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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(to right, #000033, #000066, #220022, #440022, #660033);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #ffffff;
    position: relative;
    overflow: hidden;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 100, 200, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 2, 2, 0.957) 0%, transparent 50%);
    z-index: -1;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

.container {
    text-align: center;
    max-width: 500px;
    width: 100%;
    padding: 20px;
}

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

h1 {
    font-size: 48px;
    font-weight: bold;
    color: #ffffff;
    margin: 0;
    text-shadow: 0 0 20px rgba(255, 0, 0, 0.5);
    letter-spacing: 2px;
}

.scores-container {
    display: flex;
    gap: 15px;
}

.score-container {
    background: linear-gradient(135deg, rgba(255, 0, 150, 0.2), rgba(150, 0, 255, 0.2));
    border: 1px solid rgba(255, 0, 150, 0.3);
    padding: 12px 20px;
    border-radius: 10px;
    color: white;
    font-weight: bold;
    position: relative;
    min-width: 80px;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(255, 0, 150, 0.2);
}

.score-label {
    font-size: 13px;
    text-transform: uppercase;
    margin-bottom: 5px;
}

.score {
    font-size: 25px;
    font-weight: bold;
}

.instructions {
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 1.4;
}

.game-container {
    position: relative;
    background: linear-gradient(135deg, rgba(15, 12, 41, 0.9), rgba(48, 43, 99, 0.9));
    border: 2px solid rgba(255, 0, 150, 0.3);
    border-radius: 15px;
    padding: 15px;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    aspect-ratio: 1;
    backdrop-filter: blur(20px);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        0 0 60px rgba(255, 0, 150, 0.1),
        inset 0 0 20px rgba(255, 0, 150, 0.05);
}

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

.grid-row {
    display: flex;
    margin-bottom: 10px;
}

.grid-row:last-child {
    margin-bottom: 0;
}

.grid-cell {
    width: 106.25px;
    height: 106.25px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 0, 150, 0.2);
    border-radius: 10px;
    margin-right: 10px;
    backdrop-filter: blur(5px);
}

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

.tile-container {
    position: absolute;
    z-index: 2;
}

.tile {
    position: absolute;
    left: 0;
    top: 0;
    width: 106.25px;
    height: 106.25px;
    background: linear-gradient(135deg, rgba(255, 0, 150, 0.8), rgba(150, 0, 255, 0.8));
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    font-weight: bold;
    font-size: 35px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.16s ease-in-out, opacity 0.16s ease-in-out;
    color: #ffffff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    box-shadow: 
        0 4px 15px rgba(255, 0, 150, 0.3),
        inset 0 0 20px rgba(255, 255, 255, 0.1);
}

