* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0b0f10;
  --bg-soft: #111719;
  --card: #151c1e;
  --text: #f2f4f2;
  --muted: #aab4b2;
  --line: rgba(255, 255, 255, .09);
  --accent: #b7d6c8;
  --max: 1160px;
}

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.narrow { max-width: 780px; }

/* HEADER */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 15, 16, .88);
  backdrop-filter: blur(14px);
}

.nav {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .08em;
}

.brand span {
  font-weight: 500;
  opacity: .65;
}

.nav-link,
.text-link {
  color: var(--muted);
  font-size: 13px;
}

/* HERO */
.hero {
  min-height: 700px;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 78% 48%, rgba(183, 214, 200, .11), transparent 30%),
    linear-gradient(180deg, #0b0f10 0%, #0d1315 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 60px;
  align-items: center;
  padding: 90px 0;
}

.eyebrow,
.section-label {
  display: inline-block;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
}

.hero h1 {
  max-width: 690px;
  margin-top: 18px;
  font-size: clamp(42px, 6vw, 76px);
  line-height: .98;
  letter-spacing: -.055em;
}

.hero h1 strong {
  display: block;
  color: var(--accent);
}

.hero-text {
  max-width: 610px;
  margin-top: 25px;
  color: var(--muted);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 25px;
  margin-top: 34px;
}

.btn {
  border: 0;
  border-radius: 8px;
  padding: 16px 25px;
  font-family: inherit;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .1em;
  cursor: pointer;
  transition: transform .2s ease, opacity .2s ease;
}

.btn-primary {
  background: var(--accent);
  color: #101613;
}

.btn-primary:hover { transform: translateY(-2px); }

.btn.disabled {
  opacity: .65;
  cursor: not-allowed;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  margin-top: 32px;
  color: #8f9a98;
  font-size: 11px;
}

/* EBOOK */
.book-area {
  position: relative;
  min-height: 520px;
  display: grid;
  place-items: center;
}

.glow {
  position: absolute;
  width: 330px;
  height: 330px;
  border-radius: 50%;
  background: rgba(183, 214, 200, .14);
  filter: blur(65px);
}

.book {
  position: relative;
  width: min(320px, 72%);
  aspect-ratio: .7;
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  background: linear-gradient(145deg, #dce7e2, #91a99e);
  color: #17211e;
  box-shadow: 28px 35px 60px rgba(0, 0, 0, .48);
  transform: rotate(5deg);
}

.book-top {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .18em;
}

.book-title {
  margin-top: 70px;
  font-size: 25px;
  line-height: .95;
  font-weight: 800;
  letter-spacing: -.04em;
}

.book-subtitle {
  margin-top: 22px;
  font-size: 12px;
  line-height: 1.5;
  font-weight: 600;
}

.book-line {
  width: 45px;
  height: 2px;
  margin-top: 25px;
  background: #17211e;
}

.book-footer {
  margin-top: auto;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .08em;
}

.book-footer small {
  font-weight: 500;
  letter-spacing: 0;
}

/* SECTIONS */
.intro,
.content-section,
.author {
  padding: 110px 0;
}

.intro {
  background: #f0f3f0;
  color: #111615;
}

.intro .section-label,
.author .section-label {
  color: #52665e;
}

.intro h2,
.section-heading h2,
.highlight h2,
.author h2,
.offer h2 {
  margin-top: 15px;
  font-size: clamp(36px, 5vw, 58px);
  line-height: 1.02;
  letter-spacing: -.05em;
}

.intro h2 span,
.section-heading h2 span,
.highlight h2 span,
.offer h2 span {
  opacity: .5;
}

.intro p {
  margin-top: 24px;
  color: #5d6764;
  font-size: 17px;
}

.content-section { background: var(--bg-soft); }

.section-heading {
  max-width: 700px;
  margin-bottom: 55px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card {
  min-height: 270px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
}

