:root {
  --paper: #f5e7bd;
  --paper-light: #fff9e8;
  --ink: #142d27;
  --forest: #275f50;
  --forest-deep: #173b32;
  --rust: #c65b32;
  --gold: #d59b38;
  --muted: #687066;
  --line: rgba(20, 45, 39, 0.23);
  --shadow: rgba(20, 45, 39, 0.18);
  --shell: min(1160px, calc(100% - 40px));
  --heading: "Arial Narrow", "Roboto Condensed", Impact, sans-serif;
  --body: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: clip; }
body { margin: 0; overflow-x: clip; color: var(--ink); background: var(--paper-light); font-family: var(--body); font-size: 18px; line-height: 1.65; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 4px; }
.shell { width: var(--shell); margin-inline: auto; }
.narrow { max-width: 860px; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 10px 16px; background: var(--ink); color: white; transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.eyebrow { margin: 0 0 14px; color: var(--rust); font: 800 0.76rem/1.2 var(--heading); letter-spacing: 0.15em; text-transform: uppercase; }
h1, h2, h3 { margin-top: 0; font-family: var(--heading); line-height: 0.98; letter-spacing: -0.025em; }
h1 { max-width: 780px; margin-bottom: 24px; font-size: clamp(3.2rem, 7vw, 6.8rem); text-transform: uppercase; }
h1 em { color: var(--forest); font-style: normal; }
h2 { max-width: 820px; margin-bottom: 26px; font-size: clamp(2.5rem, 5vw, 5rem); text-transform: uppercase; }
h3 { font-size: 1.45rem; }
p { margin-top: 0; }
.section-rule { border-top: 1px solid var(--line); }
.button { display: inline-flex; min-height: 52px; align-items: center; justify-content: center; padding: 13px 22px; border: 2px solid var(--forest-deep); border-radius: 2px; background: var(--rust); color: #fffdf5; font: 800 0.9rem/1 var(--heading); letter-spacing: 0.04em; text-decoration: none; text-transform: uppercase; cursor: pointer; box-shadow: 5px 5px 0 var(--forest-deep); transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease; }
.button:hover { background: #a94322; transform: translate(2px, 2px); box-shadow: 3px 3px 0 var(--forest-deep); }
.button-small { min-height: 40px; padding: 9px 15px; box-shadow: 3px 3px 0 var(--forest-deep); font-size: 0.75rem; }
.button-light { border-color: var(--paper-light); background: var(--paper-light); color: var(--forest-deep); box-shadow: 5px 5px 0 var(--rust); }
.button-amazon { border-color: #2f2b23; background: #f3a847; color: #1a1712; box-shadow: 5px 5px 0 #2f2b23; cursor: not-allowed; opacity: 0.8; }
.button-amazon span { padding-left: 9px; border-left: 1px solid rgba(26,23,18,0.35); font-size: 0.66rem; }
.button-amazon:hover { background: #f3a847; transform: none; box-shadow: 5px 5px 0 #2f2b23; }
.button-amazon-dark { border-color: var(--paper-light); box-shadow: 5px 5px 0 var(--rust); }
.text-link { font: 800 0.86rem/1 var(--heading); letter-spacing: 0.05em; text-transform: uppercase; text-underline-offset: 6px; }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(255, 249, 232, 0.96); backdrop-filter: blur(10px); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.wordmark { max-width: 180px; font: 900 1rem/0.9 var(--heading); letter-spacing: -0.02em; text-decoration: none; text-transform: uppercase; }
.wordmark span { color: var(--rust); }
.site-nav { display: flex; align-items: center; gap: 24px; }
.site-nav > a:not(.button) { font: 700 0.76rem/1 var(--heading); letter-spacing: 0.06em; text-decoration: none; text-transform: uppercase; }
.site-nav > a:not(.button):hover { color: var(--rust); }
.menu-button { display: none; min-height: 44px; align-items: center; gap: 8px; border: 0; background: transparent; color: var(--ink); font: 800 0.76rem/1 var(--heading); text-transform: uppercase; }
.menu-icon, .menu-icon::before, .menu-icon::after { display: block; width: 20px; height: 2px; background: currentColor; content: ""; }
.menu-icon { position: relative; }
.menu-icon::before { position: absolute; top: -6px; }
.menu-icon::after { position: absolute; top: 6px; }

