body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    color: #e6e9ff;
    background: #000;
    overflow-x: hidden;
}

/* Background layers */
.bg-stars {
    background: url('https://images-assets.nasa.gov/image/PIA04921/PIA04921~orig.jpg') repeat;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: -3;
}

.bg-nebula {
    background: radial-gradient(circle at 50% 50%, rgba(120,0,200,0.4), transparent 70%);
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: -2;
}

/* Header */
.masthead {
    text-align: center;
    padding: 40px 20px;
    background: rgba(20, 20, 40, 0.6);
    backdrop-filter: blur(6px);
    border-bottom: 2px solid #4477cc;
}

.header-img {
    width: 100%;
    max-height: 300px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 20px;
}

.masthead h1 {
    font-size: 3rem;
    color: #7ab6ff;
    text-shadow: 0 0 15px #4477cc;
}

.masthead h3 {
    font-size: 1.4rem;
    color: #cdd9ff;
}

/* Navigation */
.navigation ul {
    list-style: none;
    margin: 0;
    padding: 15px;
    display: flex;
    justify-content: center;
    gap: 25px;
    background: rgba(10, 10, 25, 0.7);
    border-bottom: 1px solid #3355aa;
}

.navigation a {
    color: #aaccff;
    text-decoration: none;
    font-weight: bold;
    padding: 8px 14px;
    border-radius: 6px;
    transition: 0.3s;
}

.navigation a:hover {
    background: #3355aa;
    color: white;
    box-shadow: 0 0 10px #4477cc;
}

/* Content */
.content {
    max-width: 900px;
    margin: 60px auto;
    padding: 20px;
    background: rgba(15, 15, 35, 0.6);
    border-radius: 12px;
    backdrop-filter: blur(4px);
    box-shadow: 0 0 20px rgba(68,119,204,0.4);
}

.content h2 {
    font-size: 2rem;
    color: #88bbff;
    text-shadow: 0 0 10px #4477cc;
}

/* Feature images */
.feature-images {
    display: flex;
    gap: 20px;
    margin-top: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.feature-images img {
    width: 280px;
    height: 180px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(68,119,204,0.5);
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    background: rgba(10, 10, 25, 0.7);
}

.footer a {
    color: #aaccff;
    text-decoration: none;
}

.footer a:hover {
    color: #ffffff;
}