body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f6f7fb;
  color: #1f2937;
}

.container {
  max-width: 960px;
  margin: 24px auto;
  background: #fff;
  padding: 20px;
  border-radius: 8px;
}

.narrow {
  max-width: 480px;
}

form {
  display: grid;
  gap: 12px;
}

input, button {
  padding: 8px;
}

button {
  cursor: pointer;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.card {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  border-bottom: 1px solid #e5e7eb;
  text-align: left;
  padding: 8px;
}

.error {
  color: #dc2626;
}