:root {
  --surface-base: oklch(98.6% 0.006 110);
  --surface-raised: oklch(96.2% 0.009 110);
  --surface-sunken: oklch(93.4% 0.012 110);
  --content-default: oklch(24% 0.014 110);
  --content-muted: oklch(46% 0.012 110);
  --content-faint: oklch(60% 0.010 110);
  --border-subtle: oklch(89% 0.010 110);
  --border-strong: oklch(24% 0.014 110);
  --accent: oklch(48% 0.125 130);
  --accent-hover: oklch(38% 0.115 130);
  --accent-wash: oklch(94% 0.045 118);

  --band-0: oklch(66% 0.045 235);
  --band-1: oklch(74% 0.115 78);
  --band-2: oklch(64% 0.155 45);
  --band-3: oklch(62% 0.150 132);

  --display: "Newsreader", Georgia, serif;
  --ui: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --measure: 68ch;
  --rule: 1px solid var(--border-subtle);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface-base: oklch(17.5% 0.010 110);
    --surface-raised: oklch(21.5% 0.012 110);
    --surface-sunken: oklch(14.5% 0.010 110);
    --content-default: oklch(92% 0.008 110);
    --content-muted: oklch(70% 0.010 110);
    --content-faint: oklch(56% 0.010 110);
    --border-subtle: oklch(30% 0.012 110);
    --border-strong: oklch(92% 0.008 110);
    --accent: oklch(86% 0.185 118);
    --accent-hover: oklch(94% 0.190 118);
    --accent-wash: oklch(26% 0.055 118);

    --band-0: oklch(72% 0.055 235);
    --band-1: oklch(80% 0.120 80);
    --band-2: oklch(72% 0.160 48);
    --band-3: oklch(80% 0.175 130);
  }
}

/* selección explícita de tema: gana sobre la preferencia del sistema */

:root[data-tema="claro"] {
  --surface-base: oklch(98.6% 0.006 110);
  --surface-raised: oklch(96.2% 0.009 110);
  --surface-sunken: oklch(93.4% 0.012 110);
  --content-default: oklch(24% 0.014 110);
  --content-muted: oklch(46% 0.012 110);
  --content-faint: oklch(60% 0.010 110);
  --border-subtle: oklch(89% 0.010 110);
  --border-strong: oklch(24% 0.014 110);
  --accent: oklch(48% 0.125 130);
  --accent-hover: oklch(38% 0.115 130);
  --accent-wash: oklch(94% 0.045 118);
  --band-0: oklch(66% 0.045 235);
  --band-1: oklch(74% 0.115 78);
  --band-2: oklch(64% 0.155 45);
  --band-3: oklch(62% 0.150 132);
}

:root[data-tema="oscuro"] {
  --surface-base: oklch(17.5% 0.010 110);
  --surface-raised: oklch(21.5% 0.012 110);
  --surface-sunken: oklch(14.5% 0.010 110);
  --content-default: oklch(92% 0.008 110);
  --content-muted: oklch(70% 0.010 110);
  --content-faint: oklch(56% 0.010 110);
  --border-subtle: oklch(30% 0.012 110);
  --border-strong: oklch(92% 0.008 110);
  --accent: oklch(86% 0.185 118);
  --accent-hover: oklch(94% 0.190 118);
  --accent-wash: oklch(26% 0.055 118);
  --band-0: oklch(72% 0.055 235);
  --band-1: oklch(80% 0.120 80);
  --band-2: oklch(72% 0.160 48);
  --band-3: oklch(80% 0.175 130);
}

:root[data-tema="lectura"] {
  --surface-base: oklch(95.8% 0.022 92);
  --surface-raised: oklch(93.4% 0.026 92);
  --surface-sunken: oklch(90.8% 0.030 92);
  --content-default: oklch(27% 0.018 78);
  --content-muted: oklch(45% 0.016 78);
  --content-faint: oklch(56% 0.014 78);
  --border-subtle: oklch(86% 0.026 92);
  --border-strong: oklch(27% 0.018 78);
  --accent: oklch(44% 0.085 135);
  --accent-hover: oklch(35% 0.080 135);
  --accent-wash: oklch(90% 0.045 110);
  --band-0: oklch(60% 0.035 235);
  --band-1: oklch(66% 0.085 80);
  --band-2: oklch(58% 0.110 48);
  --band-3: oklch(54% 0.100 132);
  --measure: 60ch;
}

