body {
  font-family: sans-serif;
  padding-bottom: 60px;
  margin: 0;
  padding-top: 10px;
}

.page {
  display: none;
}
.page.active {
  display: block;
}

#anchor-ad {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 50px;
  background-color: #eee;
  text-align: center;
  line-height: 50px;
  z-index: 100;
  border-top: 1px solid #ccc;
}

.ad-banner {
  margin: 20px 0;
  padding: 20px;
  background-color: #f8f8f8;
  border: 1px solid #ccc;
  text-align: center;
}

/* 進捗バーの画面上部固定化 */
#quiz-progress-container {
  position: sticky;
  top: 0;
  background-color: #ffffff;
  padding: 15px 0 10px 0;
  margin-bottom: 15px;
  border-bottom: 2px solid #ddd;
  z-index: 50;
  box-shadow: 0 4px 6px -6px #222;
}

.unanswered-highlight {
  border: 2px solid #ff4d4d !important;
  background-color: #ffe6e6;
  border-radius: 8px;
  padding: 10px;
  transition: all 0.3s;
}