/* ═══════════════════════════════════════════════════════
   P-AST.CSS — Concept-explainer page for the proprietary
   Pooled Antibiotic Susceptibility Testing technology.
   Brand purple primary; green accents on the proof points.
   Classes prefixed `pa-`.
   ═══════════════════════════════════════════════════════ */


/* ── HERO ──────────────────────────────────────────────
   Big editorial title with the P-AST wordmark dominant.
   Soft purple → green gradient backdrop signaling brand
   primary plus the proof / evidence family. */
.pa-hero {
  position: relative;
  padding: var(--gap-3xl) 0 var(--gap-2xl);
  background:
    radial-gradient(ellipse 70% 60% at 25% 15%, rgba(57, 55, 143, 0.18) 0%, transparent 60%),
    radial-gradient(ellipse 60% 60% at 85% 85%, rgba(0, 174, 129, 0.14) 0%, transparent 60%),
    linear-gradient(180deg, #f5f3ff 0%, #ffffff 70%);
  overflow: hidden;
  text-align: center;
}

.pa-hero__overline {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-green-dark);
  margin: 0 0 var(--gap-md);
}

.pa-hero__wordmark {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(3rem, 9vw, 7rem);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--color-purple);
  margin: 0 0 var(--gap-md);
}

.pa-hero__wordmark em {
  font-style: italic;
  color: var(--color-green-dark);
}

.pa-hero__wordmark sup {
  font-size: 0.35em;
  vertical-align: super;
  font-weight: 500;
  letter-spacing: 0;
}

.pa-hero__title {
  font-family: var(--font-body);
  font-size: clamp(1.1rem, 1.6vw, 1.4rem);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-purple-mid);
  margin: 0 0 var(--gap-lg);
}

.pa-hero__lede {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.55;
  color: var(--on-surface);
  font-weight: 500;
  margin: 0 auto;
  max-width: 640px;
}


/* ── PROBLEM SECTION ──────────────────────────────────
   Two-card grid framing the clinical problem. */
.pa-problem {
  padding: var(--gap-3xl) 0;
  background: var(--surface);
}

.pa-problem__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--gap-2xl);
}

.pa-problem__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-purple);
  margin: var(--gap-sm) 0 var(--gap-md);
}

.pa-problem__title em {
  font-style: italic;
  color: var(--color-green-dark);
}

.pa-problem__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
}

@media (min-width: 768px) { .pa-problem__grid { grid-template-columns: 1fr 1fr; } }

.pa-problem__card {
  padding: var(--gap-xl);
  background: #ffffff;
  border: 1px solid rgba(57, 55, 143, 0.10);
  border-radius: var(--radius-xl);
  box-shadow: 0 1px 0 rgba(57, 55, 143, 0.04);
  display: flex;
  flex-direction: column;
}

.pa-problem__stat {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(2.75rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-green-dark);
  margin: 0 0 var(--gap-md);
}

.pa-problem__stat span {
  font-size: 0.55em;
  font-style: normal;
  color: var(--color-green-dark);
  margin-left: 2px;
  font-weight: 500;
}

.pa-problem__heading {
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-purple);
  margin: 0 0 var(--gap-sm);
  line-height: 1.3;
}

.pa-problem__body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--on-surface-variant);
  margin: 0;
}

.pa-problem__body sup { color: var(--color-green-dark); font-weight: 600; }


/* ── COMPARISON: STANDARD vs P-AST ────────────────────
   The central concept: testing in isolation vs pooled.
   Two-up layout with simple SVG diagrams. */
.pa-compare {
  padding: var(--gap-3xl) 0;
  background: linear-gradient(180deg, #ffffff 0%, rgba(57, 55, 143, 0.05) 100%);
}

.pa-compare__header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto var(--gap-2xl);
}

.pa-compare__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-purple);
  margin: var(--gap-sm) 0 var(--gap-md);
}

.pa-compare__title em {
  font-style: italic;
  color: var(--color-green-dark);
}

.pa-compare__lede {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.55;
  color: var(--on-surface-variant);
  margin: 0;
}

.pa-compare__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
  margin-top: var(--gap-xl);
}

@media (min-width: 900px) { .pa-compare__grid { grid-template-columns: 1fr 1fr; gap: var(--gap-xl); } }