:root[data-tema="lectura"] body {
  font-size: 1.1875rem;
  line-height: 1.72;
}

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

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

body {
  margin: 0;
  background: var(--surface-base);
  color: var(--content-default);
  font-family: var(--display);
  font-size: 1.0625rem;
  line-height: 1.62;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent-wash); color: var(--content-default); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--surface-raised);
  color: var(--content-default);
  padding: 0.75rem 1rem;
  font-family: var(--ui);
  font-size: 0.875rem;
  z-index: 10;
}
.skip:focus { left: 0; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--accent-hover); }

/* masthead */

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem 2rem;
  flex-wrap: wrap;
  padding: 1.4rem clamp(1.25rem, 5vw, 4rem);
  border-bottom: var(--rule);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--content-default);
  text-decoration: none;
  font-family: var(--ui);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 0.7rem;
  height: 0.7rem;
  background: var(--accent);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

/* page frames */

.page {
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1.25rem, 5vw, 4rem) 4rem;
  max-width: 78rem;
  margin: 0 auto;
}

.kicker {
  font-family: var(--ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--content-faint);
  margin: 0 0 1.1rem;
}

h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  line-height: 1.03;
  letter-spacing: -0.025em;
  margin: 0;
}

.page-index { max-width: 62rem; }

.hero { max-width: 46rem; margin-bottom: clamp(3rem, 7vw, 5.5rem); }

.hero-lede {
  margin-top: 1.6rem;
  max-width: 40rem;
}
.hero-lede p {
  font-size: clamp(1.1875rem, 2.2vw, 1.4375rem);
  line-height: 1.48;
  color: var(--content-muted);
  margin: 0 0 1rem;
}
.hero-lede p:first-child { color: var(--content-default); }

/* the calibrated band scale */

.scale {
  border-top: 2px solid var(--border-strong);
  padding-top: 1.6rem;
  margin-bottom: clamp(3rem, 7vw, 5rem);
}

.scale-h {
  font-family: var(--ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  margin: 0 0 0.9rem;
  color: var(--content-default);
}

.scale-lede {
  max-width: var(--measure);
  color: var(--content-muted);
  margin: 0 0 2.2rem;
}

.bands {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.band {
  padding: 0.95rem 1.1rem 1.4rem 0;
  border-top: 4px solid var(--band);
  position: relative;
}
.band + .band { padding-left: 1.1rem; }
/* first item of each row starts flush and carries no column rule */
.band:nth-child(4n + 1) { padding-left: 0; }
.band:nth-child(4n + 1)::before { content: none; }
.band + .band::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05rem;
  bottom: 1.4rem;
  border-left: var(--rule);
}

.band-0 { --band: var(--band-0); }
.band-1 { --band: var(--band-1); }
.band-2 { --band: var(--band-2); }
.band-3 { --band: var(--band-3); }

.band-range {
  display: block;
  font-family: var(--ui);
  font-variant-numeric: tabular-nums;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--content-faint);
}

.band-name {
  display: block;
  font-size: 1.5rem;
  line-height: 1.2;
  margin: 0.35rem 0 0.45rem;
  letter-spacing: -0.015em;
}

.band-note {
  display: block;
  font-size: 0.9375rem;
  line-height: 1.42;
  color: var(--content-muted);
}

/* doc pages */

.page-doc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15rem;
  grid-template-areas: "head head" "body toc";
  column-gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.doc-head {
  grid-area: head;
  margin-bottom: clamp(2.25rem, 4vw, 3rem);
  padding-bottom: 1.75rem;
  border-bottom: 2px solid var(--border-strong);
}
.doc-head h1 { max-width: 20ch; }

.doc-lede {
  margin: 1.25rem 0 0;
  font-size: 1.1875rem;
  line-height: 1.5;
  color: var(--content-muted);
  max-width: 40ch;
}

.page-doc .prose { grid-area: body; }
.page-doc-notoc { grid-template-columns: minmax(0, 1fr); grid-template-areas: "head" "body"; }

.toc {
  grid-area: toc;
  position: sticky;
  top: 2rem;
  font-family: var(--ui);
  font-size: 0.8125rem;
  line-height: 1.4;
}

.toc-h {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--content-faint);
  margin: 0 0 0.85rem;
  padding-bottom: 0.6rem;
  border-bottom: var(--rule);
}

.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc;
}
.toc li { margin-bottom: 0.55rem; }
.toc a {
  color: var(--content-muted);
  text-decoration: none;
  display: block;
  transition: color 140ms var(--ease);
}
.toc a:hover { color: var(--accent); }

