@charset "utf-8";
/* CSS Document */
        :root {
            /* ベースカラーの定義を統一 */
            --color-primary: #37474F; /* ディープネイビー/チャコール (メインカラー) */
            --color-secondary: #546E7A; /* Muted Slate Blue (アクセントカラー) */
            --color-text-dark: #333333;
            --color-text-light: #666666;
            --color-bg-light: #F8F8F8; /* オフホワイト/淡いグレー */
			--color-bg-white: #FFFFFF; /* ホワイト */
            --font-serif: 'Noto Serif JP', serif; /* 明朝体/セリフ体 */
            --font-sans: 'Noto Sans JP', sans-serif; /* ゴシック体/サンセリフ体 */
        }

        body {
            font-family: var(--font-serif); /* 全体的に明朝体ベース */
            color: var(--color-text-dark);
            line-height: 1.8; /* 行間を広めに設定 */
            background-color: white;
            overflow-x: hidden;
        }

        .section-padding {
            padding: 6rem 0; /* セクションの上下余白を大きく */
        }
        @media (max-width: 991.98px) {
            .section-padding {
                padding: 4rem 0;
            }
        }

        /* ゴシック体が必要な部分 */
        .text-sans-serif {
            font-family: var(--font-sans);
        }
        
        /* ====================================
            タイポグラフィ (見出し)
            ==================================== */
        h1, h2, h3, .display-5 {
            font-weight: 700; 
            color: var(--color-primary);
            line-height: 1.5;
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            padding-bottom: 0.5rem;
            position: relative;
            color: var(--color-primary);
        }
 
        .lead {
            font-weight: 500; 
            color: var(--color-primary); 
        }

        /* ====================================
            ヘッダー/ナビゲーション
            ==================================== */
        .navbar {
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }
        .navbar-brand span {
            font-family: var(--font-serif);
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--color-primary);
            margin-left: 0.5rem;
        }
        .nav-link {
            color: var(--color-primary) !important;
            font-family: var(--font-sans); 
            font-weight: 500;
        }
        .custom-btn-secondary[style*="background-color: var(--color-secondary)"] {
             /* 既存のinline styleを上書きせず、セレクタの特異度を調整 */
             background-color: var(--color-secondary) !important;
             color: white !important;
             border-color: var(--color-secondary) !important;
        }

        /* ====================================
            メインビジュアル 
            ==================================== */
        .main-visual {
            /* プレースホルダー画像を安定化 */
            background-image: url('https://www.interlink-inc.biz/product/MKDK_main.png');
            background-color: #E8EAE6; 
            background-size: cover;
            background-position: center center;
            min-height: 60vh; 
            display: flex;
            align-items: center;
            position: relative;
        }
        .main-visual-content {
            background-color: rgba(255, 255, 255, 0.4); 
            padding: 3rem;
            border-radius: 0.5rem;
            box-shadow: 0 10px 20px rgba(0,0,0,0.08);
        }
        @media (min-width: 992px) {
            .main-visual-content {
                max-width: 460px; 
                margin-left: 5%;
            }
        }
        .main-visual .display-5 {
            font-size: 2.5rem;
        }

@media (max-width: 991px) {
  .main-visual {
    background-position: 75% 50%;
  }
}

        /* ====================================
            ボタン
            ==================================== */
        .custom-btn-primary {
            background-color: var(--color-primary);
            border-color: var(--color-primary);
            color: white;
            padding: 0.8rem 2.5rem;
            border-radius: 0.25rem; 
            transition: all 0.3s;
            font-weight: 700;
            letter-spacing: 0.1em;
            font-family: var(--font-sans); 
        }
        .custom-btn-primary:hover {
            background-color: #212b4a; 
            border-color: #212b4a;
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }

        .custom-btn-secondary {
            background-color: var(--color-secondary); 
            border: 2px solid var(--color-secondary);
            color: white;
            padding: 1rem 3.5rem;
            border-radius: 0.25rem;
            font-size: 1.2rem;
            font-weight: 700;
            transition: all 0.3s;
            font-family: var(--font-sans);
        }
        .custom-btn-secondary:hover {
            background-color: var(--color-primary); 
            border-color: var(--color-primary);
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }

        /* ====================================
            特徴セクション
            ==================================== */
        .feature-card {
            background-color: white;
            padding: 2.5rem;
            border: 1px solid #EDEDED;
            transition: box-shadow 0.3s, transform 0.3s;
            height: 100%; 
        }
        .feature-card:hover {
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            transform: translateY(-5px);
        }
        .feature-icon {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--color-secondary); 
            margin-bottom: 1rem;
            font-family: var(--font-sans); 
        }
        .feature-title {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
            color: var(--color-primary);
        }
        .feature-text {
            color: var(--color-text-light);
            font-size: 0.95rem;
            line-height: 1.8;
            font-family: var(--font-sans); 
        }

        /* ====================================
            動画・科学セクション
            ==================================== */
        .bg-light-gray {
            background-color: var(--color-bg-light);
        }
		
		.bg-white {
            background-color: var(--color-bg-white);
        }

        .placeholder-image {
            background-color: #DDDDDD;
            min-height: 150px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-text-light);
            font-size: 1.2rem;
            border-radius: 0.5rem;
            font-family: var(--font-sans);
        }

        .vertical-video-container {
            max-width: 360px; 
            width: 100%;
            height: 640px; 
            background-color: #222222;
            margin: 0 auto; 
            border-radius: 1rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-family: var(--font-sans);
        }

        #concept .vertical-video-container {
            height: 500px; 
            max-width: 300px;
        }

        /* ====================================
            コンセプトセクション
            ==================================== */
        .lead-concept {
            font-family: var(--font-sans); 
            font-size: 1.25rem;
            color: var(--color-primary);
            line-height: 2.0;
            margin-bottom: 2rem;
        }

