.deepdoc-hero {
  position: relative;
  overflow: clip;
  padding-top: clamp(72px, 9vw, 126px);
  padding-bottom: clamp(64px, 8vw, 112px);
}

.deepdoc-hero::before {
  position: absolute;
  z-index: -2;
  top: 8%;
  right: max(var(--gutter), calc((100vw - var(--page-width)) / 2));
  width: min(42vw, 560px);
  aspect-ratio: 1;
  border-radius: var(--radius-circle);
  background:
    radial-gradient(circle at 38% 32%, var(--color-ocean-bright), var(--color-ocean-mid) 36%, var(--color-ocean-dark) 68%, transparent 69%);
  opacity: .72;
  content: "";
}

.deepdoc-hero::after {
  position: absolute;
  z-index: -1;
  top: 20%;
  right: max(var(--gutter), calc((100vw - var(--page-width)) / 2));
  width: min(46vw, 620px);
  height: min(24vw, 310px);
  border-top: 1px dashed var(--color-accent-border);
  border-radius: var(--radius-circle);
  transform: rotate(-12deg);
  content: "";
}

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

.deepdoc-hero h1 {
  max-width: 820px;
  margin-top: 24px;
}

.deepdoc-meta {
  margin: 28px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
}

.deepdoc-meta li {
  max-width: 100%;
  min-height: 34px;
  padding: 0 13px;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-pill);
  background: var(--color-panel-soft);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: .74rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.deepdoc-intro-link {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-border);
  text-underline-offset: .24em;
}

.deepdoc-directory {
  padding-top: 0;
  padding-bottom: calc(var(--section-space) * .48);
}

.deepdoc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 3.2fr);
  align-items: start;
  gap: clamp(34px, 6vw, 82px);
}

.deepdoc-rail {
  position: sticky;
  top: calc(var(--toc-top) + var(--toc-height) + 24px);
  padding: 22px;
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: inset 0 0 0 1px var(--color-border);
}

.deepdoc-rail-title {
  margin: 0 0 14px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.deepdoc-rail p {
  margin: 0;
  color: var(--color-muted);
  font-size: .86rem;
  line-height: 1.75;
}

.deepdoc-rail p + p {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.deepdoc-content {
  max-width: 880px;
}

.deepdoc-chapter {
  padding-top: clamp(72px, 8vw, 112px);
  padding-bottom: clamp(72px, 8vw, 112px);
  border-top: 1px solid var(--color-border);
}

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

.deepdoc-chapter h2 {
  max-width: 760px;
}

.deepdoc-chapter h3 {
  margin-top: 2.8rem;
}

.deepdoc-chapter p,
.deepdoc-chapter li {
  color: var(--color-text-soft);
}

.deepdoc-chapter p {
  line-height: 1.95;
}

.deepdoc-chapter ul,
.deepdoc-chapter ol {
  padding-left: 1.4rem;
}

.deepdoc-chapter li + li {
  margin-top: .75rem;
}

.deepdoc-chapter a:not(.button) {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-border);
  text-underline-offset: .22em;
}

.deepdoc-table-note {
  margin: 12px 0 0;
  color: var(--color-muted);
  font-size: .82rem;
}

.deepdoc-checklist {
  margin: 28px 0;
  padding: 24px;
  display: grid;
  gap: 13px;
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: inset 0 0 0 1px var(--color-border);
  list-style: none;
}

.deepdoc-checklist li {
  position: relative;
  padding-left: 26px;
}

.deepdoc-checklist li::before {
  position: absolute;
  left: 0;
  color: var(--color-accent);
  content: "✓";
  font-family: var(--font-mono);
  font-weight: 700;
}

.deepdoc-code-label {
  margin: 30px 0 -12px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
}

.deepdoc-summary {
  padding-top: calc(var(--section-space) * .65);
  padding-bottom: var(--section-space);
}

.deepdoc-summary .promo-block {
  margin-top: 0;
}

@media (max-width: 960px) {
  .deepdoc-hero::before {
    top: 22%;
    right: -18%;
    width: 560px;
    opacity: .42;
  }

  .deepdoc-hero::after {
    right: -20%;
    width: 600px;
  }

  .deepdoc-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .deepdoc-rail {
    position: static;
  }

  .deepdoc-content {
    max-width: none;
  }
}

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 52px;
    padding-bottom: 68px;
  }

  .deepdoc-hero::before {
    top: 34%;
    right: -58%;
  }

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

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

  .deepdoc-meta li {
    width: fit-content;
  }

  .deepdoc-rail {
    padding: 20px;
  }

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

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