body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: #f4f6f8;
  margin: 0;
}
main {
  max-width: 480px;
  margin: 48px auto;
  background: #fff;
  border-radius: 10px;
  padding: 28px 32px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
h1 { font-size: 20px; margin-top: 0; }
label { display: block; margin: 14px 0 4px; font-weight: 600; }
input {
  width: 100%;
  box-sizing: border-box;
  padding: 8px 10px;
  border: 1px solid #ccd3da;
  border-radius: 6px;
  font-size: 14px;
}
#vr-submit {
  margin-top: 18px;
  padding: 10px 18px;
  border: 0;
  border-radius: 6px;
  background: #2563eb;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}
#vr-submit:disabled { opacity: 0.6; cursor: default; }
#vr-result {
  margin-top: 14px;
  font-size: 12px;
  word-break: break-all;
  color: #334155;
}