:root {
            --main: #d51717;
            --main2: #8f230e;
            --black: #000000;
            --white: #ffffff;
            --gray: #767676;
            --mute: #f8f8f8;
            --gold: #a57a45;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Noto Sans JP', sans-serif;
            color: var(--black);
            font-size: 16px;
            line-height: 1.8;
            background-color: var(--white);
            word-wrap: break-word;
        }

        @media (min-width: 768px) {
            body {
                font-size: 19px;
            }
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: 'Noto Serif JP', serif;
            font-weight: 700;
            line-height: 1.4;
        }

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

        .text-white {
            color: var(--white);
        }

        .text-gray {
            color: var(--gray);
        }


        .bg-black {
            background-color: var(--black);
        }

        .bg-mute {
            background-color: var(--mute);
        }

        .bg-white {
            background-color: var(--white);
        }

        .container {
            max-width: 1040px;
            margin: 0 auto;
            padding: 0 15px;
        }

        .container-sm {
            max-width: 730px;
            margin: 0 auto;
            padding: 0 15px;
        }

        /* Typography */
        .title-l {
            font-size: 30px;
            text-align: center;
            margin-bottom: 40px;
        }

        @media (min-width: 768px) {
            .title-l {
                font-size: 42px;
            }
        }

        .title-m {
            font-size: 24px;
            text-align: center;
            margin-bottom: 30px;
        }

        @media (min-width: 768px) {
            .title-m {
                font-size: 32px;
            }
        }

        .desc-text {
            text-align: left;
            margin-bottom: 1.5em;
        }

        @media (min-width: 768px) {
            .desc-text {
                text-align: center;
            }
        }

        /* Top Section */
        #top {
            background-color: var(--black);
            text-align: center;
            padding: 15px;
        }

        #top img {
            width: 100%;
            max-width: 700px;
            height: auto;
            display: block;
            margin: 0 auto;
        }

        /* Hero Section */
        #hero {
            position: relative;
            background-image: url('images/hero-bg-s.webp');
            background-size: cover;
            background-position: center top;
            padding: 30px 15px 110px;
            text-align: center;
        }

        @media (min-width: 768px) {
            #hero {
                background-image: url('images/hero-bg-l.webp');
                padding: 30px 15px 150px;
            }
        }

        #hero img {
            width: 100%;
            max-width: 920px;
            height: auto;
            display: block;
            margin: 0 auto;
        }

        /* CTA Sections */
        .cta-section {
            background: linear-gradient(157deg, #d4a972 1.69%, #ddc2a2 50%, #a57a45 98.3%);
            padding: 40px 15px;
            text-align: center;
            position: relative;
            z-index: 2;
            margin-top: -80px;
        }

        @media (min-width: 768px) {
            .cta-section {
                margin-top: -120px;
                padding: 60px 15px;
            }
        }

        .cta-box {
            background-color: transparent;
            max-width: 720px;
            margin: 0 auto;
        }

        .cta-label {
            display: inline-block;
            background-color: var(--black);
            color: var(--white);
            font-family: 'Bayon', sans-serif;
            letter-spacing: 5px;
            padding: 5px 20px;
            font-size: 14px;
            margin-bottom: 20px;
        }

        .cta-title {
            font-size: 24px;
            margin-bottom: 10px;
            color: var(--black);
        }

        .cta-subtitle {
            font-size: 30px;
            color: var(--white);
            font-family: 'Noto Sans JP', sans-serif;
            font-weight: 700;
            margin-bottom: 30px;
        }

        @media (min-width: 768px) {
            .cta-title {
                font-size: 30px;
            }

            .cta-subtitle {
                font-size: 40px;
            }
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-input {
            width: 100%;
            padding: 20px;
            font-size: 18px;
            border: none;
            border-radius: 5px;
            text-align: center;
            box-shadow: inset 0 4px 10px rgba(0, 0, 0, 0.1);
        }

        .form-input::placeholder {
            color: var(--gray);
            font-weight: bold;
        }

