body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fb;
  color: #1f2937;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.5rem;
}

h1 {
  margin-bottom: 0.25rem;
}

.subtitle {
  margin-top: 0;
  color: #4b5563;
}

form {
  background: #fff;
  border: 1px solid #dbe2ea;
  border-radius: 8px;
  padding: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
  gap: 0.35rem;
}

input,
select,
button {
  padding: 0.5rem;
  border: 1px solid #c6cfda;
  border-radius: 6px;
  font-size: 0.95rem;
}

button {
  margin-top: 1rem;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
  border: none;
}

.status {
  margin: 1rem 0;
  min-height: 2.2rem;
}

.error {
  color: #b91c1c;
}

.chart-card {
  background: #fff;
  border: 1px solid #dbe2ea;
  border-radius: 8px;
  padding: 0.75rem;
  height: 420px;
}