*{
margin:0;
padding:0;
box-sizing:border-box;
}

body{
font-family:Arial,sans-serif;
background:#f6fff8;
color:#222;
}

header{
background:linear-gradient(135deg,#081c15,#0f5132);
color:white;
padding:50px 20px;
text-align:center;
}

header h1{
font-size:2rem;
line-height:1.3;
max-width:1000px;
margin:auto;
}

.back-wrap{
text-align:center;
margin-top:20px;
}

.back-btn{
display:inline-block;
padding:12px 22px;
background:#0f5132;
color:white;
text-decoration:none;
border-radius:14px;
transition:.3s;
font-weight:bold;
}

.back-btn:hover{
transform:translateY(-3px);
background:#146c43;
}

nav{
max-width:1200px;
margin:40px auto;
padding:0 20px;

display:grid;
grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
gap:18px;
}

nav a{
display:flex;
align-items:center;
justify-content:center;

min-height:90px;

text-decoration:none;
text-align:center;

padding:20px;

background:white;
border-radius:18px;

color:#0f5132;
font-weight:bold;
font-size:1rem;

box-shadow:0 10px 25px rgba(0,0,0,.08);

transition:.35s;
}

nav a:hover{
transform:translateY(-6px);
background:#eefcf1;
}

.container{
max-width:1100px;
margin:auto;
padding:40px 20px;
}

.card{
background:white;
padding:30px;
border-radius:20px;
box-shadow:0 10px 25px rgba(0,0,0,.08);
}

@media(max-width:768px){

header{
padding:40px 15px;
}

header h1{
font-size:1.45rem;
}

nav{
grid-template-columns:1fr;
gap:15px;
margin:30px auto;
}

nav a{
min-height:75px;
font-size:.95rem;
padding:18px;
border-radius:16px;
}

.back-btn{
width:90%;
max-width:320px;
}

.card{
padding:22px;
border-radius:16px;
}

}