/* ptx Track Landing — accent driven by [data-track] (see _ptx-track.css) */
.ptx-track { padding: var(--ptx-space-8) var(--ptx-space-4); background: var(--ptx-bg); }
.ptx-track__inner { max-width: 64rem; margin-inline: auto; container-type: inline-size; }

/* ---- Head ---- */
.ptx-track__head { max-width: 48rem; }
.ptx-track__headline {
  font-family: var(--ptx-font-display);
  font-size: var(--ptx-h1, clamp(2rem, 1.4rem + 3vw, 3.25rem));
  line-height: 1.1; color: var(--ptx-ink); margin: .25rem 0 var(--ptx-space-3);
}
.ptx-track__lede { font-size: 1.125rem; color: var(--ptx-secondary); max-width: 42rem; }
.ptx-track__lede > :last-child { margin-bottom: 0; }
.ptx-track__head .ptx-quick-answer { margin-top: var(--ptx-space-4); }

/* ---- Block scaffold ---- */
.ptx-track__block { margin-top: var(--ptx-space-8); }
.ptx-track__block-title {
  font-size: var(--ptx-h2, clamp(1.5rem, 1.2rem + 1.5vw, 2.25rem));
  color: var(--ptx-ink); margin: 0 0 var(--ptx-space-4);
  /* the one accent edge: a short rule under each section title */
  padding-bottom: .5rem; border-bottom: 3px solid var(--ptx-accent);
  display: inline-block;
}

/* ---- Problem ---- */
.ptx-track__problems { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--ptx-space-3); }
.ptx-track__problem-item {
  position: relative; padding-left: 1.75rem; color: var(--ptx-ink); font-size: 1.0625rem;
}
.ptx-track__problem-item::before {
  content: ""; position: absolute; left: 0; top: .55em;
  width: .6rem; height: .6rem; border-radius: 2px;
  background: var(--ptx-accent-red, #ff2b58); /* red mark = edge/line accent only */
}

/* ---- Solution cards ---- */
.ptx-track__cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--ptx-space-4); }
.ptx-track__card {
  position: relative; overflow: hidden;
  background: var(--ptx-surface); border: 1px solid var(--ptx-border);
  border-radius: 12px;
  padding: calc(var(--ptx-space-4) + 3px) var(--ptx-space-4) var(--ptx-space-4);
}
.ptx-track__card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--ptx-grad-bar); }
.ptx-track__card-title { font-size: var(--ptx-h3, 1.25rem); color: var(--ptx-ink); margin: 0 0 .5rem; }
.ptx-track__card-body { color: var(--ptx-secondary); font-size: .9375rem; }
.ptx-track__card-body > :last-child { margin-bottom: 0; }

/* ---- Proof metrics ---- */
.ptx-track__metrics {
  list-style: none; margin: 0; padding: var(--ptx-space-5) 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--ptx-space-4);
  border-block: 1px solid var(--ptx-border);
}
.ptx-track__metric { display: flex; flex-direction: column; gap: .25rem; }
.ptx-track__metric-value {
  font-family: var(--ptx-font-display); font-size: clamp(1.75rem, 1.3rem + 2vw, 2.5rem);
  line-height: 1; color: var(--ptx-accent); font-weight: 700;
}
.ptx-track__metric-unit { font-size: .6em; margin-left: .1em; }
.ptx-track__metric-label { font-size: .875rem; color: var(--ptx-secondary); }

/* ---- FAQ ---- */
.ptx-track__faqs { margin: 0; }
.ptx-track__faq-item { padding: var(--ptx-space-3) 0; border-bottom: 1px solid var(--ptx-border); }
.ptx-track__faq-q { font-weight: 700; color: var(--ptx-ink); margin: 0 0 .35rem; }
.ptx-track__faq-a { margin: 0; color: var(--ptx-secondary); }
.ptx-track__faq-a > :last-child { margin-bottom: 0; }

/* ---- CTA ---- */
.ptx-track__cta {
  margin-top: var(--ptx-space-8); padding: var(--ptx-space-6) var(--ptx-space-5);
  background: var(--ptx-track-tint); border: 1px solid var(--ptx-track-border); border-radius: 14px;
  display: flex; flex-direction: column; gap: var(--ptx-space-3); align-items: flex-start;
}
.ptx-track__cta-note { margin: 0; color: var(--ptx-ink); max-width: 44rem; font-size: 1.0625rem; }
.ptx-track__cta-btn {
  background: var(--ptx-primary); color: #fff; border: 0;
  padding: .85rem 1.6rem; border-radius: 8px; font-weight: 600;
}
.ptx-track__cta-btn:hover, .ptx-track__cta-btn:focus { background: var(--ptx-primary-hover); }
/* Dark mode: the accent button background is light, so flip the label to dark ink for AA. */
html[data-theme="dark"] .ptx-track__cta-btn { color: #0e1620; }
html[data-theme="dark"] .ptx-track__cta-btn:hover, html[data-theme="dark"] .ptx-track__cta-btn:focus { color: #0e1620; }

/* ---- Reveal (communicative motion) ---- */
.ptx-reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; transition-delay: calc(var(--ptx-card-i, 0) * 80ms); }
.ptx-reveal.is-in { opacity: 1; transform: none; }

/* ---- Responsive (container-driven) ---- */
@container (max-width: 52rem) {
  .ptx-track__cards { grid-template-columns: repeat(2, 1fr); }
  .ptx-track__metrics { grid-template-columns: repeat(2, 1fr); }
}
@container (max-width: 32rem) {
  .ptx-track__cards {