body.page-book-product {
    --book-ink: #163f43;
    --book-muted: #5f6c6a;
    --book-paper: #fffdf8;
    --book-wash: #eef4ef;
    --book-accent: #d89143;
    --book-accent-deep: #9f552b;
    --book-line: rgba(22, 63, 67, .16);
    background: var(--book-paper);
    color: var(--book-ink);
}

html.book-reader-active {
    overflow: hidden;
}

body.page-book-product.book-theme-rainbow {
    --book-ink: #253a50;
    --book-muted: #5e6570;
    --book-wash: #f7f0e7;
    --book-accent: #cd5b72;
    --book-accent-deep: #94445d;
    --book-line: rgba(37, 58, 80, .15);
}

body.page-book-product.book-theme-cross {
    --book-ink: #202832;
    --book-muted: #626872;
    --book-wash: #f1efe9;
    --book-accent: #b24335;
    --book-accent-deep: #7f2f2b;
    --book-line: rgba(32, 40, 50, .16);
}

body.page-book-product.book-theme-oracle {
    --book-ink: #2f3a33;
    --book-muted: #626a64;
    --book-wash: #f0f3ea;
    --book-accent: #8e673f;
    --book-accent-deep: #65462d;
    --book-line: rgba(47, 58, 51, .16);
}

body.page-book-product.book-theme-almanac {
    --book-ink: #173d4b;
    --book-muted: #607078;
    --book-wash: #eaf1f0;
    --book-accent: #d9a54f;
    --book-accent-deep: #8d6325;
    --book-line: rgba(23, 61, 75, .16);
}

.page-book-product .site-header:not(.is-scrolled) {
    border-bottom-color: transparent;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
}

.page-book-product .site-header.is-scrolled {
    border-bottom-color: rgba(22, 63, 67, .1);
    background: rgba(255, 253, 248, .9);
    backdrop-filter: blur(18px);
}

.page-book-product .shop-v2 { min-height: 100vh; }
.page-book-product .shop-v2-loading { display: none; }
.book-product { overflow: clip; background: var(--book-paper); }
.book-product *, .book-product *::before, .book-product *::after { box-sizing: border-box; }
.book-product :where(h1, h2, h3, p, ol, figure) { margin-top: 0; }
.book-product :where(h1, h2, h3) { color: var(--book-ink); letter-spacing: -.035em; }
.book-product :where(h1, h2, h3).is-multiline-heading { line-height: 1.4 !important; }
.book-product--rainbow .book-hero-copy h1.is-multiline-heading { line-height: 1.45 !important; }
.book-product :where(p, li) { color: var(--book-muted); }
.book-product :where(a, button, summary):focus-visible { outline: 3px solid color-mix(in srgb, var(--book-accent) 72%, white); outline-offset: 4px; }
.book-product :where(#book-mechanism, #book-toc, #book-preview, #book-delivery) { scroll-margin-top: calc(var(--header-h) + 18px); }

/* HERO 後的完整書型試讀：共用書庫 PDF.js 翻頁器，不另造閱讀元件。 */
.book-pdf-preview {
    padding-block: clamp(48px, 6vw, 88px);
    background:
        radial-gradient(circle at 12% 16%, color-mix(in srgb, var(--book-accent) 16%, transparent), transparent 34%),
        linear-gradient(135deg, #f8f3ea 0%, #e6efec 100%);
}
.book-pdf-preview-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 28px;
    align-items: end;
    margin-bottom: 28px;
}
.book-pdf-preview-head h2 { max-width: 760px; margin-bottom: 12px; }
.book-pdf-preview-head > div:first-child > p:not(.book-kicker) { max-width: 720px; margin: 0; color: rgba(20,63,70,.72); line-height: 1.8; }
.book-pdf-preview-head .book-pdf-preview-note { margin-top: 16px; padding-left: 14px; border-left: 3px solid var(--book-accent); font-size: 14px; }
.book-pdf-preview .report-reader-meta { display: grid; gap: 8px; justify-items: end; }
.book-pdf-preview .report-reader-meta span { color: rgba(20,63,70,.68); font-size: 13px; font-weight: 800; }
.book-pdf-preview .reader-fullscreen-button {
    min-height: 44px;
    margin: 0;
    padding-inline: 19px;
    border-color: rgba(20,63,70,.22);
    color: var(--teal);
    background: rgba(255,255,255,.78);
    box-shadow: 0 10px 24px rgba(8,40,44,.08);
}
.book-pdf-preview .reader-fullscreen-button:hover { background: #fff; }
.book-pdf-preview .report-flipbook-shell { position: relative; width: 100%; }
.book-pdf-preview .reader-fullscreen-toggle { position: absolute; z-index: 12; top: 14px; right: 14px; }
.book-pdf-preview .report-flipbook-stage { background: rgba(188,207,205,.58); }
.book-pdf-preview .report-loading { min-height: min(720px, 72svh); }

@media (max-width: 760px) {
    .book-pdf-preview { padding-block: 42px; }
    .book-pdf-preview-head { grid-template-columns: 1fr; gap: 18px; margin-bottom: 20px; }
    .book-pdf-preview-head h2 { font-size: min(30px, var(--fs-2)); }
    .book-pdf-preview .report-reader-meta { grid-template-columns: auto 1fr; align-items: center; justify-items: start; }
    .book-pdf-preview .reader-fullscreen-button { min-height: 40px; padding-inline: 15px; }
    .book-pdf-preview .report-flipbook-stage { padding: 12px; border-radius: 14px; }
    .book-pdf-preview .report-flip-page { height: min(64svh, 650px); }
}

/* 尺寸與字距來自 site.css 的單一來源；
   顏色是唯一保留的差異——商品頁小標跟著每本書的主題色走。 */
.book-kicker {
    margin-bottom: var(--eyebrow-gap);
    color: var(--book-accent-deep) !important;
    font-size: var(--eyebrow-size);
    font-weight: var(--eyebrow-weight);
    letter-spacing: var(--eyebrow-ls);
    line-height: 1.5;
    text-transform: uppercase;
}

.book-hero {
    position: relative;
    min-height: min(760px, 100svh);
    padding: calc(var(--header-h) + clamp(26px, 5vh, 54px)) 0 26px;
    background:
        radial-gradient(circle at 20% 43%, color-mix(in srgb, var(--book-accent) 16%, transparent) 0, transparent 27%),
        radial-gradient(circle at 85% 18%, rgba(124, 170, 157, .19) 0, transparent 29%),
        linear-gradient(128deg, #fffaf0 0%, var(--book-wash) 100%);
}

.book-product--rainbow .book-hero {
    background:
        linear-gradient(116deg, rgba(215, 74, 92, .08), transparent 25%),
        linear-gradient(242deg, rgba(43, 131, 147, .12), transparent 31%),
        linear-gradient(128deg, #fffaf4 0%, #f3f1f3 100%);
}

.book-product--cross .book-hero {
    background:
        linear-gradient(90deg, transparent 49.8%, rgba(32, 40, 50, .07) 50%, transparent 50.2%),
        linear-gradient(0deg, transparent 49.8%, rgba(178, 67, 53, .08) 50%, transparent 50.2%),
        linear-gradient(132deg, #faf7f0 0%, #ecece8 100%);
}

.book-product--oracle .book-hero {
    background:
        radial-gradient(circle at 10% 30%, rgba(217, 176, 99, .17), transparent 25%),
        radial-gradient(circle at 84% 28%, rgba(74, 111, 102, .16), transparent 28%),
        linear-gradient(132deg, #fbf7ec 0%, #edf1e8 100%);
}

