:root{
  --max: 980px;
  --pad: 18px;
  --border: #e7e7e7;
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height:1.6;
  color:#111;
  background:#fff;
}
a{ color:inherit; text-decoration: underline; }
a:hover{ opacity:.85; }

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

header{
  border-bottom: 1px solid var(--border);
  background:#fff;
  position: sticky;
  top:0;
}
.brand{
  display:flex;
  justify-content: space-between;
  align-items:center;
  gap: 14px;
  padding: 14px 0;
}
.brand .title{
  font-weight: 800;
  letter-spacing:.2px;
  text-decoration:none;
}
.brand .tag{
  font-size: 14px;
  opacity:.75;
}

nav{
  display:flex;
  flex-wrap:wrap;
  gap: 12px;
  padding: 0 0 14px 0;
}
nav a{
  text-decoration:none;
  padding: 8px 10px;
  border:1px solid var(--border);
  border-radius: 10px;
}
nav a:hover{ background:#f7f7f7; }

main{ padding: 28px 0 70px 0; }

h1{ font-size: 34px; margin: 0 0 10px 0; }
h2{ font-size: 22px; margin: 24px 0 10px 0; }
p{ margin: 10px 0; }

.card{
  border:1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  margin: 14px 0;
  background:#fff;
}
.grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
@media (max-width: 860px){
  .grid{ grid-template-columns: 1fr; }
  h1{ font-size: 30px; }
}

footer{
  border-top:1px solid var(--border);
  padding: 18px 0;
  opacity:.8;
  font-size: 14px;
}

.btn{
  display:inline-block;
  text-decoration:none;
  border:1px solid #111;
  border-radius: 12px;
  padding: 10px 12px;
}
.btn:hover{ background:#111; color:#fff; }

.whatsapp{
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 9999;
  text-decoration:none;
  border:1px solid var(--border);
  background:#fff;
  border-radius: 999px;
  padding: 12px 14px;
  box-shadow: 0 8px 26px rgba(0,0,0,.12);
}
.whatsapp strong{ text-decoration:none; }