/* =========================================================
   Sofía Velasco. Sistema de diseño.
   Concepto: cuaderno de laboratorio. Papel, tinta, y el verde
   como señal. Sin tarjetas, sin sombras, sin esquinas redondeadas.
   ========================================================= */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, textarea, select { font: inherit; color: inherit; }
ul[role="list"], ol[role="list"] { list-style: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- Tokens ---------- */
:root {
  /* Papel y tinta */
  --paper:        #F3F2EC;
  --paper-2:      #EAE8DF;
  --ink:          #10150F;
  --ink-2:        #3E463C;
  --ink-3:        #61685C;
  --rule:         #CFCDC1;
  --rule-strong:  #A9A79A;

  /* Señal */
  --signal:       #0FA968;   /* el verde de marca: bloques, bordes, display */
  --signal-text:  #05643B;   /* variante accesible para texto sobre papel */
  --signal-soft:  #DCEFE4;
  --signal-ink:   #04120B;   /* tinta sobre bloque verde */

  /* Tipografía */
  --display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans:    "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --serif:   "Newsreader", Georgia, "Times New Roman", serif;

  /* Retícula */
  --rail: 208px;
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --measure: 68ch;
  --step: 1.6rem;

  /* Escala tipográfica fluida */
  --t-xs:  0.6875rem;
  --t-sm:  0.8125rem;
  --t-base: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);
  --t-lg:  clamp(1.125rem, 1.05rem + 0.4vw, 1.375rem);
  /* Escala coherente entre portada e interiores: la portada es un punto
     por encima, no el doble. Ratio 3xl/2xl = 1,22 · 2xl/xl = 1,64 */
  --t-xl:  clamp(1.625rem, 1.3rem + 1.5vw, 2.75rem);
  --t-2xl: clamp(2.25rem, 1.7rem + 2.6vw, 4.5rem);
  --t-3xl: clamp(2.75rem, 2.05rem + 3.5vw, 5.5rem);
}

:root:not([data-theme="light"]) {
  @media (prefers-color-scheme: dark) {
    --paper:       #0C100E;
    --paper-2:     #141A16;
    --ink:         #EDEDE5;
    --ink-2:       #B4BAAF;
    --ink-3:       #7E857A;
    --rule:        #2A322C;
    --rule-strong: #414A43;
    --signal:      #23C77E;
    --signal-text: #4FE0A0;
    --signal-soft: #12281D;
    --signal-ink:  #04120B;
  }
}

:root[data-theme="dark"] {
  --paper:       #0C100E;
  --paper-2:     #141A16;
  --ink:         #EDEDE5;
  --ink-2:       #B4BAAF;
  --ink-3:       #7E857A;
  --rule:        #2A322C;
  --rule-strong: #414A43;
  --signal:      #23C77E;
  --signal-text: #4FE0A0;
  --signal-soft: #12281D;
  --signal-ink:  #04120B;
}

/* ---------- Base ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--t-base);
  line-height: 1.6;
  font-synthesis-weight: none;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--signal); color: var(--signal-ink); }

a { color: inherit; text-underline-offset: .22em; text-decoration-thickness: 1px; }
a:hover { text-decoration-color: var(--signal); }

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

.skip {
  position: absolute; left: -9999px;
  background: var(--ink); color: var(--paper);
  padding: .6rem 1rem; z-index: 100;
  font-family: var(--mono); font-size: var(--t-sm);
}
.skip:focus { left: 1rem; top: 1rem; }

/* Oculta visualmente un encabezado estructural (jerarquía H1→H2→H3
   correcta para SEO/lectores de pantalla) sin alterar el diseño. */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Utilidades tipográficas ---------- */
.mono {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}

.display {
  font-family: var(--display);
  font-weight: 400;
  line-height: .94;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.eyebrow {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--signal-text);
  display: flex;
  align-items: center;
  gap: 1.1rem;
  line-height: 1.4;
}
.eyebrow::before {
  content: "";
  width: 2rem; height: 1px;
  background: var(--signal);
  flex: none;
}

