/* ======= Base ======= */
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f9fafb;
  color: #1f2937;
}

/* ======= Navbar ======= */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 40px;
  background: white;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 10;
}
header h1 {
  font-size: 20px;
  margin: 0;
  font-weight: bold;
}
nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #374151;
  font-size: 15px;
}
nav a:hover {
  color: #111827;
}

/* ======= Botões genéricos ======= */
.btn {
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 15px;
  cursor: pointer;
  border: none;
  text-decoration: none;
  display: inline-block;
}
.btn-dev { background: #111827; color: white; }
.btn-free { background: #257B3A; color: white; }
.btn-pro { background: #3E4095; color: white; }
.btn-secondary {
  background: white;
  border: 1px solid #d1d5db;
  color: #111827;
}
.btn:hover { opacity: .9; }

/* ======= Footer ======= */
footer {
  background: #111827;
  color: white;
  padding: 20px;
  text-align: center;
}
footer a { color: #6b7280; }
footer a:hover { color: white; }