        <style>
        /* ------------------------------------- */
        /* 1. ベーススタイル & 共通ユーティリティ */
        /* ------------------------------------- */
        html{margin:0;
        box-sizing: border-box;}
        body {
        box-sizing: border-box;
            width: 100%;
            font-family:sans-serif;
            background-color: #fff; /* 薄い背景色 */
            margin: 0;
            padding: 0;
            line-height: 1.6;
        }
        .pc{display:none;}
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1em;
            box-sizing: border-box;
            width: 100%;
        }
        section {
            padding: 4rem 0;
            border-bottom: 1px solid #e2e8f0;
        }

        h1 { font-size: 3rem; font-weight: 800; line-height: 1.25; } /* lg:text-6xl 相当 */
        h2 { font-size: 1.4rem; font-weight: 900; color: #355e80; line-height: 1.2;} /* text-4xl 相当 */
        h3 { font-size: 2rem; font-weight: 900; color: #355e80;} /* text-3xl 相当 */
        h4 { font-size: 1.6rem; font-weight: 700; color: #355e80; margin:0;} /* text-xl 相当 */
        p { margin-bottom: 1rem; }

        .shadow-md { box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1); }
        .shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1); }
        .shadow-2xl { box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1); }
        .rounded-xl { border-radius: 0.75rem; }
        .rounded-lg { border-radius: 0.5rem; }
        .rounded-full { border-radius: 9999px; }
        .transition { transition: all 0.3s ease-in-out; }


        /* ------------------------------------- */
        /* 2. ヘッダー / グローバルメニュー */
        /* ------------------------------------- */
        #header {
            background-color: white;
            position: sticky;
            top: 0;
            z-index: 10;
        }
        #header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 6rem;
        }
        #logo {
            height: auto;
            width:280px;
            margin:0 auto;
        }
        #desktop-nav a {
            color: #4b5563; /* gray-600 */
            text-decoration: none;
            font-weight: 500;
            padding: 0 1rem;
        }
        #desktop-nav a:hover {
            color: #4f46e5; /* indigo-600 */
        }
        #mobile-menu {
            background-color: white;
            padding:1em;
            box-sizing: border-box;
            text-align: center;
        }
        #mobile-menu p{
            font-size: .8em;
            margin:0;
        }
        #mobile-menu .mobile-title img{
            width:70%;
            height: auto;
            margin-right: 5px;
            line-height: 1;
        }
        #mobile-menu .mobile-title{
            font-size: 1.2rem;
            font-weight: 900;
            color: #355e80;
        }
        /* ------------------------------------- */
        /* 3. メインビジュアル */
        /* ------------------------------------- */
        .main-visual {
            position: relative;
            background:url(img/mv_img3.jpg) no-repeat 0 0;
            background-size:cover;
            aspect-ratio: 128/48;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            height: 60vw;
        }
        .main-visual::before {
            content: '';
            position: absolute;
            inset: 0;
            background-color: black;
            opacity: 0.3;
        }
        .main-visual-text {
            z-index: 1;
            text-align: center;
            padding: 1rem;
        }
        .main-visual-text h1 {
            color: white;
        }
        .main-visual-text h1 img{
            width:95%;
            height: auto;
        }
        .main-visual-text p {
            font-size: 1.25rem;
            color: #c7d2fe; /* indigo-200 */
        }

        /* ------------------------------------- */
        /* 4. CTA & コンテンツグリッド */
        /* ------------------------------------- */
        /* .grid-section { padding: 3rem 0; background-color: white; } */
        .section-cta { padding: 4rem 0; background-color: #4f46e5; } /* indigo-600 */

        .cta-card, .content-card {
            padding: 1rem 0;
            text-align: center;
        }
        .cta-grid a{
            min-width: 280px;
        }
        .cta-card a i{
            font-size:.9rem;
            font-style: normal;
        }
        .content-card h4{
            margin:0;
        }
        .sec1{
            background:url(img/bg_section.svg) no-repeat;
            background-position:150px -30%;
            background-size:100%;
            background-attachment: fixed;
            box-sizing: border-box;
            width: 100%;
        }
        .about-fes h2 img{
            width:60%;
            height: auto;
        }
        .about-fes h2 span{
            font-size: 1rem;
            display: block;
        }



