/* 全体レイアウト */
body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #fdfaf6;
  color: #333;
  padding: 20px;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  align-items: center;
}

main,
.word-list,
footer {
  width: 100%;
  max-width: 800px;
  text-align: left;
}

/* タイトル・見出し */
h1 {
  font-family: 'Georgia', serif;
  font-size: 2em;
  color: #4a4a4a;
}
h2 {
  color: #4a4a4a;
}
li {
  margin-top: 2rem;
}
.example-words {
  margin-top: 1rem;
  display: block;
}

/* セクションごとの info-box */
.info-box {
  width: 100%;
  max-width: 800px;
  padding: 15px;
  margin-bottom: 30px;
  border-radius: 8px;
}

/* 関係代名詞：青系 */
.noun-box {
  background-color: #e2ecf0;
  border-left: 5px solid #6ca0b9;
}

/* 関係副詞：緑系 */
.adverb-box {
  background-color: #e6f4ec;
  border-left: 5px solid #5cbf8e;
}

/* 複合関係詞：紫系 */
.complex-box {
  background-color: #f3eafc;
  border-left: 5px solid #a78bd7;
}

/* ボタン共通 */
.button-group {
  margin-top: 1em;
  margin-bottom: 2em;
  text-align: center;
}
button {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  color: white;
  cursor: pointer;
  font-size: 1em;
}

/* ボタン色分け */
.group-noun button {
  background-color: #5c8ecf;
}
.group-noun button:hover {
  background-color: #3d6fb0;
}
.group-adverb button {
  background-color: #5cbf8e;
}
.group-adverb button:hover {
  background-color: #3d9f6f;
}
.group-complex button {
  background-color: #a78bd7;
}
.group-complex button:hover {
  background-color: #8a6bbd;
}

/* 例文表示エリア */
.word-list {
  background-color: #fff;
  border: 1px solid #ccc;
  padding: 15px;
  border-radius: 5px;
  margin: 0 auto;
  width: 100%;
  max-width: 600px;
  text-align: left;
}
.word-list #example-area {
  width: 100%;
  height: auto;
  padding: 12px;
  box-sizing: border-box;
  margin: 5px auto 5px 5em;
}
.highlight {
  background-color: #fffa9e;
  font-weight: bold;
}
.example {
  display: block;
  margin: 4px 0;
}
.translation {
  font-style: italic;
  color: #555;
}
.translation-item {
  list-style-type: none;
  margin-top: 0;
}

/* 戻るボタン */
.toeic-top {
  margin-top: 5rem;
  text-align: center;
}
.toeic-top a {
  text-decoration: none;
  color: #4a4a4a;
}
.top-button {
  padding: 10px 15px;
  background-color: #87b8cf;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.3s;
}
.top-button:hover {
  background-color: #6ca0b9;
}

/* フッター */
footer {
  margin-top: 40px;
  padding: 20px 15px;
  background-color: #bfdae7;
  text-align: center;
  font-family: 'Yomogi', sans-serif;
  font-size: 0.95em;
  border-top: 1px dashed #ccc;
  color: #444;
}

/* モバイル対応 */
@media screen and (max-width: 480px) {
  *{
    box-sizing: border-box;
  }
  body {
    padding: 10px;
  }
  main,
  .info-box,
  .word-list,
  footer {
    max-width: 100%;
    padding: 12px;
    font-size: 0.95em;
  }
  h1 {
    font-size: 1.4em;
    line-height: 1.3;
  }
  .button-group {
    flex-direction: column;
    align-items: center;
  }
  .group-noun,
  .group-adverb,
  .group-complex {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 100%;
  }
  .group-noun button,
  .group-adverb button,
  .group-complex button{
    width: 100%;
    max-width: 300px;
    font-size: 1em;    
  }
  .word-list #example-area {
    margin-left: 0;
    margin-right: 0;
  }
  .example {
    font-size: 0.9em;
  }
  .highlight {
    padding: 2px 3px;
    font-size: 0.95em;
  }
  footer {
    font-size: 0.85em;
  }
}