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

body {
    background-color: #faf8ef;
    color: #776e65;
    line-height: 1.4;
    font-size: 18px;
}

.container {
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
}

/* Header Styles */
.header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

h1 {
    font-size: 80px;
    font-weight: bold;
    margin: 0;
    line-height: 1;
    color: #776e65;
}

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

.score-box {
    background: #bbada0;
    color: white;
    padding: 8px 20px;
    border-radius: 3px;
    text-align: center;
    min-width: 62px;
    position: relative;
}

.score-title {
    font-size: 13px;
    text-transform: uppercase;
    font-weight: bold;
    line-height: 13px;
}

.score-value {
    font-size: 25px;
    font-weight: bold;
    line-height: 47px;
}

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

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

button:hover {
    background: #9f8b77;
}

/* Game Container */
.game-container {
    background: #bbada0;
    border-radius: 10px;
    padding: 15px;
    position: relative;
    margin-bottom: 20px;
    width: 500px;
    height: 500px;
}

.grid-container {
    position: relative;
    width: 470px;
    height: 470px;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 15px;
}

.grid-cell {
    background: rgba(238, 228, 218, 0.35);
    border-radius: 6px;
    aspect-ratio: 1;
}

.tile {
    position: absolute !important;
    width: 107.5px !important;
    height: 107.5px !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    font-size: 55px !important;
    font-weight: bold !important;
    border-radius: 6px !important;
    transition: all 0.15s ease-in-out !important;
    z-index: 100 !important;
    opacity: 1 !important;
    visibility: visible !important;
}

/* All tile colors are now handled dynamically by JavaScript */

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

@keyframes pop {
    0% { transform: scale(0.8); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

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

.tile-merged {
    z-index: 3;
    animation: pop 0.15s ease-in-out;
}

/* Game Over & Win Screens */
.game-over,
.game-won {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(238, 228, 218, 0.73);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    display: none;
}

.game-over h2,
.game-won h2 {
    font-size: 60px;
    margin-bottom: 20px;
    color: #776e65;
}

/* Control Buttons */
.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
    gap: 10px;
}

.control-row {
    display: flex;
    gap: 10px;
}

.control-btn {
    width: 60px;
    height: 60px;
    background: #8f7a66;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.control-btn:hover {
    background: #9f8b77;
    transform: scale(1.05);
}

.control-btn:active {
    transform: scale(0.95);
}

/* Game Explanation */
.game-explanation {
    text-align: center;
    font-size: 18px;
    line-height: 1.5;
    color: #776e65;
}

/* Responsive Design */
@media (max-width: 520px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 50px;
    }
    
    .score-box {
        min-width: 60px;
        padding: 8px 10px;
    }
    
    .tile {
        font-size: 28px;
    }
    
    .tile-128, .tile-256, .tile-512 {
        font-size: 24px;
    }
    
    .tile-1024, .tile-2048 {
        font-size: 20px;
    }
}