:root {
  --paper: #f4ece0;
  --paper-2: #ebe1d2;
  --cream: #fffaf2;
  --ink: #1c2430;
  --mute: #5c6572;
  --line: #d7cbb8;
  --terra: #c45c26;
  --terra-deep: #9a4318;
  --forest: #2f6f55;
  --navy: #243044;
  --gold: #c9a227;
  --shadow: 0 20px 50px rgba(28, 36, 48, 0.08);
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Nunito Sans", "Segoe UI", sans-serif;
  --display: "Fraunces", Georgia, serif;
  --max: 1120px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: var(--terra); }
button, .btn { font-family: var(--sans); }

.wrap { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }
.section { padding: 4.5rem 0; }
.eyebrow {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--terra);
  font-weight: 700;
  margin-bottom: 0.7rem;
}
h1, h2, h3 { font-family: var(--display); font-weight: 550; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); line-height: 1.15; margin-bottom: 0.8rem; }
h3 { font-size: 1.2rem; margin-bottom: 0.4rem; }
.lede { color: var(--mute); font-size: 1.08rem; max-width: 40rem; }

.nav {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 1rem;
}
.logo {
  font-family: var(--sans); font-weight: 800; font-size: 0.78rem;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink);
  text-decoration: none;
}
.logo span { color: var(--terra); }
.nav-links { display: flex; gap: 1.1rem; align-items: center; }
.nav-links a {
  font-family: var(--sans); font-size: 0.86rem; color: var(--navy);
  text-decoration: none; font-weight: 600;
}
.nav-toggle {
  display: none; border: 1px solid var(--line); background: transparent;
  height: 36px; padding: 0 0.7rem; border-radius: 8px; cursor: pointer;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0.75rem 1.25rem; border-radius: 999px;
  text-decoration: none; font-weight: 800; letter-spacing: 0.04em;
  text-transform: uppercase; font-size: 0.78rem; border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--terra); color: #fff; }
.btn-primary:hover { background: var(--terra-deep); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--terra); color: var(--terra); }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.4rem; }
.price-note {
  font-family: var(--sans); font-size: 0.82rem; color: var(--mute); margin-top: 0.55rem;
}

.hero { padding: 3.5rem 0 4rem; }
.hero-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 3rem; align-items: center;
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.1rem); line-height: 0.95; margin-bottom: 0.9rem;
}
.hero .sub { font-size: 1.25rem; font-style: italic; color: var(--mute); margin-bottom: 1rem; }
.trust {
  display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 1.3rem;
}
.pill {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.06em;
  text-transform: uppercase; border: 1px solid var(--line); padding: 0.28rem 0.6rem;
  border-radius: 99px; background: var(--cream);
}

.book {
  width: min(100%, 340px); margin: 0 auto; position: relative;
  aspect-ratio: 3 / 4;
  background: linear-gradient(160deg, #2b3544 0%, #1c2430 70%);
  color: #f6efe4; border-radius: 6px 18px 18px 6px;
  padding: 2rem 1.6rem; box-shadow: var(--shadow), 8px 12px 0 rgba(28,36,48,0.08);
  overflow: hidden;
}
.book:before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 14px;
  background: linear-gradient(90deg, #9a4318, #c45c26 40%, transparent);
}
.book .k { font-family: var(--sans); font-size: 0.65rem; letter-spacing: 0.18em; text-transform: uppercase; color: #e08a66; }
.book h2 { font-size: 2rem; color: #fffaf2; margin: 1.2rem 0 0.7rem; }
.book p { color: #d9cbb8; font-size: 0.95rem; font-style: italic; }
.book .by { position: absolute; bottom: 1.5rem; left: 1.8rem; font-family: var(--sans); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; }

.problems { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; margin-top: 1.6rem; }
.problem {
  background: var(--cream); border: 1px solid var(--line); border-radius: 14px; padding: 1.1rem 1.15rem;
}
.problem p { color: var(--mute); font-size: 0.98rem; }

