[data-index] { position: sticky; top: 24px; background: #000; color: #fff; border-radius: 8px; padding: 24px 16px; min-width: 0; }
[data-index] > header { margin: 0 8px 32px; }
[data-index] > header > a:first-child { display: flex; gap: 12px; align-items: center; color: #fff; text-decoration: none; min-height: 56px; }
[data-mark] { display: grid; place-items: center; min-width: 40px; height: 40px; background: var(--blue); border-radius: 50%; color: #000; font-size: 1.5rem; font-weight: 700; }
[data-index] header strong { font-size: 1.375rem; display: block; letter-spacing: .025em; line-height: 1.25; }
[data-index] header a > span > span { display: block; font-size: 1rem; line-height: 1.3; margin-top: 4px; color: #e6e6e6; }
[data-index] header p { font-size: 1rem; color: #b9eaff; margin: 16px 0 0; }
[data-index] nav summary { font-size: 1rem; color: #fff; min-height: 44px; padding: 8px; font-weight: 600; cursor: pointer; }
[data-index] nav ul { list-style: none; padding: 8px 0 0; margin: 0; }
[data-index] nav li { margin: 4px 0; }
[data-index] nav a { display: flex; justify-content: space-between; align-items: center; gap: 8px; color: #eee; font-size: 1rem; min-height: 48px; padding: 10px 12px; text-decoration: none; border-radius: 4px; line-height: 1.4; border-left: 2px solid transparent; }
[data-index] nav a span { color: #9d9d9d; font-size: 1rem; }
[data-index] nav a:hover { background: #252525; }
[data-index] nav a[aria-current="page"] { background: var(--blue); color: #000; border-left-color: var(--green); font-weight: 650; }
[data-index] nav a[aria-current="page"] span { color: #000; }
[data-index] :focus-visible { outline-color: var(--cyan); }
[data-index-note] { display: flex; gap: 12px; align-items: flex-start; margin: 32px 8px 8px; border-top: 1px solid #444; padding-top: 24px; }
[data-index-note] p { font-size: 1rem; line-height: 1.5; color: #ddd; margin: 0; }
[data-dot] { width: 8px; height: 8px; border-radius: 50%; background: var(--green); flex-shrink: 0; margin-top: 8px; box-shadow: 0 0 16px #00ff0055; }
[data-mobile-index] { display: none; }
@media (max-width: 720px) {
  [data-index] { display: contents; }
  [data-index] > header { order: 0; width: 100%; color: #000; background: #f5f8fa; margin: 0; padding: 24px 0 16px; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; column-gap: 16px; }
  [data-index] > header > a:first-child { color: #000; grid-column: 1 / -1; gap: 12px; }
  [data-index] header a > span > span { color: var(--muted); }
  [data-index] header p { margin: 8px 0 0; color: var(--muted); line-height: 1.4; }
  [data-mobile-index] { display: inline-flex; align-items: center; min-height: 44px; color: var(--link); font-size: 1rem; padding: 8px 0; }
  [data-index] nav { order: 2; width: 100%; background: #000; border-radius: 8px; padding: 16px; margin: 8px 0 32px; scroll-margin-top: 16px; }
  [data-index] nav ul { display: grid; grid-template-columns: minmax(0, 1fr); }
  [data-index-note] { display: none; }
  [data-index] header :focus-visible { outline-color: var(--link); }
}