:root {
  --bg: #071824;
  --bg-2: #0a2230;
  --panel: #0d2836;
  --panel-2: #102f3f;
  --text: #f6f2e9;
  --muted: #aab8c1;
  --teal: #43d5ce;
  --gold: #e0a63a;
  --line: rgba(255,255,255,.12);
  --shadow: 0 24px 70px rgba(0,0,0,.35);
  --radius: 22px;
  --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 85% -10%, rgba(67,213,206,.13), transparent 30%),
    radial-gradient(circle at 10% 20%, rgba(224,166,58,.08), transparent 24%),
    var(--bg);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 16px; top: 16px; z-index: 999; background: white; color: #111; padding: 10px 14px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(7,24,36,.88);
  backdrop-filter: blur(14px);
}
.nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark {
  width: 44px; height: 44px; display: grid; place-items: center;
  border: 1px solid rgba(67,213,206,.55); border-radius: 12px;
  font-weight: 800; letter-spacing: .08em; color: var(--teal);
  background: rgba(67,213,206,.06);
}
.brand-text { display: grid; line-height: 1.18; }
.brand-text strong { font-size: .98rem; letter-spacing: .02em; }
.brand-text small { color: var(--muted); font-size: .72rem; margin-top: 3px; }
.site-nav { display: flex; align-items: center; gap: 24px; }
.site-nav a { text-decoration: none; color: #d8e1e5; font-size: .92rem; }
.site-nav a:hover { color: var(--teal); }
.nav-cta { border: 1px solid rgba(67,213,206,.45); border-radius: 999px; padding: 9px 16px; }
.menu-button { display: none; background: transparent; color: white; border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; }

.hero { padding: 92px 0 88px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; gap: 70px; align-items: center; }
.eyebrow { margin: 0 0 14px; color: var(--teal); text-transform: uppercase; letter-spacing: .14em; font-size: .76rem; font-weight: 800; }
h1, h2, h3 { line-height: 1.08; margin-top: 0; }
h1 { font-size: clamp(3rem, 6.3vw, 5.8rem); letter-spacing: -.055em; max-width: 760px; margin-bottom: 26px; }
h2 { font-size: clamp(2.1rem, 4vw, 3.5rem); letter-spacing: -.035em; margin-bottom: 20px; }
h3 { font-size: 1.35rem; margin-bottom: 12px; }
.hero-lede { color: #c8d2d7; font-size: 1.12rem; max-width: 680px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 48px; padding: 0 20px; border-radius: 12px; text-decoration: none; font-weight: 750; transition: transform .2s ease, border-color .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #061419; background: var(--teal); }
.button-secondary { border: 1px solid rgba(255,255,255,.22); color: white; background: rgba(255,255,255,.035); }
.trust-row { display: flex; flex-wrap: wrap; gap: 16px 28px; margin-top: 34px; color: var(--muted); font-size: .86rem; }
.trust-row span::before { content: "•"; color: var(--gold); margin-right: 8px; }

.hero-stack { min-height: 560px; position: relative; perspective: 1200px; }
.cover { position: absolute; width: 240px; aspect-ratio: 1600 / 2560; object-fit: cover; border-radius: 7px; box-shadow: var(--shadow); border: 1px solid rgba(255,255,255,.14); }
.cover-one { left: 4%; top: 85px; transform: rotate(-7deg) translateZ(-30px); }
.cover-two { left: 31%; top: 15px; z-index: 3; width: 260px; }
.cover-three { right: 0; top: 95px; transform: rotate(7deg) translateZ(-25px); }

.credibility-strip { border-block: 1px solid var(--line); background: rgba(255,255,255,.025); }
.credibility-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.credibility-grid > div { padding: 24px 18px; border-right: 1px solid var(--line); }
.credibility-grid > div:last-child { border-right: 0; }
.credibility-grid strong { display: block; color: var(--gold); font-size: 1.15rem; }
.credibility-grid span { color: var(--muted); font-size: .82rem; }

