/* ========================================
   CANVAS SCROLL NAVIGATION
   Modern scroll arrows for PDF navigation
   ======================================== */

.canvas-scroll-nav {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.98);
    padding: 9px 5px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(0, 0, 0, 0.08);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, padding 0.3s ease;
}

.canvas-scroll-nav.visible {
    opacity: 1;
    pointer-events: all;
}

/* Collapsed state */
.canvas-scroll-nav.collapsed {
    padding: 7px 4px;
    gap: 0;
}

.canvas-scroll-nav.collapsed>*:not(.scroll-collapse-btn):not(.scroll-nav-divider:first-of-type) {
    display: none;
}

.scroll-nav-btn {
    width: 30px;
    height: 30px;
    border: none;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #ffffff;
    border-radius: 9px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    flex-shrink: 0;
}

.scroll-nav-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.scroll-nav-btn:active {
    transform: translateY(-1px);
}

.scroll-double-btn {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.scroll-double-btn:hover {
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.4);
}

/* Collapse button styling */
.scroll-collapse-btn {
    background: linear-gradient(135deg, #9333ea 0%, #7c3aed 100%);
    box-shadow: 0 4px 12px rgba(147, 51, 234, 0.3);
}

.scroll-collapse-btn:hover {
    box-shadow: 0 8px 20px rgba(147, 51, 234, 0.4);
}

.scroll-nav-btn:disabled {
    background: #e2e8f0;
    color: #94a3b8;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

.scroll-nav-divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.1), transparent);
    margin: 3px 0;
    transition: all 0.3s ease;
}

.canvas-scroll-nav.collapsed .scroll-nav-divider:not(:first-of-type) {
    display: none;
}

.page-info-section {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: center;
    justify-content: center;
    padding: 4px 0;
    width: 100%;
}

.scroll-nav-indicator {
    text-align: center;
    font-size: 11px;
    color: #1e293b;
    font-weight: 700;
    padding: 0;
    letter-spacing: 0.3px;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Page Jump Input */
.page-jump-input {
    width: 30px;
    height: 24px;
    border: 2px solid #e2e8f0;
    background: #f8fafc;
    color: #1e293b;
    border-radius: 6px;
    text-align: center;
    font-size: 10px;
    font-weight: 700;
    outline: none;
    transition: all 0.2s ease;
    padding: 0;
    margin: 0 auto;
    line-height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-jump-input::placeholder {
    color: #94a3b8;
    font-weight: 600;
    font-size: 8px;
}

.page-jump-input:focus {
    border-color: #667eea;
    background: #ffffff;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.15);
}

.page-jump-input:hover {
    border-color: #cbd5e1;
    background: #ffffff;
}

/* Dark Theme */
:root.dark-theme .canvas-scroll-nav {
    background: rgba(30, 41, 59, 0.95);
    border-color: rgba(255, 255, 255, 0.1);
}

:root.dark-theme .scroll-nav-indicator {
    color: #94a3b8;
}

:root.dark-theme .page-jump-input {
    background: #1e293b;
    border-color: #334155;
    color: #f1f5f9;
}

:root.dark-theme .page-jump-input::placeholder {
    color: #64748b;
}

:root.dark-theme .page-jump-input:focus {
    border-color: #4f46e5;
    background: #0f172a;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

:root.dark-theme .page-jump-input:hover {
    border-color: #475569;
}

/* Black Theme */
:root.black-theme .canvas-scroll-nav {
    background: rgba(10, 10, 10, 0.95);
    border-color: rgba(255, 255, 255, 0.05);
}

:root.black-theme .scroll-nav-indicator {
    color: #888888;
}

:root.black-theme .page-jump-input {
    background: #1a1a1a;
    border-color: #2d2d2d;
    color: #ffffff;
}

:root.black-theme .page-jump-input::placeholder {
    color: #666666;
}

:root.black-theme .page-jump-input:focus {
    border-color: #3d3d3d;
    background: #0a0a0a;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.05);
}

:root.black-theme .page-jump-input:hover {
    border-color: #3d3d3d;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .canvas-scroll-nav {
        right: 10px;
        padding: 7px 4px;
        gap: 5px;
        border-radius: 10px;
    }

    .scroll-nav-btn {
        width: 26px;
        height: 26px;
        font-size: 10px;
        border-radius: 7px;
    }

    .scroll-nav-indicator {
        font-size: 10px;
    }

    .page-jump-input {
        width: 26px;
        height: 20px;
        font-size: 9px;
        line-height: 16px;
    }

    .page-jump-input::placeholder {
        font-size: 7px;
    }
}

/* Animation for appearance */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px) translateY(-50%);
    }

    to {
        opacity: 1;
        transform: translateX(0) translateY(-50%);
    }
}

.canvas-scroll-nav.visible {
    animation: slideInRight 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}