:root{
  --bg:#f7f9fc;
  --card:#ffffff;
  --accent:#0b6efd;
  --muted:#6b7280;
  --maxw:900px;
  --radius:10px;
  --shadow: 0 6px 18px rgba(15,23,42,0.08);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

*{box-sizing:border-box}
body{
  margin:0;
  background:linear-gradient(180deg,#eef2ff 0%,var(--bg) 100%);
  color:#0f172a;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.6;
}

.site-header{
  background:var(--card);
  padding:18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  box-shadow:var(--shadow);
}
.site-header h1{margin:0;font-size:1.1rem}
nav a{color:var(--muted);text-decoration:none;margin-left:12px;padding:8px 10px;border-radius:8px}
nav a.active, nav a:hover{background:#eef2ff;color:var(--accent)}

.container{
  max-width:var(--maxw);
  margin:28px auto;
  padding:20px;
  background:transparent;
}

section{background:var(--card);padding:18px;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:16px}
h2{margin-top:0;color:#07204a}
.ad-slot{margin:12px 0;padding:12px;border-radius:8px;background:#fff;border:1px dashed #e6eef8;text-align:center}
.cta{text-align:right}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:10px 14px;border-radius:8px;text-decoration:none}
.notes ul{margin:0;padding-left:18px;color:var(--muted)}
footer{max-width:var(--maxw);margin:0 auto 40px auto;padding:12px;text-align:center;color:var(--muted)}
@media (max-width:640px){
  .site-header{flex-direction:column;align-items:flex-start}
  nav a{margin-left:0;margin-top:8px}
}