/* ============================================
   CSS リセット・基本設定
   ============================================ */

/* 全要素のボックスサイズ計算方法を統一 */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ルート要素の設定（スムーズスクロール） */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

/* 基本のフォント・色設定 */
body {
  font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'メイリオ', sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: #333;
  background-color: #fff;
}

/* リンクの基本スタイル */
a {
  color: #2c5282;
  text-decoration: none;
  transition: color 0.3s ease, opacity 0.3s ease;
}

a:hover {
  color: #1a365d;
  opacity: 0.8;
}

/* 画像のレスポンシブ対応 */
img {
  max-width: 100%;
  height: auto;
  vertical-align: bottom;
}

/* リストのデフォルトスタイルをリセット */
ul, ol {
  list-style: none;
}


/* ============================================
   共通レイアウト
   ============================================ */

/* コンテナ：コンテンツの最大幅を制限し中央揃え */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* セクション共通スタイル */
.section {
  padding: 80px 0;
}

/* セクションタイトル */
.section-title {
  font-family: 'Hannari Mincho', serif;
  font-size: 2rem;
  font-weight: 500;
  text-align: center;
  margin-bottom: 50px;
  position: relative;
  color: #1a365d;
}

/* セクションタイトルの下線装飾 */
.section-title::after {
  content: '';
  display: block;
  width: 90px;
  height: 2px;
  background-color: #2c5282;
  margin: 15px auto 0;
}


/* ============================================
   ヘッダー（ナビゲーションバー）
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  z-index: 1000;
}

.header-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

/* サイトタイトル（名前） */
.site-title {
  font-family: 'Hannari Mincho', serif;
  font-size: 1.3rem;
  font-weight: 500;
}

.site-title a {
  color: #1a365d;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.site-title a:hover {
  opacity: 1;
}

.site-title .en-name {
  font-size: 0.85rem;
  color: #666;
  font-weight: 400;
}

/* ナビゲーションメニュー */
.nav-list {
  display: flex;
  gap: 30px;
  align-items: center;
}

.nav-list a {
  font-size: 0.95rem;
  color: #333;
  padding: 5px 0;
  position: relative;
}

/* ナビゲーションリンクのホバー時下線 */
.nav-list a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: #2c5282;
  transition: width 0.3s ease;
}

.nav-list a:hover::after {
  width: 100%;
}

/* 言語切り替えボタン */
.lang-switch a {
  background-color: #2c5282;
  color: #fff !important;
  padding: 6px 15px;
  border-radius: 3px;
  font-size: 0.85rem;
}

.lang-switch a:hover {
  background-color: #1a365d;
}

.lang-switch a::after {
  display: none;
}

/* ハンバーガーメニューボタン（PC時は非表示） */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 25px;
  position: relative;
}

.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #333;
  position: absolute;
  transition: all 0.3s ease;
}

.menu-icon {
  top: 50%;
  transform: translateY(-50%);
}

.menu-icon::before {
  content: '';
  top: -8px;
}

.menu-icon::after {
  content: '';
  bottom: -8px;
}

/* ハンバーガーメニューがアクティブ時のアニメーション */
.menu-toggle.active .menu-icon {
  background-color: transparent;
}

.menu-toggle.active .menu-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle.active .menu-icon::after {
  bottom: 0;
  transform: rotate(-45deg);
}


/* ============================================
   メインビジュアル（ヒーローセクション）
   ============================================ */

.hero {
  /* 背景画像スライド（表示領域を4:3に固定） */
  background-color: #e8eef5;
  background-size: cover;
  background-position: center;
  aspect-ratio: 16 / 7.5; /* 保持したい縦横比 (16:8) */
  width: 100%;
  max-width: 100%;
  min-height: 0; /* aspect-ratio を優先 */
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 70px; /* ヘッダーの高さ分 */
  position: relative;
}

/* 背景画像使用時のオーバーレイ */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  /* background-color: rgba(0, 0, 0, 0.3); */
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 4;
  padding: 24px 28px;
  background: rgba(0, 0, 0, 0.45);
  color: #fff;
  border-radius: 10px;
  display: inline-block;
  max-width: 90%;
}

