*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial,sans-serif;
}

html{
    scroll-behavior:smooth;
}

body{
    background:#0f172a;
    color:white;
}

/* HEADER */

header{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:20px 8%;
    background:#111827;
    box-shadow:0 5px 20px rgba(0,0,0,.4);
    z-index:1000;
}

.logo{
    font-size:28px;
    font-weight:bold;
    color:#38bdf8;
}

nav a{
    color:white;
    text-decoration:none;
    margin-left:25px;
    transition:.3s;
    font-size:17px;
}

nav a:hover{
    color:#38bdf8;
}

/* HERO */

.hero{
    height:100vh;
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    text-align:center;
    background:linear-gradient(135deg,#0f172a,#1e3a8a,#2563eb);
    padding:20px;
}

.hero h1{
    font-size:55px;
    margin-bottom:20px;
}

.hero p{
    font-size:22px;
    color:#d1d5db;
    margin-bottom:35px;
    max-width:700px;
}

.hero button{
    padding:18px 45px;
    font-size:20px;
    border:none;
    border-radius:50px;
    cursor:pointer;
    background:#22c55e;
    color:white;
    transition:.3s;
}

.hero button:hover{
    transform:translateY(-5px);
    background:#16a34a;
    box-shadow:0 10px 30px rgba(34,197,94,.5);
}

/* SUBJECTS */

#subjects{
    padding:90px 8%;
}

#subjects h2{
    text-align:center;
    margin-bottom:45px;
    font-size:40px;
}

.subjects{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:25px;
}

.card{
    background:#1e293b;
    border-radius:20px;
    padding:25px;
    text-align:center;
    transition:.35s;
    box-shadow:0 10px 25px rgba(0,0,0,.25);
}

.card:hover{
    transform:translateY(-10px);
    box-shadow:0 15px 35px rgba(56,189,248,.35);
}

.card h3{
    margin-bottom:15px;
    color:#38bdf8;
}

.card p{
    color:#d1d5db;
    line-height:1.6;
    margin-bottom:20px;
}

.card button{
    width:100%;
    padding:14px;
    border:none;
    border-radius:12px;
    cursor:pointer;
    background:#2563eb;
    color:white;
    font-size:17px;
    transition:.3s;
}

.card button:hover{
    background:#1d4ed8;
}

/* ABOUT */

#about{
    padding:90px 8%;
    text-align:center;
}

#about h2{
    font-size:40px;
    margin-bottom:20px;
}

#about p{
    max-width:900px;
    margin:auto;
    line-height:1.8;
    color:#d1d5db;
    font-size:18px;
}

/* CONTACT */

#contact{
    padding:90px 8%;
    text-align:center;
}

#contact h2{
    font-size:40px;
    margin-bottom:25px;
}

#contact p{
    margin:15px 0;
    font-size:18px;
}

#contact a{
    color:#38bdf8;
    text-decoration:none;
}

#contact a:hover{
    color:#22c55e;
}

/* FOOTER */

footer{
    background:#111827;
    text-align:center;
    padding:25px;
    color:#d1d5db;
    margin-top:80px;
}

/* SCROLLBAR */

::-webkit-scrollbar{
    width:10px;
}

::-webkit-scrollbar-track{
    background:#0f172a;
}

::-webkit-scrollbar-thumb{
    background:#38bdf8;
    border-radius:20px;
}

::-webkit-scrollbar-thumb:hover{
    background:#0ea5e9;
}

/* ANIMATIONS */

@keyframes fadeUp{

    from{

        opacity:0;
        transform:translateY(40px);

    }

    to{

        opacity:1;
        transform:translateY(0);

    }

}

.hero,
.card,
#about,
#contact{

    animation:fadeUp .9s ease;

}

/* MOBILE */

@media(max-width:900px){

header{

flex-direction:column;
gap:20px;

}

nav{

display:flex;
flex-wrap:wrap;
justify-content:center;

}

nav a{

margin:8px;

}

.hero h1{

font-size:38px;

}

.hero p{

font-size:18px;

}

#subjects h2,
#about h2,
#contact h2{

font-size:32px;

}

}