.handbook-main {
  min-width: 0;
}

.handbook-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  gap: clamp(48px, 8vw, 112px);
  align-items: end;
  padding-top: clamp(72px, 10vw, 132px);
  padding-bottom: clamp(64px, 8vw, 108px);
}

.handbook-hero__copy {
  min-width: 0;
}

.handbook-hero h1 {
  margin-top: 24px;
}

.handbook-hero .lead {
  max-width: 64ch;
  margin-top: 28px;
}

.handbook-hero .chips {
  margin-top: 30px;
}

.handbook-hero__index {
  display: grid;
  min-width: 0;
  gap: 14px;
  align-content: end;
  border-left: 1px solid var(--color-line);
  padding-left: 34px;
}

.handbook-hero__index p:last-child {
  max-width: 28ch;
  color: var(--color-ink-muted);
  font-size: 14px;
}

.handbook-hero__mark {
  display: block;
  width: 120px;
  height: 120px;
  margin-bottom: 14px;
}

.handbook-hero__mark svg {
  width: 100%;
  height: 100%;
}

.handbook-hero__mark circle,
.handbook-hero__mark path {
  stroke-width: 1;
}

.handbook-article {
  padding-top: clamp(72px, 8vw, 112px);
  padding-bottom: var(--section-space);
}

.handbook-preface {
  padding-bottom: clamp(72px, 9vw, 120px);
}

.handbook-preface h2 {
  margin-top: 18px;
}

.handbook-preface .prose {
  margin-top: 30px;
}

.handbook-chapter {
  position: relative;
  padding-top: clamp(72px, 9vw, 124px);
  padding-bottom: clamp(72px, 9vw, 124px);
  border-top: 1px solid var(--color-line);
}

.handbook-chapter__head {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 34px;
  align-items: start;
  margin-bottom: 42px;
}

.handbook-chapter__code {
  padding-top: 10px;
  color: var(--color-signal);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.handbook-chapter .prose h3 {
  position: relative;
  padding-left: 24px;
}

.handbook-chapter .prose h3::before {
  position: absolute;
  top: 0.65em;
  left: 0;
  width: 10px;
  height: 1px;
  content: "";
  background: var(--color-signal);
}

.handbook-chapter .prose p {
  text-align: justify;
  text-justify: inter-ideograph;
}

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

.handbook-chapter pre {
  position: relative;
  margin-top: 34px;
  margin-bottom: 34px;
  padding-top: 46px;
}

.handbook-chapter pre::before {
  position: absolute;
  top: 17px;
  left: 20px;
  width: 7px;
  height: 7px;
  content: "";
  border-radius: var(--radius-pill);
  background: var(--color-negative);
  box-shadow:
    14px 0 0 var(--color-caution),
    28px 0 0 var(--color-positive);
}

.handbook-chapter .callout {
  margin-top: 36px;
  margin-bottom: 36px;
}

.handbook-next {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  border-top: 1px solid var(--color-line);
}

.handbook-next h2 {
  margin-top: 16px;
}

.handbook-next__links {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 48px;
  border-top: 1px solid var(--color-line);
  border-left: 1px solid var(--color-line);
}

.handbook-next__links a {
  display: grid;
  min-width: 0;
  min-height: 190px;
  align-content: start;
  gap: 12px;
  padding: 26px;
  border-right: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  transition:
    color var(--motion-fast) ease,
    background-color var(--motion-fast) ease;
}

.handbook-next__links a:hover {
  color: var(--color-signal);
  background: var(--color-panel);
}

.handbook-next__links .mono {
  color: var(--color-ink-muted);
  font-size: 10px;
  letter-spacing: 0.1em;
}

.handbook-next__links strong {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
}

.handbook-next__links small {
  color: var(--color-ink-muted);
  font-size: 13px;
}

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

  .handbook-hero__index {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    border-top: 1px solid var(--color-line);
    border-left: 0;
    padding-top: 28px;
    padding-left: 0;
  }

  .handbook-hero__mark {
    grid-row: span 2;
    margin-bottom: 0;
  }

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

@media (max-width: 640px) {
  .handbook-hero {
    gap: 38px;
    padding-top: 52px;
    padding-bottom: 54px;
  }

  .handbook-hero__index {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 8px 16px;
  }

  .handbook-hero__mark {
    width: 72px;
    height: 72px;
  }

  .handbook-chapter__head {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 32px;
  }

  .handbook-chapter__code {
    padding-top: 0;
  }

  .handbook-chapter .prose p {
    text-align: left;
  }

  .handbook-next__links {
    grid-template-columns: 1fr;
  }

  .handbook-next__links a {
    min-height: 0;
  }
}