.hero { padding: clamp(54px, 8vw, 110px) 0 84px; overflow: hidden; background: var(--paper); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(290px, 0.65fr); align-items: center; gap: clamp(48px, 8vw, 110px); }
.hero-lede { max-width: 700px; margin-bottom: 30px; font-size: clamp(1.15rem, 2vw, 1.42rem); }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; }
.proof-strip { display: flex; flex-wrap: wrap; gap: 12px 28px; margin: 44px 0 15px; padding: 20px 0 0; border-top: 1px solid var(--line); list-style: none; font: 700 0.78rem/1.2 var(--heading); letter-spacing: 0.04em; text-transform: uppercase; }
.proof-strip strong { display: block; color: var(--rust); font-size: 1.55rem; }
.boundary-note { max-width: 680px; margin: 0; color: var(--muted); font-size: 0.83rem; }
.cover-stage { position: relative; width: min(380px, 100%); margin: 0 auto; }
.cover-stage img { position: relative; z-index: 2; border: 1px solid rgba(20, 45, 39, 0.36); box-shadow: 18px 22px 32px var(--shadow); }
.cover-shadow { position: absolute; inset: 24px -20px -20px 24px; z-index: 1; border: 2px solid var(--forest); background: var(--rust); }
.cover-stage figcaption { margin-top: 28px; color: var(--muted); font: 700 0.72rem/1 var(--heading); letter-spacing: 0.13em; text-align: center; text-transform: uppercase; }

@media (min-width: 961px) and (min-height: 760px) {
  .hero { min-height: calc(100vh - 72px); display: grid; align-items: center; padding: clamp(30px, 4vh, 44px) 0; }
  .hero-grid { grid-template-columns: minmax(0, 1.3fr) minmax(290px, 0.7fr); gap: clamp(48px, 5vw, 78px); }
  .hero h1 { max-width: 720px; margin-bottom: 16px; font-size: clamp(4.2rem, 4.6vw, 5.1rem); }
  .hero-lede { margin-bottom: 18px; font-size: 1.1rem; line-height: 1.5; }
  .hero-actions { gap: 16px; }
  .proof-strip { gap: 10px 24px; margin: 22px 0 9px; padding-top: 13px; }
  .proof-strip strong { font-size: 1.3rem; }
  .boundary-note { font-size: 0.76rem; line-height: 1.45; }
  .cover-stage { width: min(330px, 100%); }
  .cover-stage figcaption { margin-top: 18px; }
}

.recognition, .difference, .roadmap, .fit, .faq { padding: clamp(78px, 10vw, 140px) 0; }
.signal-list { margin: 52px 0; border-top: 1px solid var(--line); }
.signal-list p { display: grid; grid-template-columns: 60px 1fr; gap: 20px; margin: 0; padding: 22px 0; border-bottom: 1px solid var(--line); font-size: 1.08rem; }
.signal-list span { color: var(--rust); font: 900 0.86rem/1.6 var(--heading); }
.pull-quote { margin: 58px 0 0; padding-left: 28px; border-left: 7px solid var(--rust); font: 700 clamp(1.35rem, 3vw, 2.2rem)/1.25 var(--body); }

