/* ============================================================
   Tema de la aplicación (variables CSS + componentes propios).
   El layout usa utilidades Tailwind compiladas (tailwind.css);
   aquí se definen colores, modo oscuro y componentes repetidos.

   Dirección de estilo: "terminal retro-cripto". Una sola voz
   tipográfica monoespaciada (Share Tech Mono) para toda la
   interfaz, como una consola real. Dos variantes, ambas
   retro-computing pero con carácter propio:
     - claro  = pantalla LCD monocroma (verde-oliva sobre gris
                verdoso, matriz de puntos, sin resplandor)
     - oscuro = fósforo CRT verde sobre negro, líneas de barrido
                y resplandor de pantalla
   Nada de esquinas redondeadas, nada de sombras difusas:
   bordes finos, corchetes ASCII y bloques invertidos.
   ============================================================ */

:root {
  --bg: #c7d6b3;
  --bg-card: #d4e0c4;
  --bg-soft: #bccca7;
  --border: #8a9c72;
  --border-strong: #24331a;
  --text: #22301a;
  --text-muted: #52684a;
  --accent: #22301a;
  --accent-soft: #aebd98;
  --accent-text: #1a2814;
  --ok: #2f5e2a;
  --ok-soft: #b9c9a4;
  --err: #6b2a1e;
  --err-soft: #ccb89e;
  --warn: #6b5518;
  --warn-soft: #d8c896;
  --code-bg: #b9c9a2;

  --glow: none;
  --card-shadow: none;
  --scanline: radial-gradient(circle at 1px 1px, rgba(34, 48, 26, .12) 1px, transparent 0);
  --scanline-size: 4px 4px;

  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-sans: var(--font-mono);
  --font-math: 'KaTeX Main', 'Latin Modern Math', 'STIX Two Math', 'Cambria Math', Georgia, serif;
  --radius-xl: 0px;
}

.dark {
  --bg: #090c0a;
  --bg-card: #0e1611;
  --bg-soft: #111c15;
  --border: #274d34;
  --border-strong: #3a9463;
  --text: #33b06a;
  --text-muted: #2b7a4d;
  --accent: #33b06a;
  --accent-soft: #16281c;
  --accent-text: #47c47e;
  --ok: #33b06a;
  --ok-soft: #16281c;
  --err: #d9615f;
  --err-soft: #2a1412;
  --warn: #d1a53f;
  --warn-soft: #292008;
  --code-bg: #0b1410;

  --glow: 0 0 3px rgba(51, 176, 106, .3);
  --card-shadow: 0 0 10px -8px rgba(51, 176, 106, .35);
  --scanline: repeating-linear-gradient(rgba(51, 176, 106, 0) 0px, rgba(51, 176, 106, 0) 2px, rgba(51, 176, 106, .04) 3px);
  --scanline-size: auto;
}

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  background-image: var(--scanline);
  background-size: var(--scanline-size);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  transition: background-color .2s, color .2s;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .02em;
  text-shadow: var(--glow);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0;
  box-shadow: var(--card-shadow);
}

.muted { color: var(--text-muted); }
.accent { color: var(--accent-text); }

/* ---------- botones ---------- */
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
  background: var(--accent); color: var(--bg); font-family: var(--font-mono);
  font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: .8rem;
  padding: .6rem 1.1rem; border-radius: 0; border: 1px solid var(--accent);
  cursor: pointer; transition: filter .1s;
}
.btn-primary::before { content: "[ "; }
.btn-primary::after { content: " ]"; }
.btn-primary:hover { filter: brightness(1.15); }
.btn-primary:active { filter: brightness(.85); }
.btn-primary:disabled { opacity: .4; cursor: wait; }