.book-product--almanac .book-hero {
    background:
        radial-gradient(circle at 76% 32%, rgba(217,165,79,.18), transparent 24%),
        repeating-radial-gradient(circle at 19% 51%, transparent 0 88px, rgba(23,61,75,.07) 89px 90px, transparent 91px 132px),
        linear-gradient(132deg, #fbf8ed 0%, #e8f0ef 100%);
}

.book-hero-pattern {
    position: absolute;
    inset: var(--header-h) 0 0;
    pointer-events: none;
    opacity: .5;
}

.book-product--moon .book-hero-pattern {
    background: repeating-radial-gradient(circle at 23% 48%, transparent 0 72px, rgba(22,63,67,.09) 73px 74px, transparent 75px 108px);
}

.book-product--rainbow .book-hero-pattern {
    background: repeating-linear-gradient(163deg, transparent 0 82px, rgba(37,58,80,.055) 83px 84px, transparent 85px 122px);
}

.book-product--cross .book-hero-pattern {
    background: radial-gradient(circle at 72% 46%, transparent 0 138px, rgba(32,40,50,.11) 139px 140px, transparent 141px);
}

.book-product--oracle .book-hero-pattern {
    background: linear-gradient(120deg, transparent 0 24%, rgba(142,103,63,.07) 24.1% 24.3%, transparent 24.4% 72%, rgba(47,58,51,.07) 72.1% 72.3%, transparent 72.4%);
}

.book-product--almanac .book-hero-pattern {
    background: linear-gradient(90deg, transparent 49.94%, rgba(23,61,75,.08) 50%, transparent 50.06%);
}

.book-hero-grid {
    position: relative;
    z-index: 1;
    width: min(100%, 1180px);
    margin-inline: auto;
    display: grid;
    grid-template-columns: minmax(250px, .72fr) minmax(0, 1.28fr);
    gap: clamp(42px, 6vw, 92px);
    align-items: center;
}

.book-cover-stage {
    position: relative;
    width: min(100%, 360px);
    justify-self: center;
    text-align: center;
}

.book-cover-stage img {
    position: relative;
    z-index: 1;
    width: 100%;
    max-height: 570px;
    aspect-ratio: 1240 / 1754;
    display: block;
    object-fit: contain;
    border-radius: 7px;
    background: #f7f0e7;
    box-shadow: 0 32px 75px rgba(36, 47, 43, .22), 18px 18px 0 rgba(255,255,255,.62);
}

.book-cover-stage figcaption {
    margin-top: 20px;
    color: var(--book-muted);
    font-size: 12px;
    letter-spacing: .16em;
}

.book-cover-orbit {
    position: absolute;
    inset: 8% -15% auto;
    aspect-ratio: 1;
    border: 1px solid var(--book-line);
    border-radius: 50%;
}

.book-cover-orbit::before,
.book-cover-orbit::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    background: var(--book-accent);
}

.book-cover-orbit::before { width: 13px; height: 13px; top: 10%; right: 17%; }
.book-cover-orbit::after { width: 8px; height: 8px; left: -4px; top: 50%; }

.book-hero-copy { min-width: 0; }
.book-hero-copy h1 {
    max-width: 850px;
    margin-bottom: 24px;
    font-size: min(var(--title-hero), 40px);
    font-weight: var(--title-hero-weight);
    line-height: var(--title-hero-lh);
    letter-spacing: var(--title-hero-ls);
    text-wrap: balance;
}
.book-product--rainbow .book-hero-copy h1 { font-size: min(var(--title-hero), 36px); }

.book-hero-lead p {
    max-width: 780px;
    margin-bottom: 14px;
    color: var(--book-ink);
    font-size: clamp(17px, 1.25vw, 20px);
    line-height: 1.78;
}

.book-hero-detail { max-width: 780px; border: 0; }
.book-hero-detail summary { width: max-content; display: block; color: var(--book-accent-deep); font-size: 13px; font-weight: 850; cursor: pointer; }
.book-hero-detail p { margin-bottom: 10px; font-size: 15px; line-height: 1.8; }
.book-hero-detail:not([open]) > :not(summary) { display: none; }
.book-hero-detail[open] summary { margin-bottom: 14px; }

.book-scope-chip {
    width: max-content;
    max-width: 100%;
    margin: 0 0 14px;
    padding: 7px 12px;
    border: 1px solid color-mix(in srgb, var(--book-accent) 44%, transparent);
    border-radius: 999px;
    background: color-mix(in srgb, var(--book-accent) 11%, white);
    color: var(--book-accent-deep) !important;
    font-size: 13px;
    font-weight: 900;
    letter-spacing: .05em;
}

.book-hero-actions {
    margin-top: 25px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px 22px;
}

@media (min-width: 621px) {
    .book-product .book-hero-actions { width: 100%; justify-content: space-between; }
    .book-product .book-hero-actions .button { margin-left: auto; }
}

@media (min-width: 1200px) {
    .book-product .book-hero-actions {
        box-sizing: border-box;
        padding-right: clamp(0px, calc(720px - 50vw), 120px);
    }

    .book-product--almanac > :not(.book-hero) > .shell {
        box-sizing: border-box;
        padding-right: clamp(0px, calc(720px - 50vw), 120px);
    }
}

.book-product .button-primary {
    border-color: var(--book-accent);
    background: var(--book-accent);
    color: #fff;
    box-shadow: 0 14px 32px color-mix(in srgb, var(--book-accent) 25%, transparent);
}
.book-product .button-primary:hover { border-color: var(--book-accent-deep); background: var(--book-accent-deep); }
.book-text-link { color: var(--book-ink); font-weight: 800; text-decoration: none; }
.book-text-link span { display: inline-block; margin-left: 5px; transition: transform .2s ease; }
.book-text-link:hover span { transform: translateY(3px); }

.book-status-card {
    align-self: center;
    padding: 22px;
    border: 1px solid rgba(255,255,255,.8);
    border-radius: 20px;
    background: rgba(255,255,255,.75);
    box-shadow: 0 18px 46px rgba(37, 54, 49, .1);
    backdrop-filter: blur(15px);
}
.book-status-label { display: block; margin-bottom: 12px; color: var(--book-muted); font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.book-status-card > strong { display: block; margin-bottom: 8px; color: var(--book-ink); font-size: 20px; }
.book-price { display: block; color: var(--book-accent-deep); font-size: 28px; font-weight: 900; }
.book-status-card > p { margin: 12px 0 0; font-size: 13px; line-height: 1.65; }
.book-status-card > .book-status-offer {
    color: var(--book-accent-deep);
    font-size: 15px;
    line-height: 1.55;
    font-weight: 850;
}
.book-status-card > .book-digital-note {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--book-line);
    color: var(--book-muted);
    font-size: 12px;
    line-height: 1.65;
}
.book-status-actions { margin-top: 20px; }
.book-status-actions .button { width: 100%; }

.oracle-progress { margin-top: 16px; display: grid; gap: 9px; }
.oracle-progress > span { font-size: 13px; color: var(--book-muted); }
.oracle-progress-card { padding: 12px; border: 1px solid var(--book-line); border-radius: 12px; background: rgba(255,255,255,.75); }
.oracle-progress-card strong { display: block; color: var(--book-ink); font-size: 14px; }
.oracle-progress-card span { display: block; margin-top: 3px; color: var(--book-muted); font-size: 12px; }
.oracle-progress-card a { display: inline-flex; margin-top: 8px; color: var(--book-accent-deep); font-size: 12px; font-weight: 850; }

