.deepdoc-hero {
  position: relative;
  min-height: calc(100svh - var(--header-height));
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  background-image:
    repeating-linear-gradient(to right, var(--color-cream-grid) 0 1px, transparent 1px 104px),
    repeating-linear-gradient(to bottom, var(--color-cream-grid-soft) 0 1px, transparent 1px 88px),
    radial-gradient(circle, var(--color-cream-dot) 1px, transparent 1.6px);
  background-size: auto, auto, 52px 88px;
}

.deepdoc-hero::after {
  position: absolute;
  right: -15%;
  bottom: -60%;
  width: 68%;
  aspect-ratio: 1;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  content: "";
  pointer-events: none;
}

.deepdoc-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(440px, 1.1fr);
  gap: 64px;
  align-items: center;
  padding-top: 72px;
  padding-bottom: 72px;
}

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

.deepdoc-hero-copy .badge {
  margin-bottom: 18px;
}

.deepdoc-hero-copy h1 {
  max-width: 10em;
}

.deepdoc-intro {
  max-width: 36em;
  margin-bottom: 28px;
  color: var(--color-muted);
  font-size: clamp(17px, 1.8vw, 21px);
  line-height: 1.75;
}

.deepdoc-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 24px;
}

.deepdoc-chart {
  position: relative;
  min-height: 500px;
  padding: 54px 28px 24px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.deepdoc-chart::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-cream-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-cream-grid) 1px, transparent 1px);
  background-size: 48px 48px;
  content: "";
  pointer-events: none;
}

.deepdoc-coordinate {
  position: absolute;
  top: 20px;
  left: 28px;
  color: var(--color-accent);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.deepdoc-chart svg {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
}

.deepdoc-grid-line {
  fill: none;
  stroke: var(--color-cream);
  stroke-opacity: 0.08;
  stroke-width: 1;
}

.deepdoc-route-muted {
  fill: none;
  stroke: var(--color-cream);
  stroke-dasharray: 5 8;
  stroke-linecap: round;
  stroke-opacity: 0.3;
  stroke-width: 1.5;
}

.deepdoc-route-main {
  fill: none;
  stroke: var(--color-cream);
  stroke-linecap: round;
  stroke-opacity: 0.88;
  stroke-width: 2;
}

.deepdoc-node-ring {
  fill: var(--color-panel);
  stroke: var(--color-cream);
  stroke-opacity: 0.65;
  stroke-width: 1;
}

.deepdoc-node {
  fill: var(--color-accent);
}

.deepdoc-marker {
  fill: var(--color-accent);
  filter: drop-shadow(0 0 9px var(--color-accent));
}

.deepdoc-chart-legend {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.deepdoc-chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.deepdoc-chart-legend span::before {
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-accent);
  content: "";
}

.deepdoc-preface {
  display: grid;
  grid-template-columns: minmax(260px, 0.7fr) minmax(0, 1.3fr);
  gap: 54px;
  align-items: start;
  margin-bottom: 38px;
}

.deepdoc-preface h2 {
  margin-bottom: 0;
  font-size: clamp(30px, 3.5vw, 46px);
}

.deepdoc-preface-copy {
  color: var(--color-muted);
  font-size: 16px;
}

.deepdoc-preface-copy a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-deep);
  text-underline-offset: 3px;
}

.deepdoc-toc {
  --toc-offset: 74px;
}

.deepdoc-article > .section {
  border-top: 1px solid var(--color-border);
}

.deepdoc-article > .section:first-child {
  border-top: 0;
}

.deepdoc-article .reading-wrap {
  position: relative;
}

.deepdoc-article .prose > h2 {
  margin-top: 0;
  margin-bottom: 42px;
}

.deepdoc-article .prose > h3 {
  position: relative;
  margin-top: 44px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  font-size: clamp(20px, 2vw, 25px);
}

.deepdoc-article .prose > h3::before {
  position: absolute;
  top: -1px;
  left: 0;
  width: 76px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.deepdoc-article .prose p {
  line-height: 1.86;
}

.deepdoc-article .prose > p + p {
  margin-top: -0.2em;
}

.deepdoc-table {
  margin-block: 34px;
}

.deepdoc-ticket {
  margin-block: 34px;
}

.deepdoc-ticket h3 {
  font-size: 21px;
}

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

.deepdoc-checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-block: 38px;
}

.deepdoc-checklist .card {
  box-shadow: none;
}

.deepdoc-checklist h3 {
  margin-top: 16px;
  font-size: 19px;
}

.deepdoc-checklist p {
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: 14px;
}

.deepdoc-article .promo-block {
  max-width: none;
}

@media (max-width: 980px) {
  .deepdoc-hero {
    min-height: auto;
  }

  .deepdoc-hero-grid {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .deepdoc-chart {
    min-height: 0;
  }

  .deepdoc-preface {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .deepdoc-hero::after,
  .deepdoc-coordinate,
  .deepdoc-chart-legend {
    display: none;
  }

  .deepdoc-hero-grid {
    gap: 34px;
    padding-top: 54px;
    padding-bottom: 54px;
  }

  .deepdoc-chart {
    min-height: 0;
    padding: 16px;
  }

  .deepdoc-toc {
    --toc-offset: 72px;
  }

  .deepdoc-article .prose > h2 {
    margin-bottom: 32px;
  }

  .deepdoc-checklist {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .deepdoc-hero-grid {
    padding-top: 42px;
    padding-bottom: 42px;
  }

  .deepdoc-chart {
    padding: 10px;
  }

  .deepdoc-facts .chip {
    width: 100%;
    justify-content: center;
  }

  .deepdoc-article .prose > h3 {
    margin-top: 36px;
  }

  .deepdoc-ticket {
    padding: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .deepdoc-marker {
    filter: none;
  }
}