/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg) 0%, #1a1a2e 50%, var(--bg) 100%);
    background-attachment: fixed;
    height: 100vh;
    width: 100vw;
    color: var(--text);
    line-height: 1.6;
    overflow: hidden;
    transition: all 0.3s var(--easing);
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 80%, var(--accent-glow) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, var(--accent-2) 0%, transparent 50%);
    opacity: 0.1;
    pointer-events: none;
    z-index: -1;
}

:root {
    /* Dark Theme Colors */
    --bg: #0a0a0a;
    --surface: #1a1a1a;
    --surface-2: #2a2a2a;
    --surface-3: #3a3a3a;
    --border: #404040;
    --border-light: #2a2a2a;
    --text: #ffffff;
    --text-secondary: #e5e5e5;
    --muted: #a0a0a0;
    --muted-dark: #666666;
    
    /* Accent Colors with Glow Effects - Blue Theme */
    --accent: #3b82f6;
    --accent-2: #1d4ed8;
    --accent-3: #60a5fa;
    --accent-4: #93c5fd; /* lighter */
    --accent-5: #bfdbfe; /* lightest */
    --accent-glow: rgba(59, 130, 246, 0.3);
    --accent-glow-strong: rgba(59, 130, 246, 0.5);
    --accent-glow-intense: rgba(59, 130, 246, 0.7);
    
    /* Status Colors - Blue Variations */
    --success: #22c55e;
    --success-glow: rgba(34, 197, 94, 0.3);
    --warning: #f59e0b;
    --warning-glow: rgba(245, 158, 11, 0.3);
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.3);
    
    /* Animation Easing */
    --easing: cubic-bezier(0.4, 0, 0.2, 1);
    --easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --easing-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px var(--accent-glow);
}

.container {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-rows: auto 1fr auto;
}

/* Main Section */
.main-section {
    width: 100%;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

/* Bottom Section */
.bottom-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    background: transparent;
    border-top: 1px solid var(--border);
}

/* Header Styles */
.header {
    position: relative;
    text-align: center;
    padding: 16px 20px;
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    color: var(--text);
    transition: all 0.3s var(--easing);
    box-shadow: var(--shadow-sm);
}

.title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--text);
    background: linear-gradient(135deg,
        var(--accent-2) 0%,
        var(--accent-2) 45%,
        var(--accent-3) 50%,
        var(--accent-2) 55%,
        var(--accent-2) 100%
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleGlow 3s ease-in-out infinite alternate;
    transition: all 0.3s var(--easing);
}

.title:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 10px var(--accent-glow));
}

.subtitle {
    font-size: 0.95rem;
    opacity: 0.8;
    font-weight: 400;
    color: var(--text-secondary);
    transition: all 0.3s var(--easing);
}

@keyframes titleGlow {
    0% { filter: drop-shadow(0 0 5px var(--accent-glow)); }
    100% { filter: drop-shadow(0 0 15px var(--accent-glow-strong)); }
}

.header-actions {
    position: absolute;
    top: 10px;
    right: 16px;
    display: flex;
    gap: 8px;
}

/* Main Content Layout */
.main-content {
    display: grid;
    grid-template-columns: 380px 1fr 360px;
    gap: 0;
    flex: 1;
    align-items: stretch;
    height: 100%;
    padding: 0;
    min-height: 0;
}

/* Model Selector Container */
.model-selector-container {
    background: rgba(26, 26, 26, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 0;
    padding: 20px;
    height: 100%;
    overflow-y: auto;
    border-right: 1px solid var(--border);
    transition: all 0.3s var(--easing);
    box-shadow: var(--shadow-md);
}

/* Canvas Container */
.canvas-container {
    background: rgba(26, 26, 26, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 0;
    padding: 20px;
    text-align: center;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    height: 100%;
    border-right: 1px solid var(--border);
    transition: all 0.3s var(--easing);
    box-shadow: var(--shadow-md);
    gap: 30px;
}

/* Model Selector */
.model-selector {
    margin-bottom: 0;
    padding: 0;
    background: transparent;
    border: none;
}

.model-selector h3 {
    color: var(--text);
    margin-bottom: 10px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
}

.model-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 10px;
}

.model-card {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    cursor: pointer;
    transition: all 0.3s var(--easing);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 6px;
    aspect-ratio: 1;
    justify-content: center;
    min-height: 70px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.model-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s var(--easing);
}

.model-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-lg), 0 0 20px var(--accent-glow);
    background: var(--surface-3);
}