.btn-ghost {
  display: inline-flex; align-items: center; gap: .3rem;
  background: transparent; color: var(--accent-text); font-family: var(--font-mono);
  border: 1px solid var(--border); border-radius: 0;
  padding: .35rem .7rem; font-size: .76rem; font-weight: 500; text-transform: uppercase;
  letter-spacing: .04em; cursor: pointer; transition: background .1s, border-color .1s;
}
.btn-ghost::before { content: "< "; }
.btn-ghost::after { content: " >"; }
.btn-ghost:hover { background: var(--accent-soft); border-color: var(--accent); }

/* ---------- campos ---------- */
.field {
  width: 100%;
  background: var(--bg-soft); color: var(--text);
  border: 1px solid var(--border); border-radius: 0;
  font-family: var(--font-mono);
  padding: .55rem .8rem; font-size: .88rem;
  outline: none; transition: border-color .1s, box-shadow .1s;
}
.field:focus { border-color: var(--accent); box-shadow: var(--glow); }
textarea.field.mono, .mono { font-family: var(--font-mono); }

label.lbl {
  display: block; font-size: .74rem; font-weight: 600; margin-bottom: .3rem;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: .05em;
  font-family: var(--font-mono);
}
label.lbl::before { content: "// "; }

/* ---------- control segmentado (codificaciones) ---------- */
.seg {
  display: inline-flex; flex-wrap: wrap; gap: 0;
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 0; padding: 2px;
}
.seg button {
  border: none; background: transparent; color: var(--text-muted);
  font-family: var(--font-mono); font-size: .72rem; font-weight: 400;
  text-transform: uppercase; letter-spacing: .03em;
  padding: .3rem .65rem; border-radius: 0; cursor: pointer;
  transition: background .1s, color .1s;
}
.seg button.active { background: var(--accent); color: var(--bg); }

/* ---------- cajas de salida ---------- */
.mono-box {
  font-family: var(--font-mono);
  font-size: .78rem; line-height: 1.55;
  background: var(--code-bg); border: 1px solid var(--border); border-left: 3px solid var(--border-strong);
  border-radius: 0; padding: .7rem .85rem;
  max-height: 11rem; overflow: auto;
  word-break: break-all; white-space: pre-wrap;
  color: var(--text-muted);
}
.mono-box:empty::before { content: "—"; color: var(--text-muted); }

.badge {
  display: inline-flex; align-items: center; gap: 0;
  font-family: var(--font-mono); font-size: .7rem; font-weight: 700;
  letter-spacing: .04em; text-transform: uppercase;
}
.badge::before { content: "["; }
.badge::after { content: "]"; }
.badge-accent { color: var(--accent-text); }
.badge-ok { color: var(--ok); }
.badge-err { color: var(--err); }
.badge-warn { color: var(--warn); }

.result-ok { border-color: var(--ok) !important; background: var(--ok-soft); }
.result-err { border-color: var(--err) !important; background: var(--err-soft); }

/* ---------- pestañas de navegación ---------- */
.nav-tab {
  white-space: nowrap; font-family: var(--font-mono); font-size: .78rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: .03em;
  color: var(--text-muted); padding: .5rem .6rem; border-radius: 0;
  border: none; background: transparent; cursor: pointer;
  transition: color .1s;
}
.nav-tab:hover { color: var(--accent-text); }
.nav-tab.active { color: var(--accent-text); font-weight: 700; text-shadow: var(--glow); }
.nav-tab.active::before { content: ">"; margin-right: .3em; animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- detalles/expandibles ---------- */
details.exp { border: 1px solid var(--border); border-radius: 0; background: var(--bg-soft); }
details.exp > summary {
  cursor: pointer; padding: .55rem .85rem; font-size: .8rem; font-weight: 600;
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .03em;
  color: var(--accent-text); list-style: none; display: flex; align-items: center; gap: .4rem;
}
details.exp > summary::before { content: "▸"; transition: transform .15s; }
details.exp[open] > summary::before { transform: rotate(90deg); }
details.exp > div { padding: 0 .85rem .7rem; }

