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

body {
    font-family: 'Arial', sans-serif;
    background: #faf8ef;
    color: #776e65;
    padding: 20px;
}

.container {
    max-width: 500px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 70px;
    font-weight: bold;
    color: #776e65;
}

.scores {
    display: flex;
    gap: 10px;
}

.score-box {
    background: #bbada0;
    padding: 10px 15px;
    border-radius: 5px;
    text-align: center;
    min-width: 80px;
}

.score-label {
    color: #eee4da;
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
}

#score, #best {
    color: white;
    font-size: 20px;
    font-weight: bold;
}

.game-intro {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.game-intro p {
    font-size: 16px;
}

#new-game {
    background: #8f7a66;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    font-size: 16px;
}

#new-game:hover {
    background: #9f8b77;
}

.game-container {
    background: #bbada0;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
    position: relative;
}

#game-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 15px;
    width: 100%;
    aspect-ratio: 1;
}

.grid-cell {
    background: #cdc1b4;
    border-radius: 5px;
}

.tile {
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 35px;
    border-radius: 5px;
    transition: all 0.1s ease-in-out;
}

.tile-2 {
    background: #eee4da;
    color: #776e65;
}

.tile-4 {
    background: #ede0c8;
    color: #776e65;
}

.tile-8 {
    background: #f2b179;
    color: white;
}

.tile-16 {
    background: #f59563;
    color: white;
}

.tile-32 {
    background: #f67c5f;
    color: white;
}

.tile-64 {
    background: #f65e3b;
    color: white;
}

.tile-128 {
    background: #edcf72;
    color: white;
    font-size: 30px;
}

.tile-256 {
    background: #edcc61;
    color: white;
    font-size: 30px;
}

.tile-512 {
    background: #edc850;
    color: white;
    font-size: 30px;
}

.tile-1024 {
    background: #edc53f;
    color: white;
    font-size: 25px;
}

.tile-2048 {
    background: #edc22e;
    color: white;
    font-size: 25px;
}

.game-message {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(238, 228, 218, 0.73);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    z-index: 100;
}

.game-message p {
    font-size: 60px;
    font-weight: bold;
    color: #776e65;
    margin-bottom: 20px;
}

#try-again {
    background: #8f7a66;
    color: white;
    border: none;
    padding: 15px 25px;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    font-size: 18px;
}

#try-again:hover {
    background: #9f8b77;
}

.instructions {
    text-align: center;
    font-size: 14px;
    color: #776e65;
}

.instructions strong {
    color: #776e65;
}

@media (max-width: 520px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 50px;
    }
    
    .score-box {
        min-width: 70px;
        padding: 8px 12px;
    }
    
    #score, #best {
        font-size: 18px;
    }
    
    .tile {
        font-size: 25px;
    }
    
    .tile-128, .tile-256, .tile-512 {
        font-size: 22px;
    }
    
    .tile-1024, .tile-2048 {
        font-size: 18px;
    }
}