        /* CTA 3列 */
        .cta-bg{
            background: #FFFBBF;
            background: linear-gradient(90deg,rgba(255, 251, 191, 1) 15%, rgba(0, 223, 201, 1) 55%, rgba(159, 165, 255, 1) 93%);
        }
        .cta-grid {
            display: grid;
            gap: 0;
            grid-template-columns: repeat(3, 1fr);
            grid-template-columns: 1fr; /* モバイル */
            color:#355e80;
            max-width: 1200px;

        }
        .cta-grid h3 { color: #355e80; margin-bottom: 0.75rem; }
        .cta-grid p { color: #355e80; margin-top: .5rem; margin-bottom: 0; font-size: .9rem;}
        .cta-grid a{
            display: inline-block;
            background: #355e80 url(img/btn_arrow.png) no-repeat calc(100% - 7px) calc(100% - 7px);
            color: #eee;
            transition: .6s;
            padding: .5rem 2rem;
            border-radius: 7px;
            text-decoration: none;
            font-weight: 700;
            font-size:1rem;
            line-height: 1.2;
            align-items: center;
            box-sizing: border-box;
        }
        .cta-grid .cta-card2 a{
            padding: .6rem 2rem;
        }
        .cta-grid a:hover {
            background-color: #ffa600;
            background-position: calc(100% - 6px) calc(100% - 6px);
            color:#246;

        }
        /* .cta-card-bg-light { background-color: #f9fafb; } */
        .cta-card-bg-dark { background-color: white; }

        /* 最終CTAのボタン */
        .btn-final-cta {
            background-color: #ec4899; /* pink-500 */
            font-weight: 700;
        }
        .btn-final-cta:hover { background-color: #ffa600; } /* pink-600 */
        .fes-event a img{transition: .3s; box-shadow: #ccc 2px 2px 2px;}
        .fes-event a img:hover{opacity: 0.8; box-shadow: #fff 0 0 0;}


        /* 3列コンテンツブロック */
        .content-grid {
            display: grid;
            gap: 2rem;
            grid-template-columns: 1fr; /* モバイル */
        }
        .content-grid2 {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            justify-content: center;
            margin: 1em auto 2em;
        }

        .content-block-1 h4 { color: #355e80; }
        .content-block-2 {text-align: center;}
        .content-block-2 h4 { color: #355e80; }
        .fes-event img {
            width: 90%;
            height: auto;
            margin:1em auto;
            display: block;
        }
        .content-block-2 img{width: 85%; height: auto; max-width: 360px;}

        /* ------------------------------------- */
        /* 5. 画像と説明文の組み合わせ */
        /* ------------------------------------- */
        .image-text-block {
            display: flex;
            flex-direction: column;
            gap: .5rem;
        }
        /* .image-text-block img {
            width: 100%;
        } */
        .text-lg-content{
            font-size: .9rem;
            font-weight: 400;
            line-height: 1.5;
            padding:1em;
        }
        .text-lg-content li{
            margin-bottom: 1em;
            color:#333;
        }
        .text-lg-content span{
            background-color: #ffff00;
        }
        .content-card img{
            width: 80%;
            clip:rect(25%,0,0,0);
        }
        .card-text{
            text-align: justify;
            font-size: .9rem;
            margin: .5em auto;
            width: 85%;
        }


