/* A Solutions page's step ladders (tools/solution_steps.py): each
   exercise folds its hint, the shape of its listing, and the answer
   into nested <details>, which the browser renders collapsed with
   no script at all. This styles the summary rows as the steps they
   are and indents each level; solutions.js adds the progress memory
   and the "hide everything" control. */

details.step {
  margin: 1.2rem 0;
  padding-left: 1rem;
  border-left: 2px solid var(--rule);
}
details.step[open] { border-left-color: var(--accent); }

details.step > summary {
  cursor: pointer;
  list-style: none;
  font-family: 'Cormorant SC', serif;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  user-select: none;
}
details.step > summary::-webkit-details-marker { display: none; }
details.step > summary::before {
  content: "\25B8";               /* a small triangle, pointing right */
  display: inline-block;
  width: 1.2em;
}
details.step[open] > summary::before { content: "\25BE"; }
details.step > summary:hover { color: var(--ink); }
details.step[open] > summary { margin-bottom: 0.8rem; }

/* The row above the first exercise: how many steps are open, and the
   control that closes them. Shown only once the script has run. */
.steps-bar {
  display: none;
  justify-content: space-between;
  align-items: baseline;
  margin: 0 0 1.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--rule);
  font-family: 'Cormorant SC', serif;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.steps-bar.ready { display: flex; }
.steps-bar button {
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  color: var(--accent);
  background: none;
  border: none;
  border-bottom: 1px solid var(--rule);
  padding: 0 0 1px;
  cursor: pointer;
}
.steps-bar button:hover { border-color: var(--accent); }
.steps-bar button[disabled] { color: var(--muted); cursor: default; }