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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.container {
    text-align: center;
    max-width: 1200px;
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
}

@media (max-width: 768px) {
    .container {
        padding: 5px;
    }
}

h1 {
    font-size: 2.5em;
    margin-bottom: 30px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.8em;
        margin-bottom: 15px;
    }
}

.lobby {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 30px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .lobby {
        padding: 15px;
        border-radius: 10px;
    }
}

.player-section {
    margin: 20px 0;
}

.join-btn, .ready-btn, .restart-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 300px;
}

@media (max-width: 768px) {
    .join-btn, .ready-btn, .restart-btn {
        padding: 12px 20px;
        font-size: 1em;
        max-width: 100%;
    }
}

.join-btn:hover, .ready-btn:hover, .restart-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.join-btn:active, .ready-btn:active, .restart-btn:active {
    transform: translateY(0);
}

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

.player-status {
    margin-top: 10px;
    font-size: 1.1em;
    color: #ffd700;
}

.ready-section {
    margin-top: 30px;
}

.countdown {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

#countdown-text {
    font-size: 10em;
    font-weight: bold;
    color: #ffd700;
    text-shadow: 0 0 30px rgba(255, 215, 0, 0.5);
    animation: pulse 1s infinite;
}

@media (max-width: 768px) {
    #countdown-text {
        font-size: 6em;
    }
}

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

.game {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 10px;
    backdrop-filter: blur(10px);
    width: 100%;
    box-sizing: border-box;
}

@media (max-width: 768px) {
    .game {
        padding: 5px;
        border-radius: 10px;
    }
}

#gameCanvas {
    border: 3px solid white;
    border-radius: 10px;
    background: #000;
    display: block;
    margin: 0 auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    touch-action: none; /* 모바일 터치 최적화 */
    user-select: none; /* 텍스트 선택 방지 */
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    max-width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    #gameCanvas {
        border-width: 2px;
        border-radius: 8px;
    }
}

#game-info {
    display: flex;
    justify-content: space-around;
    margin-top: 10px;
    font-size: 1.2em;
    font-weight: bold;
    flex-wrap: wrap;
    gap: 10px;
}

@media (max-width: 768px) {
    #game-info {
        font-size: 0.9em;
        margin-top: 8px;
        flex-direction: column;
        gap: 5px;
    }

    #game-info div {
        font-size: 0.85em;
    }
}

.game-over {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 40px;
    backdrop-filter: blur(10px);
}

#winner-text {
    font-size: 2.5em;
    margin-bottom: 30px;
    color: #ffd700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

@media (max-width: 768px) {
    .game-over {
        padding: 20px;
    }

    #winner-text {
        font-size: 1.8em;
        margin-bottom: 20px;
    }
}