body {
  margin: 0;
  margin-top: 100px;
  font-family: "Noto Sans JP", sans-serif;
  background: #fdfdfd;
  color: #333;
  transition: background 0.3s, color 0.3s;
}
body.dark { background: #111; color: #eee; }
body.dark header, body.dark footer { background: #000; }
body.dark .exam-card { background: #222; color: #eee; border-color: #444; }
/* ダークモード強化 */
/* セクション見出し */
body.dark h3 {
  color: #eee;  /* 明るい文字色に */
}

/* カード内タイトル */
body.dark h4 {
  color: #eee; /* やや明るいグリーンに（サイトのアクセントカラーに合わせて調整可） */
}

body.dark nav a { color: #eee; }
body.dark nav a:hover { color: #9acd32; }

body.dark .search-box input {
  background: #222; color: #eee; border: 1px solid #444;
}
body.dark .search-results {
  background: #222; border: 1px solid #444;
}
body.dark .search-results li { color: #eee; }
body.dark .search-results li:hover { background: #333; }

body.dark .hero {
  background: linear-gradient(270deg, #000, #111, #333);
  color: #eee;
}
body.dark .hero a { background: #4C9207; color: #fff; }
body.dark .hero a:hover { background: #fff; color: #4C9207; }

body.dark .cat-nav { background: #111; }
body.dark .cat-nav a {
  background: #222; color: #eee;
}
body.dark .cat-nav a:hover,
body.dark .cat-nav a.active {
  background: #4C9207; color: #fff;
}

body.dark .breadcrumb {
  background: #111; color: #aaa;
}
body.dark .breadcrumb a { color: #eee; }

body.dark .exam-card:hover {
  background: #333;
  box-shadow: 0 10px 20px rgba(255,255,255,0.1);
}

body.dark footer nav a:hover {
  color: #9acd32;
}

body.dark .modal-content {
  background: #222; color: #eee;
}


/* ヘッダー */
header {
  position: fixed; top: 0; left: 0; width: 100%;
  background: #1c2c4c; color: white;
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.8rem 1.5rem; z-index: 100;
  box-sizing: border-box;
}
header h1 { margin: 0; font-size: 1.2rem; text-align: left; }

/* PC版のナビゲーション配置 */
.nav-container {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

nav { display: flex; align-items: center; gap: 1.2rem; }
nav a { color: white; text-decoration: none; font-size: 0.95rem; transition: 0.3s; }
nav a:hover { color: #4C9207; }
.theme-toggle { cursor: pointer; font-size: 1.2rem; }

/* 検索 */
.search-box {
  position: relative;
  flex-shrink: 0;
  width: 200px;
}
.search-box input {
  border-radius: 20px;
  border: 1px solid #ccc;
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
  width: 100%;
  box-sizing: border-box;
}
.search-results {
  display: none; position: absolute; top: 110%; left: 0;
  background: #fff; border: 1px solid #ddd; width: 100%;
  border-radius: 5px; box-shadow: 0 3px 6px rgba(0,0,0,0.1);
  z-index: 200;
}
.search-results.active { display: block; }
.search-results li { 
  padding: 0.5rem; font-size: 0.85rem; cursor: pointer; 
  list-style: none;
  color: #333;
}
.search-results li:hover { background: #f2f2f2; }

.search-results ul {
  margin: 0;
  padding: 0;
}

/* Hero */
.hero {
  padding: 2.5rem 1rem; text-align: center;
  color: #fff;
  background: linear-gradient(270deg, #1c2c4c, #2e4b7d, #22bb88);
  background-size: 600% 600%;
  animation: gradientMove 12s ease infinite;
}
@keyframes gradientMove {
  0%{background-position:0% 50%}
  50%{background-position:100% 50%}
  100%{background-position:0% 50%}
}
.hero h2 { font-size: 1.5rem; margin-top: -0.5rem; margin-bottom: 1rem; }
.hero p { margin-bottom: 1.5rem; }
.hero a {
  background: #4C9207; color: #fff; padding: 0.8rem 2rem;
  border-radius: 5px; text-decoration: none; font-weight: bold;
}
.hero a:hover { background: #fff; color: #4C9207; }

