.book-page {
  display: flex;
  min-height: 100dvh;
  flex-direction: column;
}

.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.book-language-row {
  position: relative;
  z-index: var(--layer-header);
  display: flex;
  justify-content: flex-end;
  margin-top: calc(var(--header-padding) * -0.65);
  margin-bottom: clamp(1rem, 3vw, 2rem);
}

.language-switcher a {
  display: inline-flex;
  min-height: var(--interactive-size);
  align-items: center;
  gap: 0.45rem;
  padding-block: 0.3rem;
  border-bottom: 1px solid transparent;
  color: var(--color-text-muted);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.language-switcher a + a::before {
  color: color-mix(in srgb, var(--color-text-muted), transparent 55%);
  content: "/";
  font-size: 0.7rem;
}

.language-switcher a:hover {
  color: var(--color-primary);
}

.language-switcher a[aria-current="page"] {
  border-color: currentColor;
  color: var(--color-text);
}

.book-main {
  position: relative;
  z-index: var(--layer-content);
  display: grid;
  flex: 1;
  gap: clamp(4rem, 9vw, 7rem);
  padding-block: clamp(1rem, 5vw, 4rem) 0;
}

.book-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(17rem, 0.72fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 7rem);
}

.book-copy {
  max-width: 38rem;
}

.book-copy h1 {
  margin: 0 0 1.5rem;
  font-size: clamp(3.75rem, 10vw, 7.5rem);
  font-weight: 900;
  letter-spacing: -0.075em;
  line-height: 0.82;
}

.book-copy p {
  max-width: 35rem;
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--text-body-size);
}

.book-copy .book-lead {
  margin-bottom: 1rem;
  color: var(--color-text);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.6;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: clamp(2rem, 5vw, 3rem);
}

.button {
  display: inline-flex;
  min-height: 2.9rem;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.15rem;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.button:hover {
  color: var(--color-surface);
  background: color-mix(in srgb, var(--color-primary), black 16%);
}

.button-primary {
  color: var(--color-surface);
  background: var(--color-primary);
}

.button-secondary {
  color: var(--color-primary);
  background: transparent;
}

.button-secondary:hover {
  color: var(--color-surface);
  background: var(--color-primary);
}

.book-cover {
  width: min(100%, 23rem);
  margin: 0;
  justify-self: end;
}

.book-cover-image {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border-primary);
  border-radius: 0.2rem;
}

.feedback-request {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-lg);
  padding: clamp(1.25rem, 3vw, 1.75rem) clamp(1.35rem, 4vw, 2.25rem);
  border: 1px solid color-mix(in srgb, var(--color-primary), transparent 76%);
  border-radius: calc(var(--radius-sm) * 3);
  background: color-mix(in srgb, var(--color-primary), var(--color-surface) 92%);
  box-shadow: 0 1rem 3rem color-mix(in srgb, var(--color-primary), transparent 92%);
  overflow: hidden;
}

.feedback-request::before {
  position: absolute;
  top: -4.5rem;
  right: 8%;
  width: 9rem;
  height: 9rem;
  border-radius: 50%;
  background: color-mix(in srgb, var(--color-primary), transparent 92%);
  content: "";
  pointer-events: none;
}

.feedback-request-copy {
  position: relative;
  display: grid;
  gap: 0.3rem;
  margin: 0;
}

.feedback-request-copy strong {
  color: var(--color-text);
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  line-height: 1.35;
}

.feedback-request-copy span {
  color: var(--color-text-muted);
  font-size: var(--text-body-size);
}

.feedback-request-link {
  position: relative;
  display: inline-flex;
  min-height: var(--interactive-size);
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--color-border-primary);
  color: var(--color-primary);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition:
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.feedback-request-link::after {
  content: "\2192";
}

.feedback-request-link:hover {
  border-color: currentColor;
  color: var(--color-primary-hover);
  transform: translateX(0.125rem);
}

.subscribe-section {
  display: grid;
  width: min(100%, 30rem);
  gap: 0.25rem;
  justify-items: center;
  margin-inline: auto;
  padding-block: clamp(2rem, 5vw, 3rem);
}

.subscribe-note {
  width: 100%;
  margin: 0;
  color: var(--color-text-muted);
  font-size: clamp(0.95rem, 1.6vw, 1.08rem);
  line-height: 1.65;
  text-align: center;
}

.subscribe-embed {
  width: 100%;
  max-width: 100%;
  border: 0;
  background: transparent;
}

@media (max-width: 820px) {
  .book-main {
    gap: 4rem;
    padding-top: 1.5rem;
  }

  .book-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 3.5rem;
  }

  .book-cover {
    width: min(82%, 20rem);
    justify-self: center;
  }

  .feedback-request {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-md);
  }

  .feedback-request-link {
    justify-self: start;
  }
}

@media (max-width: 520px) {
  .book-language-row {
    margin-top: 0;
  }

  .book-main {
    padding-top: 0.75rem;
  }

  .book-copy h1 {
    font-size: clamp(3rem, 18vw, 4.5rem);
  }

  .download-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .book-cover {
    width: min(88%, 18rem);
  }

  .subscribe-section {
    padding-block: 2rem;
  }
}