* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main Layout */
main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
}

/* Canvas Section */
.canvas-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.canvas-container {
    position: relative;
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1rem;
    box-shadow: var(--shadow-lg);
}

#drawCanvas {
    display: block;
    background: #000000;
    border-radius: 8px;
    cursor: crosshair;
    touch-action: none;
}

.canvas-overlay {
    position: absolute;
    top: 1rem;
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    border-radius: 8px;
    transition: opacity 0.3s ease;
}

.canvas-overlay span {
    color: rgba(255, 255, 255, 0.4);
    font-size: 1.2rem;
    font-weight: 500;
}

.canvas-overlay.hidden {
    opacity: 0;
}

.button-group {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-primary:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--background);
    border-color: var(--secondary-color);
}

/* Result Section */
.result-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.result-card,
.probabilities-card,
.preview-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.result-card h2 {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-align: center;
}

.prediction-display {
    text-align: center;
    margin-bottom: 1rem;
}

.prediction-number {
    font-size: 5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.confidence-display {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

#confidenceResult {
    font-weight: 600;
    color: var(--success-color);
}

/* Probability Bars */
.probabilities-card h3,
.preview-card h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.probability-bars {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.probability-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.probability-label {
    width: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.probability-bar-container {
    flex: 1;
    height: 20px;
    background: var(--background);
    border-radius: 4px;
    overflow: hidden;
}

.probability-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #818cf8);
    border-radius: 4px;
    transition: width 0.3s ease;
    min-width: 0;
}

.probability-bar.highlight {
    background: linear-gradient(90deg, var(--success-color), #34d399);
}

.probability-value {
    width: 3.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: right;
}

/* Preview Canvas */
.preview-card {
    text-align: center;
}

#previewCanvas {
    width: 112px;
    height: 112px;
    background: #000;
    border-radius: 8px;
    image-rendering: pixelated;
    border: 2px solid var(--border-color);
}

/* Footer */
footer {
    margin-top: 3rem;
    text-align: center;
}

.status {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--secondary-color);
}

.status-dot.loading {
    background: #f59e0b;
    animation: pulse 1.5s infinite;
}

.status-dot.ready {
    background: var(--success-color);
}

.status-dot.error {
    background: #ef4444;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

#statusText {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.tech-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-card,
.probabilities-card,
.preview-card {
    animation: fadeIn 0.5s ease;
}