:root {
  --bg: #0b1220;
  --card: #121b2e;
  --text: #e6ecff;
  --muted: #9fb0ff;
  --line: rgba(255,255,255,0.08);
  --btn: #2a3a66;
  --btn2: #3a57c4;
  --danger: #ff6b6b;
  --ok: #4cd964;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 800px at 20% 0%, #14224a 0%, var(--bg) 50%);
  color: var(--text);
}

.container {
  max-width: 980px;
  margin: 32px auto;
  padding: 0 16px;
}

.header h1 { margin: 0 0 8px; font-size: 28px; }
.sub { margin: 0 0 18px; color: var(--muted); }

.card {
  background: rgba(18, 27, 46, 0.9);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.35);
}

.row { display: flex; gap: 12px; align-items: center; }
.controls { margin-bottom: 12px; }

.field { flex: 1; display: flex; flex-direction: column; gap: 6px; }
label { font-size: 13px; color: var(--muted); }

select, textarea, button {
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.15);
  color: var(--text);
  padding: 10px 12px;
  outline: none;
}

textarea { resize: vertical; min-height: 160px; }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; }

.swap {
  width: 56px;
  flex: 0 0 56px;
  cursor: pointer;
  font-size: 18px;
}

.two-col { align-items: stretch; }
.actions { margin-top: 12px; justify-content: flex-start; }
button { cursor: pointer; }
button.primary {
  background: linear-gradient(180deg, var(--btn2), #2a42a6);
  border-color: rgba(255,255,255,0.15);
}
button:disabled { opacity: 0.6; cursor: not-allowed; }

.status {
  margin-left: auto;
  font-size: 13px;
  color: var(--muted);
}
.status[data-kind="error"] { color: var(--danger); }
.status[data-kind="success"] { color: var(--ok); }

.footer { margin-top: 14px; color: var(--muted); }
code { color: #b8c7ff; }
@media (max-width: 860px) {
  .two-col { flex-direction: column; }
  .status { margin-left: 0; }
}