:root {
  --primary-color: oklch(54.6% 0.245 262.881);
  --secondary-color: oklch(93.2% 0.032 255.585);
  --gray-200-color: oklch(92.8% 0.006 264.531);
  --gray-400-color: oklch(70.7% 0.022 261.325);
  --gray-600-color: oklch(44.6% 0.03 256.802);
  --white-color: oklch(100% 0 0);
  --warning-color: oklch(57.7% 0.245 27.325);
}
body {
  background-color: var(--gray-200-color);
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

header {
}

main {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

section {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--white-color);
  padding: 1rem 2rem;
  border-radius: 4px;
}

.col-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  border: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group-title {
  display: flex;
  gap: 4px;
}

.form-group:has(input[required]:invalid) .form-group-title::after {
  content: "*必須";
  color: var(--warning-color);
}

input[type="text"],
input[type="tel"],
input[type="email"] {
  width: 100%;
  box-sizing: border-box;
  font-size: 1rem;
  padding: 8px 4px;
  border-top: none;
  border-right: none;
  border-left: none;
  border-bottom: 1px solid var(--gray-400-color);
}

input[type="text"]:focus,
input[type="tel"]:focus,
input[type="email"]:focus {
  outline: none;
  border-bottom: 1px solid var(--primary-color);
}

fieldset {
  border: 1px solid var(--gray-400-color);
  display: flex;
  flex-direction: column;
}

label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 4px 0;
}

label:hover {
  background-color: var(--secondary-color);
}

input[type="checkbox"] {
  border: 2px solid var(--gray-400-color);
  border-radius: 4px;
  width: 1rem;
  height: 1rem;
  accent-color: var(--primary-color);
}

.form-actions {
  display: flex;
  justify-content: center;
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
}

.btn-send {
  color: var(--primary-color);
  background-color: var(--secondary-color);
}