/* ---------- Estructura: raíl + lienzo ---------- */
.shell {
  display: grid;
  grid-template-columns: 1fr;
  min-height: 100vh;
}

@media (min-width: 1080px) {
  .shell { grid-template-columns: var(--rail) minmax(0, 1fr); }
}

/* --- Raíl lateral --- */
.rail {
  border-bottom: 1px solid var(--rule);
  padding: .9rem var(--gutter) .75rem;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: .7rem;
  min-width: 0;
  background: var(--paper);
  position: sticky; top: 0; z-index: 40;
}

@media (min-width: 1080px) {
  .rail {
    position: sticky;
    top: 0;
    height: 100vh;
    border-bottom: 0;
    border-right: 1px solid var(--rule);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 2rem 1.5rem;
    gap: 2.5rem;
  }
}

.brand {
  font-family: var(--display);
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -0.02em;
  text-decoration: none;
  display: block;
}
.brand span { color: var(--signal-text); }
.brand small {
  display: none;
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: .75rem;
  line-height: 1.5;
  max-width: 15ch;
}
@media (min-width: 1080px) { .brand small { display: block; } }

/* Navegación: índice numerado tipo protocolo */
.nav { display: none; }
@media (min-width: 1080px) {
  .nav { display: block; margin-top: auto; }
}
.nav ol { list-style: none; counter-reset: n; }
.nav li { counter-increment: n; border-top: 1px solid var(--rule); }
.nav li:last-child { border-bottom: 1px solid var(--rule); }
.nav a {
  display: flex;
  gap: .75rem;
  align-items: baseline;
  padding: .55rem 0;
  text-decoration: none;
  font-size: var(--t-sm);
  color: var(--ink-2);
  transition: color .15s;
}
.nav a::before {
  content: counter(n, decimal-leading-zero);
  font-family: var(--mono);
  font-size: var(--t-xs);
  color: var(--ink-3);
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a[aria-current="page"]::before { color: var(--signal-text); }
.nav a[aria-current="page"] { font-weight: 600; }

.rail-foot {
  font-family: var(--mono);
  font-size: var(--t-xs);
  color: var(--ink-3);
  line-height: 1.7;
  display: none;
}
@media (min-width: 1080px) { .rail-foot { display: block; } }

/* Navegación móvil */
.nav-mobile {
  display: flex;
  gap: 1.1rem;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
  padding-bottom: .15rem;
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.nav-mobile::-webkit-scrollbar { display: none; }
.nav-mobile a { text-decoration: none; color: var(--ink-3); white-space: nowrap; }
.nav-mobile a[aria-current="page"] { color: var(--signal-text); }
@media (min-width: 1080px) { .nav-mobile { display: none; } }

/* --- Lienzo --- */
.canvas { min-width: 0; }

.section {
  padding: clamp(3rem, 8vw, 7rem) var(--gutter);
  border-bottom: 1px solid var(--rule);
}
.section:last-child { border-bottom: 0; }
.section--tight { padding-top: clamp(1.75rem, 3.5vw, 3rem); padding-bottom: clamp(2.5rem, 6vw, 5rem); }
.section--fill { background: var(--paper-2); }

.wrap { max-width: 1180px; min-width: 0; }
.prose-wrap { max-width: var(--measure); }

/* ---------- Portada ---------- */
.hero { padding-block: clamp(3.5rem, 11vw, 9rem); }

.hero h1 {
  font-family: var(--display);
  font-size: var(--t-3xl);
  line-height: .92;
  letter-spacing: -0.03em;
  font-weight: 400;
  margin-top: 1.75rem;
  max-width: 16ch;
  text-wrap: balance;
}
.hero h1 em {
  font-style: italic;
  color: var(--signal-text);
}

.hero-sub {
  margin-top: 2rem;
  font-size: var(--t-lg);
  color: var(--ink-2);
  max-width: 46ch;
  line-height: 1.5;
  text-wrap: pretty;
}

