:root {
  --deepdoc-hero-wash: linear-gradient(
    180deg,
    var(--color-orange-wash),
    var(--color-pink-wash),
    var(--color-purple-wash),
    var(--color-accent-wash)
  );
  --deepdoc-rule: color-mix(in srgb, var(--color-accent) 20%, var(--color-border));
  --deepdoc-marker: color-mix(in srgb, var(--color-purple) 9%, var(--color-panel));
  --deepdoc-code-shadow: 0 20px 42px color-mix(in srgb, var(--color-purple) 9%, transparent);
  --deepdoc-content-width: 900px;
}

.deepdoc-hero {
  position: relative;
  max-width: 100%;
  padding-top: 72px;
  padding-bottom: 64px;
  overflow-x: clip;
  border-bottom: var(--line-thin) solid var(--color-border);
  background:
    radial-gradient(circle at 14% 16%, var(--color-orange-wash), transparent 32%),
    radial-gradient(circle at 84% 22%, var(--color-purple-wash), transparent 34%),
    var(--deepdoc-hero-wash);
}

.deepdoc-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 42%;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, var(--color-bg));
}

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

.deepdoc-hero .hero-title {
  max-width: 820px;
  margin-bottom: 22px;
}

.deepdoc-hero .lead {
  margin-bottom: 30px;
}

.deepdoc-intro {
  max-width: 880px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 24px;
}

.deepdoc-intro-title {
  margin-bottom: 5px;
  font-weight: 850;
}

.deepdoc-intro p:not(.deepdoc-intro-title) {
  color: var(--color-text-muted);
  font-size: 14px;
}

.manual-facts {
  max-width: 980px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.manual-facts li {
  min-width: 0;
  padding: 16px;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-card), var(--highlight-inset);
}

.manual-facts span,
.manual-facts strong {
  display: block;
}

.manual-facts span {
  margin-bottom: 5px;
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 750;
  letter-spacing: 0.06em;
}

.manual-facts strong {
  overflow-wrap: anywhere;
  font-size: 13px;
  line-height: 1.5;
}

.manual-shell {
  position: relative;
  padding-top: 36px;
  padding-bottom: var(--section-space);
}

.manual-shell .toc-tabs {
  margin-bottom: 54px;
}

.manual-section {
  width: 100%;
  max-width: var(--deepdoc-content-width);
  margin-inline: auto;
  padding-top: 54px;
  padding-bottom: 54px;
  border-bottom: var(--line-thin) solid var(--deepdoc-rule);
}

.manual-section:first-of-type {
  padding-top: 14px;
}

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

.manual-section-head {
  position: relative;
  padding-left: 22px;
  margin-bottom: 34px;
}

.manual-section-head::before {
  content: "";
  position: absolute;
  top: 5px;
  bottom: 5px;
  left: 0;
  width: 5px;
  border-radius: var(--radius-pill);
  background: linear-gradient(180deg, var(--color-orange), var(--color-pink), var(--color-purple), var(--color-accent));
}

.chapter-mark {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  padding: 4px 10px;
  margin-bottom: 10px;
  border: var(--line-thin) solid color-mix(in srgb, var(--color-purple) 22%, var(--color-border));
  border-radius: var(--radius-pill);
  color: var(--color-purple);
  background: var(--deepdoc-marker);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.manual-section-head h2 {
  max-width: 780px;
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 850;
  line-height: 1.18;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.manual-section-head > p {
  max-width: 720px;
  margin-top: 12px;
  color: var(--color-text-muted);
  font-size: 17px;
}

.manual-section .prose {
  font-size: 16px;
  line-height: 1.82;
}

.manual-section .prose h3 {
  position: relative;
  padding-left: 18px;
}

.manual-section .prose h3::before {
  content: "";
  position: absolute;
  top: 0.48em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--color-sky), var(--color-accent));
  box-shadow: 0 0 0 5px var(--color-accent-wash);
}

.manual-section .prose p {
  color: color-mix(in srgb, var(--color-text) 88%, var(--color-text-muted));
}

.manual-section .callout {
  margin-top: 30px;
  margin-bottom: 30px;
}

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

.manual-section .callout-title {
  color: var(--color-text);
}

.manual-section .table-scroll {
  margin-top: 30px;
  margin-bottom: 30px;
}

.manual-section pre {
  margin-top: 28px;
  margin-bottom: 28px;
  border-color: color-mix(in srgb, var(--color-purple) 22%, var(--color-border));
  background:
    linear-gradient(135deg, var(--color-purple-wash), var(--color-accent-wash)),
    var(--color-panel-soft);
  box-shadow: var(--deepdoc-code-shadow), var(--highlight-inset);
}

.manual-section code {
  line-height: 1.7;
}

@media (max-width: 900px) {
  .manual-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .deepdoc-intro {
    grid-template-columns: 1fr;
  }

  .deepdoc-intro .btn {
    width: fit-content;
  }
}

@media (max-width: 640px) {
  .deepdoc-hero {
    padding-top: 48px;
    padding-bottom: 48px;
  }

  .deepdoc-intro {
    gap: 20px;
    padding: 20px;
  }

  .deepdoc-intro .btn {
    width: 100%;
  }

  .manual-facts {
    grid-template-columns: 1fr;
  }

  .manual-shell {
    padding-top: 24px;
    padding-bottom: 64px;
  }

  .manual-shell .toc-tabs {
    margin-bottom: 36px;
  }

  .manual-section {
    padding-top: 42px;
    padding-bottom: 42px;
  }

  .manual-section-head {
    padding-left: 16px;
    margin-bottom: 28px;
  }

  .manual-section-head::before {
    width: 4px;
  }

  .manual-section-head h2 {
    font-size: clamp(29px, 8vw, 36px);
  }

  .manual-section-head > p {
    font-size: 15px;
  }

  .manual-section .prose {
    font-size: 15px;
    line-height: 1.78;
  }

  .manual-section .prose h3 {
    padding-left: 16px;
  }

  .manual-section pre {
    padding: 16px;
  }
}