[data-role="side-index"] { padding: 48px 24px 32px 32px; align-self: start; position: sticky; top: 0; }
[data-role="wordmark"] { display: inline-flex; align-items: center; min-height: 48px; gap: 0; font-size: 24px; line-height: 1.2; font-weight: 600; letter-spacing: -0.035em; text-decoration: none; color: var(--ink); }
[data-role="wordmark"] span { color: var(--blue-text); }
[data-role="site-purpose"] { margin-top: 16px; max-width: 23ch; color: var(--muted); }
[data-role="desktop-index"] { margin-top: 40px; }
[data-role="side-index"] nav ul { padding: 0; margin: 0; list-style: none; display: grid; gap: 8px; }
[data-role="side-index"] nav a { display: flex; flex-direction: column; justify-content: center; min-height: 64px; padding: 8px 16px; gap: 0; text-decoration: none; color: var(--ink); border-left: 2px solid transparent; }
[data-role="side-index"] nav a > span:first-child { font-weight: 600; }
[data-role="side-index"] nav a:hover { background: #f9fafb; border-left-color: var(--violet); }
[data-role="side-index"] nav a[aria-current="page"] { color: var(--blue-text); border-left-color: var(--blue); background: #eff6ff; }
[data-role="index-hint"] { color: var(--muted); font-size: 16px; line-height: 1.5; }
[data-role="index-note"] { border-top: 1px solid var(--line); padding-top: 24px; margin-top: 32px; color: var(--muted); }
[data-role="mobile-index"] { display: none; }

@media (max-width: 1100px) and (min-width: 801px) {
  [data-role="side-index"] { padding-left: 24px; padding-right: 16px; }
  [data-role="side-index"] nav a { padding-inline: 12px; }
}
@media (max-width: 800px) {
  [data-role="side-index"] { position: static; padding: 16px 24px 0; }
  [data-role="wordmark"] { min-height: 48px; }
  [data-role="site-purpose"] { margin-top: 8px; max-width: none; }
  [data-role="desktop-index"], [data-role="index-note"] { display: none; }
  [data-role="mobile-index"] { display: block; margin-top: 16px; }
  [data-role="mobile-index"] summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; border-block: 1px solid var(--line); padding: 12px 0; list-style: none; color: var(--blue-text); cursor: pointer; }
  [data-role="mobile-index"] summary::-webkit-details-marker { display: none; }
  [data-role="mobile-index"][open] summary { border-bottom: 0; }
  [data-role="mobile-index"] nav { padding: 16px 0; border-bottom: 1px solid var(--line); }
}