        .btn-submit {
            display: block;
            width: 100%;
            background: linear-gradient(to top, #07a53c, #3adcbe);
            color: var(--white);
            font-family: 'Noto Serif JP', serif;
            font-size: 28px;
            font-weight: 700;
            padding: 20px;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            text-decoration: none;
            transition: transform 0.3s, filter 0.3s;
        }

        @media (min-width: 768px) {
            .btn-submit {
                font-size: 32px;
            }
        }

        .btn-submit:hover {
            transform: translateY(-2px);
            filter: brightness(1.1);
        }

        /* Section Spacing */
        .section {
            padding: 60px 0;
        }

        @media (min-width: 768px) {
            .section {
                padding: 100px 0;
            }
        }

        /* Book Section */
        .book-wrap {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 40px;
        }

        @media (min-width: 768px) {
            .book-wrap {
                flex-direction: row;
                justify-content: center;
                align-items: flex-start;
            }

            .book-text {
                flex: 1;
                max-width: 600px;
                text-align: left;
            }

            .book-text .desc-text {
                text-align: left;
            }
        }

        .book-img {
            max-width: 250px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }

        .chip {
            display: inline-block;
            border: 1px solid var(--black);
            padding: 5px 15px;
            font-weight: 700;
            font-size: 16px;
            margin-bottom: 20px;
        }

        .chip-expert {
            font-family: 'Bayon', sans-serif;
            letter-spacing: 5px;
            text-transform: uppercase;
        }

        /* About Images */
        .about-img {
            width: 100%;
            max-width: 700px;
            margin: 40px auto;
            display: block;
        }

        /* Expert Section */
        .expert-wrap {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 40px;
        }

        @media (min-width: 768px) {
            .expert-wrap {
                flex-direction: row;
                max-width: 900px;
                margin: 0 auto;
                align-items: flex-start;
            }

            .expert-text {
                flex: 1;
                text-align: left;
            }

            .expert-text .desc-text {
                text-align: left;
            }
        }

        .expert-img {
            max-width: 280px;
        }

        /* Reasons */
        .reason-list {
            display: flex;
            flex-direction: column;
            gap: 60px;
        }

        .reason-item {
            text-align: left;
            position: relative;
            padding-top: 50px;
        }

        .reason-num {
            font-size: 50px;
            color: var(--main);
            font-family: 'Noto Serif JP', serif;
            font-weight: 700;
            position: absolute;
            top: -20px;
            left: 0;
            line-height: 1;
        }

        @media (min-width: 768px) {
            .reason-item {
                max-width: 800px;
                margin: 0 auto;
                display: flex;
                gap: 40px;
                padding-top: 0;
                align-items: flex-start;
            }

            .reason-num {
                position: static;
                font-size: 60px;
            }

            .reason-content {
                flex: 1;
            }
        }

        .reason-title {
            font-size: 24px;
            margin-bottom: 20px;
            line-height: 1.3;
        }

        @media (min-width: 768px) {
            .reason-title {
                font-size: 28px;
            }
        }

        .line {
            width: 100%;
            height: 1px;
            background: #ddd;
            margin: 40px 0;
        }

        /* Collabo Section */
        #collabo {
            background-color: var(--black);
            color: var(--white);
        }

        #collabo .chip {
            border-color: var(--main);
            color: var(--main);
        }

        .collabo-card {
            border: 1px solid var(--white);
            padding: 30px;
            margin-bottom: 40px;
            display: flex;
            flex-direction: column;
            gap: 30px;
            align-items: center;
        }

        @media (min-width: 768px) {
            .collabo-card {
                flex-direction: row;
                align-items: stretch;
                max-width: 900px;
                margin-left: auto;
                margin-right: auto;
            }

            .collabo-card.reverse {
                flex-direction: row-reverse;
            }
        }

        .collabo-card img {
            width: 100%;
            max-width: 300px;
            object-fit: cover;
        }

        .collabo-text {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .collabo-text h3 {
            margin-bottom: 15px;
            font-size: 24px;
        }

