.deepdoc-hero {
  position: relative;
  padding-top: clamp(72px, 9vw, 118px);
  padding-bottom: clamp(52px, 7vw, 88px);
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 78% 18%, var(--color-accent-soft), var(--color-transparent) 34%),
    linear-gradient(var(--color-bg), var(--color-bg));
}

.deepdoc-hero::before {
  content: "";
  position: absolute;
  inset: 52% 0 0;
  opacity: 0.68;
  background-image:
    linear-gradient(var(--color-grid-line) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid-line) 1px, var(--color-transparent) 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

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

.deepdoc-hero h1 {
  max-width: 760px;
  margin-top: 24px;
  margin-bottom: 18px;
}

.deepdoc-lead {
  max-width: 690px;
  margin-bottom: 24px;
  color: var(--color-text-muted);
  font-size: clamp(18px, 2.3vw, 22px);
  line-height: 1.75;
}

.deepdoc-facts {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.deepdoc-intro {
  position: relative;
  max-width: 720px;
  padding-top: 24px;
  padding-bottom: 24px;
  border-left: 3px solid var(--color-accent);
  box-shadow: var(--shadow-panel);
}

.deepdoc-intro p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.deepdoc-intro a,
.deepdoc-article a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-line);
  text-underline-offset: 0.18em;
}

.deepdoc-shell {
  position: relative;
  padding-top: clamp(38px, 5vw, 64px);
  padding-bottom: var(--section-space);
}

.deepdoc-shell > .toc-tabs {
  top: var(--toc-top);
  margin-bottom: 58px;
}

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

.deepdoc-section {
  position: relative;
  padding-top: 24px;
  padding-bottom: clamp(68px, 8vw, 108px);
}

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

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

.chapter-mark {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  margin-bottom: 18px;
  padding: 0 9px;
  border-left: 2px solid var(--color-accent);
  background: var(--color-panel-secondary);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
}

.deepdoc-section h2 {
  margin-top: 0;
  margin-bottom: 30px;
  scroll-margin-top: var(--toc-offset);
}

.deepdoc-section h3 {
  margin-top: 48px;
  margin-bottom: 14px;
  scroll-margin-top: var(--toc-offset);
}

.deepdoc-section p {
  color: var(--color-text-muted);
  line-height: 1.88;
}

.deepdoc-section h2 + p,
.deepdoc-section h3 + p {
  color: var(--color-text);
}

.deepdoc-section .callout {
  margin-top: 36px;
  margin-bottom: 36px;
}

.deepdoc-section .callout p {
  color: var(--color-text-muted);
}

.deepdoc-section .table-scroll {
  margin-top: 36px;
  margin-bottom: 40px;
}

.deepdoc-table td {
  min-width: 150px;
  line-height: 1.65;
}

.deepdoc-table td:first-child {
  min-width: 120px;
  font-family: var(--font-mono);
}

.deepdoc-section pre {
  margin-top: 24px;
  margin-bottom: 26px;
}

.deepdoc-section pre + p {
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .deepdoc-hero {
    padding-top: 58px;
    padding-bottom: 50px;
  }

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

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

  .deepdoc-intro {
    padding-top: 20px;
    padding-bottom: 20px;
  }

  .deepdoc-shell {
    padding-top: 26px;
  }

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

  .deepdoc-section {
    padding-top: 18px;
    padding-bottom: 72px;
  }

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

@media (max-width: 480px) {
  .deepdoc-facts {
    align-items: flex-start;
  }

  .deepdoc-facts .badge {
    max-width: 100%;
  }

  .deepdoc-section p {
    line-height: 1.82;
  }

  .chapter-mark {
    max-width: 100%;
    overflow-wrap: anywhere;
  }
}