/* ================================================================
   METHODOLOGY PAGE
   Inherits base typography + .page-hero / .page-section / .page-cta
   from pages.css.
================================================================ */

/* ---- Sticky outcome-style nav (mirrors features-nav pattern) ---- */
.method-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg-base);
  border-bottom: 1px solid var(--bg-border);
  padding: 0.6rem var(--space-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.method-nav__list {
  display: flex;
  gap: 0.4rem;
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: 1100px;
  justify-content: center;
  overflow-x: auto;
  scrollbar-width: none;
}

.method-nav__list::-webkit-scrollbar {
  display: none;
}

.method-nav__link {
  display: inline-block;
  padding: 0.4rem 0.95rem;
  border-radius: 99px;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.method-nav__link:hover {
  border-color: var(--green-muted);
  color: var(--text-primary);
}

.method-nav__link--active {
  border-color: var(--green-primary);
  color: var(--green-primary);
  background: var(--green-glow);
}

/* ---- Data source cards (Section 1) ---- */
.method-sources {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  list-style: none;
  padding: 0;
  margin: 0;
}

@media (min-width: 700px) {
  .method-sources { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .method-sources { grid-template-columns: repeat(3, 1fr); }
}

.method-source {
  padding: 1.4rem;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.method-source__head {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.method-source__badge {
  display: inline-block;
  align-self: flex-start;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.18rem 0.55rem;
  border-radius: 99px;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  color: var(--text-secondary);
}

.method-source__badge--green {
  color: var(--green-primary);
  border-color: var(--green-muted);
  background: var(--green-glow);
}

.method-source__badge--blue {
  color: var(--teal-soft);
  border-color: var(--teal-soft);
  background: rgba(42, 157, 143, 0.08);
}

.method-source__badge--gold {
  color: var(--gold);
  border-color: var(--gold);
  background: rgba(212, 160, 23, 0.08);
}

.method-source__title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.25;
}

.method-source__desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
  font-weight: 300;
  margin: 0;
}

.method-source__tech {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--text-muted);
  margin: 0;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--bg-border);
}

/* ---- Model cards with expandable technical notes (Section 2) ---- */
.method-models {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  list-style: none;
  padding: 0;
  margin: 0;
}

@media (min-width: 900px) {
  .method-models { grid-template-columns: repeat(2, 1fr); }
}

.method-model {
  padding: 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
}

.method-model__title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin: 0 0 0.55rem 0;
}

.method-model__desc {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--text-secondary);
  font-weight: 300;
  margin: 0 0 1rem 0;
}

.method-model__details {
  border-top: 1px solid var(--bg-border);
  padding-top: 0.9rem;
}

.method-model__details summary {
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--green-primary);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  user-select: none;
  opacity: 0.85;
}

.method-model__details summary::-webkit-details-marker {
  display: none;
}

.method-model__details summary::before {
  content: '＋';
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1;
  width: 0.9rem;
  text-align: center;
  transition: transform 0.15s ease;
}

.method-model__details[open] summary::before {
  content: '−';
}

.method-model__details summary:hover {
  opacity: 1;
}

.method-model__details ul {
  margin: 0.85rem 0 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.method-model__details li {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-secondary);
  padding-left: 1.05rem;
  position: relative;
  font-weight: 300;
}

.method-model__details li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--green-muted);
  font-size: 0.75rem;
}

/* ---- Principle cards (Sections 3, 4) and Limitations (5) ---- */
.method-principles,
.method-limitations {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  list-style: none;
  padding: 0;
  margin: 0;
}

@media (min-width: 700px) {
  .method-principles,
  .method-limitations { grid-template-columns: repeat(2, 1fr); }
}

.method-principle,
.method-limitation {
  padding: 1.3rem;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
}

.method-principle__title,
.method-limitation__title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin: 0 0 0.5rem 0;
}

.method-limitation__title {
  color: var(--gold);
}

.method-principle__desc,
.method-limitation__desc {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-secondary);
  font-weight: 300;
  margin: 0;
}