/* Contagion Model */

:root {
  --primary: #0c4a6e;
  --surface: #ffffff;
  --radius-lg: 12px;
  --radius-md: 8px;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #e1f5fe 0%, #b3e5fc 100%);
  min-height: 100vh;
  color: #0c4a6e;
}

.app-container { max-width: 600px; margin: 0 auto; padding: 20px; }
header { text-align: center; margin-bottom: 32px; }
header h1 { font-size: 2rem; }

.controls { display: grid; gap: 16px; background: #fff; padding: 20px; border-radius: 12px; margin-bottom: 24px; }
.control-group { display: flex; flex-direction: column; gap: 8px; }
.control-group label { font-weight: 500; }

.results { background: #fff; padding: 20px; border-radius: 12px; margin-bottom: 24px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stat-card { text-align: center; padding: 12px; background: #f0fdf4; border-radius: 8px; }
.stat-value { font-size: 1.5rem; font-weight: bold; color: #0c4a6e; }
.stat-label { font-size: 0.75rem; color: #64748b; }

.visualization { background: #fff; padding: 20px; border-radius: 12px; }
.visualization h2 { margin-bottom: 16px; color: #0c4a6e; }