.pa-compare__card {
  padding: var(--gap-xl);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
}

.pa-compare__card--standard {
  background: #ffffff;
  border: 1px solid rgba(57, 55, 143, 0.12);
}

.pa-compare__card--past {
  background: linear-gradient(180deg, #ffffff 0%, rgba(0, 174, 129, 0.06) 100%);
  border: 2px solid rgba(0, 174, 129, 0.30);
  box-shadow: 0 12px 32px -16px rgba(0, 174, 129, 0.30);
}

.pa-compare__tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  margin-bottom: var(--gap-md);
  align-self: flex-start;
}

.pa-compare__card--standard .pa-compare__tag {
  color: var(--color-purple-mid);
  background: rgba(85, 84, 173, 0.10);
}

.pa-compare__card--past .pa-compare__tag {
  color: #ffffff;
  background: var(--color-green-dark);
}

.pa-compare__heading {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-purple);
  margin: 0 0 var(--gap-md);
}

.pa-compare__heading em { font-style: italic; }
.pa-compare__card--past .pa-compare__heading em { color: var(--color-green-dark); }

.pa-compare__diagram {
  margin: var(--gap-md) 0 var(--gap-lg);
  width: 100%;
  height: auto;
  max-height: 180px;
}

.pa-compare__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.pa-compare__list li {
  position: relative;
  padding-left: 22px;
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.5;
  color: var(--on-surface);
}

.pa-compare__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.pa-compare__card--standard .pa-compare__list li::before { background: var(--color-purple-mid); }
.pa-compare__card--past .pa-compare__list li::before { background: var(--color-green-dark); }


/* ── HOW IT WORKS (P-AST is personalized) ─────────────
   A single rich block explaining the personalized result. */
.pa-how {
  padding: var(--gap-3xl) 0;
  background: var(--surface);
}

.pa-how__inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.pa-how__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-purple);
  margin: var(--gap-sm) 0 var(--gap-md);
}

.pa-how__title em {
  font-style: italic;
  color: var(--color-green-dark);
}

.pa-how__body {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.7;
  color: var(--on-surface);
  margin: 0;
}


/* ── TESTS USING P-AST ────────────────────────────────
   Two cards linking out to the test pages. */
.pa-tests {
  padding: var(--gap-3xl) 0;
  background: linear-gradient(180deg, #ffffff 0%, rgba(0, 174, 129, 0.06) 100%);
}

.pa-tests__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--gap-2xl);
}

.pa-tests__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-purple);
  margin: var(--gap-sm) 0 0;
}

.pa-tests__title em {
  font-style: italic;
  color: var(--color-green-dark);
}

.pa-tests__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
}

@media (min-width: 768px) { .pa-tests__grid { grid-template-columns: 1fr 1fr; } }

.pa-test-card {
  position: relative;
  padding: var(--gap-xl);
  background: #ffffff;
  border: 1px solid rgba(0, 174, 129, 0.20);
  border-radius: var(--radius-xl);
  box-shadow: 0 1px 0 rgba(57, 55, 143, 0.04);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  display: flex;
  flex-direction: column;
}

.pa-test-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 40px -12px rgba(0, 174, 129, 0.28);
}

.pa-test-card__tag {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-green-dark);
  margin: 0 0 var(--gap-sm);
}

.pa-test-card__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.75rem;
  color: var(--color-purple);
  margin: 0 0 var(--gap-sm);
  line-height: 1.2;
}

.pa-test-card__title em { font-style: italic; color: var(--color-green-dark); }

.pa-test-card__body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.55;
  color: var(--on-surface-variant);
  margin: 0 0 var(--gap-lg);
  flex-grow: 1;
}

.pa-test-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-green-dark);
  text-decoration: none;
  align-self: flex-start;
  transition: gap .2s ease, color .2s ease;
}

.pa-test-card__cta:hover {
  gap: 10px;
  color: var(--color-purple);
}

.pa-test-card__cta svg { width: 14px; height: 14px; }

/* Stretched-link pattern: card-level click target */
.pa-test-card__cta::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
}


/* ── REFERENCES — purple gradient (brand primary) ─────
   The page leans on the brand voice for its references
   rather than the green/green-dark we use on test pages. */
.references {
  background: linear-gradient(180deg, var(--color-purple) 0%, #25245d 100%);
}