@charset "UTF-8";

/* ==============================================
   About Page (AI白書について)
=============================================== */
/* --- コンテンツ共通 --- */
.page-content {
    position: relative;
}

/* --- ページ内ナビゲーション --- */
.page-nav {
    position: absolute;
    top:0;
    left:50%;
    background-color: var(--color-primary);
    border-radius: 8px;
    padding: 24px;
    transform: translate(-50%,-50%);
}
.page-nav__title {
    color: var(--color-gold);
    text-align: center;
    margin-bottom: 20px;
}
.page-nav__list {
    display: flex;
    gap: 16px;
    list-style: none;
    padding: 0;
    margin: 0;
}
.page-nav__item {
    flex: 1;
}
.page-nav__link {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-color: var(--color-white);
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 700;
    padding: 8px;
    border-radius: 4px;
    height: 100%;
    transition: opacity 0.2s;
}
.page-nav__link:hover {
    opacity: 0.8;
}
.page-nav__icon {
}

#summary {
    margin-inline: auto;
    padding-inline:16px;
    padding-bottom:clamp(64px, calc(64px + 16 * ((100vw - 375px) / 393)), 80px);
}

/* --- 書籍概要 --- */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(8px, calc(8px + 12 * ((100vw - 375px) / 393)), 20px);
}
.benefits-card {
    text-align: center;
    padding: 16px;
    border-radius: 4px;
    background:var(--color-white);
}
.benefits-card__icon {
    margin:0 auto 12px;
    width: 160px;
}
.benefits-card__title {
    color: var(--color-primary);
    font-weight: 900;
    margin-bottom: clamp(4px, calc(4px + 8 * ((100vw - 375px) / 393)), 12px);
}
.benefits-card__text {
    text-align: left;
    color: var(--color-text-muted);
}
.supervisor-card {
    display: flex;
    gap: 24px;
    background-color: var(--color-white);
    margin-bottom: 40px;
    padding: 40px;
    border-radius: 4px;
}
.supervisor-card__image {
    flex-shrink: 0;
    max-width: 400px;
}
.supervisor-card__name {
    color:var(--color-primary);
    font-weight: 700;
    margin-bottom: 8px;
}
.supervisor-card__role {
    font-weight: 700;
    margin-bottom: 24px;
}
.supervisor-card__history {
    padding:clamp(16px, calc(16px + 8 * ((100vw - 375px) / 393)), 24px);
    background:#F8F8FB;
}
.supervisor-card__history-title {
    color:var(--color-primary);
    font-weight: 700;
    margin-bottom: 6px;
}
.authors-area__lead {
    margin-bottom:16px;
}
.authors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}
.authors-card {
    background-color: var(--color-white);
    padding: 16px;
    border-radius: 4px;
}
.authors-card__name {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 4px;
}

/* --- 販売の新形態 --- */
#sales {
    padding-block:clamp(64px, calc(64px + 16 * ((100vw - 375px) / 393)), 80px);
    background:#fff;
}

.synergy-diagram {
    background-color: var(--color-bg-base);
    margin-bottom:40px;
    padding: 40px;
    text-align: center;
}
.synergy-diagram__title {
    color: var(--color-primary);
    font-weight: 900;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
    width:100%;
}
.synergy-diagram__row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}
.synergy-box {
    padding: 24px;
    background-color: var(--color-white);
    width: 45%;
    border-radius: 8px;
}
.synergy-box--book {
    background-color: var(--color-about-sales01);
}
.synergy-box--digital {
    background-color: var(--color-about-sales02);
}
.synergy-box__header {
    color: #FFFF9F;
    font-weight: 900;
}
.synergy-box--book .synergy-box__header {}
.synergy-box--digital .synergy-box__header {}
.synergy-box__header-wrapper {
    margin-bottom: 16px;
}
.synergy-box__sub {
    font-weight: 700;
    color: var(--color-white);
}
.synergy-box--book .synergy-box__sub {}
.synergy-box--digital .synergy-box__sub {}
.synergy-box__body {
    padding: 16px;
    background:#fff;
}
.synergy-list {
    text-align: left;
    list-style: none;
    padding: 0;
    margin: 0;
}
.synergy-list li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    flex-shrink: 0;
    align-self: stretch;
    margin-bottom: 16px;
}
.synergy-list__title {
    display: flex;
    align-items: center;
    font-weight: 700;
    margin-bottom: 4px;
}
.synergy-box--book .synergy-list__icon, .synergy-box--book .synergy-list__title {
    color: var(--color-about-sales01);
}
.synergy-box--digital .synergy-list__icon, .synergy-box--digital .synergy-list__title {
    color: var(--color-about-sales02);
}
.synergy-list__title .material-symbols-outlined { margin-right: 4px; font-size: 1.2em;}
.synergy-operator {
    font-weight: 900;
}
.synergy-operator__close span {
    font-size: clamp(100px, calc(100px + 60 * ((100vw - 375px) / 393)), 160px);
}
.synergy-operator__equal span {
    font-size: clamp(100px, calc(100px + 20 * ((100vw - 375px) / 393)), 120px);
    transform: rotate(90deg);
}
.synergy-result {
    background: linear-gradient(90deg, #24A2AD 0%, #0F90BF 100%);
    color: var(--color-white);
    padding: 24px;
}
.synergy-result__title { font-weight: 700; color: #FFFF9F; margin-bottom: 8px;}
.synergy-result__text { font-weight: 700; }

