/* ============================================================
   Anatomía de una predicción — hoja de estilos única
   Tema: papel claro, tipográfico, un solo acento.
   ============================================================ */

:root {
  --bg: #FAF9F5;
  --ink: #1F1E1C;
  --muted: #6E6A63;
  --hairline: #E5E1D8;
  --accent: #C2552C;
  --accent-soft: rgba(194, 85, 44, 0.12);
  --blue: #4A6FA5;
  --card: #FFFFFF;
  --serif: "Iowan Old Style", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

button { font: inherit; color: inherit; cursor: pointer; }

/* ─── Rail de progreso ─── */

.rail {
  position: fixed;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 18px;
  z-index: 40;
}

.rail__dot {
  position: relative;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1.5px solid var(--muted);
  background: transparent;
  padding: 0;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}

.rail__dot:hover { transform: scale(1.3); }

.rail__dot.is-active {
  background: var(--accent);
  border-color: var(--accent);
}

.rail__label {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.rail__dot:hover .rail__label,
.rail__dot.is-active .rail__label { opacity: 1; }

.rail__dot.is-active .rail__label { color: var(--accent); }

/* ─── Barra de contexto sticky ─── */

.context-bar[hidden] { display: none; }

.context-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 24px 10px 72px;
  background: rgba(250, 249, 245, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--hairline);
}

.context-bar__text {
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  direction: rtl; /* si el texto no cabe, mostrar el final (lo más reciente) */
  text-align: left;
}

.context-bar__text bdi { direction: ltr; unicode-bidi: isolate; }

.context-bar__text .gen { color: var(--accent); font-weight: 600; }

.context-bar__meta {
  display: flex;
  gap: 14px;
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
}

/* ─── Secciones ─── */

main { scroll-snap-type: y proximity; }

.stage {
  min-height: 100svh;
  display: flex;
  align-items: center;
  scroll-snap-align: start;
  padding: 6rem 24px 6rem 72px;
}

.stage__inner {
  display: grid;
  grid-template-columns: minmax(32ch, 4fr) 6fr;
  gap: 4rem;
  max-width: 1080px;
  margin: 0 auto;
  width: 100%;
  align-items: start;
}

/* ─── Prosa ─── */

.stage__prose .kicker {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.6rem;
  font-weight: 600;
}

.stage__prose h2 {
  font-family: var(--serif);
  font-size: 2.4rem;
  line-height: 1.12;
  font-weight: 500;
  margin: 0 0 1.2rem;
}

.stage__prose p { margin: 0 0 1rem; color: var(--ink); }
.stage__prose p strong { font-weight: 650; }

.formula {
  font-family: var(--mono);
  font-size: 14px;
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 10px 14px;
  margin: 1rem 0;
  white-space: pre-wrap;
  color: var(--ink);
}

details.deeper {
  margin: 1.2rem 0;
  border-top: 1px solid var(--hairline);
  padding-top: 0.8rem;
}

details.deeper summary {
  cursor: pointer;
  font-size: 14px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  list-style: none;
  user-select: none;
}

details.deeper summary::before { content: "+ "; color: var(--accent); }
details.deeper[open] summary::before { content: "− "; }
details.deeper summary::-webkit-details-marker { display: none; }
details.deeper > *:not(summary) { font-size: 15.5px; color: var(--muted); }
details.deeper p { margin: 0.8rem 0; }

.tryit {
  border-left: 2px solid var(--accent);
  padding: 2px 0 2px 14px;
  font-size: 15px;
  font-style: italic;
  color: var(--muted);
  margin: 1.2rem 0 0;
}

.tryit::before {
  content: "Pruébalo: ";
  font-style: normal;
  font-weight: 650;
  color: var(--accent);
}

/* ─── Hero ─── */

.stage--hero { padding-left: 24px; }

.hero {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.hero__kicker {
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.hero__title {
  font-family: var(--serif);
  font-size: clamp(2.6rem, 6vw, 3.6rem);
  font-weight: 500;
  line-height: 1.08;
  margin: 0 0 1.4rem;
}

.hero__lead {
  font-size: 18px;
  color: var(--muted);
  margin: 0 0 2.2rem;
}

.hero__form {
  display: flex;
  gap: 10px;
  margin-bottom: 0.8rem;
}

.hero__input {
  flex: 1;
  font-size: 16px;
  padding: 12px 16px;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  background: var(--card);
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s;
}

.hero__input:focus { border-color: var(--accent); }

.hero__hint {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 1.6rem;
}

.hero__examples {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2.4rem;
}

.hero__note { font-size: 13px; color: var(--muted); }

/* ─── Botones y chips ─── */

.btn {
  border: 1px solid var(--hairline);
  background: var(--card);
  border-radius: 6px;
  padding: 12px 22px;
  font-size: 15px;
  transition: border-color 0.2s, background 0.2s, transform 0.1s;
}

.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.btn--primary:hover { background: #a8451f; }
.btn:disabled { opacity: 0.5; cursor: default; }