        .concept-body p {
            font-family: var(--font-sans); 
            font-size: 1.05rem; 
            line-height: 2.2; 
            margin-bottom: 0.8rem;
            color: var(--color-text-dark);
        }
        
        /* 黒丸ボタンのスタイル */
        .black-dot-btn {
            display: inline-flex;
            align-items: center;
            text-decoration: none;
            color: var(--color-primary); 
            border: 1px solid var(--color-primary);
            padding: 0.75rem 2.5rem 0.75rem 1.5rem; 
            border-radius: 9999px; 
            transition: all 0.3s ease-in-out;
            font-family: var(--font-sans);
            font-weight: 700;
            letter-spacing: 0.05em;
            position: relative;
            background-color: white;
        }

        .black-dot-btn:hover {
            color: white;
            background-color: var(--color-primary); 
            box-shadow: 0 5px 15px rgba(55, 71, 79, 0.3);
            border-color: var(--color-primary);
        }

        .black-dot-btn .circle {
            position: absolute;
            right: -1px; 
            top: -1px; 
            width: 48px;
            height: 48px;
            background-color: var(--color-secondary); 
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            transition: background-color 0.3s;
        }

        .black-dot-btn:hover .circle {
            background-color: white; 
            color: var(--color-secondary); 
        }

        .black-dot-btn-text {
            padding-right: 30px; 
        }
        
        .ratio-9x16 {
            --bs-aspect-ratio: calc(100 * 16 / 9); 
        }

        /* ====================================
            ラインナップセクション
            ==================================== */
        .lineup-card {
            border: 1px solid #EDEDED;
            background-color: white;
            padding: 1rem; 
            border-radius: 0.5rem;
            text-align: center;
            height: 100%;
            transition: transform 0.3s ease;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05); 
        }
        .lineup-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 15px rgba(0,0,0,0.1);
        }
        
        .product-img {
            width: 200px;
            height: 200px;
            object-fit: cover;
            border-radius: 0.3rem;
            margin: 0 auto 1rem;
            border: 1px solid #f0f0f0;
        }
        
        .carousel-item-lineup {
            padding: 1rem; 
        }
        .carousel-control-prev, .carousel-control-next {
            width: 10%; 
        }
        .carousel-control-prev-icon, .carousel-control-next-icon {
            background-color: var(--color-primary);
            border-radius: 50%;
            padding: 1rem;
            opacity: 0.8;
        }
        .carousel-control-prev:hover .carousel-control-prev-icon, 
        .carousel-control-next:hover .carousel-control-next-icon {
             opacity: 1;
        }
        
        /* ====================================
            製品情報セクション
            ==================================== */
        .product-details {
            margin-top: 1.5rem;
        }
        .product-details dt {
            font-family: var(--font-sans); 
            font-weight: 700;
            color: var(--color-primary);
            border-left: 4px solid var(--color-secondary);
            padding-left: 10px;
            margin-top: 1.5rem;
            margin-bottom: 0.2rem;
            font-size: 1.05rem;
        }
        .product-details dd {
            font-family: var(--font-sans); 
            color: var(--color-text-dark);
            margin-left: 14px;
            padding-bottom: 10px;
            border-bottom: 1px dashed #DDD;
            line-height: 1.6;
        }
        .product-details dd:last-child {
            border-bottom: none;
        }
        .product-details dt:first-child {
            margin-top: 0;
        }

        /* ====================================
            注意事項セクション

            ==================================== */
        .note-card {
            background-color: #FAFAFA;
            border: 1px solid #E0E0E0;
            border-radius: 0.5rem;
            padding: 1.5rem;
            height: 100%;
        }
        .note-title {
            font-family: var(--font-serif);
            font-size: 1.25rem;
            color: var(--color-primary);
            margin-bottom: 1rem;
            border-bottom: 1px solid var(--color-secondary);
            padding-bottom: 0.5rem;
            display: inline-block;
        }
        .note-content {
            font-family: var(--font-sans);
            font-size: 0.95rem;
            color: var(--color-text-light);
            line-height: 1.8;
        }
        /* 禁止事項の特別スタイル */
        .note-card.prohibited {
            background-color: #FFF5F5;
            border: 1px solid #FFCDD2;
        }
        .note-card.prohibited .note-title {
            color: #C62828;
            border-bottom-color: #C62828;
        }
        .note-card.prohibited .note-content {
            color: #C62828;
            font-weight: 700;
            font-size: 1.1rem;
        }
        
        /* ====================================
            FAQスタイル
            ==================================== */
        .accordion-item {
            border: 1px solid #e0e0e0;
            margin-bottom: 15px;
            border-radius: 0.5rem;
            overflow: hidden;
        }
        .accordion-button {
            font-family: var(--font-sans);
            font-weight: 700;
            color: var(--color-primary);
            background-color: white;
            padding: 1.25rem 1.5rem;
            font-size: 1.1rem;
        }
        .accordion-button:not(.collapsed) {
            color: white;
            background-color: var(--color-secondary);
            box-shadow: none;
        }
        .accordion-body {
            font-family: var(--font-sans);
            color: var(--color-text-dark);
            background-color: var(--color-bg-light);
            line-height: 1.8;
            font-size: 1rem;
        }
        .faq-q {
            color: var(--color-primary);
            font-weight: 700;
            margin-right: 0.5rem;
        }

        /* ====================================
            フッター
            ==================================== */
        .custom-footer {
            background-color: var(--color-primary);
            color: #CCCCCC;
            font-family: var(--font-sans);
        }
        .footer-link {
            color: #CCCCCC;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-link:hover {
            color: white;
        }