.book-quick-nav {
    position: relative;
    z-index: 2;
    margin-top: 28px;
    display: flex;
    justify-content: center;
    gap: 6px;
}
.book-quick-nav a { min-width: 116px; padding: 10px 16px; border-bottom: 1px solid var(--book-line); color: var(--book-muted); font-size: 13px; font-weight: 750; text-align: center; text-decoration: none; }
.book-quick-nav a:hover { border-color: var(--book-accent); color: var(--book-accent-deep); }

.book-after-preview {
    padding: clamp(34px, 5vw, 68px) 0 clamp(50px, 7vw, 90px);
    border-bottom: 1px solid var(--book-line);
    background: var(--book-paper);
}

.book-after-preview-grid {
    display: grid;
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: clamp(24px, 4vw, 60px);
    align-items: start;
}

.book-after-preview .book-status-card {
    width: 100%;
    background: color-mix(in srgb, var(--book-wash) 72%, white);
    box-shadow: 0 18px 44px rgba(37, 54, 49, .08);
}

.book-after-preview-detail {
    width: 100%;
    max-width: none;
    padding: 22px 24px;
    border: 1px solid var(--book-line);
    border-radius: 20px;
    background: rgba(255, 255, 255, .68);
}

.book-after-preview-detail summary {
    font-size: 16px;
}

.book-full-introduction {
    border-bottom: 1px solid var(--book-line);
    background: var(--book-paper);
}

.book-full-introduction-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(26px, 5vw, 72px);
    align-items: start;
}

.book-full-introduction-scene {
    padding: clamp(24px, 3.5vw, 42px);
    border: 1px solid var(--book-line);
    border-radius: 22px;
    background: var(--book-wash);
}

.book-full-introduction-scene > p:last-child,
.book-full-introduction-closing > p:last-child {
    margin-bottom: 0;
}

.book-full-introduction-principles {
    margin-top: clamp(42px, 7vw, 82px);
}

.book-full-introduction-four-card-grid { gap: 22px; align-items: stretch; }
.book-full-introduction-four-card-grid > .book-full-introduction-card {
    max-width: none;
    margin: 0;
    padding: clamp(30px, 4vw, 56px);
    border: 1px solid var(--book-line);
    border-radius: 24px;
    background: #fff;
}
.book-full-introduction-four-card-grid > .book-full-introduction-card:nth-child(even) { background: var(--book-wash); }
.book-full-introduction-principle-card h3 {
    margin-bottom: 24px;
    font-size: min(var(--title-section), 40px);
    font-weight: var(--title-section-weight);
    line-height: var(--title-section-lh);
    letter-spacing: var(--title-section-ls);
}
.book-full-introduction-principle-card p:not(.book-kicker) { margin-bottom: 12px; font-size: 15px; line-height: 1.8; }

.book-full-introduction-closing {
    margin-top: clamp(24px, 4vw, 48px);
    padding: clamp(30px, 5vw, 64px);
    border-radius: 24px;
    background: var(--book-ink);
}

.book-full-introduction-closing h3 {
    max-width: 900px;
    margin: 0 0 18px;
    color: #fff;
    font-size: min(var(--title-section), 40px);
    font-weight: var(--title-section-weight);
    line-height: var(--title-section-lh);
    letter-spacing: var(--title-section-ls);
}

.book-full-introduction-closing > p:last-child {
    max-width: 820px;
    color: rgba(255,255,255,.72);
    font-size: 17px;
    line-height: 1.85;
}

.book-section { padding: clamp(72px, 9vw, 132px) 0; }
.book-reading-grid { display: grid; grid-template-columns: minmax(280px, .72fr) minmax(0, 1.28fr); gap: clamp(42px, 8vw, 138px); align-items: start; }
.book-section-heading h2 { max-width: 720px; margin-bottom: 20px; font-size: min(var(--title-section), 40px); font-weight: var(--title-section-weight); line-height: var(--title-section-lh); letter-spacing: var(--title-section-ls); text-wrap: balance; }
.book-section-heading > p:not(.book-kicker) { max-width: 680px; font-size: 16px; line-height: 1.8; }
.book-section-heading--center { max-width: 820px; margin: 0 auto 48px; text-align: center; }
.book-section-heading--center h2 { margin-inline: auto; }
.book-prose { max-width: 760px; padding-top: 7px; }
.book-prose p { margin-bottom: 22px; font-size: clamp(17px, 1.45vw, 21px); line-height: 1.95; }

.book-scene { background: var(--book-paper); }
.book-mechanism { position: relative; background: var(--book-ink); }
.book-mechanism :where(h2, h3) { color: #fff; }
.book-mechanism .book-kicker { color: color-mix(in srgb, var(--book-accent) 75%, white) !important; }
.book-mechanism-map { position: relative; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; list-style: none; }
.book-mechanism-map::before { content: ""; position: absolute; top: 39px; left: 10%; right: 10%; height: 1px; background: rgba(255,255,255,.2); }
.book-mechanism-map li { position: relative; z-index: 1; min-height: 270px; padding: 26px 22px; border: 1px solid rgba(255,255,255,.13); border-radius: 22px; background: rgba(255,255,255,.055); }
.book-mechanism-index { width: 28px; height: 28px; display: grid; place-items: center; margin-bottom: 30px; border-radius: 50%; background: var(--book-accent); color: #fff; font-size: 10px; font-weight: 900; }
.book-mechanism-map small { color: rgba(255,255,255,.58); font-size: 10px; font-weight: 850; letter-spacing: .15em; }
.book-mechanism-map h3 { margin: 8px 0 12px; font-size: 21px; }
.book-mechanism-map p { margin: 0; color: rgba(255,255,255,.72); font-size: 14px; line-height: 1.75; }

.book-product--rainbow .book-mechanism-map li:nth-child(odd) { transform: translateY(-12px); }
.book-product--rainbow .book-mechanism-map li:nth-child(even) { transform: translateY(12px); }
.book-product--moon .book-mechanism-map li:nth-child(odd) { transform: translateY(-12px); }
.book-product--moon .book-mechanism-map li:nth-child(even) { transform: translateY(12px); }
.book-product--cross .book-mechanism-map { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 900px; margin-inline: auto; }
.book-product--cross .book-mechanism-map::before { inset: 50% 20% auto; }
.book-product--cross .book-mechanism-map li { min-height: 210px; }
.book-product--oracle .book-mechanism-map li:last-child { border-color: color-mix(in srgb, var(--book-accent) 70%, white); background: color-mix(in srgb, var(--book-accent) 24%, transparent); }

.book-questions { background: #faf6ed; }
.book-questions ol { margin: 0; padding: 0; list-style: none; counter-reset: questions; }
.book-questions li { position: relative; padding: 17px 16px 17px 58px; border-bottom: 1px solid var(--book-line); font-size: 16px; line-height: 1.65; }
.book-questions li::before { content: counter(questions, decimal-leading-zero); counter-increment: questions; position: absolute; top: 18px; left: 10px; color: var(--book-accent-deep); font-size: 11px; font-weight: 900; }

