/* Las palabras tienen hueso — hoja de estilo. Pensada primero para teléfono. */

:root {
  color-scheme: light;
  --papel: #f7f3ea;
  --papel-2: #efe9dc;
  --tinta: #221f1a;
  --tinta-2: #57524a;
  --tinta-3: #8a8378;
  --linea: #ddd5c6;
  --acento: #2a78d6;
  --acento-suave: #dde9f7;
  --verde: #2e7d5b;
  --naranja: #b8531c;
  --azul: #2f5e9e;
  --gris: #6b665e;
  --lengua: #f1cfc4;
  --diente: #ffffff;
  --cabeza: #fbf8f1;
  --serif: "Literata", "Iowan Old Style", "Palatino", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --simbolo: "Noto Serif", "Literata", "Charter", "Times New Roman", serif;
  --barra: 3.25rem;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --papel: #17150f;
    --papel-2: #221f18;
    --tinta: #ece6d9;
    --tinta-2: #bdb5a6;
    --tinta-3: #8c8475;
    --linea: #3a352b;
    --acento: #6aa6ef;
    --acento-suave: #1f2f45;
    --verde: #6cc49a;
    --naranja: #f09a62;
    --azul: #8fb3ea;
    --gris: #b0a898;
    --lengua: #5a3a33;
    --diente: #e8e2d4;
    --cabeza: #201d16;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --papel: #17150f;
  --papel-2: #221f18;
  --tinta: #ece6d9;
  --tinta-2: #bdb5a6;
  --tinta-3: #8c8475;
  --linea: #3a352b;
  --acento: #6aa6ef;
  --acento-suave: #1f2f45;
  --verde: #6cc49a;
  --naranja: #f09a62;
  --azul: #8fb3ea;
  --gris: #b0a898;
  --lengua: #5a3a33;
  --diente: #e8e2d4;
  --cabeza: #201d16;
}
:root[data-size="grande"] { font-size: 112.5%; }
:root[data-size="enorme"] { font-size: 125%; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--barra) + env(safe-area-inset-top, 0px) + 1rem); }
body {
  margin: 0;
  background: var(--papel);
  color: var(--tinta);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.65;
  padding-top: calc(var(--barra) + env(safe-area-inset-top, 0px));
}
.saltar { position: absolute; left: -999px; }
.saltar:focus { left: 1rem; top: 1rem; z-index: 99; background: var(--papel); padding: .5rem 1rem; }

/* ------------------------------------------------ barra superior */
.barra {
  position: fixed; inset: 0 0 auto 0; z-index: 20;
  height: calc(var(--barra) + env(safe-area-inset-top, 0px));
  padding: env(safe-area-inset-top, 0px) max(.5rem, env(safe-area-inset-right, 0px)) 0 max(.5rem, env(safe-area-inset-left, 0px));
  display: flex; align-items: center; gap: .25rem;
  background: color-mix(in srgb, var(--papel) 92%, transparent);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--linea);
  font-family: var(--sans);
}
.barra-t {
  flex: 1; min-width: 0; text-align: center; color: var(--tinta); text-decoration: none;
  font-weight: 600; font-size: .95rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.btn-icono {
  width: 2.75rem; height: 2.75rem; flex: none;
  display: grid; place-items: center;
  border: 0; border-radius: .75rem; background: transparent; color: var(--tinta);
  font: 600 .95rem var(--sans); cursor: pointer;
}
.btn-icono:hover, .btn-icono:focus-visible { background: var(--papel-2); }
.btn-icono svg { width: 1.4rem; height: 1.4rem; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.progreso { position: absolute; left: 0; right: 0; bottom: -1px; height: 3px; }
.progreso span { display: block; height: 100%; width: 0; background: var(--acento); transition: width .1s linear; }

