@charset "utf-8";

/* ===================================================================
   BOOKS（著作）セクション  ― 共通パーツ part/section-books.php 用
   使用ページ: page-aboutus.php / front-page.php
   すべて #hb-books 配下にスコープ。グローバル指定・テーマID衝突なし。
   =================================================================== */

#hb-books {
    --hbb-navy: #17295b;
    --hbb-gray: #6b7280;
    --hbb-line: #e3e7ef;
    --hbb-bg: #f6f8fb;
    --hbb-accent: #c8102e;
    padding: 90px 0 100px;
    background: var(--hbb-bg);
    overflow: hidden;
}

#hb-books .hbb-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- 見出し --- */
#hb-books .hbb-heading {
    margin-bottom: 40px;
}

#hb-books .hbb-heading .hbb-en {
    font-size: 47px;
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: .1em;
    color: var(--hbb-navy);
    margin: 0;
}

#hb-books .hbb-heading .hbb-ja {
    font-size: 15px;
    letter-spacing: .1em;
    color: var(--hbb-gray);
    margin-top: 4px;
}

/* --- 横スクロール書棚 --- */
#hb-books .hbb-shelf-wrap {
    position: relative;
}

#hb-books .hbb-shelf {
    display: flex;
    gap: 28px;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding: 8px 24px 28px;
    margin: 0 auto;
    max-width: 1200px;
    scrollbar-width: thin;
    scrollbar-color: #c3ccdd transparent;
}

#hb-books .hbb-shelf::-webkit-scrollbar {
    height: 6px;
}

#hb-books .hbb-shelf::-webkit-scrollbar-track {
    background: var(--hbb-line);
    border-radius: 999px;
}

#hb-books .hbb-shelf::-webkit-scrollbar-thumb {
    background: #c3ccdd;
    border-radius: 999px;
}

/* 棚板 */
#hb-books .hbb-shelf-board {
    max-width: 1200px;
    margin: -22px auto 0;
    height: 3px;
    background: linear-gradient(90deg, rgba(23, 41, 91, 0) 0%, rgba(23, 41, 91, .18) 8%, rgba(23, 41, 91, .18) 92%, rgba(23, 41, 91, 0) 100%);
}

/* --- 1冊カード --- */
#hb-books .hbb-book {
    flex: 0 0 auto;
    width: 208px;
    scroll-snap-align: start;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

#hb-books .hbb-cover {
    width: 100%;
    aspect-ratio: 3 / 4.4;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    transition: transform .3s ease;
}

#hb-books .hbb-cover img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    display: block;
    box-shadow: 0 10px 22px rgba(23, 41, 91, .16);
    transition: box-shadow .3s ease;
}

#hb-books .hbb-book:hover .hbb-cover,
#hb-books .hbb-book:focus-visible .hbb-cover {
    transform: translateY(-8px);
}

#hb-books .hbb-book:hover .hbb-cover img {
    box-shadow: 0 18px 30px rgba(23, 41, 91, .26);
}

#hb-books .hbb-book:focus-visible {
    outline: 2px solid var(--hbb-navy);
    outline-offset: 4px;
}

#hb-books .hbb-body {
    padding-top: 18px;
    display: flex;
    flex-direction: column;
    flex: 1 1 auto;
}

#hb-books .hbb-title {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.6;
    letter-spacing: .02em;
    color: var(--hbb-navy);
    margin: 0 0 8px;
}

#hb-books .hbb-meta {
    font-size: 12px;
    line-height: 1.7;
    color: var(--hbb-gray);
    margin: 0 0 14px;
    flex: 1 1 auto;
}

#hb-books .hbb-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    align-self: flex-start;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .06em;
    color: var(--hbb-navy);
    border-bottom: 1px solid rgba(23, 41, 91, .3);
    padding-bottom: 3px;
    transition: color .25s ease, border-color .25s ease;
}

#hb-books .hbb-cta::after {
    content: "";
    width: 6px;
    height: 6px;
    border-top: 1px solid currentColor;
    border-right: 1px solid currentColor;
    transform: rotate(45deg);
    transition: transform .25s ease;
}

#hb-books .hbb-book:hover .hbb-cta {
    color: var(--hbb-accent);
    border-color: var(--hbb-accent);
}

#hb-books .hbb-book:hover .hbb-cta::after {
    transform: rotate(45deg) translate(2px, -2px);
}

/* --- レスポンシブ --- */
@media screen and (max-width: 767px) {
    #hb-books {
        padding: 60px 0 70px;
    }

    #hb-books .hbb-inner {
        padding: 0 20px;
    }

    #hb-books .hbb-heading {
        margin-bottom: 32px;
    }

    #hb-books .hbb-heading .hbb-en {
        font-size: 32px;
    }

    #hb-books .hbb-shelf {
        gap: 18px;
        padding: 8px 20px 24px;
    }

    #hb-books .hbb-book {
        width: 152px;
    }

    #hb-books .hbb-title {
        font-size: 13.5px;
    }

}

@media (prefers-reduced-motion: reduce) {

    #hb-books .hbb-cover,
    #hb-books .hbb-cover img,
    #hb-books .hbb-cta,
    #hb-books .hbb-cta::after {
        transition: none;
    }

    #hb-books .hbb-book:hover .hbb-cover {
        transform: none;
    }
}