:root {
  --bg: #f4f6f8;
  --card-bg: #ffffff;
  --text: #1a1f26;
  --muted: #62707d;
  --accent: #2b7fff;
  --border: #e1e6ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161b;
    --card-bg: #1b2129;
    --text: #eef1f4;
    --muted: #8b98a5;
    --accent: #5b9bff;
    --border: #2a323b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 1.5rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

h1 { margin: 0; font-size: 1.5rem; }

.controls { display: flex; align-items: center; gap: 0.5rem; }

select {
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
}

.status { font-size: 0.85rem; color: var(--muted); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.card .label { font-size: 0.8rem; color: var(--muted); }
.card .value { font-size: 1.6rem; font-weight: 600; color: var(--accent); }

.charts {
  display: grid;
  gap: 1.5rem;
}

.charts canvas {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  max-height: 320px;
}