:root {
  --paper: #f4f3ef;
  --paper-2: #ebeae4;
  --ink: #121316;
  --ink-soft: #3a3d45;
  --muted: #6e727a;
  --line: #d5d6dc;
  --white: #fff;
  --graphite: #141518;
  --accent: #2e8b7a;
  --accent-soft: #e7f4f1;
  --accent-ink: #176457;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, system-ui, sans-serif;
  line-height: 1.55;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
.wrap { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 6vw;
  background: rgba(244, 243, 239, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.logo {
  font-family: "Barlow Condensed", sans-serif;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  font-size: 15px;
}
.logo span { color: var(--accent-ink); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  background: var(--graphite);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 10px 16px;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding: 56px 6vw 48px;
}
.kicker {
  margin: 0 0 10px;
  color: var(--accent-ink);
  font-family: "Barlow Condensed", sans-serif;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 13px;
  font-weight: 700;
}
h1, h2, h3 {
  font-family: "Barlow Condensed", sans-serif;
  line-height: 1.05;
  margin: 0 0 14px;
  text-transform: uppercase;
}
h1 { font-size: clamp(36px, 5.4vw, 62px); letter-spacing: -0.02em; }
h2 { font-size: clamp(28px, 4vw, 42px); }
h3 { font-size: 20px; text-transform: none; letter-spacing: 0; }
.lead { color: var(--ink-soft); font-size: 18px; max-width: 540px; margin: 0 0 18px; }
.checks { list-style: none; padding: 0; margin: 0 0 22px; }
.checks li {
  display: flex;
  gap: 10px;
  margin: 8px 0;
  color: var(--ink-soft);
}
.checks b { color: var(--accent-ink); }
.price {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 16px;
}
.price strong {
  font-family: "Barlow Condensed", sans-serif;
  font-size: 42px;
  letter-spacing: -0.03em;
}
.price span { color: var(--muted); font-size: 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  padding: 14px 22px;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.btn.solid { background: var(--accent); color: #fff; }
.btn.solid:hover { background: var(--accent-ink); }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
.btn.full { width: 100%; }
.fine { margin: 0; color: var(--muted); font-size: 13px; }

.hero-visual { display: flex; justify-content: center; }
.book {
  width: min(320px, 100%);
  transform: perspective(1100px) rotateY(-16deg) rotateX(4deg);
  transform-origin: center;
  filter: drop-shadow(18px 22px 28px rgba(20, 21, 24, 0.28));
}
.book img {
  width: 100%;
  border: 1px solid rgba(20, 21, 24, 0.2);
}

.band { padding: 56px 0; }
.band.soft { background: var(--paper-2); }
.band.dark {
  background: var(--graphite);
  color: #fff;
}
.band.dark .lead,
.band.dark .fine { color: rgba(255,255,255,0.72); }
.band.dark h2 { color: #fff; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 22px 22px 20px;
}
.band.dark .card { background: #1c1e22; border-color: #2c2f36; color: #fff; }
.card p { margin: 0; color: var(--ink-soft); }
.band.dark .card p { color: rgba(255,255,255,0.78); }

.inside {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.inside article {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
}
.inside span {
  font-family: "Barlow Condensed", sans-serif;
  color: var(--accent);
  font-size: 22px;
  font-weight: 700;
}
.inside p { margin: 0; }

.bonus {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.bonus article {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  padding: 18px;
}
.bonus h3 { margin-bottom: 6px; }
.bonus p { margin: 0; color: var(--ink-soft); }

.stack {
  display: grid;
  gap: 10px;
  max-width: 560px;
}
.stack-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.cta-box { margin-top: 22px; max-width: 420px; }

.faq details {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 650;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq p { margin: 10px 0 0; color: var(--ink-soft); }

.foot {
  padding: 28px 6vw 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.foot-grid {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.others { display: flex; flex-wrap: wrap; gap: 8px 14px; }
.others a { color: var(--ink-soft); }

@media (max-width: 860px) {
  .hero, .split, .inside, .bonus { grid-template-columns: 1fr; }
  .hero { padding: 32px 6vw 36px; }
  .book { transform: none; width: min(260px, 80%); }
  .nav nav { display: none; }
}