/* === 全体設定 === */
body {
  font-size: 18px;
  line-height: 1.6;
  font-family: "Rounded M+ 1c", sans-serif;
  line-height: 1.8;
  padding: 1em;
  margin: 0 auto;
  max-width: 600px;
  background-color: #fff;
  color: #3aa100;
}

/* === ヘッダー === */
header {
  text-align: center;
  margin-bottom: 2em;
}

/* === 見出しスタイル === */
h1 {
  font-size: 1.8em;
  font-weight: bold;
  color: #3aa100;
  border-bottom: 3px solid #3aa100;
  padding-bottom: 0.5em;
}

h2 {
  font-size: 1.4em;
  color: #3aa100;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  border-left: 6px solid #3aa100;
  padding-left: 0.6em;
  background-color: #fff3e0;
}

h3 {
  font-size: 1.2em;
  color: #3aa100;
  margin-top: 1.2em;
  margin-bottom: 0.3em;
  border-left: 4px solid #3aa100;
  padding-left: 0.6em;
  background-color: #e3f2fd;
}

/* === 画像 === */
img {
  max-width: 100%;
  height: auto;
  margin-top: 1em;
  margin-bottom: 0.5em;
}

/* === フッター === */
footer {
  margin-top: 2em;
  padding: 1em 0 3em;
  text-align: center;
  background-color: #f9f9f9;
  font-size: 0.9em;
}
footer .chapter-nav {
  font-size: 0.85em; /* または 14px などでもOK */
  text-align: center;
  margin-bottom: 12px;
  margin-bottom: 0.5em;
  line-height: 1.8; /* ← ここを追加！ */

}

footer .chapter-nav a {
  color: #fff;
  text-decoration: none;
  white-space: nowrap;
  background-color: #3aa100;
  /*margin: 0 0.3em;*/
  padding: 0.3em 0.6em;
  text-decoration: none;
  border-radius: 0.5em;
  transition: background-color 0.3s;
  display: inline-block; /* 安定表示 */
  margin: 4px 6px;        /* ← 縦方向にも少し余白を追加 */
}

footer .nav-links {
  margin-bottom: 3em;
}

footer .nav-links a:hover {
  background-color: #ef6c00;
}
footer .chapter-nav a:hover {
  background-color: #e0f0ff;
  text-decoration: underline;
}

footer .chapter-nav a.active {
  background-color: #0077cc;
  color: #fff;
  font-weight: bold;
}

/* === クイズ・選択ボタン系 === */
.quiz-section button,
.interest-section button {
  margin: 0.3em;
  padding: 0.5em 1em;
  font-size: 1em;
  border: none;
  border-radius: 0.5em;
  background-color: #f57c00;
  color: #fff;
  cursor: pointer;
  transition: background-color 0.3s;
}

.quiz-section button:hover,
.interest-section button:hover {
  background-color: #ef6c00;
}

.result {
  font-weight: bold;
  margin-top: 0.5em;
}


.quiz-answer {
  margin-top: 1em;
  font-weight: bold;
  color: #f57c00;
}

.quiz-answer {
  margin-top: 1em;
  font-weight: bold;
  font-size: 1.1em;
}

.quiz-answer.correct {
  color: green;
}

.quiz-answer.incorrect {
  color: red;
}

.box {
  font-size: 18px; !important;
  border: 2px solid #3aa100;
  background-color: #fff8e7;
  padding: 20px;
  border-radius: 12px;
  margin: 30px 0;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.box h2 {
  font-size: 1.4em;
  margin-bottom: 1em;
  color: #3aa100;
}
section.box > h2 {
  font-size: 1.2em;
  color: #3aa100;
  border-left: 6px solid #3aa100;
  padding-left: 12px;
  margin-bottom: 1em;
  margin-top: 0;
  font-weight: bold;
  background-color: transparent;
}

.quiz-box {
  border: 2px solid #ddd;
  border-radius: 12px;
  padding: 16px;
  margin: 20px auto;
  max-width: 500px;
  background: #f9f9f9;
  text-align: center;
  box-shadow: 2px 2px 8px rgba(0,0,0,0.05);
}

.quiz-question {
  font-size: 18px;
  margin-bottom: 12px;
}

.quiz-buttons button {
  font-size: 16px;
  padding: 8px 20px;
  margin: 6px;
  border-radius: 8px;
  border: none;
  background-color: #eee;
  cursor: pointer;
  transition: background 0.2s;
}

.quiz-buttons button:hover {
  background-color: #ddd;
}

.result {
  font-size: 16px;
  font-weight: bold;
  margin-top: 10px;
}



.chapter-card {
  background-color: #f9f9ff;
  border: 1px solid #3aa100;
  border-radius: 12px;
  padding: 16px;
  margin: 16px auto;
  max-width: 600px;
  box-shadow: 2px 2px 6px rgba(0,0,0,0.05);
  transition: background-color 0.3s;
}

.chapter-card:hover {
  background-color: #eef3ff;
}

.chapter-card h3 {
  font-size: 16px;
  font-weight: bold;
  color: #3aa100;
  margin-bottom: 6px;
  background-color: transparent;
  border-left: none;
  padding-left: 0;
}


.chapter-card p {
  font-size: 15px;
  margin: 0;
  color: #3aa100;
}

.btn {
  display: block;
  text-decoration: none;
  padding: 12px 16px;
  border-radius: 8px;
  font-weight: bold;
  text-align: center;
  margin: 16px auto;
  max-width: 320px;
  width: 90%;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  box-sizing: border-box;
  color: #fff;
}

.btn-green {
  background-color: #3aa100;
}

.btn-green:hover {
  background-color: #2a7b00;
}

.btn-orange {
  background-color: #f6a13c;
}

.btn-orange:hover {
  background-color: #e3841e;
}

textarea {
  width: 100%;
  box-sizing: border-box; /* ← これが重要！ */
  font-size: 18px;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  resize: vertical;
}