/* Slideshow styles */
.hero-slides {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 0.9s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}
.slide.active {
  opacity: 1;
  z-index: 0;
}
.slide .hero-content { z-index: 2; }
.slide-controls {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 3;
}
.slide-prev, .slide-next {
  background: rgba(255,255,255,0.9);
  border: none;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1.1rem;
}
.slide-prev:hover, .slide-next:hover { opacity: 0.9; }
.slide-dots { display:flex; gap:8px; }
.slide-dots button { width:10px; height:10px; border-radius:50%; background: rgba(255,255,255,0.6); border:none; cursor:pointer; }
.slide-dots button.active { background: #2c5282; }

/* Ensure hero background fallback remains for very old browsers */
.hero { background-color: #e8eef5; }

.hero-title {
  font-family: 'Hannari Mincho', serif;
  font-size: 2.5rem;
  font-weight: 500;
  color: #1a365d;
  margin-bottom: 20px;
  /* 背景画像使用時は白文字に: color: #fff; */
}

.hero-subtitle {
  font-size: 1.1rem;
  color: #555;
  /* 背景画像使用時は白文字に: color: rgba(255,255,255,0.9); */
}


/* ============================================
   About（自己紹介）セクション
   ============================================ */

.section-about {
  background-color: #fff;
}

.about-content {
  display: flex;
  gap: 50px;
  align-items: flex-start;
}

/* プロフィール写真エリア */
.about-image {
  flex-shrink: 0;
  width: 250px;
}

.about-image img {
  border-radius: 5px;
}

/* 画像プレースホルダー（仮表示用） */
.image-placeholder {
  background-color: #d1d5db;
  color: #6b7280;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 500;
  aspect-ratio: 1 / 1;
  border-radius: 5px;
}

/* プロフィールテキストエリア */
.about-text {
  flex: 1;
}

.about-name {
  font-family: 'Hannari Mincho', serif;
  font-size: 1.8rem;
  font-weight: 500;
  color: #1a365d;
  margin-bottom: 5px;
}

.about-name .name-en {
  font-size: 1rem;
  color: #666;
  margin-left: 15px;
  font-weight: 400;
}

.about-position {
  font-size: 1rem;
  color: #555;
  margin-bottom: 20px;
}

.about-description {
  margin-bottom: 30px;
  text-align: justify;
}

.about-subtitle {
  font-size: 1.1rem;
  font-weight: 500;
  color: #1a365d;
  margin-bottom: 15px;
  padding-bottom: 8px;
  border-bottom: 1px solid #e2e8f0;
}

/* 経歴リスト */
.career-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 20px;
}

.career-list dt {
  font-size: 0.95rem;
  color: #555;
}

.career-list dd {
  font-size: 0.95rem;
}


/* ============================================
   Research（研究内容）セクション
   ============================================ */

.section-research {
  background-color: #f7fafc;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.research-card {
  background-color: #fff;
  border-radius: 5px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.research-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.research-image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.research-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.research-image .image-placeholder {
  width: 100%;
  height: 100%;
  border-radius: 0;
}

.research-body {
  padding: 25px;
}

.research-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: #1a365d;
  margin-bottom: 10px;
}

.research-description {
  font-size: 0.95rem;
  color: #555;
  line-height: 1.7;
}


/* ============================================
   Publications（業績）セクション
   ============================================ */

.section-publications {
  background-color: #fff;
}

.publications-category {
  margin-bottom: 50px;
}

.publications-category:last-child {
  margin-bottom: 0;
}

.category-title {
  font-size: 1.2rem;
  font-weight: 500;
  color: #1a365d;
  margin-bottom: 25px;
  padding-bottom: 10px;
  border-bottom: 2px solid #e2e8f0;
}

.publications-list {
  counter-reset: pub-counter;
}

.publications-list:not(.no-number) {
  padding-left: 0;
}

.publication-item {
  padding: 15px 0 15px 50px;
  border-bottom: 1px solid #f0f0f0;
  position: relative;
  line-height: 1.7;
}

/* 番号付きリストのカウンター */
.publications-list:not(.no-number) .publication-item::before {
  counter-increment: pub-counter;
  content: counter(pub-counter) '.';
  position: absolute;
  left: 0;
  top: 15px;
  font-weight: 500;
  color: #2c5282;
  width: 35px;
  text-align: right;
}

/* 番号なしリスト */
.publications-list.no-number .publication-item {
  padding-left: 0;
}

