:root {
  --bg: #0f1419;
  --fg: #e7ecf1;
  --accent: #3d8bfd;
  --muted: #8b9aab;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  background: radial-gradient(1200px 600px at 20% -10%, #1a2740, var(--bg));
  color: var(--fg);
  min-height: 100vh;
}
.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}
h1 { font-size: 1.6rem; margin: 0 0 0.25rem; }
.sub { color: var(--muted); margin: 0 0 1.5rem; }
label { display: block; margin: 0.75rem 0; }
input {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px solid #2a3545;
  background: #121a24;
  color: var(--fg);
}
.row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 1rem 0; }
button {
  border: 0;
  border-radius: 999px;
  padding: 0.7rem 1.1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { opacity: 0.45; cursor: not-allowed; }
#log {
  margin-top: 1.25rem;
  padding: 1rem;
  background: #0b1016;
  border-radius: 12px;
  min-height: 180px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.85rem;
  color: #c5d0db;
}