body {
  font-family: "Hiragino Sans", "Meiryo", sans-serif;
  background: #f5f5f7;
  margin: 0;
  padding: 40px 16px;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  background: white;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

h1 {
  font-size: 22px;
  margin-bottom: 4px;
}

h2 {
  font-size: 16px;
  margin-top: 28px;
}

.history-item {
  border-bottom: 1px solid #eee;
  padding: 12px 0;
}

.history-meta {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: #888;
}

.history-mode {
  font-weight: bold;
  color: #2d6cdf;
}

.history-original, .history-result {
  margin: 4px 0;
  font-size: 14px;
  white-space: pre-wrap;
}