.pub-authors {
  color: #555;
}

/* 自分の名前を強調 */
.author-me {
  font-weight: 600;
  color: #1a365d;
}

.pub-year {
  color: #666;
}

.hero-title {
  font-family: 'Hannari Mincho', serif;
  font-size: 2.5rem;
  font-weight: 500;
  color: inherit;
  margin-bottom: 12px;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.95);
}

/* Mobile adjustments for hero shade */
@media (max-width: 600px) {
  .hero-content {
    padding: 16px;
  }
  .hero-title {
    font-size: 1.6rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
}

.pub-link,
.project-btn {
  display: inline-block;
  margin-left: 8px;
  padding: 6px 14px;
  font-size: 0.85rem;
  background-color: #2c5282;
  color: #fff !important;
  border-radius: 4px;
  transition: background-color 0.3s ease;
  font-weight: 500;
}

.pub-link:hover,
.project-btn:hover {
  background-color: #1a365d;
  color: #fff !important;
}


/* ============================================
   Presentations（発表）セクション
   ============================================ */

.section-presentations {
  background-color: #f7fafc;
}

.presentations-category {
  margin-bottom: 50px;
}

.presentations-category:last-child {
  margin-bottom: 0;
}

.presentation-item {
  padding: 15px 0;
  border-bottom: 1px solid #e2e8f0;
  line-height: 1.7;
}

.pres-authors {
  color: #555;
}

.pres-title {
  display: block;
  font-weight: 500;
  color: #333;
  margin: 3px 0;
}

.pres-venue {
  color: #666;
}

.pres-date {
  color: #888;
  font-size: 0.9rem;
}

/* 発表形式のラベル */
.pres-type {
  display: inline-block;
  font-size: 0.8rem;
  padding: 2px 10px;
  border-radius: 3px;
  margin-left: 10px;
}

.pres-type.oral {
  background-color: #c6f6d5;
  color: #22543d;
}

.pres-type.poster {
  background-color: #feebc8;
  color: #744210;
}


/* ============================================
   News（お知らせ）セクション
   ============================================ */

.section-news {
  background-color: #fff;
}

.news-list {
  max-width: 800px;
  margin: 0 auto;
}

.news-item {
  display: flex;
  gap: 25px;
  padding: 18px 0;
  border-bottom: 1px solid #f0f0f0;
}

.news-date {
  flex-shrink: 0;
  font-size: 0.9rem;
  color: #666;
  width: 100px;
}

.news-content {
  flex: 1;
}


/* ============================================
   Contact（連絡先）セクション
   ============================================ */

.section-contact {
  background-color: #e8eef5;
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

/* Projects / Activities セクション（既存の配色と同系色に合わせる） */
.section-projects {
  background-color: #f7fafc; /* research/presentations と同系色 */
}

/* Projects / Outreach list (supports both ul/li and div/article structures) */
.projects-list {
  max-width: 900px;
  margin: 0 auto;
  list-style: none;
  padding: 0;
}

.projects-list .project-item {
  background-color: #fff;
  padding: 18px 20px;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  margin-bottom: 18px;
  border-left: 4px solid #2c5282;
}

.project-date {
  display: inline-block;
  font-size: 0.9rem;
  color: #666;
  font-weight: 500;
  margin-right: 12px;
}

.project-title {
  font-size: 1rem;
  font-weight: 500;
  color: #1a365d;
  display: inline-block;
  margin-right: 8px;
}

.project-description {
  display: block;
  margin-top: 6px;
  font-size: 0.95rem;
  color: #555;
  line-height: 1.6;
}

.section-activities {
  background-color: #e8eef5; /* hero/contact と同系色 */
}
.activities-list {
  max-width: 900px;
  margin: 0 auto;
  padding: 0;
}
.activities-list .activity-item {
  display: flex;
  gap: 20px;
  padding: 12px 0;
  border-bottom: 1px solid #f0f0f0;
}

/* Grants list: support both <dl> (dt/dd) and <ul>/<li> forms */
.grants-list {
  max-width: 800px;
  margin: 0 auto;
  list-style: none;
  padding: 0;
}

.grants-list .grant-item,
.grants-list > div.grant-item {
  display: flex;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid #f0f0f0;
}

.grants-list dt.grant-date,
.grants-list .grant-date {
  flex-shrink: 0;
  font-size: 0.9rem;
  color: #666;
  width: 110px;
}

