.deepdoc-hero {
  position: relative;
  padding-top: 104px;
  padding-bottom: 92px;
  overflow: clip;
  border-bottom: 1px solid var(--color-border);
}

.deepdoc-hero::before,
.deepdoc-hero::after {
  position: absolute;
  pointer-events: none;
  border-radius: var(--radius-pill);
  content: "";
}

.deepdoc-hero::before {
  right: -180px;
  bottom: -310px;
  width: 720px;
  height: 620px;
  background: radial-gradient(closest-side, var(--color-glow-blue-soft), var(--color-fade) 72%);
}

.deepdoc-hero::after {
  right: 170px;
  bottom: -360px;
  width: 620px;
  height: 560px;
  background: radial-gradient(closest-side, var(--color-glow-pink-soft), var(--color-fade) 72%);
}

.deepdoc-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  gap: 72px;
  align-items: end;
}

.deepdoc-title-block {
  max-width: 850px;
}

.deepdoc-title-block h1 {
  max-width: 820px;
  font-size: clamp(30px, 4.2vw, 48px);
  line-height: 1.08;
}

.deepdoc-intro {
  max-width: 720px;
  margin-bottom: 30px;
  color: var(--color-text-muted);
  font-size: 17px;
}

.reference-index {
  padding: 25px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--gradient-panel);
  color: var(--color-text-muted);
}

.reference-index dl {
  display: grid;
  margin-bottom: 20px;
  gap: 0;
}

.reference-index dl div {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  align-items: baseline;
  padding-top: 13px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--color-border);
}

.reference-index dt {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 20px;
}

.reference-index dd {
  margin: 0;
  color: var(--color-text);
}

.reference-index p:last-child {
  margin-bottom: 0;
  font-size: 13px;
}

.deepdoc-guide {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
}

.deepdoc-guide .callout {
  margin-top: 0;
}

.deepdoc-guide .callout a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.deepdoc-guide .toc-tabs {
  position: relative;
  top: auto;
  margin-top: 28px;
  margin-bottom: 0;
  background: var(--color-bg);
}

.deepdoc-body {
  padding-top: 24px;
  padding-bottom: var(--section-space);
}

.doc-chapter {
  padding-top: 88px;
  padding-bottom: 20px;
  scroll-margin-top: calc(var(--header-height) + 12px);
}

.doc-chapter + .doc-chapter {
  margin-top: 52px;
  border-top: 1px solid var(--color-border);
}

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

.chapter-code {
  margin-bottom: 13px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
}

.doc-chapter h3 {
  margin-top: 1.9em;
}

.doc-chapter .table-wrap {
  margin-top: 30px;
  margin-bottom: 32px;
}

.doc-chapter pre {
  margin-top: 28px;
  margin-bottom: 28px;
}

.kernel-map {
  display: grid;
  margin-top: 34px;
  margin-bottom: 34px;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 12px;
  align-items: stretch;
}

.kernel-node {
  display: grid;
  min-height: 134px;
  align-content: center;
  gap: 9px;
  padding: 19px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  color: var(--color-text-muted);
  font-size: 13px;
}

.kernel-node.is-current {
  border-color: transparent;
  background: linear-gradient(var(--color-panel-raised), var(--color-panel-raised)) padding-box, var(--gradient-accent-soft) border-box;
}

.kernel-name {
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 15px;
}

.kernel-arrow {
  display: flex;
  align-items: center;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.decision-steps {
  margin-top: 28px;
  margin-bottom: 34px;
  padding-left: 1.4em;
}

.decision-steps li {
  margin-bottom: 12px;
  padding-left: 5px;
}

@media (max-width: 900px) {
  .deepdoc-hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .reference-index {
    max-width: 560px;
  }

  .kernel-map {
    grid-template-columns: 1fr;
  }

  .kernel-arrow {
    min-height: 24px;
    justify-content: center;
    transform: rotate(90deg);
  }
}

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 70px;
    padding-bottom: 64px;
  }

  .deepdoc-title-block h1 {
    font-size: clamp(24px, 7.5vw, 30px);
  }

  .deepdoc-intro {
    font-size: 15.5px;
  }

  .deepdoc-title-block .button-row .btn {
    flex: 1 1 100%;
  }

  .reference-index {
    padding: 20px;
  }

  .doc-chapter {
    padding-top: 68px;
  }

  .doc-chapter + .doc-chapter {
    margin-top: 34px;
  }

  .kernel-node {
    min-height: 0;
  }
}