/* L8.1e: the tutorial index in the 760 reading column, Parts as group bands. */
.tutorial-series .tutorial-index { max-width: var(--reading-width); margin: 0; }
.tutorial-series .intro { padding: 0; }
.tutorial-series .part { margin: 44px 0 0; }
.tutorial-series .part-head {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  align-items: baseline;
  padding: 10px 12px;
  border-top: 2px solid var(--panel);
  border-bottom: 1px solid var(--border);
  background: var(--surface-strong);
}
.tutorial-series .part-num,
.tutorial-series .part-name {
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.07em;
  line-height: 1.35;
  text-transform: uppercase;
}
.tutorial-series .part-num { color: var(--link); }
.tutorial-series .part-name { color: var(--text); }
.tutorial-series .part-note { flex-basis: 100%; color: var(--muted); font-size: var(--type-small); }
.tutorial-series .chapters { margin: 0; padding: 0; list-style: none; }
.tutorial-series .chapters li { border-bottom: 1px solid var(--border); }
.tutorial-series .chapters a {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 4px;
  color: inherit;
  text-decoration: none;
}
@media (min-width: 780px) {
  .tutorial-series .chapters a { grid-template-columns: 38px minmax(0, 1fr) 190px; }
}
.tutorial-series .chapters a:hover { background: var(--surface); }
.tutorial-series .chapters a:hover .ch-title,
.tutorial-series .chapters a:focus-visible .ch-title { color: var(--link); text-decoration: underline; }
.tutorial-series .ch-n {
  padding-top: 4px;
  color: var(--link);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  font-weight: var(--weight-semibold);
}
.tutorial-series .ch-title { display: block; margin-bottom: 3px; font-size: var(--type-h3); font-weight: var(--weight-semibold); line-height: 1.35; }
.tutorial-series .ch-blurb { color: var(--muted); font-size: var(--type-small); }
.tutorial-series .ch-terms {
  padding-top: 4px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--type-label);
  line-height: 1.5;
}
@media (max-width: 779px) {
  .tutorial-series .ch-terms { grid-column: 2; padding-top: 0; }
}
.tutorial-series .howto {
  margin: 52px 0 0;
  padding: 20px 22px 6px;
  border-left: 4px solid var(--signal);
  background: var(--surface-muted);
}
.tutorial-series .howto h2 {
  margin: 0 0 12px;
  font-size: var(--type-h2);
  font-weight: var(--weight-semibold);
  line-height: 1.25;
}
.tutorial-series .colophon {
  margin-top: 48px;
  padding: 20px 0 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: var(--type-small);
}
@media (max-width: 560px) {
  .tutorial-series .howto h2 { font-size: 21px; }
}