.model-card:hover::before {
    left: 100%;
}

.model-card.active {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    color: #ffffff;
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-lg), 0 0 25px var(--accent-glow-strong);
    animation: activePulse 2s ease-in-out infinite;
}

/* Compare mode selected look: blue border on all cards, neutral background */
.model-card.compare-selected {
    border-color: var(--accent);
    box-shadow: var(--shadow-md), 0 0 10px var(--accent-glow);
}

@keyframes activePulse {
    0%, 100% { box-shadow: var(--shadow-lg), 0 0 25px var(--accent-glow-strong); }
    50% { box-shadow: var(--shadow-lg), 0 0 35px var(--accent-glow-strong); }
}

.model-card h4 {
    font-size: 0.8rem;
    margin: 0;
    font-weight: 600;
    line-height: 1.2;
}

.model-card .model-stats {
    font-size: 0.72rem;
    color: var(--muted);
}

.model-info {
    background: var(--surface-2);
    padding: 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    font-size: 0.9rem;
    color: var(--muted);
}

.model-info:empty {
    display: none;
}

.model-info h4 {
    color: var(--text);
    margin: 0 0 8px 0;
    font-size: 1rem;
}

.model-info p {
    margin: 5px 0;
}

.canvas-wrapper {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0;
    border-radius: 0;
    border: none; /* remove gray frame around the canvas area */
    background: transparent;
}


#drawingCanvas {
    border: 3px solid var(--accent); /* blue border around canvas only */
    border-radius: 16px;
    cursor: crosshair;
    background: 
        linear-gradient(rgba(59, 130, 246, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.1) 1px, transparent 1px),
        #000000;
    background-size: 20px 20px;
    transition: all 0.3s var(--easing);
    width: 400px;
    height: 400px;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
    position: relative;
}

.canvas-instructions {
    margin-bottom: 16px; /* extra space between canvas and instructions */
    font-size: 0.9rem;
    color: var(--muted);
}

#drawingCanvas:hover {
    border-color: var(--accent-2);
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.5);
    transform: scale(1.02);
}

#drawingCanvas:active {
    transform: scale(0.98);
}


.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.canvas-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(99, 102, 241, 0.2);
    border-top: 4px solid var(--accent);
    border-right: 4px solid var(--accent-2);
    border-radius: 50%;
    animation: spin 1s linear infinite, glow 2s ease-in-out infinite alternate;
    margin: 0 auto 15px;
    box-shadow: 0 0 20px var(--accent-glow);
    position: relative;
}

.spinner::before {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border: 2px solid transparent;
    border-top: 2px solid var(--accent-glow);
    border-radius: 50%;
    animation: spin 2s linear infinite reverse;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Canvas Controls */
.canvas-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: flex-start;
    min-width: 200px;
}

.shortcut-hint {
    margin-top: -12px; /* sit right under the button */
    font-size: 0.75rem;
    color: var(--muted);
}

.preprocess-preview { 
    display: flex; 
    flex-direction: column;
    align-items: flex-start; 
    gap: 10px; 
    color: var(--muted); 
    width: 100%;
}
.preprocess-preview canvas { 
    border: 1px solid var(--border); 
    border-radius: 8px; 
    background: #000; 
    align-self: center;
}

.btn {
    padding: 12px 20px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--easing);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s var(--easing);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    color: #ffffff;
    border-color: var(--accent);
    box-shadow: var(--shadow-md), 0 0 15px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.05);
    background: linear-gradient(135deg, var(--accent-2) 0%, var(--accent) 100%);
    border-color: var(--accent-2);
    box-shadow: var(--shadow-lg), 0 0 25px var(--accent-glow-strong);
}

.btn-primary:active {
    transform: translateY(-1px) scale(1.02);
}

.btn-secondary {
    background: rgba(42, 42, 42, 0.8);
    color: var(--text);
    border-color: var(--border);
}

.btn-secondary:hover {
    transform: translateY(-3px) scale(1.05);
    border-color: var(--accent);
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent);
    box-shadow: var(--shadow-lg), 0 0 20px var(--accent-glow);
}

.btn-secondary:active {
    transform: translateY(-1px) scale(1.02);
}

.brush-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    width: 100%;
}

#brushSize {
    width: 120px;
    height: 6px;
    border-radius: 6px;
    background: var(--surface-3);
    outline: none;
    -webkit-appearance: none;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
    transition: all 0.3s var(--easing);
}

#brushSize:hover {
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3), 0 0 10px var(--accent-glow);
}

