.page-shell {
  position: relative;
  z-index: 1;
  width: min(calc(100% - 32px), var(--max));
  margin: 18px auto 32px;
}

.top-bar-wrap {
  position: sticky;
  top: 14px;
  z-index: 50;
  margin-bottom: 18px;
}

.top-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  min-height: 72px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(18, 20, 22, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.top-bar__left,
.top-bar__center,
.top-bar__right {
  display: flex;
  align-items: center;
  min-width: 0;
}

.top-bar__center {
  justify-content: center;
  text-align: center;
  padding: 0 8px;
}

.top-bar__right {
  justify-content: flex-end;
}

.top-bar-meta {
  min-width: 0;
}

.top-bar-eyebrow {
  font-size: 0.68rem;
  line-height: 1.1;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--soft);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.top-bar-title {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-meta {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: center;
  margin-bottom: 18px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
  box-shadow: var(--shadow);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--soft);
}

.breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--text);
}

.progress-wrap {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: min(100%, 280px);
}

.progress-label {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
  white-space: nowrap;
}

.progress-track {
  position: relative;
  width: 180px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.progress-bar {
  position: absolute;
  inset: 0 auto 0 0;
  width: 8%;
  border-radius: inherit;
  background: linear-gradient(
    90deg,
    var(--phase-1),
    var(--phase-3),
    var(--phase-4),
    var(--phase-5)
  );
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.9fr);
  gap: 24px;
  align-items: stretch;
}

.main-grid {
  display: grid;
  gap: 18px;
}

.section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  align-items: start;
  margin-bottom: 18px;
}

.index-grid,
.entry-grid,
.site-grid {
  display: grid;
  gap: 14px;
}

.index-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.site-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr auto;
  gap: 16px;
  align-items: center;
}

@media (max-width: 1120px) {
  .hero-grid,
  .footer-grid,
  .index-grid,
  .site-grid {
    grid-template-columns: 1fr;
  }

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

  .top-bar {
    grid-template-columns: 1fr;
    border-radius: 28px;
  }

  .top-bar__left,
  .top-bar__center,
  .top-bar__right {
    justify-content: center;
  }

  .book-meta {
    grid-template-columns: 1fr;
  }

  .progress-wrap {
    min-width: 0;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 18px), var(--max));
    margin-top: 10px;
  }

  .section-head {
    grid-template-columns: 1fr;
  }

  .progress-track {
    width: 100%;
  }
}