/* 全体 */
body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f5f6fa;
  color: #333;
}

/* コンテナ */
.container {
  max-width: 800px;
  margin: 40px auto;
  padding: 20px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* ヘッダー */
header {
  background-color: #2f3640;
  color: white;
  padding: 15px;
  text-align: center;
}

/* フッター */
footer {
  background-color: #2f3640;
  color: white;
  text-align: center;
  padding: 10px;
  margin-top: 40px;
}

/* ボタン */
button {
  padding: 10px 16px;
  margin: 5px 5px 0 0;
  border: none;
  border-radius: 6px;
  background-color: #40739e;
  color: white;
  cursor: pointer;
}

button:hover {
  background-color: #273c75;
}

/* 選択肢 */
label {
  display: block;
  padding: 10px;
  margin: 5px 0;
  border-radius: 6px;
  background-color: #f1f2f6;
  cursor: pointer;
}

label:hover {
  background-color: #dcdde1;
}

/* サイドバーレイアウト */
.page-wrap {
  display: flex;
  align-items: flex-start;
}

.sidebar-nav {
  width: 148px;
  min-width: 148px;
  flex-shrink: 0;
  background: #2a3042;
  min-height: calc(100vh - 90px);
  padding: 18px 10px;
}

.sidebar-nav .sidebar-title {
  font-size: 0.7rem;
  color: #666;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0 4px;
  margin-bottom: 10px;
}

.cat-select {
  width: 100%;
  padding: 8px 6px;
  background: #0f3460;
  border: 1px solid #1e3a6e;
  border-radius: 6px;
  color: #fff;
  font-size: 0.88rem;
  cursor: pointer;
  appearance: auto;
}

.cat-select:focus {
  outline: none;
  border-color: #7ec8e3;
}

.cat-select option {
  background: #16213e;
  color: #fff;
}

.page-wrap.has-sidebar .container {
  flex: 1;
  margin: 40px 24px;
  max-width: 800px;
}

/* 正解・不正解 */
.correct {
  background-color: #c8f7c5;
}

.incorrect {
  background-color: #f7c5c5;
}