:root {
  --azul: #2563eb;
  --cinza: #6b7280;
  --borda: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: #f3f4f6;
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  color: #111827;
}

.card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  padding: 32px;
  width: 100%;
  max-width: 460px;
}

h1 {
  margin-top: 0;
}

input {
  width: 100%;
  padding: 12px;
  margin: 6px 0;
  border: 1px solid var(--borda);
  border-radius: 8px;
  font-size: 15px;
}

.row {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.btn {
  display: inline-block;
  background: var(--azul);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 15px;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}

.btn:hover {
  opacity: 0.92;
}

.btn:disabled {
  opacity: 0.6;
  cursor: default;
}

.btn-secundario {
  background: #fff;
  color: var(--azul);
  border: 1px solid var(--azul);
}

.btn-grande {
  width: 100%;
  font-size: 16px;
  padding: 14px;
  margin-top: 8px;
}

.produto {
  border: 1px solid var(--borda);
  border-radius: 12px;
  padding: 20px;
  margin: 16px 0;
  text-align: center;
}

.preco {
  font-size: 28px;
  font-weight: 700;
  color: var(--azul);
  margin: 4px 0;
}

.muted {
  color: var(--cinza);
  font-size: 14px;
}

.erro {
  color: #dc2626;
  font-size: 14px;
  min-height: 1em;
}

.conteudo ul {
  line-height: 1.9;
}

.aguardando {
  text-align: center;
  padding: 16px;
}

.spinner {
  width: 32px;
  height: 32px;
  margin: 0 auto 12px;
  border: 4px solid var(--borda);
  border-top-color: var(--azul);
  border-radius: 50%;
  animation: girar 0.9s linear infinite;
}

@keyframes girar {
  to {
    transform: rotate(360deg);
  }
}