/* Enhanced QMB Letter Tracing - Component-Specific Styles
 * File: /qmbportal/quizzes/assets/css/letter-tracing.css
 * 
 * CLEAN VERSION - All CSS variables moved to utilities.css
 * IMPROVEMENTS:
 * - Removed duplicate variables
 * - Added GPU acceleration for animations
 * - Enhanced mobile touch handling
 * - Better accessibility support
 * - Performance optimizations
 */

/* Import consolidated utilities with all variables */
@import url('components/utilities.css');
@import url('components/header.css');
@import url('components/modal.css');

/* Additional Google Fonts for letter tracing */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@300;400;500;600;700&display=swap');

/* COMPONENT-SPECIFIC STYLES ONLY */

/* Body styling for letter tracing page */
body {
    background: linear-gradient(135deg, #112167 0%, #2c3e50 100%);
    min-height: 100vh;
    padding: var(--spacing-xl);
    
    /* Enhanced mobile scrolling */
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    scroll-behavior: smooth;
}

/* Main container with performance optimizations */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    position: relative;
    
    /* GPU acceleration */
    will-change: transform;
    transform: translateZ(0);
}

.container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, 
        var(--primary-blue), 
        var(--accent-pink), 
        var(--accent-green), 
        var(--accent-orange)
    );
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
}

/* Main tracing application container */
.tracing-app {
    padding: var(--spacing-lg);
    background: var(--trace-bg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    min-height: 70vh;
    
    /* Performance optimizations */
    contain: layout style paint;
    will-change: scroll-position;
}

/* Loading spinner with GPU acceleration */
.loading-spinner {
    border: 4px solid #e5e7eb;
    border-top: 4px solid var(--trace-path-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    margin: var(--spacing-2xl) auto;
    transition: opacity var(--transition-slow);
    
    /* GPU accelerated animation */
    animation: spin 1s linear infinite;
    will-change: transform;
}

/* Character selector with enhanced scrolling */
#character-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    max-height: 200px;
    overflow-y: auto;
    
    /* Enhanced scrolling */
    scrollbar-width: thin;
    scrollbar-color: #d1d5db #f3f4f6;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

#character-selector::-webkit-scrollbar {
    width: 6px;
}

#character-selector::-webkit-scrollbar-track {
    background: #f3f4f6;
    border-radius: 3px;
}

#character-selector::-webkit-scrollbar-thumb {
    background: #d1d5db;
    border-radius: 3px;
    transition: background var(--transition-fast);
}

#character-selector::-webkit-scrollbar-thumb:hover {
    background: #9ca3af;
}

/* Character buttons with enhanced touch support */
.char-button {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    width: 50px;
    height: 50px;
    border: 2px solid #e5e7eb;
    border-radius: var(--radius-md);
    cursor: pointer;
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    transition: all var(--transition-normal);
    position: relative;
    color: #374151;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    
    /* Enhanced touch handling */
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    
    /* GPU acceleration for transforms */
    will-change: transform;
    transform: translateZ(0);
    
    /* Accessibility */
    min-height: 44px;
    min-width: 44px;
}

.char-button:hover {
    transform: translateY(-3px) scale(1.05);
    border-color: var(--trace-path-color);
    box-shadow: var(--shadow-lg);
    background: var(--button-hover-bg);
}

.char-button:active {
    transform: translateY(-1px) scale(1.02);
    transition: all var(--transition-fast);
}

.char-button.active {
    background: var(--button-active-bg);
    border-color: #d97706;
    box-shadow: var(--shadow-lg);
    color: #92400e;
    transform: translateY(-2px);
}

.char-button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.5);
    border-color: var(--primary-blue);
}

.char-button:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Mastery badges with optimized animations */
.mastery-badge {
    position: absolute;
    bottom: -3px;
    right: -3px;
    font-size: 0.65rem;
    font-weight: 900;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    
    /* GPU accelerated animation */
    animation: badgePop 0.3s ease;
    will-change: transform;
}

@keyframes badgePop {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.mastery-badge.mastered {
    background: linear-gradient(135deg, var(--trace-success-color) 0%, #059669 100%);
}

.mastery-badge.expert {
    background: linear-gradient(135deg, #fbbf24 0%, #d97706 100%);
    animation: expertGlow 2s ease-in-out infinite alternate;
}

.mastery-badge.progress {
    background: linear-gradient(135deg, var(--trace-warning-color) 0%, #d97706 100%);
}

@keyframes expertGlow {
    0% { box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2); }
    100% { box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2), 0 0 15px rgba(251, 191, 36, 0.5); }
}

/* Canvas container with enhanced touch handling */
.canvas-container {
    width: 100%;
    max-width: var(--canvas-max-size);
    margin: 0 auto;
    aspect-ratio: 1 / 1;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: var(--radius-lg);
    box-shadow: 
        inset 0 2px 4px rgba(0, 0, 0, 0.06),
        var(--shadow-lg);
    position: relative;
    overflow: hidden;
    border: 3px solid #e5e7eb;
    transition: all var(--transition-normal);
    
    /* Critical for touch drawing */
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    
    /* GPU acceleration */
    will-change: transform;
    transform: translateZ(0);
}

