/* Reset básico */
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow-x: hidden;
  /* elimina scroll lateral */
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

/* Barra de navegação fixa */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 50px;
  background-color: rgb(0, 0, 0);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  padding: 0 1rem;
  box-sizing: border-box;
  z-index: 1000;
}

/* Estilo base dos botões */
.btn {
  border: 1px solid rgba(255, 255, 255, 0.6);
  background-color: rgba(255, 255, 255, 0.1);
  color: #fff;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  border-radius: 8px;
  cursor: pointer;
  text-align: center;
  transition: background-color 0.3s ease, transform 0.2s ease;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.btn:hover {
  background-color: rgba(255, 255, 255, 0.25);
  transform: scale(1.05);
}

/* Botão HOME */
.btn-home {
  /* mesmo estilo base, mas pode ter cor diferente se quiser */
}

/* Botão HOME fixo nas outras páginas */
.btn-home-fixed {
  position: fixed;
  top: 0.5rem;
  left: 1rem;
  z-index: 1000;
}

/* Botão azul */
.btn-blue {
  background-color: blue;
  border-color: blue;
  color: white;
}

.btn-blue:hover {
  background-color: darkblue;
  transform: scale(1.05);
}

/* Botão amarelo */
.btn-yellow {
  background-color: yellow;
  border-color: yellow;
  color: black;
}

.btn-yellow:hover {
  background-color: gold;
  transform: scale(1.05);
}

/* Fundo principal */
.background {
  background-image: url('../img/zeley.png');
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  background-attachment: fixed;
  height: 100vh;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: #fff;
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.7);
  padding-top: 70px;
  /* espaço para não ficar atrás da navbar */
  box-sizing: border-box;
}

/* Footer transparente sobre o fundo */
footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 20px;
  background-color: rgba(0, 0, 0, 0.1);
  color: #fff;
  display: flex;
  justify-content: left;
  align-items: center;
  font-size: 0.9rem;
  z-index: 1100;
}

/* Responsividade */
@media (max-width: 600px) {
  .navbar {
    flex-direction: column;
    height: auto;
    padding: 0.5rem;
    gap: 0.5rem;
  }

  .btn {
    font-size: 0.9rem;
    padding: 0.6rem 0.8rem;
  }
}