.book-content-proof { background: var(--book-wash); }
.book-proof-grid { display: grid; grid-template-columns: minmax(260px, .65fr) minmax(0, 1.35fr); gap: clamp(42px, 8vw, 130px); align-items: start; }
.book-toc-intro h2 { margin-bottom: 20px; font-size: min(var(--title-section), 40px); font-weight: var(--title-section-weight); line-height: var(--title-section-lh); }
.book-toc-intro > p:not(.book-kicker) { max-width: 520px; font-size: 16px; line-height: 1.8; }
.book-toc { border: 0; }
.book-toc summary { padding: 0 0 17px; display: flex; justify-content: space-between; gap: 20px; border-bottom: 2px solid var(--book-ink); color: var(--book-ink); font-size: 13px; font-weight: 900; cursor: pointer; list-style: none; }
.book-toc summary::-webkit-details-marker { display: none; }
.book-toc summary span:last-child { color: var(--book-accent-deep); }
.book-toc ol { margin: 0; padding: 0; list-style: none; counter-reset: toc; }
.book-toc li { position: relative; padding: 16px 48px 16px 52px; border-bottom: 1px solid var(--book-line); color: var(--book-ink); font-size: 16px; line-height: 1.5; }
.book-toc li::before { content: counter(toc, decimal-leading-zero); counter-increment: toc; position: absolute; left: 8px; color: var(--book-accent-deep); font-size: 11px; font-weight: 900; }

.book-preview { background: #131b1c; }
.book-preview :where(h2) { color: #fff; }
.book-preview .book-kicker { color: color-mix(in srgb, var(--book-accent) 70%, white) !important; }
.book-preview-heading { margin-bottom: 38px; display: flex; justify-content: space-between; gap: 40px; align-items: end; }
.book-preview-heading h2 { margin-bottom: 0; }
.book-preview-heading > p { max-width: 390px; margin-bottom: 4px; color: rgba(255,255,255,.64); font-size: 14px; line-height: 1.75; }
.book-preview-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.book-preview-card { min-width: 0; }
.book-preview-card a { position: relative; aspect-ratio: 560 / 792; display: block; overflow: hidden; border-radius: 10px; background: #eee7db; text-decoration: none; }
.book-preview-card picture, .book-preview-card img { width: 100%; height: 100%; display: block; }
.book-preview-card img { object-fit: contain; transition: transform .3s ease; }
.book-preview-card a:hover img { transform: scale(1.025); }
.book-preview-card a > span { position: absolute; right: 10px; bottom: 10px; padding: 7px 10px; border-radius: 99px; background: rgba(16,27,28,.78); color: #fff; font-size: 11px; font-weight: 800; backdrop-filter: blur(6px); }
.book-preview-card figcaption { padding: 15px 3px 0; color: rgba(255,255,255,.58); font-size: 13px; line-height: 1.65; }
.book-preview-card figcaption strong { display: block; margin-bottom: 4px; color: #fff; font-size: 15px; }

.book-version-note {
    margin: 0 0 34px;
    padding: 24px 28px;
    border: 1px solid rgba(255,255,255,.16);
    border-left: 4px solid var(--book-accent);
    border-radius: 3px 18px 18px 3px;
    background: rgba(255,255,255,.06);
}

.book-version-note .book-kicker { margin-bottom: 7px; }
.book-version-note strong { display: block; color: #fff; font-size: clamp(18px, 2vw, 24px); line-height: 1.4; }
.book-version-note > p:last-child { max-width: 980px; margin: 10px 0 0; color: rgba(255,255,255,.67); font-size: 14px; line-height: 1.8; }

.book-reader-launch {
    scroll-margin-top: calc(var(--header-h) + 18px);
    margin-top: 46px;
    padding: clamp(26px, 4vw, 48px);
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(240px, .55fr);
    gap: 34px;
    align-items: center;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.13);
    border-radius: 24px;
    background: linear-gradient(128deg, rgba(255,255,255,.075), rgba(255,255,255,.025));
}

.book-reader-launch h3 {
    max-width: 760px;
    margin: 0 0 14px;
    color: #fff;
    font-size: clamp(30px, 2.6vw, 38px);
    line-height: 1.17;
}

.book-reader-launch p:not(.book-kicker) {
    max-width: 720px;
    margin: 0 0 23px;
    color: rgba(255,255,255,.66);
    font-size: 14px;
    line-height: 1.8;
}

.book-reader-stack {
    position: relative;
    min-height: 280px;
}

.book-reader-stack img {
    position: absolute;
    top: 0;
    left: 0;
    width: min(68%, 190px);
    aspect-ratio: 560 / 792;
    display: block;
    object-fit: contain;
    border-radius: 5px;
    background: #fff;
    box-shadow: 0 18px 42px rgba(0,0,0,.32);
    transform: rotate(-4deg);
}

.book-reader-stack img:nth-child(2) { top: 12px; left: 20px; transform: rotate(0); }
.book-reader-stack img:nth-child(3) { top: 24px; left: 40px; transform: rotate(4deg); }

.book-reader-dialog {
    width: 100vw;
    max-width: none;
    height: 100svh;
    height: 100dvh;
    max-height: none;
    margin: 0;
    padding: 0;
    border: 0;
    background: #0e1719;
    color: #fff;
}

.book-reader-dialog::backdrop { background: rgba(4,10,11,.88); }

.book-reader-shell {
    --reader-toolbar-h: 72px;
    width: 100%;
    height: 100%;
    display: grid;
    grid-template-rows: auto minmax(0,1fr) auto;
    overflow: hidden;
    background: #0e1719;
}

.book-reader-shell:fullscreen {
    width: 100vw;
    height: 100vh;
}

.book-reader-toolbar,
.book-reader-viewport,
.book-reader-canvas,
.book-reader-footer {
    min-width: 0;
}

.book-reader-toolbar {
    min-height: var(--reader-toolbar-h);
    padding: 11px 18px;
    display: flex;
    gap: 20px;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255,255,255,.11);
    background: rgba(14,23,25,.96);
}

.book-reader-toolbar p,
.book-reader-toolbar h2 { margin: 0; }
.book-reader-toolbar p { color: color-mix(in srgb, var(--book-accent) 75%, white); font-size: 10px; font-weight: 850; letter-spacing: .09em; }
.book-reader-toolbar h2 { margin-top: 3px; color: #fff; font-size: clamp(16px, 2vw, 22px); line-height: 1.2; }

.book-reader-tools {
    flex: 0 0 auto;
    display: flex;
    gap: 6px;
}

.book-reader-tools button,
.book-reader-arrow {
    display: grid;
    place-items: center;
    border: 1px solid rgba(255,255,255,.16);
    color: #fff;
    background: rgba(255,255,255,.08);
    font: inherit;
    cursor: pointer;
}

.book-reader-tools button {
    min-width: 40px;
    height: 40px;
    padding: 0 9px;
    border-radius: 10px;
}

.book-reader-tools button:hover,
.book-reader-arrow:hover:not(:disabled) { border-color: var(--book-accent); background: color-mix(in srgb, var(--book-accent) 22%, transparent); }
.book-reader-tools button:disabled,
.book-reader-arrow:disabled { cursor: not-allowed; opacity: .3; }

.book-reader-viewport {
    position: relative;
    min-height: 0;
    display: grid;
    grid-template-columns: 62px minmax(0,1fr) 62px;
    align-items: center;
    background:
        radial-gradient(circle at 50% 46%, rgba(255,255,255,.08), transparent 34%),
        #111c1e;
}

.book-reader-arrow {
    z-index: 2;
    width: 46px;
    height: 46px;
    justify-self: center;
    border-radius: 50%;
    font-size: 18px;
}

.book-reader-canvas {
    width: 100%;
    height: 100%;
    min-height: 0;
    display: grid;
    place-items: center;
    overflow: auto;
    padding: 14px;
    overscroll-behavior: contain;
    touch-action: pan-y pinch-zoom;
}

.book-reader-canvas picture { display: contents; }
.book-reader-canvas img {
    width: auto;
    max-width: 100%;
    height: min(65vh, 760px);
    max-height: 100%;
    display: block;
    object-fit: contain;
    background: #fff;
    box-shadow: 0 18px 52px rgba(0,0,0,.34);
}

