:root {
  --color-text: #333;
  --color-sub: #777;
  --color-error: #c0392b;
  --color-accent: #06c755;
  --color-border: #ddd;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  color: var(--color-text);
  line-height: 1.7;
  background: #fafafa;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

.title {
  font-size: 20px;
  margin: 0 0 12px;
}

.lead {
  font-size: 14px;
  color: var(--color-sub);
  margin: 0 0 24px;
}

.notice {
  padding: 16px;
  text-align: center;
  color: var(--color-sub);
  font-size: 14px;
}

.field {
  margin-bottom: 20px;
}

label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.required {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 6px;
  font-size: 11px;
  font-weight: 400;
  color: #fff;
  background: var(--color-error);
  border-radius: 2px;
  vertical-align: middle;
}

input,
select {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #fff;
}

input:focus,
select:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: -1px;
}

.choice {
  margin: 0 0 20px;
  padding: 0;
  border: none;
}

.choice legend {
  padding: 0;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.choice-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
  padding: 12px;
  font-weight: 400;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: #fff;
}

.choice-option:has(input:checked) {
  border-color: var(--color-accent);
  outline: 1px solid var(--color-accent);
}

.choice-option:has(input:disabled) {
  color: var(--color-sub);
  background: #f2f2f2;
}

.choice-option input {
  width: auto;
  margin: 4px 0 0;
  padding: 0;
  accent-color: var(--color-accent);
}

.choice-option strong {
  display: block;
  font-size: 15px;
}

.choice-note {
  display: block;
  font-size: 12px;
  color: var(--color-sub);
}

.hint {
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--color-sub);
}

.error {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--color-error);
}

.form-error {
  margin-top: 12px;
  text-align: center;
}

.submit {
  width: 100%;
  padding: 16px;
  margin-top: 8px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.submit:disabled {
  background: #b5b5b5;
  cursor: default;
}

.complete {
  text-align: center;
  padding: 24px 0;
}

.complete h2 {
  font-size: 18px;
  margin: 0 0 16px;
}

.complete-slot {
  font-weight: 600;
}

.add-friend {
  display: inline-block;
  margin-top: 16px;
  padding: 14px 24px;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border-radius: 6px;
  text-decoration: none;
}