        .collabo-text p {
            color: var(--white);
        }

        /* Reviews */
        .review-card {
            background-color: var(--white);
            border-top: 4px solid var(--main);
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            margin-bottom: 30px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .stars {
            color: var(--main);
            font-size: 20px;
            margin-bottom: 15px;
        }

        .review-card h3 {
            font-size: 22px;
            margin-bottom: 15px;
        }

        .review-card p {
            color: var(--gray);
            margin-bottom: 15px;
        }

        .reviewer {
            text-align: right;
            color: var(--black) !important;
            font-weight: 700;
        }

        /* Recommend */
        .check-list {
            list-style: none;
            max-width: 600px;
            margin: 0 auto;
        }

        .check-list li {
            font-family: 'Noto Serif JP', serif;
            position: relative;
            padding-left: 35px;
            margin-bottom: 20px;
            font-size: 18px;
            font-weight: 700;
        }

        @media (min-width: 768px) {
            .check-list li {
                font-size: 24px;
            }
        }

        .check-list li::before {
            content: '✔';
            color: var(--main);
            position: absolute;
            left: 0;
            top: 0;
            font-size: 22px;
        }

        /* Video wrapper */
        .video-wrap {
            max-width: 800px;
            margin: 0 auto 40px auto;
            position: relative;
            padding-bottom: 56.25%;
            /* 16:9 */
            height: 0;
            background: #000;
        }

        .video-wrap iframe,
        .video-wrap video {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }

        /* Profile */
        .profile-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .profile-content h3 {
            font-size: 26px;
            margin-bottom: 20px;
        }

        .prof-img-wrap {
            text-align: center;
            margin-bottom: 20px;
        }

        .prof-img-wrap img {
            max-width: 250px;
            border-radius: 10px;
        }

        @media (min-width: 768px) {
            .prof-img-wrap {
                float: left;
                margin: 0 30px 20px 0;
            }
        }

        .profile-content p {
            margin-bottom: 15px;
            text-align: left;
        }

        .clear {
            clear: both;
        }

        /* Campaign */
        .campaign-box {
            border: 2px solid var(--main);
            padding: 30px;
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
        }

        .campaign-box img {
            max-width: 100%;
            height: auto;
            margin-top: 20px;
        }

        /* FAQ */
        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            margin-bottom: 40px;
        }

        .faq-q {
            font-family: 'Noto Serif JP', serif;
            font-weight: 700;
            font-size: 20px;
            color: var(--main);
            margin-bottom: 10px;
            display: flex;
            align-items: flex-start;
        }

        .faq-q span {
            display: inline-block;
            width: 30px;
            flex-shrink: 0;
            font-size: 24px;
        }

        .faq-a {
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
        }

        .faq-a span {
            display: inline-block;
            width: 30px;
            flex-shrink: 0;
            color: var(--main);
            font-size: 22px;
        }

        .faq-text {
            padding-left: 30px;
            text-align: left;
        }

        /* Utility */
        .text-center {
            text-align: center;
        }

        .mb-20 {
            margin-bottom: 20px;
        }

        .mb-40 {
            margin-bottom: 40px;
        }

        .mb-60 {
            margin-bottom: 60px;
        }

        .mt-40 {
            margin-top: 40px;
        }

        .font-serif {
            font-family: 'Noto Serif JP', serif;
        }

        .font-sans {
            font-family: 'Noto Sans JP', sans-serif !important;
        }

        .bold {
            font-weight: 700;
        }

        .desktop-only {
            display: none;
        }

        @media (min-width: 768px) {
            .mobile-only {
                display: none;
            }

            .desktop-only {
                display: block;
            }

            #about .desc-text {
                text-align: left;
            }

            .desktop-left {
                text-align: left !important;
            }
        }

        /* Footer */
        #footer {
            background-color: var(--black);
            color: var(--gray);
            text-align: center;
            padding: 20px 15px;
            font-size: 13px;
        }

        #footer a {
            color: var(--gray);
            text-decoration: none;
        }

        #footer a:hover {
            text-decoration: underline;
        }

        .footer-links {
            margin-bottom: 5px;
        }

        .footer-links span {
            margin: 0 10px;
            color: var(--gray);
        }