.book-hub {
  --hub-accent: #0479a8;
  --hub-accent-strong: #0f766e;
  --hub-accent-soft: rgba(4, 121, 168, 0.1);
  --hub-cover-bg: #f4f7fb;
}

.book-hub--reasoning {
  --hub-accent: #c5050c;
  --hub-accent-strong: #8f1d1d;
  --hub-accent-soft: rgba(197, 5, 12, 0.09);
  --hub-cover-bg: #fbf5f5;
}

.book-hub__hero {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(240px, 0.88fr);
  gap: 28px;
  align-items: stretch;
  margin: 0 0 34px;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background:
    linear-gradient(135deg, var(--hub-accent-soft), transparent 46%),
    var(--color-elevated);
}

.book-hub__eyebrow {
  margin: 0 0 10px;
  color: var(--hub-accent-strong);
  font-size: 0.82em;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.book-hub__lede {
  max-width: 40rem;
  margin: 0;
  color: var(--color-text);
  font-size: 1em;
  line-height: 1.55;
}

.book-hub__actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(145px, 1fr));
  gap: 8px;
  max-width: 440px;
  margin-top: 18px;
}

.book-hub__button,
.book-hub__button:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0.46rem 0.7rem;
  border: 1px solid var(--color-border-strong);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-heading);
  font-size: 0.9em;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
}

.book-hub__button--primary,
.book-hub__button--primary:visited {
  border-color: var(--hub-accent);
  background: var(--hub-accent);
  color: #ffffff;
}

.book-hub__button:hover,
.book-hub__button:focus {
  border-color: var(--hub-accent-strong);
  color: var(--color-heading);
  text-decoration: none;
}

.book-hub__button--primary:hover,
.book-hub__button--primary:focus {
  background: var(--hub-accent-strong);
  color: #ffffff;
}

.book-hub__secondary-actions {
  margin: 10px 0 0;
  color: var(--color-text-muted);
  font-size: 0.88em;
  line-height: 1.45;
}

.book-hub__secondary-actions a {
  font-weight: 700;
}

.book-hub__cover-panel {
  display: grid;
  gap: 14px;
  align-content: start;
  justify-items: center;
  min-width: 0;
  padding: 4px 0 0;
}

.book-hub__cover {
  display: block;
  width: 150px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--shadow-soft);
}

.book-hub__cover-link {
  display: block;
  border-radius: 4px;
}

.book-hub__cover-link:hover,
.book-hub__cover-link:focus {
  outline: 2px solid var(--hub-accent);
  outline-offset: 4px;
}

.book-hub__cover-meta {
  display: grid;
  gap: 12px;
  justify-self: center;
  width: fit-content;
  max-width: 100%;
  min-width: 0;
}

.book-hub__meta-item {
  margin: 0;
  padding: 0;
}

.book-hub__meta-label {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.74em;
  font-weight: 700;
  line-height: 1.25;
}

.book-hub__meta-value {
  display: block;
  margin-top: 2px;
  color: var(--color-heading);
  font-size: 0.94em;
  font-weight: 650;
  line-height: 1.35;
}

.book-hub__amazon-rating,
.book-hub__amazon-rating:visited {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  gap: 3px;
  color: #111827;
  font-size: 1em;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
}

.book-hub__amazon-rating:hover,
.book-hub__amazon-rating:focus {
  color: #111827;
  text-decoration: none;
}

.book-hub__amazon-rating-value {
  color: #111827;
  font-weight: 500;
}

.book-hub__amazon-stars {
  display: inline-flex;
  align-items: center;
  gap: 0;
  color: #ff9900;
}

.book-hub__amazon-star,
.book-hub__amazon-chevron {
  flex: 0 0 auto;
  fill: currentColor;
}

.book-hub__amazon-star {
  width: 16px;
  height: 16px;
  color: #ff9900;
}

.book-hub__amazon-star:not(.book-hub__amazon-star--half) path {
  fill: currentColor;
  stroke: currentColor;
  stroke-width: 0.6;
  stroke-linejoin: round;
}

.book-hub__amazon-star-outline {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linejoin: round;
}

.book-hub__amazon-chevron {
  width: 14px;
  height: 14px;
  margin-left: 1px;
  color: #111827;
}

.book-hub__amazon-review-count {
  margin-left: 3px;
  color: #146eb4;
  font-weight: 600;
}

.book-hub__amazon-rating:hover .book-hub__amazon-review-count,
.book-hub__amazon-rating:focus .book-hub__amazon-review-count,
.book-hub__amazon-rating--empty:hover,
.book-hub__amazon-rating--empty:focus {
  text-decoration: underline;
}

.book-hub__amazon-rating--empty,
.book-hub__amazon-rating--empty:visited {
  color: #146eb4;
  font-weight: 600;
}