.section { padding: 96px 0; }
.section-alt { background: linear-gradient(180deg, rgba(255,255,255,.025), rgba(255,255,255,.01)); border-block: 1px solid var(--line); }
.section-heading { max-width: 760px; margin-bottom: 48px; }
.section-heading > p:not(.eyebrow) { color: var(--muted); font-size: 1.05rem; }
.section-heading.narrow { max-width: 620px; }
.book-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.book-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; background: linear-gradient(160deg, rgba(255,255,255,.055), rgba(255,255,255,.02)); }
.book-card img { width: 100%; aspect-ratio: 1600/2560; object-fit: cover; border-radius: 12px; box-shadow: 0 16px 38px rgba(0,0,0,.3); }
.book-card-body { padding: 24px 6px 8px; }
.book-topic { color: var(--teal); font-size: .75rem; text-transform: uppercase; letter-spacing: .1em; font-weight: 800; }
.book-card h3 { margin-top: 10px; }
.book-card .subtitle { color: var(--gold); font-size: .92rem; line-height: 1.4; min-height: 2.6em; }
.book-card p { color: #c1cdd2; }
.text-link { color: var(--teal); font-weight: 750; text-decoration: none; }
.text-link:hover { text-decoration: underline; }

.split-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: start; }
.prose { color: #c6d0d5; font-size: 1.04rem; }
.prose strong { color: white; }
.principles-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.principles-grid article { padding: 28px 24px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.025); }
.principle-number { color: var(--gold); font-size: .77rem; font-weight: 800; letter-spacing: .12em; }
.principles-grid h3 { margin-top: 16px; }
.principles-grid p { color: var(--muted); font-size: .92rem; }

.section-author { background: radial-gradient(circle at 12% 50%, rgba(67,213,206,.09), transparent 30%); }
.author-grid { display: grid; grid-template-columns: 250px 1fr; gap: 60px; align-items: center; }
.author-monogram { width: 230px; aspect-ratio: 1; border-radius: 32px; display: grid; place-items: center; font-size: 3.5rem; font-weight: 900; letter-spacing: .09em; color: var(--teal); border: 1px solid rgba(67,213,206,.4); background: linear-gradient(145deg, rgba(67,213,206,.1), rgba(224,166,58,.05)); box-shadow: var(--shadow); }
.author-grid p { color: #c7d1d6; max-width: 760px; }
.accent { color: var(--gold); font-weight: 500; }
.author-grid .button { margin-top: 12px; }

.contact-section { padding-top: 40px; }
.contact-card { display: grid; grid-template-columns: 1.25fr .75fr; gap: 40px; align-items: center; border: 1px solid rgba(67,213,206,.28); border-radius: 28px; padding: 48px; background: linear-gradient(135deg, rgba(67,213,206,.08), rgba(224,166,58,.04)); }
.contact-card h2 { font-size: clamp(1.9rem, 3.5vw, 3rem); }
.contact-card p { color: var(--muted); }
.contact-actions { display: grid; gap: 12px; }

.site-footer { border-top: 1px solid var(--line); padding: 38px 0 44px; color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: start; }
.footer-grid strong { color: white; }
.footer-grid p { margin: 6px 0 0; font-size: .85rem; }
.footer-links { display: flex; gap: 18px; }
.footer-links a { text-decoration: none; color: var(--muted); font-size: .88rem; }
.copyright { grid-column: 1 / -1; border-top: 1px solid var(--line); padding-top: 20px; }

@media (max-width: 900px) {
  .menu-button { display: inline-block; }
  .site-nav { display: none; position: absolute; left: 20px; right: 20px; top: 68px; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: #081b27; box-shadow: var(--shadow); flex-direction: column; align-items: stretch; }
  .site-nav.open { display: flex; }
  .hero-grid, .split-grid, .author-grid, .contact-card { grid-template-columns: 1fr; }
  .hero { padding-top: 64px; }
  .hero-stack { min-height: 460px; max-width: 620px; }
  .cover { width: 200px; }
  .cover-two { width: 220px; }
  .credibility-grid { grid-template-columns: repeat(2, 1fr); }
  .credibility-grid > div:nth-child(2) { border-right: 0; }
  .credibility-grid > div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .book-grid { grid-template-columns: 1fr; max-width: 560px; }
  .book-card { display: grid; grid-template-columns: 160px 1fr; gap: 16px; align-items: start; }
  .book-card-body { padding-top: 8px; }
  .principles-grid { grid-template-columns: repeat(2, 1fr); }
  .author-monogram { width: 190px; }
}

@media (max-width: 620px) {
  .container { width: min(100% - 28px, var(--max)); }
  .brand-text small { display: none; }
  h1 { font-size: clamp(2.55rem, 13vw, 4.2rem); }
  .hero-stack { min-height: 390px; }
  .cover { width: 145px; }
  .cover-two { width: 168px; left: 29%; }
  .credibility-grid { grid-template-columns: 1fr 1fr; }
  .book-card { display: block; }
  .book-card img { max-width: 250px; }
  .book-card .subtitle { min-height: auto; }
  .principles-grid { grid-template-columns: 1fr; }
  .contact-card { padding: 30px 22px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
}