.manual-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 82% 32%, var(--color-accent-glow), transparent 28%),
    var(--color-page);
}

.manual-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: var(--color-border-strong);
  opacity: 0.45;
}

.manual-hero-layout {
  min-height: 690px;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(430px, 0.78fr);
  align-items: center;
  gap: clamp(40px, 7vw, 100px);
  padding-top: clamp(72px, 9vw, 120px);
  padding-bottom: clamp(72px, 9vw, 120px);
}

.manual-hero-copy {
  position: relative;
  z-index: 2;
}

.manual-hero-copy h1 {
  max-width: 11ch;
}

.manual-intro {
  max-width: 720px;
  margin-bottom: 28px;
  color: var(--color-muted);
}

.manual-intro a,
.manual-article a {
  color: var(--color-accent-dark);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 0.2em;
}

.manual-intro a:hover,
.manual-article a:hover {
  color: var(--color-ink);
}

.diagnostic-board {
  position: relative;
  min-width: 0;
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--color-rack-edge);
  border-radius: var(--radius-lg);
  background: var(--color-rack);
  box-shadow: var(--shadow-panel);
  color: var(--color-rack-copy);
  transform: rotate(0.45deg);
}

.diagnostic-board::before,
.diagnostic-board::after {
  content: "";
  position: absolute;
  width: 9px;
  height: 9px;
  border: 1px solid var(--color-rack-line);
  border-radius: var(--radius-pill);
  background: var(--color-rack-raised);
}

.diagnostic-board::before {
  top: 10px;
  left: 10px;
}

.diagnostic-board::after {
  right: 10px;
  bottom: 10px;
}

.diagnostic-board-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-rack-line);
  color: var(--color-rack-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.07em;
}

.diagnostic-path {
  position: relative;
  display: grid;
  gap: 0;
  margin: 0;
  padding: 18px 0;
  list-style: none;
}

.diagnostic-path::before {
  content: "";
  position: absolute;
  top: 42px;
  bottom: 42px;
  left: 15px;
  width: 1px;
  background: var(--color-rack-line);
}

.diagnostic-path li {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 32px 1fr;
  align-items: center;
  gap: 16px;
  min-height: 82px;
  padding: 12px;
  border-bottom: 1px solid var(--color-rack-line);
}

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

.diagnostic-port {
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-rack-line);
  border-radius: var(--radius-xs);
  background: var(--color-rack-raised);
  box-shadow: inset 0 0 0 7px var(--color-rack-soft);
}

.diagnostic-port::after {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-rack-muted);
}

.diagnostic-port.is-active {
  border-color: var(--color-accent);
  box-shadow: inset 0 0 0 7px var(--color-rack-soft), 0 0 18px var(--color-accent-glow);
}

.diagnostic-port.is-active::after {
  background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-glow);
}

.diagnostic-path strong {
  display: block;
  color: var(--color-rack-copy);
  font-size: 16px;
}

.diagnostic-path small {
  display: block;
  margin-top: 3px;
  color: var(--color-rack-muted);
  font-size: 12px;
}

.diagnostic-note {
  margin: 0;
  padding: 14px;
  border: 1px solid var(--color-rack-line);
  border-radius: var(--radius-sm);
  background: var(--color-rack-raised);
  color: var(--color-rack-muted);
  font-size: 12px;
}

.manual-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(190px, 250px) minmax(0, var(--reading-width));
  justify-content: center;
  align-items: start;
  gap: clamp(34px, 6vw, 84px);
  padding-top: clamp(56px, 8vw, 96px);
  padding-bottom: var(--section-space);
}

.manual-toc {
  top: var(--toc-offset);
  display: grid;
  width: 100%;
  padding: 8px;
  overflow: visible;
}

.manual-toc a {
  width: 100%;
  white-space: normal;
}

.manual-article {
  min-width: 0;
}

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

.manual-chapter:first-child {
  padding-top: 0;
}

.manual-chapter:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.chapter-heading {
  position: relative;
  margin-bottom: 32px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--color-border);
}

.chapter-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 84px;
  height: 3px;
  background: var(--color-accent);
}

