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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #333;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    text-align: center;
}

h1 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.game-info {
    display: flex;
    justify-content: space-around;
    margin-bottom: 15px;
    font-size: 1.2em;
    font-weight: bold;
}

.score, .high-score {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    padding: 10px 20px;
    border-radius: 10px;
    color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.difficulty-selector {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.difficulty-selector label {
    font-weight: bold;
    color: #667eea;
    font-size: 1.1em;
}

.difficulty-btn {
    padding: 8px 20px;
    font-size: 14px;
    font-weight: bold;
    border: 2px solid #667eea;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: white;
    color: #667eea;
}

.difficulty-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.difficulty-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.4);
}

.difficulty-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

#gameCanvas {
    border: 3px solid #667eea;
    border-radius: 10px;
    background-color: #f0f0f0;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    display: block;
    margin: 0 auto 20px;
}

.controls {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 20px;
}

button {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: white;
}

#startBtn {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

#pauseBtn {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

#restartBtn {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.instructions {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 10px;
    margin-top: 20px;
}

.instructions h3 {
    color: #667eea;
    margin-bottom: 10px;
}

.instructions p {
    margin: 5px 0;
    color: #555;
}