/* Tira de mediciones */
.readout {
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
  border-top: 1px solid var(--ink);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 190px), 1fr));
}
.readout div {
  padding: 1.1rem 1.25rem 1.25rem 0;
  border-right: 1px solid var(--rule);
}
.readout div:not(:first-child) { padding-left: 1.25rem; }
.readout div:last-child { border-right: 0; border-bottom: 0; }
@media (max-width: 620px) {
  .readout div { border-right: 0; border-bottom: 1px solid var(--rule); padding-right: 0; padding-left: 0; }
}
.readout dt {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.readout dd {
  font-family: var(--display);
  font-size: clamp(2rem, 1.5rem + 2vw, 3.25rem);
  line-height: 1;
  margin-top: .5rem;
  letter-spacing: -0.02em;
}
.readout dd small {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .06em;
  color: var(--ink-3);
  display: block;
  margin-top: .5rem;
  text-transform: none;
  line-height: 1.5;
}

/* ---------- Cabecera de página interior ---------- */
/* Sin línea inferior: se apoya en la regla de la sección siguiente */
.pagehead {
  padding-top: clamp(2.75rem, 7vw, 5.5rem);
  padding-bottom: clamp(1.5rem, 3vw, 2.5rem);
  border-bottom: 0;
}
.pagehead h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: var(--t-2xl);
  line-height: .96;
  letter-spacing: -0.025em;
  margin-top: 1.25rem;
  max-width: 18ch;
  text-wrap: balance;
}
.pagehead p:not(.eyebrow) {
  margin-top: 1.5rem;
  max-width: 52ch;
  color: var(--ink-2);
  font-size: var(--t-lg);
  line-height: 1.5;
  text-wrap: pretty;
}

/* ---------- Títulos de sección ---------- */
.section-title {
  font-family: var(--display);
  font-weight: 400;
  font-size: var(--t-xl);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-top: 1.1rem;
  max-width: 24ch;
  text-wrap: balance;
}

/* ---------- Índice de artículos ---------- */
.index { border-top: 1px solid var(--ink); margin-top: 2.5rem; }

.entry {
  display: grid;
  gap: .4rem 2rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  position: relative;
  transition: padding-left .2s ease;
}
@media (min-width: 780px) {
  .entry {
    grid-template-columns: 8.5rem minmax(0, 1fr) 9rem;
    align-items: baseline;
    padding-block: 1.9rem;
  }
}
.entry:hover { padding-left: .85rem; }
.entry::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px; background: var(--signal);
  transform: scaleY(0); transform-origin: top;
  transition: transform .2s ease;
}
.entry:hover::before { transform: scaleY(1); }

.entry-date {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .07em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.entry-title {
  display: block;
  margin: 0;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.5rem, 1.2rem + 1.35vw, 2.4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.entry-note {
  display: block;
  margin-top: .5rem;
  color: var(--ink-2);
  font-size: var(--t-sm);
  line-height: 1.55;
  max-width: 58ch;
  text-wrap: pretty;
}
.entry-tag {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--signal-text);
}
@media (min-width: 780px) { .entry-tag { text-align: right; } }

/* ---------- Bloques numerados (método) ---------- */
.steps { counter-reset: s; margin-top: 2.5rem; border-top: 1px solid var(--ink); }
.step {
  counter-increment: s;
  padding: 2rem 0;
  border-bottom: 1px solid var(--rule);
  display: grid;
  gap: .75rem 2.5rem;
}
@media (min-width: 780px) {
  .step { grid-template-columns: 5rem minmax(0, 1fr); }
}
.step::before {
  content: counter(s, decimal-leading-zero);
  font-family: var(--display);
  font-size: 2.5rem;
  line-height: .8;
  color: var(--signal-text);
}
.step h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: var(--t-lg);
  letter-spacing: -0.015em;
  line-height: 1.15;
}
.step p {
  margin-top: .6rem;
  color: var(--ink-2);
  max-width: 62ch;
  text-wrap: pretty;
}

