.manual-hero {
  position: relative;
  padding-top: 68px;
  padding-bottom: 58px;
  overflow-x: clip;
}

.manual-hero::before {
  position: absolute;
  top: -180px;
  right: -220px;
  width: 620px;
  height: 620px;
  border-radius: var(--radius-pill);
  background: radial-gradient(circle, var(--color-accent-soft), transparent 68%);
  content: "";
  pointer-events: none;
}

.manual-breadcrumb {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin-bottom: 20px;
  color: var(--color-text-soft);
  font-size: 13px;
}

.manual-breadcrumb a {
  color: var(--color-accent-dark);
}

.manual-hero-panel {
  position: relative;
  z-index: 1;
  padding: clamp(30px, 6vw, 66px);
  overflow: clip;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 88% 16%, var(--color-panel-tint), transparent 34%),
    var(--color-panel);
  box-shadow: var(--shadow-card);
}

.manual-hero-panel::after {
  position: absolute;
  right: 5%;
  bottom: -82px;
  width: 240px;
  height: 240px;
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-pill);
  content: "";
  pointer-events: none;
}

.manual-hero-panel h1 {
  max-width: 710px;
  margin-top: 18px;
}

.manual-hero-panel .lead {
  max-width: 720px;
  margin-top: 24px;
}

.manual-hero-panel .button-row {
  margin-top: 28px;
}

.manual-fact-line {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 24px;
}

.manual-shell {
  padding-bottom: var(--section-space);
}

.manual-intro {
  padding: 26px 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel-tint);
}

.manual-intro p:last-child {
  margin-bottom: 0;
}

.manual-shell .toc-tabs {
  margin-top: 34px;
}

.manual-content {
  position: relative;
}

.manual-content::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: -38px;
  width: 1px;
  background: linear-gradient(var(--color-accent), var(--color-cyan), var(--color-border));
  content: "";
}

.manual-chapter {
  position: relative;
  padding-top: 58px;
  padding-bottom: 58px;
  border-bottom: 1px solid var(--color-border);
}

.manual-chapter::before {
  position: absolute;
  top: 72px;
  left: -45px;
  width: 15px;
  height: 15px;
  border: 3px solid var(--color-panel);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-border-strong);
  content: "";
}

.manual-chapter:first-child {
  padding-top: 38px;
}

.manual-chapter:first-child::before {
  top: 52px;
}

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

.chapter-index {
  width: fit-content;
  margin-bottom: 12px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.manual-chapter h2 {
  max-width: 700px;
  margin-bottom: 30px;
}

.manual-chapter h3 {
  margin-top: 42px;
  margin-bottom: 14px;
  font-size: clamp(21px, 2.5vw, 26px);
}

.manual-chapter > p,
.manual-chapter > h3,
.manual-chapter > .callout,
.manual-chapter > .table-scroll,
.manual-chapter > pre {
  max-width: var(--reading-width);
}

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

.manual-chapter .table-scroll {
  margin-top: 28px;
  margin-bottom: 34px;
}

.manual-chapter pre {
  margin-top: 18px;
  margin-bottom: 22px;
}

.manual-finish {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  margin-top: 54px;
  padding: clamp(24px, 4vw, 36px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 92% 8%, var(--color-accent-soft), transparent 36%),
    var(--color-panel);
  box-shadow: var(--shadow-card);
}

.manual-finish h3 {
  margin-top: 18px;
  margin-bottom: 8px;
}

.manual-finish p {
  max-width: 560px;
  margin-bottom: 0;
}

.manual-finish .button-row {
  justify-content: flex-end;
}

@media (max-width: 900px) {
  .manual-content::before,
  .manual-chapter::before {
    display: none;
  }

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

  .manual-finish .button-row {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .manual-hero {
    padding-top: 38px;
    padding-bottom: 42px;
  }

  .manual-hero-panel {
    padding: 24px 20px;
    border-radius: var(--radius-lg);
  }

  .manual-hero-panel::after {
    display: none;
  }

  .manual-intro {
    padding: 21px 20px;
  }

  .manual-chapter {
    padding-top: 44px;
    padding-bottom: 44px;
  }

  .manual-chapter:first-child {
    padding-top: 30px;
  }

  .manual-chapter h2 {
    margin-bottom: 24px;
  }

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

  .manual-finish {
    margin-top: 42px;
    padding: 22px 20px;
  }

  .manual-finish .button-row,
  .manual-finish .button {
    width: 100%;
  }
}