/* カテゴリーナビ */
.cat-nav {
  background: #f5f5f5; overflow-x: auto; white-space: nowrap;
  padding: 0.5rem 1rem;
}
.cat-nav a {
  display: inline-block; padding: 0.6rem 1.2rem;
  border-radius: 30px; background: #eee;
  margin: 0 0.3rem; font-weight: bold; color: #1c2c4c;
  text-decoration: none; transition: 0.3s;
}
.cat-nav a:hover, .cat-nav a.active { background: #4C9207; color: #fff; }

/* パンくず */
.breadcrumb {
  padding: 0.8rem 1rem; font-size: 0.85rem;
  max-width: 1080px; margin: auto;
}
.breadcrumb a { text-decoration: none; color: #1c2c4c; }
.breadcrumb span { margin: 0 0.5rem; }

/* 試験一覧 */
main { max-width: 1080px; margin: 2rem auto; padding: 0 1rem; }
h3 { text-align: center; margin-bottom: 2rem; color: #1c2c4c; }
.exam-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.exam-card {
  border: 1px solid #ddd; border-radius: 10px;
  padding: 1.5rem; text-align: center; background: #fff;
  transition: 0.3s; opacity: 0; transform: translateY(20px);
}
.exam-card.visible {
  opacity: 1; transform: translateY(0);
}
.exam-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}
.exam-card h4 { color: #2e4b7d; }

/* カードをリンク化した場合の文字装飾リセット */
a.exam-card {
  text-decoration: none;
  color: inherit;
  display: block; /* divと同じ挙動にする */
}

/* ページトップ */
#pagetop {
  position: fixed; bottom: 2rem; right: 2rem;
  background: #1c2c4c; color: #fff;
  border-radius: 50%; width: 50px; height: 50px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; display: none;
}
#pagetop:hover { background: #4C9207; }

/* フッター */
footer {
  background: #1c2c4c; color: #eee; text-align: center;
  padding: 2rem 1rem; font-size: 0.9rem; margin-top: 3rem;
}
footer nav { margin-bottom: 1rem; }
footer nav a { color: #eee; margin: 0 0.8rem; text-decoration: none; }
footer nav a:hover { color: #4C9207; }

/* モーダル */
.modal {
  display: none; position: fixed; top: 0; left: 0;
  width: 100%; height: 100%; background: rgba(0,0,0,0.5);
  align-items: center; justify-content: center; z-index: 500;
}
.modal-content {
  background: #fff; padding: 2rem; border-radius: 10px;
  max-width: 500px; width: 90%; text-align: center;
}
.close-btn { cursor: pointer; color: #1c2c4c; font-weight: bold; }

/* スマホ用調整 */
.menu-btn, .side-nav { display: none; }

@media screen and (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: stretch;
    padding: 0.8rem 1rem;
    gap: 0.0rem;
  }
  
  header h1 {
    text-align: left;
    margin: 0;
  }
  
  /* スマホ版のナビゲーション部分を横並びに配置 */
  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.8rem;
  }
  
  nav {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.8rem;
    flex: 1;
  }
  
  nav a {
    font-size: 0.8rem;
    white-space: nowrap;
  }
  
  /* 検索ボックスを適切なサイズに調整 */
  .search-box {
    width: 140px;
    min-width: 120px;
    flex-shrink: 0;
  }
  
  .search-box input {
    font-size: 0.8rem;
    padding: 0.3rem 0.8rem;
  }
  
  .theme-toggle {
    font-size: 1rem;
    flex-shrink: 0;
  }

  .hero {
    margin-top: -12px;
    padding: 2rem 0.8rem;
  }
  
  /* カードのグリッド調整 */
  .exam-list {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .exam-card {
    padding: 1rem;
  }
}

@media screen and (max-width: 480px) {
  header {
    padding: 0.6rem 0.8rem;
  }
  
  nav a {
    font-size: 0.75rem;
  }
  
  .search-box {
    width: 100px;
    min-width: 80px;
  }
  
  .search-box input {
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
  }
   
  .hero h2 {
    font-size: 1.3rem;
  }
  
  .hero p {
    font-size: 0.9rem;
  }
}

/* ロゴ表示 */
/* デフォルト（PC版） */
.site-logo-img {
  height: 72px;
}
/* タブレット以下 */
@media screen and (max-width: 768px) {
  .site-logo-img {
    height: 40px; /* スマホで少し小さく */
  }
}
/* 小さいスマホ */
@media screen and (max-width: 480px) {
  .site-logo-img {
    height: 38px; /* さらに小さく */
  }
}