.book-reader-canvas.is-zoomed {
    display: block;
}

.book-reader-canvas.is-zoomed picture { display: block; }
.book-reader-canvas.is-zoomed img { height: auto; max-width: none; max-height: none; margin-inline: auto; }

.book-reader-footer {
    padding: 10px 18px 12px;
    border-top: 1px solid rgba(255,255,255,.11);
    background: rgba(14,23,25,.98);
}

.book-reader-footer > p {
    margin: 0 0 8px;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    color: rgba(255,255,255,.7);
    font-size: 12px;
}

.book-reader-footer > p strong { color: #fff; }
.book-reader-footer > small { display: block; margin-top: 7px; color: rgba(255,255,255,.43); font-size: 10px; text-align: center; }

.book-reader-thumbs {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 2px 2px 5px;
    scrollbar-width: thin;
}

.book-reader-thumbs button {
    position: relative;
    flex: 0 0 54px;
    height: 70px;
    padding: 2px;
    overflow: hidden;
    border: 2px solid transparent;
    border-radius: 5px;
    background: #fff;
    cursor: pointer;
    opacity: .55;
}

.book-reader-thumbs button.is-active { border-color: var(--book-accent); opacity: 1; }
.book-reader-thumbs picture,
.book-reader-thumbs img { width: 100%; height: 100%; display: block; }
.book-reader-thumbs img { object-fit: cover; }
.book-reader-thumbs button > span { position: absolute; right: 3px; bottom: 3px; min-width: 18px; padding: 2px 4px; border-radius: 99px; color: #fff; background: rgba(9,20,22,.76); font-size: 8px; }

.book-deliverables { background: var(--book-paper); }
.book-report-contents { background: var(--book-paper); }
.book-deliverable-list { margin: 0; padding: 0; list-style: none; }
.book-deliverable-list li { display: grid; grid-template-columns: 42px minmax(0,1fr); gap: 18px; align-items: start; padding: 20px 0; border-bottom: 1px solid var(--book-line); }
.book-deliverable-list span { color: var(--book-accent-deep); font-size: 11px; font-weight: 900; }
.book-deliverable-list p { margin: 0; color: var(--book-ink); font-size: clamp(17px, 1.5vw, 21px); line-height: 1.55; }

.book-principles { padding-top: 0; background: var(--book-paper); }
.book-principle-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 22px; }
.book-principle-grid article { padding: clamp(30px, 4vw, 56px); border: 1px solid var(--book-line); border-radius: 24px; background: #fff; }
.book-principle-grid article:nth-child(2) { background: var(--book-wash); }
.book-principle-grid :is(h2, h3) { margin-bottom: 24px; font-size: min(var(--title-section), 40px); font-weight: var(--title-section-weight); line-height: var(--title-section-lh); letter-spacing: var(--title-section-ls); }
.book-principle-grid p:not(.book-kicker) { margin-bottom: 12px; font-size: 15px; line-height: 1.8; }

.book-report-questions {
    margin-top: clamp(42px, 6vw, 70px);
    padding-top: clamp(34px, 5vw, 56px);
    border-top: 1px solid var(--book-line);
    background: transparent;
}

.book-report-questions .book-section-heading h3 {
    margin-bottom: 20px;
    color: var(--book-ink);
    font-size: min(var(--title-section), 32px);
    font-weight: var(--title-section-weight);
    line-height: var(--title-section-lh);
    letter-spacing: var(--title-section-ls);
}

.book-report-questions--wide { width: 100%; }
.book-report-questions--wide .book-section-heading { max-width: 820px; }
.book-report-questions--wide ol {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 44px;
}
.book-report-questions--wide li { font-size: 16px; line-height: 1.7; }

.book-purchase {
    padding-block: clamp(28px, 3vw, 44px);
    border-top: 1px solid var(--book-line);
    background: color-mix(in srgb, var(--book-wash) 72%, var(--book-paper));
}

.book-purchase-bar {
    display: grid;
    grid-template-columns: minmax(220px, .85fr) minmax(360px, 1.5fr) auto;
    gap: clamp(24px, 3vw, 56px);
    align-items: center;
}

.book-purchase-plan > strong {
    display: block;
    margin-bottom: 4px;
    color: var(--book-ink);
    font-size: 13px;
    font-weight: 850;
    letter-spacing: .08em;
}

.book-purchase-plan .book-price { font-size: clamp(22px, 2.2vw, 28px); }
.book-purchase-facts { display: grid; gap: 4px; }
.book-purchase .book-purchase-fact {
    margin: 0;
    color: var(--book-muted);
    font-size: 14px;
    line-height: 1.65;
}
.book-purchase-actions { justify-self: end; }
.book-purchase-actions .button { width: auto; min-width: 174px; white-space: nowrap; }

.book-scope { padding-block: 0 clamp(72px, 9vw, 132px); background: var(--book-paper); }
.book-scope-card { position: relative; overflow: hidden; padding: clamp(34px, 5vw, 70px); border-left: 5px solid var(--book-accent); border-radius: 3px 24px 24px 3px; background: var(--book-ink); }
.book-scope-card::after { content: ""; position: absolute; width: 260px; height: 260px; right: -80px; bottom: -150px; border: 1px solid rgba(255,255,255,.14); border-radius: 50%; }
.book-scope-card h2 { max-width: 900px; margin-bottom: 18px; color: #fff; font-size: min(var(--title-section), 40px); font-weight: var(--title-section-weight); line-height: var(--title-section-lh); letter-spacing: var(--title-section-ls); }
.book-scope-card > p:last-child { max-width: 930px; margin: 0; color: rgba(255,255,255,.72); font-size: 17px; line-height: 1.85; }

.book-validation { background: var(--book-wash); }
.book-validation-short { margin: 0; color: var(--book-accent-deep); font-size: clamp(18px, 2.3vw, 28px); font-weight: 900; line-height: 1.5; text-align: center; }
.book-proof-stat { display: grid; grid-template-columns: auto 1fr; gap: 10px 18px; align-items: baseline; }
.book-proof-stat strong { color: var(--book-accent-deep); font-size: clamp(38px, 4vw, 40px); line-height: 1; }
.book-proof-stat span { color: var(--book-ink); font-size: 14px; font-weight: 800; }
.book-proof-stat p { grid-column: 1 / -1; margin: 18px 0 0; font-size: 15px; line-height: 1.8; }

.book-delivery { background: var(--book-paper); }
.book-delivery-steps { margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; list-style: none; }
.book-delivery-steps li { padding: 28px; border-top: 3px solid var(--book-accent); background: var(--book-wash); }
.book-delivery-steps span { color: var(--book-accent-deep); font-size: 11px; font-weight: 900; }
.book-delivery-steps h3 { margin: 22px 0 10px; font-size: 21px; }
.book-delivery-steps p { margin: 0; font-size: 14px; line-height: 1.75; }
.book-mid-cta { margin-top: 36px; text-align: center; }

.book-faq { border-top: 1px solid var(--book-line); background: var(--book-paper); }
.book-faq-list details { border-bottom: 1px solid var(--book-line); }
.book-faq-list summary { position: relative; padding: 20px 46px 20px 4px; color: var(--book-ink); font-size: 17px; font-weight: 850; line-height: 1.5; cursor: pointer; list-style: none; }
.book-faq-list summary::-webkit-details-marker { display: none; }
.book-faq-list summary::after { content: "+"; position: absolute; top: 17px; right: 8px; color: var(--book-accent-deep); font-size: 25px; font-weight: 400; }
.book-faq-list details[open] summary::after { content: "−"; }
.book-faq-list details p { max-width: 720px; margin: 0; padding: 0 46px 24px 4px; font-size: 15px; line-height: 1.8; }

