* {
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eef4ff, #dfe8ff);
  padding: 20px;
}

.container {
  width: 100%;
  max-width: 500px;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 18px 35px rgba(0, 0, 0, 0.12);
  padding: 25px;
}

.logo {
  display: block;
  width: 180px;
  height: auto;
  margin: 0 auto 20px;
  object-fit: contain;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #1f2937;
  font-size: 2rem;
}

.campo {
  margin-bottom: 18px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: bold;
  color: #374151;
}

input {
  width: 100%;
  height: 48px;
  padding: 0 12px;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  font-size: 1rem;
  outline: none;
}

input:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
}

button {
  width: 100%;
  height: 50px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, #2563eb, #10b981);
  color: white;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s ease;
}

button:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

.resultado {
  margin-top: 22px;
  background: #f3f4f6;
  border-left: 6px solid #2563eb;
  border-radius: 10px;
  padding: 16px 18px;
}

.resultado h2 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: #111827;
}

.valor {
  font-size: 2rem;
  font-weight: bold;
  color: #111827;
  margin: 0 0 6px;
}

.mensagem {
  margin: 0;
  color: #374151;
  font-size: 1rem;
}

.footer {
  margin-top: 18px;
  text-align: center;
  color: #1f2937;
  font-weight: bold;
  font-size: 0.95rem;
}

@media (max-width: 500px) {
  .container {
    padding: 20px;
  }

  h1 {
    font-size: 1.6rem;
  }
}