/* ------------------------------------------------ cajón del índice */
.velo { position: fixed; inset: 0; z-index: 30; background: rgba(0,0,0,.35); }
.cajon {
  position: fixed; z-index: 40; top: 0; bottom: 0; left: 0;
  width: min(22rem, 88vw); overflow-y: auto; overscroll-behavior: contain;
  background: var(--papel); border-right: 1px solid var(--linea);
  padding: calc(env(safe-area-inset-top, 0px) + .5rem) 1rem calc(env(safe-area-inset-bottom, 0px) + 2rem);
  font-family: var(--sans); font-size: .95rem;
}
.cajon-cab { display: flex; align-items: center; justify-content: space-between; padding: .25rem 0 .5rem; }
.toc-grupo { margin: 1.1rem 0 .3rem; font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; color: var(--tinta-3); }
.toc { list-style: none; margin: 0; padding: 0; }
.toc a {
  display: flex; gap: .6rem; align-items: baseline; padding: .55rem .5rem; border-radius: .6rem;
  color: var(--tinta); text-decoration: none; line-height: 1.3;
}
.toc a:hover { background: var(--papel-2); }
.toc a[aria-current="page"] { background: var(--acento-suave); font-weight: 600; }
.toc-n { width: 1.4rem; flex: none; text-align: right; color: var(--tinta-3); font-variant-numeric: tabular-nums; }
.toc-pdf { margin-top: 1.5rem; }
.toc-pdf a { color: var(--acento); }

/* ------------------------------------------------ texto */
.texto {
  max-width: 38rem; margin: 0 auto;
  padding-block: 1.5rem 1rem; padding-inline: max(1.1rem, env(safe-area-inset-left, 0px));
}
.eyebrow { font-family: var(--sans); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; color: var(--tinta-3); margin: .5rem 0 .25rem; }
h1 { font-size: 2rem; line-height: 1.15; margin: 0 0 1.5rem; letter-spacing: -.01em; }
h2 { font-size: 1.35rem; line-height: 1.25; margin: 2.2rem 0 .6rem; }
h3 { font-size: 1.1rem; font-style: italic; margin: 1.6rem 0 .4rem; }
p { margin: 0 0 1rem; hyphens: auto; -webkit-hyphens: auto; }
a { color: var(--acento); }
ul, ol { padding-left: 1.3rem; margin: 0 0 1rem; }
li { margin-bottom: .45rem; }
strong { font-weight: 700; }
.c { font-family: var(--simbolo); font-style: normal; font-weight: 600; }

/* tablas: se deslizan de lado si no caben */
.tabla { overflow-x: auto; margin: 1.1rem 0 1.4rem; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; min-width: 100%; font-size: .92rem; line-height: 1.4; }
th, td { text-align: left; padding: .45rem .7rem .45rem 0; border-bottom: 1px solid var(--linea); vertical-align: top; }
th { font-family: var(--sans); font-size: .78rem; letter-spacing: .03em; color: var(--tinta-2); border-bottom: 2px solid var(--tinta-3); }
td:first-child { white-space: nowrap; }

/* recuadros */
.caja {
  margin: 1.4rem 0; padding: .9rem 1rem .2rem;
  border-left: 4px solid var(--k); border-radius: 0 .75rem .75rem 0;
  background: color-mix(in srgb, var(--k) 9%, var(--papel));
  font-size: 1rem; line-height: 1.55;
}
.caja-t { font-family: var(--sans); font-weight: 700; font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; color: var(--k); margin: 0 0 .35rem; }
.pruebalo { --k: var(--verde); }
.ojo { --k: var(--naranja); }
.reto { --k: var(--azul); }
.maslejos { --k: var(--gris); }
.sol { margin: .2rem 0 .9rem; border-top: 1px dashed color-mix(in srgb, var(--k) 45%, transparent); padding-top: .6rem; }
.sol summary, .ver-tabla summary {
  cursor: pointer; font-family: var(--sans); font-weight: 600; font-size: .9rem; color: var(--k, var(--acento));
  padding: .35rem 0; list-style: none; min-height: 2.75rem; display: flex; align-items: center; gap: .4rem;
}
.sol summary::-webkit-details-marker, .ver-tabla summary::-webkit-details-marker { display: none; }
.sol summary::before, .ver-tabla summary::before { content: "▸"; transition: transform .15s; }
.sol[open] summary::before, .ver-tabla[open] summary::before { transform: rotate(90deg); }
.sol .tabla { margin: .5rem 0 1rem; }
blockquote { margin: 1rem 0; padding-left: 1rem; border-left: 3px solid var(--linea); color: var(--tinta-2); }

