/* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f9f9f9;
  color: #333;
  line-height: 1.6;
  font-size: 16px;
}

header {
  background-color: #ffffff;
  padding: 20px;
  border-bottom: 1px solid #ddd;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

header h1 {
  color: #222;
  font-size: 2rem;
}

nav {
  margin-top: 10px;
}

nav a {
  text-decoration: none;
  color: #0077cc;
  margin: 0 15px;
  font-weight: 500;
}

nav a:hover {
  color: #005fa3;
}

/* Layout principal */
.container {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 20px;
}

section {
  margin-bottom: 40px;
}

/* Botões */
button,
.btn {
  background-color: #0077cc;
  color: #fff;
  border: none;
  padding: 12px 24px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.3s ease;
}

button:hover,
.btn:hover {
  background-color: #005fa3;
}

/* Rodapé */
footer {
  background-color: #f1f1f1;
  text-align: center;
  padding: 20px;
  color: #666;
  border-top: 1px solid #ddd;
  font-size: 0.9rem;
}

/* Responsividade */
@media (max-width: 768px) {
  nav {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  nav a {
    margin: 10px 0;
  }
}