:root {
  --cor-bg: #3b2a1a;
  --cor-card: #1c1917; /* puxei pro marrom escuro */
  --cor-primaria: #22c55e;
  --cor-hover: #78350f; /* marrom queimado */
  --cor-texto: #f1f5f9;
  --radius: 18px;
}

/* RESET */
*{
  box-sizing:border-box;
}

/* BODY */
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto;

  background:
    linear-gradient(rgba(0,0,0,.6), rgba(0,0,0,.6)),
    url('https://www.transparenttextures.com/patterns/wood-pattern.png'),
    var(--cor-bg);

  color: var(--cor-texto);
}

/* HEADER */
.header {
  padding: 25px 20px;
  text-align: center;
  font-size: 24px;
  font-weight: bold;
}

/* GRID PRINCIPAL */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  padding: 30px;
  max-width: 1000px;
  margin: auto;
}

/* CARDS */
.card {
  background: var(--cor-card);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: 0.25s;
  text-decoration: none;
  color: white;

  box-shadow: 0 8px 20px rgba(0,0,0,.35);

  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;

  font-size:18px;
  font-weight:600;

  backdrop-filter: blur(4px); /* leve glass */
}

/* HOVER */
.card:hover {
  transform: translateY(-6px) scale(1.03);
  background: var(--cor-hover);
}

/* ÍCONES */
.card i {
  font-size: 42px;
  display: block;
  margin-bottom: 12px;
}

/* FOOTER */
.footer {
  text-align: center;
  padding: 20px;
  opacity: .6;
  font-size: 13px;
}

/* RESPONSIVIDADE */
@media (max-width: 900px) {

  .grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .card {
    padding: 35px 20px;
  }
}

@media (max-width: 520px) {

  .grid {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .card {
    padding: 30px 20px;
    font-size:17px;
  }

  .card i {
    font-size:36px;
  }
}