/* Google Font */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

/* Reset */
*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

html{
    scroll-behavior:smooth;
}

body{
    font-family:'Poppins', sans-serif;
    color:white;
    min-height:100vh;

    background:
    radial-gradient(circle at top, #1b2735 0%, #090a0f 60%, #050816 100%);

    overflow-x:hidden;
}

/* Navbar */
.navbar{
    position:sticky;
    top:0;
    z-index:1000;

    display:flex;
    justify-content:space-between;
    align-items:center;

    padding:20px 7%;

    background:rgba(255,255,255,0.05);
    backdrop-filter:blur(12px);
    border-bottom:1px solid rgba(255,255,255,0.1);
}

.navbar h1{
    font-size:1.6rem;
    font-weight:600;
}

.navbar ul{
    display:flex;
    gap:25px;
    list-style:none;
}

.navbar a{
    color:white;
    text-decoration:none;
    font-weight:500;
    transition:0.3s ease;
}

.navbar a:hover{
    color:#8d7dff;
}

/* Hero Section */
.hero{
    min-height:80vh;

    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;

    text-align:center;
    padding:40px 20px;
}

.hero h2{
    font-size:clamp(2.5rem, 6vw, 4.5rem);
    line-height:1.1;
    margin-bottom:20px;

    background:linear-gradient(90deg,#ffffff,#8d7dff);
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
}

.hero p{
    max-width:650px;
    font-size:1.1rem;
    color:#d1d1d1;
    margin-bottom:35px;
}

/* Button */
button{
    padding:14px 32px;
    border:none;
    border-radius:50px;

    background:linear-gradient(
        135deg,
        #7b5cff,
        #9a84ff
    );

    color:white;
    font-size:1rem;
    font-weight:600;

    cursor:pointer;

    transition:0.3s ease;
    box-shadow:0 10px 25px rgba(123,92,255,0.35);
}

button:hover{
    transform:translateY(-4px);
    box-shadow:0 15px 30px rgba(123,92,255,0.5);
}

/* Facts Section */
.facts{
    display:grid;
    grid-template-columns:
    repeat(auto-fit,minmax(260px,1fr));

    gap:30px;
    padding:80px 7%;
}

/* Cards */
.card{
    background:rgba(255,255,255,0.06);
    backdrop-filter:blur(12px);

    border:1px solid rgba(255,255,255,0.1);
    border-radius:20px;

    padding:30px;
    text-align:center;

    transition:0.4s ease;
}

.card:hover{
    transform:translateY(-10px);
    border-color:#7b5cff;
    box-shadow:0 15px 40px rgba(123,92,255,0.25);
}

.card h3{
    font-size:1.5rem;
    margin-bottom:15px;
}

.card p{
    color:#d8d8d8;
    line-height:1.6;
}

/* Optional Link Button */
.btn{
    display:inline-block;
    margin-top:18px;

    padding:12px 20px;
    border-radius:12px;

    background:#5f7cff;
    color:white;
    text-decoration:none;

    transition:0.3s;
}

.btn:hover{
    background:#7b95ff;
    transform:translateY(-2px);
}

/* Mobile */
@media (max-width:768px){

    .navbar{
        flex-direction:column;
        gap:15px;
        padding:20px;
    }

    .navbar ul{
        flex-wrap:wrap;
        justify-content:center;
        gap:15px;
    }

    .hero{
        min-height:70vh;
    }

    .hero p{
        font-size:1rem;
    }

    .facts{
        padding:60px 20px;
    }
}

/* Overlay */
.popup{
    position: fixed;
    inset: 0;

    background: rgba(0,0,0,0.8);

    display: flex;
    justify-content: center;
    align-items: center;

    opacity: 0;
    visibility: hidden;

    transition: 0.3s;
}

/* Open popup */
.popup:target{
    opacity: 1;
    visibility: visible;
}

/* Popup box */
.popup-content{
    background: #11152a;
    color: white;

    width: 90%;
    max-width: 700px;

    max-height: 80vh;
    overflow-y: auto;

    padding: 30px;
    border-radius: 20px;

    position: relative;
}

/* Close button */
.close{
    position: absolute;
    top: 15px;
    right: 20px;

    color: white;
    font-size: 30px;
    text-decoration: none;
}.card{
    background:rgba(255,255,255,0.07);
    backdrop-filter:blur(15px);

    border:1px solid rgba(255,255,255,0.1);
    border-radius:20px;

    padding:25px;
    text-align:center;

    transition:0.4s ease;

    box-shadow:
    0 10px 30px rgba(0,0,0,0.3);

    overflow:hidden;
}

.card:hover{
    transform:translateY(-10px);

    border-color:#7b5cff;

    box-shadow:
    0 20px 40px rgba(123,92,255,0.3);
}

.card h3{
    margin-top:15px;
    margin-bottom:10px;
    font-size:1.5rem;
}

.card p{
    color:#d7d7d7;
}

.popup:target {
    display: block;
}

.popup{
    position:fixed;
    inset:0;

    background:rgba(0,0,0,0.8);

    display:flex;
    justify-content:center;
    align-items:center;

    opacity:0;
    visibility:hidden;

    transition:0.3s;
}

.popup:target{
    opacity:1;
    visibility:visible;
}

.popup-content{
    background:#121826;

    width:90%;
    max-width:700px;

    max-height:85vh;
    overflow-y:auto;

    padding:30px;

    border-radius:20px;

    position:relative;

    box-shadow:
    0 0 40px rgba(123,92,255,0.4);
}

.popup-content h2{
    margin-bottom:20px;
    text-align:center;
}

.popup-content ol{
    line-height:1.8;
    padding-left:20px;
}

.close{
    position:absolute;
    right:20px;
    top:15px;

    font-size:35px;
    color:white;
    text-decoration:none;
}

.close {
    float: right;
    font-size: 24px;
    text-decoration: none;
}.planet-img{
    width:100%;
    max-width:200px;
    height:auto;
    display:block;
    margin:auto;
    transition:0.4s;
}

.card:hover .planet-img{
    transform:scale(1.08);
}.intro{
    text-align: center;
    padding: 40px 20px;
}

.intro h3{
    font-size: 1.8rem;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.5;
}.center-title{
    text-align: center;
    margin: 40px auto;
    padding: 0 20px;
    font-size: 1.8rem;
    max-width: 800px;
    line-height: 1.5;
}