:root {
    --primary-color: #3B82F6;
    --secondary-color: #10B981;
    --background-color: #111827;
    --text-color: #F9FAFB;
    --card-bg-color: #1F2937;
    --border-color: #374151;
}

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    text-align: center;
}

header {
    margin-bottom: 40px;
}

h1 {
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary-color);
    text-shadow: 0 0 10px var(--primary-color);
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.button-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.category-btn, .round-btn, #restart-btn, #back-btn {
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--primary-color);
    color: var(--text-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.category-btn:hover, .round-btn:hover, #restart-btn:hover, #back-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

#back-btn {
    margin-top: 30px;
    background-color: #EF4444; /* Red color for exit/back */
}

#back-btn:hover {
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

#game-board {
    margin-top: 40px;
}

#game-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 20px;
}

.game-card {
    background-color: var(--card-bg-color);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 350px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.game-card:hover {
    transform: scale(1.05);
    border-color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.img-container {
    width: 100%;
    height: 200px;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    background-color: #000;
}

.img-container img, .img-container iframe {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border: none;
}

.game-card p {
    font-size: 1.3rem;
    font-weight: 600;
    margin-top: 15px;
    margin-bottom: 15px;
}

.listen-btn {
    background-color: #FF0000;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    transition: background-color 0.2s;
    width: 90%;
}

.listen-btn:hover {
    background-color: #CC0000;
}

#winner-display {
    margin-top: 40px;
}

#winner-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.winner-card {
    width: 450px;
}

.winner-card .img-container {
    height: 280px;
}

#ranking {
    margin-top: 60px;
}

#ranking-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    text-align: left;
}

.ranking-item {
    background-color: var(--card-bg-color);
    padding: 15px;
    border-radius: 8px;
    border-left: 5px solid var(--secondary-color);
}

.hidden {
    display: none;
}