.chapter-code {
  display: block;
  margin-bottom: 12px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.manual-article h2 {
  max-width: 18ch;
  margin-bottom: 0;
}

.manual-article h3 {
  margin-top: 42px;
  font-size: clamp(21px, 2.3vw, 27px);
}

.manual-article p,
.manual-article li {
  color: var(--color-muted);
}

.manual-article p {
  line-height: 1.9;
}

.manual-article strong {
  color: var(--color-ink);
}

.manual-article pre {
  margin-block: 24px;
}

.diagnostic-flow {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-block: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.diagnostic-flow div {
  min-width: 0;
  padding: 20px;
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.diagnostic-flow div:nth-child(even) {
  border-right: 0;
}

.diagnostic-flow div:nth-last-child(-n + 2) {
  border-bottom: 0;
}

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

.diagnostic-flow strong {
  margin-bottom: 5px;
}

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

.symptom-matrix {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-block: 28px;
}

.symptom-matrix article {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.symptom-matrix article:nth-child(3n + 1) {
  background: var(--color-surface-soft);
}

.symptom-matrix strong {
  display: block;
  margin-bottom: 8px;
}

.symptom-matrix p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.platform-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-block: 28px;
}

.platform-notes article {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
}

.platform-notes article:first-child {
  border-top: 3px solid var(--color-ink);
}

.platform-notes article:last-child {
  border-top: 3px solid var(--color-accent);
}

.platform-notes .mono {
  color: var(--color-accent-dark);
  font-size: 10px;
  letter-spacing: 0.06em;
}

.platform-notes h3 {
  margin-top: 14px;
  font-size: 20px;
}

.platform-notes p {
  margin-bottom: 0;
  font-size: 14px;
}

.ticket-checklist {
  margin-block: 30px;
  padding: clamp(22px, 4vw, 32px);
  border: 1px solid var(--color-rack-edge);
  border-radius: var(--radius-md);
  background: var(--color-rack);
  color: var(--color-rack-copy);
  box-shadow: 0 20px 44px var(--color-soft-shadow);
}

.ticket-checklist h3 {
  margin-top: 0;
  color: var(--color-rack-copy);
}

.ticket-checklist ul {
  display: grid;
  gap: 12px;
  margin-bottom: 0;
}

.ticket-checklist li {
  color: var(--color-rack-muted);
}

.ticket-checklist strong {
  color: var(--color-rack-copy);
}

.manual-article .table-scroll {
  margin-block: 30px;
}

.manual-article .callout {
  line-height: 1.8;
}

@media (max-width: 1080px) {
  .manual-hero-layout {
    grid-template-columns: minmax(0, 1fr) minmax(380px, 0.8fr);
    gap: 36px;
  }

  .manual-shell {
    grid-template-columns: minmax(170px, 220px) minmax(0, var(--reading-width));
    gap: 32px;
  }
}

@media (max-width: 860px) {
  .manual-hero-layout {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .diagnostic-board {
    width: 100%;
    max-width: 680px;
    transform: none;
  }

  .manual-shell {
    display: block;
  }

  .manual-toc {
    top: 10px;
    display: flex;
    width: 100%;
    margin-bottom: 64px;
    overflow-x: auto;
  }

  .manual-toc a {
    width: auto;
    white-space: nowrap;
  }

  .manual-article {
    max-width: var(--reading-width);
    margin-inline: auto;
  }
}

@media (max-width: 640px) {
  .manual-hero-layout {
    padding-top: 52px;
    padding-bottom: 56px;
  }

  .manual-hero-copy h1 {
    max-width: 100%;
  }

  .diagnostic-board {
    padding: 16px;
  }

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

  .manual-shell {
    padding-top: 42px;
    padding-bottom: 76px;
  }

  .manual-toc {
    margin-bottom: 48px;
  }

  .diagnostic-flow,
  .symptom-matrix,
  .platform-notes {
    grid-template-columns: 1fr;
  }

  .diagnostic-flow div {
    border-right: 0;
  }

  .diagnostic-flow div:nth-last-child(2) {
    border-bottom: 1px solid var(--color-border);
  }

  .manual-article h3 {
    margin-top: 34px;
  }

  .ticket-checklist {
    padding: 20px;
  }
}