#game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 25px;
    padding: 30px;
    border-radius: 10px;
    background-color: var(--dark-blue);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    max-width: 500px;
    margin: 50px auto;
    text-align: center;
    color: var(--white);
    position: relative;
    min-height: 450px;
}

#start-screen,
#game-end-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

#start-screen h2 {
    font-size: 2em;
    color: var(--light-blue);
}

.symbol-selection {
    display: flex;
    gap: 20px;
}

.symbol-btn {
    font-family: 'Press Start 2P', cursive;
    font-size: 3em;
    padding: 20px 30px;
    background: none;
    border: 3px solid var(--electric-blue);
    border-radius: 8px;
    color: var(--electric-blue);
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s, transform 0.2s;
}

.symbol-btn:hover {
    background-color: var(--electric-blue);
    color: var(--white);
    transform: scale(1.05);
}


#game-board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-template-rows: repeat(3, 100px);
    gap: 15px;
    width: auto;
    max-width: 350px;
    aspect-ratio: 1 / 1;
}

.cell {
    background-color: #3e3e3e;
    border: 3px solid var(--electric-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4em;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
    user-select: none;
    color: var(--white);
}

.cell:hover {
    background-color: #555;
}

.cell.X {
    color: var(--electric-blue);
}

.cell.O {
    color: var(--light-blue);
}

#turn-display {
    font-size: 1.5em;
    font-weight: bold;
    min-height: 1.5em;
    color: var(--white);
}

#end-message {
    font-size: 2em;
    font-weight: bold;
    color: var(--electric-blue);
}

#restart-btn {
    padding: 12px 25px;
    font-size: 1.1em;
    background-color: var(--electric-blue);
    color: var(--white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#restart-btn:hover {
    background-color: var(--light-blue);
}

.hidden {
    display: none !important;
}

@media (max-width: 600px) {
    #game-container {
        padding: 20px;
    }
    
    #start-screen h2 {
        font-size: 1.5em;
    }

    .symbol-btn {
        font-size: 2em;
        padding: 15px 25px;
    }

    #game-board {
        width: 90vw; 
        grid-template-columns: repeat(3, minmax(0, 1fr));
        grid-template-rows: repeat(3, minmax(0, 1fr));
        gap: 2vw; 
    }

    .cell {
        font-size: 15vw;
        border-width: 2px;
    }
    
    #turn-display {
        font-size: 1.2em;
    }

    #end-message {
        font-size: 1.5em;
    }
}