:root {
  --fundo-escuro: #121212;
  --fundo-claro: #1e1e1e;
  --texto-principal: #f0f0f0;
  --texto-secundario: #cccccc;
  --destaque: #4caf50;
  --erro: #f44336;
  --borda: #333;
  --botao: #2e7d32;
  --botao-hover: #388e3c;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: url('img/fundo.jpg') no-repeat center center fixed;
  background-size: cover;
  color: var(--texto-principal);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 40px 20px;
}

.container {
  background-color: var(--fundo-claro);
  padding: 30px;
  border-radius: 12px;
  width: 100%;
  max-width: 600px;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.6);
  border: 1px solid var(--borda);
}

h1, h2 {
  color: var(--destaque);
  margin-bottom: 20px;
  text-align: center;
}

p, label {
  color: var(--texto-secundario);
  margin-bottom: 10px;
  line-height: 1.5;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 10px;
  margin-bottom: 20px;
  border: none;
  border-radius: 8px;
  background-color: var(--fundo-escuro);
  color: var(--texto-principal);
}

button {
  background-color: var(--botao);
  color: #fff;
  border: none;
  padding: 12px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}

button:hover {
  background-color: var(--botao-hover);
}

#feedback {
  margin-top: 20px;
  font-weight: bold;
  text-align: center;
}

ul {
  list-style: none;
  padding-left: 0;
  margin-top: 15px;
}

ul li {
  margin-bottom: 10px;
  color: var(--texto-principal);
}