/* figuras */
.fig { margin: 1.6rem 0 1.8rem; }
.fig svg { display: block; width: 100%; height: auto; max-width: 30rem; margin: 0 auto; font-family: var(--sans); }
.fig figcaption { font-family: var(--sans); font-size: .82rem; line-height: 1.45; color: var(--tinta-2); margin-top: .6rem; text-align: center; }
.fig .sym { font-family: var(--simbolo); }
.f-t { fill: var(--tinta); }
.f-m { fill: var(--tinta-2); }
.f-a { fill: var(--acento); }
.f-b { font-weight: 700; }
.f-faint { fill: var(--tinta-3); opacity: .45; }
.f-l { stroke: var(--tinta); }
.f-lm { stroke: var(--tinta-3); }
.f-mf { fill: var(--tinta-3); }
.f-soft { fill: var(--acento-suave); }
.f-soft-s { fill: var(--acento-suave); stroke: var(--acento); }
.f-card { fill: var(--papel-2); stroke: var(--linea); }
.f-head { fill: none; stroke: var(--tinta); }
.f-air { stroke: var(--acento-suave); }
.f-tongue { fill: var(--lengua); stroke: var(--tinta-2); stroke-width: 1.2; }
.f-tooth { fill: var(--diente); stroke: var(--tinta-2); stroke-width: 1.2; }
.f-mk { fill: var(--acento); }
.f-mkt { fill: var(--papel); font-weight: 700; }
.f-needle { fill: var(--acento); }

/* gráfica de distancias */
.g-grid { stroke: var(--linea); stroke-width: 1; }
.g-base { stroke: var(--tinta-3); stroke-width: 1; }
.g-bar { fill: var(--acento); }
.g-hit { fill: transparent; }
.g-fila:hover .g-bar, .g-fila:focus .g-bar { opacity: .8; }
.g-fila:focus { outline: none; }
.g-fila:focus-visible .g-hit { stroke: var(--acento); stroke-width: 1.5; }
.ver-tabla { margin: -.8rem 0 1.4rem; }
.tip {
  position: fixed; z-index: 50; pointer-events: none; max-width: 16rem;
  background: var(--tinta); color: var(--papel); font: 500 .82rem/1.35 var(--sans);
  padding: .45rem .6rem; border-radius: .5rem; box-shadow: 0 4px 16px rgba(0,0,0,.2);
}

/* ------------------------------------------------ navegación y pie */
.pasos {
  max-width: 38rem; margin: 1.5rem auto 0; padding-inline: max(1.1rem, env(safe-area-inset-left, 0px));
  display: grid; grid-template-columns: 1fr 1fr; gap: .75rem;
}
.paso {
  display: flex; flex-direction: column; gap: .15rem; padding: .8rem 1rem; min-height: 4rem;
  border: 1px solid var(--linea); border-radius: .9rem; text-decoration: none; color: var(--tinta);
  font-family: var(--sans); font-size: .95rem; line-height: 1.3; background: var(--papel);
}
.paso small { color: var(--tinta-3); font-size: .75rem; letter-spacing: .05em; text-transform: uppercase; }
.paso.sig { text-align: right; grid-column: 2; }
.paso:hover { border-color: var(--acento); }
.pie { max-width: 38rem; margin: 2rem auto 0; padding: 1rem max(1.1rem, env(safe-area-inset-left, 0px)) calc(2rem + env(safe-area-inset-bottom, 0px)); font-family: var(--sans); font-size: .78rem; color: var(--tinta-3); }

