/* ── Methodology Page ────────────────────────────────────────────── */

/* ── Hero ─────────────────────────────────────────────────────────── */
.meth-hero {
  background: var(--ink);
  padding: 7rem 5vw 5rem;
  border-bottom: 3px solid var(--accent);
  position: relative;
  overflow: hidden;
}

.meth-hero::before {
  content: '';
  position: absolute; inset: 0;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 80px,
    rgba(255,255,255,0.015) 80px,
    rgba(255,255,255,0.015) 81px
  );
  pointer-events: none;
}

.meth-hero-inner {
  max-width: 720px;
  position: relative; z-index: 2;
}

.meth-eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent2);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  display: flex; align-items: center; gap: 0.75rem;
}

.meth-eyebrow::before {
  content: ''; display: block;
  width: 28px; height: 1px; background: var(--accent2);
}

.meth-hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  color: #fff;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.meth-hero h1 em {
  font-style: italic;
  color: var(--accent2);
}

.meth-hero p {
  font-size: 1rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  max-width: 560px;
}

.meth-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid rgba(255,255,255,0.08);
}

.meth-toc a {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.4);
  padding: 0.65rem 1.1rem;
  text-decoration: none;
  border-right: 1px solid rgba(255,255,255,0.08);
  transition: all 0.2s;
  white-space: nowrap;
}

.meth-toc a:last-child { border-right: none; }
.meth-toc a:hover {
  color: #fff;
  background: rgba(255,255,255,0.04);
}

/* ── Sections ────────────────────────────────────────────────────── */
.meth-section {
  padding: 5rem 5vw;
  background: var(--paper);
}

.meth-section.alt { background: var(--paper2); }

.meth-section-inner {
  max-width: 900px;
}

.meth-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: flex; align-items: center; gap: 0.75rem;
}

.meth-label::before {
  content: ''; display: block;
  width: 24px; height: 1px; background: var(--accent);
}

.meth-section h2 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  color: var(--ink);
  margin-bottom: 1.25rem;
}

.meth-section h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  color: var(--ink);
  margin: 2rem 0 0.75rem;
}

.meth-section p {
  font-size: 0.95rem;
  color: #2D3448;
  line-height: 1.85;
  margin-bottom: 1rem;
  max-width: 740px;
}

/* ── Formula block ───────────────────────────────────────────────── */
.meth-formula-block {
  background: var(--ink);
  padding: 2rem 2.5rem;
  margin: 2rem 0;
}

.meth-formula {
  font-family: var(--mono);
  font-size: clamp(1rem, 2vw, 1.35rem);
  color: #fff;
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}

.f-pop  { color: #4ADE80; font-weight: 600; }
.f-econ { color: #FBBF24; font-weight: 600; }
.f-soc  { color: #60A5FA; font-weight: 600; }
.f-geo  { color: #F87171; font-weight: 600; }

.meth-formula-legend {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.meth-formula-legend div {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.5;
}

.meth-formula-legend span {
  font-family: var(--mono);
  font-weight: 600;
  margin-right: 0.75rem;
  font-size: 0.9rem;
}

/* ── Callout ─────────────────────────────────────────────────────── */
.meth-callout {
  border-left: 3px solid var(--accent);
  padding: 1rem 1.5rem;
  background: rgba(200,75,49,0.05);
  margin: 2rem 0;
  font-size: 0.88rem;
  color: #2D3448;
  line-height: 1.75;
  max-width: 740px;
}

.meth-callout.dark {
  background: var(--ink);
  color: rgba(255,255,255,0.5);
  border-color: rgba(255,255,255,0.1);
}

/* ── Dimensions grid ─────────────────────────────────────────────── */
.meth-dim-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  margin-top: 2rem;
}

.meth-dim-card {
  background: var(--paper2);
  padding: 2rem;
}

.meth-dim-card.pop  { border-top: 3px solid #4ADE80; }
.meth-dim-card.econ { border-top: 3px solid #FBBF24; }
.meth-dim-card.soc  { border-top: 3px solid #60A5FA; }
.meth-dim-card.geo  { border-top: 3px solid #F87171; }

.meth-dim-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.meth-dim-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.meth-dim-weight {
  font-family: var(--serif);
  font-size: 2rem;
  color: var(--border);
}

.meth-dim-card p {
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.meth-dim-card ul {
  padding-left: 1.1rem;
  margin: 0;
}