#brushSize::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    cursor: pointer;
    box-shadow: 0 0 15px var(--accent-glow), 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.3s var(--easing);
    border: 2px solid var(--surface);
}

#brushSize::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 20px var(--accent-glow-strong), 0 6px 12px rgba(0, 0, 0, 0.4);
}

#brushSize::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    cursor: pointer;
    border: 2px solid var(--surface);
    box-shadow: 0 0 15px var(--accent-glow), 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.3s var(--easing);
}

#brushSize::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 20px var(--accent-glow-strong), 0 6px 12px rgba(0, 0, 0, 0.4);
}

#brushSizeValue {
    font-weight: 600;
    color: var(--accent);
    min-width: 20px;
}

/* Prediction Container */
.prediction-container {
    background: rgba(26, 26, 26, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border);
    transition: all 0.3s var(--easing);
    box-shadow: var(--shadow-md);
}

/* Comparison Toggle */
.comparison-toggle {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

/* Model Prediction Header */
.model-prediction-header {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.model-prediction-header h3 {
    color: var(--text);
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
    width: 100%;
    text-align: center;
}

.model-prediction-header h3:empty {
    display: none;
}

/* Comparison View */
.comparison-view {
    margin-top: 20px;
}

.comparison-view h3 {
    color: #333;
    font-size: 1.3rem;
    margin-bottom: 20px;
    text-align: center;
    font-weight: 600;
}

.models-comparison {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.model-comparison-card {
    background: var(--surface-2);
    border-radius: 12px;
    padding: 12px;
    border: 1px solid var(--border);
    transition: all 0.3s var(--easing);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.model-comparison-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.6s var(--easing);
}

.model-comparison-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-lg), 0 0 20px var(--accent-glow);
}

.model-comparison-card:hover::before {
    left: 100%;
}

.model-comparison-card h4 {
    color: var(--text);
    font-size: 0.85rem;
    margin: 0 0 8px 0;
    font-weight: 600;
    text-align: center;
}

.model-comparison-prediction {
    text-align: center;
    margin-bottom: 10px;
}

.model-comparison-prediction .digit {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
    display: block;
    margin-bottom: 4px;
}

.model-comparison-prediction .confidence {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

.model-comparison-stats {
    font-size: 0.7rem;
    color: var(--muted);
    text-align: center;
}

.model-comparison-stats .stat {
    margin: 1px 0;
}

.prediction-header {
    padding: 15px 15px 0 15px;
    border-bottom: 1px solid var(--border);
}

.prediction-header h2 {
    color: var(--text);
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0 0 10px 0;
    text-align: center;
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    background: var(--surface-2);
    border-radius: 12px;
    padding: 6px;
    margin-bottom: 0;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.tab-button {
    flex: 1;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--muted);
    transition: all 0.3s var(--easing);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.tab-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s var(--easing);
}

.tab-button:hover::before {
    left: 100%;
}

.tab-button.active {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    color: #ffffff;
    box-shadow: var(--shadow-md), 0 0 15px var(--accent-glow);
    transform: translateY(-1px);
}

.tab-button:hover:not(.active) {
    color: var(--text);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

/* Tab Content */
.tab-content {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.confidence-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
}

.confidence-bar {
    width: 120px;
    height: 10px;
    background: var(--surface-3);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
}

.confidence-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shimmer 2s infinite;
}

.confidence-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    width: 0%;
    transition: width 0.6s var(--easing-bounce), background-color 0.3s var(--easing);
    position: relative;
    box-shadow: 0 0 15px var(--accent-glow);
}

.confidence-text {
    font-weight: 600;
    color: var(--accent);
    min-width: 40px;
}

/* Prediction Results */
.prediction-results {
    text-align: center;
    margin-bottom: 30px;
}

.prediction-item {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: var(--surface-2);
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transition: all 0.3s var(--easing);
    position: relative;
    overflow: hidden;
}

.prediction-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.8s var(--easing);
}

.prediction-item:hover::before {
    left: 100%;
}

.digit {
    font-size: 4rem;
    font-weight: 700;
    color: var(--accent);
    text-shadow: 0 0 20px var(--accent-glow);
    transition: all 0.3s var(--easing);
    animation: digitGlow 2s ease-in-out infinite alternate;
}

@keyframes digitGlow {
    0% { text-shadow: 0 0 20px var(--accent-glow); }
    100% { text-shadow: 0 0 30px var(--accent-glow-strong); }
}