.book-final { padding: clamp(82px, 11vw, 160px) 0; background: var(--book-ink); text-align: center; }
.book-final h2 { max-width: 1000px; margin: 0 auto 24px; color: #fff; font-size: min(var(--title-section), 40px); font-weight: var(--title-section-weight); line-height: var(--title-section-lh); letter-spacing: var(--title-section-ls); text-wrap: balance; }
.book-final > .shell > p:not(.book-kicker) { max-width: 780px; margin: 0 auto 31px; color: rgba(255,255,255,.7); font-size: 17px; line-height: 1.85; }

/* 年度星曆沿用新版商品頁的段落節奏，但保留日期索引、時間窗與取得內容。 */
.book-product--almanac .book-pdf-preview-disclaimer {
    margin-top: 12px !important;
    color: rgba(20, 63, 70, .58) !important;
    font-size: 13px;
    line-height: 1.7;
}

.book-product--almanac .book-section:not(.book-pdf-preview) {
    padding-block: clamp(64px, 7vw, 104px);
}

.book-product--almanac .book-almanac-introduction {
    border-bottom: 1px solid var(--book-line);
    background: var(--book-paper);
}

.book-product--almanac .book-almanac-quick-nav {
    margin: 0 0 clamp(42px, 6vw, 70px);
    flex-wrap: wrap;
}

.book-product--almanac .book-full-introduction-four-card-grid > .book-full-introduction-card {
    min-height: 100%;
}

.book-product--almanac .book-full-introduction-four-card-grid .book-prose p,
.book-product--almanac .book-full-introduction-principle-card p:not(.book-kicker) {
    font-size: 16px;
    line-height: 1.82;
}

.book-product--almanac .book-almanac-contents {
    background: var(--book-wash);
}

.book-product--almanac .book-almanac-contents .book-deliverable-list li {
    padding: 20px 0;
}

.book-product--almanac .book-scope {
    padding-block: 0 clamp(64px, 7vw, 104px);
    background: var(--book-wash);
}

.book-product--almanac .book-delivery {
    background: var(--book-paper);
}

.book-almanac-offer {
    margin-bottom: 24px;
    padding: clamp(24px, 3vw, 34px);
    display: grid;
    grid-template-columns: minmax(210px, .8fr) minmax(300px, 1.35fr) auto;
    gap: clamp(22px, 3vw, 46px);
    align-items: center;
    border: 1px solid var(--book-line);
    border-radius: 24px;
    background: color-mix(in srgb, var(--book-wash) 72%, white);
}

.book-almanac-offer-state > strong {
    display: block;
    margin-bottom: 6px;
    color: var(--book-ink);
    font-size: 20px;
    line-height: 1.45;
}

.book-almanac-offer-state .book-price {
    font-size: clamp(22px, 2.2vw, 28px);
}

.book-almanac-offer-copy p {
    margin: 0;
    color: var(--book-muted);
    font-size: 14px;
    line-height: 1.7;
}

.book-almanac-offer-copy .book-status-offer {
    margin-bottom: 5px;
    color: var(--book-accent-deep);
    font-size: 15px;
    font-weight: 850;
}

.book-almanac-offer-action { justify-self: end; }
.book-almanac-offer-action .button { min-width: 174px; white-space: nowrap; }

.book-product--almanac .book-version-note {
    margin-bottom: 24px;
    padding: clamp(24px, 3vw, 34px);
    border: 1px solid color-mix(in srgb, var(--book-accent) 35%, var(--book-line));
    border-left: 5px solid var(--book-accent);
    border-radius: 4px 24px 24px 4px;
    background: var(--book-ink);
}

.book-product--almanac .book-delivery-steps { gap: 16px; }
.book-product--almanac .book-delivery-steps li {
    min-height: 220px;
    padding: 28px;
    border: 1px solid var(--book-line);
    border-radius: 22px;
    background: #fff;
}

.book-product--almanac .book-delivery-steps span {
    width: 30px;
    height: 30px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: color-mix(in srgb, var(--book-accent) 20%, white);
    color: var(--book-accent-deep);
}

.book-product--almanac .book-delivery-steps h3 { margin: 22px 0 10px; }

.book-product--almanac .book-faq {
    border-top: 0;
    background: var(--book-wash);
}

.book-product--almanac .book-faq-list {
    display: grid;
    gap: 12px;
}

.book-product--almanac .book-faq-list details {
    overflow: hidden;
    border: 1px solid var(--book-line);
    border-radius: 18px;
    background: rgba(255, 255, 255, .82);
}

.book-product--almanac .book-faq-list summary { padding-inline: 20px 54px; }
.book-product--almanac .book-faq-list details p { padding-inline: 20px 54px; }

.book-product--almanac .book-final {
    padding-block: clamp(70px, 8vw, 112px);
}

.book-lightbox { width: min(92vw, 900px); max-height: 92vh; padding: 56px 20px 20px; border: 0; border-radius: 18px; background: #1c2222; color: #fff; box-shadow: 0 30px 100px rgba(0,0,0,.5); }
.book-lightbox::backdrop { background: rgba(8,12,12,.78); backdrop-filter: blur(6px); }
.book-lightbox > button { position: absolute; top: 10px; right: 12px; width: 38px; height: 38px; border: 0; border-radius: 50%; background: rgba(255,255,255,.1); color: #fff; font-size: 28px; cursor: pointer; }
.book-lightbox h2 { margin: 0 54px 14px 0; color: #fff; font-size: 18px; }
.book-lightbox img { width: 100%; max-height: calc(92vh - 110px); display: block; object-fit: contain; }

@media (max-height: 780px) and (min-width: 981px) {
    .book-hero { min-height: min(690px, 100svh); padding-top: calc(var(--header-h) + 14px); }
    .book-cover-stage { max-width: 275px; }
    .book-cover-stage img { max-height: 430px; }
    .book-cover-stage figcaption { margin-top: 10px; }
    .book-hero-copy h1 { margin-bottom: 14px; font-size: clamp(38px, 3vw, 40px); }
    .book-hero-lead p { font-size: 16px; line-height: 1.65; }
    .book-hero-detail p { font-size: 13px; line-height: 1.55; }
    .book-hero-actions { margin-top: 14px; }
    .book-quick-nav { margin-top: 20px; }
}

@media (max-width: 1180px) {
    .book-hero-grid { grid-template-columns: minmax(230px, .7fr) minmax(0, 1.3fr); gap: 42px; }
    .book-hero-copy h1 { font-size: clamp(36px, 4vw, 40px); }
    .book-status-card { padding: 18px; }
    .book-preview-grid { grid-template-columns: repeat(2, minmax(0,1fr)); gap: 28px 18px; }
}

@media (max-width: 920px) {
    .book-hero { min-height: auto; }
    .book-hero-grid { grid-template-columns: minmax(210px, .65fr) minmax(0, 1.35fr); gap: 34px; align-items: start; }
    .book-cover-stage { max-width: 270px; }
    .book-after-preview-grid { grid-template-columns: 1fr; }
    .book-reading-grid, .book-proof-grid { grid-template-columns: 1fr; gap: 34px; }
    .book-section-heading h2 { max-width: 780px; }
    .book-mechanism-map { grid-template-columns: repeat(2, 1fr); }
    .book-mechanism-map::before { display: none; }
    .book-product--rainbow .book-mechanism-map li:nth-child(n),
    .book-product--moon .book-mechanism-map li:nth-child(n) { transform: none; }
}

