.re-card {
  max-width: 560px;
  margin: 30px auto;
  padding: 25px;
  background: linear-gradient(135deg,#eef2ff,#ffffff);
  border-radius: 18px;
  box-shadow: 0 15px 35px rgba(0,0,0,.1);
  font-family: system-ui;
}

.re-card h1 {
  text-align: center;
}

.re-card label {
  display: block;
  margin-top: 12px;
  font-weight: 600;
}

.re-card input {
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #ccc;
  margin-top: 5px;
}

.re-card hr {
  margin: 18px 0;
  border: none;
  border-top: 1px solid #ddd;
}

.re-card button {
  width: 100%;
  margin-top: 18px;
  padding: 14px;
  border: none;
  border-radius: 14px;
  background: #2563eb;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}

.re-card button:hover {
  background: #1e40af;
}

#result {
  margin-top: 20px;
  background: #f8fafc;
  padding: 15px;
  border-radius: 14px;
}

.note {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  text-align: center;
  color: #555;
}

@media (max-width: 480px) {
  .re-card {
    margin: 15px;
    padding: 18px;
  }
}