: 2rem 0 1rem; }
.challenge-prose a:not(.btn) { text-decoration: underline; text-underline-offset: .15em; }
.challenge-prose .btn { margin-top: 2rem; }
.challenge-intro { background: var(--paper-hi); }
.challenge-intro__lead { font-family: var(--f-display); font-size: clamp(2.3rem,5vw,5rem); line-height: 1.05; }
.challenge-intro blockquote { margin: 2.5rem 0; padding-left: 1.5rem; border-left: 3px solid var(--rust); font-family: var(--f-display); font-size: clamp(2.3rem,4vw,4rem); line-height: 1.1; }
.challenge-turn h2 { margin: .5rem 0 2.5rem; max-width: 15ch; font-family: var(--f-display); font-size: clamp(3.5rem,7vw,7rem); line-height: .95; }
.challenge-how__grid { display: grid; grid-template-columns: minmax(0,.8fr) minmax(0,1fr); gap: clamp(3rem,8vw,9rem); }
.challenge-how h2 { max-width: 10ch; }
.challenge-steps { list-style: none; counter-reset: step; padding: 0; margin: 2rem 0; border-top: 1px solid var(--rule); }
.challenge-steps li { counter-increment: step; position: relative; padding: 1.25rem 0 1.25rem 3rem; border-bottom: 1px solid var(--rule); }
.challenge-steps li::before { content: "0" counter(step); position: absolute; left: 0; top: 1.5rem; color: var(--rust-ink); font: 700 .9rem var(--f-label); }
.challenge-included__grid, .challenge-curriculum__grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 1px; margin-top: 3rem; background: var(--rule-night); border: 1px solid var(--rule-night); }
.challenge-included article { min-height: 17rem; padding: clamp(1.5rem,3vw,3rem); background: var(--night); }
.challenge-included__n { display: block; color: var(--rust-night); font-family: var(--f-display); font-size: clamp(4rem,7vw,7rem); line-height: .9; }
.challenge-included h3, .challenge-curriculum h3 { margin-top: 2rem; font-family: var(--f-display); font-size: clamp(1.75rem,2.6vw,2.7rem); line-height: 1.06; }
.challenge-included p { margin-top: 1rem; color: var(--on-night-2); }
.challenge-included__close { font-family: var(--f-display); font-size: clamp(2rem,4vw,4rem); line-height: 1.1; max-width: 25ch; margin-top: 4rem !important; color: var(--on-night) !important; }
.challenge-curriculum { background: var(--paper-hi); }
.challenge-curriculum__grid { grid-template-columns: repeat(2,minmax(0,1fr)); background: var(--rule); border-color: var(--rule); }
.challenge-curriculum article { padding: clamp(1.5rem,3vw,3rem); background: var(--paper-hi); }
.challenge-curriculum h3 { margin: 1.5rem 0; }
.challenge-curriculum article p { font-size: clamp(1rem,1.2vw,1.2rem); line-height: 1.5; }
.challenge-curriculum .btn { margin-top: 3rem; }
.challenge-instructor__grid { display: grid; grid-template-columns: minmax(0,.8fr) minmax(0,1fr); gap: clamp(3rem,7vw,8rem); align-items: center; }
.challenge-instructor__grid > img { width: 100%; height: auto; object-fit: cover; filter: grayscale(1); border: 1px solid var(--rule-night); }
.challenge-instructor h2 { margin: 1rem 0 2rem; }
.challenge-faq details { border-top: 1px solid var(--rule); padding: 1.5rem 0; }
.challenge-faq details:last-child { border-bottom: 1px solid var(--rule); }
.challenge-faq h2 { margin: 1rem 0 3rem; }
.challenge-faq summary { cursor: pointer; font-family: var(--f-display); font-size: clamp(1.7rem,3vw,2.7rem); line-height: 1.1; }
.challenge-faq details p { max-width: 62ch; margin-top: 1.25rem; font-size: var(--t-lead); line-height: 1.5; }
.challenge-close h2 { margin: 1rem 0 2rem; max-width: 14ch; }
.challenge-close p:not(.label) { max-width: 36ch; color: var(--on-night-2); font-size: var(--t-lead); }
.challenge-close .btn { margin-top: 2rem; }
.challenge-purpose h2 { margin: .75rem 0 clamp(2rem, 4vw, 3rem); }
.challenge-spotlight { background: var(--rust); color: var(--paper-hi); padding-block: clamp(2rem,4vw,4rem); }
.challenge-spotlight__grid { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: end; gap: 2rem; }
.challenge-spotlight .label { color: var(--paper-hi); }
.challenge-spotlight h2 { font-family: var(--f-display); font-size: clamp(3rem,6vw,6rem); line-height: .9; margin: .8rem 0; }
.challenge-spotlight p:not(.label) { max-width: 42ch; font-size: var(--t-lead); }
.challenge-spotlight .btn { --btn-ink: var(--paper-hi); --btn-fill: var(--paper-hi); --btn-on-fill: var(--ink); border-color: var(--paper-hi); color: var(--paper-hi); }
.challenge-spotlight .btn:hover { color: var(--ink); }
@media (max-width: 760px) {
  .challenge-page .band-lg { padding-block: clamp(4.5rem, 11vw, 6rem); }
  .challenge-hero { min-height: 0; }
  .challenge-hero__inner { padding-block: 7rem 3rem; }
  .challenge-hero__title { max-width: none; margin: 1.75rem 0 2rem; font-size: clamp(3.5rem,15vw,6.5rem); line-height: .9; letter-spacing: -.045em; overflow-wrap: normal; }
  .challenge-hero__lead { max-width: 31ch; font-size: clamp(1.25rem,5vw,1.65rem); line-height: 1.35; }
  .challenge-hero__bottom, .challenge-hero__bottom p { display: block; }
  .challenge-hero__bottom { margin-top: 2.25rem; padding-top: 1.5rem; }
  .challenge-hero__bottom strong { font-size: clamp(2.8rem,11vw,4rem); }
  .challenge-hero__bottom span { display: block; max-width: 30ch; margin: .75rem 0 1.75rem; line-height: 1.45; }
  .challenge-hero__bottom .btn { justify-content: center; min-height: 3.25rem; padding: .85em 1.4em; }
  .challenge-how__grid, .challenge-instructor__grid, .challenge-spotlight__grid { grid-template-columns: 1fr; }
  .challenge-included__grid { grid-template-columns: 1fr; }
  .challenge-curriculum__grid { grid-template-columns: 1fr; }
  .challenge-included article { min-height: 0; }
  .challenge-instructor__grid > img { max-height: 25rem; object-position: top; }
  .challenge-spotlight .btn { justify-self: start; }
  .challenge-page .ftr .grid { display: block; }
  .challenge-page .ftr .c5 { margin-top: 3rem; }
}