@media (max-width: 620px) {
    body.page-book-product { --mobile-dock-h: calc(63px + env(safe-area-inset-bottom)); padding-bottom: var(--mobile-dock-h); }
    .page-book-product .site-header:not(.is-scrolled) { background: rgba(255,253,248,.7); backdrop-filter: blur(12px); }
    .book-hero { padding: calc(var(--header-h) + 6px) 0 18px; }
    .book-hero-grid { grid-template-columns: minmax(0, 1fr); gap: 18px; }
    .book-cover-stage { grid-row: auto; width: min(68vw, 260px); align-self: start; justify-self: center; }
    .book-cover-stage img { width: 100%; max-height: none; box-shadow: 0 20px 46px rgba(36,47,43,.2), 10px 10px 0 rgba(255,255,255,.65); }
    .book-cover-stage figcaption { margin-top: 12px; font-size: 9px; letter-spacing: .1em; }
    .book-cover-orbit { display: none; }
    .book-hero-copy { width: 100%; }
    .book-product .book-hero-copy { box-sizing: border-box; padding-inline: 20px; }
    .book-hero-copy h1 { max-width: none; margin-bottom: 14px; font-size: clamp(28px, 7vw, 34px); line-height: 1.28; }
    .book-product--rainbow .book-hero-copy h1 { font-size: clamp(25px, 6.3vw, 30px); }
    .book-kicker { margin-bottom: 7px; font-size: 9px; letter-spacing: .1em; }
    .book-scope-chip { margin-bottom: 8px; padding: 5px 8px; font-size: 10px; }
    .book-hero-lead p { margin-bottom: 12px; font-size: 14px; line-height: 1.58; }
    .book-hero-detail { margin-top: 0; }
    .book-hero-detail summary { font-size: 12px; }
    .book-hero-detail[open] summary { margin-bottom: 8px; }
    .book-hero-detail p { margin-bottom: 7px; font-size: 12px; line-height: 1.65; }
    .book-hero-actions { width: 100%; margin-top: 11px; display: grid; gap: 12px; }
    .book-hero-actions .button { width: 100%; min-height: 42px; padding: 10px 12px; font-size: 13px; }
    .book-text-link { justify-self: start; font-size: 12px; }
    .book-pdf-preview-head .book-pdf-preview-note { margin-top: 12px; padding-left: 11px; font-size: 12px; line-height: 1.65; }
    .book-status-card { grid-column: 1 / -1; width: 100%; padding: 13px 15px; display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 4px 14px; align-items: center; }
    .book-status-label { grid-column: 1; margin: 0; font-size: 9px; }
    .book-status-card > strong { grid-column: 1; margin: 0; font-size: 16px; }
    .book-price { grid-column: 2; grid-row: 1 / span 2; font-size: 22px; }
    .book-status-card > p { grid-column: 1 / -1; margin: 4px 0 0; font-size: 11px; line-height: 1.45; }
    .book-status-actions { grid-column: 1 / -1; margin-top: 10px; }
    .oracle-progress { grid-column: 1 / -1; margin-top: 6px; }
    .book-after-preview { padding: 28px 0 48px; }
    .book-after-preview-grid { gap: 14px; }
    .book-after-preview-detail { padding: 17px 16px; border-radius: 16px; }
    .book-full-introduction-grid { grid-template-columns: 1fr; gap: 22px; }
    .book-full-introduction-scene { padding: 22px 20px; border-radius: 18px; }
    .book-full-introduction-principles { margin-top: 34px; }
    .book-full-introduction-closing { margin-top: 22px; padding: 28px 20px; border-radius: 18px; }
    .book-full-introduction-closing h3 { font-size: 30px; }
    .book-full-introduction-closing > p:last-child { font-size: 15px; line-height: 1.75; }
    .book-full-introduction-four-card-grid { grid-template-columns: 1fr; gap: 12px; }
    .book-full-introduction-four-card-grid > .book-full-introduction-card { padding: 25px 20px; border-radius: 24px; }
    .book-full-introduction-principle-card h3 { font-size: 27px; }
    .book-quick-nav { margin-top: 18px; justify-content: flex-start; overflow-x: auto; scrollbar-width: none; }
    .book-quick-nav::-webkit-scrollbar { display: none; }
    .book-quick-nav a { flex: 0 0 auto; min-width: 74px; padding: 9px 6px; font-size: 11px; }
    .book-section { padding: 62px 0; }
    .book-reading-grid, .book-proof-grid { gap: 24px; }
    .book-section-heading h2, .book-toc-intro h2 { margin-bottom: 13px; font-size: min(var(--title-section), 30px); }
    .book-section-heading > p:not(.book-kicker), .book-toc-intro > p:not(.book-kicker) { font-size: 14px; line-height: 1.7; }
    .book-prose p { margin-bottom: 15px; font-size: 16px; line-height: 1.8; }
    .book-section-heading--center { margin-bottom: 27px; text-align: left; }
    .book-mechanism-map, .book-product--cross .book-mechanism-map { grid-template-columns: 1fr; gap: 10px; }
    .book-mechanism-map li, .book-product--cross .book-mechanism-map li { min-height: 0; padding: 18px 18px 18px 63px; }
    .book-mechanism-index { position: absolute; top: 20px; left: 17px; margin: 0; }
    .book-mechanism-map h3 { margin: 5px 0 8px; font-size: 19px; }
    .book-mechanism-map p { font-size: 13px; line-height: 1.65; }
    .book-questions li { padding-right: 0; font-size: 14px; }
    .book-toc summary { position: sticky; top: var(--header-h); z-index: 2; padding: 13px 12px; border: 1px solid var(--book-line); border-radius: 10px; background: var(--book-wash); }
    .book-toc:not([open]) ol { display: none; }
    .book-toc li { padding: 14px 8px 14px 42px; font-size: 14px; }
    .book-preview-heading { margin-bottom: 26px; display: block; }
    .book-preview-heading > p { margin-top: 14px; font-size: 13px; }
    .book-preview-grid { grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: 84vw; gap: 14px; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none; padding: 0 max(0px, calc((100vw - 84vw) / 2 - 20px)) 12px 0; }
    .book-preview-grid::-webkit-scrollbar { display: none; }
    .book-preview-card { scroll-snap-align: start; }
    .book-preview-card figcaption { font-size: 12px; }
    .book-deliverable-list li { grid-template-columns: 32px 1fr; gap: 10px; padding: 15px 0; }
    .book-deliverable-list p { font-size: 16px; }
    .book-principle-grid { grid-template-columns: 1fr; gap: 12px; }
    .book-principle-grid article { padding: 25px 20px; }
    .book-principle-grid :is(h2, h3) { font-size: 27px; }
    .book-report-questions .book-section-heading h3 { font-size: 27px; }
    .book-report-questions--wide ol { grid-template-columns: 1fr; gap: 0; }
    .book-report-questions--wide li { font-size: 16px; line-height: 1.7; }
    .book-purchase { padding: 30px 0 42px; }
    .book-purchase .shell { width: 100%; padding-inline: 20px; }
    .book-purchase-bar { grid-template-columns: 1fr; gap: 16px; }
    .book-purchase-plan > strong { margin-bottom: 5px; font-size: 12px; }
    .book-purchase-plan .book-price { margin: 0; font-size: 24px; }
    .book-purchase-facts { gap: 5px; }
    .book-purchase .book-purchase-fact { font-size: 13px; line-height: 1.6; }
    .book-purchase-actions { width: 100%; justify-self: stretch; }
    .book-purchase-actions .button { width: 100%; min-width: 0; }
    .book-scope { padding-bottom: 62px; }
    .book-scope-card { padding: 28px 20px; border-left-width: 4px; border-radius: 2px 18px 18px 2px; }
    .book-scope-card h2 { font-size: 30px; }
    .book-scope-card > p:last-child { font-size: 15px; line-height: 1.75; }
    .book-proof-stat { grid-template-columns: auto 1fr; gap: 7px 12px; }
    .book-proof-stat strong { font-size: 30px; }
    .book-delivery-steps { grid-template-columns: 1fr; gap: 10px; }
    .book-delivery-steps li { padding: 20px; }
    .book-delivery-steps h3 { margin: 10px 0 7px; }
    .book-mid-cta .button { width: 100%; }
    .book-faq-list summary { padding-block: 16px; font-size: 15px; }
    .book-final { padding: 72px 0; }
    .book-final h2 { font-size: clamp(25px, 7.6vw, 30px); }
    .book-final > .shell > p:not(.book-kicker) { font-size: 15px; }
    .book-final .button { width: 100%; }
    .book-lightbox { width: 96vw; max-height: 90vh; padding-inline: 10px; }

