.deepdoc-hero {
  position: relative;
  padding-top: 88px;
  padding-bottom: 72px;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--color-panel-muted), var(--color-bg));
}

.deepdoc-hero::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, transparent, var(--color-highlight-soft), transparent),
    radial-gradient(circle, var(--color-dot) 1px, transparent 1.3px);
  background-size: 100% 100%, 16px 16px;
  content: "";
  pointer-events: none;
}

.deepdoc-hero::after {
  position: absolute;
  top: 0;
  right: 7%;
  width: min(42vw, 560px);
  height: 100%;
  background: linear-gradient(120deg, transparent, var(--color-cyan-halo), var(--color-accent-tint));
  content: "";
  opacity: .75;
  clip-path: polygon(38% 0, 52% 0, 28% 100%, 14% 100%);
  pointer-events: none;
}

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

.deepdoc-hero-copy {
  max-width: 880px;
}

.deepdoc-hero h1 {
  max-width: 780px;
  margin-top: 16px;
}

.deepdoc-lead {
  max-width: 790px;
  margin-bottom: 28px;
  color: var(--color-text-muted);
  font-size: 20px;
  line-height: 1.7;
}

.deepdoc-facts {
  margin: 30px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
}

.deepdoc-facts li {
  min-height: 32px;
  padding: 5px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text-muted);
  font: 12px/1.6 var(--font-mono);
  box-shadow: inset 0 1px 0 var(--color-highlight);
}

.deepdoc-layout {
  padding-top: 72px;
  padding-bottom: 104px;
}

.deepdoc-layout.prose {
  max-width: var(--content-width);
}

.deepdoc-layout .toc-tabs {
  top: 12px;
}

.deepdoc-intro {
  max-width: var(--reading-width);
  margin: 0 auto 58px;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.deepdoc-intro p:last-child {
  margin-bottom: 0;
}

.deepdoc-section {
  max-width: var(--reading-width);
  margin-inline: auto;
  padding-top: 18px;
}

.deepdoc-section + .deepdoc-section {
  margin-top: 34px;
  padding-top: 72px;
  border-top: 1px solid var(--color-border);
}

.deepdoc-section > h2 {
  margin-top: 0;
}

.deepdoc-section h3 {
  font-size: clamp(22px, 2.3vw, 28px);
}

.deepdoc-section p {
  margin-bottom: 22px;
}

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

.deepdoc-section li {
  padding-left: 4px;
}

.deepdoc-section .table-scroll {
  margin: 30px 0;
}

.deepdoc-section .callout {
  margin: 30px 0;
}

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

.decision-card {
  padding: 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: 0 16px 34px -24px var(--color-accent-shadow), inset 0 1px 0 var(--color-highlight);
}

.decision-card h3,
.decision-card h4 {
  margin-top: 0;
}

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

.checklist {
  margin: 28px 0;
  padding: 0;
  display: grid;
  gap: 10px;
  list-style: none;
}

.checklist li {
  position: relative;
  padding: 14px 16px 14px 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
}

.checklist li::before {
  position: absolute;
  top: 15px;
  left: 16px;
  color: var(--color-success);
  content: "✓";
  font-weight: 700;
}

.guide-code {
  margin: 28px 0;
}

.guide-code-label {
  margin: 0 0 8px;
  color: var(--color-text-muted);
  font: 12px/1.5 var(--font-mono);
}

.summary-panel {
  margin-top: 44px;
  padding: 30px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, var(--color-panel), var(--color-accent-tint));
  box-shadow: var(--shadow-panel);
}

.summary-panel h3 {
  margin-top: 0;
}

.summary-panel p:last-child {
  margin-bottom: 0;
}

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

@media (max-width: 820px) {
  .deepdoc-hero {
    padding-top: 66px;
    padding-bottom: 58px;
  }

  .deepdoc-hero::after {
    right: 0;
    width: 52%;
    opacity: .48;
  }

  .deepdoc-lead {
    font-size: 18px;
  }

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

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 48px;
    padding-bottom: 46px;
  }

  .deepdoc-hero::after {
    display: none;
  }

  .deepdoc-layout {
    padding-top: 48px;
    padding-bottom: 78px;
  }

  .deepdoc-intro,
  .summary-panel {
    padding: 22px 18px;
  }

  .deepdoc-section + .deepdoc-section {
    margin-top: 20px;
    padding-top: 58px;
  }

  .deepdoc-facts {
    align-items: stretch;
    flex-direction: column;
  }

  .deepdoc-facts li {
    width: 100%;
    border-radius: var(--radius-sm);
  }
}