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

.container {
  max-width: 960px;
  margin: 48px auto;
  padding: 24px;
}

.card {
  background: white;
  border-radius: 16px;
  padding: 32px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.subtitle {
  margin-bottom: 24px;
  color: #4b5563;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
}

input,
select {
  padding: 12px;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  font: inherit;
  background: white;
  color: #1f2937;
  width: 100%;
  box-sizing: border-box;
}

select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  cursor: pointer;
}

.actions {
  margin-top: 24px;
}

button {
  padding: 12px 18px;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}

.result {
  margin-top: 32px;
  padding: 20px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #fafafa;
}

.hidden {
  display: none;
}