/* 2048 Game - Orange/Yellow Theme */

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

:root {
    --primary-color: #F59E0B;
    --primary-dark: #D97706;
    --primary-light: #FCD34D;
    --background: #FFFBEB;
    --surface: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #FDE68A;
    --grid-bg: #D97706;
    --empty-tile: #FDE68A;
    --shadow: 0 2px 4px rgba(245, 158, 11, 0.1);
    --shadow-lg: 0 10px 25px rgba(245, 158, 11, 0.2);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* Ad Placeholders */
.ad-placeholder {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    border: 2px dashed var(--primary-color);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    margin: 20px auto;
    max-width: 728px;
    color: var(--primary-dark);
    font-size: 0.9rem;
}

/* Header */
header {
    margin-bottom: 30px;
}

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

.back-btn {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.back-btn:hover {
    color: var(--primary-dark);
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin: 0;
}

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

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

.score-box {
    background: var(--surface);
    padding: 15px 25px;
    border-radius: 8px;
    box-shadow: var(--shadow);
    text-align: center;
    border: 2px solid var(--border-color);
}

.score-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 5px;
}

.score-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.new-game-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, #FB923C 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
}

.new-game-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    transform: scale(1.05);
}

/* Instructions */
.instructions {
    background: var(--surface);
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow);
}

.instructions p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Game Board */
.game-board {
    background: var(--grid-bg);
    border-radius: 12px;
    padding: 15px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    width: 100%;
    aspect-ratio: 1;
    position: relative;
    box-shadow: var(--shadow-lg);
}

/* Tiles */
.tile {
    background: var(--empty-tile);
    border-radius: 8px;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    transition: all 0.15s ease;
}

.tile[data-value="0"] {
    background: var(--empty-tile);
    opacity: 0.5;
}

/* Tile Colors - Orange/Yellow Theme */
.tile[data-value="2"] { background: #FEF3C7; color: #92400E; }
.tile[data-value="4"] { background: #FDE68A; color: #92400E; }
.tile[data-value="8"] { background: #FCD34D; color: #78350F; }
.tile[data-value="16"] { background: #FBBF24; color: #78350F; }
.tile[data-value="32"] { background: #F59E0B; color: #FFFFFF; }
.tile[data-value="64"] { background: #D97706; color: #FFFFFF; }
.tile[data-value="128"] { background: #B45309; color: #FFFFFF; font-size: 1.8rem; }
.tile[data-value="256"] { background: #92400E; color: #FFFFFF; font-size: 1.8rem; }
.tile[data-value="512"] { background: #FB923C; color: #FFFFFF; font-size: 1.8rem; }
.tile[data-value="1024"] { background: #F97316; color: #FFFFFF; font-size: 1.5rem; }
.tile[data-value="2048"] { background: #EA580C; color: #FFFFFF; font-size: 1.5rem; }
.tile[data-value="4096"] { background: #C2410C; color: #FFFFFF; font-size: 1.5rem; }

/* Game Over Overlay */
.game-over, .win-message {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.game-over.hidden, .win-message.hidden {
    display: none;
}

.game-over-content, .win-content {
    background: var(--surface);
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    border: 3px solid var(--primary-color);
}

.game-over-content h2, .win-content h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--primary-dark);
}

.game-over-content p, .win-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

#final-score {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.restart-btn, .continue-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, #FB923C 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    margin: 5px;
    box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
}

.restart-btn:hover, .continue-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    transform: scale(1.05);
}

/* Tips Section */
.tips {
    background: var(--surface);
    padding: 20px;
    border-radius: 8px;
    margin-top: 30px;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow);
}

.tips h3 {
    margin-bottom: 15px;
    color: var(--primary-dark);
}

.tips ul {
    list-style: none;
    padding-left: 0;
}

.tips li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 25px;
}

.tips li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* Responsive */
@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }
    
    .game-info {
        flex-direction: column;
    }
    
    .new-game-btn {
        width: 100%;
    }
    
    .tile {
        font-size: 1.5rem;
    }
    
    .tile[data-value="128"],
    .tile[data-value="256"],
    .tile[data-value="512"] {
        font-size: 1.3rem;
    }
    
    .tile[data-value="1024"],
    .tile[data-value="2048"],
    .tile[data-value="4096"] {
        font-size: 1rem;
    }
}