/* ナビゲーション */
        nav ul {
            display: flex;
            list-style: none;
        }

        nav ul li {
            margin-left: 25px;
        }

        nav ul li a {
            text-decoration: none;
            color: #555;
            font-weight: 500;
            transition: color 0.3s;
        }

        nav ul li a:hover {
            color: #3a7db8;
        }

        .nav-icons {
            display: flex;
            align-items: center;
        }

        .nav-icons a {
            margin-left: 20px;
            color: #555;
            font-size: 18px;
            transition: color 0.3s;
        }

        .nav-icons a:hover {
            color: #3a7db8;
        }

        .cart-count {
            background-color: #e84c3d;
            color: white;
            border-radius: 50%;
            width: 18px;
            height: 18px;
            font-size: 0.7rem;
            display: flex;
            align-items: center;
            justify-content: center;
            position: absolute;
            top: -5px;
            right: -5px;
        }

        /* パンくずリスト */
        .breadcrumb {
            padding: 10px 0;
            font-size: 0.9rem;
        }

        .breadcrumb a {
            color: #3a7db8;
            text-decoration: none;
        }

        .breadcrumb span {
            color: #777;
        }

        /* 商品詳細 */
        .product-detail {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            padding: 10px 0;
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            margin: 0;
        }

        .product-gallery {
            position: relative;
        }

        .main-image {
            background-color: #f7f7f7;
            border-radius: 10px;
            max-height: 600px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 15px;
        }

        .main-image img {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
        }

        .thumbnail-container {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
            gap: 10px;
            padding: 0px 10px
        }

        .thumbnail {
            /* width: 80px;
            height: 80px; */
            border: 2px solid #eee;
            border-radius: 5px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: border-color 0.3s;
        }

        .thumbnail.active {
            border-color: #3a7db8;
        }

        .thumbnail img {
            max-width: 90%;
            max-height: 90%;
            object-fit: contain;
        }

        .product-info h1 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: #333;
        }

        .product-meta {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
        }

        .rating {
            color: #ffc107;
            margin-right: 10px;
        }

        .review-count {
            color: #777;
            font-size: 0.9rem;
        }

        .price {
            font-size: 1.2rem;
            color: #3a7db8;
            font-weight: bold;
            margin-bottom: 10px;
        }

        .product-description {
            margin-bottom: 10px;
            line-height: 1.5;
            color: #555;
        }

        .options {
            margin-bottom: 10px;
        }

        .option-title {
            font-weight: bold;
            margin-bottom: 10px;
            display: block;
        }

        .color-options {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 10px;
            margin-bottom: 10px;
        }

        .color-option {
            width: 100%;
            height: 100%;
            border-radius: 10%;
            cursor: pointer;
            border: 2px solid #eee;
            position: relative;
        }

        .color-option img {
            width: 100%;
        }

        .color-option.active {
            border-color: #3a7db8;
        }

        .color-option.active::after {
            content: '✓';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: white;
            font-weight: bold;
        }

        .quantity-selector {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
        }

        .quantity-btn {
            width: 40px;
            height: 40px;
            background-color: #f0f0f0;
            border: none;
            font-size: 1.2rem;
            cursor: pointer;
        }

        .quantity-input {
            width: 60px;
            height: 40px;
            text-align: center;
            border: 1px solid #ddd;
            margin: 0 5px;
        }

        .action-buttons {
            display: flex;
            gap: 15px;
        }

        .btn-cart {
            background-color: #3a7db8;
            color: white;
            border: none;
            padding: 10px 30px;
            border-radius: 20px;
            font-weight: bold;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: background-color 0.3s;
        }

        .btn-cart:hover {
            background-color: #2c6092;
        }

        .btn-buy {
            background-color: #e84c3d;
            color: white;
            border: none;
            padding: 10px 30px;
            border-radius: 20px;
            font-weight: bold;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: background-color 0.3s;
        }