    .page-book-product .site-header:not(.is-scrolled) { background: transparent !important; backdrop-filter: none !important; }
    .book-version-note { margin-bottom: 25px; padding: 20px; }
    .book-version-note strong { font-size: 18px; }
    .book-reader-launch { margin-top: 34px; padding: 24px 20px; grid-template-columns: 1fr; gap: 20px; }
    .book-reader-launch h3 { font-size: 29px; }
    .book-reader-launch .button { width: 100%; }
    .book-reader-stack { min-height: 196px; }
    .book-reader-stack img { width: 128px; }
    .book-reader-toolbar { justify-content: flex-end; align-items: center; gap: 0; padding: 9px 10px; }
    .book-reader-toolbar > div:first-child { display: none; }
    .book-reader-tools { gap: 3px; }
    .book-reader-tools button { min-width: 34px; height: 34px; padding-inline: 6px; font-size: 12px; }
    .book-reader-viewport { grid-template-columns: 40px minmax(0,1fr) 40px; }
    .book-reader-arrow { width: 36px; height: 36px; }
    .book-reader-canvas { padding: 7px 2px; touch-action: pan-y; }
    .book-reader-canvas img { width: 100%; height: auto; max-height: 100%; }
    .book-reader-footer { padding: 8px 9px calc(9px + env(safe-area-inset-bottom)); }
    .book-reader-footer > small { display: none; }
    .book-reader-thumbs button { flex-basis: 44px; height: 58px; }
}

@media (min-width: 391px) and (max-width: 620px) and (max-height: 920px) {
    .book-product--launch-report .book-cover-stage,
    .book-product--almanac .book-cover-stage { width: min(60vw, 228px); }
}

@media (max-width: 390px) {
    .book-hero-grid { gap: 2px; }
    .book-cover-stage { width: min(52vw, 205px); }
    .book-hero-copy h1 { font-size: clamp(27px, 8vw, 31px); }
    .book-hero-lead p { font-size: 13px; }
    .book-hero-actions .button { font-size: 12px; }
}

@media (max-width: 920px) {
    .book-almanac-offer {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .book-almanac-offer-action {
        width: 100%;
        justify-self: stretch;
    }

    .book-almanac-offer-action .button { width: 100%; }
}

@media (max-width: 620px) {
    .book-product--almanac .book-section:not(.book-pdf-preview) {
        padding-block: 56px;
    }

    .book-product--almanac .book-almanac-quick-nav {
        margin-bottom: 34px;
        flex-wrap: nowrap;
        justify-content: flex-start;
    }

    .book-product--almanac .book-full-introduction-four-card-grid .book-prose p,
    .book-product--almanac .book-full-introduction-principle-card p:not(.book-kicker) {
        font-size: 15px;
        line-height: 1.75;
    }

    .book-product--almanac .book-scope {
        padding-block: 0 56px;
    }

    .book-almanac-offer {
        margin-bottom: 18px;
        padding: 22px 20px;
        border-radius: 18px;
    }

    .book-almanac-offer-state > strong { font-size: 18px; }
    .book-almanac-offer-copy p { font-size: 13px; }

    .book-product--almanac .book-version-note {
        margin-bottom: 18px;
        padding: 22px 20px;
        border-left-width: 4px;
        border-radius: 3px 18px 18px 3px;
    }

    .book-product--almanac .book-delivery-steps li {
        min-height: 0;
        padding: 22px 20px;
        border-radius: 18px;
    }

    .book-product--almanac .book-delivery-steps h3 { margin-top: 14px; }
    .book-product--almanac .book-faq-list summary { padding-inline: 16px 48px; }
    .book-product--almanac .book-faq-list details p { padding-inline: 16px 48px; }
}

/* HD II / III 已確認簡介頁：沒有完整成品前，只呈現真實封面、範圍與追蹤。 */
.book-product--upcoming .upcoming-book-hero {
    min-height: min(900px, 100svh);
}

.book-product--upcoming .book-hero-grid {
    width: 100%;
    grid-template-columns: minmax(260px, .7fr) minmax(440px, 1.28fr) minmax(210px, .48fr);
    gap: clamp(30px, 4vw, 72px);
    align-items: center;
}

.book-product--upcoming .book-hero-copy h1 {
    max-width: 720px;
}

.upcoming-inline-term {
    white-space: nowrap;
}

.upcoming-book-scope {
    background: rgba(255, 253, 248, .92);
}

.upcoming-book-status {
    background: var(--book-soft);
}

.upcoming-scope-list {
    display: flex;
    flex-wrap: wrap;
    align-content: start;
    gap: 12px;
}

.upcoming-scope-list span {
    padding: 11px 15px;
    border: 1px solid var(--book-line);
    border-radius: 999px;
    background: rgba(255, 255, 255, .76);
    color: var(--book-ink);
    font-size: 15px;
    font-weight: 800;
}

.book-product--upcoming .upcoming-book-status .button {
    margin-top: 12px;
}

@media (max-width: 1180px) and (min-width: 921px) {
    .book-product--upcoming .book-hero-grid {
        grid-template-columns: minmax(230px, .63fr) minmax(390px, 1.2fr) minmax(190px, .45fr);
        gap: 28px;
    }
}

@media (max-width: 920px) {
    .book-product--upcoming .upcoming-book-hero {
        min-height: auto;
    }

    .book-product--upcoming .book-hero-grid {
        grid-template-columns: minmax(210px, .65fr) minmax(0, 1.35fr);
        gap: 34px;
        align-items: start;
    }

    .book-product--upcoming .book-cover-stage {
        grid-row: 1 / span 2;
    }

    .book-product--upcoming .book-status-card {
        grid-column: 2;
        width: min(100%, 470px);
    }
}

@media (max-width: 620px) {
    .book-product--upcoming .book-hero-grid {
        grid-template-columns: 118px minmax(0, 1fr);
        gap: 16px;
        align-items: start;
    }

    .book-product--upcoming .book-cover-stage {
        grid-row: auto;
    }

    .book-product--upcoming .book-status-card {
        grid-column: 1 / -1;
        width: 100%;
    }

    .book-product--upcoming .book-hero-copy h1 {
        font-size: clamp(25px, 7.3vw, 32px);
        line-height: 1.2;
    }

    .upcoming-scope-list {
        gap: 8px;
    }

    .upcoming-scope-list span {
        padding: 9px 12px;
        font-size: 13px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .book-product *, .book-product *::before, .book-product *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}