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h3{margin:.35rem 0 1.5rem;font-size:clamp(1.65rem,3vw,2.25rem)}.compact-grid{gap:1rem 1.25rem}.edition-choice-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:.8rem;display:grid}.edition-choice{border:1px solid var(--color-border);border-radius:calc(var(--radius) + 4px);background:color-mix(in oklab, var(--color-card) 55%, transparent);min-height:7.5rem;color:var(--color-foreground);text-align:left;cursor:pointer;opacity:.62;grid-template-columns:1fr auto;align-items:center;gap:.9rem 1rem;padding:1.15rem;transition:border-color .2s,background-color .2s,opacity .2s,transform .2s;display:grid;position:relative}.edition-choice:hover,.edition-choice:focus-visible{border-color:color-mix(in oklab, var(--color-primary) 65%, transparent);opacity:1}.edition-choice.selected{border-color:var(--color-primary);background:color-mix(in oklab, var(--color-primary) 12%, var(--color-card));opacity:1}.edition-choice>span:first-child{gap:.35rem;display:grid}.edition-choice strong{font-size:.98rem;font-weight:600}.edition-choice small{color:var(--color-muted-foreground);font-size:.78rem}.edition-choice-price{color:var(--color-primary);font-family:var(--font-display);font-size:1.5rem}.edition-choice svg{color:var(--color-primary);position:absolute;bottom:.75rem;right:.75rem}.purchase-actions{justify-content:space-between;gap:.8rem;margin-top:1.5rem;display:flex}.purchase-actions.end{justify-content:flex-end}.order-review,.order-total{border-top:1px solid var(--color-border);border-bottom:1px solid var(--color-border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem 1.5rem;padding:1rem 0;display:flex}.order-review p{color:var(--color-muted-foreground);flex-basis:100%;font-size:.88rem}.order-total{margin-top:1.5rem}.order-total strong{color:var(--color-primary);font-family:var(--font-display);font-size:1.5rem}.checkout-form{min-width:0}.buy-layout .book-stage,.buy-layout .book-fallback{background:0 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dt{color:var(--color-muted-foreground);letter-spacing:.12em;text-transform:uppercase;font-size:.72rem}.author-facts dd{color:var(--color-foreground);line-height:1.55}.author-profile-section blockquote{align-self:center;margin:0;font-size:clamp(1.8rem,4vw,3.4rem)}.research-detail-grid{border-top:1px solid var(--color-border);grid-template-columns:repeat(2,minmax(0,1fr));gap:1.5rem;margin-top:1.2rem;padding-top:1.2rem;display:grid}.research-detail-grid strong{color:var(--color-foreground);letter-spacing:.12em;text-transform:uppercase;margin-bottom:.65rem;font-size:.75rem;display:block}.research-detail-grid ul{gap:.45rem;padding-left:1rem;list-style:outside;display:grid}.domain button svg{flex:none;transition:transform .2s}@media 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