.probability {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
}

/* Top Predictions */
.top-predictions h3 {
    color: var(--text);
    font-size: 1.1rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.predictions-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.prediction-row {
    display: grid;
    grid-template-columns: 30px 30px 1fr 50px;
    align-items: center;
    gap: 15px;
    padding: 14px 16px;
    background: var(--surface-2);
    border-radius: 12px;
    transition: all 0.3s var(--easing);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.prediction-row::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.6s var(--easing);
}

.prediction-row:hover {
    background: rgba(99, 102, 241, 0.1);
    transform: translateX(8px) scale(1.02);
    box-shadow: var(--shadow-md), 0 0 15px var(--accent-glow);
    border-color: var(--accent);
}

.prediction-row:hover::before {
    left: 100%;
}

.rank {
    font-weight: 600;
    color: var(--accent);
}

.prediction-row .digit {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
}

.probability-bar {
    height: 10px;
    background: var(--surface-3);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
}

.probability-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shimmer 2s infinite;
}

.probability-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    transition: width 0.5s var(--easing-bounce);
    position: relative;
    box-shadow: 0 0 10px var(--accent-glow);
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.percentage {
    font-weight: 600;
    color: var(--text);
    text-align: right;
}

/* Instructions */
.instructions { display: none; }

.instructions h3 { display: none; }

.instructions ol { display: none; }

.instructions li { display: none; }

/* Footer */
.footer {
    text-align: center;
    padding: 16px 20px;
    color: var(--muted);
    font-size: 0.9rem;
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border);
    transition: all 0.3s var(--easing);
}

.footer:hover {
    color: var(--text-secondary);
    background: rgba(26, 26, 26, 0.9);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 220px 1fr 300px;
    }
    
    #drawingCanvas {
        width: 350px;
        height: 350px;
    }
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .model-selector-container {
        order: 2;
    }
    
    .canvas-container {
        order: 1;
        flex-direction: column;
        gap: 20px;
    }
    
    .prediction-container {
        order: 3;
        grid-column: 1 / -1;
    }
    
    #drawingCanvas {
        width: 300px;
        height: 300px;
    }
    
    .canvas-controls {
        align-items: center;
        min-width: auto;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0;
    }
    
    .title {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .model-selector-container,
    .canvas-container,
    .prediction-container {
        padding: 15px;
        height: auto;
        border-radius: 0;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    
    .model-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
    
    .model-card {
        text-align: center;
    }
    
    .prediction-header {
        padding: 15px 15px 0 15px;
    }
    
    .tab-content {
        padding: 15px;
    }
    
    .prediction-item {
        flex-direction: column;
        gap: 15px;
    }
    
    .digit {
        font-size: 2.5rem;
    }
    
    .canvas-controls {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    #drawingCanvas {
        width: 250px;
        height: 250px;
    }
    
    .instructions {
        padding: 15px 20px;
    }
    
    .instructions h3 {
        font-size: 1.1rem;
    }
    
    .instructions li {
        font-size: 0.9rem;
    }
    
    .models-comparison {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .model-comparison-card {
        padding: 10px;
    }
    
    .model-comparison-prediction .digit {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .title {
        font-size: 2rem;
    }
    
    #drawingCanvas {
        width: 180px;
        height: 180px;
    }
    
    .canvas-container,
    .prediction-container {
        padding: 15px;
    }
    
    .prediction-row {
        grid-template-columns: 25px 25px 1fr 40px;
        gap: 10px;
        padding: 10px;
    }
    
    .prediction-row .digit {
        font-size: 1.2rem;
    }
    
    .models-comparison {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .model-comparison-card {
        padding: 8px;
    }
    
    .model-comparison-prediction .digit {
        font-size: 1.3rem;
    }
    
    .model-comparison-card h4 {
        font-size: 0.8rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s var(--easing);
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(30px) scale(0.95); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0) scale(1); 
    }
}

.slide-in-left {
    animation: slideInLeft 0.5s var(--easing);
}

@keyframes slideInLeft {
    from { 
        opacity: 0; 
        transform: translateX(-50px); 
    }
    to { 
        opacity: 1; 
        transform: translateX(0); 
    }
}

.slide-in-right {
    animation: slideInRight 0.5s var(--easing);
}

@keyframes slideInRight {
    from { 
        opacity: 0; 
        transform: translateX(50px); 
    }
    to { 
        opacity: 1; 
        transform: translateX(0); 
    }
}

