.deepdoc-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  padding-top: 86px;
  padding-bottom: 72px;
}

.deepdoc-hero::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid) 1px, var(--color-transparent) 1px);
  background-size: 54px 54px;
  content: "";
  opacity: 0.38;
  pointer-events: none;
}

.deepdoc-hero::after {
  position: absolute;
  top: 12%;
  right: -12%;
  width: min(720px, 72vw);
  height: 420px;
  border-radius: var(--radius-pill);
  background: radial-gradient(ellipse, var(--color-accent-mist), var(--color-transparent) 72%);
  content: "";
  pointer-events: none;
}

.deepdoc-hero .wrap {
  position: relative;
  z-index: 1;
}

.deepdoc-hero-copy {
  max-width: 900px;
}

.deepdoc-hero h1 {
  max-width: 850px;
}

.deepdoc-lead {
  max-width: 780px;
  margin-bottom: 26px;
  font-size: 18px;
}

.deepdoc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.deepdoc-route {
  position: absolute;
  right: var(--gutter);
  bottom: 34px;
  width: min(340px, 31vw);
  height: 120px;
  opacity: 0.72;
}

.deepdoc-route-line {
  fill: none;
  stroke: var(--color-line-soft);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.2;
}

.deepdoc-route-water {
  fill: none;
  stroke: var(--color-accent);
  stroke-linecap: round;
  stroke-width: 2;
}

.deepdoc-route-node {
  fill: var(--color-panel-raised);
  stroke: var(--color-line-strong);
  stroke-width: 1.2;
}

.deepdoc-route-node.is-active {
  fill: var(--color-accent);
  stroke: var(--color-accent);
}

.deepdoc-shell {
  position: relative;
}

.deepdoc-shell .toc-tabs {
  margin-bottom: 54px;
}

.deepdoc-content {
  width: 100%;
  max-width: var(--reading-width);
  margin-inline: auto;
}

.deepdoc-section {
  padding-top: 14px;
  padding-bottom: 74px;
  border-bottom: 1px solid var(--color-border);
}

.deepdoc-section + .deepdoc-section {
  padding-top: 74px;
}

.deepdoc-section:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.deepdoc-section h2 {
  max-width: 720px;
}

.deepdoc-section h3 {
  margin-top: 38px;
}

.deepdoc-section p {
  margin-bottom: 20px;
}

.deepdoc-section ul,
.deepdoc-section ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.deepdoc-section li + li {
  margin-top: 10px;
}

.deepdoc-section .callout {
  margin-top: 30px;
  margin-bottom: 30px;
}

.deepdoc-section .table-scroll {
  margin-top: 28px;
  margin-bottom: 30px;
}

.deepdoc-section .data-table {
  min-width: 760px;
}

.deepdoc-section .data-table td {
  color: var(--color-text-muted);
}

.deepdoc-section .data-table td:first-child {
  color: var(--color-text);
}

.doc-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 14px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.doc-kicker::before {
  width: 24px;
  height: 1px;
  background: var(--color-accent);
  content: "";
}

.decision-chain {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  margin-bottom: 30px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: clip;
  background: var(--color-border);
}

.decision-step {
  display: grid;
  grid-template-columns: minmax(120px, 0.34fr) minmax(0, 1fr);
  gap: 22px;
  background: var(--color-panel);
  padding: 20px 22px;
}

.decision-step strong {
  font-family: var(--font-mono);
  font-size: 13px;
}

.decision-step p {
  margin-bottom: 0;
}

.term-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
  margin-bottom: 30px;
}

.term-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  padding: 22px;
  box-shadow: inset 0 1px 0 var(--color-edge-highlight);
}

.term-card h3 {
  margin-top: 0;
  font-size: 20px;
}

.term-card p:last-child {
  margin-bottom: 0;
}

.doc-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.doc-links a:not(.btn) {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  padding: 9px 15px;
  color: var(--color-text);
  font-size: 14px;
  text-decoration: none;
}

.doc-links a:not(.btn):hover {
  border-color: var(--color-line-soft);
  color: var(--color-accent);
}

.deepdoc-promo {
  margin-top: 78px;
}

@media (max-width: 768px) {
  .deepdoc-hero {
    padding-top: 64px;
    padding-bottom: 58px;
  }

  .deepdoc-lead {
    font-size: 16px;
  }

  .deepdoc-route {
    display: none;
  }

  .deepdoc-shell .toc-tabs {
    margin-bottom: 42px;
  }

  .deepdoc-section {
    padding-bottom: 58px;
  }

  .deepdoc-section + .deepdoc-section {
    padding-top: 58px;
  }

  .decision-step {
    grid-template-columns: 1fr;
    gap: 8px;
  }

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

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 50px;
    padding-bottom: 48px;
  }

  .deepdoc-meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .deepdoc-section h3 {
    margin-top: 32px;
  }

  .decision-step,
  .term-card {
    padding: 18px;
  }

  .deepdoc-promo {
    margin-top: 58px;
  }
}