:root {
  --primary: #1e90ff;
  --gray-100: #f7fafc;
  --gray-300: #e2e8f0;
  --gray-500: #a0aec0;
  --radius: 8px;
  --font-family: 'Inter', 'Noto Sans JP', sans-serif;
}
* { box-sizing: border-box; }
body {
  font-family: var(--font-family);
  background: var(--gray-100);
  padding: 24px;
}
form {
  background: #fff;
  max-width: 640px;
  margin: 0 auto;
  border-radius: var(--radius);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.field label {
  font-size: 14px;
  color: var(--gray-500);
}
.field input,
.field select,
.field textarea {
  font-size: 15px;
  padding: 10px 12px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
}
.button {
  padding: 14px 16px;
  background: var(--primary);
  color: #fff;
  text-align: center;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  cursor: pointer;
}
.button-secondary {
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.field-row {
  display: flex;
  gap: 12px;
}
.field-row > .field {
  flex: 1;
}
.total-cost {
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  background-color: #f0f4ff;
  padding: 12px;
  border-radius: var(--radius);
  color: #1e3a8a;
}
.return-date {
  font-size: 16px;
  font-weight: 600;
  color: #1e3a8a;
  background-color: #eaf2ff;
  padding: 10px;
  border-radius: var(--radius);
  margin-top: 4px;
  text-align: center;
}