:root {
  --bg: #07100b;
  --bg-soft: #0c1811;
  --panel: #102117;
  --panel-2: #14271b;
  --green: #839b79;
  --green-bright: #a8bf9e;
  --cream: #f3efe4;
  --muted: #b9c2b8;
  --line: rgba(227, 236, 222, .12);
  --shadow: 0 24px 70px rgba(0,0,0,.35);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--cream);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.shell { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7,16,11,.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.nav-wrap { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: flex; flex-direction: column; line-height: 1.05; }
.brand-mark { font-weight: 850; letter-spacing: .13em; font-size: 1.05rem; }
.brand-sub { margin-top: 6px; color: var(--muted); font-size: .72rem; letter-spacing: .03em; }
.site-nav { display: flex; align-items: center; gap: 24px; font-size: .92rem; }
.site-nav a { color: #dce3da; }
.site-nav a:hover { color: white; }
.nav-cta { padding: 10px 16px; border: 1px solid rgba(168,191,158,.55); border-radius: 999px; }
.nav-toggle { display: none; }

.hero { overflow: hidden; padding: 84px 0 70px; background: radial-gradient(circle at 78% 38%, rgba(90,125,76,.18), transparent 32%), linear-gradient(180deg, #07100b 0%, #09140d 100%); }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.eyebrow { margin: 0 0 18px; color: var(--green-bright); font-size: .78rem; font-weight: 800; letter-spacing: .18em; }
h1,h2,h3,p { margin-top: 0; }
h1 { margin-bottom: 24px; font-size: clamp(3.1rem, 5.4vw, 5.55rem); line-height: .95; letter-spacing: -.05em; max-width: 760px; }
h1 span { color: var(--green-bright); }
.hero-lede { max-width: 700px; color: #d5ddd3; font-size: clamp(1.08rem, 1.55vw, 1.28rem); }
.hero-kicker { margin: 28px 0 0; font-family: Georgia, serif; font-style: italic; color: #aebca9; font-size: 1.05rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 0 22px; border-radius: 6px; font-weight: 750; transition: transform .18s ease, background .18s ease, border-color .18s ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { background: var(--green); color: #07100b; }
.button.primary:hover { background: var(--green-bright); }
.button.secondary { border: 1px solid rgba(230,237,226,.25); color: white; }
.button.secondary:hover { border-color: rgba(230,237,226,.5); }
.format-links { display: flex; gap: 9px; margin-top: 18px; color: #95a494; font-size: .88rem; }
.format-links a { color: #dce8d7; text-decoration: underline; text-underline-offset: 3px; }
.hero-art { position: relative; min-height: 560px; display: grid; place-items: center; }
.book-glow { position: absolute; width: 75%; aspect-ratio: 1; border-radius: 50%; background: rgba(109,142,91,.22); filter: blur(55px); }
.hero-art img { position: relative; width: min(560px, 100%); filter: drop-shadow(0 28px 35px rgba(0,0,0,.42)); }

.proof-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #0b160f; }
.proof-grid { display: grid; grid-template-columns: repeat(3,1fr); }
.proof-grid > div { min-height: 125px; padding: 28px 32px; border-right: 1px solid var(--line); display: flex; flex-direction: column; justify-content: center; }
.proof-grid > div:last-child { border-right: 0; }
.proof-grid strong { font-family: Georgia, serif; font-size: 1.05rem; font-weight: 500; }
.proof-grid span { margin-top: 8px; color: #899a88; font-size: .82rem; }

.section { padding: 104px 0; }
.split-section { background: #0a140e; }
.split-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 86px; }
.section-heading h2 { margin-bottom: 20px; font-size: clamp(2.35rem, 4.2vw, 4rem); line-height: 1.04; letter-spacing: -.04em; }
.section-heading > p:last-child { color: var(--muted); max-width: 680px; font-size: 1.05rem; }
.centered { max-width: 800px; text-align: center; margin: 0 auto 50px; }
.centered > p:last-child { margin-left: auto; margin-right: auto; }
.section-copy { font-size: 1.08rem; color: #c6d0c3; }
.section-copy p { margin-bottom: 24px; }
.callout { margin-top: 36px; padding: 24px 26px; border-left: 3px solid var(--green); background: rgba(123,151,111,.08); color: white; font-family: Georgia, serif; font-size: 1.12rem; }

.cfo-section { background: linear-gradient(180deg,#0b170f,#09130d); }
.cards { display: grid; gap: 18px; }
.four-up { grid-template-columns: repeat(4,1fr); }
.three-up { grid-template-columns: repeat(3,1fr); }
.feature-card, .audience-card { background: linear-gradient(180deg,rgba(22,44,30,.95),rgba(13,29,19,.95)); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.card-number { display: inline-block; margin-bottom: 35px; color: var(--green-bright); font-size: .78rem; font-weight: 850; letter-spacing: .12em; }
.feature-card h3, .audience-card h3 { margin-bottom: 12px; font-size: 1.3rem; }
.feature-card p, .audience-card p { margin-bottom: 0; color: #aebaaa; font-size: .95rem; }

