:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --background-color: #ecf0f1;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

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

body {
    background: var(--background-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-family: 'Poppins', sans-serif;
}

main {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: var(--box-shadow);
    text-align: center;
    max-width: 500px;
    width: 90%;
}

#gname {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    letter-spacing: 2px;
}

#winmsg {
    color: var(--accent-color);
    font-size: 2rem;
    margin: 1rem 0;
    transition: all 0.3s ease;
}

.hide {
    display: none;
}

.container {
    margin: 2rem 0;
}

.game {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: 0 auto;
    max-width: 300px;
}

.box {
    aspect-ratio: 1;
    font-size: 2rem;
    border: none;
    background: var(--background-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--primary-color);
    font-weight: bold;
}

.box:hover {
    background: #d5dbdb;
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

#ngame, #rst-btn {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    margin: 0.5rem;
}

#ngame {
    background: var(--secondary-color);
    color: white;
}

#rst-btn {
    background: var(--accent-color);
    color: white;
}

#ngame:hover, #rst-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

footer {
    margin-top: 2rem;
    color: var(--primary-color);
    font-size: 0.9rem;
}

footer p {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

#heart {
    color: var(--accent-color);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

@media (max-width: 480px) {
    main {
        padding: 1rem;
    }
    
    #gname {
        font-size: 2rem;
    }
    
    .game {
        max-width: 250px;
    }
    
    .box {
        font-size: 1.5rem;
    }
}