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

body {
    font-family: 'Poppins', sans-serif;
    background-color: #0a0a1a;
    color: #ffffff;
    line-height: 1.6;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5rem;
    background: linear-gradient(90deg, #00001a, #1a1a3d);
    box-shadow: 0px 4px 10px rgba(255, 255, 255, 0.1);
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    color: #a7a7ff;
}

nav a {
    color: #ffffff;
    text-decoration: none;
    margin: 0 1.5rem;
    font-weight: 400;
    transition: color 0.3s ease, transform 0.2s ease;
}

nav a:hover {
    color: #a7a7ff;
    transform: scale(1.1);
}

.hero {
    text-align: center;
    padding: 6rem 2rem;
    background: url('space.jpg') no-repeat center center/cover;
    box-shadow: inset 0 0 100px rgba(0, 0, 0, 0.5);
}

.hero h2 {
    font-size: 3.5rem;
    font-weight: 700;
    text-shadow: 2px 2px 10px rgba(255, 255, 255, 0.3);
}

.hero p {
    font-size: 1.4rem;
}

.content-section {
    padding: 4rem 5rem;
    text-align: center;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.planet-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0px 4px 10px rgba(255, 255, 255, 0.1);
}

.planet-card:hover {
    transform: scale(1.05);
    box-shadow: 0px 6px 15px rgba(255, 255, 255, 0.2);
}

.nebula-box {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 3rem;
    margin: 4rem auto;
    text-align: center;
    max-width: 800px;
    border-radius: 12px;
    box-shadow: 0px 4px 15px rgba(255, 255, 255, 0.2);
}

.nebula-box h2 {
    margin-bottom: 1.5rem;
    color: #a7a7ff;
}

.nebula-box p {
    margin-bottom: 2rem;
    font-size: 1.2rem;
}

.nebula-3d {
    width: 100%;
    height: 500px;
    margin-top: 1.5rem;
    border-radius: 10px;
}

footer {
    text-align: center;
    padding: 2.5rem;
    background: linear-gradient(90deg, #00001a, #1a1a3d);
    box-shadow: 0px -4px 10px rgba(255, 255, 255, 0.1);
}

/* Ensure all images fit well within their sections */
.hero-image {
    width: 80%;
    max-width: 600px;
    height: auto;
    display: block;
    margin: 20px auto;
}

/* Standardize content images */
.content-image {
    width: 100%;
    max-width: 500px;
    height: auto;
    display: block;
    margin: 20px auto;
}

/* Planet images should be proportional */
.planet-image {
    width: 100%;
    max-width: 150px;
    height: auto;
    display: block;
    margin: 10px auto;
}

/* Ensure the grid layout keeps images aligned */
.grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

.planet-card {
    width: 250px;
    text-align: center;
}

.nebula-3d {
    width: 100%;
    max-width: 600px;
    height: 400px;
    display: block;
    margin: 20px auto;
}

/* Responsive Design for Mobile Screens */
@media (max-width: 768px) {
    .hero-image, .content-image, .planet-image {
        max-width: 90%;
    }
    .grid {
        flex-direction: column;
        align-items: center;
    }
}

/* Robot Container (Left and Right) */
.robot-container {
    position: fixed; /* Keeps it fixed on the screen */
    top: 50%; /* Center it vertically */
    transform: translateY(-50%); /* Adjust for perfect centering */
    width: 300px; /* Box width */
    height: 400px; /* Box height */
    border: 3px solid rgba(255, 255, 255, 0.7); /* Light border */
    border-radius: 10px; /* Smooth corners */
    background: rgba(0, 0, 0, 0.5); /* Semi-transparent dark background */
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3); /* Glow effect */
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 3D Robot Viewer */
.robot-3d {
    width: 100%;
    height: 100%;
    border-radius: 10px;
}

/* Robot on the Left */
.robot-container.left {
    left: 20px; /* Position it to the left */
}

/* Robot on the Right */
.robot-container.right {
    right: 20px; /* Position it to the right */
}

/* Responsive Adjustments */
@media (max-width: 1024px) {
    .robot-container {
        width: 250px;
        height: 350px;
    }
}

@media (max-width: 768px) {
    .robot-container {
        display: none; /* Hide the robots on smaller screens */
    }
}