.learn-section { background: #07100b; }
.learn-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: start; }
.topic-grid { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); }
.topic-grid div { padding: 20px 16px; border-bottom: 1px solid var(--line); color: #d8e0d5; }
.topic-grid div:nth-child(odd) { border-right: 1px solid var(--line); }
.topic-grid div::before { content: "→"; color: var(--green-bright); margin-right: 12px; }

.audience-section { background: #0d1912; }
.reviews-section { background: #07100b; }
.review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.review-card { margin: 0; min-height: 265px; padding: 28px; background: #0e1d14; border: 1px solid var(--line); border-radius: var(--radius); display: flex; flex-direction: column; justify-content: space-between; }
.review-card.featured { background: linear-gradient(145deg,#193220,#102117); }
.review-card p { font-family: Georgia, serif; color: #e7ece4; font-size: 1.07rem; }
.review-card footer { color: var(--green-bright); font-size: .88rem; font-weight: 750; }
.review-card footer span { display: block; color: #7f9080; font-weight: 500; margin-top: 3px; }

.author-section { background: #0c1710; }
.author-grid { display: grid; grid-template-columns: 280px 1fr; gap: 70px; align-items: center; }
.author-badge { aspect-ratio: 1; border-radius: 50%; display: grid; place-items: center; background: radial-gradient(circle at 35% 30%,#52704e,#17291c 58%,#0a130d 100%); border: 1px solid rgba(168,191,158,.22); box-shadow: var(--shadow); }
.author-badge span { font-family: Georgia, serif; font-size: 4rem; letter-spacing: -.06em; }
.author-copy { max-width: 720px; }
.author-copy h2 { margin-bottom: 20px; font-size: 3rem; letter-spacing: -.04em; }
.author-copy p { color: #bdc8ba; font-size: 1.04rem; }
.text-link { display: inline-block; margin-top: 12px; color: var(--green-bright); font-weight: 700; }

.final-cta { padding: 100px 0; background: #07100b; }
.cta-box { padding: 64px 40px; text-align: center; background: radial-gradient(circle at 50% 0%,rgba(128,159,113,.2),transparent 50%),#102117; border: 1px solid rgba(168,191,158,.2); border-radius: 24px; }
.cta-box h2 { margin-bottom: 14px; font-size: clamp(2.7rem,5vw,4.8rem); letter-spacing: -.05em; }
.cta-box > p:not(.eyebrow) { max-width: 650px; margin: 0 auto; color: #b9c5b6; font-size: 1.08rem; }
.centered-actions { justify-content: center; }

.site-footer { border-top: 1px solid var(--line); padding: 34px 0; background: #050c08; }
.footer-grid { display: flex; justify-content: space-between; gap: 30px; align-items: flex-end; color: #9cab9b; font-size: .85rem; }
.footer-grid strong { color: white; }
.footer-grid p { margin: 4px 0 0; }
.footer-right { display: flex; flex-direction: column; align-items: flex-end; gap: 5px; }
.footer-right a { color: #dbe4d8; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: .08s; }
.delay-2 { transition-delay: .16s; }
.delay-3 { transition-delay: .24s; }

@media (max-width: 980px) {
  .site-nav { position: absolute; display: none; flex-direction: column; align-items: stretch; top: 78px; left: 20px; right: 20px; padding: 20px; background: #0d1912; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
  .site-nav.open { display: flex; }
  .nav-toggle { display: inline-flex; background: transparent; color: white; border: 1px solid var(--line); border-radius: 7px; padding: 9px 12px; }
  .hero-grid, .split-grid, .learn-grid { grid-template-columns: 1fr; }
  .hero-art { min-height: 470px; }
  .hero-art img { width: min(360px, 90%); }
  .four-up { grid-template-columns: 1fr 1fr; }
  .review-grid { grid-template-columns: 1fr 1fr; }
  .author-grid { grid-template-columns: 220px 1fr; gap: 44px; }
}

@media (max-width: 680px) {
  .shell { width: min(100% - 28px, 1180px); }
  .brand-sub { display: none; }
  .hero { padding-top: 58px; }
  h1 { font-size: clamp(3rem, 16vw, 4.6rem); }
  .hero-grid { gap: 26px; }
  .hero-art { min-height: 360px; }
  .hero-art img { width: 300px; }
  .proof-grid { grid-template-columns: 1fr; }
  .proof-grid > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .proof-grid > div:last-child { border-bottom: 0; }
  .section { padding: 76px 0; }
  .four-up, .three-up, .review-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-grid div:nth-child(odd) { border-right: 0; }
  .author-grid { grid-template-columns: 1fr; }
  .author-badge { width: 180px; }
  .footer-grid { flex-direction: column; align-items: flex-start; }
  .footer-right { align-items: flex-start; }
}