/* =====================================================================
   style.css — Guía interactiva FI-UNMdP
   Dirección visual: papel técnico cuadriculado. La guía es un grafo
   dirigido, así que la navegación se dibuja como tal: nodos, aristas y
   etiquetas monoespaciadas.
   ===================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700&family=Atkinson+Hyperlegible:wght@400;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* ---------- Tokens ---------- */
:root {
  --paper:        #E7EBEF;
  --grid:         #D3DBE3;
  --grid-strong:  #C3CDD8;
  --surface:      #FFFFFF;
  --surface-2:    #F3F6F8;
  --ink:          #0F1B24;
  --ink-2:        #4A5A6B;
  --ink-3:        #7F8FA0;
  --line:         #CBD5DF;

  --teal:         #0E6E62;
  --teal-dark:    #0A554B;
  --teal-tint:    #E1EFEC;
  --plum:         #8E2A5A;
  --plum-tint:    #F8E8EF;
  --danger:       #A32424;

  --font-display: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --font-body:    'Atkinson Hyperlegible', system-ui, -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --radius:   4px;
  --radius-lg: 6px;
  --shadow:  0 1px 2px rgba(15, 27, 36, .06), 0 12px 32px -12px rgba(15, 27, 36, .22);
  --ring:    0 0 0 3px rgba(14, 110, 98, .30);

  --step: 200ms;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:       #101922;
    --grid:        #18242F;
    --grid-strong: #1E2C39;
    --surface:     #16212B;
    --surface-2:   #1C2833;
    --ink:         #E9EFF4;
    --ink-2:       #A2B2C0;
    --ink-3:       #78899A;
    --line:        #2A3946;

    --teal:        #4FC0AE;
    --teal-dark:   #7FD6C7;
    --teal-tint:   #143029;
    --plum:        #E88FB4;
    --plum-tint:   #2E1A24;
    --danger:      #E88A8A;

    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 16px 40px -16px rgba(0, 0, 0, .7);
    --ring:   0 0 0 3px rgba(79, 192, 174, .35);
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

/* Los contenedores con display:flex o :grid ganan al display:none implícito
   de [hidden]; sin esto, los campos ocultos del editor siguen visibles. */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  padding: clamp(1rem, 4vw, 3rem) 1rem clamp(2rem, 6vw, 4rem);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--paper);
  /* Cuadrícula de papel milimetrado: 8 mm fina, 40 mm gruesa */
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    linear-gradient(var(--grid-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-strong) 1px, transparent 1px);
  background-size: 24px 24px, 24px 24px, 120px 120px, 120px 120px;
  background-position: -1px -1px;
}

.shell { max-width: 46rem; margin: 0 auto; }

/* ---------- Encabezado ---------- */
.masthead { margin-bottom: 1.5rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: .7rem;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 .5rem;
}

.masthead h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 6vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -.025em;
  margin: 0;
  color: var(--ink);
}

.masthead h1 em {
  font-style: normal;
  color: var(--teal);
}

.masthead p {
  margin: .6rem 0 0;
  max-width: 34rem;
  color: var(--ink-2);
  font-size: .95rem;
}

/* ---------- Ruta (firma visual): el grafo recorrido ---------- */
.trail {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  margin-bottom: .75rem;
  min-height: 1.75rem;
}

.trail:empty { display: none; }

.trail-node {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  max-width: min(18rem, 60vw);
  padding: .2rem .55rem .2rem .35rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .04em;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--step), border-color var(--step), background var(--step);
}

.trail-node > span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.trail-node::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-3);
  transition: background var(--step);
}

.trail-node:hover,
.trail-node:focus-visible {
  color: var(--teal);
  border-color: var(--teal);
}

.trail-node:hover::before,
.trail-node:focus-visible::before { background: var(--teal); }

.trail-node[aria-current="step"] {
  cursor: default;
  color: var(--ink);
  border-color: var(--ink);
  background: var(--surface);
}

.trail-node[aria-current="step"]::before { background: var(--teal); }

/* La arista entre nodos */
.trail-edge {
  width: 1.1rem;
  height: 1px;
  background: var(--line);
  flex: none;
}

/* ---------- Tarjeta ---------- */
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 4vw, 2.25rem);
}

.card:focus { outline: none; }

/* Marca de esquina: escuadra de plano técnico */
.card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 22px;
  height: 22px;
  border-top: 2px solid var(--teal);
  border-left: 2px solid var(--teal);
  border-top-left-radius: var(--radius-lg);
}

/* ---------- Nodo pregunta ---------- */
.node-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 .5rem;
}

.question-text {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.2rem, 3.6vw, 1.55rem);
  line-height: 1.25;
  letter-spacing: -.012em;
  margin: 0;
  color: var(--ink);
}

.options {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  margin: 1.4rem 0 0;
}

/* ---------- Nodo resultado ---------- */
.result-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.2rem, 3.6vw, 1.6rem);
  line-height: 1.2;
  letter-spacing: -.015em;
  margin: 0 0 .9rem;
  color: var(--ink);
}

.result-body {
  border-left: 2px solid var(--plum);
  padding-left: 1rem;
  margin: 0;
}

.result-body p { margin: 0 0 .85rem; }
.result-body p:last-child { margin-bottom: 0; }

/* Líneas que empiezan con viñeta o número: sangría francesa y menos aire */
.result-body p.item {
  margin-bottom: .35rem;
  padding-left: 1.1rem;
  text-indent: -1.1rem;
}

.result-body p.item + p:not(.item) { margin-top: .85rem; }

.result-body a {
  color: var(--teal);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  overflow-wrap: anywhere;
}

.result-body a:hover { color: var(--teal-dark); }

.source {
  display: block;
  margin-top: 1.25rem;
  padding-top: .75rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.5;
  color: var(--ink-3);
}

.source::before { content: "Fuente · "; }

/* ---------- Botones ---------- */
.btn {
  font: inherit;
  font-size: .95rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: .7rem .9rem;
  cursor: pointer;
  text-align: left;
  transition: background var(--step), border-color var(--step),
              color var(--step), transform 80ms;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

.btn:active { transform: translateY(1px); }

.btn:disabled {
  opacity: .4;
  cursor: not-allowed;
  transform: none;
}

/* Opción: fila con flecha, no bloque de color */
.btn-option {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  background: var(--surface-2);
  border-color: var(--line);
  color: var(--ink);
  line-height: 1.4;
}

.btn-option::before {
  content: "→";
  font-family: var(--font-mono);
  color: var(--teal);
  flex: none;
  transition: transform var(--step);
}

.btn-option:hover {
  background: var(--teal-tint);
  border-color: var(--teal);
}

.btn-option:hover::before { transform: translateX(2px); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.5rem;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink-2);
  text-align: center;
}

.btn-ghost:hover {
  border-color: var(--ink-2);
  color: var(--ink);
}

.btn-solid {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
  text-align: center;
}

.btn-solid:hover { background: var(--teal-dark); border-color: var(--teal-dark); }

@media (prefers-color-scheme: dark) {
  .btn-solid { color: #06211D; }
}

/* ---------- Estado de error ---------- */
.error-state .node-label { color: var(--danger); }

.error-state p {
  margin: .25rem 0 0;
  color: var(--ink-2);
}

/* ---------- Pie ---------- */
.colophon {
  margin-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.7;
  color: var(--ink-3);
}

.colophon a { color: var(--ink-2); }
.colophon a:hover { color: var(--teal); }

/* ---------- Entrada escalonada ---------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

.animate-in { animation: rise 260ms cubic-bezier(.2, .7, .3, 1) both; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}