/* fórmulas — la única voz serif de la interfaz: se leen como una
   ecuación tipografiada con LaTeX en medio de la salida de consola */
.math { font-family: var(--font-math); font-style: italic; }
.formula {
  display: block; text-align: center; padding: .6rem .5rem; margin: .6rem 0;
  background: var(--bg-soft); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 0;
  font-family: var(--font-math); font-style: italic;
  font-size: 1.1rem; color: var(--accent-text); text-shadow: var(--glow);
  overflow-x: auto;
}

/* pasos numerados de las explicaciones, estilo salida de consola */
.steps { counter-reset: paso; }
.steps li { counter-increment: paso; position: relative; padding-left: 2.4rem; margin-bottom: .6rem; font-size: .87rem; }
.steps li::before {
  content: "[" counter(paso) "]";
  position: absolute; left: 0; top: 0;
  font-family: var(--font-mono); color: var(--accent-text); font-size: .85rem; font-weight: 700;
}

/* tablas */
.tbl { width: 100%; border-collapse: collapse; font-size: .82rem; font-family: var(--font-mono); border-top: 2px solid var(--border-strong); border-bottom: 2px solid var(--border-strong); }
.tbl th {
  text-align: left; color: var(--text-muted); font-weight: 700; text-transform: uppercase; letter-spacing: .03em;
  padding: .4rem .6rem; border-bottom: 1px solid var(--border-strong);
}
.tbl td { padding: .4rem .6rem; border-bottom: 1px solid var(--border); }
.tbl tr:last-child td { border-bottom: none; }

/* spinner */
.spinner {
  width: 1rem; height: 1rem; border-radius: 999px;
  border: 2px solid var(--bg); border-top-color: transparent;
  animation: spin .7s linear infinite; display: none;
}
.btn-primary.loading .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* scrollbars discretos */
.mono-box::-webkit-scrollbar { width: 8px; height: 8px; }
.mono-box::-webkit-scrollbar-thumb { background: var(--border); border-radius: 0; }

/* ---------- valores en cascada dentro de la tarjeta unificada ---------- */
.step-out {
  margin-top: .6rem;
  border-left: 3px solid var(--accent);
  padding-left: .75rem;
}
.step-out .lbl { margin-top: .5rem; }
.step-out .lbl:first-child { margin-top: 0; }
.reveal { animation: fadeUp .4s both; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}
.steps > li { margin-bottom: 1rem; }

/* ---------- visor del árbol FALCON (LDL*) ---------- */
.tree-node {
  margin: .35rem 0;
  border: 1px solid var(--border);
  border-radius: 0;
  background: var(--bg-card);
}
.tree-node > summary {
  cursor: pointer; list-style: none;
  padding: .4rem .7rem;
  font-family: var(--font-mono); font-size: .78rem; font-weight: 600; text-transform: uppercase; letter-spacing: .02em;
  color: var(--accent-text);
  display: flex; align-items: center; gap: .4rem;
}
.tree-node > summary::before { content: "▸"; transition: transform .15s; }
.tree-node[open] > summary::before { transform: rotate(90deg); }
.tree-children {
  margin-left: .9rem; padding: .1rem .6rem .5rem .8rem;
  border-left: 2px solid var(--accent);
}
.tree-leaf {
  margin: .35rem 0; padding: .4rem .7rem;
  border: 1px solid var(--border); border-radius: 0;
  background: var(--ok-soft); color: var(--ok);
  font-family: var(--font-mono); font-size: .78rem; font-weight: 600;
}
.tree-node .mono-box { max-height: 7rem; font-size: .72rem; margin: .3rem 0 .45rem; }

/* texto de la portada (clase usada en index.html) — sin justificar: en
   monoespaciada el justificado abre ríos de espacio en blanco ilegibles */
.justified-text {
  text-align: left;
  font-size: .92rem;
  line-height: 1.65;
  margin-bottom: .8rem;
}