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0 0 1.5px var(--zs-accent);transform:rotate(0)translateY(2px)}.bc-welcome-cta:focus-visible{box-shadow:3px 4px 0 0 var(--zs-ink), inset 0 0 0 1.5px var(--zs-accent), 0 0 0 3px var(--zs-accent-ring);outline:none}.bc-welcome-cta-orb{border-radius:var(--zs-r-sm);background:var(--zs-accent-soft);flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;display:inline-flex}.bc-welcome-keep{border-top:1px solid var(--zs-ink-faint);max-width:30em;margin:28px auto 0;padding-top:18px}.bc-welcome-keep-lead{font-family:var(--zs-font-display);font-variation-settings:"opsz" 32;color:var(--zs-ink);margin:0 0 6px;font-size:16px;font-weight:400}.bc-welcome-keep-note{font-family:var(--zs-font-ui);color:var(--zs-ink-muted);text-wrap:pretty;margin:0;font-size:13px;line-height:1.55}.bc-welcome-hint{font-family:var(--zs-font-ui);letter-spacing:.04em;color:var(--zs-ink-muted);margin-top:16px;font-size:11.5px}.bc-cover-scene{z-index:50;flex-direction:column;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.bc-cover-scene:before{content:"";pointer-events:none;background:radial-gradient(46% 60% at 50% 36%, rgba(var(--ambient-a), .16), transparent 70%), radial-gradient(70% 40% at 50% 88%, #f0e6cd0f, transparent 70%);position:absolute;inset:0}.bc-cover-book{aspect-ratio:96/100;width:min(90vw,70vh,520px);box-shadow:var(--zs-lift-2);border-left:5px solid var(--zs-accent);border-radius:8px 18px 18px 8px;position:relative;overflow:hidden}.bc-cover-float{transform-style:preserve-3d;animation:4s ease-in-out infinite 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var(--zs-accent);filter:brightness(1.05);transform:rotate(-1.2deg)translateY(-2px)}.bc-open-btn-icon{background:var(--zs-accent-soft);width:36px;height:36px;box-shadow:none;transition:transform .45s var(--bc-ease);border-radius:9px;flex-shrink:0;justify-content:center;align-items:center;display:inline-flex}.bc-open-btn:hover .bc-open-btn-icon{transform:translate(2px)scale(1.06)}.bc-root[data-purpose=preview] .bc-open-btn{letter-spacing:.2px;transform-origin:50%;min-height:0;transition:transform .45s var(--bc-ease), box-shadow .45s var(--bc-ease);border:1px solid #ffffff8c;border-radius:100px;padding:13px 32px 13px 16px;font-size:14px}.bc-root[data-purpose=preview] .bc-open-btn:hover{filter:none;transform:translateY(-3px)}.bc-root[data-purpose=preview] .bc-open-btn-icon{border-radius:50%}.bc-reading{flex-direction:column;display:flex;position:absolute;inset:0}.bc-entrance{animation:.8s cubic-bezier(.2,.8,.2,1) forwards 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18px;font-family:inherit;font-size:12.5px;font-weight:600;text-decoration:none;display:inline-flex}.bc-glass-btn:hover{box-shadow:var(--zs-lift-2);transform:translateY(-2px)}.bc-glass-btn.primary{box-shadow:3px 4px 0 0 var(--zs-ink), inset 0 0 0 1.5px var(--zs-accent);color:var(--zs-accent-ink)}.bc-glass-btn.primary:hover{box-shadow:6px 8px 0 0 var(--zs-ink), inset 0 0 0 1.5px var(--zs-accent);transform:rotate(-1.2deg)translateY(-2px)}.bc-book-area{flex:1;justify-content:center;align-items:center;display:flex;position:relative}.bc-book-shadow{background:var(--zs-ground-sunken);box-shadow:var(--zs-lift-1);z-index:1;border-radius:3px;position:absolute}.bc-book-spine{z-index:10;pointer-events:none;background:linear-gradient(90deg,#0000 0%,#00000080 40%,#ffffff0d 50%,#00000080 60%,#0000 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