.book-hub__github-star,
.book-hub__github-star:visited {
  display: inline-flex;
  align-items: stretch;
  max-width: 100%;
  min-height: 31px;
  overflow: hidden;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  background: #f6f8fa;
  color: #24292f;
  font-size: 0.9em;
  font-weight: 650;
  line-height: 1;
  text-decoration: none;
}

.book-hub__github-star:hover,
.book-hub__github-star:focus {
  background: #f3f4f6;
  color: #24292f;
  text-decoration: none;
}

.book-hub__github-star-main {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  padding: 5px 10px;
  border-right: 1px solid #d0d7de;
}

.book-hub__github-star-icon,
.book-hub__github-star-menu svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  fill: currentColor;
}

.book-hub__github-star-icon,
.book-hub__github-star-menu {
  color: #57606a;
}

.book-hub__github-star-count {
  display: inline-flex;
  align-items: center;
  padding: 3px 7px;
  border-radius: 999px;
  background: #eaeef2;
  color: #24292f;
  font-weight: 700;
}

.book-hub__github-star-menu {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
}

.book-hub__visual {
  margin: 0 0 34px;
}

.book-hub__visual img {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: contain;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--hub-cover-bg);
}

.book-hub__visual figcaption {
  margin-top: 8px;
  color: var(--color-text-muted);
  font-size: 0.88em;
  line-height: 1.45;
}

.book-hub__section {
  margin: 0 0 36px;
}

.book-hub__section + .book-hub__section {
  padding-top: 14px;
}

.book-hub__section > h2,
.book-hub__section > h3 {
  margin-top: 0;
}

.book-hub__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: 18px 16px;
}

.book-hub__grid--two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.book-hub-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
}

.book-hub-card__kicker {
  color: var(--hub-accent-strong);
  font-size: 0.78em;
  font-weight: 700;
  line-height: 1.3;
  text-transform: uppercase;
}

.book-hub__study-guide .book-hub-card__kicker {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 5px 9px 3px;
  border: 1px solid var(--hub-accent);
  border-radius: 999px;
  background: var(--hub-accent-soft);
  color: var(--hub-accent-strong);
  font-size: 0.86em;
  font-weight: 850;
  letter-spacing: 0;
}

.book-hub-card h3,
.book-hub-card h4 {
  margin: 0;
  font-size: 1.03em;
  line-height: 1.3;
}

.book-hub-card p {
  margin: 0;
  color: var(--color-text);
  font-size: 0.94em;
  line-height: 1.55;
}

.book-hub-card a {
  margin-top: auto;
  font-weight: 700;
}

.book-hub-testimonial blockquote {
  margin: 0;
  padding: 0;
  border: 0;
}

.book-hub-testimonial p {
  color: var(--color-heading);
  font-size: 1.02em;
  font-weight: 700;
  line-height: 1.45;
}

.book-hub-testimonial footer {
  margin-top: 8px;
  color: var(--color-text-muted);
  font-size: 0.86em;
  line-height: 1.45;
}

.book-hub-path {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.book-hub-path li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

.book-hub-path li:last-child {
  border-bottom: 0;
}

.book-hub-path__step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--hub-accent-soft);
  color: var(--hub-accent-strong);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.book-hub-path h3,
.book-hub-path h4 {
  margin: 0 0 5px;
  font-size: 1.02em;
}

.book-hub-path p {
  margin: 0;
  line-height: 1.55;
}

.book-hub-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  font-size: 0.94em;
}

.book-hub-table th,
.book-hub-table td {
  padding: 0.75rem 0.8rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.book-hub-table th {
  background: var(--color-elevated);
  color: var(--color-heading);
  font-size: 0.84em;
  text-align: left;
}

.book-hub-table tr:last-child th,
.book-hub-table tr:last-child td {
  border-bottom: 0;
}

.book-hub-table td:first-child {
  width: 8.5rem;
  color: var(--color-heading);
  font-weight: 700;
}

.book-hub-table a {
  font-weight: 700;
}

.book-hub__note {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-left: 4px solid var(--hub-accent);
  background: var(--hub-accent-soft);
  color: var(--color-text);
  line-height: 1.55;
}

@media (max-width: 860px) {
  .book-hub__hero {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .book-hub__grid,
  .book-hub__grid--two {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .book-hub__actions {
    grid-template-columns: 1fr;
  }

  .book-hub__cover {
    width: 138px;
  }

  .book-hub-path li {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }

  .book-hub-path__step {
    width: 34px;
    height: 34px;
  }

  .book-hub-table,
  .book-hub-table tbody,
  .book-hub-table tr,
  .book-hub-table th,
  .book-hub-table td {
    display: block;
  }

  .book-hub-table thead {
    display: none;
  }

  .book-hub-table tr {
    border-bottom: 1px solid var(--color-border);
  }

  .book-hub-table tr:last-child {
    border-bottom: 0;
  }

  .book-hub-table td {
    border-bottom: 0;
  }

  .book-hub-table td:first-child {
    width: auto;
    padding-bottom: 0;
  }
}