:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --success-color: #10b981;
    --bg-color: #0f172a;
    --dark-bg: #1e293b;
    --card-bg: #1e293b;
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: linear-gradient(135deg, var(--bg-color) 0%, #1a1f3a 100%);
    color: var(--text-color);
    min-height: 100vh;
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

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

h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.ai {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.game-container {
    position: relative;
    background: var(--dark-bg);
    border-radius: 15px;
    padding: 1rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
}

#pongCanvas {
    display: block;
    background: #000;
    border-radius: 10px;
    max-width: 100%;
    height: auto;
}

.game-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 10;
}

.game-overlay.hidden {
    display: none;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

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

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

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

.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.info-panel {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.info-panel h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.progress-bar {
    width: 100%;
    height: 30px;
    background: var(--dark-bg);
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--success-color), var(--primary-color));
    transition: width 0.3s ease;
}

.info-text {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.loss-display {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--dark-bg);
    border-radius: 10px;
    margin-top: 1rem;
}

.loss-label {
    color: var(--text-secondary);
    font-weight: 600;
}

.loss-value {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--text-color);
}

.back-nav {
    text-align: center;
    margin-top: 2rem;
}

.back-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: rgba(99, 102, 241, 0.15);
    color: var(--text-color);
    text-decoration: none;
    border-radius: 10px;
    border: 2px solid var(--primary-color);
    transition: all 0.3s ease;
    font-weight: 600;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

.back-btn:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    .stats-panel {
        grid-template-columns: repeat(2, 1fr);
    }

    .control-group {
        flex-direction: column;
    }
}