.manual-hero {
  position: relative;
  z-index: 1;
  padding-top: 88px;
  padding-bottom: 80px;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
}

.manual-hero::before {
  position: absolute;
  z-index: -1;
  top: 8%;
  right: 4%;
  width: 46%;
  height: 84%;
  background:
    repeating-linear-gradient(90deg, var(--color-curtain) 0 1px, transparent 1px 12px);
  content: "";
  mask-image: radial-gradient(ellipse at center, var(--color-mask), transparent 72%);
  opacity: .38;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at center, var(--color-mask), transparent 72%);
}

.manual-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, .92fr);
  align-items: center;
  gap: 72px;
}

.manual-hero-copy h1 {
  max-width: 10em;
  margin-top: 22px;
  margin-bottom: 24px;
  font-size: clamp(52px, 5.2vw, 68px);
}

.manual-hero-lede {
  max-width: 36em;
  margin-bottom: 24px;
  font-size: 18px;
}

.manual-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 22px;
}

.diagnostic-board {
  position: relative;
  padding: 28px;
  overflow: hidden;
}

.diagnostic-board::after {
  position: absolute;
  right: -54px;
  bottom: -54px;
  width: 150px;
  height: 150px;
  border: 1px solid var(--color-accent-edge);
  border-radius: 50%;
  box-shadow:
    0 0 0 24px var(--color-accent-shadow),
    0 0 0 48px var(--color-accent-shadow);
  content: "";
  pointer-events: none;
}

.diagnostic-board-head {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-accent);
  font-size: 12px;
  letter-spacing: .08em;
}

.diagnostic-flow {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0;
  margin: 22px 0;
  padding: 0;
  list-style: none;
  counter-reset: diagnostic-step;
}

.diagnostic-flow li {
  position: relative;
  min-height: 66px;
  padding: 8px 0 8px 52px;
  counter-increment: diagnostic-step;
}

.diagnostic-flow li::before {
  position: absolute;
  top: 7px;
  left: 0;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--color-accent-edge);
  border-radius: var(--radius-md);
  background: var(--color-accent-tint);
  color: var(--color-accent);
  content: counter(diagnostic-step);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
}

.diagnostic-flow li:not(:last-child)::after {
  position: absolute;
  top: 42px;
  bottom: -2px;
  left: 17px;
  border-left: 1px dashed var(--color-accent-edge);
  content: "";
}

.diagnostic-flow span,
.diagnostic-flow small {
  display: block;
}

.diagnostic-flow span {
  color: var(--color-text);
  font-weight: 800;
}

.diagnostic-flow small {
  color: var(--color-text-muted);
  font-size: 13px;
}

.diagnostic-board-note {
  position: relative;
  z-index: 1;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.manual-intro {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.manual-lead {
  margin-bottom: 0;
  color: var(--color-text);
  font-size: 18px;
  line-height: 1.85;
}

.manual-lead a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-edge);
  text-underline-offset: .2em;
}

.manual-intro .callout {
  margin-bottom: 0;
}

.manual-prose {
  padding-top: 64px;
  padding-bottom: 104px;
}

.manual-prose .toc-tabs {
  margin-bottom: 72px;
}

.manual-chapter {
  position: relative;
  max-width: var(--reading-width);
  margin-inline: auto;
  padding-bottom: 80px;
}

.manual-chapter + .manual-chapter {
  padding-top: 80px;
  border-top: 1px solid var(--color-border);
}

.chapter-heading {
  margin-bottom: 32px;
}

.chapter-mark {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
}

.chapter-heading h2 {
  margin-bottom: 0;
}

.manual-chapter h3 {
  position: relative;
  margin-top: 46px;
  padding-left: 18px;
  font-size: 24px;
}

.manual-chapter h3::before {
  position: absolute;
  top: .18em;
  bottom: .18em;
  left: 0;
  width: 4px;
  border-radius: var(--radius-pill);
  background: linear-gradient(var(--color-accent), var(--color-success));
  content: "";
}

.manual-chapter p,
.manual-chapter li {
  line-height: 1.9;
}

.manual-chapter p {
  margin-bottom: 1.35em;
}

.manual-chapter .table-scroll {
  margin-top: 30px;
  margin-bottom: 36px;
}

.manual-chapter .callout {
  margin-top: 34px;
  margin-bottom: 34px;
}

.manual-chapter pre {
  margin-top: 28px;
  margin-bottom: 30px;
}

.ticket-template {
  margin-top: 34px;
  margin-bottom: 36px;
  padding: 24px;
}

.ticket-template-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.ticket-template-head span {
  color: var(--color-accent);
  font-size: 11px;
  letter-spacing: .1em;
}

.ticket-template pre {
  margin: 0;
  background: var(--color-bg);
}

@media (max-width: 980px) {
  .manual-hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .manual-hero-copy {
    max-width: var(--reading-width);
  }

  .diagnostic-board {
    max-width: var(--reading-width);
  }
}

@media (max-width: 768px) {
  .manual-hero {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .manual-hero::before {
    top: auto;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 46%;
  }

  .manual-hero-grid {
    gap: 36px;
  }

  .manual-hero-copy h1 {
    font-size: clamp(32px, 9.8vw, 40px);
  }

  .manual-hero-lede,
  .manual-lead {
    font-size: 16px;
  }

  .manual-prose {
    padding-top: 48px;
    padding-bottom: 80px;
  }

  .manual-prose .toc-tabs {
    margin-bottom: 54px;
  }

  .manual-chapter {
    padding-bottom: 64px;
  }

  .manual-chapter + .manual-chapter {
    padding-top: 64px;
  }

  .manual-chapter h3 {
    margin-top: 38px;
    font-size: 21px;
  }
}

@media (max-width: 640px) {
  .manual-hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .manual-hero-actions .btn-primary,
  .manual-hero-actions .arrow-link {
    width: 100%;
    justify-content: center;
  }

  .diagnostic-board {
    padding: 22px;
  }

  .diagnostic-board-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .diagnostic-board::after {
    display: none;
  }

  .manual-chapter h3 {
    padding-left: 14px;
  }

  .ticket-template {
    padding: 18px;
  }

  .ticket-template-head {
    align-items: flex-start;
    flex-direction: column;
  }
}