.chip {
  font-family: var(--mono);
  font-size: 13px;
  padding: 6px 12px;
  border: 1px solid var(--hairline);
  border-radius: 99px;
  background: transparent;
  color: var(--muted);
  transition: border-color 0.2s, color 0.2s;
}

.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip.is-active { border-color: var(--accent); color: var(--accent); }

/* ─── Captions de widget ─── */

.widget-caption {
  font-size: 13.5px;
  color: var(--muted);
  font-family: var(--mono);
  min-height: 1.6em;
  margin: 0.8rem 0 0;
}

.badge {
  display: inline-block;
  font-size: 11px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 99px;
  border: 1px solid var(--hairline);
  color: var(--muted);
}

.badge--real { border-color: rgba(74, 111, 165, 0.5); color: var(--blue); }

/* ─── §1 Tokens ─── */

.token-flow {
  font-family: var(--mono);
  font-size: 22px;
  line-height: 2.1;
  word-break: break-word;
}

.token-piece {
  border-bottom: 2px solid transparent;
  border-radius: 3px 3px 0 0;
  padding: 3px 1px;
  cursor: default;
  white-space: pre-wrap;
  transition: filter 0.15s;
}

.token-piece:hover { filter: brightness(0.92) saturate(2); }

.token-ids {
  margin-top: 1.2rem;
  font-size: 15px;
  color: var(--muted);
  line-height: 2;
}

.token-ids .tid {
  padding: 1px 6px;
  border-radius: 3px;
  margin-right: 4px;
  display: inline-block;
}

.token-arrow {
  display: block;
  color: var(--muted);
  font-size: 14px;
  margin: 0.6rem 0 0;
}

.token-play {
  margin-top: 2.4rem;
  border-top: 1px solid var(--hairline);
  padding-top: 1.4rem;
}

.token-play label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

.token-play input {
  width: 100%;
  font-family: var(--mono);
  font-size: 15px;
  padding: 9px 12px;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  background: var(--card);
  outline: none;
}

.token-play input:focus { border-color: var(--accent); }

.token-play__out {
  margin-top: 10px;
  font-size: 15px;
  line-height: 2.1;
  min-height: 2.2em;
}

/* ─── §2 Embeddings ─── */

.emb-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 1.2rem; }

.emb-svg-wrap {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 14px;
}

.emb-svg-wrap svg { display: block; width: 100%; height: auto; }

.emb-bar { transition: height 0.25s, y 0.25s; }
.emb-bar:hover { opacity: 0.7; }

.emb-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
  font-size: 13px;
  color: var(--muted);
  font-family: var(--mono);
}

.sim-section { margin-top: 2.2rem; }

.sim-title {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.8rem;
}

.sim-grid {
  display: grid;
  gap: 2px;
  font-family: var(--mono);
  font-size: 11px;
}

.sim-cell {
  aspect-ratio: 1;
  border-radius: 2px;
  cursor: default;
  transition: outline 0.1s;
}

.sim-cell:hover { outline: 2px solid var(--ink); outline-offset: -1px; }

.sim-label {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 6px;
  color: var(--muted);
  overflow: hidden;
  white-space: pre;
}

.sim-label--col {
  writing-mode: vertical-rl;
  justify-content: flex-start;
  padding: 4px 0 0;
}

/* ─── §3 Atención ─── */

.attn-strip {
  font-family: var(--mono);
  font-size: 20px;
  line-height: 2.4;
  word-break: break-word;
}

.attn-token {
  position: relative;
  padding: 4px 2px;
  border-radius: 3px;
  cursor: pointer;
  white-space: pre-wrap;
  border-bottom: 2px solid transparent;
  transition: background 0.25s;
}

.attn-token.is-query {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-radius: 3px;
  cursor: default;
}

.attn-token .attn-pct {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  top: 100%;
  font-size: 11px;
  color: var(--blue);
  font-weight: 600;
  line-height: 1.4;
}

.attn-sentence {
  margin-top: 2.2rem;
  font-size: 16px;
  color: var(--ink);
  border-top: 1px solid var(--hairline);
  padding-top: 1.2rem;
}

.attn-sentence .w { font-family: var(--mono); font-weight: 600; }

.attn-heads { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 1.4rem; }

.head-btn {
  font-family: var(--mono);
  font-size: 12.5px;
  min-width: 32px;
  padding: 4px 8px;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  background: transparent;
  color: var(--muted);
}

.head-btn:hover { border-color: var(--accent); }
.head-btn.is-active { background: var(--ink); border-color: var(--ink); color: var(--bg); }

.inline-progress {
  font-size: 14px;
  color: var(--muted);
  font-family: var(--mono);
}

.inline-progress .track {
  height: 3px;
  background: var(--hairline);
  border-radius: 2px;
  margin-top: 8px;
  overflow: hidden;
}

.inline-progress .fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.2s;
}

/* ─── §4 Logits ─── */

.logit-rows { display: flex; flex-direction: column; gap: 7px; }

.logit-row {
  display: grid;
  grid-template-columns: 9ch 7ch 1fr 6ch;
  gap: 12px;
  align-items: center;
  font-family: var(--mono);
  font-size: 14px;
}

