.deepdoc-hero {
  position: relative;
  padding-top: clamp(64px, 8vw, 104px);
  padding-bottom: clamp(64px, 8vw, 104px);
  overflow-x: clip;
  background:
    radial-gradient(58% 80% at 88% 8%, var(--color-field-mint), transparent 72%),
    radial-gradient(52% 72% at 8% 92%, var(--color-field-sky), transparent 74%),
    linear-gradient(135deg, var(--color-panel), var(--color-bg));
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.deepdoc-hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 1px;
  content: "";
  background: var(--color-white-line);
}

.deepdoc-hero__inner {
  position: relative;
}

.deepdoc-hero h1 {
  max-width: 780px;
  margin-bottom: 22px;
}

.deepdoc-hero__lead {
  max-width: 780px;
  margin-bottom: 0;
  color: var(--color-muted);
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.8;
}

.deepdoc-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 28px;
}

.deepdoc-facts span {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 6px 12px;
  color: var(--color-accent-dark);
  background: var(--color-panel);
  border: 1px solid var(--color-accent-ring);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-mini);
  font-size: 13px;
  font-weight: 700;
}

.deepdoc-intro-note {
  max-width: 780px;
  margin-top: 34px;
  margin-bottom: 0;
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

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

.deepdoc-layout {
  display: grid;
  grid-template-columns: minmax(180px, 230px) minmax(0, 1fr);
  gap: clamp(34px, 5vw, 70px);
  align-items: start;
}

.deepdoc-toc {
  top: 20px;
  margin-bottom: 0;
  padding: 10px;
  flex-direction: column;
  overflow: visible;
}

.deepdoc-toc a {
  width: 100%;
  justify-content: flex-start;
}

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

.deepdoc-chapter {
  padding-bottom: clamp(70px, 8vw, 104px);
  border-bottom: 1px solid var(--color-border);
  scroll-margin-top: calc(var(--header-height) + 28px);
}

.deepdoc-chapter + .deepdoc-chapter {
  padding-top: clamp(70px, 8vw, 104px);
}

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

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

.deepdoc-chapter h3 {
  margin-top: 1.9em;
  font-size: clamp(20px, 2vw, 25px);
}

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

.deepdoc-chapter > p {
  line-height: 1.86;
}

.chapter-index {
  margin-bottom: 12px;
  color: var(--color-accent-dark) !important;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.deepdoc-chapter pre {
  margin-block: 26px;
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.deepdoc-chapter .table-wrap {
  margin-block: 28px;
  box-shadow: var(--shadow-card);
}

.deepdoc-chapter .callout {
  margin-block: 30px;
}

.diagnostic-steps {
  margin-top: 34px;
  padding: clamp(22px, 4vw, 34px);
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.diagnostic-steps h3 {
  margin-top: 0;
}

.diagnostic-steps ol {
  margin-bottom: 0;
  padding-left: 1.4em;
}

.diagnostic-steps li {
  margin-top: 12px;
  color: var(--color-muted);
}

.diagnostic-steps li::marker {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-weight: 700;
}

.diagnostic-steps strong {
  color: var(--color-text);
}

@media (max-width: 900px) {
  .deepdoc-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .deepdoc-toc {
    top: 8px;
    flex-direction: row;
    overflow-x: auto;
  }

  .deepdoc-toc a {
    width: auto;
    justify-content: center;
  }

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

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 54px;
    padding-bottom: 58px;
  }

  .deepdoc-hero__lead {
    font-size: 16px;
    line-height: 1.75;
  }

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

  .deepdoc-facts span {
    width: 100%;
    justify-content: center;
  }

  .deepdoc-chapter h3 {
    font-size: 20px;
  }

  .deepdoc-chapter pre {
    padding: 16px;
    font-size: 12px;
  }
}