:root {
  --color-bg: #f4f5f7;
  --color-surface: #ffffff;
  --color-border: #d9dce1;
  --color-text: #202124;
  --color-text-muted: #5f6368;
  --color-primary: #1a73e8;
  --color-primary-hover: #1558b0;
  --color-danger-text: #444;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

.page-header h1 {
  font-size: 1.4rem;
  margin: 8px 0 4px;
}

.note {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin: 4px 0 0;
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 16px;
  margin-top: 16px;
}

.field-group {
  padding: 16px 0;
}

.field-group + .field-group {
  border-top: 1px solid var(--color-border);
}

.field-group h2 {
  font-size: 1.05rem;
  margin: 0 0 12px;
}

.field-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 12px;
  flex: 1 1 220px;
}

.field span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.field input,
.field select {
  font-size: 1rem;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  width: 100%;
}

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

.summary {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
}

.summary-row + .summary-row {
  border-top: 1px solid var(--color-border);
}

.summary-row dt {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.summary-row dd {
  margin: 0;
  font-weight: 600;
  text-align: right;
}

.checkbox-field {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
}

.checkbox-field input {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.button-row {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

.btn {
  flex: 1;
  padding: 14px 16px;
  font-size: 1rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

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

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-danger-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: #eee;
}

#resultSection pre {
  white-space: pre-wrap;
  word-break: break-all;
  background: #f6f8fa;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px;
  font-size: 0.85rem;
}

.payload-details {
  margin-top: 12px;
  font-size: 0.85rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (min-width: 700px) {
  .page {
    padding-top: 32px;
  }
}