:root{
--bg:#ffffff;
--text:#111;
--accent:#ff6b3d;
--card:#f4f4f4;
}

body.dark{
--bg:#121212;
--text:#f4f4f4;
--card:#1e1e1e;
}

body{
margin:0;
font-family:Arial;
background:var(--bg);
color:var(--text);
transition:.3s;
}

header{
position:sticky;
top:0;
background:var(--bg);
border-bottom:1px solid #ddd;
}

.nav{
max-width:1100px;
margin:auto;
display:flex;
justify-content:space-between;
align-items:center;
padding:15px;
}

nav a{
margin:0 10px;
text-decoration:none;
color:var(--text);
font-weight:bold;
}

.hero{
text-align:center;
padding:100px 20px;
background:linear-gradient(135deg,#ff7a18,#ffb347);
color:white;
}

.btn{
display:inline-block;
margin-top:20px;
padding:12px 25px;
background:white;
color:black;
text-decoration:none;
border-radius:6px;
}

section{
max-width:1100px;
margin:auto;
padding:60px 20px;
}

.skills span{
display:inline-block;
background:var(--card);
padding:8px 15px;
margin:5px;
border-radius:20px;
}

.grid{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
gap:25px;
}

.card{
background:var(--card);
border-radius:10px;
overflow:hidden;
transition:transform .3s, box-shadow .3s;
}

.card:hover{
transform:translateY(-10px);
box-shadow:0 15px 30px rgba(0,0,0,.2);
}

.card img{
width:100%;
height:220px;
object-fit:cover;
}

.card h3{
margin:10px;
}

.card p{
margin:10px;
font-size:14px;
}

.prototype{
padding:20px;
text-align:center;
}

.prototype a{
display:inline-block;
margin-top:10px;
text-decoration:none;
font-weight:bold;
}

#contact{
text-align:center;
}

footer{
text-align:center;
padding:30px;
border-top:1px solid #ddd;
}