/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  background-color: #f0f0f0;
  color: #333;
}

/* 背景 */
#bgFrame {
  min-height: 100vh;
  padding: 30px;
  background: linear-gradient(135deg, #6699FF, #66CC66);
  background-size: 200% 200%;
  animation: gradientShift 15s ease infinite;
}
@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ヘッダー */
#pageHeader {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 2px solid rgba(255,255,255,0.6);
  margin-bottom: 30px;
}
#logo img {
  max-width: 250px;
  transition: transform 0.3s ease;
}
#logo img:hover {
  transform: rotate(5deg) scale(1.05);
}
#logo_caption {
  font-size: 1.2em;
  color: #fff;
  margin-top: 10px;
  text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
}

/* ナビゲーション */
nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  margin-top: 15px;
}
nav ul li {
  margin: 0 15px;
}
nav ul li a {
  text-decoration: none;
  color: #fff;
  font-size: 1.1em;
  padding: 8px 15px;
  transition: background 0.3s, border 0.3s;
  border-radius: 5px;
}
nav ul li a:hover {
  background-color: rgba(255,255,255,0.2);
  border: 1px solid #66CC66;
}

/* メインコンテンツ */
#content {
  max-width: 960px;
  margin: 0 auto;
  background-color: rgba(255,255,255,0.95);
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

/* セクションヘッダー */
.section_header {
  text-align: center;
  margin-bottom: 20px;
}
.section-title {
  font-size: 2.2em;
  color: #6699FF;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 5px;
  position: relative;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -10px;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: #66CC66;
}

/* お仕事セクション */
.works {
  margin-bottom: 40px;
}
.works .year-group {
  margin-bottom: 20px;
}
.works .year-group h3 {
  font-size: 1.8em;
  color: #6699FF;
  margin-bottom: 10px;
  border-bottom: 1px solid #66CC66;
  padding-bottom: 5px;
}
.works .year-group ul {
  list-style: none;
  padding-left: 0;
}
.works .year-group li {
  font-size: 1em;
  margin-bottom: 5px;
}

/* 同人誌セクション */
.doujinshi {
  margin-bottom: 40px;
}
.subsection-title {
  font-size: 1.8em;
  color: #6699FF;
  margin-bottom: 10px;
  border-bottom: 1px solid #66CC66;
  padding-bottom: 5px;
}

/* 書籍記事 */
.book {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 25px;
  border: 1px solid #ddd;
  border-left: 6px solid #6699FF;
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
  background-color: #fff;
}
.book:hover {
  transform: scale(1.02);
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}
.book_header {
  width: 100%;
  background-color: rgba(102,153,255,0.1);
  padding: 10px 15px;
  border-bottom: 1px dashed #66CC66;
}
.book_date {
  font-size: 1.1em;
  color: #66CC66;
}
.book_image {
  flex: 1 1 200px;
  background-color: #eee;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 150px;
  padding-top: 10px;
}
.book_image img {
  width: 320px;
  height: auto;
}
.book_data {
  flex: 2 1 300px;
  padding: 15px 20px;
}
.book_title {
  font-size: 1.6em;
  color: #6699FF;
  margin-bottom: 10px;
  position: relative;
}
.book_title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 40px;
  height: 3px;
  background-color: #66CC66;
}
.book_format,
.book_stock,
.book_description {
  font-size: 1em;
  color: #555;
  margin-bottom: 8px;
}

/* BOOTH ロゴ関連 */
.booth-link {
  text-decoration: none;
  transition: transform 0.3s;
  display: inline-block;
  margin-left: 10px;
}
.booth-link:hover {
  transform: scale(1.1);
}
.booth-logo {
  height: 24px;
  width: auto;
  margin: 0 12px;
}

/* フッター */
#pageFooter {
  text-align: center;
  padding: 20px 10px;
  margin-top: 30px;
  border-top: 2px solid rgba(255,255,255,0.6);
  background-color: #222;
  color: #fff;
}
#contact {
  margin-bottom: 15px;
}
#contact h2 {
  font-size: 1.8em;
  margin-bottom: 10px;
  color: #fff;
}
#contact p {
  margin: 0;
}
#contact a {
  display: inline-block;
  margin: 0 10px;
  padding: 8px 15px;
  background-color: #000;
  color: #6699FF;
  text-decoration: none;
  border-radius: 4px;
  font-weight: bold;
  transition: background-color 0.3s, color 0.3s;
}
#contact a:hover {
  background-color: #6699FF;
  color: #000;
}
#copyright {
  margin-top: 10px;
  font-size: 0.9em;
  line-height: 1.4;
}

/* --- 折りたたみ用共通スタイル --- */
.collapsible {
  position: relative;
  overflow: hidden;
  transition: max-height 0.5s ease;
}
.collapsible::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 40px;
  background: linear-gradient(to bottom, transparent, #fff);
  pointer-events: none;
}
.collapsible.expanded {
  max-height: 50000px !important;
}
.collapsible.expanded::after {
  display: none;
}

/* 初期状態の高さ制限 */
/* お仕事：15件分の高さ（例：450px）、下部150pxでフェードアウト */
.works-collapsed {
  max-height: 450px;
}
.works-collapsed::after {
  height: 150px;
}
/* 同人誌：全体で5冊分の高さ（例：1360px）、下部640pxでフェードアウト */
.books-collapsed {
  max-height: 1360px;
}
.books-collapsed::after {
  height: 640px;
}

/* --- スタイリッシュなトグルボタン --- */
.toggle-button {
  display: block;
  margin: 15px auto 0;
  padding: 10px 20px;
  font-size: 1em;
  background: #6699FF;
  color: #fff;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  transition: background 0.3s, transform 0.3s;
}
.toggle-button:hover {
  background: #5577DD;
  transform: translateY(-2px);
}

/* --- レスポンシブ対応 --- */
@media screen and (max-width: 767px) {
  #bgFrame {
    padding: 15px;
  }
  #content {
    max-width: 100%;
    padding: 15px;
    margin: 0 10px;
  }
  nav ul {
    flex-direction: column;
    align-items: center;
  }
  nav ul li {
    margin: 5px 0;
  }
  .section-title {
    font-size: 1.8em;
  }
  .book {
    flex-direction: column;
    align-items: center;
  }
  .book_image {
    width: 50%;
    padding-top: 10px;
    margin-bottom: 1.6em;
  }
  .book_image img {
    width: 100%;
    height: auto;
  }
  .book_data {
    width: 100%;
    padding: 10px;
    margin-top: 20px;
  }
}