:root {
  --bg-body: #0f0f1a;
  --bg-card: #1a1a2e;
  --bg-section: #16213e;
  --border: #2a2a4a;
  --text-primary: #e0e0e0;
  --text-secondary: #8888aa;
  --accent: #4fc3f7;
  --accent-green: #66bb6a;
  --accent-orange: #ffa726;
  --accent-red: #ef5350;
  --accent-purple: #ab47bc;
  --radius: 8px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 3rem 1rem 1.5rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}

header .subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 0.4rem;
}

/* ── Summary cards ── */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  max-width: 1200px;
  margin: 0 auto 2rem;
  padding: 0 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  text-align: center;
}

.card .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
}

.card .value {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

.card .delta {
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

.card .delta.up { color: var(--accent-green); }
.card .delta.down { color: var(--accent-red); }
.card .delta.neutral { color: var(--text-secondary); }

/* ── Chart sections ── */

.chart-section {
  max-width: 1200px;
  margin: 0 auto 2rem;
  padding: 0 1.5rem;
}

.chart-section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  padding-left: 0.25rem;
  border-left: 3px solid var(--accent);
  padding-left: 0.75rem;
}

.chart {
  background: var(--bg-section);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  height: 340px;
  width: 100%;
}

/* ── Footer ── */

footer {
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

footer strong {
  color: var(--text-primary);
}

footer code {
  background: var(--bg-card);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-size: 0.85em;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

footer p + p {
  margin-top: 0.3rem;
}

/* ── Responsive ── */

@media (max-width: 600px) {
  header { padding: 2rem 1rem 1rem; }
  header h1 { font-size: 1.5rem; }
  .cards { grid-template-columns: repeat(2, 1fr); gap: 0.5rem; padding: 0 0.75rem; }
  .card .value { font-size: 1.2rem; }
  .chart-section { padding: 0 0.75rem; }
  .chart { height: 280px; }
}