/* prose */

.prose { max-width: var(--measure); }

.prose > * { margin: 1.05em 0 0; }
.prose > :first-child { margin-top: 0; }

.prose h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.75rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-top: 2.2em;
  padding-top: 1.1rem;
  border-top: var(--rule);
}
.prose > h2:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.prose h2 + * { margin-top: 0.85em; }

.prose h3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.1875rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-top: 1.9em;
}
.prose h3 + * { margin-top: 0.55em; }

.prose strong { font-weight: 600; }

.prose ul, .prose ol { margin: 0; padding-left: 1.35rem; }
.prose li + li { margin-top: 0.5em; }
.prose li::marker { color: var(--content-faint); }

.prose blockquote {
  margin: 0;
  padding-left: 1.25rem;
  border-left: 2px solid var(--accent);
  color: var(--content-muted);
  font-style: italic;
}

.prose hr {
  border: 0;
  border-top: var(--rule);
  margin: 2.6em 0;
}

.prose code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--surface-sunken);
  padding: 0.12em 0.36em;
  border-radius: 2px;
}

.prose pre {
  background: var(--surface-sunken);
  border-left: 2px solid var(--border-subtle);
  padding: 1.05rem 1.2rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.55;
}
.prose pre code { background: none; padding: 0; font-size: 1em; }

/* tables carry the rubric, so they get the most care */

.prose .table-wrap { overflow-x: auto; }

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--ui);
  font-size: 0.875rem;
  line-height: 1.45;
  font-variant-numeric: tabular-nums;
}

.prose thead th {
  text-align: left;
  font-weight: 600;
  font-size: 0.6875rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--content-faint);
  padding: 0 0.9rem 0.6rem 0;
  border-bottom: 1px solid var(--border-strong);
  white-space: nowrap;
}

.prose tbody td {
  padding: 0.72rem 0.9rem 0.72rem 0;
  border-bottom: var(--rule);
  vertical-align: top;
}
.prose tbody tr:last-child td { border-bottom: 0; }
.prose tbody td:first-child { color: var(--content-default); font-weight: 500; white-space: nowrap; }
.prose tbody td:not(:first-child) { color: var(--content-muted); }
.prose table a { font-family: var(--display); }

/* colophon */

.colophon {
  border-top: var(--rule);
  padding: 2rem clamp(1.25rem, 5vw, 4rem) 3.5rem;
  font-family: var(--ui);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--content-faint);
  display: flex;
  justify-content: space-between;
  gap: 0.6rem 2rem;
  flex-wrap: wrap;
}
.colophon p { margin: 0; }
.colophon a { color: var(--content-muted); }
.colophon a:hover { color: var(--accent); }

@media (max-width: 62rem) {
  .page-doc {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "head" "toc" "body";
  }
  .toc {
    position: static;
    margin-bottom: 2.75rem;
    padding-bottom: 0.5rem;
  }
  .toc ol { columns: 2; column-gap: 2rem; }
}

@media (max-width: 46rem) {
  .bands { grid-template-columns: 1fr 1fr; }
  .band, .band + .band { padding-left: 0; padding-right: 1rem; }
  .band + .band::before { display: none; }
  .toc ol { columns: 1; }
}

@media (max-width: 30rem) {
  .bands { grid-template-columns: 1fr; }
}

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

html { scroll-behavior: smooth; }
:target { scroll-margin-top: 2rem; }

/* lado derecho de la cabecera: pestañas + switch */

.masthead-derecha {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2vw, 1.4rem);
  flex-wrap: wrap;
}

.tabs {
  display: flex;
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  overflow: hidden;
  font-family: var(--ui);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}
.tabs a {
  color: var(--content-muted);
  text-decoration: none;
  padding: 0.4rem 1.05rem;
  border-bottom: 0;
  transition: color 140ms var(--ease), background-color 140ms var(--ease);
}
.tabs a + a { border-left: 1px solid var(--border-subtle); }
.tabs a:hover { color: var(--content-default); background: var(--surface-raised); }
.tabs a[aria-current="page"] {
  color: var(--accent-hover);
  background: var(--accent-wash);
}