/* ---------- Fichas de experimento ---------- */
.experiment {
  border: 1px solid var(--rule-strong);
  padding: clamp(1.25rem, 3vw, 2.25rem);
  margin-top: 2rem;
}
.experiment header {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1.25rem;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1rem;
}
.experiment h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: var(--t-lg);
  letter-spacing: -0.015em;
  line-height: 1.1;
}
.status {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: .28rem .6rem;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.status--live   { color: var(--signal-text); }
.status--closed { color: var(--ink-3); }

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-top: 1.5rem;
}
.metrics > div { background: var(--paper); padding: 1rem; }
.metrics dt {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
  line-height: 1.4;
}
.metrics dd {
  font-family: var(--display);
  font-size: 1.9rem;
  line-height: 1;
  margin-top: .6rem;
  letter-spacing: -0.02em;
}
.experiment-body { margin-top: 1.5rem; max-width: var(--measure); }
.experiment-body p + p { margin-top: 1rem; }
.experiment-body p { color: var(--ink-2); text-wrap: pretty; }

/* Bloque de resultados al cierre de la ficha */
.findings {
  margin-top: 2.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule-strong);
}
.findings-body { margin-top: 1.25rem; }
.findings-body p + p { margin-top: 1rem; }
.findings-body p { text-wrap: pretty; }
.findings-body strong { font-weight: 650; color: var(--ink); }
.findings-body > p:first-child { color: var(--ink-2); }

/* ---------- Cuerpo de artículo ---------- */
.article-head {
  padding-block: clamp(2.5rem, 7vw, 5rem);
  border-bottom: 1px solid var(--ink);
}
.article-head h1 {
  font-family: var(--display);
  font-weight: 400;
  font-size: var(--t-2xl);
  line-height: .98;
  letter-spacing: -0.03em;
  margin-top: 1.25rem;
  max-width: 20ch;
  text-wrap: balance;
}
.article-meta {
  margin-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.5rem;
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* La sección de cuerpo va pegada a la cabecera del artículo */
.article-head + .section { padding-top: clamp(2rem, 4vw, 3.25rem); }

.prose {
  font-family: var(--serif);
  font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.1875rem);
  line-height: 1.7;
  max-width: var(--measure);
  color: var(--ink);
}
.prose > * + * { margin-top: 1.35em; }
/* Entradilla: el primer párrafo entra un punto por encima */
.prose > p:first-child {
  font-size: 1.14em;
  line-height: 1.55;
  color: var(--ink);
}
.prose h2 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(1.625rem, 1.3rem + 1.3vw, 2.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin-top: 2.4em;
  text-wrap: balance;
}
.prose h3 {
  font-family: var(--sans);
  font-weight: 650;
  font-size: 1.0625rem;
  letter-spacing: .01em;
  margin-top: 2em;
}
.prose a { color: var(--signal-text); text-decoration-thickness: 1px; }
.prose strong { font-weight: 650; }
.prose ul, .prose ol { padding-left: 1.35em; }
.prose li + li { margin-top: .5em; }
.prose li::marker { color: var(--signal-text); }
.prose blockquote {
  border-left: 2px solid var(--signal);
  padding-left: 1.4em;
  font-style: italic;
  color: var(--ink-2);
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin-block: 2.5em;
}
.prose code {
  font-family: var(--mono);
  font-size: .875em;
  background: var(--paper-2);
  padding: .12em .35em;
  border: 1px solid var(--rule);
}
.prose pre {
  font-family: var(--mono);
  font-size: var(--t-sm);
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding: 1rem;
  overflow-x: auto;
}
.prose pre code { background: none; border: 0; padding: 0; }
.prose figure figcaption {
  font-family: var(--mono);
  font-size: var(--t-xs);
  color: var(--ink-3);
  margin-top: .75rem;
  line-height: 1.6;
}
.prose table { width: 100%; border-collapse: collapse; font-family: var(--sans); font-size: var(--t-sm); }
.prose th, .prose td { border: 1px solid var(--rule); padding: .55rem .7rem; text-align: left; }
.prose th { background: var(--paper-2); font-weight: 600; }
.table-scroll { overflow-x: auto; }

