/* 日本語の写真集詳細ページ専用（styles.css を土台に追加） */

.crumb {
    max-width: 1080px;
    margin: 0 auto;
    padding: 110px clamp(24px, 6vw, 60px) 0;
    font-size: 12px;
    letter-spacing: 0.1em;
    color: var(--muted);
}

.crumb a {
    color: var(--muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.crumb a:hover {
    color: var(--gold);
}

.crumb span {
    margin: 0 8px;
}

.book-detail {
    display: grid;
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
    max-width: 1080px;
    margin: 0 auto;
    padding: clamp(36px, 5vw, 56px) clamp(24px, 6vw, 60px) clamp(60px, 8vw, 100px);
}

.book-detail-cover img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: 0 30px 70px rgba(0, 0, 0, 0.6);
    transition: transform 0.6s ease;
}

.book-detail-cover a:hover img {
    transform: translateY(-6px);
}

.book-detail-body h1 {
    margin: 10px 0 28px;
    font-family: "Shippori Mincho", serif;
    font-size: clamp(26px, 4vw, 38px);
    font-weight: 400;
    letter-spacing: 0.08em;
    line-height: 1.5;
}

.book-facts {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 10px 24px;
    margin: 0 0 28px;
    font-size: 14px;
}

.book-facts dt {
    color: var(--muted);
    letter-spacing: 0.14em;
    white-space: nowrap;
}

.book-facts dd {
    margin: 0;
    color: var(--text);
}

.book-story {
    margin: 0 0 20px;
    font-size: 15px;
    line-height: 2.1;
    color: rgba(245, 241, 230, 0.85);
}

.book-note {
    margin: 0 0 32px;
    font-size: 14px;
    line-height: 2;
    color: var(--muted);
}

@media (max-width: 780px) {
    .crumb {
        padding-top: 96px;
    }

    .book-detail {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }

    .book-detail-cover {
        max-width: 260px;
    }

    .book-facts {
        justify-content: center;
        text-align: left;
    }
}

/* ===== 写真集ビューア（books/<slug>/ と ja/books/<slug>/ 共通） =====
   PC: 見開き＋サムネイル / スマホ: 全ページを縦に並べる。
   ページの縦横比は build.py が --pr（幅÷高さ）として書き込む。 */

.reader {
    --page-h: min(66vh, 760px);
    padding: clamp(40px, 6vw, 72px) 0 clamp(56px, 8vw, 96px);
    background: radial-gradient(circle at top, #26211a 0%, #050505 60%);
    scroll-margin-top: 60px;
}

.reader-head {
    text-align: center;
    margin: 0 0 28px;
    font-size: 11px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--gold);
}

.reader-hint {
    margin: -16px 0 26px;
    text-align: center;
    font-size: 11px;
    letter-spacing: 0.12em;
    color: rgba(245, 241, 230, 0.4);
}

.reader-spread {
    position: relative;
    width: min(calc(var(--page-h) * var(--pr) * 2), 84vw);
    margin: 0 auto;
    --edge-l: 1px;
    --edge-r: 11px;
}

.reader-book {
    filter: drop-shadow(0 34px 50px rgba(0, 0, 0, 0.75));
}

/* 1枚の紙。見開きの内側（綴じ目）に向かって沈む陰影を重ねる */
.reader-leaf {
    background: #f4f1ea;
    overflow: hidden;
}

.reader-leaf img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    user-select: none;
    -webkit-user-drag: none;
}

.reader-leaf::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.reader-leaf.is-left::after {
    background:
        linear-gradient(to left, rgba(0, 0, 0, 0.28), rgba(0, 0, 0, 0.08) 3.5%, transparent 9%),
        linear-gradient(to right, rgba(255, 255, 255, 0.06), transparent 4%);
}

.reader-leaf.is-right::after {
    background:
        linear-gradient(to right, rgba(0, 0, 0, 0.28), rgba(0, 0, 0, 0.08) 3.5%, transparent 9%),
        linear-gradient(to left, rgba(255, 255, 255, 0.06), transparent 4%);
}

/* 小口（本の厚み）。reader.js が残りページ数に合わせて幅と位置を決める */
.reader-edge {
    position: absolute;
    pointer-events: none;
    background: repeating-linear-gradient(to right, #e9e4d8 0 1px, #b9b2a3 1px 2px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.5);
    transition: width 0.4s ease, left 0.4s ease;
}

