.deepdoc-hero {
  padding-top: 82px;
  padding-bottom: 70px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.deepdoc-hero h1 {
  max-width: 760px;
  margin-bottom: 22px;
}

.deepdoc-hero__lead {
  max-width: 790px;
  margin-bottom: 26px;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.8;
}

.deepdoc-hero__lead a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.deepdoc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.deepdoc-meta span,
.deepdoc-meta time {
  display: inline-flex;
  max-width: 100%;
  min-height: 32px;
  align-items: center;
  padding-inline: 14px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.deepdoc-section {
  padding-top: 64px;
}

.document-layout {
  display: grid;
  grid-template-columns: 218px minmax(0, 1fr);
  align-items: start;
  gap: 56px;
}

.deepdoc-toc {
  top: 24px;
  flex-direction: column;
  overflow: visible;
  padding: 10px;
  border-radius: var(--radius-lg);
}

.deepdoc-toc a {
  width: 100%;
  min-height: 42px;
  white-space: normal;
}

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

.deepdoc-intro {
  margin-bottom: 54px;
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  color: var(--color-text) !important;
  font-size: 16px;
}

.manual-chapter {
  scroll-margin-top: 28px;
  padding-bottom: 76px;
  border-bottom: 1px solid var(--color-border);
}

.manual-chapter + .manual-chapter {
  padding-top: 76px;
}

.manual-chapter:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.manual-chapter h2 {
  margin-top: 0;
}

.manual-chapter h3 {
  margin-top: 42px;
  font-size: 23px;
}

.manual-chapter p {
  line-height: 1.9;
}

.manual-chapter .callout,
.manual-chapter .data-table,
.manual-chapter pre {
  margin-top: 30px;
  margin-bottom: 30px;
}

.chapter-index {
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.deepdoc-content .download-guide h2 {
  margin-top: 0;
}

.deepdoc-dl-fab {
  z-index: 46;
}

@media (max-width: 980px) {
  .document-layout {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .deepdoc-toc {
    top: 8px;
    flex-direction: row;
    overflow-x: auto;
    border-radius: var(--radius-lg);
  }

  .deepdoc-toc a {
    width: auto;
    white-space: nowrap;
  }

  .deepdoc-content {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .deepdoc-hero {
    padding-top: 58px;
    padding-bottom: 52px;
  }

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

  .deepdoc-section {
    padding-top: 42px;
  }

  .manual-chapter {
    scroll-margin-top: 88px;
    padding-bottom: 60px;
  }

  .manual-chapter + .manual-chapter {
    padding-top: 60px;
  }

  .manual-chapter h3 {
    margin-top: 34px;
    font-size: 21px;
  }
}

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 44px;
    padding-bottom: 44px;
  }

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

  .deepdoc-meta span,
  .deepdoc-meta time {
    width: 100%;
  }

  .deepdoc-intro {
    margin-bottom: 44px;
    padding: 20px;
  }

  .manual-chapter p {
    line-height: 1.82;
  }

  .deepdoc-dl-fab {
    right: 16px;
    bottom: 16px;
  }
}