.campaign-banner {
    border: 4px solid var(--color-book-main);
    border-radius: 4px;
    text-align: center;
}
.campaign-banner__header {
    background-color: var(--color-book-main);
    color: var(--color-benefit-text);
    font-weight: 900;
    padding: 12px;
}
.campaign-banner__body {
    padding: 40px 24px;
    background:#FFFEF4;
}
.campaign-banner__title {
    color: var(--color-book-main);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 16px;
}
.campaign-banner__title small {
    font-size: 60%;
}
.campaign-banner__text {
    font-weight: 700;
}

/* --- 目次・購入 --- */
#toc {
    padding-block:80px 128px;
}

.product-info {
    display: flex;
    gap: 40px;
}
.product-info__figure { width: 40%; }
.product-info__image { width: 100%; height: auto;}
.product-info__details { width: 60%; }
.product-info__title {
    color: var(--color-primary);
    font-weight: 700;
    margin-bottom: 16px;
}
.product-info__price-box {
    display: flex;
    color: var(--color-white);
    gap:16px;
    margin-bottom: 24px;
}
.product-info__price-label {
    padding:24px;
    background:var(--color-primary);
}
.product-info__price-data {
    color:var(--color-text-base);
    font-weight: 700;
}
.product-info__price-amount {}
.product-info__campaign {
    margin-bottom: 24px;
    padding:24px;
    text-align: center;
    background: var(--color-book-main);
}
.product-info__campaign-badge {
    background: var(--Linear, linear-gradient(90deg, #F5B025 0%, #FFF0C4 50%, #F5B025 100%));
    color: var(--color-book-main);
    font-weight: 900;
    padding: 4px 8px;
}
.product-info__campaign-main {
    background-color: var(--color-book-main);
    color: var(--color-white);
    font-weight: 700;
    padding: 16px;
    line-height: 1.4;
}
.product-info__campaign-sub {
    color: var(--color-white);
    margin-top:8px;
    padding-top: 8px;
    font-weight: 700;
    border-top:1px solid var(--color-benefit-text);
}
.product-spec-wrapper {
    padding:8px 24px;
    width: 100%;
    border:2px solid var(--color-border);
    background:#fff;
}
.product-spec {
    width: 100%;
    border-collapse: collapse;
}
.product-spec th, .product-spec td {
    padding: 16px;
    border-bottom: 1px solid var(--color-border-light);
    text-align: left;
}
.product-spec th { width: 26%; color: var(--color-primary); font-weight: 700;}
.product-spec tr:first-child th, .product-spec tr:first-child td { border-top: none; }
.product-spec tr:last-child th, .product-spec tr:last-child td { border-bottom: none; }

#toc .benefit {
    position: relative;
    bottom: auto;
    left: auto;
    margin-bottom: clamp(48px, calc(48px + 16 * ((100vw - 375px) / 393)), 64px);
    transform: translate(0, 0);
}

.toc-wrapper {
    padding:24px 16px;
    border-radius: 4px;
    background:#fff;
}
.toc-item {
    display: flex;
    border-top: 1px solid var(--color-border);
    padding: 24px 0;
}
.toc-item:first-child {
    padding-top:0;
    border-top: none;
}
.toc-item:last-child { border-bottom: 1px solid var(--color-border); }
.toc-item__left {
    width: 40%;
    padding-right: 20px;
}
.toc-item__badge {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 4px 8px;
    font-weight: 700;
    margin-bottom: clamp(8px, calc(8px + 4 * ((100vw - 375px) / 393)), 12px);
}
.toc-item__title {
    color: var(--color-primary);
    font-weight: 700;
    line-height: 1.4;
}
.toc-item__right { width: 60%; }
.toc-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap:10px;
    padding: 0;
    margin: 0;
}
.toc-list li {
    position: relative;
    padding-left: 12px;
    color:var(--color-primary);
}
.toc-list li::before {
    content: "・";
    position: absolute;
    left: 0;
    color: var(--color-primary);
}
.toc-list li span {
    color:#333;
}

