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

body {
  font-family: 'Inter', sans-serif;
  background: #101010;
  color: #f4f4f4;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.card {
  background: #1a1a1a;
  padding: 30px 25px;
  border-radius: 15px;
  box-shadow: 0 0 15px rgba(255,215,0,0.1);
  max-width: 400px;
  width: 100%;
  text-align: center;
}

.logo {
  width: 90px;
  margin-bottom: 15px;
  border-radius: 10px;
  border: 2px solid gold;
}

h1 {
  margin-bottom: 20px;
  font-size: 1.4rem;
  color: gold;
}

.cotacoes span {
  display: block;
  margin-bottom: 5px;
  font-size: 0.95rem;
}

.form-conversao {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-direction: column;
}

input[type="text"] {
  padding: 12px;
  border-radius: 8px;
  border: 1px solid #444;
  background: #222;
  color: #fff;
  font-size: 1rem;
}

button {
  background: gold;
  color: #000;
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #ffdd33;
}

.resultado {
  margin-top: 20px;
  font-size: 1.1rem;
}

.error {
  color: #f55;
  font-weight: bold;
  margin-top: 15px;
}

footer {
  margin-top: 25px;
  font-size: 0.85rem;
  color: #888;
}