/* Demos: an index of cards by subject, and one page per program.
   Everything else comes from site.css. */

/* ── the index ────────────────────────────────────────────────────── */
.demogroup { padding: 40px 0 8px; }
.demogroup + .demogroup { padding-top: 20px; }
.demogroup h2 {
  font-family: var(--mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--faint);
  margin: 0 0 18px; padding-bottom: 10px; border-bottom: 1px solid var(--rule);
}
.demogrid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.demo {
  display: block; padding: 18px 20px 16px;
  background: var(--panel); border: 1px solid var(--rule-soft);
  border-radius: 8px; text-decoration: none; color: inherit;
  border-left: 3px solid transparent;
  /* opacity here duplicates .reveal's own transition: this rule's higher
     specificity (.demo beats .reveal) would otherwise wipe out .reveal's
     shorthand entirely and make the fade-in instant. transform is shared
     between the hover lift and the reveal settle, at one duration. */
  transition: border-left-color .25s var(--ease), transform .3s var(--ease),
              box-shadow .25s var(--ease), opacity .6s var(--ease);
  transition-delay: 0s, 0s, 0s, var(--reveal-delay, 0s);
}
.demo:hover {
  border-left-color: var(--accent); text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px -12px color-mix(in srgb, var(--ink) 30%, transparent);
}
.demo h3 {
  margin: 0 0 6px; font-size: 16px; font-weight: 600;
  font-family: var(--serif); letter-spacing: -.005em;
}
.demo p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.5; }
.demo .file {
  margin-top: 10px; font-family: var(--mono); font-size: 11px;
  color: var(--faint);
}

/* ── one demo ─────────────────────────────────────────────────────── */
.demomain { padding: 36px 0 88px; }
.demomain .wrap { max-width: 880px; }
.backlink { margin: 0 0 22px; font-size: 13.5px; }
.backlink a { color: var(--muted); text-decoration: none; }
.backlink a:hover { color: var(--accent); }

.demomain .eyebrow {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--faint); margin: 0 0 8px;
}
.demomain h1 {
  font-family: var(--serif); font-weight: 600; font-size: 38px;
  letter-spacing: -.018em; line-height: 1.12; margin: 0 0 10px;
  text-wrap: balance;
}
.demomain .lede {
  font-family: var(--serif); font-size: 19px; color: var(--muted);
  margin: 0 0 8px; max-width: 60ch;
}
.demomain .srcpath {
  font-family: var(--mono); font-size: 12px; color: var(--faint);
  margin: 0 0 28px;
}
.demomain h2 {
  font-family: var(--mono); font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--faint);
  margin: 40px 0 14px; padding-bottom: 9px; border-bottom: 1px solid var(--rule);
}
.demomain p { margin: 0 0 15px; max-width: 68ch; }

/* The figure leads: it is the fastest statement of what the program is
   for. Drawn light in both themes, like the ones in the documentation. */
.demofig {
  margin: 0 0 30px; padding: 16px 18px; background: #fff;
  border: 1px solid var(--rule-soft); border-radius: 10px;
}
.demofig svg { display: block; width: 100%; height: auto; }

.uses { margin: 0 0 16px; padding-left: 20px; }
.uses li {
  margin: 0 0 5px; font-family: var(--mono); font-size: 12.5px;
  color: var(--muted); line-height: 1.55;
}

.demomain .out {
  border: 1px solid var(--rule-soft); border-left: 3px solid var(--accent-2);
  border-radius: 8px; background: color-mix(in srgb, var(--accent-2) 5%, var(--panel));
  padding: 14px 18px; margin-bottom: 16px;
}
.demomain .out pre {
  background: none; border: none; padding: 0; margin: 0;
  font-size: 12.5px; line-height: 1.6; color: var(--muted);
}

.demomain pre.hl { font-size: 13px; line-height: 1.65; }

@media (max-width: 700px) {
  .demomain h1 { font-size: 30px; }
  .demogrid { grid-template-columns: 1fr; }
}

/* A figure too large to inline. Saying so is more useful than a blank
   space: a demo that draws five megabytes of vector graphics is telling
   you something about the demo. */
.bigfig {
  margin: 0 0 28px; padding: 14px 18px;
  border: 1px dashed var(--rule); border-radius: 8px;
  color: var(--muted); font-size: 14px;
}
.demomain h3 {
  font-family: var(--sans); font-size: 14px; font-weight: 600;
  letter-spacing: .01em; color: var(--ink);
  margin: 26px 0 8px; text-transform: none;
}
.demomain ul { margin: 0 0 16px; padding-left: 22px; max-width: 68ch; }
.demomain li { margin: 0 0 6px; }

/* ── the walk-through ─────────────────────────────────────────────── */
/* Each `#%%` cell of the script becomes one step: what it does, why, and
   the code that does it. The rule down the left ties the three together
   and separates one step from the next without a box round each. */
.step {
  margin: 0 0 26px;
  padding-left: 18px;
  border-left: 2px solid var(--rule);
  transition: border-left-color .25s var(--ease);
}
.step:hover { border-left-color: var(--accent); }
.step h3 {
  font-family: var(--sans); font-size: 15px; font-weight: 600;
  margin: 0 0 8px; color: var(--ink); letter-spacing: -.003em;
}
.step p { margin: 0 0 12px; font-size: 14.5px; max-width: 68ch; }
.step pre.hl { margin: 0; font-size: 12.5px; }

/* The figure is a result, not a header, so it is captioned as one. */
.demofig figcaption {
  margin-top: 10px; font-size: 12.5px; color: var(--faint);
  font-family: var(--mono);
}
.demomain .out .lbl {
  display: block; font-family: var(--mono); font-size: 10px;
  letter-spacing: .13em; text-transform: uppercase; color: var(--faint);
  margin-bottom: 5px;
}
.srcnote {
  font-size: 13.5px; color: var(--muted); margin: 0 0 14px;
}
.srcnote code { font-size: 12.5px; }