/* 2048 Game Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #ffeaa7 0%, #fab1a0 50%, #fd79a8 100%);
    min-height: 100vh;
    color: #2c3e50;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    background: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 1.2rem;
    color: #7f8c8d;
    margin-bottom: 15px;
}

.back-btn {
    display: inline-block;
    padding: 10px 20px;
    background: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.back-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.game-container {
    display: grid;
    grid-template-columns: 300px 1fr 250px;
    gap: 20px;
    align-items: start;
}

.game-info, .game-settings {
    background: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.game-info h3, .game-settings h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.3rem;
    border-bottom: 2px solid #fab1a0;
    padding-bottom: 5px;
}

.score-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.score-item {
    display: flex;
    justify-content: space-between;
    padding: 8px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 5px;
}

.label {
    font-weight: 600;
    color: #7f8c8d;
}

.value {
    font-weight: 700;
    color: #2c3e50;
}

.game-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.game-btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #2ecc71;
    color: white;
}

.game-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.game-btn.secondary {
    background: #95a5a6;
}

.game-btn.secondary:hover {
    background: #7f8c8d;
}

.game-btn.warning {
    background: #e74c3c;
}

.game-btn.warning:hover {
    background: #c0392b;
}

.progress-section {
    margin-bottom: 20px;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 6px;
    overflow: hidden;
    margin: 10px 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #ffeaa7, #fab1a0, #fd79a8);
    width: 0%;
    transition: width 0.5s ease;
}

.progress-text {
    text-align: center;
    font-weight: 600;
    color: #2c3e50;
    font-size: 0.9rem;
}

.controls-info {
    margin-bottom: 20px;
}

.control-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 10px;
}

.control-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 0;
}

.key {
    background: #ecf0f1;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: monospace;
    font-weight: bold;
    font-size: 0.8rem;
}

.action {
    font-size: 0.9rem;
    color: #7f8c8d;
}

.tip {
    font-size: 0.85rem;
    color: #e67e22;
    font-style: italic;
    margin-top: 10px;
    padding: 8px;
    background: rgba(230, 126, 34, 0.1);
    border-radius: 5px;
}

.game-board {
    display: flex;
    justify-content: center;
    align-items: center;
}

.board-container {
    position: relative;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.grid-container {
    position: relative;
    width: 340px;
    height: 340px;
    background: #bbada0;
    border-radius: 10px;
    padding: 10px;
    display: grid;
    grid-template-rows: repeat(4, 1fr);
    gap: 10px;
}

.grid-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.grid-cell {
    background: rgba(238, 228, 218, 0.35);
    border-radius: 6px;
    width: 70px;
    height: 70px;
}

.tile-container {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 340px;
    height: 340px;
    padding: 10px;
}

.tile {
    position: absolute;
    width: 70px;
    height: 70px;
    background: #eee4da;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: bold;
    transition: all 0.15s ease-in-out;
    color: #776e65;
}

/* Tile Colors */
.tile-2 { background: #eee4da; color: #776e65; }
.tile-4 { background: #ede0c8; color: #776e65; }
.tile-8 { background: #f2b179; color: #f9f6f2; }
.tile-16 { background: #f59563; color: #f9f6f2; }
.tile-32 { background: #f67c5f; color: #f9f6f2; }
.tile-64 { background: #f65e3b; color: #f9f6f2; }
.tile-128 { background: #edcf72; color: #f9f6f2; font-size: 28px; }
.tile-256 { background: #edcc61; color: #f9f6f2; font-size: 28px; }
.tile-512 { background: #edc850; color: #f9f6f2; font-size: 28px; }
.tile-1024 { background: #edc53f; color: #f9f6f2; font-size: 24px; }
.tile-2048 { background: #edc22e; color: #f9f6f2; font-size: 24px; box-shadow: 0 0 20px rgba(237, 194, 46, 0.5); }

/* Super tiles */
.tile-4096 { background: #3c3a32; color: #f9f6f2; font-size: 20px; }
.tile-8192 { background: #3c3a32; color: #f9f6f2; font-size: 18px; }

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

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

.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 15px;
}

.overlay-content {
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    max-width: 400px;
}

.overlay-content h2 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.8rem;
}

.overlay-content p {
    color: #7f8c8d;
    margin-bottom: 20px;
    line-height: 1.6;
}

.setting {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.setting:last-child {
    border-bottom: none;
}

.setting label {
    font-weight: 600;
    color: #2c3e50;
}

.setting select {
    padding: 5px 10px;
    border: 2px solid #bdc3c7;
    border-radius: 5px;
    background: white;
    color: #2c3e50;
    font-size: 0.9rem;
}

.toggle-btn {
    padding: 6px 12px;
    border: 2px solid #bdc3c7;
    border-radius: 5px;
    background: white;
    color: #7f8c8d;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.toggle-btn.active {
    background: #2ecc71;
    color: white;
    border-color: #27ae60;
}

.toggle-btn:hover {
    transform: translateY(-1px);
}

footer {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    color: #7f8c8d;
}

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

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

.score-animation {
    position: absolute;
    color: #f67c5f;
    font-weight: bold;
    font-size: 24px;
    opacity: 1;
    animation: scoreFloat 1s ease-out;
    pointer-events: none;
}

@keyframes scoreFloat {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-100px);
    }
}

/* Theme Variations */
.theme-neon .tile {
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.theme-neon .tile-2 { background: #1a1a2e; color: #16c2c2; }
.theme-neon .tile-4 { background: #16213e; color: #0f3460; }
.theme-neon .tile-8 { background: #0f3460; color: #e94560; }

.theme-pastel .tile-2 { background: #ffeaa7; color: #2d3436; }
.theme-pastel .tile-4 { background: #fab1a0; color: #2d3436; }
.theme-pastel .tile-8 { background: #fd79a8; color: #ffffff; }

.theme-dark {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
}

.theme-dark .tile { color: #ecf0f1; }
.theme-dark .tile-2 { background: #34495e; }
.theme-dark .tile-4 { background: #2c3e50; }

/* Responsive Design */
@media (max-width: 1200px) {
    .game-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .game-info, .game-settings {
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .grid-container {
        width: 280px;
        height: 280px;
    }
    
    .grid-cell, .tile {
        width: 57px;
        height: 57px;
    }
    
    .tile {
        font-size: 24px;
    }
    
    .tile-128, .tile-256, .tile-512 {
        font-size: 20px;
    }
    
    .tile-1024, .tile-2048 {
        font-size: 18px;
    }
    
    .game-controls {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .game-btn {
        flex: 1;
        min-width: 100px;
    }
}