:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #4b5563;
  --border: #d8e0ea;
  --accent: #4f7ea8;
  --accent-dark: #2f5f8d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.page-header h1 {
  margin: 0 0 10px;
  font-size: 1.8rem;
}

.meta {
  margin: 2px 0;
  color: var(--muted);
}

.description {
  margin: 10px 0 0;
}

.charts-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 16px;
}

.chart-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}

.chart-card h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.chart {
  width: 100%;
  min-height: 320px;
}

.wide {
  grid-column: 1 / -1;
}

.axis-label {
  fill: var(--text);
  font-size: 12px;
}

.tick text {
  font-size: 11px;
}

.bar {
  fill: var(--accent);
}

.dot {
  fill: var(--accent);
  opacity: 0.85;
}

.dot:hover {
  fill: var(--accent-dark);
}

.tooltip {
  position: absolute;
  pointer-events: none;
  background: #111827;
  color: #f9fafb;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.35;
  opacity: 0;
  transition: opacity 0.15s ease;
}

@media (max-width: 680px) {
  .chart {
    min-height: 280px;
  }
}