.logit-row .word {
  text-align: right;
  white-space: pre;
  overflow: hidden;
  text-overflow: ellipsis;
}

.logit-row .logit-val { color: var(--muted); font-size: 12.5px; text-align: right; }

.logit-row .bar-track { height: 16px; }

.logit-row .bar {
  height: 100%;
  min-width: 1px;
  background: var(--blue);
  opacity: 0.75;
  border-radius: 2px;
  transition: width 0.25s ease-out;
}

.logit-row .pct { color: var(--muted); font-size: 12.5px; }

.ctrl {
  margin-top: 2rem;
  border-top: 1px solid var(--hairline);
  padding-top: 1.4rem;
}

.ctrl__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 14px;
  margin-bottom: 6px;
}

.ctrl__row .val { font-family: var(--mono); font-weight: 600; }

.ctrl__ends {
  display: flex;
  justify-content: space-between;
  font-size: 11.5px;
  color: var(--muted);
  margin-top: 4px;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  border-radius: 2px;
  background: var(--hairline);
  outline: none;
  margin: 8px 0 0;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent);
  cursor: grab;
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px var(--accent);
  cursor: grab;
}

/* ─── §5 Muestreo ─── */

.ruleta {
  display: flex;
  height: 54px;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--card);
}

.ruleta__seg {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 13px;
  white-space: pre;
  overflow: hidden;
  min-width: 2px;
  transition: width 0.3s ease-out;
  border-right: 1px solid rgba(0, 0, 0, 0.06);
}

.ruleta__seg.is-sampled {
  box-shadow: inset 0 0 0 2.5px var(--accent);
  font-weight: 700;
}

.ruleta__seg.is-sampled::after {
  content: "★";
  position: absolute;
  top: 2px;
  right: 4px;
  color: var(--accent);
  font-size: 11px;
}

@keyframes seg-flash {
  0% { filter: brightness(1.25) saturate(2); }
  100% { filter: none; }
}

.ruleta__seg.flash { animation: seg-flash 0.6s ease-out; }

.cut-list {
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  line-height: 2;
}

.cut-list .cut {
  text-decoration: line-through;
  opacity: 0.6;
  margin-right: 10px;
  white-space: pre;
}

.cut-list .cut-reason { font-size: 11px; opacity: 0.8; }

.sample-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 1.4rem;
  flex-wrap: wrap;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
}

.toggle input { accent-color: var(--accent); }

/* ─── §6 El bucle ─── */

.bucle-text {
  font-family: var(--mono);
  font-size: 21px;
  line-height: 1.9;
  word-break: break-word;
}

.bucle-text .gen { color: var(--accent); font-weight: 600; }

.bucle-text .new {
  color: var(--accent);
  font-weight: 700;
  border-bottom: 2px solid var(--accent);
}

.bucle-history {
  margin-top: 1.8rem;
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--muted);
  line-height: 2;
}

.bucle-history__title {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.bucle-actions { margin-top: 2rem; }

.bucle-wait { font-size: 15px; color: var(--muted); }

/* ─── Footer ─── */

.footer {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  padding: 3rem 24px;
  border-top: 1px solid var(--hairline);
}

/* ─── Modo presentación (?presentar o tecla P) ─── */

/* visibility (no display): conserva el layout para que el scroll sea estable */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  visibility: hidden;
  transition: opacity 0.5s ease, transform 0.5s ease, visibility 0s linear 0.5s;
}

.reveal--shown {
  opacity: 1;
  transform: none;
  visibility: visible;
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* que los pasos no queden bajo la barra sticky al hacer scrollIntoView */
.stage__prose > *,
.stage__widget {
  scroll-margin-top: 70px;
  scroll-margin-bottom: 24px;
}

.presenter-hud {
  position: fixed;
  right: 16px;
  bottom: 14px;
  z-index: 60;
  font-size: 12px;
  color: var(--muted);
  background: var(--bg);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 6px 12px;
  box-shadow: 0 2px 10px rgba(31, 30, 28, 0.08);
}

.presenter-hud[hidden] { display: none; }

/* ─── Responsive ─── */

@media (max-width: 900px) {
  /* El rail pasa a tira horizontal flotante abajo (solo puntos) */
  .rail {
    top: auto;
    bottom: 14px;
    left: 50%;
    transform: translateX(-50%);
    flex-direction: row;
    gap: 14px;
    padding: 9px 14px;
    background: var(--bg);
    border: 1px solid var(--hairline);
    border-radius: 999px;
    box-shadow: 0 2px 10px rgba(31, 30, 28, 0.08);
  }

  .rail__label { display: none; }

  .stage { padding: 4rem 20px; min-height: auto; }

  .stage__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .context-bar { padding-left: 20px; }

  .hero__form { flex-direction: column; }
}

/* ─── Movimiento reducido ─── */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}