:root {
  color-scheme: dark light;
  --bg: #0f1115;
  --fg: #e6e6e6;
  --muted: #9aa0a6;
  --accent: #62d2ff;
  --panel: #181b22;
  --border: #2a2f3a;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 760px; margin: 6vh auto; padding: 0 24px; }
h1 { font-size: 1.6rem; margin: 0 0 .25rem; }
.sub { color: var(--muted); margin: 0 0 2rem; }
form { display: flex; flex-direction: column; gap: 12px;
  background: var(--panel); padding: 20px; border: 1px solid var(--border); border-radius: 12px; }
label { font-size: .85rem; color: var(--muted); display: block; }
input, select, button { font: inherit; }
input, select {
  background: #0b0d12; color: var(--fg);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 12px; width: 100%;
}
input:focus, select:focus { outline: none; border-color: var(--accent); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; }
button {
  margin-top: 6px;
  background: var(--accent); color: #00131c; border: 0;
  padding: 12px 16px; border-radius: 8px; font-weight: 600; cursor: pointer;
}
button:disabled { opacity: .6; cursor: progress; }
.status { min-height: 1.2em; margin-top: 1rem; color: var(--muted); }
.status.err { color: #ff6b6b; }
.status.ok { color: #8fdc8f; }
.preview { background: #000; color: #fff; padding: 12px; min-height: 4em;
  border: 1px solid var(--border); border-radius: 8px; overflow: auto;
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 10px; line-height: 1.0; }
details { margin-top: 2rem; color: var(--muted); }
summary { cursor: pointer; }
pre { background: #0b0d12; border: 1px solid var(--border); border-radius: 8px;
  padding: 12px; overflow-x: auto; font-size: .85rem; color: var(--fg); }