:root {
  --bg: antiquewhite;
  --accent: rgb(176, 4, 4);
  --accent-dark: rgb(120, 3, 3);
  --card: #fff3d9;
  --muted: #000000aa;
  --max-w: 1000px;
}

html, body {
  margin: 0;
  background: var(--bg);
  font-family: "Courier New", monospace;
}

/* header */
.site-header {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 1fr 2fr 1fr;
  height: 150px;
  width: 100%;
  background-color: var(--accent);
  text-align: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.12);
}

.site-header h1 {
  grid-row: 2;
  grid-column: 1/-1;
  margin: 0;
  font-family: "Archivo Black", sans-serif;
  color: white;
  font-size: 2rem;
}

nav {
  grid-row: 3;
  grid-column: 1/-1;
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 34px;
  background: antiquewhite;
  border-bottom: 2px solid var(--accent);
}

nav a {
  text-decoration: none;
}

nav a p {
  font-family: "Archivo Black", sans-serif;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

/* conteudo */

.conteudo {
  max-width: var(--max-w);
  margin: 26px auto;
  padding: 0 18px 48px 18px;
}

.card {
  background: var(--card);
  border-radius: 12px;
  padding: 22px;
  border: 2px solid rgba(0,0,0,0.12);
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}

h2 {
  font-family: "Archivo Black", sans-serif;
  margin-top: 0;
  color: var(--accent);
}

.lead {
  margin-top: 6px;
  color: #333;
}

label {
  font-weight: 700;
  color: #111;
  margin-top: 12px;
  display: block;
}

input,
textarea {
  width: 100%;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #666;
  margin-top: 4px;
  font-family: inherit;
  font-size: 1rem;
  box-sizing: border-box;
}

textarea {
  min-height: 110px;
  resize: vertical;
}

.caixa-botao {
  display: flex;
  justify-content: center;
}

#btnEnviar {
  font-family: "Archivo Black", sans-serif;
  margin-top: 20px;
  width: 60%;
  height: 48px;
  background: var(--accent);
  color: white;
  border: 2px solid black;
  border-radius: 10px;
  cursor: pointer;
}

#btnEnviar:hover {
  background: var(--accent-dark);
}

.erro {
  color: red;
  min-height: 18px;
  font-size: 0.9rem;
}

.sucesso {
  margin-top: 14px;
  font-weight: bold;
  color: green;
  text-align: center;
}

.rodape {
  margin-top: 20px;
  text-align: center;
  color: #333;
  padding: 12px 0;
}

/* responsividade */
@media (max-width: 600px) {
  #btnEnviar {
    width: 100%;
  }
}