:root {
  --bg: #ffffff;
  --bg-secondary: #f8fafc;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

.controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.controls select {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.9rem;
}

.meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  box-shadow: var(--card-shadow);
}

.card-value {
  font-size: 2rem;
  font-weight: 700;
}

.card-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.card.total .card-value { color: var(--text); }
.card.open .card-value { color: #3b82f6; }
.card.merged .card-value { color: #22c55e; }
.card.closed .card-value { color: #ef4444; }
.card.fsfix .card-value { color: #a855f7; }
.card.human .card-value { color: #f59e0b; }

.charts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.chart-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
}

.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
  font-size: 1.1rem;
}

@media (min-width: 768px) {
  .charts {
    grid-template-columns: 1fr 1fr;
  }

  .chart-container:first-child {
    grid-column: 1 / -1;
  }
}

.detail-section {
  margin-top: 2rem;
}

.detail-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.detail-header label {
  font-weight: 600;
}

.detail-header select {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.9rem;
}

.pr-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

.pr-table th,
.pr-table td {
  padding: 0.6rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.pr-table th {
  background: var(--bg);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.pr-table td {
  font-size: 0.9rem;
}

.pr-table tbody tr:last-child td {
  border-bottom: none;
}

.pr-table tbody tr:hover {
  background: var(--bg);
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge.open { background: rgba(59, 130, 246, 0.15); color: #3b82f6; }
.badge.merged { background: rgba(34, 197, 94, 0.15); color: #22c55e; }
.badge.closed-no-merge { background: rgba(239, 68, 68, 0.15); color: #ef4444; }
.badge.yes { background: rgba(34, 197, 94, 0.15); color: #22c55e; }
.badge.no { background: rgba(148, 163, 184, 0.15); color: var(--text-muted); }