.grants-list dd.grant-content,
.grants-list .grant-content {
  flex: 1;
}

.contact-subtitle {
  font-size: 1rem;
  font-weight: 500;
  color: #1a365d;
  margin-bottom: 10px;
  margin-top: 30px;
}

.contact-subtitle:first-child {
  margin-top: 0;
}

.contact-affiliation {
  color: #555;
}

.contact-email {
  font-size: 1.1rem;
  color: #2c5282;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-links a {
  display: inline-block;
  padding: 8px 20px;
  background-color: #fff;
  border-radius: 3px;
  font-size: 0.95rem;
  transition: background-color 0.3s ease;
}

.contact-links a:hover {
  background-color: #f7fafc;
}


/* ============================================
   フッター
   ============================================ */

.footer {
  background-color: #1a365d;
  color: rgba(255, 255, 255, 0.8);
  padding: 30px 0;
  text-align: center;
}

.copyright {
  font-size: 0.85rem;
}


/* ============================================
   スクロールアニメーション
   ============================================ */

/* アニメーション対象の初期状態（非表示） */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

/* 表示状態 */
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 各要素に遅延をつける（カードやリストで使用） */
.fade-in.delay-1 { transition-delay: 0.1s; }
.fade-in.delay-2 { transition-delay: 0.2s; }
.fade-in.delay-3 { transition-delay: 0.3s; }
.fade-in.delay-4 { transition-delay: 0.4s; }
.fade-in.delay-5 { transition-delay: 0.5s; }


/* ============================================
   レスポンシブ対応（タブレット）
   ============================================ */

@media screen and (max-width: 900px) {
  /* リサーチセクションを2列に */
  .research-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* About セクションを縦並びに */
  .about-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .about-text {
    width: 100%;
  }
  
  .career-list {
    text-align: left;
  }
}


/* ============================================
   レスポンシブ対応（スマートフォン）
   ============================================ */

@media screen and (max-width: 768px) {
  /* ハンバーガーメニューを表示 */
  .menu-toggle {
    display: block;
  }
  
  /* ナビゲーションをモバイル用に */
  .nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: #fff;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
  }
  
  .nav.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .nav-list {
    flex-direction: column;
    gap: 0;
    padding: 15px 0;
  }
  
  .nav-list li {
    width: 100%;
  }
  
  .nav-list a {
    display: block;
    padding: 15px 25px;
  }
  
  .nav-list a::after {
    display: none;
  }
  
  .lang-switch {
    padding: 10px 25px;
  }
  
  .lang-switch a {
    display: inline-block;
  }
  
  /* サイトタイトルを小さく */
  .site-title {
    font-size: 1.1rem;
  }
  
  .site-title .en-name {
    display: none;
  }
  
  /* ヒーローセクション */
  .hero {
    min-height: 50vh;
  }

  /* Ensure aspect-ratio respected on small screens */
  .hero {
    aspect-ratio: 16 / 8;
  }
  
  .hero-title {
    font-size: 1.8rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  /* セクション */
  .section {
    padding: 60px 0;
  }
  
  .section-title {
    font-size: 1.6rem;
    margin-bottom: 35px;
  }
  
  /* リサーチセクションを1列に */
  .research-grid {
    grid-template-columns: 1fr;
  }
  
  /* Aboutセクション */
  .about-image {
    width: 180px;
  }
  
  .about-name {
    font-size: 1.5rem;
  }
  
  .about-name .name-en {
    display: block;
    margin-left: 0;
    margin-top: 5px;
  }
  
  /* Publicationsセクション */
  .publication-item {
    padding-left: 35px;
  }
  
  .publication-item::before {
    width: 25px;
  }
  
  /* Newsセクション */
  .news-item {
    flex-direction: column;
    gap: 5px;
  }
  
  .news-date {
    width: auto;
  }
  
  /* Contactセクション */
  .contact-links {
    flex-direction: column;
    align-items: center;
  }
}


/* ============================================
   印刷用スタイル
   ============================================ */

@media print {
  .header,
  .menu-toggle {
    display: none;
  }
  
  .hero {
    margin-top: 0;
    min-height: auto;
    padding: 30px 0;
  }
  
  .section {
    padding: 30px 0;
  }
  
  /* 印刷時はアニメーションを無効化 */
  .fade-in {
    opacity: 1;
    transform: none;
  }
}