:root{
--primary:#1e40af;
--accent:#2563eb;
--dark:#0f172a;
--bg:#f1f5f9;
}

*{box-sizing:border-box}

body{
margin:0;
font-family:Segoe UI,Arial,sans-serif;
background:linear-gradient(180deg,#ffffff,#e2e8f0);
color:#0f172a;
}

header{
background:linear-gradient(120deg,#1e3a8a,#2563eb,#0ea5e9);
color:white;
padding:70px 20px;
text-align:center;
}

header h1{margin:0;font-size:40px}
header p{font-size:18px;opacity:.95}

nav{
background:#0f172a;
text-align:center;
padding:14px;
}

nav a{
color:white;
text-decoration:none;
margin:6px;
padding:10px 18px;
border-radius:25px;
background:#2563eb;
display:inline-block;
font-size:14px;
}

.container{
max-width:1100px;
margin:auto;
padding:25px;
}

.card{
background:white;
padding:28px;
border-radius:12px;
box-shadow:0 10px 30px rgba(0,0,0,.08);
margin-bottom:25px;
}

.grid{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
gap:20px;
}

.feature{
background:#f8fafc;
padding:18px;
border-radius:10px;
}

.checkout{
display:flex;
flex-wrap:wrap;
gap:25px;
}

.checkout .card{flex:1 1 320px}
.summary{flex:1 1 250px;background:#f1f5f9}

input,textarea{
width:100%;
padding:12px;
margin-top:8px;
margin-bottom:12px;
border:1px solid #cbd5e1;
border-radius:6px;
}

button{
background:#2563eb;
color:white;
border:none;
padding:14px;
border-radius:8px;
cursor:pointer;
width:100%;
font-size:16px;
}

.amount-btn{
background:#1e40af;
margin:4px;
padding:10px 14px;
border:none;
border-radius:6px;
color:white;
}

footer{
background:#0f172a;
color:white;
text-align:center;
padding:35px;
margin-top:40px;
font-size:14px;
}