.diagnostic { padding: clamp(78px, 10vw, 130px) 0; background: var(--forest-deep); color: #fff8e5; }
.diagnostic-grid { display: grid; grid-template-columns: minmax(260px, 0.75fr) minmax(0, 1.25fr); gap: clamp(48px, 8vw, 100px); align-items: start; }
.diagnostic-art { max-width: 360px; margin-top: 38px; border: 7px solid var(--paper); transform: rotate(-1deg); }
.diagnostic-form { display: grid; gap: 26px; }
.diagnostic-form fieldset { margin: 0; padding: 24px; border: 1px solid rgba(255,255,255,0.28); }
.diagnostic-form legend { padding: 0 10px; font: 800 1rem/1.2 var(--heading); text-transform: uppercase; }
.diagnostic-form label { display: flex; gap: 12px; align-items: flex-start; padding: 10px; cursor: pointer; }
.diagnostic-form label:hover { background: rgba(255,255,255,0.07); }
.diagnostic-form input { width: 20px; height: 20px; flex: 0 0 auto; accent-color: var(--rust); }
.form-error { min-height: 1.5em; margin: -10px 0 0; color: #ffd47e; font-weight: 700; }
.diagnostic-result { padding: 24px; border: 2px solid var(--gold); background: #fff8e5; color: var(--ink); }
.diagnostic-result h3 { margin-bottom: 10px; color: var(--rust); text-transform: uppercase; }
.diagnostic-result p:last-child { margin-bottom: 0; }

.comparison { display: grid; grid-template-columns: 1fr 1fr; margin-top: 52px; border: 1px solid var(--line); }
.comparison-side { padding: clamp(30px, 5vw, 58px); }
.comparison-side + .comparison-side { border-left: 1px solid var(--line); }
.comparison-side h3 { margin-bottom: 26px; text-transform: uppercase; }
.comparison-side ul, .not-for ul { margin: 0; padding: 0; list-style: none; }
.comparison-side li { position: relative; padding: 14px 0 14px 32px; border-top: 1px solid var(--line); }
.comparison-side li::before { position: absolute; left: 0; content: "×"; color: var(--rust); font: 900 1.2rem/1 var(--heading); }
.strong-side { background: var(--paper); }
.strong-side li::before { content: "✓"; color: var(--forest); }
.muted-side { color: var(--muted); }

.method { padding: clamp(78px, 10vw, 130px) 0; background: var(--paper); }
.method-steps { display: grid; grid-template-columns: repeat(4, 1fr); margin: 55px 0 0; padding: 0; border-top: 3px solid var(--ink); list-style: none; }
.method-steps li { padding: 30px 22px 0 0; }
.method-steps span { display: grid; width: 54px; height: 54px; place-items: center; margin-top: -58px; border: 3px solid var(--ink); border-radius: 50%; background: var(--rust); color: white; font: 900 1.45rem/1 var(--heading); }
.method-steps li:nth-child(even) span { background: var(--forest); }
.method-steps h3 { margin: 24px 0 12px; text-transform: uppercase; }
.method-steps p { margin: 0; font-size: 0.9rem; }

.roadmap-grid { display: grid; grid-template-columns: 1fr minmax(300px, 0.7fr); gap: clamp(50px, 8vw, 100px); align-items: center; }
.roadmap-grid > * { min-width: 0; }
.roadmap-grid > img { width: min(100%, 430px); justify-self: end; border: 1px solid var(--line); box-shadow: 14px 16px 0 var(--forest); }
.check-list { margin: 34px 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; padding: 12px 0 12px 34px; border-top: 1px solid var(--line); }
.check-list li::before { position: absolute; left: 0; content: "●"; color: var(--rust); }

.models { padding: clamp(78px, 10vw, 130px) 0; background: var(--forest-deep); color: #fff8e5; }
.model-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 48px; border: 1px solid rgba(255,255,255,0.28); }
.model-grid article { min-height: 280px; padding: 28px; }
.model-grid article + article { border-left: 1px solid rgba(255,255,255,0.28); }
.model-grid span { color: var(--gold); font: 900 0.78rem/1 var(--heading); }
.model-grid h3 { margin: 42px 0 18px; text-transform: uppercase; }
.model-grid p { margin: 0; font-size: 0.92rem; }
.center-note { margin: 32px auto 0; text-align: center; font-style: italic; }