/* ---------- Enlaces con flecha ---------- */
.arrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--mono);
  font-size: var(--t-sm);
  letter-spacing: .06em;
  text-transform: uppercase;
  text-decoration: none;
  border-bottom: 1px solid var(--signal);
  padding-bottom: .3rem;
  color: var(--ink);
}
.arrow::after { content: "\2192"; transition: transform .18s ease; color: var(--signal-text); }
.arrow:hover::after { transform: translateX(.3rem); }

/* ---------- Suscripción ---------- */
.subscribe { display: grid; gap: clamp(1.75rem, 4vw, 3.5rem); }
@media (min-width: 900px) {
  .subscribe { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
}
.subscribe-text {
  margin-top: 1.25rem;
  color: var(--ink-2);
  max-width: 46ch;
  text-wrap: pretty;
}

.subscribe-form label {
  display: block;
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: .7rem;
}
.subscribe-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  border-top: 1px solid var(--ink);
  padding-top: .75rem;
}
.subscribe-row input {
  flex: 1 1 14rem;
  min-width: 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule-strong);
  padding: .55rem .1rem;
  font-family: var(--sans);
  font-size: var(--t-base);
  color: var(--ink);
}
.subscribe-row input::placeholder { color: var(--ink-3); }
.subscribe-row input:focus {
  outline: none;
  border-bottom-color: var(--signal);
}
.subscribe-row input:focus-visible { outline: none; }
.subscribe-row button {
  flex: 0 0 auto;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  padding: .65rem 1.4rem;
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.subscribe-row button:hover {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--signal-ink);
}
.subscribe-note {
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: var(--t-xs);
  line-height: 1.7;
  color: var(--ink-3);
  max-width: 52ch;
}
.subscribe-note a { color: var(--signal-text); }

/* ---------- Contacto ---------- */
.contact-lines { margin-top: 2.5rem; border-top: 1px solid var(--ink); }
.contact-lines a {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  font-family: var(--display);
  font-size: clamp(1.5rem, 1.2rem + 1.35vw, 2.4rem);
  letter-spacing: -0.02em;
  transition: color .15s;
}
.contact-lines a:hover { color: var(--signal-text); }
.contact-lines span {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ---------- Pie ---------- */
.foot {
  padding: 2.5rem var(--gutter) 3.5rem;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .06em;
  color: var(--ink-3);
}
.foot a { text-decoration: none; }
.foot a:hover { color: var(--ink); }
.foot nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }

/* ---------- Conmutador de tema ---------- */
.theme-toggle {
  background: none;
  border: 1px solid var(--rule-strong);
  padding: .3rem .6rem;
  cursor: pointer;
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink); }

/* ---------- Paginación / anterior-siguiente ---------- */
.pager {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border-block: 1px solid var(--rule);
  margin-top: 3rem;
}
@media (min-width: 700px) { .pager { grid-template-columns: 1fr 1fr; } }
.pager a {
  background: var(--paper);
  padding: 1.5rem;
  text-decoration: none;
  display: block;
}
.pager a:hover { background: var(--paper-2); }
.pager small {
  font-family: var(--mono);
  font-size: var(--t-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.pager strong {
  display: block;
  margin-top: .6rem;
  font-family: var(--display);
  font-weight: 400;
  font-size: var(--t-lg);
  line-height: 1.15;
  letter-spacing: -0.015em;
}

/* ---------- Nota al pie de sección ---------- */
.note {
  margin-top: 2rem;
  border-left: 2px solid var(--rule-strong);
  padding-left: 1.25rem;
  font-family: var(--mono);
  font-size: var(--t-sm);
  line-height: 1.65;
  color: var(--ink-3);
  max-width: 58ch;
}

/* ---------- Dos columnas ---------- */
.split { display: grid; gap: clamp(1.5rem, 4vw, 3.5rem); }
@media (min-width: 900px) {
  .split { grid-template-columns: minmax(0, 20rem) minmax(0, 1fr); align-items: start; }
  .split--wide { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }
}
.split-aside { position: sticky; top: 6rem; }
@media (max-width: 899px) { .split-aside { position: static; } }