.scale-in {
    animation: scaleIn 0.4s var(--easing-bounce);
}

@keyframes scaleIn {
    from { 
        opacity: 0; 
        transform: scale(0.8); 
    }
    to { 
        opacity: 1; 
        transform: scale(1); 
    }
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { 
        transform: scale(1); 
        box-shadow: 0 0 0 0 var(--accent-glow);
    }
    50% { 
        transform: scale(1.05); 
        box-shadow: 0 0 0 10px transparent;
    }
    100% { 
        transform: scale(1); 
        box-shadow: 0 0 0 0 transparent;
    }
}

.glow {
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from { 
        box-shadow: 0 0 20px var(--accent-glow);
    }
    to { 
        box-shadow: 0 0 30px var(--accent-glow-strong);
    }
}

/* Loading Animation */
.loading-dots {
    display: inline-block;
}

.loading-dots::after {
    content: '';
    animation: loadingDots 1.5s infinite;
}

@keyframes loadingDots {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}

/* Modal */
.modal { 
    position: fixed; 
    inset: 0; 
    display: none; 
    align-items: center; 
    justify-content: center; 
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal.active { 
    display: flex; 
    animation: modalFadeIn 0.3s var(--easing);
}

.modal-backdrop { 
    position: absolute; 
    inset: 0; 
    background: rgba(0, 0, 0, 0.8);
    animation: backdropFadeIn 0.3s var(--easing);
}

.modal-content { 
    position: relative; 
    z-index: 1; 
    width: min(600px, 92vw); 
    max-height: 80vh; 
    background: var(--surface); 
    border: 1px solid var(--border); 
    border-radius: 20px; 
    overflow: hidden; 
    animation: modalSlideIn 0.4s var(--easing-bounce);
    box-shadow: var(--shadow-xl), 0 0 50px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
}

.modal-header { 
    display: flex; 
    align-items: center; 
    justify-content: space-between; 
    padding: 20px 24px; 
    border-bottom: 1px solid var(--border);
    background: var(--surface-2);
}

.modal-header h3 { 
    margin: 0; 
    font-size: 1.2rem; 
    color: var(--text);
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-body { 
    padding: 24px; 
    color: var(--text-secondary); 
    overflow: auto; 
    background: var(--surface);
}

.modal-body ol { 
    padding-left: 20px; 
}

.modal-body li { 
    margin: 8px 0; 
    transition: all 0.3s var(--easing);
}

.modal-body li:hover {
    color: var(--accent);
    transform: translateX(5px);
}

.modal-close { 
    background: transparent; 
    border: 1px solid var(--border); 
    color: var(--muted); 
    border-radius: 10px; 
    padding: 8px 12px; 
    cursor: pointer; 
    transition: all 0.3s var(--easing);
    position: relative;
    overflow: hidden;
}

.modal-close::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s var(--easing);
}

.modal-close:hover { 
    color: var(--text); 
    border-color: var(--accent); 
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.05);
}

.modal-close:hover::before {
    left: 100%;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes backdropFadeIn {
    from { background: rgba(0, 0, 0, 0); }
    to { background: rgba(0, 0, 0, 0.8); }
}

@keyframes modalSlideIn { 
    from { 
        transform: translateY(-50px) scale(0.9); 
        opacity: 0; 
    } 
    to { 
        transform: translateY(0) scale(1); 
        opacity: 1; 
    } 
}

/* Error States */
.error {
    color: var(--text);
    background: rgba(239, 68, 68, 0.1);
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid rgba(239, 68, 68, 0.3);
    margin: 10px 0;
    box-shadow: var(--shadow-sm), 0 0 15px var(--danger-glow);
    backdrop-filter: blur(10px);
    animation: slideInLeft 0.5s var(--easing);
    position: relative;
    overflow: hidden;
}

.error::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(239, 68, 68, 0.1), transparent);
    transition: left 0.6s var(--easing);
}

.error:hover::before {
    left: 100%;
}

.success {
    color: var(--text);
    background: rgba(16, 185, 129, 0.1);
    padding: 12px 16px;
    border-radius: 12px;
    border: 1px solid rgba(16, 185, 129, 0.3);
    margin: 10px 0;
    box-shadow: var(--shadow-sm), 0 0 15px var(--success-glow);
    backdrop-filter: blur(10px);
    animation: slideInRight 0.5s var(--easing);
    position: relative;
    overflow: hidden;
}

.success::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(16, 185, 129, 0.1), transparent);
    transition: left 0.6s var(--easing);
}

.success:hover::before {
    left: 100%;
}