.manual-header {
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(800px 280px at 50% -120px, color-mix(in srgb, var(--brand) 32%, transparent), transparent 65%),
    var(--bg);
}

.manual-header-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
}

.manual-home-btn {
  justify-self: start;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: var(--card);
}

.manual-home-btn:hover { border-color: var(--brand); }

.manual-title {
  justify-self: center;
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  font-weight: 700;
}

.manual-actions { justify-self: end; }

.manual-actions a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  background: var(--card);
}

.manual-actions a:hover { color: var(--text); border-color: var(--brand); }

.manual-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  padding: 24px 16px 40px;
}

.manual-toc {
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  padding: 16px;
}

.manual-toc h2 { margin: 0 0 12px; font-size: 1rem; }

.manual-toc a {
  display: block;
  color: var(--text);
  text-decoration: none;
  padding: 6px 8px;
  border-radius: 8px;
  margin: 2px 0;
  font-size: .94rem;
}

.manual-toc a.level-2 { padding-left: 16px; color: var(--muted); }
.manual-toc a.level-3 { padding-left: 28px; color: var(--muted); font-size: .88rem; }
.manual-toc a.active,
.manual-toc a:hover { background: color-mix(in srgb, var(--brand) 18%, transparent); color: var(--text); }

.manual-content {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--card);
  padding: 24px clamp(20px, 3vw, 36px);
}

.manual-content h1 { font-size: clamp(1.7rem, 2.8vw, 2.3rem); margin-bottom: .6rem; }
.manual-content h2 { margin-top: 1.6rem; }
.manual-content h3 { margin-top: 1.2rem; }
.manual-content h1, .manual-content h2, .manual-content h3 { scroll-margin-top: 16px; }
.manual-content p, .manual-content ul { color: var(--muted); line-height: 1.65; }
.manual-content ul { padding-left: 1.25rem; }
.manual-content li { margin: .25rem 0; }
.manual-content strong { color: var(--text); }

.manual-content code {
  background: color-mix(in srgb, var(--border) 60%, transparent);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: .92em;
  color: var(--brand-dark);
}

.manual-content pre {
  background: #0b0c20;
  color: #f4f7ff;
  padding: 12px;
  border-radius: 10px;
  overflow: auto;
}

.manual-content img {
  display: block;
  width: 100%;
  max-width: 960px;
  height: auto;
  margin: 14px 0 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #0a0b1c;
}

.manual-content table { margin: 12px 0 18px; }

@media (max-width: 900px) {
  .manual-header-row {
    grid-template-columns: 1fr;
    justify-items: center;
  }
  .manual-home-btn, .manual-actions, .manual-title { justify-self: center; }
  .manual-layout { grid-template-columns: 1fr; }
  .manual-toc { position: static; max-height: none; }
}