.manual-hero {
  position: relative;
  padding-top: clamp(54px, 8vw, 96px);
  padding-bottom: clamp(42px, 7vw, 78px);
  overflow-x: clip;
  text-align: center;
}

.manual-hero::before {
  position: absolute;
  top: -30%;
  left: 50%;
  z-index: -1;
  width: min(920px, 100%);
  height: 620px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, var(--color-accent-glow), transparent 72%);
  content: "";
  pointer-events: none;
}

.manual-hero .kicker {
  margin-top: 24px;
}

.manual-hero h1 {
  max-width: 780px;
  margin-inline: auto;
}

.manual-lead {
  max-width: 720px;
  margin: 0 auto;
  color: var(--color-text-muted);
  font-size: clamp(17px, 1.8vw, 20px);
  line-height: 1.8;
}

.manual-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 30px;
  gap: 14px;
}

.manual-relation {
  margin-top: clamp(38px, 6vw, 64px);
  text-align: left;
}

.manual-relation strong {
  display: block;
  margin-bottom: 10px;
  color: var(--color-text);
  font-size: 18px;
}

.manual-relation p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.manual-toc-wrap {
  position: relative;
  z-index: 12;
}

.manual-body {
  padding-top: clamp(44px, 7vw, 78px);
}

.manual-chapter {
  padding-top: clamp(58px, 8vw, 96px);
  padding-bottom: clamp(58px, 8vw, 96px);
}

.manual-chapter + .manual-chapter {
  border-top: 1px solid var(--color-line);
}

.chapter-head {
  display: flex;
  margin-bottom: 38px;
  align-items: flex-start;
  gap: 20px;
}

.chapter-head .kicker {
  margin-bottom: 8px;
}

.chapter-head h2 {
  margin-bottom: 0;
}

.chapter-index {
  display: grid;
  width: 56px;
  height: 56px;
  flex: 0 0 56px;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: var(--shadow-lift);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
}

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

.manual-chapter h3:first-of-type {
  margin-top: 0;
}

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

.manual-chapter .table-scroll,
.manual-chapter pre {
  margin-top: 30px;
  margin-bottom: 34px;
}

.manual-chapter .data-table {
  min-width: 700px;
}

.diagnosis-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 34px;
  margin-bottom: 38px;
  gap: 14px;
}

.diagnosis-flow div {
  position: relative;
  padding: 22px 18px;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-text-muted);
  box-shadow: var(--shadow-soft);
}

.diagnosis-flow div:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -13px;
  z-index: 2;
  color: var(--color-accent);
  content: "→";
  font-family: var(--font-mono);
  font-weight: 800;
  transform: translateY(-50%);
}

.diagnosis-flow strong,
.diagnosis-flow span {
  display: block;
}

.diagnosis-flow strong {
  margin-bottom: 6px;
  color: var(--color-text);
}

.diagnosis-flow span {
  font-size: 13px;
  line-height: 1.6;
}

.manual-body > .end-download-card {
  margin-bottom: clamp(54px, 8vw, 92px);
}

@media (max-width: 768px) {
  .manual-hero {
    padding-top: 42px;
  }

  .chapter-head {
    gap: 14px;
  }

  .chapter-index {
    width: 46px;
    height: 46px;
    flex-basis: 46px;
    font-size: 12px;
  }

  .diagnosis-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .diagnosis-flow div:not(:last-child)::after {
    display: none;
  }
}

@media (max-width: 640px) {
  .manual-links .button {
    width: 100%;
  }

  .manual-relation {
    padding: 24px 20px;
  }

  .manual-chapter {
    padding-top: 52px;
    padding-bottom: 52px;
  }

  .chapter-head {
    align-items: center;
  }

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

  .diagnosis-flow {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 390px) {
  .chapter-head {
    align-items: flex-start;
    flex-direction: column;
  }
}