:root {
  --fondo: #0d0f12; --panel: #161a20; --borde: #2a313c;
  --texto: #e8e6e3; --ambar: #ffb000; --verde: #39d353;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  background: var(--fondo); color: var(--texto);
  font-family: "Courier New", ui-monospace, monospace;
}
main { width: min(680px, 92vw); padding: 2rem 0; }
h1 {
  font-size: clamp(2rem, 6vw, 3.2rem); letter-spacing: .08em; margin: 0;
  color: var(--ambar); text-shadow: 0 0 18px rgba(255, 176, 0, .35);
}
h1 span { font-size: .45em; vertical-align: super; color: var(--verde); }
.sub { color: #8b949e; margin: .4rem 0 2rem; font-size: .9rem; }
.panel { background: var(--panel); border: 1px solid var(--borde); border-radius: 12px; padding: 1.5rem; }
.niveles {
  border: 1px dashed var(--borde); border-radius: 8px; padding: .8rem 1rem;
  display: flex; gap: 1rem; flex-wrap: wrap;
}
.niveles legend { padding: 0 .4rem; color: var(--verde); }
.niveles label { display: flex; gap: .4rem; align-items: center; cursor: pointer; font-size: .9rem; }
.niveles input { accent-color: var(--ambar); }
#generar {
  width: 100%; margin: 1.2rem 0; padding: 1rem; font: inherit; font-weight: bold;
  letter-spacing: .12em; color: #14100a; background: var(--ambar); border: 0;
  border-radius: 8px; cursor: pointer; box-shadow: 0 4px 24px rgba(255, 176, 0, .25);
}
#generar:hover { filter: brightness(1.08); }
#generar:disabled { opacity: .6; cursor: wait; }
.salida {
  min-height: 5.5rem; padding: 1rem; border-radius: 8px; background: #0a0c0f;
  border: 1px solid var(--borde); line-height: 1.6; white-space: pre-wrap;
}
.acciones { display: flex; gap: 1rem; align-items: center; margin-top: .8rem; flex-wrap: wrap; }
#copiar {
  font: inherit; background: transparent; color: var(--verde);
  border: 1px solid var(--verde); border-radius: 6px; padding: .4rem .8rem; cursor: pointer;
}
#contador { color: #8b949e; font-size: .85rem; }
.aviso { color: var(--ambar); font-size: .85rem; }
footer { margin-top: 1.5rem; color: #666; font-size: .8rem; text-align: center; }
footer a { color: var(--verde); }