.book-page {
  overflow: hidden;
}

.book-eyebrow {
  color: var(--primary-gold);
  font-family: var(--header-font-family);
  font-size: var(--font-sm-plus);
  font-weight: 600;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.book-hero {
  background:
    radial-gradient(circle at 18% 40%, rgba(25, 194, 190, 0.12), transparent 32%),
    linear-gradient(135deg, var(--bg-primary) 0%, var(--navy-darker) 100%);
  border-bottom: 1px solid var(--border-color-light);
  padding: 9.5rem 1.25rem 5rem;
  position: relative;
}

.book-hero__grid {
  align-items: center;
  display: grid;
  gap: clamp(3rem, 8vw, 7rem);
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
}

.book-hero__cover-wrap {
  justify-self: center;
  max-width: 360px;
  position: relative;
  width: 100%;
}

.book-hero__glow {
  background: rgba(25, 194, 190, 0.28);
  filter: blur(70px);
  inset: 12% 5%;
  position: absolute;
}

.book-hero__cover {
  border-radius: 3px 10px 10px 3px;
  box-shadow: -14px 18px 45px rgba(0, 0, 0, 0.45), 1px 0 0 rgba(255, 255, 255, 0.16);
  display: block;
  position: relative;
  transform: perspective(1100px) rotateY(4deg);
  width: 100%;
}

.book-hero__content {
  max-width: 690px;
}

.book-hero h1 {
  color: var(--white);
  font-family: var(--header-font-family);
  font-size: clamp(3rem, 6vw, 5.6rem);
  letter-spacing: 0.015em;
  line-height: 1.02;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.book-hero__subtitle {
  color: var(--text-light);
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.6;
  max-width: 650px;
}

.book-hero__author {
  color: var(--text-muted);
  margin-top: 1.25rem;
}

.book-hero__author strong {
  color: var(--white);
}

.book-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.book-actions .btn {
  margin-top: 0;
}

.book-buy-button {
  background: var(--primary-gold);
  color: var(--bg-primary);
}

.book-buy-button:hover,
.book-buy-button:focus {
  background: var(--gold-light);
  border-color: var(--gold-light);
}

.book-intro {
  background: var(--bg-primary);
}

.book-pillars {
  counter-reset: book-pillars;
}

.book-pillars .card {
  min-height: 255px;
}

.book-card__number {
  color: rgba(212, 175, 55, 0.22);
  display: block;
  font-family: var(--header-font-family);
  font-size: 3rem;
  font-weight: 600;
  line-height: 1;
  margin-bottom: 1.25rem;
}

.book-pillars .card-title {
  margin-bottom: 0.85rem;
}

.book-description {
  border-bottom: 1px solid var(--border-color-light);
  border-top: 1px solid var(--border-color-light);
}

.book-description__grid {
  display: grid;
  gap: clamp(3rem, 8vw, 7rem);
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.35fr);
}

.book-description__heading {
  align-self: start;
  position: sticky;
  top: 9rem;
}

.book-description__heading h2,
.book-audience h2 {
  color: var(--white);
  font-family: var(--header-font-family);
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1.08;
  text-transform: uppercase;
}

.book-description__lead {
  border-left: 2px solid var(--primary-gold);
  color: var(--text-light);
  font-size: var(--font-lg);
  margin-top: 1.75rem;
  padding-left: 1.25rem;
}

.book-description__copy {
  color: var(--text-gray);
  font-size: var(--font-lg);
  line-height: 1.85;
}

.book-description__copy p + p {
  margin-top: 1.5rem;
}

.book-description__copy em {
  color: var(--white);
}

.book-audience {
  background: var(--bg-primary);
}

.book-audience__panel {
  align-items: center;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  border: 1px solid var(--border-color);
  border-radius: 16px;
  display: flex;
  gap: 3rem;
  justify-content: space-between;
  overflow: hidden;
  padding: clamp(2rem, 5vw, 4rem);
  position: relative;
}

.book-audience__panel::after {
  background: var(--primary-gold);
  content: "";
  height: 1px;
  opacity: 0.65;
  position: absolute;
  right: -3rem;
  top: 2rem;
  transform: rotate(-35deg);
  width: 15rem;
}

.book-audience__panel p:not(.book-eyebrow) {
  color: var(--text-light);
  margin-top: 1rem;
  max-width: 680px;
}

.book-audience__panel .btn {
  flex-shrink: 0;
  margin-top: 0;
  position: relative;
  z-index: 1;
}

.book-home {
  border-bottom: 1px solid var(--border-color-light);
  border-top: 1px solid var(--border-color-light);
}

.book-home__card {
  align-items: center;
  display: grid;
  gap: clamp(2rem, 6vw, 5rem);
  grid-template-columns: minmax(180px, 290px) minmax(0, 1fr);
  margin: 0 auto;
  max-width: 1000px;
  padding: clamp(2rem, 5vw, 4rem);
}

.book-home__cover-wrap {
  filter: drop-shadow(0 18px 25px rgba(0, 0, 0, 0.34));
}

.book-home__cover {
  border-radius: 2px 7px 7px 2px;
  display: block;
  width: 100%;
}

.book-home__title {
  color: var(--white);
  font-family: var(--header-font-family);
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  letter-spacing: 0.02em;
  line-height: 1.1;
  text-transform: uppercase;
}

.book-home__subtitle {
  color: var(--gold-light);
  font-size: var(--font-xl-plus);
  line-height: 1.55;
  margin: 1rem 0;
}

.book-text-link {
  font-weight: 600;
  padding: 0.75rem 0;
}

.book-text-link:hover,
.book-text-link:focus {
  color: var(--gold-light);
}

@media (max-width: 768px) {
  .book-hero {
    padding: 7.5rem 1rem 3.5rem;
  }

  .book-hero__grid,
  .book-description__grid,
  .book-home__card {
    grid-template-columns: 1fr;
  }

  .book-hero__cover-wrap {
    max-width: 255px;
  }

  .book-hero__content,
  .book-description__heading,
  .book-home__content {
    text-align: center;
  }

  .book-hero h1 {
    font-size: clamp(2.7rem, 12vw, 4rem);
  }

  .book-actions {
    justify-content: center;
  }

  .book-description__heading {
    position: static;
  }

  .book-description__lead {
    border-left: 0;
    border-top: 2px solid var(--primary-gold);
    padding-left: 0;
    padding-top: 1.25rem;
  }

  .book-audience__panel {
    align-items: flex-start;
    flex-direction: column;
  }

  .book-home__cover-wrap {
    justify-self: center;
    max-width: 220px;
  }
}

@media (max-width: 480px) {
  .book-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .book-actions .btn {
    width: 100%;
  }

  .book-home__card {
    padding: 1.5rem;
  }

  .book-description__copy {
    font-size: var(--font-md);
  }
}