:root {
  color-scheme: light;
  --ink: #172329;
  --muted: #526268;
  --yellow: #ffe16a;
  --coral: #f6745b;
  --teal: #147e78;
  --paper: #fff;
  --mist: #f1f7f5;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Arial, Helvetica, sans-serif; letter-spacing: 0; }
a { color: inherit; }
img { display: block; max-width: 100%; }
.wrap { width: min(100% - 44px, 1100px); margin-inline: auto; }

.site-header { background: var(--yellow); border-bottom: 2px solid var(--ink); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.book-name { font-size: 16px; font-weight: 800; text-decoration: none; max-width: 20ch; line-height: 1.1; }
.maker { color: #3a3b31; font-size: 13px; font-weight: 700; white-space: nowrap; }

.intro { background: var(--yellow); }
.intro-inner { padding-block: 56px 68px; }
.accent-rule { width: 57px; height: 7px; background: var(--coral); margin-bottom: 22px; }
.eyebrow { margin: 0 0 12px; color: var(--teal); text-transform: uppercase; font-size: 12px; font-weight: 800; line-height: 1.3; }
h1, h2, p { overflow-wrap: break-word; }
h1 { max-width: 840px; margin: 0; font-size: clamp(38px, 5vw, 70px); line-height: 1.02; font-weight: 900; }
.lede { max-width: 670px; margin: 22px 0 28px; font-size: 18px; line-height: 1.5; }
.primary-action { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 13px 22px; background: var(--ink); color: white; border: 2px solid var(--ink); border-radius: 4px; font-size: 15px; font-weight: 800; text-decoration: none; }
.primary-action:hover, .primary-action:focus-visible { background: var(--teal); border-color: var(--teal); }
.print-note { margin: 12px 0 0; color: #3e463e; font-size: 12px; }

.preview-band { background: var(--mist); border-block: 1px solid #d5e6e1; }
.preview-layout { display: grid; grid-template-columns: 1fr minmax(220px, 360px); align-items: center; gap: 60px; padding-block: 75px; }
.preview-copy h2, .section-heading h2, .brothers-inner h2 { margin: 0 0 19px; font-size: clamp(28px, 3vw, 42px); line-height: 1.08; }
.preview-copy p:not(.eyebrow), .brothers-inner p:not(.eyebrow):not(.signature):not(.book-callout) { max-width: 550px; font-size: 16px; line-height: 1.6; }
.preview-image { display: block; background: white; box-shadow: 0 16px 40px #142c2a20; transform: rotate(2deg); transition: transform .2s ease; }
.preview-image:hover, .preview-image:focus-visible { transform: rotate(0deg); }
.preview-image img { width: 100%; height: auto; }

.challenge-section { padding-block: 78px 85px; }
.section-heading { margin-bottom: 25px; }
.challenge-list { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--ink); }
.challenge-list li { display: grid; grid-template-columns: 60px 1fr; gap: 18px; padding: 21px 0; border-bottom: 1px solid #cbd4d2; }
.challenge-list .number { color: var(--coral); font-size: 22px; font-weight: 900; }
.challenge-list strong { display: block; font-size: 19px; line-height: 1.2; }
.challenge-list small { display: block; margin-top: 7px; color: var(--muted); font-size: 14px; line-height: 1.4; }

.brothers-band { background: #e9f1ef; border-top: 2px solid var(--ink); }
.brothers-inner { display: grid; grid-template-columns: 1.5fr .7fr; align-items: end; gap: 80px; padding-block: 67px; }
.signature { margin: 24px 0 0; color: var(--teal); font-size: 24px; font-weight: 900; }
.book-callout { margin: 0; padding-left: 22px; border-left: 6px solid var(--coral); font-size: 19px; font-weight: 800; line-height: 1.3; }
.site-footer { background: var(--ink); color: #e7f1ed; }
.footer-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 18px; font-size: 12px; }

@media (max-width: 700px) {
  .wrap { width: min(100% - 30px, 1100px); }
  .header-inner { min-height: 66px; }
  .book-name { font-size: 14px; }
  .maker { font-size: 11px; }
  .intro-inner { padding-block: 41px 46px; }
  h1 { font-size: 42px; }
  .lede { font-size: 16px; }
  .primary-action { width: 100%; }
  .preview-layout { grid-template-columns: 1fr; gap: 28px; padding-block: 55px; }
  .preview-image { width: min(75%, 300px); margin-inline: auto; }
  .challenge-section { padding-block: 55px; }
  .challenge-list li { grid-template-columns: 43px 1fr; gap: 12px; }
  .brothers-inner { grid-template-columns: 1fr; gap: 31px; padding-block: 51px; }
  .footer-inner { min-height: 92px; flex-direction: column; align-items: start; justify-content: center; gap: 7px; }
}

@media (max-width: 370px) {
  .maker { white-space: normal; text-align: right; max-width: 90px; }
  h1 { font-size: 37px; }
}