body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: url(images/bg_space_seamless.png) no-repeat center center fixed;
    background-size: cover;
    color: #fff;
    font-family: Arial, sans-serif;
    overflow: hidden;
}

/*
.solar-system {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
*/

.solar-system {
    position: relative;
    width: 80vw;
    height: 80vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.sun {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background-color: #ffcc00;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    line-height: 200px;
    font-size: 24px;
    color: #000;
    z-index: 0 !important;
}

.planet {
    position: absolute;
    border-radius: 50%;
    text-align: center;
    line-height: 1;
    text-decoration: none;
    color: #fff;
    background-color: #444;
    transition: transform 0.3s;
    animation: orbit 20s linear infinite;
}

.planet-name {
    display: none;
    position: absolute;
    bottom: -30px;
    left: -10%;
    background-color: rgba(0, 0, 0, 0.7);
    padding: 5px;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    color: #00ff00;
    z-index: 20; /* ensure planet name appears in front */
}

.planet:hover  .planet-name {
    transform: scale(1.2);
    display: block;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5)
}

@keyframes orbit {
    from {
        transform: rotate(0deg) translateX(var(--distance)) rotate(0deg);
    }
    to {
        transform: rotate(360deg) translateX(var(--distance)) rotate(-360deg);
    }
}

.mercury {
    --distance: 75px;
    width: 20px;
    height: 20px;
    background-color: #aaa;
    animation-duration: 10s;
    animation-delay: -2s; /* start at a different point in orbit */
    z-index: 0 !important; /* ensure text appears over planets */
}

.venus {
    --distance: 125px;
    width: 40px;
    height: 40px;
    background-color: #f5a623;
    animation-duration: 15s;
    animation-delay: -2s; 
    z-index: 0 !important;
}

.earth {
    --distance: 175px;
    width: 45px;
    height: 45px;
    background-color: #2a9df4;
    animation-duration: 20s;
    animation-delay: -6s;
    z-index: 0 !important;
}

.mars {
    --distance: 225px;
    width: 30px;
    height: 30px;
    background-color: #d14b4b;
    animation-duration: 25s;
    animation-delay: -4s;
    z-index: 0 !important;
}

.jupiter {
    --distance: 300px;
    width: 80px;
    height: 80px;
    background-color: #f7c873;
    animation-duration: 30s;
    animation-delay: -5s; 
    z-index: 0 !important;
}

.saturn {
    --distance: 400px;
    width: 70px;
    height: 70px;
    background-color: #e3c16f;
    animation-duration: 35s;
    animation-delay: -8s; 
    z-index: 0 !important;
}

.uranus {
    --distance: 500px;
    width: 60px;
    height: 60px;
    background-color: #76d7c4;
    animation-duration: 40s;
    animation-delay: -2s; 
    z-index: 0 !important;
}

.neptune {
    --distance: 600px;
    width: 55px;
    height: 55px;
    background-color: #4a90e2;
    animation-duration: 45s;
    animation-delay: 0s; 
    z-index: 0 !important;
}