:root {
    --primary-color: #6a11cb;
    --secondary-color: #2575fc;
    --accent-color: #f80;
    --text-color: #fff;
    --background-dark: #0f0f1b;
    --background-light: #1a1a2e;
    --header-gradient: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    --button-gradient: linear-gradient(to right, #f06, #fc0);
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--background-dark);
    color: var(--text-color);
    font-family: 'Roboto', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(106, 17, 203, 0.1) 0%, rgba(37, 117, 252, 0.1) 100%),
        linear-gradient(to bottom, var(--background-dark), var(--background-light));
}

.game-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border-radius: 20px;
    overflow: hidden;
    background-color: rgba(26, 26, 46, 0.9);
    padding-bottom: 20px;
}

.game-header {
    display: flex;
    justify-content: space-between;
    padding: 15px 20px;
    margin-bottom: 10px;
    font-size: 22px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    background: var(--header-gradient);
    color: var(--text-color);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

canvas {
    background-color: var(--background-dark);
    border: 2px solid rgba(255, 255, 255, 0.1);
    display: block;
    margin: 0 auto;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    width: 600px;
    height: 800px;
    max-width: 100%;
    max-height: calc(100vh - 250px);
    object-fit: contain;
}

.game-controls {
    margin-top: 20px;
}

#startButton {
    background: var(--button-gradient);
    color: #fff;
    border: none;
    padding: 12px 30px;
    font-size: 20px;
    cursor: pointer;
    border-radius: 50px;
    margin-bottom: 15px;
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(255, 136, 0, 0.4);
    transition: all 0.3s ease;
}

#startButton:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 136, 0, 0.6);
}

#startButton:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px rgba(255, 136, 0, 0.4);
}

.instructions {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    background-color: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 10px;
    max-width: 80%;
    margin: 0 auto;
}

.instructions p {
    margin: 8px 0;
}

@media (max-width: 768px) {
    canvas {
        width: 450px;
        height: 600px;
        max-height: calc(100vh - 220px);
    }
}

@media (max-width: 600px) {
    .game-header {
        font-size: 18px;
        padding: 10px;
    }
    
    .instructions {
        font-size: 14px;
    }
    
    #startButton {
        font-size: 16px;
        padding: 10px 20px;
    }
    
    canvas {
        width: 320px;
        height: 427px;
        max-height: calc(100vh - 200px);
    }
}