body {
  font-family: Arial, Helvetica, sans-serif;
  text-justify: auto;
  background-image: url(img/fundo-techo.jpg);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  margin: 0;
  padding: 0;
}

header {
  background: #0a58ca;
  color: white;
  padding: 20px;

  /*Fixa o menu*/
  position: sticky; 
  top: 0;
  /*z-index: 1000;*/
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  backdrop-filter: blur(10px);
}

header h1 {
  margin: 0;
}

nav a {
  color: white;
  margin-right: 15px;
  text-decoration: none;
  font-weight: bold;
}

main {
  max-width: 900px;
  margin: 20px auto;
  background: white;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

footer {
  background: #222;
  color: #aaa;
  text-align: center;
  padding: 10px;
  margin-top: 210px;
}

.tech-list { 
  color: #0f0f0f;
  text-decoration: none;
  list-style: none;/*Retirou os pontos*/
  padding-left: 0;/*ajustou o esquerdo da pagina*/
}
.tech-list li{
  margin-bottom: 10px;
}
.tech-list li:nth-child(1)::before{
  content: "\1F4F1"; /*celular*/
}

.tech-list li:nth-child(2)::before{
  content: "\1F512"; /*Cadeado*/
}

.tech-list li:nth-child(3)::before{
  font-family: "Segoe UI Emoji", "Apple Color Emoji", sans-serif; /*Se algum emoji não aparecer corretamente, garanta a fonte*/
  content: "\2601"; /*Nuvem*/
}

.tech-list li:nth-child(4)::before{
  content: "\1F4F6"; /*Wi-Fi*/
}

.tech-list li:nth-child(5)::before{
  content: "\26A1"; /*Raio*/
}

.container {
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  text-align: center;
}

.btn-post {
  display: inline-block;
  padding: 10px 18px;
  background-color: #00b4d8;
  color: #fff;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

.btn-post:hover {
  background-color: #0077b6;
}

mark{
  background-color: #4b7cc5;
}

.tech-ia{
  max-width: 40%;
  margin: auto;
  display: block;
  /*Borda arrendondada*/
  border:4px solid;
   /*border-image: linear-gradient(45deg, blue, purple, pink) 1;*/
  border-radius:10px;
  animation: corBorda 3s infinite;
}

@keyframes corBorda{
  0%{border-color:red;}
  25%{border-color:blue;}
  50%{border-color:green;}
  75%{border-color:purple;}
  100%{border-color:red;}
}

@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 1.3rem;
  }

  p {
    font-size: 1rem;
  }
}

@media (max-width: 768px) {
  .card {
    padding: 15px;
    border-radius: 12px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
}

form {
  background: #1118273a;
  max-width: 600px;
  margin: 0 auto; /* centraliza */
  padding: 25px;
  border-radius: 12px;
}

form input[type="checkbox"] {
  width: auto;
  margin-right: 8px;
}

input, textarea {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: none;
  margin-top: 5px;
}

button {
  background: #00b4d8;
  color: white;
  padding: 12px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background: #0077b6;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 15px;
}

button {
  margin-top: 15px;
  width: 100%;
  background: #00b4d8;
  color: white;
  padding: 12px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
}