body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  color: #1f2937;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

header h1 {
  margin-bottom: 8px;
}

nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

nav a {
  text-decoration: none;
  color: #1d4ed8;
}

.card {
  background: #ffffff;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.warning {
  border-color: #f59e0b;
}

.success {
  border-color: #16a34a;
}

.muted {
  color: #6b7280;
}

.actions {
  margin-top: 12px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button,
button {
  display: inline-block;
  border: 1px solid #2563eb;
  background: #2563eb;
  color: #ffffff;
  text-decoration: none;
  border-radius: 6px;
  padding: 10px 14px;
  cursor: pointer;
}

.button.secondary {
  background: #ffffff;
  color: #2563eb;
}

select,
input {
  width: 100%;
  padding: 10px;
  margin: 8px 0 12px 0;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  box-sizing: border-box;
}

.alerts {
  margin-bottom: 16px;
}

.alert {
  border-radius: 6px;
  padding: 10px;
  margin-bottom: 8px;
}

.alert.error {
  background: #fee2e2;
  border: 1px solid #ef4444;
}

.alert.success {
  background: #dcfce7;
  border: 1px solid #22c55e;
}