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var(--border-color);border-radius:var(--radius-md);padding:var(--spacing-sm);text-align:center;cursor:pointer;transition:.3s;display:flex;flex-direction:column;align-items:center;position:relative;overflow:hidden}.bookshelf-item:hover{transform:translateY(-4px);box-shadow:0 8px 16px rgba(0,0,0,.12);border-color:var(--primary-color)}.bookshelf-item.selected{border-color:var(--primary-color);background:rgba(74,107,255,.05)}.book-cover{width:80px;height:110px;object-fit:cover;border-radius:var(--radius-sm);margin-bottom:var(--spacing-sm);box-shadow:0 2px 8px rgba(0,0,0,.1)}.book-cover-placeholder{width:80px;height:110px;background:linear-gradient(135deg,#667eea 0,#764ba2 100%);border-radius:var(--radius-sm);margin-bottom:var(--spacing-sm);box-shadow:0 2px 8px 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i{font-size:4rem;margin-bottom:var(--spacing-md)}.selected-book-info{transition:.3s}.bookshelf-container::-webkit-scrollbar{height:6px}.bookshelf-container::-webkit-scrollbar-track{background:var(--bg-tertiary);border-radius:var(--radius-full)}.bookshelf-container::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-full)}.bookshelf-container::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}@media (max-width:768px){.bookshelf-row{grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:var(--spacing-sm)}.book-cover{width:70px;height:95px}.book-title{font-size:.75rem}}@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}body.dark-theme .progress-bar,html[data-theme=dark] .progress-bar{background:#4d4d4d}