body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #faf8ef;
}

.container {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.sidebar {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

h1 {
    font-size: 60px;
    margin: 0;
    color: #776e65;
}

.scoreboard {
    background-color: #bbada0;
    padding: 10px 20px;
    border-radius: 6px;
    color: white;
    text-align: center;
}

.scoreboard p {
    margin: 10px 0;
    font-size: 18px;
}

button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #8f7a66;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

button:hover {
    background-color: #9d8b7a;
}

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

#grid-container {
    width: 400px;
    height: 400px;
    background-color: #bbada0;
    border-radius: 10px;
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, 100px);
    grid-template-rows: repeat(4, 100px);
}

.grid-cell {
    width: 100px;
    height: 100px;
    background-color: #ccc0b3;
    border-radius: 6px;
}

.tile {
    width: 100px;
    height: 100px;
    background-color: #ccc0b3;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    color: #776e65;
    position: absolute;
    transition: transform 0.15s ease, opacity 0.15s ease;
    user-select: none;
}

.tile.merged {
    opacity: 0;
    transform: scale(1.2);
}

#gameover {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    font-size: 24px;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

#gameover h2 {
    margin: 0;
}

#gameover button {
    margin: 10px;
}