* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  background: #f4f6f8;
  color: #222;
}

header {
  background: linear-gradient(135deg, #0b5ed7, #084298);
  color: #fff;
  padding: 22px 15px;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 26px;
}

header p {
  margin-top: 6px;
  font-size: 15px;
}

nav {
  background: #084298;
  padding: 10px;
  text-align: center;
}

nav a {
  color: #fff;
  text-decoration: none;
  margin: 0 10px;
  font-weight: 600;
  font-size: 14px;
}

nav a:hover {
  text-decoration: underline;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 20px 15px;
}

.card {
  background: #fff;
  border-radius: 8px;
  padding: 18px;
  margin-bottom: 18px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.06);
}

.card h2, .card h3 {
  margin-top: 0;
}

.btn {
  display: inline-block;
  background: #198754;
  color: #fff;
  padding: 11px 18px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.btn-whatsapp {
  background: #25D366;
}

footer {
  background: #212529;
  color: #fff;
  text-align: center;
  padding: 14px;
  font-size: 13px;
}

.floating-whatsapp {
  position: fixed;
  right: 18px;
  bottom: 18px;
  background: #25D366;
  color: #fff;
  padding: 15px;
  border-radius: 50%;
  font-size: 22px;
  text-decoration: none;
  z-index: 999;
}