.reader-edge-left {
    width: var(--edge-l);
    border-radius: 3px 0 0 3px;
}

.reader-edge-right {
    width: var(--edge-r);
    border-radius: 0 3px 3px 0;
}

.reader.is-fallback .reader-spread-wrap { display: none !important; }
.reader.is-fallback .reader-scroll { display: flex !important; }

.reader-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 46px;
    height: 46px;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(215, 188, 117, 0.55);
    color: #f5f1e6;
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    z-index: 4;
}

.reader-nav.prev { left: -66px; }
.reader-nav.next { right: -66px; }
.reader-nav:hover { background: rgba(0, 0, 0, 0.9); }
.reader-nav:disabled { opacity: 0.25; cursor: default; }

.reader-indicator {
    margin: 22px 0 0;
    text-align: center;
    font-size: 12px;
    letter-spacing: 0.2em;
    color: rgba(245, 241, 230, 0.7);
}

.reader-thumbs {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    max-width: min(1100px, 92vw);
    margin: 22px auto 0;
    padding: 4px 2px 10px;
    scrollbar-width: thin;
}

.reader-thumb {
    flex: 0 0 auto;
    padding: 0;
    border: 0;
    background: none;
    opacity: 0.45;
    cursor: pointer;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.reader-thumb img {
    display: block;
    height: 64px;
    width: auto;
    aspect-ratio: var(--pr);
    object-fit: cover;
    border-radius: 3px;
}

.reader-thumb.is-active {
    opacity: 1;
    transform: translateY(-2px);
}

/* スマホ用の縦並び。JS が無くても全ページ読める（クローラもここで画像を拾う） */
.reader-scroll {
    display: flex;
    flex-direction: column;
    gap: 2px;
    max-width: 760px;
    margin: 0 auto;
}

.reader-scroll img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: var(--pr);
    background: #151313;
}

.reader-scroll .is-blank { display: none; }

.reader-spread-wrap { display: none; }

@media (min-width: 901px) {
    :root:not(.no-js) .reader-spread-wrap { display: block; }
    :root:not(.no-js) .reader-scroll { display: none; }
}

@media (max-width: 900px) {
    .reader { padding: 24px 0 48px; background: #0d0d0d; }
}


/* ===== スマホ：今のページ表示・続きから読む・全画面ビューア ===== */
.reader-counter {
    position: fixed;
    right: 14px;
    bottom: calc(16px + env(safe-area-inset-bottom));
    z-index: 60;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(245, 241, 230, 0.9);
    font-size: 11px;
    letter-spacing: 0.15em;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.reader-counter.is-shown { opacity: 1; }

.reader-resume {
    display: block;
    margin: 0 auto 18px;
    padding: 10px 20px;
    border: 1px solid var(--gold-soft);
    border-radius: 999px;
    background: rgba(215, 188, 117, 0.08);
    color: var(--gold);
    font: inherit;
    font-size: 12px;
    letter-spacing: 0.1em;
    cursor: pointer;
}

@media (max-width: 900px) {
    .reader-scroll img { cursor: zoom-in; }
}

@media (min-width: 901px) {
    .reader-counter, .reader-resume { display: none; }
}

.viewer-open, .viewer-open body { overflow: hidden; }

.viewer {
    --drag: 0px;
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0, 0, 0, calc(1 - var(--drag) / 400px));
    opacity: 0;
    transition: opacity 0.25s ease;
    touch-action: none;
}

.viewer.is-open { opacity: 1; }

.viewer-track {
    position: absolute;
    inset: 0;
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    transform: translateY(var(--drag));
    touch-action: pan-x;
}

.viewer-track::-webkit-scrollbar { display: none; }

.viewer-slide {
    flex: 0 0 100%;
    height: 100%;
    display: grid;
    place-items: center;
    scroll-snap-align: center;
    scroll-snap-stop: always;
    overflow: hidden;
}

.viewer-slide img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transform-origin: center;
    will-change: transform;
}

.viewer-count {
    position: absolute;
    left: 0;
    right: 0;
    bottom: calc(18px + env(safe-area-inset-bottom));
    text-align: center;
    font-size: 11px;
    letter-spacing: 0.2em;
    color: rgba(245, 241, 230, 0.75);
    pointer-events: none;
}

.viewer-close {
    position: absolute;
    top: calc(10px + env(safe-area-inset-top));
    right: 10px;
    width: 44px;
    height: 44px;
    border: 0;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.45);
    color: #f5f1e6;
    font-size: 26px;
    line-height: 1;
    cursor: pointer;
}