body {
  margin: 0;
  font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Yu Gothic Medium', 'Meiryo', 'Helvetica Neue', sans-serif;
  background-color: #f8f9fa;
  color: #111;
  line-height: 1.7;
  padding-top: 90px;
}

/* Hero Section */
.hero {
  position: relative;
  background: white;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
  padding: 60px 40px;
  gap: 60px;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: #333;
  padding: 20px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.2s forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
  from {
    opacity: 0;
    transform: translateY(30px);
  }
}

.hero-content h1 {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 15px;
}

.hero-content p {
  font-size: 1.3rem;
  opacity: 0.95;
}

/* Hero Section - 2カラムレイアウト */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
  gap: 60px;
  height: auto;
  min-height: 400px;
}

.hero-image-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-marmoset-image {
  width: 100%;
  max-width: 450px;
  height: auto;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}

.hero-marmoset-image:hover {
  transform: scale(1.02);
}

/* レスポンシブ対応 */
@media screen and (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
    padding: 40px 30px;
  }
  
  .hero-content {
    order: -1;
  }
  
  .hero-marmoset-image {
    max-width: 400px;
  }
}

@media screen and (max-width: 768px) {
  .hero {
    padding: 30px 20px;
  }
  
  .hero-marmoset-image {
    max-width: 320px;
  }
}

/* Main Content */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 20px;
}

/* Filter Section */
.filter-section {
  background: white;
  border-radius: 10px;
  padding: 40px 30px;
  margin-bottom: 30px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  text-align: center;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  justify-content: center;
  margin-bottom: 25px;
}

.filter-btn {
  background: white;
  border: 2px solid #1e3c72;
  padding: 10px 24px;
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s;
  font-weight: 500;
  color: #1e3c72;
  font-size: 0.95rem;
}

.filter-btn:hover, .filter-btn.active {
  background: #1e3c72;
  color: white;
  transform: translateY(-2px);
}

.search-box {
  max-width: 400px;
  margin: 0 auto;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 12px 20px;
  border: 2px solid #e9ecef;
  border-radius: 25px;
  font-size: 16px;
  outline: none;
  transition: border-color 0.3s;
}

.search-box input:focus {
  border-color: #1e3c72;
}

/* News Section */
.news-section {
  background: transparent;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
}

.section-title {
  font-size: 2.5rem;
  color: #1e3c72;
  margin-bottom: 60px;
  text-align: center;
  font-weight: 600;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.6s ease forwards;
}

/* パターン2: 超ミニマル - タイムライン削除 */
.news-timeline {
  position: relative;
  padding: 0;
  background: white;
  border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  overflow: hidden;
}

/* タイムラインの線を削除 */
.news-timeline::before {
  display: none;
}

.news-item {
  position: relative;
  margin: 0;
  background: white;
  border-radius: 0;
  padding: 25px 30px;
  border-bottom: 1px solid #e0e0e0;
  transition: all 0.3s ease;
  border-left: none;
  opacity: 0;
  transform: translateY(20px);
  animation: slideIn 0.5s ease forwards;
}

.news-item:nth-child(1) { animation-delay: 0.1s; }
.news-item:nth-child(2) { animation-delay: 0.15s; }
.news-item:nth-child(3) { animation-delay: 0.2s; }
.news-item:nth-child(4) { animation-delay: 0.25s; }
.news-item:nth-child(5) { animation-delay: 0.3s; }
.news-item:nth-child(6) { animation-delay: 0.35s; }

@keyframes slideIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 最初のアイテム */
.news-item:first-child {
  border-radius: 10px 10px 0 0;
}

/* 最後のアイテム */
.news-item:last-child {
  border-radius: 0 0 10px 10px;
  border-bottom: none;
}

/* 丸ポイントを削除 */
.news-item::before {
  display: none;
}

.news-item:hover {
  background: #f8f9fa;
  padding-left: 35px;
  transform: none;
}

.news-date {
  display: inline-block;
  font-size: 0.9rem;
  color: #666;
  font-weight: 500;
  margin-bottom: 0;
  margin-right: 12px;
}

.news-category {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 500;
  color: white;
}

.news-category.publication { 
  background: #e8f5e9;
  color: #388e3c;
}

.news-category.event { 
  background: #e3f2fd;
  color: #1976d2;
}

.news-category.award { 
  background: #fff3e0;
  color: #f57c00;
}

.news-category.milestone { 
  background: #fce4ec;
  color: #c2185b;
}

.news-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: #333;
  margin-top: 15px;
  margin-bottom: 10px;
  line-height: 1.5;
}

.news-description {
  color: #666;
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.news-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 12px;
  flex-wrap: wrap;
}

.news-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  color: #667eea;
  text-decoration: none;
  border-radius: 15px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
  background: transparent;
  box-shadow: none;
}

.news-link:hover {
  color: #764ba2;
  transform: none;
  background: transparent;
  box-shadow: none;
}

.news-link-icon {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.loading {
  text-align: center;
  padding: 40px;
  color: #666;
  font-style: italic;
}

.no-results {
  text-align: center;
  padding: 40px;
  color: #666;
  font-style: italic;
}

.auto-update-badge {
  position: fixed;
  top: 100px;
  right: 20px;
  background: rgba(76, 175, 80, 0.9);
  color: white;
  padding: 8px 15px;
  border-radius: 20px;
  font-size: 12px;
  z-index: 1001;
  display: none;
}

/* Responsive */
@media screen and (max-width: 768px) {
  .hero-content h1 { 
    font-size: 2.5rem;
  }
  
  .hero-content p { 
    font-size: 1.1rem;
  }
  
  .news-item {
    padding: 20px;
  }
  
  .news-item:hover {
    padding-left: 25px;
  }
  
  .filter-buttons {
    justify-content: flex-start;
  }
  
  .filter-btn {
    padding: 8px 15px;
    font-size: 0.9em;
  }

  .news-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .news-link {
    width: 100%;
    justify-content: center;
  }
}

/* ===== フッター ===== */
.footer {
  background: #1e3c72;
  color: white;
  text-align: center;
  padding: 40px 20px;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

.copyright {
  font-size: 0.85em;
  opacity: 0.8;
  line-height: 1.6;
}