/* ==========================================
   2023年〜現在：AIデザイン期（ライトテーマ）
   ========================================== */

:root {
  --era-bg: #f8f9fa;
  --era-text: #111827;
  --era-text-muted: #6b7280;
  --era-link: #0284c7;
  --era-accent: #0284c7;
  --era-font-heading: 'Noto Sans JP', sans-serif;
  --era-font-body: 'Noto Sans JP', sans-serif;
  --era-border-radius: 12px;
  --era-card-bg: #ffffff;
  --era-card-border: rgba(0, 0, 0, 0.08);
  --era-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --era-aurora-blue: #7dd3fc;
  --era-aurora-blue-dark: #0284c7;
  --era-aurora-purple: #a78bfa;
  --era-aurora-purple-dark: #7c3aed;
  --era-aurora-green: #34d399;
}

body[data-era="2023"] {
  background: var(--era-bg);
  color: var(--era-text);
}

@keyframes aurora-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* ==========================================
   時代ヘッダー
   ========================================== */
body[data-era="2023"] .era-header {
  background: rgba(248, 249, 250, 0.92);
  border-bottom: 1px solid var(--era-card-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 1rem 2rem;
  position: sticky;
  top: 64px;
  z-index: 100;
}

body[data-era="2023"] .era-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

body[data-era="2023"] .era-site-name {
  font-size: 1.4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--era-aurora-blue-dark), var(--era-aurora-purple-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

body[data-era="2023"] .era-nav {
  display: flex;
  gap: 1.5rem;
}

body[data-era="2023"] .era-nav a {
  color: var(--era-text-muted);
  font-size: 0.875rem;
  transition: color 0.2s;
}

body[data-era="2023"] .era-nav a:hover {
  color: var(--era-text);
  text-decoration: none;
}

/* ==========================================
   コンテンツ全体レイアウト
   ========================================== */
body[data-era="2023"] .era-body {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 1.5rem;
}

body[data-era="2023"] .era-content-area {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ==========================================
   トップニュース
   ========================================== */
body[data-era="2023"] .era-news-top {
  background: var(--era-card-bg);
  border: 1px solid var(--era-card-border);
  border-radius: var(--era-border-radius);
  box-shadow: var(--era-card-shadow);
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

/* オーロラグラデーションのトップボーダー */
body[data-era="2023"] .era-news-top::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--era-aurora-blue),
    var(--era-aurora-purple),
    var(--era-aurora-green),
    var(--era-aurora-blue)
  );
  background-size: 200% 100%;
  animation: aurora-shift 4s ease infinite;
}

/* Generated by AI バッジ */
body[data-era="2023"] .era-news-top::after {
  content: '⚡ Generated by AI';
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  font-size: 0.65rem;
  color: var(--era-aurora-purple-dark);
  border: 1px solid rgba(124, 58, 237, 0.25);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: rgba(124, 58, 237, 0.05);
}

body[data-era="2023"] .era-news-category {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--era-aurora-blue-dark);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  background: rgba(2, 132, 199, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

body[data-era="2023"] .era-news-headline {
  font-size: 1.6rem;
  font-weight: 900;
  line-height: 1.35;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
  color: #0f172a;
}

body[data-era="2023"] .era-news-date {
  font-size: 0.75rem;
  color: var(--era-text-muted);
  margin-bottom: 1rem;
}

body[data-era="2023"] .era-news-body {
  font-size: 0.95rem;
  line-height: 1.85;
  color: #374151;
  white-space: pre-line;
}

/* ==========================================
   サブニュース グリッド（Bento風）
   ========================================== */
body[data-era="2023"] .era-news-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
}

body[data-era="2023"] .era-news-sub {
  background: var(--era-card-bg);
  border: 1px solid var(--era-card-border);
  border-radius: var(--era-border-radius);
  box-shadow: var(--era-card-shadow);
  padding: 1.25rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

body[data-era="2023"] .era-news-sub:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

