/* Shared navigation and narrow-screen layout for the imported handbook. */
body { overflow-wrap: anywhere; }
main, aside, section, .card, .metric { min-width: 0; }
.hero-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.code, .formula, .diagram, .flow { max-width: 100%; overflow-x: auto; }
.code { overflow-wrap: normal; }
.table-scroll { max-width: 100%; overflow-x: auto; margin: 18px 0; }
.table-scroll table { min-width: 560px; }
nav.handbook-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
}
nav.handbook-nav a {
  display: inline-block;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  background: var(--panel);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
}
nav.handbook-nav a:hover { border-color: var(--cyan); color: var(--cyan); }
nav.handbook-nav a:focus-visible, .table-scroll:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
nav.handbook-nav.chapter-end { margin: 32px 0 0; }
.handbook-index .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.handbook-index .card { grid-template-columns: 60px minmax(0, 1fr) 36px; }
@media (max-width: 980px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  aside nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-grid, .grid2, .grid3, .grid4 { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 760px) {
  .handbook-index .grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 480px) {
  .handbook-index .card { grid-template-columns: 44px minmax(0, 1fr) 20px; gap: 10px; padding: 18px; }
  .handbook-index .num { width: 44px; height: 44px; }
}