/* Book-sales copy implementation — 2026-07-28
   Copy and layout support only. Existing 3-D book assets and behavior are untouched. */
.book-subtitle{font-family:Georgia,serif;font-style:italic;font-size:clamp(1.05rem,1.8vw,1.35rem);color:#445668;margin:.8rem 0 1rem;max-width:760px}
.book-hero h1{font-size:clamp(2.35rem,4.6vw,5rem)}
.book-hero .hero-copy{max-width:760px}
.card-grid.three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}
.section-heading.centered{text-align:center;max-width:900px;margin:0 auto 1.5rem}
.section-heading h2,.comparison-section h2,.three-book-relationship h2,.book-closing-cta h2{font-size:clamp(2rem,3.8vw,3.8rem);color:var(--text)}
.reader-understanding{padding-bottom:1rem}
.takeaway-grid .glass-card{position:relative;padding-top:3.2rem}
.number-mark{position:absolute;top:1rem;left:1.2rem;width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--blue);color:#fff;font-weight:900}
.book-context-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;padding-top:1rem}
.book-context-grid .glass-card h2{font-size:1.45rem;line-height:1.1}
.book-closing-cta,.closing-line,.three-book-relationship{background:linear-gradient(135deg,#fff,#f8fafb);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}
.book-closing-cta{text-align:center;margin-bottom:clamp(2.5rem,5vw,5rem);padding-inline:clamp(1.2rem,4vw,3rem)}
.book-closing-cta .actions-row{justify-content:center}
.book-closing-cta .btn.ghost{background:#fff;color:var(--navy);border-color:var(--line)}
.comparison-grid .glass-card{display:flex;flex-direction:column}
.comparison-grid .glass-card .btn{margin-top:auto}
.closing-line{display:flex;justify-content:space-between;align-items:center;gap:1.5rem;margin-top:1.3rem;padding:1.4rem}
.closing-line p{margin:0;font-weight:800;color:var(--text)}
.progression-row{grid-template-columns:minmax(0,1fr) auto!important}
.progression-row .progression-copy{display:grid;grid-template-columns:42px minmax(0,1fr);gap:.2rem .8rem}
.progression-row .progression-copy>div{display:block}
.progression-row small{display:block;margin-top:.35rem}
.progression-row .availability-note{font-weight:800;color:var(--text)}
.home-page .proof-strip-inner{grid-template-columns:repeat(3,minmax(0,1fr))!important}
.home-page .proof-strip-inner article:nth-child(3n){border-right:0}
.home-page .proof-strip-inner article:nth-child(-n+3){border-bottom:1px solid var(--line)}
.floor:after{content:"↥"}.books:after{content:"III";font-size:.68rem}
.store-book-heading{grid-template-columns:130px minmax(0,1fr)}
.store-sales-line{max-width:980px;margin:.75rem 0 .4rem;color:var(--muted)}
.availability-line{font-weight:850;color:var(--text);margin:0}
.btn.coming-soon[disabled]{cursor:not-allowed;opacity:.68;pointer-events:none;filter:saturate(.45)}
.three-book-relationship{margin-top:1rem;margin-bottom:2rem;padding:clamp(1.5rem,4vw,3rem)}
.three-book-relationship p{max-width:1000px}
.media-book-block{border-top:1px solid var(--line);padding-top:1.4rem;margin-top:1.4rem}
.media-book-block h3{font-size:clamp(1.7rem,3vw,2.7rem);color:var(--blue)}
.media-book-block .subtitle{color:#445668}
.speaking-topics{grid-template-columns:repeat(3,minmax(0,1fr))}
.speaking-topics .glass-card:last-child{grid-column:span 2}
.book-bridge{margin-top:2rem;padding:1.4rem;border-left:5px solid var(--blue);background:#fff;border-radius:12px;box-shadow:0 12px 28px rgba(16,38,58,.08)}
.book-bridge h2{font-size:clamp(1.55rem,3vw,2.5rem)}
.btn.secondary{background:#fff;color:var(--blue);border:1px solid var(--blue)}
@media(max-width:900px){
 .card-grid.three,.book-context-grid,.speaking-topics{grid-template-columns:1fr}
 .speaking-topics .glass-card:last-child{grid-column:auto}
 .closing-line{display:grid}
 .home-page .proof-strip-inner{grid-template-columns:repeat(2,minmax(0,1fr))!important}
 .home-page .proof-strip-inner article:nth-child(3n){border-right:1px solid var(--line)}
 .home-page .proof-strip-inner article:nth-child(2n){border-right:0}
 .home-page .proof-strip-inner article{border-bottom:1px solid var(--line)!important}
 .home-page .proof-strip-inner article:nth-last-child(-n+2){border-bottom:0!important}
}
@media(max-width:560px){
 .home-page .proof-strip-inner{grid-template-columns:1fr!important}
 .home-page .proof-strip-inner article{border-right:0!important;border-bottom:1px solid var(--line)!important}
 .home-page .proof-strip-inner article:last-child{border-bottom:0!important}
 .progression-row{grid-template-columns:1fr!important}
 .store-book-heading{grid-template-columns:88px minmax(0,1fr)}
}