/* =========================================================
   PROJECT-FOCUS.CSS - pages for the focus projects
   Depends on style.css (tokens) and eda.css (components).
   ========================================================= */

.page-focus .pf-back-wrap { padding-top: var(--sp-6); }
.page-focus .pf-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: 500 var(--fs-xs)/1 var(--mono);
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.page-focus .pf-back::before { content: "\2190"; }
.page-focus .pf-back:hover { color: var(--accent); }

/* -------------------- Hero -------------------- */
.pf-hero {
  padding-block: var(--sp-5) clamp(20px, 4vh, 32px);
  border-bottom: 1px solid var(--border-line);
}
.pf-hero__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-bottom: var(--sp-3);
}
.pf-hero__domain {
  margin: 0;
  font: 500 var(--fs-xs)/1.5 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.pf-hero__title {
  margin: 0 0 var(--sp-2);
  font: 600 var(--fs-4xl)/1.1 var(--sans);
  letter-spacing: -0.02em;
  color: var(--text-main);
}
.pf-hero__subtitle {
  margin: 0 0 var(--sp-5);
  font: 400 var(--fs-lg)/1.45 var(--mono);
  color: var(--text-secondary);
}
.pf-hero__grid { display: grid; gap: var(--sp-4); }
@media (min-width: 900px) {
  .pf-hero__grid { grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr); align-items: start; }
}

/* -------------------- Numbered sections -------------------- */
.pf-section { padding-block: clamp(20px, 3vh, 32px); border-bottom: 1px solid var(--border-soft); }
.pf-section:last-of-type { border-bottom: 0; }
.pf-section__head {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--border-line);
}
.pf-section__num {
  font: 400 var(--fs-sm)/1 var(--mono);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
.pf-section__title {
  margin: 0;
  font: 500 var(--fs-xl)/1.2 var(--mono);
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--text-main);
}

.pf-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 0; }
.pf-list li {
  display: grid;
  grid-template-columns: minmax(0, 168px) minmax(0, 1fr);
  gap: var(--sp-3);
  padding: 7px 0;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  line-height: 1.6;
}
.pf-list li:last-child { border-bottom: 0; }
.pf-list li b {
  font: 500 var(--fs-xxs)/1.7 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
  /* A label longer than its column wraps inside it. It used to be
     nowrap, which let a long label run under the text beside it. */
  overflow-wrap: anywhere;
}

.pf-cols { display: grid; gap: var(--sp-4); }
@media (min-width: 860px) { .pf-cols { grid-template-columns: 1fr 1fr; align-items: start; } }

.pf-math-note { margin: var(--sp-3) 0 0; color: var(--text-secondary); font-size: var(--fs-sm); line-height: 1.65; }

@media (max-width: 640px) {
  .pf-hero__title { font-size: clamp(1.7rem, 8vw, 2.1rem); }
  .pf-hero__subtitle { font-size: var(--fs-sm); }
  .pf-list li { grid-template-columns: 1fr; gap: 2px; }
}