/* ── Tokens ─────────────────────────────────────────────────── */
:root {
  --bg:      #0c1420;
  --card:    #111d2e;
  --border:  #1e3050;
  --accent:  #d4890a;
  --accent2: #f0c040;
  --text:    #dce3ee;
  --muted:   #7a90aa;
  --display: "Oswald", sans-serif;
  --sans:    "Inter", system-ui, sans-serif;
  --mono:    "IBM Plex Mono", monospace;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a            { color: var(--accent); text-decoration: none; }
a:hover      { color: var(--accent2); text-decoration: underline; }
img          { max-width: 100%; height: auto; display: block; }
p            { margin-bottom: 1rem; }
ul           { padding-left: 1.5rem; }
li           { margin-bottom: 0.35rem; }

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 400; line-height: 1.2; }

h1 { font-size: clamp(2rem, 5vw, 3.2rem); color: var(--text); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem);   color: var(--text); }
h3 { font-size: 1.15rem; color: var(--accent); letter-spacing: 0.04em; }

.section-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
  display: block;
}

/* ── Layout ─────────────────────────────────────────────────── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}
section:last-of-type { border-bottom: none; }

/* ── Navigation ─────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 20, 32, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0.75rem 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-brand {
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--text);
  white-space: nowrap;
}
.nav-links {
  display: flex;
  gap: 1.6rem;
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.18s;
}
.nav-links a:hover { color: var(--accent); text-decoration: none; }

/* ── Hero / Header ───────────────────────────────────────────── */
.hero {
  padding: 6rem 0 5rem;
  border-bottom: 1px solid var(--border);
}
.hero-subtitle {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 640px;
  margin-top: 1.1rem;
}
.hero-meta {
  display: flex;
  gap: 1.8rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.hero-meta-item {
  font-size: 0.82rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.hero-meta-item strong {
  display: block;
  color: var(--text);
  font-size: 0.95rem;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 500;
}

/* ── Divider ─────────────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ── Card ────────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2rem;
}

/* ── Data attributes table ────────────────────────────────────── */
.attr-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 1.4rem;
}
.attr-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.7rem 1rem;
}
.attr-name {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.2rem;
}
.attr-desc {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.4;
}

/* ── References ─────────────────────────────────────────────── */
.ref-list { list-style: none; padding: 0; }
.ref-list li {
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--accent);
  background: var(--card);
  border-radius: 0 6px 6px 0;
  margin-bottom: 1rem;
  font-size: 0.92rem;
  line-height: 1.6;
}
.ref-list .ref-title  { font-weight: 600; color: var(--text); }
.ref-list .ref-author { color: var(--muted); }

/* ── Viz sections ────────────────────────────────────────────── */
.viz-section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}
.viz-header {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}
.viz-number {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15rem 0.55rem;
}
.viz-chart-wrap {
  margin: 2.2rem 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.viz-chart-wrap img {
  width: 100%;
  border-radius: 10px;
}
.viz-caption {
  padding: 1.4rem 1.8rem;
  border-top: 1px solid var(--border);
  background: rgba(30, 48, 80, 0.18);
}
.viz-caption h4 {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.viz-caption p {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.7;
}

/* Interactive chart containers */
.viz-interactive-wrap {
  margin: 2.2rem 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  padding: 1.6rem;
}
.viz-interaction-note {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(212, 137, 10, 0.08);
  border: 1px solid rgba(212, 137, 10, 0.25);
  border-radius: 6px;
  font-size: 0.84rem;
  color: var(--muted);
}
.viz-interaction-note strong { color: var(--accent); }

/* Viz 5 controls override */
#viz5-chart .d3-metric-row { margin-bottom: 1rem; }

/* ── Altair / Vega-Embed overrides ───────────────────────────── */
.vega-embed { width: 100% !important; }
.vega-embed canvas,
.vega-embed svg { max-width: 100% !important; }
.vega-embed .vega-actions { display: none !important; }

/* ── Summary / Conclusions ───────────────────────────────────── */
.conclusion-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1.2rem;
  margin-top: 2rem;
}
.conclusion-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}
.conclusion-card .c-number {
  font-family: "IBM Plex Mono", monospace;
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.6rem;
  display: block;
}
.conclusion-card h4 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.conclusion-card p {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.65;
}

/* ── Footer ──────────────────────────────────────────────────── */
footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
  text-align: center;
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 640px) {
  .container { padding: 0 1.2rem; }
  section, .viz-section { padding: 3.5rem 0; }
  .hero { padding: 4rem 0 3.5rem; }
  .nav-links { gap: 1rem; }
}