        /* ------------------------------------- */
        /* 6. アサイド (補足情報) */
        /* ------------------------------------- */
        aside {
            background: #FFFBBF;
            background: linear-gradient(90deg,rgba(255, 251, 191, 1) 15%, rgba(0, 223, 201, 1) 55%, rgba(159, 165, 255, 1) 93%);
            padding: 3rem 0;
        }
        .aside-card {
            background-color: white;
            padding: 2rem;
            border-radius: 0.75rem;
        }
        .aside-content {
            display: flex;
            box-sizing: border-box;
            flex-direction: column;
            /* gap: 2.5rem; */
            color: #355e80;
            justify-content: center;
        }
        .aside-content img {
            width: 100%;
            text-align: center;
        }
        .aside-content h4 img{
            height:auto;
            width: 80%;
            margin-right: 3px;
        }
        .title-supplement{
            font-size:1.3rem;
            font-weight: 700;
            line-height: 1.3;
        }
        /* 2列の関連情報 */
        .aside-info {
            width:100%;
            box-sizing: border-box;
            display: grid;
            gap: 1.5rem;
            grid-template-columns: 1fr; /* モバイル */
        }
        .aside-info > div {
            padding: 1rem;
            display: flex;
            flex-wrap: wrap;
            align-items: flex-start;
            font-size: 1.3rem;
            justify-content: center;
        }
        .aside-info p.label { font-size: 1.3rem; color: #fff; font-weight: 600;background-color: #00b8c9; width: 90%; height:4em;
        line-height: 1.3;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0px 0px 6px #47a;
        text-shadow: #666 1px 1px 3px;
    }
        .aside-info ul.value { margin:0; font-size: 2rem; color: #355e80; font-weight: 700;list-style-type: none; flex-wrap:wrap; padding-inline-start: 20px;}
        .aside-info ul.value li{ color: #355e80; font-weight: 700; margin:.5em 0 0;}
        .aside-info ul.value li span,.aside-info ul.value li i{ font-size:.9rem; margin-right: .7em;}
        .aside-info ul.value li i{ font-style: normal;}
        @media (max-width: 1279px) {
            .aside-info ul.value li span{ display: block; line-height: 1;}
        }


        /* ------------------------------------- */
        /* 7. リストセクション */
        /* ------------------------------------- */
        .list-section-content {
            display: flex;
            flex-direction: column;
            gap: 3rem;
        }
        .list-section-content h2{
            font-size: 2rem;
            line-height: 1;
            text-align: center;
        }
        .list-section-content h2 img{
            display: inline-block;
            height:auto;
            width: 95%;
            margin-right:0;
        }
        .merit-list h3, .portfolio h3 { color: #355e80; margin-bottom: 1.5rem; }
        .merit-list ul {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .merit-list li {
            width: 50%;
            display: flex;
            flex-wrap: wrap;
            align-items: flex-start;
            margin-bottom: 2rem;
            color: #355e80;
            font-size:1rem;
            font-weight: 700;
            line-height: 1.3;
            text-align: center;
            justify-content: center;
        }
        .merit-icon {
            height: 120px;
            width: 120px;
            /* margin-right: 1rem; */
        }
        .merit-list span.title { font-weight: 700; color: #ffa600;font-size: 1.4rem;display: block;margin-bottom: .3em;}
        .portfolio{
            margin-top: 3em;
        }

        .portfolio ul {
            display: grid;
            gap: 1rem;
            list-style: none;
            padding: 0;
            margin: 0;
            grid-template-columns: repeat(1, 1fr); /* モバイル・タブレット (sm:grid-cols-3) */
        }
        .portfolio ul li{
            text-align: center;
        }
        .portfolio img {
            width: 90%;
            height: auto;
            object-fit: cover;
            border-radius: 0.5rem;
            box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
        }
        .portfolio img:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }

        /* ------------------------------------- */
        /* 8. フッター */
        /* ------------------------------------- */
        footer {
            background-color: #355e80;
            color: white;
            padding: 1rem 0;
            text-align: center;
        }

        /* ------------------------------------- */
        /* 9. メディアクエリ (レスポンシブ対応) */
        /* ------------------------------------- */

        /* タブレットサイズ (md: 768px以上) */
        @media (min-width: 768px) {
        .main-visual {
            height: auto;
        }
        .main-visual-text h1 img{
            min-width: 600px;
            height: auto;
        }
        .container {
            width: 100%;
        }
        .sp{
            display:none;
        }
        h2 { font-size: 2.4rem; font-weight: 900; color: #355e80; line-height: 1.2; margin:0;} /* text-4xl 相当 */
        h3 { font-size: 2.4rem; font-weight: 900; color: #355e80;} /* text-3xl 相当 */
        .pc{display:block;}
        .cta-grid {
        gap: 0;
        }
        .cta-grid a{
            padding: 1.5rem 2rem;
            font-size:1.2rem;
            min-width: auto;
        }
        .cta-card, .content-card {
        padding: 2rem 0;
        margin:0;
        }
        .content-card img{
        width: 100%;
        }
        .aside-content h4 img{
            height:2rem;
            width: auto;
            margin-right: 7px;
        }
        .aside-content img {
            width: 100%;
        }
        .list-section-content h2{
            margin:0 0 1.5em;
            font-size: 2rem;
            text-align: left;
        }
        .list-section-content h2 img{
            height:2rem;
            width: auto;
            margin-right: 3px;
        }
            /* グリッド: 2列 */
            .cta-grid, .content-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .aside-info{
                grid-template-columns: repeat(2, 1fr);
                align-items: flex-start;
            }

