/* --- core.css --- */
/* ちがくナビ・ちりナビ・公民ナビ 共通基本スタイル */

@import url('https://fonts.googleapis.com/css2?family=M+PLUS+Rounded+1c:wght@400;700;800&display=swap');

:root {
  /* デフォルトカラー（上書き推奨） */
  --primary-color: #00796b;
  --primary-dark: #004d40;
  --background-light: #f0f4f8;
  --background-main: #ffffff;
  --text-color: #333333;
  --header-text-color: #ffffff;
  --font-family-main: 'M PLUS Rounded 1c', sans-serif;
  --max-width-main: 1000px;
  --border-radius-main: 16px;
}

/* --- 基本設定 --- */
body {
  font-family: var(--font-family-main);
  margin: 0;
  padding: 0;
  background-color: var(--background-light);
  color: var(--text-color);
  line-height: 1.6;
}

/* --- ヘッダー --- */
header {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: var(--header-text-color);
  padding: 2rem 1rem;
  text-align: center;
}
header h1 {
  font-weight: 800;
  margin: 0;
  font-size: 2.5rem;
}
header p {
  margin-top: 0.5rem;
  opacity: 0.9;
}

/* --- ナビゲーション --- */
nav {
  background-color: var(--primary-dark);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  padding: 0.5rem 0;
}
nav a {
  color: var(--header-text-color);
  padding: 0.8rem 1.5rem;
  text-decoration: none;
  transition: background 0.3s;
  font-weight: 700;
}
nav a:hover, nav a.active {
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

/* --- パンくずリスト (v4.0) --- */
.breadcrumb-container {
  background-color: rgba(0, 0, 0, 0.05); /* 少し暗くして区別 */
  border-bottom: 1px solid rgba(0,0,0,0.1);
  padding: 0.5rem 0;
}
.breadcrumb {
  max-width: var(--max-width-main);
  margin: 0 auto;
  padding: 0 1.5rem;
  list-style: none;
  font-size: 0.9rem;
}
.breadcrumb li { display: inline; }
.breadcrumb li:not(:last-child)::after {
  content: '>';
  margin: 0 0.8em;
  color: #666;
}
.breadcrumb a {
  color: var(--primary-dark);
  text-decoration: none;
}
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb li.current {
  color: #666;
  font-weight: 700;
}

/* --- メインコンテンツ --- */
main {
  max-width: var(--max-width-main);
  margin: 2.5rem auto;
  padding: 2rem 3rem;
  background-color: var(--background-main);
  border-radius: var(--border-radius-main);
  box-shadow: 0 8px 40px rgba(0,0,0,0.08);
}

main h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-dark);
  border-bottom: 3px solid var(--primary-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5em;
}

main h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary-dark);
  border-left: 8px solid var(--primary-color);
  padding-left: 1rem;
  margin-top: 3em;
  margin-bottom: 1.5em;
}

main h3 {
  font-size: 1.4rem;
  color: var(--primary-dark);
  margin-top: 2em;
  border-bottom: 1px dashed var(--primary-color);
}

/* --- キャラクターボックス --- */
.character-box {
  margin: 2.5em 0;
  border-radius: var(--border-radius-main);
  background: #fff;
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
  overflow: hidden;
  border: 1px solid #eee;
}

.character-dialog-header {
  display: flex;
  align-items: center;
  gap: 1em;
  padding: 1em 1.5em;
  border-bottom: 1px solid #eee;
}

.character-icon {
  width: 60px;
  height: auto;
  flex-shrink: 0;
}

.character-name {
  font-weight: 700;
  font-size: 1.2em;
}

.character-dialog-body {
  padding: 1.5em;
  line-height: 1.8;
}
.character-dialog-body p:last-child { margin-bottom: 0; }

/* --- その他要素 --- */
footer {
  background-color: var(--primary-dark);
  color: var(--header-text-color);
  text-align: center;
  padding: 2rem;
  margin-top: 4rem;
}
footer a { color: rgba(255,255,255,0.8); }

/* =============================================== */
/* --- 単元一覧カード (Unit Card) --- */
/* =============================================== */

.unit-card-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 3rem;
}

a.unit-card {
  display: block;
  text-decoration: none;
  background-color: #ffffff;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  border: 1px solid rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
  height: 100%; /* 高さを揃える */
}

a.unit-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  border-color: var(--primary-color);
}

.unit-card-header {
  padding: 1.2rem;
  border-bottom: 1px solid #f0f0f0;
  display: flex;
  align-items: center;
  gap: 1rem;
  background-color: rgba(0,0,0,0.02);
}

.unit-card-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background-color: var(--primary-color);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.1rem;
  font-weight: 800;
}

.unit-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-color);
  line-height: 1.4;
}

.unit-card-body {
  padding: 1.2rem;
  font-size: 0.95rem;
  color: #666;
  line-height: 1.6;
}

/* --- レスポンシブ対応 --- */
@media (max-width: 768px) {
  header h1 { font-size: 2rem; }
  main { margin: 1rem; padding: 1.5rem; }
  main h1 { font-size: 1.8rem; }
  main h2 { font-size: 1.5rem; }
  .character-dialog-header { padding: 0.8em; }
  .character-icon { width: 50px; }
  nav a { padding: 0.8rem 1rem; font-size: 0.9rem; }
}