.triangle-wrap {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; margin-top: 1.6rem;
}
.triangle {
  width: min(100%, 360px); margin: 0 auto; aspect-ratio: 1;
  display: grid; place-items: center; position: relative;
}
.node {
  position: absolute; width: 92px; height: 92px; border-radius: 50%;
  display: grid; place-items: center; text-align: center;
  font-family: var(--sans); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.08em;
  text-transform: uppercase; background: var(--cream); border: 2px solid var(--terra); color: var(--navy);
}
.node.ai { top: 8%; left: 50%; transform: translateX(-50%); background: var(--terra); color: #fff; border-color: var(--terra); }
.node.parent { bottom: 10%; left: 8%; }
.node.child { bottom: 10%; right: 8%; }
.tri-lines {
  width: 70%; height: 58%; border-left: 2px solid var(--line); border-right: 2px solid var(--line); border-bottom: 2px solid var(--line);
  transform: rotate(180deg); clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.85rem; margin-top: 1.6rem; }
.card {
  background: var(--cream); border: 1px solid var(--line); border-radius: 14px; padding: 1.15rem 1.2rem;
}
.card h3 {
  font-family: var(--sans); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--terra); margin-bottom: 0.45rem;
}
.card p { color: var(--mute); font-size: 0.95rem; }

.parts { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; margin-top: 1.5rem; }
.part {
  background: var(--cream); border: 1px solid var(--line); border-radius: 14px; padding: 1.1rem 1.2rem;
}
.part strong {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--terra);
  display: block; margin-bottom: 0.35rem;
}
.part ul { margin-left: 1.1rem; color: var(--mute); font-size: 0.95rem; }

.frameworks { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem; margin-top: 1.5rem; }
.fw {
  background: var(--navy); color: #f6efe4; border-radius: 16px; padding: 1.3rem 1.3rem 1.2rem;
}
.fw h3 { color: #e08a66; font-family: var(--sans); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; }
.steps { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.8rem 0 0.7rem; }
.steps span {
  font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.16);
  padding: 0.35rem 0.55rem; border-radius: 99px;
}
.fw p { color: #d9cbb8; font-size: 0.95rem; }

.ages { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.7rem; margin-top: 1.5rem; }
.age {
  background: var(--cream); border-top: 4px solid var(--terra); border-radius: 12px; padding: 1rem;
}
.age b { font-family: var(--sans); font-size: 1.3rem; display: block; }
.age p { color: var(--mute); font-size: 0.9rem; margin-top: 0.35rem; }

.acts { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.7rem; margin-top: 1.4rem; }
.act {
  border: 1px dashed var(--line); border-radius: 12px; padding: 1rem; background: var(--paper-2);
}
.act h3 { font-size: 1.05rem; }

.challenge {
  background: var(--forest); color: #f6efe4; border-radius: 22px; padding: 2rem 1.6rem; margin-top: 1.4rem;
}
.challenge h2, .challenge p { color: #fffaf2; }
.challenge p { opacity: 0.9; }
.days { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.7rem; margin-top: 1.2rem; }
.day {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.14);
  border-radius: 12px; padding: 0.9rem;
}
.day b { font-family: var(--sans); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: #e0c365; }

.cheat { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.7rem; margin-top: 1.4rem; }
.cheat div { background: var(--cream); border-left: 4px solid var(--gold); padding: 0.95rem 1rem; border-radius: 10px; }
.cheat h3 { font-family: var(--sans); font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem; margin-top: 1.4rem; }
.yes, .no { border-radius: 14px; padding: 1.2rem 1.3rem; }
.yes { background: #e8f3ec; }
.no { background: #f8ece6; }
.yes h3 { color: var(--forest); }
.no h3 { color: var(--terra-deep); }
.yes li, .no li { margin-left: 1.1rem; margin-top: 0.35rem; }

