/* ===== whiteboard-app.css ===== */
/* Whiteboard size indicator, whiteboard settings modal, */
/* background image selector, full-screen background system */

/* ===== WHITEBOARD SIZE VALUE INDICATOR CSS ===== */
/* Add this to whiteboard.css */

.whiteboard-size-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-primary);
    font-family: var(--font-mono);
    min-width: 24px;
    text-align: center;
    background-color: var(--color-bg-tertiary);
    padding: 2px 8px;
    border-radius: 4px;
}

.compression-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.compression-option {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.compression-option:hover {
    border-color: var(--color-accent);
    background-color: var(--color-bg-tertiary);
}

.compression-option input[type="radio"] {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.compression-option input[type="radio"]:checked + .option-content {
    color: var(--color-accent);
}

.compression-option .option-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.compression-option .option-content strong {
    font-size: 14px;
    color: var(--color-text-primary);
}

.compression-option .option-content span {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.settings-info {
    padding: var(--space-md);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    color: var(--color-text-secondary);
}

.image-processing {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--space-lg);
}

.processing-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.compression-stats {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background-color: #d1fae5;
    border: 1px solid #6ee7b7;
    border-radius: var(--border-radius-sm);
    margin-top: var(--space-md);
    font-size: 13px;
}

[data-theme="dark"] .compression-stats {
    background-color: rgba(16, 185, 129, 0.2);
    border-color: rgba(16, 185, 129, 0.4);
}

.stats-icon {
    width: 24px;
    height: 24px;
    background-color: var(--color-success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.stats-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stats-content strong {
    color: var(--color-text-primary);
    font-size: 14px;
}

.stats-content span {
    color: var(--color-text-secondary);
    font-size: 12px;
}


/* ===== Whiteboard Settings Modal Styles ===== */
.fixed-colors-display {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.color-preview-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.color-preview-box {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-sm);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.color-preview-item span {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.custom-colors-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.custom-color-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.custom-color-item input[type="color"] {
    width: 100%;
    height: 64px;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.custom-color-item input[type="color"]:hover {
    border-color: var(--color-accent);
    transform: scale(1.05);
}

.custom-color-item label {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
    text-align: center;
}

.color-presets {
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

.default-tool-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.tool-radio-option {
    cursor: pointer;
}

.tool-radio-option input[type="radio"] {
    display: none;
}

.tool-radio-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background-color: var(--color-bg-tertiary);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
}

.tool-radio-option:hover .tool-radio-content {
    background-color: var(--color-bg-hover);
    border-color: var(--color-accent);
}

.tool-radio-option input[type="radio"]:checked + .tool-radio-content {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.tool-radio-content svg {
    width: 32px;
    height: 32px;
}

.tool-radio-content span {
    font-size: 14px;
    font-weight: 600;
}

/* Background Pattern Selector */
.background-pattern-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.pattern-radio-option {
    cursor: pointer;
}

.pattern-radio-option input[type="radio"] {
    display: none;
}

.pattern-radio-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background-color: var(--color-bg-tertiary);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
}

.pattern-radio-option:hover .pattern-radio-content {
    background-color: var(--color-bg-hover);
    border-color: var(--color-accent);
}

.pattern-radio-option input[type="radio"]:checked + .pattern-radio-content {
    background-color: var(--color-accent-light);
    border-color: var(--color-accent);
}

.pattern-preview {
    width: 80px;
    height: 80px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background-color: var(--bg-secondary);
    position: relative;
}

[data-theme="dark"] .pattern-preview {
    background-color: var(--bg-primary);
}

/* Pattern Preview Styles */
.blank-preview {
    /* Just solid color */
}

.grid-preview {
    background-image: 
        linear-gradient(to right, #e5e7eb 1px, transparent 1px),
        linear-gradient(to bottom, #e5e7eb 1px, transparent 1px);
    background-size: 20px 20px;
}

[data-theme="dark"] .grid-preview {
    background-image: 
        linear-gradient(to right, #374151 1px, transparent 1px),
        linear-gradient(to bottom, #374151 1px, transparent 1px);
}

.dots-preview {
    background-image: radial-gradient(circle, #9ca3af 1.5px, transparent 1.5px);
    background-size: 20px 20px;
}

[data-theme="dark"] .dots-preview {
    background-image: radial-gradient(circle, #4b5563 1.5px, transparent 1.5px);
}

.lines-preview {
    background-image: linear-gradient(to bottom, #93c5fd 1px, transparent 1px);
    background-size: 100% 24px;
}

[data-theme="dark"] .lines-preview {
    background-image: linear-gradient(to bottom, #1e40af 1px, transparent 1px);
}

.pattern-radio-content span {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.pattern-radio-option input[type="radio"]:checked + .pattern-radio-content span {
    color: var(--color-accent);
}

/* Pattern Color Options */
.pattern-color-options {
    display: flex;
    gap: 1rem;
}

.color-radio-option {
    flex: 1;
    cursor: pointer;
}

.color-radio-option input[type="radio"] {
    display: none;
}

.color-radio-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background-color: var(--color-bg-tertiary);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-base);
}

.color-radio-option:hover .color-radio-content {
    background-color: var(--color-bg-hover);
    border-color: var(--color-accent);
}

.color-radio-option input[type="radio"]:checked + .color-radio-content {
    border-color: var(--color-accent);
    background-color: var(--color-accent-light);
}

.color-radio-swatch {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    flex-shrink: 0;
}

.color-radio-content span {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
}
/* ===== Background Image Selector ===== */
.background-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--space-md);
}

.background-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.background-preview {
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: var(--border-radius);
    border: 3px solid var(--color-border);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    background-size: cover;
    background-position: center;
}

