:root{
  --primary:#4f46e5;
  --primary-dark:#4338ca;
  --bg:#f5f7fb;
  --border:#e5e7eb;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:system-ui, Arial;
  background:var(--bg);
  color:#111827;
}

/* HEADER */
.site-header{
  background:#fff;
  border-bottom:1px solid var(--border);
  position:sticky;
  top:0;
  z-index:1000;
}
.nav-bar{
  max-width:1100px;
  margin:auto;
  padding:14px 20px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.site-title{
  font-size:18px;
  font-weight:700;
  color:#111827;
  text-decoration:none;
}
.site-title:hover{color:var(--primary)}
.nav-links a{
  margin-left:18px;
  text-decoration:none;
  font-size:14px;
  color:#374151;
}
.nav-links a:hover{color:var(--primary)}
.nav-links a.active{
  color:var(--primary);
  font-weight:600;
}

/* MOBILE */
.menu-toggle{display:none;font-size:22px;cursor:pointer}
@media(max-width:900px){
  .menu-toggle{display:block}
  .nav-links{
    display:none;
    position:absolute;
    top:60px;
    left:0;
    width:100%;
    background:#fff;
    flex-direction:column;
    border-top:1px solid var(--border);
  }
  .nav-links.show{display:flex}
  .nav-links a{
    padding:14px 20px;
    border-bottom:1px solid #f3f4f6;
    margin:0;
  }
}

/* FOOTER */
.site-footer{
  background:#fff;
  border-top:1px solid var(--border);
  text-align:center;
  padding:24px;
  font-size:13px;
  color:#6b7280;
}
.site-footer a{
  color:var(--primary);
  text-decoration:none;
  margin:0 6px;
}

body{
  padding-top: 70px;
}
section{
  margin-top: 20px;
}