* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;

    font-family: Arial, sans-serif;

    color: white;

    background:
        radial-gradient(circle at 15% 20%, #312e81, transparent 28%),
        radial-gradient(circle at 85% 70%, #164e63, transparent 30%),
        linear-gradient(135deg, #020617, #111827);

    background-attachment: fixed;

    padding: 35px 20px;
}

/* Judul planet */

h1 {
    text-align: center;

    font-size: clamp(40px, 7vw, 65px);

    margin: 15px 0 30px;

    text-shadow:
        0 0 25px rgba(255,255,255,0.4);
}

/* Subjudul */

h2 {
    text-align: center;

    color: #facc15;

    font-size: 28px;

    margin-top: 30px;
}

/* Kotak informasi */

p {
    max-width: 850px;

    margin: 18px auto;

    padding: 22px;

    font-size: 17px;

    line-height: 1.8;

    text-align: left;

    background:
        rgba(255,255,255,0.08);

    border:
        1px solid rgba(255,255,255,0.15);

    border-radius: 20px;

    backdrop-filter: blur(10px);

    box-shadow:
        0 15px 35px rgba(0,0,0,0.25);
}

/* Gambar planet */

img {
    display: block;

    max-width: 90%;

    height: auto;

    margin: 20px auto;

    border-radius: 25px;

    box-shadow:
        0 20px 50px rgba(0,0,0,0.5);

    transition: 0.3s;
}

img:hover {
    transform: scale(1.04);
}

/* Tombol kembali */

a {
    display: inline-block;

    margin-top: 25px;

    padding: 13px 28px;

    color: white;

    text-decoration: none;

    font-weight: bold;

    background:
        rgba(255,255,255,0.12);

    border:
        1px solid rgba(255,255,255,0.18);

    border-radius: 30px;

    transition: 0.3s;
}

a:hover {
    transform: translateY(-3px);

    background:
        rgba(255,255,255,0.22);
}