        .btn-buy:hover {
            background-color: #c93c2e;
        }

        .product-features {
            margin-top: 10px;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
        }

        .feature {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .feature i {
            color: #3a7db8;
            font-size: 1.2rem;
        }

        /* 商品詳細タブ */
        .product-tabs {
            margin: 20px 0;
            background-color: #fff;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }

        .tabs {
            display: flex;
            border-bottom: 1px solid #eee;
        }

        .tab {
            padding: 15px 25px;
            cursor: pointer;
            font-weight: bold;
            color: #777;
            transition: color 0.3s;
        }

        .tab.active {
            color: #3a7db8;
            border-bottom: 3px solid #3a7db8;
        }

        .tab-content {
            padding: 25px;
        }

        .tab-pane {
            display: none;
        }

        .tab-pane.active {
            display: block;
        }

        .tab-pane img {
            width: 100%;
        }

        .tab-pane div span {
            white-space: normal !important;
        }


        .specs-table {
            width: 100%;
            border-collapse: collapse;
        }

        .specs-table tr {
            border-bottom: 1px solid #eee;
        }

        .specs-table th,
        .specs-table td {
            padding: 15px;
            text-align: left;
        }

        .specs-table th {
            width: 30%;
            color: #777;
            font-weight: normal;
        }

        /* レビュー */
        .review {
            padding: 20px 0;
            border-bottom: 1px solid #eee;
        }

        .review-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
        }

        .review-author {
            font-weight: bold;
        }

        .review-date {
            color: #777;
            font-size: 0.9rem;
        }

        /* 関連商品 */
        .related-products {
            margin: 20px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 10px;
            position: relative;
        }

        .section-title h2 {
            font-size: 1.8rem;
            color: #333;
            display: inline-block;
            padding-bottom: 10px;
            position: relative;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background-color: #3a7db8;
        }

        .product-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
        }

        .product-card {
            background-color: #fff;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s;
        }

        .product-card:hover {
            transform: translateY(-5px);
        }

        .product-img {
            /* height: 200px; */
            background-color: #f7f7f7;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .product-img img {
            max-width: 100%;
            max-height: 80%;
            object-fit: contain;
        }

        .product-info {
            padding: 10px;
            text-align: center;
        }

        .product-info h3 {
            margin-bottom: 5px;
            color: #333;
        }

        .product-info .price {
            font-size: 1rem;
            margin-bottom: 5px;
        }

        .gift_html select {
            padding: 10px;
            width: 100%;
            border-radius: 5px;
            border: 1px solid #ddd;
            margin-bottom: 10px;
        }

        .select-sttr {
            padding: 10px;
            width: 100%;
            border-radius: 5px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
        }


        /* レスポンシブデザイン */
        @media (max-width: 992px) {
            .product-detail {
                grid-template-columns: 1fr;
            }

            .main-image {
                width: 99%;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                flex-direction: column;
            }

            nav ul {
                margin-top: 20px;
                flex-wrap: wrap;
                justify-content: center;
            }

            nav ul li {
                margin: 0 10px 10px;
            }

            .nav-icons {
                margin-top: 20px;
            }

            .action-buttons {
                flex-direction: column;
            }

            .product-features {
                grid-template-columns: 1fr;
            }

            .product-grid {
                grid-template-columns: 1fr 1fr;
                gap: 15px;
            }
        }

        /* ハンバーガーメニュー */
        .hamburger {
            display: none;
            cursor: pointer;
            font-size: 24px;
        }

        @media (max-width: 576px) {
            .hamburger {
                display: block;
                position: absolute;
                top: 20px;
                right: 20px;
            }

            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                text-align: center;
            }

            nav ul.show {
                display: flex;
            }

            nav ul li {
                margin: 10px 0;
            }

            .nav-icons {
                margin-top: 15px;
            }

            .tabs {
                flex-direction: column;
            }

            .tab {
                text-align: center;
            }
        }