/* switch de tema: tres posiciones con pulgar deslizante */

.temas {
  position: relative;
  display: flex;
  align-items: center;
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  padding: 2px;
  background: var(--surface-raised);
}
.temas button {
  appearance: none;
  background: none;
  border: 0;
  margin: 0;
  padding: 0;
  position: relative;
  z-index: 1;
  width: 2.1rem;
  height: 1.7rem;
  display: grid;
  place-items: center;
  color: var(--content-faint);
  cursor: pointer;
  border-radius: 999px;
  transition: color 140ms var(--ease);
}
.temas button:hover { color: var(--content-default); }
.temas button[aria-pressed="true"] { color: var(--accent-hover); }
.temas button svg { display: block; }

.temas-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 2.1rem;
  height: 1.7rem;
  border-radius: 999px;
  background: var(--accent-wash);
  border: 1px solid var(--border-subtle);
  opacity: 0;
  transform: translateX(0);
  transition: transform 200ms var(--ease), opacity 140ms var(--ease);
}
.temas.con-tema .temas-thumb { opacity: 1; }

/* navegación de documentos del proyecto */

.docnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.6rem;
  font-family: var(--ui);
  font-size: 0.8125rem;
  border-bottom: var(--rule);
  padding: 0.9rem clamp(1.25rem, 5vw, 4rem) 0.9rem;
}
.docnav a {
  color: var(--content-muted);
  text-decoration: none;
  padding-bottom: 0.2rem;
  border-bottom: 2px solid transparent;
}
.docnav a:hover { color: var(--content-default); }
.docnav a[aria-current="page"] {
  color: var(--content-default);
  font-weight: 600;
  border-bottom-color: var(--accent);
}
.docnav .docnav-zip {
  margin-left: auto;
  align-self: center;
  border: 1px solid var(--border-strong);
  border-radius: 2px;
  padding: 0.35rem 0.9rem;
  color: var(--content-default);
  transition: color 140ms var(--ease), border-color 140ms var(--ease);
}
.docnav .docnav-zip:hover { color: var(--accent); border-color: var(--accent); }

/* listado de piezas (portada y secciones) */

.seccion {
  border-top: 2px solid var(--border-strong);
  padding-top: 1.4rem;
  margin-top: clamp(2.5rem, 6vw, 4rem);
}
.seccion:first-of-type { margin-top: 0; }
.seccion-h {
  font-family: var(--ui);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  margin: 0 0 1.4rem;
}

.pieza { max-width: var(--measure); margin: 0 0 2.4rem; }
.pieza h3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.8rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}
.pieza h3 a { color: var(--content-default); text-decoration: none; }
.pieza h3 a:hover { color: var(--accent); }
.pieza p { margin: 0 0 0.8rem; color: var(--content-muted); }
.pieza p:first-of-type { color: var(--content-default); }
.pieza-acciones {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.5rem;
  font-family: var(--ui);
  font-size: 0.8125rem;
}

/* piezas próximas, en apagado */

.proximas {
  list-style: none;
  margin: 2.4rem 0 0;
  padding: 0;
  max-width: var(--measure);
}
.proximas li {
  border-top: var(--rule);
  padding: 0.75rem 0;
  color: var(--content-faint);
  font-size: 0.9375rem;
  line-height: 1.5;
}
.proximas strong { color: var(--content-muted); font-weight: 600; }

/* bloque para agentes */

.agente-bloque {
  max-width: var(--measure);
  border-top: 2px solid var(--border-strong);
  padding-top: 1.3rem;
  margin: clamp(2.5rem, 6vw, 4rem) 0 0;
}
.agente-bloque .seccion-h { margin-bottom: 0.9rem; }
.agente-bloque p { margin: 0 0 1rem; color: var(--content-muted); }

.agente-bloque .instruccion-label {
  font-family: var(--ui);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--content-muted);
  margin: 0.4rem 0 0.5rem;
}
.agente-bloque button.copiar + .instruccion-label { margin-top: 2rem; }

.instruccion {
  display: block;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  background: var(--surface-sunken);
  padding: 1rem 1.1rem;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0 0 0.8rem;
}

button.copiar {
  appearance: none;
  font-family: var(--ui);
  font-size: 0.8125rem;
  background: none;
  border: 1px solid var(--border-strong);
  border-radius: 2px;
  color: var(--content-default);
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: color 140ms var(--ease), border-color 140ms var(--ease);
}
button.copiar:hover { color: var(--accent); border-color: var(--accent); }

/* enlace a la versión markdown en cabecera de documento */

.doc-md {
  font-family: var(--ui);
  font-size: 0.8125rem;
  margin-top: 1rem;
}
.doc-md a { color: var(--content-faint); }
.doc-md a:hover { color: var(--accent); }