.tile-new {
    animation: appear 0.2s ease-in-out;
}

@keyframes appear {
    0% {
        opacity: 0;
        transform: scale(0);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.tile-2 { 
    background: linear-gradient(135deg, rgba(255, 0, 150, 0.6), rgba(150, 0, 255, 0.6)); 
    color: #ffffff; 
    border-color: rgba(255, 0, 150, 0.4);
}
.tile-4 { 
    background: linear-gradient(135deg, rgba(255, 0, 150, 0.7), rgba(150, 0, 255, 0.7)); 
    color: #ffffff; 
    border-color: rgba(255, 0, 150, 0.5);
}
.tile-8 { 
    background: linear-gradient(135deg, rgba(255, 100, 0, 0.8), rgba(255, 0, 150, 0.8)); 
    color: #ffffff; 
    border-color: rgba(255, 100, 0, 0.5);
    box-shadow: 0 4px 20px rgba(255, 100, 0, 0.4);
}
.tile-16 { 
    background: linear-gradient(135deg, rgba(255, 150, 0, 0.8), rgba(255, 50, 0, 0.8)); 
    color: #ffffff; 
    border-color: rgba(255, 150, 0, 0.5);
    box-shadow: 0 4px 20px rgba(255, 150, 0, 0.4);
}
.tile-32 { 
    background: linear-gradient(135deg, rgba(255, 0, 100, 0.8), rgba(255, 0, 50, 0.8)); 
    color: #ffffff; 
    border-color: rgba(255, 0, 100, 0.5);
    box-shadow: 0 4px 20px rgba(255, 0, 100, 0.4);
}
.tile-64 { 
    background: linear-gradient(135deg, rgba(255, 0, 50, 0.9), rgba(200, 0, 0, 0.9)); 
    color: #ffffff; 
    border-color: rgba(255, 0, 50, 0.6);
    box-shadow: 0 4px 25px rgba(255, 0, 50, 0.5);
}
.tile-128 { 
    background: linear-gradient(135deg, rgba(255, 200, 0, 0.9), rgba(255, 150, 0, 0.9)); 
    color: #ffffff; 
    font-size: 30px; 
    border-color: rgba(255, 200, 0, 0.6);
    box-shadow: 0 4px 25px rgba(255, 200, 0, 0.5);
}
.tile-256 { 
    background: linear-gradient(135deg, rgba(255, 220, 0, 0.9), rgba(255, 180, 0, 0.9)); 
    color: #ffffff; 
    font-size: 30px; 
    border-color: rgba(255, 220, 0, 0.6);
    box-shadow: 0 4px 25px rgba(255, 220, 0, 0.5);
}
.tile-512 { 
    background: linear-gradient(135deg, rgba(0, 255, 200, 0.9), rgba(0, 200, 255, 0.9)); 
    color: #ffffff; 
    font-size: 30px; 
    border-color: rgba(0, 255, 200, 0.6);
    box-shadow: 0 4px 25px rgba(0, 255, 200, 0.5);
}
.tile-1024 { 
    background: linear-gradient(135deg, rgba(0, 150, 255, 0.9), rgba(150, 0, 255, 0.9)); 
    color: #ffffff; 
    font-size: 25px; 
    border-color: rgba(0, 150, 255, 0.6);
    box-shadow: 0 4px 30px rgba(0, 150, 255, 0.6);
}
.tile-2048 { 
    background: linear-gradient(135deg, rgba(255, 0, 255, 0.9), rgba(0, 255, 255, 0.9)); 
    color: #ffffff; 
    font-size: 25px; 
    border-color: rgba(255, 0, 255, 0.6);
    box-shadow: 0 4px 30px rgba(255, 0, 255, 0.6);
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    0% {
        box-shadow: 0 4px 30px rgba(255, 0, 255, 0.6);
    }
    100% {
        box-shadow: 0 4px 40px rgba(255, 0, 255, 0.9), 0 0 60px rgba(0, 255, 255, 0.6);
    }
}

.tile-super {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(200, 200, 255, 0.9));
    color: #0f0c29;
    font-size: 20px;
    border-color: rgba(255, 255, 255, 0.8);
    box-shadow: 0 4px 30px rgba(255, 255, 255, 0.5);
}

.tile-merged {
    animation: merge 0.2s ease-in-out;
}

.tile-removing {
    opacity: 0;
}

@keyframes merge {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}

.game-message {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(15, 12, 41, 0.95), rgba(48, 43, 99, 0.95));
    z-index: 100;
    display: none;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(20px);
}

.game-message.show {
    display: flex;
}

.message-content {
    background: linear-gradient(135deg, rgba(255, 0, 150, 0.1), rgba(150, 0, 255, 0.1));
    border: 2px solid rgba(255, 0, 150, 0.3);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.5),
        0 0 60px rgba(255, 0, 150, 0.2),
        inset 0 0 20px rgba(255, 0, 150, 0.05);
    backdrop-filter: blur(20px);
}

.message-content h2 {
    font-size: 36px;
    color: #ffffff;
    margin-bottom: 20px;
    text-shadow: 0 0 20px rgba(255, 0, 150, 0.5);
}

.message-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
}

.restart-button, .new-game-button {
    background: linear-gradient(135deg, rgba(255, 0, 150, 0.8), rgba(150, 0, 255, 0.8));
    color: #ffffff;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 25px;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    backdrop-filter: blur(10px);
    box-shadow: 
        0 4px 15px rgba(255, 0, 150, 0.3),
        inset 0 0 20px rgba(255, 255, 255, 0.1);
}

.restart-button:hover, .new-game-button:hover {
    background: linear-gradient(135deg, rgba(255, 0, 150, 0.9), rgba(150, 0, 255, 0.9));
    transform: translateY(-2px);
    box-shadow: 
        0 6px 20px rgba(255, 0, 150, 0.4),
        inset 0 0 25px rgba(255, 255, 255, 0.15);
}

.new-game-button {
    margin-top: 20px;
    font-size: 18px;
    padding: 12px 24px;
}

@media (max-width: 520px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 36px;
    }
    
    .grid-cell, .tile {
        width: 70px;
        height: 70px;
        font-size: 25px;
    }
    
    .tile-128, .tile-256, .tile-512 {
        font-size: 20px;
    }
    
    .tile-1024, .tile-2048 {
        font-size: 18px;
    }
    
    .tile-super {
        font-size: 14px;
    }
    
    .score-container {
        padding: 8px 15px;
        min-width: 50px;
    }
    
    .score {
        font-size: 20px;
    }
    
    .instructions {
        font-size: 12px;
    }
}