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

body {
  font-family: Arial, Helvetica, sans-serif;
  background: url("img/fundo12.png") no-repeat center center fixed;
  background-size: cover;
  color: white;
  line-height: 1.6;
}

:root {
    --primaria: #4f46e5;
    --secundaria: #7c3aed;
    --escuro: #0f172a;
    --maisescuro: #0a0f1c;
    --claro: #e2e8f0;
    --vidro: rgba(255, 255, 255, 0.1);
    --preto: #000000;
}

/* Navbar */
.navegacao {
    width: 100%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    position: fixed;
    z-index: 100;
    padding: 0.70rem;
    position: relative;
}

.menu {
    list-style: none;
    display: flex;
    gap: 30px;
    padding: 7px 0;
}

.menu-link {
    text-decoration: none;
    color: var(--claro);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

.menu-link::after{
    content: '';
    height: 2px;
    width: 0%;
    position: absolute;
    bottom: 0%;
    left: 0%;
    background: linear-gradient(90deg, var(--primaria), var(--secundaria));
    transition: width 0.5s ease;
}

.menu-link:hover::after {
    width: 100%;
}

.introducao-materiais {
    text-align: center;
    font-size: 28px;
    margin: 40px 0 20px;
    color: #fff;
    text-shadow: 0 0 8px rgba(0, 140, 255, 0.8);
}

/* ======= Conteúdo ======= */
.containe {
  max-width: 1100px;
  margin: 60px auto;
  text-align: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.6);
  border-radius: 12px;
}

h2 {
  color: #add8e6; /* azul claro igual ao feedback */
  margin-bottom: 20px;
  margin-top: 50px;
}

.mt {
  color: #fff;

}

p {
  margin-bottom: 30px;
}

/* ======= Cards de Materiais ======= */
.materiais-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.card {
  background: #111;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  transition: transform 0.3s ease-in-out;
}

.card:hover {
  transform: scale(1.05);
}

.card h3 {
  margin-bottom: 10px;
  color: #ffffff; /* título dourado */
}

.card p {
  font-size: 0.9rem;
  color: #ddd;
}

.botao-material {
    padding: 5px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(90deg, #007bff);
    color: white;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
    width: 200px;
    height: 50px;
}