:root {
            --main-color: #3CA366;
            --sub-color: #f0fdf4;
        }
        body {
            font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
            color: #333;
            background-color: #f8fafc;
            line-height: 1.6;
        }
        .bg-main { background-color: var(--main-color); }
        .text-main { color: var(--main-color); }
        .border-main { border-color: var(--main-color); }
        
        .hero-section {
            background-color: #f8fafc;
            /* 背景画像をスマホ操作を連想させるものに変更 */
            background-image: linear-gradient(rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.3)), url('../images/mv-image-001.png');
            background-size: cover;
            background-position: center 40%;
            border-bottom: 1px solid #edf2f7;
        }
        
        .card-hover:hover {
            transform: translateY(-4px);
            transition: all 0.3s ease;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }

        .search-shadow {
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }

        .section-title {
            font-size: 1.875rem;
            font-weight: 800;
            margin-bottom: 2rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .step-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 100px;
            height: 36px;
            background-color: var(--main-color);
            color: white;
            border-radius: 8px;
            font-size: 18px;
            font-weight: bold;
            margin-bottom: 12px;
        }

        .page-content {
            transition: opacity 0.3s ease;
            opacity: 1; 
        }
        .hidden {
            display: none !important;
        }

        .news-item {
            border-bottom: 1px solid #edf2f7;
            padding: 1.5rem 0;
            transition: background-color 0.2s;
        }
        .news-item:last-child {
            border-bottom: none;
        }
        .news-item:hover {
            background-color: #fcfdfd;
        }

        .tab-btn {
            border-bottom: 4px solid transparent;
            transition: all 0.2s;
        }
        .tab-btn.active {
            border-bottom-color: var(--main-color);
            color: var(--main-color);
            background-color: var(--sub-color);
        }

        #back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: var(--main-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            cursor: pointer;
            box-shadow: 0 4px 10px rgba(0,0,0,0.2);
            transition: all 0.3s ease;
            opacity: 0;
            visibility: hidden;
            z-index: 1000;
        }
        #back-to-top.show {
            opacity: 1;
            visibility: visible;
        }

        /* ----- 立体感を出したボタンカードのスタイル ----- */
        .btn-card {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            background-color: #ffffff;
            border: 2px solid #e5e7eb; /* gray-200 */
            border-radius: 1.25rem;
            padding: 1.5rem;
            text-align: center;
            /* 物理的な厚み（ソリッドな影）と、浮遊感（ぼかした影）を組み合わせる */
            box-shadow: 0 6px 0 #d1d5db, 0 10px 10px -5px rgba(0, 0, 0, 0.08);
            transition: all 0.15s ease-out;
            position: relative;
            overflow: hidden;
            height: calc(100% - 6px); /* 影の分高さを調整 */
            margin-bottom: 6px;
            cursor: pointer;
        }
        
        .btn-card:hover {
            border-color: var(--main-color);
            background-color: #f0fdf4; /* sub-color */
            transform: translateY(-2px);
            /* ホバー時に厚みと浮遊感を増す */
            box-shadow: 0 8px 0 #2a7348, 0 15px 15px -5px rgba(0, 0, 0, 0.12);
        }

        .btn-card:active {
            transform: translateY(4px);
            /* クリック時は沈み込む（厚みを減らす） */
            box-shadow: 0 2px 0 #2a7348, 0 4px 4px -2px rgba(0, 0, 0, 0.1);
        }

        .btn-icon {
            color: var(--main-color);
            margin-bottom: 1rem;
            font-size: 2.5rem;
            transition: transform 0.3s ease;
        }

        .btn-card:hover .btn-icon {
            transform: scale(1.1);
        }

        .btn-text {
            font-weight: 900;
            font-size: 1.125rem; /* lg */
            line-height: 1.4;
            color: #374151; /* gray-700 */
            transition: color 0.3s ease;
        }

        .btn-card:hover .btn-text {
            color: var(--main-color);
        }

        .btn-arrow {
            position: absolute;
            bottom: 1rem;
            right: 1.25rem;
            color: #d1d5db; /* gray-300 */
            font-size: 1.25rem;
            transition: all 0.3s ease;
            opacity: 0;
            transform: translateX(-10px);
        }

        .btn-card:hover .btn-arrow {
            color: var(--main-color);
            opacity: 1;
            transform: translateX(0);
        }

        @media (min-width: 768px) {
            .btn-card { padding: 2rem; }
            .btn-icon { font-size: 3rem; margin-bottom: 1.5rem; }
            .btn-text { font-size: 1.25rem; } /* xl */
        }