:root {
    --bg-color: #000;
    --text-color: #fff;
    --accent-color: #fff;
    --border-color: #fff;
    --shadow-color: rgba(255, 255, 255, 0.2);
    --game-bg: #000;
    --game-element: #fff;
    --game-line: #333;
}

.theme-modern {
    --bg-color: #1a1a2e;
    --text-color: #e94560;
    --accent-color: #0f3460;
    --border-color: #16213e;
    --shadow-color: rgba(233, 69, 96, 0.3);
    --game-bg: #0f0f23;
    --game-element: #e94560;
    --game-line: #1a1a3e;
}

.theme-neon {
    --bg-color: #0a0a0a;
    --text-color: #00ff87;
    --accent-color: #00d4ff;
    --border-color: #00ff87;
    --shadow-color: rgba(0, 255, 135, 0.5);
    --game-bg: #000;
    --game-element: #00ff87;
    --game-line: #004d29;
}

.theme-light {
    --bg-color: #f0f0f0;
    --text-color: #333;
    --accent-color: #666;
    --border-color: #333;
    --shadow-color: rgba(0, 0, 0, 0.2);
    --game-bg: #fff;
    --game-element: #333;
    --game-line: #ccc;
}

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

body {
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: 'Courier New', monospace;
    overflow: hidden;
    transition: background-color 0.3s ease;
}

#game-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#game-header {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 800px;
    margin-bottom: 20px;
}

#theme-toggle {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    color: var(--text-color);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    width: 44px;
    height: 44px;
    font-size: 22px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-weight: bold;
}

#theme-toggle:hover {
    transform: translateY(-50%) rotate(90deg);
    box-shadow: 0 0 15px var(--shadow-color);
    background: var(--accent-color);
}

#score-display {
    color: var(--text-color);
    font-size: 48px;
    font-weight: bold;
    text-shadow: 2px 2px 4px var(--shadow-color);
    letter-spacing: 4px;
    transition: color 0.3s ease;
}

#score-display .divider {
    margin: 0 30px;
    opacity: 0.5;
}

#game-canvas {
    border: 4px solid var(--border-color);
    background-color: var(--game-bg);
    box-shadow: 0 0 20px var(--shadow-color);
    transition: border-color 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

#overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-color);
    pointer-events: none;
    transition: color 0.3s ease;
}

#overlay h1 {
    font-size: 64px;
    margin-bottom: 20px;
    text-shadow: 4px 4px 8px var(--shadow-color);
    letter-spacing: 8px;
}

#overlay p {
    font-size: 20px;
    opacity: 0.7;
}

#mobile-controls {
    margin-top: 20px;
    color: var(--text-color);
    font-size: 16px;
    opacity: 0.6;
    display: none;
    transition: color 0.3s ease;
}

@media (max-width: 768px) {
    #score-display {
        font-size: 32px;
    }

    #score-display .divider {
        margin: 0 15px;
    }

    #theme-toggle {
        width: 36px;
        height: 36px;
        font-size: 18px;
    }

    #theme-toggle:hover {
        transform: translateY(-50%) rotate(90deg);
    }

    #overlay h1 {
        font-size: 48px;
        margin-bottom: 15px;
    }

    #overlay p {
        font-size: 16px;
    }

    #mobile-controls {
        display: block;
    }

    #game-canvas {
        border-width: 2px;
    }
}