:root {
    --neon-blue: #00f3ff;
    --space-black: #0a0a16;
    --neon-pink: #ff00ff;
    --cyber-gradient: linear-gradient(
        135deg, 
        var(--neon-blue) 0%, 
        var(--neon-pink) 100%
    );
    --numberpuzzle-blue: #4A90E2;
    --numberpuzzle-yellow: #FFD700;
}

body {
    margin: 0;
    overflow-x: hidden;
    background: linear-gradient(45deg, var(--space-black) 30%, #1a1a2e);
    color: white;
    font-family: 'Noto Sans KR', sans-serif;
}

#scene-container {
    position: fixed;
    width: 100vw;
    height: 100vh;
    z-index: -1;
}

.portal-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.game-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    perspective: 1000px;
}

.game-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 0.8rem;
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
    cursor: pointer;
    transform: scale(0.95);
}

.game-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--cyber-gradient);
    opacity: 0.1;
    z-index: -1;
    transition: opacity 0.3s;
}

.game-card:hover {
    transform: translateY(-8px) rotateX(8deg) rotateY(-8deg);
    box-shadow: 0 25px 50px rgba(0, 243, 255, 0.3);
}

.game-card:hover::after {
    opacity: 0.2;
}

@media (min-width: 1024px) {
    .game-grid {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
}

@media (max-width: 768px) {
    .game-grid {
        grid-template-columns: repeat(4, minmax(160px, 1fr));
        gap: 0.8rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding: 0 1rem 1rem;
    }

    .game-card {
        min-width: 160px;
        padding: 0.7rem;
        transform: scale(0.92);
        margin-right: -5px;
    }

    .game-card h3 {
        font-size: 0.9rem;
    }

    .game-card p {
        min-height: auto;
    }
}

.card-header {
    position: relative;
    margin-bottom: 1rem;
}

.game-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    margin-bottom: 0.8rem;
    transition: transform 0.3s ease;
}

.game-card:hover .game-icon {
    transform: scale(1.1) rotate(5deg);
}

.badge {
    position: absolute;
    top: -10px;
    right: -10px;
    background: #ff4757;
    color: white;
    padding: 4px 8px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
    transition: transform 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.game-card:hover .badge {
    transform: translateY(-5px) rotate(5deg);
}

.game-link {
    display: inline-block;
    margin-top: 1rem;
    padding: 8px 20px;
    background: linear-gradient(45deg, var(--neon-blue), #00ff88);
    border-radius: 25px;
    text-decoration: none;
    color: var(--space-black);
    font-weight: bold;
    transition: transform 0.3s ease;
}

.game-link:hover {
    transform: translateY(-2px);
}

.portal-title {
    font-size: 3rem;
    text-align: center;
    margin: 2rem 0;
    background: linear-gradient(45deg, var(--neon-blue), var(--neon-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(0, 243, 255, 0.3);
    font-family: 'Orbitron', sans-serif;
}

.game-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.game-card p {
    min-height: 3.5em;
    line-height: 1.5;
    display: block;
    font-size: 0.9rem;
}

.meta-info {
    margin-top: 1rem;
    display: grid;
    gap: 0.3rem;
}

.platform-tag, .lang-tag {
    margin-bottom: 0.3rem;
}

.platform-tag {
    display: inline-block;
    padding: 4px 8px;
    background: rgba(0, 243, 255, 0.1);
    border: 1px solid var(--neon-blue);
    border-radius: 4px;
    font-size: 0.8rem;
    margin-right: 4px;
}

.lang-tag {
    display: inline-block;
    padding: 4px 8px;
    background: rgba(255, 0, 255, 0.1);
    border: 1px solid var(--neon-pink);
    border-radius: 4px;
    font-size: 0.8rem;
    margin-right: 4px;
}

.game-link {
    margin-top: 1rem;
    width: 100%;
    text-align: center;
}

.footer {
    text-align: center;
    padding: 2rem;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
    margin-top: 3rem;
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--neon-blue);
    display: block;
    transition: all 0.3s ease;
    font-family: 'Orbitron', sans-serif;
}

.card-title:hover {
    color: var(--neon-pink);
    text-shadow: 0 0 15px rgba(255, 0, 255, 0.5);
}

.game-card[data-game="numberpuzzle"] {
    border-color: var(--numberpuzzle-blue);
}

.game-card[data-game="numberpuzzle"] .card-title {
    color: var(--numberpuzzle-yellow);
}

.game-card[data-game="numberpuzzle"]::after {
    background: linear-gradient(45deg, var(--numberpuzzle-blue), var(--numberpuzzle-yellow));
}

.game-card[data-game="numberpuzzle"]:hover {
    box-shadow: 0 0 30px rgba(74, 144, 226, 0.4);
}

#home-btn {
    position: fixed;
    left: 2rem;
    bottom: 2rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--neon-blue);
    color: var(--neon-blue);
    padding: 12px 24px;
    border-radius: 30px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

#home-btn:hover {
    background: var(--neon-blue);
    color: var(--space-black);
    transform: translateY(-3px);
}

#home-btn svg {
    width: 20px;
    height: 20px;
}

/* SVG 아이콘에 애니메이션 추가 */
.game-card[data-game="numberpuzzle"] .game-icon {
    filter: drop-shadow(0 0 5px var(--numberpuzzle-blue));
    animation: pulseNumber 2s infinite;
}

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

/* Base64 인코더 전용 스타일 추가 */
.game-card[data-game="base64encoder"] {
    border-color: #4CAF50;
}
.game-card[data-game="base64encoder"] .card-title {
    color: #8BC34A;
}
.game-card[data-game="base64encoder"]::after {
    background: linear-gradient(45deg, #4CAF50, #8BC34A);
}
.game-card[data-game="base64encoder"]:hover {
    box-shadow: 0 0 30px rgba(76, 175, 80, 0.4);
}
.game-card[data-game="base64encoder"] .game-icon {
    animation: pulseGreen 2s infinite;
}

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