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

:root {
    --primary-bg: #0a0a0a;
    --secondary-bg: #1a1a1a;
    --accent-bg: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #888888;
    --accent-color: #00ff88;
    --accent-hover: #00cc6a;
    --border-color: #333333;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-accent: linear-gradient(135deg, #00ff88 0%, #00aa55 100%);
    --shadow-main: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-light: 0 4px 16px rgba(0, 0, 0, 0.2);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 2px;
}

.language-switcher {
    display: flex;
    gap: 0.5rem;
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.lang-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-1px);
}

.lang-btn.active {
    background: var(--accent-color);
    color: var(--primary-bg);
    border-color: var(--accent-color);
    font-weight: 600;
}

.main-content {
    margin-top: 70px;
    padding: 2rem;
}

.neural-numbers {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 0;
    text-align: center;
}

.section-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.section-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem;
    line-height: 1.8;
}

.interactive-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
    align-items: start;
}

.canvas-section {
    text-align: center;
}

.canvas-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.canvas-instructions {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-style: italic;
}

.canvas-container {
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-main);
    transition: all 0.3s ease;
}

.canvas-container:hover {
    border-color: var(--accent-color);
    box-shadow: 0 8px 32px rgba(0, 255, 136, 0.1);
}

#drawingCanvas {
    background: white;
    border-radius: 8px;
    cursor: crosshair;
    display: block;
    margin: 0 auto;
    box-shadow: var(--shadow-light);
}

.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn-clear {
    background: var(--accent-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-clear:hover {
    background: var(--border-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.btn-predict {
    background: var(--gradient-accent);
    color: var(--primary-bg);
    font-weight: 700;
}

.btn-predict:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 255, 136, 0.3);
}

.btn-predict:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
}

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

.model-selector {
    text-align: center;
}

.model-selector label {
    display: block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

#modelSelect {
    background: var(--secondary-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 250px;
}

#modelSelect:hover {
    border-color: var(--accent-color);
}

#modelSelect:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.1);
}

.results-section {
    text-align: center;
}

.results-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.confidence-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.confidence-bar {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.confidence-bar:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.confidence-bar.winner {
    border-color: var(--accent-color);
    background: rgba(0, 255, 136, 0.1);
}

.confidence-bar.pulse {
    animation: pulse 1.5s ease-in-out;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.digit-label {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.confidence-percentage {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.progress-bar {
    height: 60px;
    background: var(--accent-bg);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    width: 100%;
    height: 100%;
    background: var(--gradient-accent);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 4px;
}

.status-display {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
}

.prediction-result {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.prediction-confidence {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

@media (max-width: 768px) {
    .header {
        padding: 0 1rem;
    }
    
    .nav {
        height: 60px;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .main-content {
        margin-top: 60px;
        padding: 1rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .section-description {
        font-size: 1rem;
    }
    
    .interactive-area {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .confidence-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }
    
    .confidence-bar {
        padding: 0.75rem;
    }
    
    .progress-bar {
        height: 40px;
    }
    
    .controls {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 2rem;
    }
    
    .canvas-container {
        padding: 1rem;
    }
    
    #drawingCanvas {
        width: 240px;
        height: 240px;
    }
    
    .confidence-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .confidence-bar {
        padding: 0.5rem;
    }
    
    .digit-label {
        font-size: 1rem;
    }
    
    .confidence-percentage {
        font-size: 0.8rem;
    }
    
    .progress-bar {
        height: 30px;
    }
}