body {
    font-size: medium;
}
     
     .download-section {
            max-width: 1000px;
            margin: 60px auto;
            padding: 0 20px;
        }

        .section-title {
            font-size: 28px;
            color: #ffffff;
            margin-bottom: 40px;
            text-align: center;
            letter-spacing: 2px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .section-title::before,
        .section-title::after {
            content: "";
            display: inline-block;
            width: 30px;
            height: 4px;
            background-color: #e60000;
            transform: skewX(-30deg);
            margin: 0 15px;
        }

        /* ==============================
           ダウンロードグリッド
           ============================== */
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
        }

        /* カードデザイン */
        .download-card {
            background-color: #1a1a1a;
            border: 1px solid #2a2a2a;
            border-top: 3px solid #333333;
            padding: 25px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
            transition: all 0.3s ease;
        }

        /* カードのホバー時アクション */
        .download-card:hover {
            border-top-color: #e60000;
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(230, 0, 0, 0.25);
            background-color: #1f1f1f;
        }

        /* ファイル種別バッジ */
        .file-badge {
            display: inline-block;
            background-color: #2a2a2a;
            color: #e60000;
            font-size: 11px;
            font-weight: 900;
            padding: 3px 8px;
            margin-bottom: 15px;
            letter-spacing: 1px;
            transition: all 0.3s ease;
        }

        .download-card:hover .file-badge {
            background-color: #e60000;
            color: #ffffff;
        }

        .card-title {
            font-size: 18px;
            color: #ffffff;
            margin: 0 0 10px 0;
            font-weight: bold;
            line-height: 1.4;
        }

        .card-desc {
            color: #aaaaaa;
            line-height: 1.6;
            margin: 0 0 20px 0;
        }

        /* ファイルメタ情報（サイズ・バージョン） */
        .file-meta {
            color: #666666;
            margin-bottom: 15px;
            display: flex;
            gap: 15px;
            border-top: 1px solid #2a2a2a;
            padding-top: 12px;
        }

        /* ==============================
           ダウンロードボタン（斜め加工＆矢印アイコン）
           ============================== */
        .btn-download {
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: #252525;
            color: #ffffff;
            text-decoration: none;
            padding: 12px;
            font-weight: bold;
            letter-spacing: 1px;
            transform: skewX(-12deg);
            transition: all 0.3s ease;
            border: 1px solid #333333;
        }

        .btn-download span {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transform: skewX(12deg);
        }

        /* CSSのみで作成した下向き矢印アイコン */
        .icon-dl {
            display: inline-block;
            width: 8px;
            height: 8px;
            border-right: 2px solid #e60000;
            border-bottom: 2px solid #e60000;
            transform: rotate(45deg);
            margin-bottom: 3px;
            transition: border-color 0.3s ease;
        }

        /* ホバー時のボタン発光 */
        .download-card:hover .btn-download {
            background-color: #e60000;
            border-color: #e60000;
            box-shadow: 0 4px 15px rgba(230, 0, 0, 0.4);
        }

        .download-card:hover .icon-dl {
            border-color: #ffffff;
        }

        /* レスポンシブ対応 */
        @media (max-width: 768px) {
            .download-grid {
                grid-template-columns: 1fr;
            }
        }