/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #fafaf8;
  --surface: #fff;
  --text: #1a1a1a;
  --text-secondary: #555;
  --text-muted: #888;
  --border: #e0ddd8;
  --border-light: #eee;
  --accent-lex: #2563eb;
  --accent-phon: #dc2626;
  --accent-gap: #f59e0b;
  --accent-cluster: #7c3aed;
  --font-serif: 'Spectral', Georgia, serif;
  --font-mono: 'IBM Plex Mono', 'Menlo', monospace;
  --max-w: 820px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-serif);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

/* === Site Header & Lang Switch === */
.site-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.2rem var(--gutter) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-header .brand {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.site-header .brand:hover {
  color: var(--text);
}

.lang-switch {
  display: flex;
  gap: 0.25rem;
  background: #eceae5;
  padding: 0.2rem;
  border-radius: 6px;
}

.lang-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  text-decoration: none;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.lang-btn.active {
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* === Hero === */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 6rem) var(--gutter) clamp(2rem, 5vw, 4rem);
}

.hero .kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1.2rem;
}

.hero .standfirst {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 640px;
}

.hero .standfirst strong {
  color: var(--text);
  font-weight: 600;
}

.hero .byline {
  margin-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.hero .byline a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* === Sections === */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) var(--gutter);
  border-top: 1px solid var(--border);
}

.section-head {
  margin-bottom: 2rem;
}

.section-head .kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.section-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 3.5vw, 1.8rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 0.6rem;
}

.section-head .context {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.65;
}

.section-head .context em {
  font-style: italic;
}

/* === Charts === */
.chart-container {
  position: relative;
  margin: 1.5rem -0.5rem 0;
}

.chart-container canvas {
  display: block;
  width: 100%;
  height: auto;
}

.chart-legend {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.swatch {
  display: inline-block;
  width: 14px;
  height: 3px;
  border-radius: 2px;
}

.legend-item.lex .swatch { background: var(--accent-lex); }
.legend-item.phon .swatch { background: var(--accent-phon); }

.chart-tooltip {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.5;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  z-index: 10;
  white-space: nowrap;
}

/* === Stats Row === */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1rem 1.2rem;
}

.stat-card .stat-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.stat-card .stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
}

.stat-card .stat-note {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
}

/* === Lookup === */
.lookup-input-wrap {
  max-width: 480px;
}

#nameInput {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  padding: 0.8rem 1rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.15s;
}

#nameInput:focus {
  outline: none;
  border-color: var(--accent-lex);
}

#nameInput::placeholder {
  color: var(--text-muted);
}

.lookup-result {
  margin-top: 1.2rem;
  padding: 1.2rem 1.4rem;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
}

.lookup-result .lookup-code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cluster);
  margin-bottom: 0.3rem;
}

.lookup-result .lookup-stat {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
}

.lookup-result .lookup-stat strong {
  color: var(--text);
}

.lookup-result .lookup-names {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.lookup-result .lookup-names .name-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: #f3f0ff;
  color: var(--accent-cluster);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.lookup-result .lookup-names .name-tag.is-input {
  background: var(--accent-cluster);
  color: #fff;
}

.lookup-not-found {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-style: italic;
}

/* === Cluster Table === */
.cluster-table {
  overflow-x: auto;
}

.cluster-row {
  display: grid;
  grid-template-columns: 72px 1fr 100px 80px;
  gap: 0.8rem;
  align-items: center;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.88rem;
}

.cluster-row:first-child {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border);
}

.cluster-code {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent-cluster);
  font-size: 0.82rem;
}

.cluster-names {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.cluster-names span {
  white-space: nowrap;
}

.cluster-names span:not(:last-child)::after {
  content: ",";
}

.cluster-spark {
  height: 28px;
}

.cluster-count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-align: right;
  color: var(--text-secondary);
}

/* === Method === */
.method-body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.method-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
}

.method-card h3 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.method-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* === Global Convergence Section === */
.global-controls {
  margin-bottom: 1.5rem;
}

.era-selector {
  display: flex;
  gap: 0.5rem;
  background: #eceae5;
  padding: 0.3rem;
  border-radius: 8px;
  width: fit-content;
  max-width: 100%;
}

.era-btn {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.era-btn.active {
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.global-era-summary {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.global-era-summary h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.global-metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.global-metric-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1rem 1.2rem;
}

.global-metric-card .stat-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.global-metric-card .stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.2;
}

.global-metric-card .stat-note {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
}

.country-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.country-column {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.2rem;
}

.country-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--border);
}

.country-name {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.country-agency {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
}

.country-subhead {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0.8rem 0 0.4rem;
}

.country-name-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.country-name-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: #f4f3f0;
  color: var(--text-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.country-name-tag.is-shared {
  background: #ede9fe;
  color: var(--accent-cluster);
  font-weight: 600;
}

.corridors-block {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.5rem;
  margin-top: 1rem;
}

.corridors-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.corridor-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.2rem 0 1.5rem;
}

.corridor-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 20px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.corridor-pill:hover {
  border-color: var(--accent-cluster);
  color: var(--text);
}

.corridor-pill.active {
  background: var(--accent-cluster);
  border-color: var(--accent-cluster);
  color: #fff;
  font-weight: 600;
}

.corridor-detail {
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
}

.corridor-detail-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.corridor-detail-name {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
}

.corridor-detail-phoneme {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cluster);
  background: #f3f0ff;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.corridor-detail-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.2rem;
}

.corridor-triad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  background: var(--bg);
  padding: 1rem;
  border-radius: 6px;
}

.corridor-triad-col h4 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.corridor-triad-col .names {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text);
  line-height: 1.5;
}

/* === Footer === */
.colophon {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem var(--gutter) 3rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
}

.colophon a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* === Responsive === */
@media (max-width: 750px) {
  .country-grid {
    grid-template-columns: 1fr;
  }
  .corridor-triad {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .cluster-row {
    grid-template-columns: 60px 1fr 80px;
  }
  .cluster-count { display: none; }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .global-metrics-row { grid-template-columns: 1fr 1fr; }
}