:root {
    --bg-color: #f0f4f8;
    --main-color: #ffffff;
    --text-color: #2c3e50;
    --accent-color: #4a90e2;
    --button-color: #34495e;
    --button-text-color: #ecf0f1;
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-dark: 0 8px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.game-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 900px;
    width: 100%;
    padding: 20px;
    background-color: var(--main-color);
    border-radius: 15px;
    box-shadow: var(--shadow-dark);
}

.header {
    text-align: center;
    margin-bottom: 20px;
}

.header h1 {
    font-size: 1.5rem;
    color: var(--accent-color);
    text-shadow: var(--shadow-light);
    margin: 0;
    letter-spacing: 0.1rem;
}

.main-game-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.board-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
    width: 100%;
}

#gameCanvas {
    background-color: #2c3e50;
    border-radius: 10px;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.2);
    border: 5px solid var(--button-color);
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 180px;
    padding: 15px;
    background-color: #f4f6f8;
    border-radius: 10px;
    box-shadow: var(--shadow-light);
    text-align: center;
}

.info-box {
    padding: 10px;
    border-radius: 8px;
    background-color: var(--main-color);
    box-shadow: var(--shadow-light);
    border: 2px solid var(--accent-color);
    flex-grow: 1;
}

.info-box h3 {
    margin: 0 0 5px;
    font-size: 0.8rem;
}

.info-box p {
    font-size: 1rem;
    margin: 0;
}

.controls {
    display: none; /* Hide controls as requested by auto-start */
}

button {
    background-color: var(--button-color);
    color: var(--button-text-color);
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.8rem;
    cursor: pointer;
    transition: transform 0.1s, box-shadow 0.1s;
    box-shadow: var(--shadow-light);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-dark);
}

button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-light);
}

#messageBox {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(44, 62, 80, 0.9);
    color: white;
    padding: 40px 60px;
    border-radius: 15px;
    box-shadow: var(--shadow-dark);
    text-align: center;
    display: none;
    z-index: 100;
}

#messageBox h2 {
    font-size: 2rem;
    margin: 0 0 10px;
}

#messageBox p {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .game-container {
        flex-direction: column;
        padding: 10px;
    }
    
    .board-container {
        flex-direction: column-reverse;
        align-items: center;
    }
    
    .sidebar {
        width: 100%;
        flex-direction: row;
        justify-content: space-around;
        flex-wrap: wrap;
    }
    
    .header h1 {
        font-size: 1.2rem;
    }
    
    button {
        padding: 10px 20px;
        font-size: 0.7rem;
    }
}