/* Book Navigation Controls - Sentence navigation for library books */

.book-navigation-controls-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
    padding: 12px 0;
    border-top: 1px solid #e1e5e9;
    flex-wrap: wrap;
}

.book-nav-btn {
    background: #059669;
    color: white;
    border: 1px solid #059669;
    padding: 10px 20px;
    border-radius: 0;
    font-size: 14px;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 50px;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.book-nav-btn:hover:not(:disabled) {
    background: #047857;
    border-color: #047857;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.3);
}

.book-nav-btn:active:not(:disabled) {
    transform: translateY(0);
}

.book-nav-btn:disabled {
    background: #9ca3af;
    border-color: #9ca3af;
    color: #d1d5db;
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
    box-shadow: none;
}

/* Specific button styling - removed to ensure equal height for all buttons */

/* Tooltip support for navigation buttons */
.book-nav-btn[data-tooltip] {
    position: relative;
}

/* Responsive design */
@media (max-width: 768px) {
    .book-navigation-controls-row {
        gap: 8px;
    }
    
    .book-nav-btn,
    .continue-reading-btn {
        padding: 8px 16px;
        font-size: 14px;
        min-width: 45px;
    }
    
    #bookNavExpandBtn,
    #bookNavShrinkBtn {
        font-size: 18px;
        padding: 6px 16px;
    }
}

@media (max-width: 480px) {
    .book-navigation-controls-row {
        gap: 6px;
    }
    
    .book-nav-btn,
    .continue-reading-btn {
        flex: 1;
        min-width: 40px;
        padding: 8px 12px;
        font-size: 13px;
    }
}

/* Animation for button state changes */
@keyframes buttonPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.book-nav-btn.loading {
    animation: buttonPulse 1s ease-in-out infinite;
    pointer-events: none;
}

/* Focus styles for accessibility */
.book-nav-btn:focus {
    outline: 2px solid #4f46e5;
    outline-offset: 2px;
}

/* Dark mode support (if needed in future) */
@media (prefers-color-scheme: dark) {
    .book-navigation-label {
        color: #e5e7eb;
    }
    
    .book-navigation-controls-row {
        border-top-color: #374151;
    }
}