:root {
  --bg: #0e1420;
  --bg-card: #161e2e;
  --bg-card-border: #263148;
  --text: #e8ecf4;
  --text-dim: #9aa7bd;
  --accent: #4da3ff;
  --accent-2: #ff7a59;
  --accent-3: #3ecf8e;
  --accent-4: #f5c542;
  --accent-5: #b78cff;
  --negative: #ff5d6c;
  --positive: #3ecf8e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  padding: 36px 0 12px;
}

.site-header h1 {
  margin: 0 0 6px;
  font-size: 1.9rem;
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.error-banner {
  margin: 16px 0;
  padding: 12px 16px;
  border: 1px solid var(--negative);
  border-radius: 8px;
  background: rgba(255, 93, 108, 0.12);
  color: var(--text);
  font-size: 0.9rem;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin: 24px 0 8px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: 10px;
  padding: 14px 16px;
}

.kpi-card .kpi-name {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kpi-card .kpi-value {
  font-size: 1.45rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.kpi-card .kpi-unit {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-left: 4px;
}

.kpi-card .kpi-delta {
  font-size: 0.78rem;
  margin-top: 2px;
  color: var(--text-dim);
}

.kpi-card .kpi-delta.up {
  color: var(--positive);
}

.kpi-card .kpi-delta.down {
  color: var(--negative);
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 18px 0 40px;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: 10px;
  padding: 16px 16px 8px;
}

.chart-card h2 {
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 600;
}

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

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

.site-footer {
  border-top: 1px solid var(--bg-card-border);
  padding: 20px 0 32px;
  color: var(--text-dim);
  font-size: 0.8rem;
}

.site-footer a {
  color: var(--accent);
}

@media (max-width: 800px) {
  .chart-grid {
    grid-template-columns: 1fr;
  }

  .site-header h1 {
    font-size: 1.5rem;
  }
}