.handbook-hero {
  position: relative;
  overflow-x: clip;
  border-bottom: 1px solid var(--color-border);
}

.handbook-hero::before {
  content: "";
  position: absolute;
  top: 52px;
  right: -180px;
  width: 560px;
  height: 560px;
  border: 1px solid var(--color-accent-line);
  border-radius: 50%;
  box-shadow: var(--shadow-accent);
  opacity: 0.34;
  pointer-events: none;
}

.handbook-hero-grid {
  position: relative;
  padding-top: clamp(64px, 9vw, 112px);
  padding-bottom: clamp(52px, 8vw, 94px);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  align-items: end;
  gap: clamp(34px, 7vw, 92px);
}

.handbook-hero-copy {
  position: relative;
  z-index: 2;
}

.handbook-hero-copy h1 {
  max-width: 900px;
}

.handbook-hero-copy .lead {
  margin-bottom: 0;
}

.handbook-hero-actions {
  margin-top: 26px;
}

.handbook-fact-sheet {
  position: relative;
  z-index: 2;
  padding: 22px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-panel-glass);
  box-shadow: var(--shadow-panel);
}

.handbook-fact-title {
  margin-bottom: 15px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.handbook-fact-list {
  margin: 0;
  padding: 0;
  display: grid;
  list-style: none;
}

.handbook-fact-list li {
  padding: 11px 0;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.82rem;
}

.handbook-fact-list li:last-child {
  border-bottom: 0;
}

.handbook-fact-list span {
  color: var(--color-text-faint);
  font-family: var(--font-mono);
}

.handbook-fact-list strong {
  font-weight: 700;
}

.handbook-toc {
  margin-top: 0;
}

.handbook-layout {
  display: grid;
  grid-template-columns: 176px minmax(0, 1fr) 190px;
  align-items: start;
  gap: 28px;
}

.handbook-review-index,
.handbook-side-notes {
  position: sticky;
  top: 76px;
}

.handbook-review-index {
  padding: 17px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-deep);
}

.handbook-review-label,
.handbook-side-label {
  margin-bottom: 13px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.handbook-review-index ol {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 5px;
  list-style: none;
  counter-reset: handbook-section;
}

.handbook-review-index li {
  counter-increment: handbook-section;
}

.handbook-review-index a {
  min-height: 42px;
  padding: 8px 7px;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 0.72rem;
  line-height: 1.45;
}

.handbook-review-index a::before {
  content: counter(handbook-section, decimal-leading-zero);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.58rem;
}

.handbook-review-index a:hover {
  color: var(--color-text);
  background: var(--color-bg-panel-2);
}

.handbook-article {
  min-width: 0;
  padding: clamp(23px, 4vw, 46px);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xl);
  background: var(--color-bg-panel);
  box-shadow: var(--shadow-panel);
}

.handbook-article > h2:first-child {
  margin-top: 0;
}

.handbook-article h2 {
  padding-top: 0.25em;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--color-border);
}

.handbook-article h2::before {
  content: "REFERENCE";
  margin-bottom: 8px;
  display: block;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
}

.handbook-article h3 {
  color: var(--color-white-soft);
}

.handbook-article section + section {
  margin-top: clamp(68px, 9vw, 104px);
}

.handbook-article section {
  scroll-margin-top: calc(var(--nav-height) + 24px);
}

.handbook-article .data-table td:first-child {
  color: var(--color-text);
  font-weight: 700;
}

.handbook-side-notes {
  display: grid;
  gap: 14px;
}

.handbook-side-card {
  padding: 17px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-panel-2);
  box-shadow: var(--shadow-soft);
}

.handbook-side-card h3 {
  margin-bottom: 9px;
  font-size: 0.94rem;
}

.handbook-side-card p,
.handbook-side-card li {
  font-size: 0.74rem;
  line-height: 1.65;
}

.handbook-side-card p:last-child,
.handbook-side-card ul:last-child {
  margin-bottom: 0;
}

.handbook-side-card ul {
  padding-left: 1.1em;
}

.handbook-side-card a {
  color: var(--color-accent);
}

.selection-path {
  margin: 26px 0;
  padding: 0;
  display: grid;
  gap: 11px;
  list-style: none;
  counter-reset: selection-step;
}

.selection-path li {
  position: relative;
  padding: 18px 18px 18px 58px;
  counter-increment: selection-step;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-deep);
}

.selection-path li::before {
  content: counter(selection-step);
  position: absolute;
  top: 18px;
  left: 17px;
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-accent-dark);
  border-radius: 50%;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 800;
}

.selection-path strong {
  display: block;
  margin-bottom: 5px;
}

.selection-path p {
  margin-bottom: 0;
}

.protocol-verdict {
  margin: 28px 0;
  padding: 20px;
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 18px;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
}

.protocol-verdict-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.protocol-verdict p {
  margin: 0;
}

@media (max-width: 1120px) {
  .handbook-layout {
    grid-template-columns: 154px minmax(0, 1fr);
  }

  .handbook-side-notes {
    position: static;
    grid-column: 1 / -1;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .handbook-hero-grid,
  .handbook-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .handbook-fact-sheet {
    max-width: 580px;
  }

  .handbook-review-index {
    position: static;
  }

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

  .handbook-side-notes {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .handbook-hero-grid {
    padding-top: 46px;
    padding-bottom: 48px;
  }

  .handbook-fact-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 3px;
  }

  .handbook-review-index ol {
    grid-template-columns: minmax(0, 1fr);
  }

  .handbook-article {
    padding: 21px;
    border-radius: var(--radius-lg);
  }

  .protocol-verdict {
    grid-template-columns: minmax(0, 1fr);
    gap: 7px;
  }

  .selection-path li {
    padding-right: 15px;
  }
}