:root {
  --bg:#f7f9fc;
  --card:#ffffff;
  --text:#1d2433;
  --muted:#667085;
  --border:#e5e7eb;
  --primary:#4f46e5;
  --primary-dark:#3730a3;
  --max-width:1100px;
}

*{
    box-sizing:border-box;
}

body{
    margin:0;
    font-family:Inter,Arial,sans-serif;
    background:var(--bg);
    color:var(--text);
    line-height:1.7;
}

header{
    background:#fff;
    border-bottom:1px solid var(--border);
    position:sticky;
    top:0;
}

.container{
    max-width:var(--max-width);
    margin:auto;
    padding:0 24px;
}

nav{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:20px 0;
}

.logo{
    font-size:24px;
    font-weight:700;
    color:var(--primary);
    text-decoration:none;
}

.menu{
    display:flex;
    gap:22px;
}

.menu a{
    text-decoration:none;
    color:#444;
}

.menu a:hover{
    color:var(--primary);
}

.hero{
    padding:80px 0;
}

.hero h1{
    font-size:52px;
    margin-bottom:20px;
}

.hero p{
    max-width:700px;
    color:var(--muted);
    font-size:20px;
}

.button{
    display:inline-block;
    margin-top:30px;
    background:var(--primary);
    color:white;
    padding:14px 22px;
    border-radius:8px;
    text-decoration:none;
}

.button:hover{
    background:var(--primary-dark);
}

.card{
    background:white;
    border:1px solid var(--border);
    border-radius:12px;
    padding:30px;
    margin:25px 0;
}

footer{
    margin-top:70px;
    border-top:1px solid var(--border);
    background:white;
}

footer .container{
    padding:30px 24px;
    color:var(--muted);
    font-size:14px;
}

h1,h2,h3{
    line-height:1.2;
}

ul{
    padding-left:20px;
}

code{
    background:#eef2ff;
    padding:2px 6px;
    border-radius:5px;
}

.notice{
    border-left:4px solid var(--primary);
    background:#eef2ff;
    padding:16px;
    margin:25px 0;
}

@media(max-width:768px){

.hero h1{
font-size:36px;
}

nav{
flex-direction:column;
gap:20px;
}

.menu{
flex-wrap:wrap;
justify-content:center;
}

}