body{
font-family: Arial, sans-serif;
background:#f5f7fa;
margin:0;
}

.container{
width:1000px;
margin:auto;
}

header{
background:#1a1a1a;
color:white;
padding:20px 0;
}

nav a{
color:white;
margin-right:20px;
text-decoration:none;
}

.hero{
padding:60px 0;
}

.btn{
background:#2979ff;
color:white;
padding:12px 20px;
text-decoration:none;
border-radius:4px;
}

.features{
display:flex;
gap:40px;
padding:40px 0;
}

.feature{
background:white;
padding:20px;
box-shadow:0 2px 10px rgba(0,0,0,0.1);
}

.login-container{
width:360px;
margin:100px auto;
background:white;
padding:40px;
box-shadow:0 3px 15px rgba(0,0,0,0.15);
}

.login-container input{
width:100%;
padding:10px;
margin-bottom:15px;
}

.login-container button{
width:100%;
padding:12px;
background:#2979ff;
border:none;
color:white;
}

#error{
margin-top:10px;
color:red;
}