.viewer-panel{background:#fff;border:1px solid var(--line);border-radius:32px;padding:24px;box-shadow:var(--shadow)}
.viewer-topbar{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:18px}
.viewer-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.viewer-actions .mode-btn,.viewer-actions .action-btn{appearance:none;border:1px solid var(--line);background:#fff;color:var(--ink);padding:12px 16px;border-radius:16px;font-weight:900;font-size:15px;line-height:1;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;min-height:46px}
.viewer-actions .mode-btn.active{background:var(--navy);color:#fff;border-color:var(--navy)}
.viewer-actions .action-btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.viewer-actions .action-btn.dark{background:var(--navy);color:#fff;border-color:var(--navy)}
.viewer-shell{background:#f4efe6;border:1px solid var(--line);border-radius:28px;padding:18px}
.viewer-mode{display:none}.viewer-mode.active{display:block}
.flipbook-wrap{display:grid;grid-template-columns:250px 1fr;gap:18px;align-items:start}
.flip-sidebar{background:#fff;border:1px solid var(--line);border-radius:22px;padding:14px;max-height:760px;overflow:auto}
.flip-sidebar h3{margin:0 0 12px;font-size:18px;color:var(--ink)}
.thumb-list{display:grid;gap:10px}
.thumb{appearance:none;border:1px solid var(--line);background:#fff;border-radius:16px;padding:8px;cursor:pointer;text-align:left}
.thumb img{width:100%;height:auto;border-radius:10px;border:1px solid var(--line)}
.thumb span{display:block;font-size:13px;font-weight:800;color:var(--muted);margin-top:8px}
.thumb.active{border-color:var(--accent);box-shadow:0 0 0 3px rgba(216,156,47,.18)}
.book-panel{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px}
.book-toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
.book-toolbar .counter{font-size:16px;font-weight:900;color:var(--ink)}
.book-toolbar .controls{display:flex;gap:8px;flex-wrap:wrap}
.book-toolbar button{appearance:none;border:1px solid var(--line);background:#fff;color:var(--ink);padding:10px 14px;border-radius:14px;font-weight:900;cursor:pointer}
.book-toolbar button.primary{background:var(--navy);border-color:var(--navy);color:#fff}
.book-stage{perspective:2200px;background:#f6f0e7;border:1px solid var(--line);border-radius:22px;padding:20px;min-height:730px;display:grid;align-items:center}
.book-spread{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
.book-page{position:relative;background:#fff;border:1px solid #d8c9b3;border-radius:18px;box-shadow:0 16px 38px rgba(7,26,51,.12);overflow:hidden;min-height:620px;display:flex;align-items:center;justify-content:center;transform-style:preserve-3d}
.book-page img{width:100%;height:auto;display:block}
.book-page.left::after,.book-page.right::before{content:"";position:absolute;top:0;bottom:0;width:16px;pointer-events:none}
.book-page.left::after{right:0;background:linear-gradient(to left,rgba(7,26,51,.06),transparent)}
.book-page.right::before{left:0;background:linear-gradient(to right,rgba(7,26,51,.06),transparent)}
.book-page.turn-forward{animation:pageTurnForward .55s ease}
.book-page.turn-back{animation:pageTurnBack .55s ease}
@keyframes pageTurnForward{0%{transform:rotateY(0)}50%{transform:rotateY(-28deg)}100%{transform:rotateY(0)}}
@keyframes pageTurnBack{0%{transform:rotateY(0)}50%{transform:rotateY(28deg)}100%{transform:rotateY(0)}}
.page-caption{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:10px;color:var(--muted);font-size:14px;font-weight:800}
.single-page-note{display:none}
.pdf-frame-wrap{background:#fff;border:1px solid var(--line);border-radius:22px;padding:10px}
.pdf-frame{width:100%;height:980px;border:0;border-radius:16px;background:#f0e8da}
.proof-grid-clean .preview-card p{font-size:15px}
@media(max-width:980px){.flipbook-wrap{grid-template-columns:1fr}.flip-sidebar{max-height:none}.book-stage{min-height:0}.book-spread{grid-template-columns:1fr}.book-page.left,.page-caption span:last-child{display:none}.single-page-note{display:block;color:var(--muted);font-size:14px;font-weight:800;margin-bottom:10px}.pdf-frame{height:700px}}
@media(max-width:760px){.viewer-actions{width:100%}.viewer-actions .mode-btn,.viewer-actions .action-btn{flex:1 1 140px}.book-page{min-height:0}.pdf-frame{height:560px}}