            /* 画像とテキスト */
            .image-text-block {
                flex-direction: row;
                align-items: flex-start;
                margin-bottom: 2rem;
                /* gap: 3rem; */
            }

            /* .image-text-block > div {
                flex:1;
            } */
            .about-fes h2 img{
                height:2rem;
                width: auto;
            }
            .about-fes h2 span{
                font-size:1rem;
                margin-bottom: 7px;
            }
            .about-fes .fes-event{
                display: flex;
                flex-shrink:1.8;
                flex-direction: column;
                padding-top: 100px;
                box-sizing: border-box;
                gap:1em;
            }
            .fes-event img {
                height: 120px;
                width: auto;
                margin-top:auto;
            }
            .merit-list li {
                font-size:1.6rem;
                text-align: left;
                justify-content: flex-start;
            }
            .merit-list li img{
                margin-right:10px;
            }
            /* アサイド */
                .aside-info p.label { font-size: 1.3rem; color: #fff; font-weight: 600;background-color: #00b8c9; width: 130px; height:130px;
                display: flex;
                align-items: center;
                justify-content: center;
                box-shadow: 0px 0px 6px #47a;
                text-shadow: #666 1px 1px 3px;
            }
            .aside-info ul.value li{ margin-top:.5em;}
            .text-lg-content{
                font-size: 1.3rem;
                font-weight: 500;
            }
            .aside-content .text-lg-content{
                font-size: 1rem;
            }
            .aside-content {
                flex-direction: row;
            }
            .aside-content-img {
                    text-align: center;
            }
            .aside-content img {
                width: 70%; /* md:w-1/3 相当 */
            }
            .aside-content > div {
                flex: 1;
                width: 70%;
                box-sizing: border-box;
            }
            .title-supplement{
            font-size:1.5rem;
            }
            .portfolio ul {
                grid-template-columns: repeat(3, 1fr); /* sm:grid-cols-3 相当 */
            }

            /* ヘッダー */
            #desktop-nav {
                display: flex;
                align-items: center;
                gap: 1em;
            }
            #desktop-nav p{
                text-align: right;
                line-height: 1.3;
                font-size: .8rem;
                margin:auto 0 0;
                color:#333;
            }
            #desktop-nav a{
                line-height: 1;
            }
            #desktop-nav img{
                height: 70px;
                width:auto;
            }
            #desktop-nav a img{
                transition: .3s; box-shadow: #ccc 1px 1px 1px;
            }
            #desktop-nav a img:hover{opacity: 0.8; box-shadow: #fff 0 0 0;
            }
            #mobile-menu-button { display: none; }
        }

        /* デスクトップサイズ (lg: 1024px以上) */
        @media (min-width: 1024px) {
            h1 { font-size: 3.75rem; } /* lg:text-6xl 相当 */

            /* グリッド: 3列 */
            .content-grid {
                max-width: 1280px;
                grid-template-columns: repeat(3, 1fr);
            }
            .content-grid2 {
                max-width: 1280px;
                margin:0 auto;
            }
            .cta-grid {
                grid-template-columns: repeat(3, 1fr);
                margin:0 auto;
            }
            .cta-grid a{
                min-width: 280px;
            }
                .about-fes h2{
                    font-size:2.4em;
                }
                .aside-info ul.value { 
                font-size:3em;
                }
                .about-fes h2 img{
                    height:2.4rem;
                    width: auto;
                    margin-right: 7px;
                }
                .about-fes h2 span,{
                    font-size:1rem;
                    display: block;
                    margin-bottom: 7px;
                }
            .aside-info ul.value li { 
                font-size:1.8rem;
                margin-top: .3em;
            }
            .cta-bg{
                box-shadow: #eee 0 10px 10px;
            }






            /* リストセクション (サービスとポートフォリオを横並びに) */
            .list-section-content {
                flex-direction: row;
                gap: 3rem;
            }
            .merit-list, .portfolio {
                width: 100%; 
            }
        }
    </style>