html, body {
  height: 100%;
}
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: #0b0f17;
  color: #e7edf6;
  display: grid;
  place-items: center;
}
.card {
  width: min(680px, calc(100% - 24px));
  background: #121a29;
  border: 1px solid #22304a;
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 18px 50px rgba(0,0,0,0.35);
}
h1 {
  margin: 0 0 8px 0;
  font-size: 20px;
}
.sub {
  margin: 0 0 14px 0;
  opacity: 0.85;
}
.row {
  display: flex;
  gap: 10px;
  align-items: center;
  margin: 10px 0;
}
input {
  flex: 1;
  min-width: 150px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #2a3a57;
  background: #0e1523;
  color: #e7edf6;
  outline: none;
}
button {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #2a3a57;
  background: #18233a;
  color: #e7edf6;
  cursor: pointer;
}
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.status {
  font-size: 13px;
  opacity: 0.85;
}
details {
  margin-top: 12px;
  opacity: 0.9;
}
code {
  background: #0e1523;
  border: 1px solid #2a3a57;
  padding: 1px 6px;
  border-radius: 8px;
}