.previews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; margin-top: 1.4rem; }
.preview {
  background: var(--cream); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; min-height: 260px;
}
.preview .page {
  padding: 1.1rem 1rem; font-size: 0.78rem; line-height: 1.45; min-height: 220px;
}
.preview .cap {
  font-family: var(--sans); font-size: 0.72rem; padding: 0.55rem 0.8rem; border-top: 1px solid var(--line); color: var(--mute);
}

.outcomes { display: grid; grid-template-columns: 1fr 1fr; gap: 0.55rem 1.2rem; margin-top: 1.2rem; }
.outcomes li { list-style: none; padding-left: 1.3rem; position: relative; }
.outcomes li:before { content: ""; position: absolute; left: 0; top: 0.55rem; width: 8px; height: 8px; border-radius: 50%; background: var(--terra); }

.author {
  display: grid; grid-template-columns: 88px 1fr; gap: 1.1rem; align-items: start;
  background: var(--cream); border: 1px solid var(--line); border-radius: 16px; padding: 1.3rem;
  margin-top: 1.2rem;
}
.avatar {
  width: 88px; height: 88px; border-radius: 50%;
  background: var(--navy); color: #f6efe4; display: grid; place-items: center;
  font-family: var(--display); font-size: 1.6rem;
}

.faq details {
  border-bottom: 1px solid var(--line); padding: 0.9rem 0;
}
.faq summary {
  cursor: pointer; font-family: var(--sans); font-weight: 700; list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq details p { color: var(--mute); margin-top: 0.45rem; }

.offer {
  background: var(--navy); color: #f6efe4; border-radius: 22px; padding: 2.2rem 1.6rem; text-align: center;
}
.offer h2 { color: #fffaf2; }
.offer p { color: #d9cbb8; margin: 0.4rem auto 1rem; max-width: 34rem; }
.offer .btn-primary { background: var(--terra); }
.reassurance {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 0.7rem 1.1rem;
  margin-top: 1.1rem; font-family: var(--sans); font-size: 0.8rem; color: #d9cbb8;
}

.footer {
  border-top: 1px solid var(--line); padding: 2.2rem 0 5.5rem; color: var(--mute); font-size: 0.9rem;
  font-family: var(--sans);
}
.footer a { color: var(--navy); text-decoration: none; margin-right: 1rem; }
.foot-grid { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

.sticky-cta {
  display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  padding: 0.7rem 1rem calc(0.7rem + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  border-top: 1px solid var(--line);
}
.sticky-cta .btn { width: 100%; }

.thanks {
  min-height: 100vh; display: grid; place-items: center; padding: 2rem 1rem 4rem;
}
.thanks-card {
  width: min(560px, 100%); background: var(--cream); border: 1px solid var(--line);
  border-radius: 22px; padding: 2.4rem 1.6rem; text-align: center; box-shadow: var(--shadow);
}
.check {
  width: 72px; height: 72px; margin: 0 auto 1rem; border-radius: 50%;
  background: var(--forest); color: #fff; display: grid; place-items: center;
  font-size: 2rem; font-family: var(--sans);
}

.legal { padding: 6rem 0 4rem; max-width: 42rem; margin: 0 auto; }
.legal p { margin-bottom: 1rem; color: var(--mute); }

@media (max-width: 900px) {
  .hero-grid, .triangle-wrap, .cards, .parts, .frameworks, .ages, .acts, .days, .cheat, .split, .previews, .outcomes {
    grid-template-columns: 1fr 1fr;
  }
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    flex-direction: column; padding: 0.8rem 1rem 1rem; align-items: flex-start;
  }
  .nav-links.open { display: flex; }
  .sticky-cta { display: block; }
}
@media (max-width: 640px) {
  .hero-grid, .problems, .triangle-wrap, .cards, .parts, .frameworks, .ages, .acts, .days, .cheat, .split, .previews, .outcomes {
    grid-template-columns: 1fr;
  }
  .hero { padding-top: 2rem; }
  .author { grid-template-columns: 1fr; }
}