/* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

/* Estrutura para ocupar 100% da altura e posicionar footer */
html, body {
  height: 100%;
  display: flex;
  flex-direction: column;
  color: white;
  background: linear-gradient(rgba(0, 0, 0, 0.829), rgba(0, 0, 0, 0.829)), url("../assents/img/fundocontato.png");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  margin: 0;
}

/* Cabeçalho do site */
#Nplanos {
  font-family: helvetica;
  background-color: black;
  padding: 8px;
  text-align: center;
}

h2 {
  font-family: gill sans;
}

span {
  font-family: gill sans;
  color: yellow;
}

/* Header da página */
header {
  text-align: center;
  padding: 40px 20px 10px 20px;
}

/* Botão voltar abaixo do header, alinhado à esquerda no desktop */
.voltar {
  position: relative; /* no fluxo natural */
  max-width: 900px;
  margin: 0 0 20px 10px;
  text-align: left;
}

/* Estilo do link voltar */
.voltar a {
  color: white;
  font-size: 30px;
  text-decoration: none;
  transition: color 0.3s;
}

.voltar a:hover {
  color: yellow;
}

/* Container do formulário */
main.contact-container {
  flex: 1; /* ocupa espaço restante para empurrar footer para baixo */
  max-width: 600px;
  margin: 0 auto;
  padding: 0 20px 40px 20px;
  width: 100%;
}

/* Estilo do formulário */
.contact-form {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.contact-form label {
  margin-top: 15px;
  font-weight: bold;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border: 1px solid #ffffff;
  border-radius: 6px;
  font-size: 16px;
  background-color: rgb(0, 0, 0);
  color: #ffffff;
}

.contact-form button {
  width: 100%;
  margin-top: 20px;
  padding: 12px;
  background-color: yellow;
  color: rgb(0, 0, 0);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 16px;
}

.contact-form button:hover {
  background-color: #cc9600;
}

/* Rodapé */
.footer {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  background-color: #000000;
  color: white;
  padding: 0px 2px;
}

.footer-column {
  margin: 20px;
  min-width: 200px;
}

.footer-column h3 {
  margin-bottom: 15px;
}

.footer-column ul {
  list-style: none;
}

.footer-column ul li a {
  color: #ddd;
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
}

.footer-column ul li a:hover {
  text-decoration: underline;
}

.footer-copy {
  width: 100%;
  text-align: center;
  margin-top: 20px;
  padding-bottom: 20px;
  font-size: 14px;
  color: #ccc;
}

/* ======== RESPONSIVO ======== */

@media screen and (max-width: 900px) {
  /* Centraliza o botão voltar */
  .voltar {
    position: static;
    max-width: none;
    margin: 20px auto 30px auto;
    text-align: center;
  }

  main.contact-container {
    width: 90%;
    padding: 0 10px 40px 10px;
  }
}

@media screen and (max-width: 480px) {
  h1, h2 {
    font-size: 1.2em;
  }

  .contact-form button {
    font-size: 14px;
  }
}