* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
}

body {
    background: #faf8ef;
    color: #776e65;
    padding: 80px 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
}

.container {
    width: 500px;
    margin: 0 auto;
    animation: fadeIn 1s ease-out;
    background: rgba(250, 248, 239, 0.5);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.score-panel {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(187, 173, 160, 0.3);
}

.score-box, .best-box {
    position: relative;
    background: #bbada0;
    padding: 15px 25px;
    border-radius: 3px;
    text-align: center;
    font-weight: bold;
    transition: all 0.3s ease;
    cursor: pointer;
    
    &:hover {
        background: rgba(187, 173, 160, 0.8);
        transform: translateY(-2px);
    }
}

.score-box span, .best-box span {
    color: #eee4da;
    display: block;
    font-size: 13px;
}

.score-box div, .best-box div {
    color: white;
    font-size: 25px;
}

.restart-btn {
    background: #8f7a66;
    border-radius: 3px;
    padding: 0 20px;
    text-decoration: none;
    color: #f9f6f2;
    height: 40px;
    line-height: 42px;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    
    &:hover {
        background: #7f6a56;
        transform: translateY(-2px);
        box-shadow: 0 2px 4px rgba(0,0,0,0.2);
    }
}

.game-container {
    position: relative;
    background: #bbada0;
    padding: 15px;
    border-radius: 6px;
    width: 500px;
    height: 500px;
    margin: 0 auto;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    
    &:hover {
        transform: scale(1.02);
    }
}

.grid-container {
    position: absolute;
    z-index: 1;
}

.grid-row {
    display: flex;
    margin-bottom: 15px;
}

.grid-cell {
    width: 106.25px;
    height: 106.25px;
    margin-right: 15px;
    background: rgba(238, 228, 218, 0.35);
    border-radius: 3px;
    transition: all 0.3s ease;
    
    &:hover {
        background: rgba(238, 228, 218, 0.5);
    }
}

.grid-cell:last-child {
    margin-right: 0;
}

.tile {
    position: absolute;
    width: 106.25px;
    height: 106.25px;
    border-radius: 3px;
    font-size: 55px;
    font-weight: bold;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    will-change: transform;
    backface-visibility: hidden;
    perspective: 1000px;
    
    &:hover {
        transform: scale(1.02);
    }
}

/* Confetti animation */
.confetti {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 1000;
}

.confetti::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #a8e6cf, #ffd3b6);
    background-size: 400% 400%;
    animation: confetti 3s ease infinite;
}

@keyframes confetti {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* Game over overlay */
.game-over-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        opacity: 0.5;
    }
    50% {
        opacity: 0.8;
    }
    100% {
        opacity: 0.5;
    }
}

/* Tile colors */
.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;
}

.tile-256 {
    background: #edcc61;
    color: white;
}

.tile-512 {
    background: #edc850;
    color: white;
}

.tile-1024 {
    background: #edc53f;
    color: white;
}

.tile-2048 {
    background: #edc22e;
    color: white;
}

.game-message {
    display: none;
    position: absolute;
    background: rgba(238, 228, 218, 0.7);
    padding: 0 20px;
    border-radius: 6px;
    width: 500px;
    z-index: 100;
    text-align: center;
}

.game-message p {
    font-size: 60px;
    font-weight: bold;
    height: 60px;
    line-height: 60px;
    margin-top: 222px;
    opacity: 0;
    transform: scale(1);
    transition: all 0.5s ease;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.game-message .keep-playing-button {
    display: none;
}