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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f5f5;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    touch-action: manipulation;
}

.game-container {
    background: #fff;
    min-height: 100vh;
    padding: 10px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.score-display {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 800px;
    margin-bottom: 15px;
    font-size: 18px;
    font-weight: bold;
    color: #333;
}

#current-score {
    color: #000;
}

#high-score {
    color: #333;
}

#gameCanvas {
    border: 3px solid #333;
    border-radius: 10px;
    background: #f7f7f7;
    display: block;
    width: 100%;
    max-width: 800px;
    height: auto;
}

.overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    z-index: 10;
}

.overlay.hidden {
    display: none;
}

.overlay h1 {
    color: #333;
    margin-bottom: 15px;
    font-size: 28px;
}

.overlay h2 {
    color: #333;
    margin-bottom: 15px;
    font-size: 24px;
}

.overlay p {
    color: #666;
    margin-bottom: 20px;
    font-size: 16px;
}

button {
    background: #333;
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 25px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin: 5px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    background: #000;
}

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

#name-input-container {
    margin: 20px 0;
}

#player-name {
    padding: 12px 20px;
    font-size: 16px;
    border: 2px solid #ddd;
    border-radius: 25px;
    width: 200px;
    text-align: center;
    outline: none;
    transition: border-color 0.2s;
}

#player-name:focus {
    border-color: #333;
}

#submit-score-btn {
    background: #333;
}

#submit-score-btn:hover {
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    background: #000;
}

#leaderboard-container {
    margin-top: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    width: 100%;
    max-width: 800px;
}

#leaderboard-container h3 {
    color: #333;
    margin-bottom: 15px;
    text-align: center;
}

#leaderboard-list {
    max-height: 300px;
    overflow-y: auto;
}

.leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    margin: 5px 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.leaderboard-item.highlight {
    background: #333;
    color: white;
}

.leaderboard-item .rank {
    font-weight: bold;
    width: 30px;
}

.leaderboard-item .name {
    flex: 1;
    margin: 0 15px;
}

.leaderboard-item .score {
    font-weight: bold;
    color: #2c3e50;
}

.leaderboard-item.highlight .score {
    color: white;
}

.leaderboard-item:first-child .rank {
    color: #000;
}

.leaderboard-item:nth-child(2) .rank {
    color: #000;
}

.leaderboard-item:nth-child(3) .rank {
    color: #000;
}

.leaderboard-item.highlight:first-child .rank,
.leaderboard-item.highlight:nth-child(2) .rank,
.leaderboard-item.highlight:nth-child(3) .rank {
    color: white;
}

.loading {
    text-align: center;
    color: #999;
    padding: 20px;
}

.error {
    text-align: center;
    color: #333;
    padding: 20px;
}

/* 반응형 디자인 */
@media (max-width: 850px) {
    .game-container {
        padding: 10px;
    }

    .score-display {
        font-size: 16px;
        margin-bottom: 10px;
    }

    #gameCanvas {
        width: 100%;
        max-width: 100%;
        border: none;
        border-radius: 0;
    }

    .overlay {
        width: 90%;
        max-width: 400px;
        padding: 20px;
    }

    .overlay h1 {
        font-size: 20px;
    }

    .overlay h2 {
        font-size: 18px;
    }

    .overlay p {
        font-size: 14px;
    }

    button {
        padding: 10px 25px;
        font-size: 14px;
    }

    #player-name {
        width: 100%;
        max-width: 100%;
        font-size: 14px;
        padding: 10px 15px;
    }

    #leaderboard-container {
        padding: 15px;
        margin-top: 15px;
    }

    #leaderboard-container h3 {
        font-size: 16px;
    }

    .leaderboard-item {
        padding: 8px 12px;
        font-size: 14px;
    }

    #leaderboard-list {
        max-height: 250px;
    }
}

@media (max-width: 480px) {
    .game-container {
        padding: 5px;
    }

    .score-display {
        font-size: 14px;
        padding: 0 10px;
    }

    .overlay {
        width: 95%;
        padding: 15px;
    }

    .overlay h1 {
        font-size: 18px;
    }

    .overlay h2 {
        font-size: 16px;
    }

    button {
        padding: 8px 20px;
        font-size: 13px;
    }

    #leaderboard-container {
        padding: 10px;
    }

    .leaderboard-item {
        padding: 6px 10px;
        font-size: 12px;
    }

    .leaderboard-item .rank {
        width: 25px;
    }

    .leaderboard-item .name {
        margin: 0 10px;
    }
}

/* 100점 달성 효과 */
@keyframes flash {
    0%, 100% { background: #f7f7f7; }
    50% { background: #ffd700; }
}

.flash-effect {
    animation: flash 0.3s ease-in-out 3;
}