:root{
--bg:#000;
--text:#fff;
--muted:#9ca3af;
--border:#1f1f1f;
--card:#0d0d0d;
--primary:#fff;
--primary-text:#000;
}

body.light{
--bg:#ffffff;
--text:#000000;
--muted:#555;
--border:#e5e5e5;
--card:#f5f5f5;
--primary:#000;
--primary-text:#fff;
}

*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:system-ui,-apple-system,BlinkMacSystemFont,sans-serif;
}

body{
background:var(--bg);
color:var(--text);
transition:0.3s ease;
}

.navbar{
display:flex;
justify-content:space-between;
align-items:center;
padding:20px 60px;
border-bottom:1px solid var(--border);
position:sticky;
top:0;
background:var(--bg);
z-index:100;
}

.logo{
font-weight:600;
font-size:18px;
}

.nav-links{
display:flex;
align-items:center;
gap:22px;
}

.nav-links a{
text-decoration:none;
color:var(--muted);
font-size:14px;
}

.nav-btn{
padding:7px 16px;
border-radius:20px;
border:1px solid var(--border);
background:transparent;
color:var(--text);
cursor:pointer;
font-size:13px;
}

.primary-nav{
background:var(--primary);
color:var(--primary-text);
border:none;
}

.theme-toggle{
padding:7px 14px;
border-radius:20px;
border:1px solid var(--border);
background:transparent;
color:var(--text);
cursor:pointer;
font-size:13px;
}

.menu-toggle{
display:none;
font-size:22px;
cursor:pointer;
}

.hero{
text-align:center;
padding:140px 20px 100px 20px;
max-width:900px;
margin:auto;
}

.hero h1{
font-size:64px;
font-weight:700;
margin-bottom:20px;
}

.hero p{
color:var(--muted);
font-size:18px;
margin-bottom:35px;
}

.hero-buttons{
display:flex;
justify-content:center;
gap:20px;
flex-wrap:wrap;
}

.primary-btn{
padding:14px 30px;
border-radius:30px;
border:none;
background:var(--primary);
color:var(--primary-text);
font-weight:500;
cursor:pointer;
}

.secondary-btn{
padding:14px 30px;
border-radius:30px;
border:1px solid var(--border);
background:transparent;
color:var(--text);
cursor:pointer;
}

.features{
display:flex;
justify-content:center;
gap:30px;
padding:100px 20px;
flex-wrap:wrap;
max-width:1100px;
margin:auto;
}

.feature-card{
background:var(--card);
border:1px solid var(--border);
border-radius:14px;
padding:40px 30px;
width:300px;
text-align:center;
transition:0.3s ease;
}

.feature-card:hover{
transform:translateY(-5px);
border-color:#333;
}

.feature-card h3{
margin-bottom:15px;
font-size:18px;
}

.feature-card p{
color:var(--muted);
font-size:14px;
}

.footer{
text-align:center;
padding:50px 20px;
border-top:1px solid var(--border);
color:var(--muted);
font-size:14px;
margin-top:60px;
}

@media(max-width:900px){

.hero h1{
font-size:42px;
}

.nav-links{
display:none;
position:absolute;
top:70px;
right:20px;
flex-direction:column;
background:var(--bg);
padding:20px;
border:1px solid var(--border);
border-radius:12px;
gap:15px;
}

.nav-links.active{
display:flex;
}

.menu-toggle{
display:block;
}

}

@media(max-width:500px){

.hero{
padding:100px 20px 60px 20px;
}

.hero h1{
font-size:32px;
}

.hero p{
font-size:15px;
}

.feature-card{
width:100%;
}

}