:root{
--bg:#0b0f17;
--panel:#111827;
--text:#e5e7eb;
--muted:#9ca3af;
--accent:#7c3aed;
--line:rgba(255,255,255,.08);
}

*{box-sizing:border-box}
body{
margin:0;
font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
background:var(--bg);
color:var(--text);
line-height:1.6;
}

.container{
max-width:1100px;
margin:auto;
padding:20px;
}

.site-header{
background:#0f172a;
border-bottom:1px solid var(--line);
position:sticky;
top:0;
z-index:100;
}

.header-inner{
display:flex;
align-items:center;
justify-content:space-between;
}

.site-nav a{
color:var(--muted);
text-decoration:none;
margin-left:18px;
font-weight:600;
}

.site-nav a:hover{
color:#fff;
}

h1{
font-size:42px;
margin-bottom:16px;
}

h2{
margin-top:40px;
font-size:24px;
}

p{
color:var(--muted);
}

ul{
color:var(--muted);
}

.section{
padding:60px 0;
}

.card{
background:var(--panel);
padding:20px;
border-radius:12px;
border:1px solid var(--line);
margin-bottom:20px;
}

.btn{
display:inline-block;
padding:10px 16px;
border-radius:8px;
text-decoration:none;
font-weight:600;
}

.btn.ghost{
border:1px solid var(--line);
color:#fff;
}

.site-footer{
border-top:1px solid var(--line);
margin-top:60px;
padding:30px 0;
color:var(--muted);
}

@media(max-width:768px){
h1{font-size:30px}
.site-nav{display:flex;flex-wrap:wrap}
}