* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f4f6f8;
  color: #1d2733;
}

main {
  max-width: 560px;
  margin: 48px auto;
  padding: 32px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

h1 { margin-top: 0; font-size: 1.5rem; }
.muted { color: #5b6775; font-size: 0.9rem; }

form { display: grid; gap: 16px; margin: 24px 0; }
label { display: grid; gap: 6px; font-size: 0.9rem; font-weight: 600; }
input, select {
  padding: 10px 12px;
  border: 1px solid #c9d1da;
  border-radius: 8px;
  font: inherit;
  font-weight: 400;
}

button {
  padding: 12px 16px;
  border: 0;
  border-radius: 8px;
  background: #0b5fff;
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { background: #9db6e6; cursor: not-allowed; }

#status { min-height: 1.4em; }
#status.error { color: #b42318; }
#status.ok { color: #067647; }

#iframe-container iframe {
  width: 100%;
  min-height: 260px;
  border: 1px solid #e3e8ee;
  border-radius: 12px;
}
#iframe-container iframe.hidden { display: none; }