.toc-wrapper.is-collapsed {
    max-height: 420px; 
    overflow: hidden;
    position: relative;
}

/* 下部のフェードアウト用グラデーション */
.toc-wrapper.is-collapsed::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px; /* グラデーションの高さ */
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 1) 100%);
    pointer-events: none;
}

.sample-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.sample-item {
    background-color: #E0E0E0;
    line-height: 0;
}
.sample-item img {
    width:100%;
    height:auto;
}

/* --- バックナンバー --- */
#backnumber {
    padding-top:64px;
    background: var(--color-white);
}
.backnumber-list-wrapper {
    border-top:1px solid var(--color-border);
}
.backnumber-list {
    display: flex;
}
.backnumber-item {
    flex: 1;
    text-align: center;
    padding: 40px 20px;
    border-right: 1px solid var(--color-border);
}
.backnumber-item:first-child { border-left: 1px solid var(--color-border);}
.backnumber-item__figure {
    width: 60%;
    margin: 0 auto 24px;
}
.backnumber-item__figure img { width: 100%; height: auto; box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
.backnumber-item__title {
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 4px;
}
.backnumber-item__badge {
    display: inline-block;
    background-color: var(--color-feature-bg-light);
    color: var(--color-primary);
    padding: 4px 12px;
    font-weight: 700;
    margin-bottom: 16px;
}

/* ==============================================
   Mobile Styles (max-width: 1024px) 用追記
=============================================== */
@media screen and (max-width: 1024px) {
    .page-content {}
    .page-nav {width:calc(100% - 32px);}
    .page-nav__list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px;}

    .about-section {}
    .about-section__body {}

    .benefits-grid { grid-template-columns: 1fr; }
    .benefits-card {
        display: flex;
        align-items: center;
        gap:12px;
    }
    .benefits-card__icon { width: 100px; height:100px; }
    .benefits-card__title-wrapper {flex: 1;}
    .benefits-card__title { text-align: left; }
    .supervisor-card { flex-direction: column; gap: 20px; align-items: center;}
    .supervisor-card__image { width: 100%; }
    .supervisor-card__name, .supervisor-card__role, .supervisor-card__history-title { text-align: center; }
    .authors-area__lead {
        display: flex;
        flex-direction: column;
    }
    .authors-grid { grid-template-columns: 1fr; gap: 8px;}
    
    #sales { padding-inline:16px; }

    .synergy-diagram { padding:40px 16px; }
    .synergy-diagram__row { flex-direction: column; gap: 10px;}
    .synergy-box { width: 100%; }
    
    .campaign-banner__body { padding:16px; }
    
    #toc { padding:64px 16px; }
    #toc .benefit { padding-inline:0; }
    
    .product-info { flex-direction: column; gap: 16px;}
    .product-info__figure { width: 100%; margin: 0 auto;}
    .product-info__details { width: 100%; }
    
    .campaign-step__flow { flex-direction: column; gap: 10px;}
    .campaign-step__arrow {
        border-width: 15px 15px 0 15px;
        border-color: #DCDCDC transparent transparent transparent;
    }

    .toc-item { flex-direction: column; }
    .toc-item__left { width: 100%; padding-right: 0; margin-bottom: 16px;}
    .toc-item__right { width: 100%; }
    
    .toc-wrapper .js-toc-readmore {
        position: relative;
        margin-inline:auto;
        width: 240px;
        z-index: 1;
    }
    .toc-wrapper.is-collapsed .js-toc-readmore {
        position: absolute;
        left:50%;
        bottom:0;
        width: 240px;
        transform: translate(-50%,-24px);
    }

    .sample-grid { grid-template-columns: 1fr 1fr; }

    .backnumber-header { padding-inline:16px; }
    .backnumber-list {
        flex-wrap: wrap;
    }
    .backnumber-item { flex: none; width:50%; border-bottom: 1px solid var(--color-border); padding: 16px 16px 24px;}
    .backnumber-item:nth-child(even) { border-right: 0; }
    .backnumber-item__figure {
        width: 100%;
        margin: 0 auto 24px;
    }
}

@media screen and (min-width: 1025px) {
    .page-nav { margin-inline: auto; }
}

@media screen and (max-width: 1279px) {
    #summary {
        padding-inline: 0;
    }
}