/* ===== whiteboard-core.css ===== */
/* Whiteboard modal, container, toolbar, tool buttons, color picker, */
/* canvas area, dark mode, animations, responsive, performance */

/* ===== Whiteboard/Blackboard Styles ===== */

/* Whiteboard Modal */
.whiteboard-modal .modal-content {
    max-width: 100vw;
    height: 100vh;
    width: 100vw;
    border-radius: 0;
    box-shadow: none;
    max-height: 100vh;
    display: flex;
    flex-direction: column;
}

.whiteboard-modal .modal-body {
    padding: 0;
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

/* Whiteboard Container */
.whiteboard-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: var(--color-bg-primary);
}

/* Toolbar */
.whiteboard-toolbar {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: 0.5rem 0.5rem;
    background: none !important;  
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}

.whiteboard-penbar-section {
    margin-right: auto;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.whiteboard-toolbar-section {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.whiteboard-toolbar-divider {
    width: 1px;
    height: 32px;
    background-color: var(--color-border);
    margin: 0 var(--space-sm);
}

/* Tool Buttons */
.whiteboard-tool-btn {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    position: relative;
}

.whiteboard-tool-btn:hover:not(:disabled) {
    background-color: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.whiteboard-tool-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.whiteboard-tool-btn.active {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.whiteboard-tool-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.whiteboard-tool-btn svg {
    width: 20px;
    height: 20px;
}

/* Tool button with tooltip */
.whiteboard-tool-btn::after {
    content: attr(aria-label);
    position: absolute;
    top: calc(100% + 8px);
    bottom: auto;
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    background-color: var(--color-text-primary);
    color: var(--color-bg-primary);
    padding: var(--space-xs) var(--space-md);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-fast);
    z-index: 100;
}

.whiteboard-tool-btn:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Color Picker */
.whiteboard-color-picker {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.whiteboard-color-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.whiteboard-color-btn:hover {
    transform: scale(1.15);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.whiteboard-color-btn.active {
    border-color: var(--color-text-primary);
    transform: scale(1.15);
    box-shadow: 0 0 0 2px var(--color-bg-secondary);
}

.whiteboard-color-btn.active::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
    font-weight: bold;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

/* Custom color input */
.whiteboard-custom-color {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    cursor: pointer;
    overflow: hidden;
    transition: all var(--transition-fast);
    background: linear-gradient(45deg, 
        red 0%, red 14.28%, 
        orange 14.28%, orange 28.56%,
        yellow 28.56%, yellow 42.84%,
        green 42.84%, green 57.12%,
        blue 57.12%, blue 71.4%,
        indigo 71.4%, indigo 85.68%,
        violet 85.68%, violet 100%
    );
}

.whiteboard-custom-color:hover {
    transform: scale(1.15);
}

.whiteboard-custom-color input[type="color"] {
    opacity: 0;
    position: absolute;
    width: 32px;
    height: 32px;
    cursor: pointer;
}

/* Size Slider */
.whiteboard-size-control {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xs) var(--space-md);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.whiteboard-size-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    min-width: 60px;
}

.whiteboard-size-slider {
    width: 120px;
    height: 4px;
    border-radius: 2px;
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
}

.whiteboard-size-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.whiteboard-size-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.whiteboard-size-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
}

.whiteboard-size-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.whiteboard-size-preview {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.whiteboard-size-preview-dot {
    background-color: var(--color-text-primary);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

/* Zoom Controls */
.whiteboard-zoom-control {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.whiteboard-zoom-display {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-primary);
    min-width: 48px;
    text-align: center;
    font-family: var(--font-mono);
}

/* Spacer to push actions to the right */
.whiteboard-toolbar-spacer {
    flex: 1;
}

/* Action Buttons */
.whiteboard-action-btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.whiteboard-action-btn.primary {
    background-color: var(--color-accent);
    color: white;
}

.whiteboard-action-btn.primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.whiteboard-action-btn.secondary {
    background-color: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.whiteboard-action-btn.secondary:hover {
    background-color: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.whiteboard-action-btn svg {
    width: 16px;
    height: 16px;
}

/* Canvas Area */
.whiteboard-canvas-area {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--color-bg-primary);
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Dark mode blackboard appearance */
[data-theme="dark"] .whiteboard-canvas-area {
    background-color: var(--bg-primary);
    background-image: 
        linear-gradient(var(--canvas-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--canvas-grid) 1px, transparent 1px);
}

.whiteboard-canvas {
    position: absolute;
    top: 0;
    left: 0;
    cursor: crosshair;
    transition: transform 0.1s ease-out;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    
    /* GPU acceleration for smooth drawing */
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Canvas shadows for depth */
.whiteboard-canvas-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 20px;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.05), transparent);
    pointer-events: none;
    z-index: 1;
}

.whiteboard-canvas-area::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 20px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.05), transparent);
    pointer-events: none;
    z-index: 1;
}

/* Zoom overlay hint */
.whiteboard-zoom-hint {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.75);
    color: white;
    padding: var(--space-sm) var(--space-lg);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
    z-index: 10;
    backdrop-filter: blur(8px);
}