.meth-dim-card li {
  font-size: 0.85rem;
  color: #2D3448;
  line-height: 1.7;
  margin-bottom: 0.5rem;
}

.meth-dim-note {
  font-size: 0.78rem !important;
  color: var(--muted) !important;
  margin-top: 1rem !important;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-style: italic;
}

/* ── Sources table ───────────────────────────────────────────────── */
.meth-sources-table {
  margin-top: 2rem;
  border: 1px solid var(--border);
}

.meth-source-row {
  display: grid;
  grid-template-columns: 2fr 1.5fr 0.6fr 1.5fr;
  border-bottom: 1px solid var(--border);
  gap: 0;
}

.meth-source-row:last-child { border-bottom: none; }

.meth-source-row.header {
  background: var(--ink);
}

.meth-source-row.header div {
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  padding: 0.75rem 1rem;
  border-right: 1px solid rgba(255,255,255,0.06);
}

.meth-source-row:not(.header) div {
  padding: 0.75rem 1rem;
  font-size: 0.83rem;
  color: #2D3448;
  border-right: 1px solid var(--border);
  line-height: 1.5;
}

.meth-source-row:not(.header):hover { background: rgba(0,0,0,0.02); }
.meth-source-row div:last-child { border-right: none; }

/* ── Model cards ─────────────────────────────────────────────────── */
.meth-model-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  margin: 2rem 0;
}

.meth-model-card {
  background: var(--paper);
  padding: 2rem 1.75rem;
}

.meth-model-name {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.meth-model-name.linear { color: #2563A8; }
.meth-model-name.poly   { color: #C84B31; }
.meth-model-name.exp    { color: #1A6B3C; }

.meth-model-eq {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--ink);
  margin-bottom: 1rem;
  padding: 0.5rem 0.75rem;
  background: var(--paper2);
  border-left: 2px solid var(--border);
}

.meth-model-card p {
  font-size: 0.85rem;
  color: #2D3448;
  line-height: 1.75;
  margin-bottom: 1rem;
}

.meth-model-won {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 0.75rem;
  margin-top: auto;
}

/* ── Version history ─────────────────────────────────────────────── */
.meth-versions {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
}

.meth-version-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  border-bottom: 1px solid var(--border);
}

.meth-version-row:last-child { border-bottom: none; }

.meth-version-row.current {
  background: rgba(200,75,49,0.03);
}

.meth-version-tag {
  font-family: var(--serif);
  font-size: 2rem;
  color: var(--border);
  padding: 1.75rem 1.5rem;
  border-right: 1px solid var(--border);
  display: flex;
  align-items: flex-start;
}

.meth-version-row.current .meth-version-tag {
  color: var(--accent);
}

.meth-version-body {
  padding: 1.75rem 2rem;
}

.meth-version-title {
  font-family: var(--serif);
  font-size: 1.1rem;
  color: var(--ink);
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.meth-current-badge {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--accent);
  color: #fff;
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
}

.meth-version-body p {
  font-size: 0.85rem;
  color: #3D4455;
  line-height: 1.8;
}

/* ── Limitations grid ────────────────────────────────────────────── */
.meth-limits-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  margin: 2rem 0;
}

.meth-limit {
  background: var(--paper2);
  padding: 1.75rem;
}

.meth-limit-title {
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
  margin-bottom: 0.65rem;
}

.meth-limit p {
  font-size: 0.85rem;
  color: #3D4455;
  line-height: 1.8;
  max-width: 100%;
}

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .meth-dim-grid    { grid-template-columns: 1fr; }
  .meth-model-grid  { grid-template-columns: 1fr; }
  .meth-limits-grid { grid-template-columns: 1fr; }
  .meth-source-row  { grid-template-columns: 1fr 1fr; }
  .meth-source-row.header div:nth-child(3),
  .meth-source-row:not(.header) div:nth-child(3) { display: none; }
  .meth-toc a { font-size: 0.6rem; padding: 0.5rem 0.7rem; }
}

@media (max-width: 600px) {
  .meth-version-row  { grid-template-columns: 50px 1fr; }
  .meth-version-tag  { font-size: 1.4rem; padding: 1.25rem 1rem; }
  .meth-source-row   { grid-template-columns: 1fr; }
  .meth-source-row.header div:not(:first-child) { display: none; }
}