/* =========================================
       ✨ モダン お知らせページ (Changelog UI)
       ========================================= */
    :root {
        --primary: #00c9a7;
        --primary-light: #e0fdf9;
        --text-main: #1a202c;
        --text-muted: #718096;
        --bg-gray: #f8fafc;
        --radius-lg: 24px;
        --shadow-sm: 0 4px 15px rgba(0,0,0,0.02);
        --shadow-md: 0 15px 35px rgba(0,0,0,0.06);
    }

    body { background: var(--bg-gray); } /* 全体を少しグレーにしてカードの白を際立たせる */
    
    .news-page { font-family: 'Noto Sans JP', sans-serif; padding: 80px 20px 120px; overflow-x: hidden; }
    .news-wrap { max-width: 800px; margin: 0 auto; }

    @keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

    /* 🏷️ ヘッダー */
    .news-header { text-align: center; margin-bottom: 60px; animation: fadeUp 0.6s cubic-bezier(0.2, 0.8, 0.2, 1); }
    .kicker { font-size: 13px; font-weight: 900; color: var(--primary); text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 16px; display: inline-flex; align-items: center; gap: 8px; background: var(--primary-light); padding: 8px 16px; border-radius: 50px; }
    .news-title { font-size: 36px; font-weight: 900; color: var(--text-main); margin: 0; letter-spacing: -1px; }

    /* ⏳ タイムラインコンテナ */
    .timeline { position: relative; animation: fadeUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) 0.1s both; }
    
    /* 縦線 */
    .timeline::before {
        content: ''; position: absolute; left: 24px; top: 10px; bottom: 0; width: 2px;
        background: linear-gradient(180deg, #edf2f7 0%, #edf2f7 80%, rgba(237,242,247,0) 100%);
    }

    /* 📄 記事カード */
    .news-article {
        position: relative; margin-left: 70px; margin-bottom: 40px;
        background: white; padding: 40px; border-radius: var(--radius-lg);
        border: 1px solid #edf2f7; box-shadow: var(--shadow-sm);
        transition: 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    }
    .news-article:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: #e2e8f0; }

    /* タイムラインのドット */
    .news-article::before {
        content: ''; position: absolute; left: -51px; top: 40px; width: 12px; height: 12px;
        border-radius: 50%; background: white; border: 4px solid var(--primary);
        box-shadow: 0 0 0 4px var(--bg-gray); z-index: 2; transition: 0.3s;
    }
    .news-article:hover::before { transform: scale(1.2); background: var(--primary-light); }

    /* 記事メタデータ（バッジと日付） */
    .article-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
    .badge { font-size: 11px; font-weight: 900; padding: 6px 14px; border-radius: 50px; letter-spacing: 0.5px; display: inline-flex; align-items: center; gap: 4px; }
    .badge.feature { background: linear-gradient(135deg, #00c9a7 0%, #20d8b8 100%); color: white; box-shadow: 0 4px 10px rgba(0,201,167,0.2); }
    .badge.release { background: #1e293b; color: white; box-shadow: 0 4px 10px rgba(30,41,59,0.15); }
    
    .article-date { color: #a0aec0; font-size: 13px; font-weight: 700; font-family: 'Courier New', Courier, monospace; letter-spacing: -0.5px; }

    /* 記事内容 */
    .article-title { font-size: 20px; font-weight: 900; color: var(--text-main); margin: 0 0 16px; line-height: 1.4; letter-spacing: -0.5px; }
    .article-body { color: var(--text-muted); font-size: 15px; line-height: 1.8; margin: 0; font-weight: 500; }

    /* 📱 レスポンシブ */
    @media (max-width: 768px) {
        .news-page { padding: 40px 15px 80px; }
        .news-header { margin-bottom: 40px; }
        .news-title { font-size: 28px; }
        
        .timeline::before { left: 16px; }
        .news-article { margin-left: 45px; padding: 30px 20px; margin-bottom: 25px; border-radius: 20px; }
        .news-article::before { left: -34px; top: 35px; width: 10px; height: 10px; border-width: 3px; }
        
        .article-title { font-size: 18px; }
        .article-body { font-size: 14px; }
    }