/* ------------------------------------------------ portada */
.portada { padding-top: 2.5rem; }
.portada-t { font-size: clamp(2.6rem, 11vw, 3.6rem); line-height: 1.02; margin: .4rem 0 1rem; }
.portada-sub { font-size: 1.2rem; font-style: italic; color: var(--tinta-2); }
.portada-sym { font-size: 2rem; color: var(--acento); margin: 1.5rem 0; }
.portada-autor { font-family: var(--sans); font-size: .95rem; color: var(--tinta-2); }
.acciones { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1.5rem 0 2rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 3rem; padding: .6rem 1.2rem;
  border-radius: 999px; border: 1px solid var(--linea); color: var(--tinta); text-decoration: none;
  font: 600 1rem var(--sans); background: var(--papel);
}
.btn-prim { background: var(--acento); border-color: var(--acento); color: #fff; }
:root[data-theme="dark"] .btn-prim { color: #10151d; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn-prim { color: #10151d; } }
.portada-intro { font-size: 1.05rem; }
.portada-grupo { font-family: var(--sans); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; color: var(--tinta-3); margin: 1.8rem 0 .3rem; }
.toc-portada a { font-family: var(--sans); font-size: 1rem; padding: .7rem .5rem; border-bottom: 1px solid var(--linea); border-radius: 0; }

@media (min-width: 48rem) {
  body { font-size: 1.2rem; }
  h1 { font-size: 2.5rem; }
  .texto { padding-block: 3rem 1rem; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }
@media print {
  .barra, .cajon, .velo, .pasos { display: none !important; }
  body { padding-top: 0; }
  details { display: block; }
}
.pie .mas { margin-top: .4rem; }
.pie a { color: var(--acento); }
.mas-portada { margin-top: 0; }
.oculto { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.portada-img { display: block; width: 100%; max-width: 24rem; height: auto; margin: 0 auto; border-radius: .4rem;
  box-shadow: 0 1px 2px rgba(0,0,0,.08), 0 12px 32px rgba(0,0,0,.14); }
.portada .acciones { justify-content: center; }
/* selector de idioma (en el índice) */
.idiomas { display: flex; flex-wrap: wrap; gap: .4rem; margin: .2rem 0 .6rem; }
.idiomas a, .idiomas span {
  display: inline-flex; align-items: center; justify-content: center; min-width: 2.75rem; min-height: 2.5rem;
  padding: 0 .6rem; border-radius: .6rem; border: 1px solid var(--linea); font: 600 .85rem var(--sans);
  color: var(--tinta); text-decoration: none;
}
.idiomas span { background: var(--acento-suave); border-color: var(--acento); }
.idiomas-portada { justify-content: center; margin: -1rem 0 1.5rem; }

/* aviso de analítica (sólo se muestra con hora europea) */
.aviso {
  position: fixed; left: 1rem; right: 1rem; bottom: 1rem; z-index: 60; max-width: 34rem; margin: 0 auto;
  display: flex; flex-wrap: wrap; align-items: center; gap: .5rem .75rem; padding: .8rem 1rem;
  background: var(--papel); color: var(--tinta); border: 1px solid var(--linea); border-radius: .75rem;
  box-shadow: 0 6px 24px rgba(0,0,0,.18); font-family: var(--sans); font-size: .9rem; line-height: 1.4;
}
.aviso[hidden] { display: none; }
.aviso p { margin: 0; flex: 1 1 16rem; }
.aviso button {
  font: inherit; padding: .45rem .9rem; border-radius: .5rem; cursor: pointer;
  border: 1px solid var(--linea); background: transparent; color: var(--tinta);
}
.aviso button[data-analitica="si"] { background: var(--acento); border-color: var(--acento); color: #fff; }