:root {
  --deepdoc-hero-min: 620px;
  --deepdoc-copy-max: 690px;
  --deepdoc-diagram-max: 570px;
  --deepdoc-article-max: 850px;
  --deepdoc-chapter-gap: clamp(78px, 10vw, 136px);
  --deepdoc-copy-gap: 1.15em;
  --deepdoc-card-gap: 16px;
  --deepdoc-table-min: 760px;
  --deepdoc-diagram-line: 3px;
  --deepdoc-diagram-line-soft: 2px;
  --deepdoc-diagram-node: 4px;
  --deepdoc-hero-glow: var(--color-hill-far);
  --deepdoc-card-tint: var(--color-panel);
  --deepdoc-code-bg: var(--color-panel-alt);
}

.manual-hero {
  position: relative;
  min-height: var(--deepdoc-hero-min);
  overflow: clip;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at right center, var(--deepdoc-hero-glow), transparent),
    var(--color-bg);
  padding-top: clamp(62px, 8vw, 108px);
  padding-bottom: clamp(70px, 9vw, 118px);
}

.manual-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(380px, 0.95fr);
  align-items: center;
  gap: clamp(36px, 6vw, 88px);
}

.manual-hero-copy {
  position: relative;
  z-index: 2;
  max-width: var(--deepdoc-copy-max);
}

.manual-hero-copy h1 {
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.25em;
  margin-top: 22px;
}

.manual-hero-copy .lead {
  margin-top: 24px;
}

.manual-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.manual-hero-note {
  margin-top: 24px;
  color: var(--color-muted);
  font-size: 14px;
}

.manual-diagram {
  width: 100%;
  max-width: var(--deepdoc-diagram-max);
  justify-self: end;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  padding: clamp(16px, 3vw, 28px);
  box-shadow: var(--shadow-device);
}

.manual-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

.manual-diagram-route,
.manual-diagram-link {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: var(--deepdoc-diagram-line);
  stroke-linecap: round;
}

.manual-diagram-route--back {
  stroke: var(--color-tint-lavender);
  stroke-width: var(--deepdoc-diagram-line-soft);
  stroke-dasharray: 8 9;
}

.manual-diagram-route--teal {
  stroke: var(--color-success);
  stroke-width: var(--deepdoc-diagram-line-soft);
}

.manual-diagram-link {
  stroke: var(--color-border);
  stroke-width: var(--deepdoc-diagram-line-soft);
  stroke-dasharray: 6 8;
}

.manual-diagram-card {
  fill: var(--color-panel);
  stroke: var(--color-border);
}

.manual-diagram-tab--lavender {
  fill: var(--color-tint-lavender);
}

.manual-diagram-tab--teal {
  fill: var(--color-tint-teal);
}

.manual-diagram-tab--orange {
  fill: var(--color-tint-orange);
}

.manual-diagram-tab--cream {
  fill: var(--color-tint-cream);
}

.manual-diagram-title {
  fill: var(--color-text);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 760;
}

.manual-diagram-label {
  fill: var(--color-muted);
  font-family: var(--font-body);
  font-size: 9px;
}

.manual-diagram-node {
  fill: var(--color-accent);
  stroke: var(--color-panel);
  stroke-width: var(--deepdoc-diagram-node);
}

.manual-diagram-node--small {
  fill: var(--color-success);
}

.manual-article {
  width: 100%;
  max-width: calc(var(--deepdoc-article-max) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-bottom: var(--section-space);
}

.manual-intro {
  border-bottom: 1px solid var(--color-border);
  padding-top: clamp(30px, 5vw, 62px);
  padding-bottom: clamp(56px, 7vw, 88px);
}

.manual-intro > p {
  color: var(--color-muted);
  font-size: 18px;
}

.manual-intro .callout {
  margin-top: 28px;
}

.manual-article a:not(.btn) {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-tint-lavender);
  text-underline-offset: 0.18em;
}

.manual-chapter {
  padding-top: var(--deepdoc-chapter-gap);
}

.manual-chapter > .eyebrow {
  margin-bottom: 20px;
}

.manual-chapter > h2 {
  margin-bottom: 34px;
}

.manual-chapter h3 {
  margin-top: 42px;
  margin-bottom: 14px;
  font-size: clamp(22px, 2.5vw, 28px);
}

.manual-chapter p + p {
  margin-top: var(--deepdoc-copy-gap);
}

.manual-chapter p {
  color: var(--color-muted);
}

.manual-chapter .table-scroll,
.manual-chapter .callout,
.manual-chapter pre {
  margin-top: 34px;
  margin-bottom: 34px;
}

.manual-chapter .compare-table {
  min-width: var(--deepdoc-table-min);
}

.manual-chapter pre {
  background: var(--deepdoc-code-bg);
}

.manual-diagnostic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--deepdoc-card-gap);
  margin-top: 34px;
  margin-bottom: 34px;
}

.manual-diagnostic-card {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--deepdoc-card-tint);
  padding: 24px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.manual-diagnostic-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-tint-lavender);
}

.manual-diagnostic-card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 20px;
}

.manual-diagnostic-card p {
  font-size: 15px;
}

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

  .manual-hero-copy {
    max-width: none;
  }

  .manual-diagram {
    max-width: var(--deepdoc-diagram-max);
    justify-self: center;
  }
}

@media (max-width: 768px) {
  .manual-hero {
    min-height: auto;
  }

  .manual-hero-grid {
    gap: 48px;
  }

  .manual-hero-copy h1 {
    gap: 0 0.2em;
  }

  .manual-diagram {
    width: min(100%, var(--deepdoc-diagram-max));
    padding: 12px;
  }

  .manual-diagnostic-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .manual-hero-actions {
    width: 100%;
  }

  .manual-hero-actions .btn {
    flex: 1 1 140px;
  }

  .manual-hero-note {
    font-size: 13px;
  }

  .manual-diagram {
    border-radius: var(--radius-lg);
  }

  .manual-intro > p {
    font-size: 16px;
  }

  .manual-diagnostic-card {
    padding: 20px;
  }
}