.canvas-container:hover {
    border-color: var(--trace-path-color);
    box-shadow: 
        inset 0 2px 4px rgba(0, 0, 0, 0.06),
        var(--shadow-xl);
}

/* Canvas with optimized drawing performance */
#tracing-canvas {
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    border-radius: var(--radius-md);
    transition: cursor var(--transition-fast);
    
    /* Performance optimizations */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: optimize-contrast;
    -ms-interpolation-mode: nearest-neighbor;
    
    /* Touch handling */
    touch-action: none;
    -webkit-touch-callout: none;
}

#tracing-canvas:active {
    cursor: grabbing;
}

/* Controls section with enhanced layout */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    
    /* GPU acceleration */
    will-change: transform;
    transform: translateZ(0);
}

/* Character type selector */
.char-type-selector {
    display: flex;
    gap: var(--spacing-xs);
    background: #f3f4f6;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.char-type-selector .control-button {
    margin: 0;
    box-shadow: none;
    border-radius: var(--radius-sm);
}

.char-type-selector .control-button.active {
    background: var(--button-active-bg);
    color: #92400e;
    box-shadow: var(--shadow-sm);
}

/* Control buttons with enhanced accessibility */
.control-button {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    border: none;
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    color: #374151;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font-primary);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    user-select: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    
    /* Enhanced touch handling */
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
    
    /* GPU acceleration */
    will-change: transform;
    transform: translateZ(0);
}

.control-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: var(--button-hover-bg);
}

.control-button:active {
    transform: translateY(0);
    transition: all var(--transition-fast);
}

.control-button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.5);
}

.control-button:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Action buttons */
.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    min-width: 120px;
    justify-content: center;
}

.action-btn:hover {
    background: linear-gradient(135deg, var(--trace-path-color) 0%, #2563eb 100%);
    color: white;
}

/* Success animation for canvas */
.canvas-container.success {
    animation: successPulse 0.6s ease-in-out;
    border-color: var(--trace-success-color);
}

@keyframes successPulse {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.05); opacity: 1; }
    100% { transform: scale(1); opacity: 0.8; }
}

/* Loading state */
.tracing-app.loading {
    pointer-events: none;
    opacity: 0.7;
}

.tracing-app.loading .loading-spinner {
    display: block;
}

/* Disabled button states */
.control-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    pointer-events: none;
}

.control-button:disabled:hover {
    transform: none;
    box-shadow: var(--shadow-md);
}

/* RESPONSIVE DESIGN - Mobile-first approach */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-md);
    }
    
    .tracing-app {
        padding: var(--spacing-md);
        gap: var(--spacing-md);
    }
    
    #character-selector {
        grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
        max-height: 150px;
        gap: var(--spacing-xs);
    }
    
    .char-button {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .canvas-container {
        max-width: 100%;
        margin: var(--spacing-sm) 0;
    }
    
    .controls {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .char-type-selector {
        width: 100%;
        justify-content: center;
    }
    
    .action-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .control-button {
        flex: 1;
        min-width: 100px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .char-button {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
    
    .mastery-badge {
        width: 18px;
        height: 18px;
        font-size: 0.6rem;
    }
    
    .control-button {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .tracing-app {
        min-height: 60vh;
    }
    
    #character-selector {
        grid-template-columns: repeat(auto-fit, minmax(45px, 1fr));
        max-height: 120px;
    }
}

/* ACCESSIBILITY ENHANCEMENTS */

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .char-button:hover,
    .control-button:hover {
        transform: none;
    }
    
    .mastery-badge {
        animation: none;
    }
    
    .canvas-container.success {
        animation: none;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .char-button {
        border-width: 3px;
    }
    
    .char-button.active {
        border-color: #000;
        color: #000;
    }
    
    .control-button:focus,
    .char-button:focus {
        outline-width: 3px;
        outline-style: solid;
    }
    
    .canvas-container {
        border-width: 4px;
        border-color: #000;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .tracing-app {
        background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
        color: #f9fafb;
    }
    
    .char-button,
    .control-button {
        background: linear-gradient(135deg, #374151 0%, #4b5563 100%);
        color: #f9fafb;
        border-color: #6b7280;
    }
    
    #character-selector,
    .controls {
        background: rgba(55, 65, 81, 0.9);
    }
    
    .canvas-container {
        background: linear-gradient(135deg, #f9fafb 0%, #e5e7eb 100%);
        border-color: #6b7280;
    }
}

/* Print styles */
@media print {
    .tracing-app {
        box-shadow: none;
        background: white;
    }
    
    .controls,
    #character-selector {
        display: none;
    }
    
    .canvas-container {
        max-width: 100%;
        box-shadow: none;
        border: 2px solid #000;
    }
}

/* Focus trap utility for modals */
.focus-trap {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    z-index: var(--z-modal-backdrop);
}

/* Screen reader announcements */
.sr-announce {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Touch feedback for mobile */
@media (hover: none) and (pointer: coarse) {
    .char-button:active,
    .control-button:active {
        background: var(--button-active-bg);
        transform: scale(0.95);
    }
}