*{margin:0;padding:0;box-sizing:border-box}
body{
font-family:Arial,sans-serif;
background:#fff;
color:#111;
transition:.3s;
line-height:1.6
}
.container{width:90%;max-width:1200px;margin:auto}
header{
padding:20px 0;
position:sticky;
top:0;
background:#fff;
border-bottom:1px solid #eee;
z-index:999
}
nav{
display:flex;
justify-content:space-between;
align-items:center
}
nav ul{
display:flex;
gap:20px;
list-style:none
}
nav a{
text-decoration:none;
color:#111;
font-weight:600
}
#theme-toggle{
padding:10px 14px;
border:none;
border-radius:10px;
cursor:pointer
}
.hero{
padding:100px 0;
display:grid;
grid-template-columns:1fr 1fr;
gap:40px;
align-items:center
}
.hero h1{
font-size:58px;
line-height:1.1;
margin-bottom:20px
}
.hero span{color:#5B5CFF}
.card-grid{
display:grid;
grid-template-columns:repeat(3,1fr);
gap:25px;
padding:60px 0
}
.card{
padding:30px;
background:#f7f7f7;
border-radius:20px;
transition:.3s
}
.card:hover{transform:translateY(-5px)}
.btn{
display:inline-block;
margin-top:20px;
padding:14px 28px;
background:#5B5CFF;
color:#fff;
border-radius:12px;
text-decoration:none
}
.page-banner{
padding:80px 0;
text-align:center
}
footer{
padding:40px 0;
text-align:center;
border-top:1px solid #eee;
margin-top:60px
}
body.dark-mode{
background:#0D0D0F;
color:#fff
}
body.dark-mode header{
background:#111;
border-color:#222
}
body.dark-mode nav a{
color:#fff
}
body.dark-mode .card{
background:#18181b
}
@media(max-width:992px){
.hero{grid-template-columns:1fr}
.card-grid{grid-template-columns:1fr}
.hero h1{font-size:42px}
nav ul{gap:10px;flex-wrap:wrap}
}