.fit-grid { display: grid; grid-template-columns: 1fr 0.75fr; gap: clamp(50px, 8vw, 100px); align-items: start; }
.fit-grid > div > img { width: min(100%, 430px); margin: 38px auto 0; border: 1px solid var(--line); box-shadow: 14px 16px 0 var(--forest); }
.not-for { padding: 34px; border: 2px solid var(--rust); background: var(--paper); }
.not-for h3 { color: var(--rust); text-transform: uppercase; }
.not-for li { padding: 9px 0; border-bottom: 1px solid var(--line); }
.not-for p { margin: 28px 0 0; font-size: 0.83rem; }

.evidence { padding: 70px 0; background: var(--rust); color: #fff8e5; }
.evidence-grid { display: grid; grid-template-columns: 0.4fr 1fr; gap: 60px; align-items: center; }
.evidence-number { margin: 0; font: 900 clamp(7rem, 15vw, 12rem)/0.8 var(--heading); }
.evidence h2 { max-width: 760px; font-size: clamp(2.2rem, 5vw, 4.4rem); }

.faq-list { margin-top: 42px; border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 24px 46px 24px 0; font: 800 1.05rem/1.25 var(--heading); cursor: pointer; text-transform: uppercase; }
.faq-list summary::after { position: absolute; right: 8px; content: "+"; color: var(--rust); font-size: 1.5rem; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { padding: 0 48px 24px 0; }

.final-cta { padding: clamp(80px, 11vw, 150px) 0; overflow: hidden; background: var(--forest-deep); color: #fff8e5; }
.final-grid { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 40px; }
.final-cta h2 { max-width: 900px; }
.final-cta p { max-width: 700px; }
.availability { margin-top: 28px; color: rgba(255,255,255,0.72); font-size: 0.78rem; }
.final-mark { margin: 0 -40px -54px 0; color: rgba(255,255,255,0.07); font: 900 clamp(8rem, 18vw, 15rem)/0.7 var(--heading); writing-mode: vertical-rl; }
.site-footer { padding: 34px 0; background: #0e2721; color: rgba(255,255,255,0.78); }
.footer-inner { display: flex; justify-content: space-between; gap: 30px; font-size: 0.75rem; }
.footer-inner p { margin: 0; }

.sample-header { border-bottom: 1px solid var(--line); background: var(--paper-light); }
.sample-header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.sample-hero { padding: clamp(60px, 8vw, 105px) 0; background: var(--paper); }
.sample-hero-grid { display: grid; grid-template-columns: 1fr 170px; align-items: center; gap: 70px; }
.sample-hero-grid > * { min-width: 0; }
.sample-hero img { border: 1px solid var(--line); box-shadow: 10px 12px 0 var(--rust); }
.book-sample { max-width: 780px; padding-top: 85px; padding-bottom: 100px; }
.book-sample h2 { margin: 38px 0 35px; font-size: clamp(2.4rem, 4vw, 4rem); }
.book-sample p { margin-bottom: 1.35em; }
.book-sample blockquote { margin: 42px 0; padding: 24px 0 24px 28px; border-left: 7px solid var(--rust); font-size: clamp(1.25rem, 2vw, 1.7rem); font-weight: 700; }
.book-sample hr { margin: 70px 0; border: 0; border-top: 1px solid var(--line); }
.book-sample sup a { color: var(--rust); font-weight: 700; }
.running-head { color: var(--rust); font: 800 0.75rem/1.2 var(--heading); letter-spacing: 0.14em; text-transform: uppercase; }
.sample-exercise { margin: 30px 0; padding-left: 23px; }
.sample-exercise li { margin-bottom: 14px; }
.sample-note { margin-top: 55px; padding: 28px; border: 1px solid var(--line); background: var(--paper); font-size: 0.82rem; }
.sample-note h3 { color: var(--rust); text-transform: uppercase; }
.sample-note p { margin: 0; }
.sample-end { padding: 75px 0; background: var(--forest-deep); color: #fff8e5; }
.sample-end-grid { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 55px; }
.sample-end h2 { max-width: 760px; font-size: clamp(2.2rem, 4vw, 3.8rem); }
.sample-end p { max-width: 700px; }
.sample-end-actions { display: grid; gap: 17px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
}