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

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

.game-container {
    text-align: center;
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

h1 {
    margin-bottom: 10px;
    color: #667eea;
    font-size: 2em;
}

.difficulty-info {
    margin-bottom: 15px;
    font-size: 1.2em;
    font-weight: bold;
    color: #667eea;
}

#difficultyLevel {
    color: #f44336;
    font-size: 1.3em;
}

.high-score {
    margin-left: 15px;
    color: #667eea;
}

#highScore {
    color: #FFD700;
    font-size: 1.3em;
    font-weight: bold;
}

.game-area {
    position: relative;
    width: 600px;
    height: 400px;
    background: #f0f0f0;
    border: 3px solid #333;
    border-radius: 10px;
    margin: 20px auto;
    overflow: hidden;
}

/* 安全地帯 */
.safe-zone {
    position: absolute;
    background: rgba(76, 175, 80, 0.15);
    border: 2px dashed rgba(76, 175, 80, 0.5);
    border-radius: 5px;
    z-index: 1;
    pointer-events: none; /* クリックイベントを無効化 */
}

/* プレイヤー */
.player {
    position: absolute;
    width: 30px;
    height: 30px;
    background: #4CAF50;
    border: 2px solid #2e7d32;
    border-radius: 5px;
    transition: transform 0.1s ease;
    z-index: 3;
}

/* 敵 */
.enemy {
    position: absolute;
    width: 40px;
    height: 40px;
    background: #f44336;
    border: 2px solid #c62828;
    border-radius: 5px;
    z-index: 2;
}

/* 動く敵（視覚的に区別できるように） */
.enemy-moving {
    background: #e91e63;
    border: 2px solid #ad1457;
    box-shadow: 0 0 10px rgba(233, 30, 99, 0.5);
    animation: enemyPulse 1s ease-in-out infinite;
}

@keyframes enemyPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* ゴール */
.goal {
    position: absolute;
    width: 35px;
    height: 35px;
    background: #FFD700;
    border: 3px solid #FFA500;
    border-radius: 50%;
    z-index: 2;
    animation: pulse 1.5s ease-in-out infinite;
}

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

.status {
    margin-top: 20px;
    font-size: 1.2em;
    font-weight: bold;
    color: #333;
    min-height: 30px;
}

.status.game-over {
    color: #f44336;
    font-size: 1.5em;
}

.status.clear {
    color: #4CAF50;
    font-size: 1.5em;
}

.reset-button {
    margin-top: 20px;
    padding: 12px 30px;
    font-size: 1.1em;
    font-weight: bold;
    color: white;
    background: #667eea;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.reset-button:hover {
    background: #5568d3;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.reset-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}