.background-preview svg {
    color: var(--color-text-tertiary);
    position: relative;
    z-index: 2;
}

/* Background type placeholders with subtle colors */

.background-option.active .background-preview {
    border-color: var(--color-accent);
    box-shadow: 
        0 0 0 2px var(--color-bg-secondary),
        0 0 0 5px var(--color-accent),
        0 4px 12px rgba(0, 0, 0, 0.15);
}

.background-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-align: center;
}

.background-option.active .background-label {
    color: var(--color-accent);
    font-weight: 600;
}


/* Custom background upload button */
.background-option#customBackgroundBtn .background-preview {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.background-option#customBackgroundBtn svg {
    color: white;
    opacity: 0.9;
}

.background-option#customBackgroundBtn:hover svg {
    opacity: 1;
    transform: translateY(-2px);
    transition: all 0.2s ease;
}

/* When custom background is uploaded, show it like other presets */
.background-option#customBackgroundBtn.has-custom .background-preview {
    background: none !important;
    background-size: cover !important;
    background-position: center !important;
}

.background-option#customBackgroundBtn.has-custom svg {
    display: none;
}

/* Custom background applied to page */
[data-background="custom"]::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: var(--bg-image);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 1;
    z-index: -1;
    pointer-events: none;
    
    /* Performance optimizations - GPU acceleration */
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Hide custom backgrounds completely while the full-screen whiteboard is active. */
html.whiteboard-active[data-background="custom"]::before {
    display: none;
}

/* Apply background image to main content with subtle opacity */





/* Dark theme backgrounds - use darker overlay */











/* Dark theme backgrounds */







/* ===== Full-Screen Background System ===== */

/* Apply backgrounds to html for full-screen coverage */
html[data-background="chalkboard"] {
    background-image: url("/images/bboard.jpg");
    background-attachment: fixed;
    background-size: cover;
    
    /* Performance optimizations */
    transform: translateZ(0);
    backface-visibility: hidden;
}

html[data-background="classroom"] {
    background-image: url("/images/classroom.jpg");
    background-attachment: fixed;
    background-size: cover;
    
    /* Performance optimizations */
    transform: translateZ(0);
    backface-visibility: hidden;
}

html[data-background="nature"] {
    background-image: url("/images/nature.jpg");
    background-attachment: fixed;
    background-size: cover;
    
    /* Performance optimizations */
    transform: translateZ(0);
    backface-visibility: hidden;
}

html[data-background="library"] {
    background-image: url("/images/library.jpg");
    background-attachment: fixed;
    background-size: cover;
    
    /* Performance optimizations */
    transform: translateZ(0);
    backface-visibility: hidden;
}

html[data-background="space"] {
    background-image: url("/images/space.jpg");
    background-attachment: fixed;
    background-size: cover;
    
    /* Performance optimizations */
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Hide preset backgrounds while the full-screen whiteboard is active. */
html.whiteboard-active[data-background]:not([data-background="none"]) {
    background-image: none !important;
}

/*
 * The whiteboard covers the viewport, so blurring the hidden lesson beneath it
 * only adds full-screen compositor work to every canvas frame.
 */
html.whiteboard-active .whiteboard-modal .modal-overlay,
html.whiteboard-active .whiteboard-modal .modal-content {
    -webkit-backdrop-filter: none !important;
    backdrop-filter: none !important;
}

/* Make body transparent when background is active */
html[data-background]:not([data-background="none"]) body {
    background-color: transparent;
}

/* UNIFIED TRANSPARENCY - All elements use same blur and opacity */
/* Sidebar - transparent background */
html[data-background]:not([data-background="none"]) .sidebar {
    background-color: var(--surface-glass);
    backdrop-filter: blur(0px);
}

html[data-theme="dark"][data-background]:not([data-background="none"]) .sidebar {
    background-color: var(--surface-glass);
    backdrop-filter: blur(0px);
}

/* Slide menu - consistent frosted glass */
html[data-background]:not([data-background="none"]) .slide-menu {
    background-color: var(--surface-glass);
    backdrop-filter: blur(0px);
}

html[data-theme="dark"][data-background]:not([data-background="none"]) .slide-menu {
    background-color: var(--surface-glass);
    backdrop-filter: blur(0px);
}

/* Messages area - consistent frosted glass */
html[data-background]:not([data-background="none"]) .messages-container {
    background-color: var(--surface-glass);
    backdrop-filter: blur(0px);
}

html[data-theme="dark"][data-background]:not([data-background="none"]) .messages-container {
    background-color: var(--surface-glass);
    backdrop-filter: blur(0px);
}

/* Input container - consistent frosted glass (FIXED!) */
html[data-background]:not([data-background="none"]) .input-container {
    background-color: var(--surface-glass) !important;
    backdrop-filter: blur(0px);
    border-top: 0px solid rgba(255, 255, 255, 0.3);
}

html[data-theme="dark"][data-background]:not([data-background="none"]) .input-container {
    background-color: var(--surface-glass) !important;
    backdrop-filter: blur(0px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}





/* Welcome message - transparent */
html[data-background]:not([data-background="none"]) .welcome-message {
    background-color: transparent;
}

/* Page navigation - make transparent too */
html[data-background]:not([data-background="none"]) .page-nav {
    background-color: transparent;
}

/* Make sure modals also get the frosted glass effect */
html[data-background]:not([data-background="none"]) .modal-content {
    background-color: var(--surface-glass-strong);
    backdrop-filter: blur(20px);
}

html[data-theme="dark"][data-background]:not([data-background="none"]) .modal-content {
    background-color: var(--surface-glass-strong);
    backdrop-filter: blur(20px);
}

.background-preview::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.15);
    pointer-events: none;
}