/* リセット */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Yu Gothic', 'Meiryo', sans-serif;
  overflow-x: hidden;
  background: #000;
  color: white;
}

/* ナビゲーション - 固定ヘッダー */
nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 16px 50px;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

nav.scrolled {
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(20px);
  padding: 16px 50px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

nav .nav-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.25rem;
  font-weight: 300;
  letter-spacing: 0.25em;
  color: white;
  text-decoration: none !important;
  transition: opacity 0.3s ease;
  display: inline-block;
}

.logo:hover {
  opacity: 0.8;
  text-decoration: none !important;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  opacity: 0.75;
  transition: all 0.3s ease;
  font-weight: 300;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 1px;
  background: white;
  transition: width 0.3s ease;
}

.nav-links a:hover {
  opacity: 1;
}

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

/* ヒーローセクション - グラデーション背景 */
.hero {
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #2c5f7d 0%, #4a7c9e 25%, #6b9ab8 50%, #5a8aa8 75%, #3d6b87 100%);
  background-size: 400% 400%;
  animation: gradientShift 20s ease infinite;
  z-index: 1;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.25);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  animation: fadeInUp 1.2s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-image {
  max-width: 600px;
  width: 90%;
  height: auto;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  border: 3px solid rgba(255, 255, 255, 0.3);
  transition: transform 0.3s ease;
}

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

/* スクロールインジケーター */
.scroll-indicator {
  position: absolute;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  animation: bounce 2s infinite;
  cursor: pointer;
  color: white;
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  opacity: 0.8;
  font-weight: 300;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-15px);
  }
  60% {
    transform: translateX(-50%) translateY(-8px);
  }
}

.scroll-indicator::before {
  content: '';
  display: block;
  width: 1px;
  height: 50px;
  background: white;
  margin: 0 auto 12px;
  opacity: 0.5;
}

/* コンテンツセクション */
.content-section {
  padding: 80px 50px;
  position: relative;
  background: linear-gradient(180deg, #000 0%, #0a1929 50%, #000 100%);
  min-height: 50vh;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
}

/* コンテンツグリッド */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 60px;
}

.content-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
  border-radius: 20px;
  padding: 35px 30px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transition: all 0.4s ease;
}

.content-card:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.12);
  box-shadow: 0 12px 40px rgba(74, 124, 158, 0.3);
}

.card-title {
  color: rgba(255, 255, 255, 0.95);
  font-size: 1.3rem;
  margin-bottom: 24px;
  font-weight: 500;
  letter-spacing: 0.1em;
}

/* 更新情報 */
.updates {
  margin-bottom: 20px;
}

.update-item {
  padding: 12px 0;
  transition: all 0.3s ease;
}

.update-item:hover {
  padding-left: 10px;
}

.update-date {
  font-size: 0.9rem;
  color: #6b9ab8;
  margin-bottom: 6px;
  font-weight: 500;
}

.update-text {
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
}

/* SNSリンク */
.social-links {
  display: flex;
  gap: 16px;
  margin: 20px 0;
  align-items: center;
}

.sns-link {
  display: block;
  transition: all 0.3s ease;
  text-decoration: none;
}

/* SNSアイコンのラッパー - 余白0.2B (正方形アイコン) */
.sns-icon-wrapper {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  /* 0.2B = アイコン幅の20% = 12pxの余白 (60pxベースの場合) */
  padding: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  overflow: hidden;
}

/* アイコン画像本体 - 36px × 36px (60px - 12px×2) */
.sns-icon {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.sns-link:hover .sns-icon-wrapper {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 25px rgba(107, 154, 184, 0.4);
  border-color: rgba(107, 154, 184, 0.5);
  background: rgba(107, 154, 184, 0.15);
}

/* SNSバナー画像 */
.sns-banners {
  display: flex;
  gap: 20px;
  margin: 30px 0 0 0;
  justify-content: center;
  flex-wrap: wrap;
}

.sns-banner-small {
  height: 31px;
  width: auto;
  max-width: 88px;
  display: block;
  opacity: 0.85;
  transition: all 0.3s ease;
}

.sns-banner-small:hover {
  opacity: 1;
  transform: scale(1.05);
}

/* 注釈 */
.note {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.7;
  margin-top: 16px;
}

/* フッター */
.site-footer {
  text-align: center;
  margin-top: 50px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  font-weight: 300;
}

/* パララックス効果 */
.parallax {
  transition: transform 0.1s ease-out;
}

/* レスポンシブ */
@media (max-width: 768px) {
  nav {
    padding: 15px 20px;
  }
  
  nav.scrolled {
    padding: 15px 20px;
  }
  
  nav .nav-content {
    flex-direction: column;
    gap: 18px;
  }
  
  .logo {
    font-size: 1.2rem;
  }
  
  .nav-links {
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .nav-links a {
    font-size: 0.85rem;
  }
  
  .hero-image {
    max-width: 90%;
  }
  
  .content-section {
    padding: 70px 20px;
  }
  
  .content-grid {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  
  .content-card {
    padding: 28px 24px;
  }
  
  .card-title {
    font-size: 1.15rem;
  }
  
  .scroll-indicator {
    font-size: 0.75rem;
    bottom: 30px;
  }
}