.card-number {
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .1em;
}

.card h3 {
  margin-top: 55px;
  font-size: 20px;
  line-height: 1.15;
}

.card p {
  margin-top: 13px;
  color: var(--muted);
  font-size: 14px;
}

/* HIGHLIGHT */
.highlight {
  padding: 100px 0;
  background: var(--accent);
  color: #13201b;
}

.highlight .section-label { color: #456057; }

.highlight-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  align-items: center;
}

.highlight h2 span { color: #456057; }

.highlight-copy p {
  color: #34453f;
  font-size: 18px;
}

.highlight-copy p + p {
  margin-top: 18px;
  font-size: 14px;
}

/* AUTHOR */
.author { background: #0e1314; }

.author-grid {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 70px;
  align-items: center;
}

.author-photo {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  max-width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(145deg, #202a2a, #121718);
  color: #71817b;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .15em;
  text-align: center;
}

.author h2 { font-size: 48px; }

.author-role {
  margin-top: 8px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

.author-copy > p:not(.author-role) {
  max-width: 650px;
  margin-top: 22px;
  color: var(--muted);
}

/* OFFER */
.offer {
  padding: 110px 0;
  background:
    radial-gradient(circle at 50% 0%, rgba(183, 214, 200, .1), transparent 40%),
    #111719;
}

.offer-box {
  max-width: 850px;
  padding: 65px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #151c1e;
  text-align: center;
}

.offer-box h2 {
  font-size: clamp(38px, 5vw, 58px);
}

.offer-box > p {
  max-width: 600px;
  margin: 22px auto 0;
  color: var(--muted);
}

.offer-items {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 30px 0;
}

.offer-items span {
  padding: 10px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #b7c2bf;
  font-size: 12px;
}

.coming-soon {
  display: block;
  margin-top: 13px;
  color: #697572;
  font-size: 11px;
}

/* FOOTER */
.disclaimer {
  padding: 45px 0;
  background: #090c0d;
}

.disclaimer h3 {
  margin-bottom: 8px;
  font-size: 13px;
}

.disclaimer p {
  color: #697371;
  font-size: 11px;
}

footer {
  border-top: 1px solid var(--line);
  background: #090c0d;
}

.footer-inner {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: #626b69;
  font-size: 10px;
  letter-spacing: .06em;
}

.footer-inner > span:first-child {
  color: #aeb7b4;
  font-weight: 800;
}

/* SOCIAL */
.social-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.social-links a {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: #aeb7b4;
  font-size: 15px;
  transition: .2s ease;
}

.social-links a:hover {
  transform: translateY(-2px);
  color: var(--accent);
  border-color: rgba(183, 214, 200, .45);
  background: rgba(183, 214, 200, .06);
}

/* RESPONSIVE */
@media (max-width: 850px) {
  .hero-grid,
  .highlight-grid,
  .author-grid {
    grid-template-columns: 1fr;
  }

  .hero { min-height: auto; }

  .hero-grid { padding: 70px 0; }

  .book-area { min-height: 430px; }

  .cards { grid-template-columns: repeat(2, 1fr); }

  .highlight-grid,
  .author-grid {
    gap: 40px;
  }

  .author-photo { max-width: 420px; }
}

@media (max-width: 560px) {
  .container {
    width: min(calc(100% - 28px), var(--max));
  }

  .nav-link { display: none; }

  .hero h1 { font-size: 44px; }

  .hero-text { font-size: 15px; }

  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 18px;
  }

  .book-area { min-height: 390px; }

  .book {
    width: 245px;
    padding: 28px 24px;
  }

  .book-title {
    margin-top: 55px;
    font-size: 24px;
  }

  .intro,
  .content-section,
  .author,
  .offer {
    padding: 75px 0;
  }

  .cards { grid-template-columns: 1fr; }

  .card {
    min-height: auto;
  }

  .card h3 { margin-top: 35px; }

  .offer-box { padding: 40px 20px; }

  .footer-inner {
    flex-direction: column;
    justify-content: center;
  }

  .social-links { order: 2; }

  .footer-inner > span:last-child { order: 3; }
}