.whiteboard-canvas-area:hover .whiteboard-zoom-hint {
    opacity: 0.9;
}

/* Keyboard shortcut hints */
.whiteboard-shortcuts {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    padding: var(--space-md);
    font-size: 12px;
    color: var(--color-text-secondary);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
    max-width: 200px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.whiteboard-canvas-area:hover .whiteboard-shortcuts {
    opacity: 0.8;
}

.whiteboard-shortcuts h4 {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.whiteboard-shortcuts ul {
    list-style: none;
    padding: 0;
}

.whiteboard-shortcuts li {
    margin: var(--space-xs) 0;
    display: flex;
    justify-content: space-between;
    gap: var(--space-md);
}

.whiteboard-shortcuts kbd {
    background-color: var(--color-bg-tertiary);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 10px;
    border: 1px solid var(--color-border);
}

/* Footer with post button */
.whiteboard-footer {
    padding: var(--space-lg) var(--space-xl);
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.whiteboard-footer-info {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.whiteboard-footer-actions {
    display: flex;
    gap: var(--space-md);
}

/* Animations */
@keyframes toolActivate {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.whiteboard-tool-btn.active {
    animation: toolActivate 0.3s ease-out;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .whiteboard-toolbar {
        padding: var(--space-md);
        gap: var(--space-sm);
    }
    
    .whiteboard-toolbar-section {
        gap: var(--space-xs);
    }
    
    .whiteboard-size-control {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .whiteboard-shortcuts {
        display: none;
    }
    
    .whiteboard-zoom-hint {
        font-size: 11px;
        padding: var(--space-xs) var(--space-md);
    }
}

/* Performance optimizations */
.whiteboard-canvas {
    will-change: transform;
}

/* Smooth cursor transitions */
.whiteboard-canvas.drawing {
    cursor: crosshair;
}

.whiteboard-canvas.erasing {
    cursor: cell;
}

.whiteboard-canvas.panning {
    cursor: grabbing;
}

/* Loading state */
.whiteboard-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.whiteboard-loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Success feedback when posting */
.whiteboard-post-success {
    position: fixed;
    bottom: var(--space-2xl);
    right: var(--space-2xl);
    background-color: var(--color-success);
    color: white;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    animation: slideInRight 0.3s ease-out;
    z-index: 10001;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Elegant hover effects for toolbar */
.whiteboard-toolbar-section {
    position: relative;
}

.whiteboard-toolbar-section::before {
    content: '';
    position: absolute;
    inset: -4px;
    background: var(--color-accent);
    opacity: 0;
    border-radius: var(--border-radius-sm);
    transition: opacity var(--transition-fast);
    z-index: -1;
}

.whiteboard-toolbar-section:focus-within::before {
    opacity: 0.05;
}

/* High-quality rendering hints */
.whiteboard-canvas {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Prevent text selection during drawing */
.whiteboard-canvas-area {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
}

/* === CRITICAL: Ensure modal and canvas have proper dimensions === */

.whiteboard-modal .modal-content {
    max-width: 100vw;
    height: 100vh;
    width: 100vw;
    border-radius: 0;
    box-shadow: none;
    max-height: 100vh;
    height: 100vh; /* ADD THIS - force height */
    display: flex;
    flex-direction: column;
}

.whiteboard-modal .modal-body {
    padding: 0;
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
    min-height: 0; /* ADD THIS - critical for flex children */
}

.whiteboard-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: var(--color-bg-primary);
    min-height: 0; /* ADD THIS */
}

.whiteboard-canvas-area {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--color-bg-primary);
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 20px 20px;
    min-height: 400px; /* ADD THIS - fallback minimum */
}


/* Floating close button for full screen */
.whiteboard-close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    color: var(--color-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.whiteboard-close-btn:hover {
    background-color: var(--color-accent);
    color: white;
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.whiteboard-close-btn:active {
    transform: scale(0.95);
}

/* Tooltip for close button */
.whiteboard-close-btn::after {
    content: attr(aria-label);
    position: absolute;
    top: calc(100% + 8px);
    bottom: auto;
    right: 0;
    background-color: var(--color-text-primary);
    color: var(--color-bg-primary);
    padding: var(--space-xs) var(--space-md);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-fast);
    transform: translateY(-4px);
}

.whiteboard-close-btn:hover::after {
    opacity: 1;
    transform: translateY(0);
}

/* Full screen modal overlay - subtle */
.whiteboard-modal .modal-overlay {
    background-color: transparent; /* No overlay for full screen */
}

/* Ensure modal takes entire viewport */
.whiteboard-modal {
    padding: 0;
    margin: 0;
}

/* High-DPI (Retina) display optimizations */
.whiteboard-canvas {
    /* Smooth, high-quality rendering for drawing */
    image-rendering: auto;
    image-rendering: high-quality;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    
    /* Force hardware acceleration for smooth performance */
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    will-change: transform;
    
    /* High-quality text and shape rendering */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}