/* 1枚目は2カラム分（Bento感） */
body[data-era="2023"] .era-news-sub:first-child {
  grid-column: span 2;
}

body[data-era="2023"] .era-news-sub .era-news-category {
  font-size: 0.65rem;
  margin-bottom: 0.5rem;
}

body[data-era="2023"] .era-news-sub h3 {
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.5rem;
  color: #0f172a;
}

body[data-era="2023"] .era-news-sub .era-news-date {
  font-size: 0.7rem;
  margin-bottom: 0.5rem;
}

body[data-era="2023"] .era-news-sub p:last-child {
  font-size: 0.8rem;
  line-height: 1.6;
  color: #6b7280;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================
   サイドバー
   ========================================== */
body[data-era="2023"] .era-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-self: start;
  position: sticky;
  top: calc(64px + 60px);
}

body[data-era="2023"] .era-sidebar-widget {
  background: var(--era-card-bg);
  border: 1px solid var(--era-card-border);
  border-radius: var(--era-border-radius);
  box-shadow: var(--era-card-shadow);
  padding: 1.25rem;
}

body[data-era="2023"] .era-sidebar-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--era-text-muted);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--era-card-border);
}

body[data-era="2023"] .era-ranking {
  list-style: none;
  counter-reset: ranking;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

body[data-era="2023"] .era-ranking li {
  font-size: 0.8rem;
  line-height: 1.4;
  color: #374151;
  padding-left: 1.5rem;
  position: relative;
  counter-increment: ranking;
}

body[data-era="2023"] .era-ranking li::before {
  content: counter(ranking);
  position: absolute;
  left: 0;
  color: var(--era-aurora-blue-dark);
  font-weight: 700;
  font-size: 0.72rem;
}

body[data-era="2023"] .era-sidebar-ad {
  background: linear-gradient(
    135deg,
    rgba(2, 132, 199, 0.04),
    rgba(124, 58, 237, 0.04)
  );
  border: 1px solid rgba(2, 132, 199, 0.15);
  border-radius: var(--era-border-radius);
  padding: 1.25rem;
  font-size: 0.78rem;
  color: var(--era-text-muted);
  text-align: center;
  line-height: 1.7;
}

/* ==========================================
   フッター
   ========================================== */
body[data-era="2023"] .era-footer {
  background: #f0f2f5;
  border-top: 1px solid var(--era-card-border);
  padding: 2rem;
  margin-top: 0;
}

body[data-era="2023"] .era-trivia {
  background: var(--era-card-bg);
  border: 1px solid var(--era-card-border);
  border-radius: var(--era-border-radius);
  padding: 1rem 1.25rem;
  font-size: 0.85rem;
  color: var(--era-text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

body[data-era="2023"] .era-footer-nav {
  padding: 0 0 1.5rem;
}

body[data-era="2023"] .era-nav-btn {
  color: var(--era-aurora-blue-dark);
  border-color: rgba(2, 132, 199, 0.3);
}

body[data-era="2023"] .era-nav-btn:hover {
  background: rgba(2, 132, 199, 0.06);
}

body[data-era="2023"] .era-copyright {
  font-size: 0.75rem;
  color: var(--era-text-muted);
  text-align: center;
}

/* ==========================================
   タイピングアニメーション
   ========================================== */
.typing-cursor::after {
  content: '|';
  animation: blink-cursor 0.75s step-end infinite;
  margin-left: 1px;
  color: var(--era-aurora-blue-dark);
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ==========================================
   レスポンシブ（モバイル）
   ========================================== */
@media (max-width: 768px) {
  body[data-era="2023"] .era-body {
    grid-template-columns: 1fr;
    padding: 1rem;
  }

  body[data-era="2023"] .era-news-grid {
    grid-template-columns: 1fr;
  }

  body[data-era="2023"] .era-news-sub:first-child {
    grid-column: span 1;
  }

  body[data-era="2023"] .era-news-headline {
    font-size: 1.25rem;
  }

  body[data-era="2023"] .era-sidebar {
    position: static;
  }
}