@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Exo+2:wght@400;700&display=swap');

body {
    font-family: 'Exo 2', sans-serif;
    background-color: #000;
    color: #fff;
    background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);
    overflow-x: hidden
}

.font-space {
    font-family: 'Orbitron', sans-serif
}

.stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: radial-gradient(2px 2px at 20px 30px, #eee, rgba(0, 0, 0, 0)), radial-gradient(2px 2px at 40px 70px, #fff, rgba(0, 0, 0, 0)), radial-gradient(2px 2px at 50px 160px, #ddd, rgba(0, 0, 0, 0)), radial-gradient(2px 2px at 90px 40px, #fff, rgba(0, 0, 0, 0)), radial-gradient(2px 2px at 130px 80px, #fff, rgba(0, 0, 0, 0));
    background-repeat: repeat;
    background-size: 200px 200px;
    animation: twinkle 5s infinite linear
}

@keyframes twinkle {
    0% {
        transform: translateY(0)
    }

    100% {
        transform: translateY(-200px)
    }
}

.holo-panel {
    background: rgba(0, 255, 255, 0.05);
    border: 1px solid rgba(0, 255, 255, 0.3);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.1), inset 0 0 20px rgba(0, 255, 255, 0.05);
    border-radius: 10px;
    backdrop-filter: blur(5px);
    position: relative
}

.holo-panel::before,
.holo-panel::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    border-color: rgba(0, 255, 255, 0.6);
    border-style: solid;
    transition: all 0.3s
}

.holo-panel::before {
    top: -1px;
    left: -1px;
    border-width: 2px 0 0 2px
}

.holo-panel::after {
    bottom: -1px;
    right: -1px;
    border-width: 0 2px 2px 0
}

.planet-card {
    background: linear-gradient(180deg, rgba(20, 30, 48, 0.9), rgba(36, 59, 85, 0.9));
    border: 1px solid #4a5568;
    border-radius: 15px;
    padding: 20px;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden
}

.planet-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 25px rgba(66, 153, 225, 0.5);
    border-color: #63b3ed
}

.planet-card.selected {
    border-color: #f6e05e;
    box-shadow: 0 0 30px rgba(246, 224, 94, 0.4)
}

.planet-card.correct {
    border-color: #48bb78;
    box-shadow: 0 0 30px rgba(72, 187, 120, 0.6);
    background: rgba(72, 187, 120, 0.2)
}

.planet-card.wrong {
    border-color: #f56565;
    box-shadow: 0 0 30px rgba(245, 101, 101, 0.6);
    background: rgba(245, 101, 101, 0.2)
}

.planet-visual {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 15px;
    background: radial-gradient(circle at 30% 30%, var(--planet-color-1), var(--planet-color-2));
    box-shadow: inset -10px -10px 20px rgba(0, 0, 0, 0.5), 0 0 15px rgba(255, 255, 255, 0.1)
}/* High-quality claymation background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('clay_background.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    z-index: -1;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}