/* ===== A · EL TRATADO — editorial cientifico ===== */
:root{
  --paper:#F1ECE1; --ink:#221D18; --muted:#6E655A; --line:#DDD4C5;
  --ember:#B4331A; --data:#1F5673; --band:#211C17; --band-ink:#F1ECE1;
  --measure:48rem;
}
@media (prefers-color-scheme:dark){
  :root{ --paper:#16120D; --ink:#ECE3D5; --muted:#A99E8D; --line:#2C251C;
    --ember:#E0653A; --data:#7FA9D4; --band:#0E0B07; --band-ink:#ECE3D5; }
}
:root[data-theme="light"]{ --paper:#F1ECE1; --ink:#221D18; --muted:#6E655A; --line:#DDD4C5; --ember:#B4331A; --data:#1F5673; --band:#211C17; --band-ink:#F1ECE1; }
:root[data-theme="dark"]{ --paper:#16120D; --ink:#ECE3D5; --muted:#A99E8D; --line:#2C251C; --ember:#E0653A; --data:#7FA9D4; --band:#0E0B07; --band-ink:#ECE3D5; }
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:"Newsreader",Georgia,serif;font-size:21px;line-height:1.62;
  font-optical-sizing:auto;-webkit-font-smoothing:antialiased;}
img{max-width:100%;height:auto;display:block}
a{color:var(--ember)}
.site{background:var(--band);color:var(--band-ink)}
.mast{max-width:100rem;margin:0 auto;padding:18px 24px;display:flex;align-items:center;gap:18px}
.brand{font-family:"Fraunces",serif;font-weight:800;font-size:26px;letter-spacing:-.01em;color:var(--band-ink);text-decoration:none}
.motto{font-family:"Inter",sans-serif;font-size:11px;letter-spacing:.22em;color:var(--ember);margin-left:auto;font-weight:600}
.tbtn{font-family:"Inter",sans-serif;font-size:11px;letter-spacing:.12em;text-transform:uppercase;background:transparent;color:var(--band-ink);border:1px solid rgba(241,236,225,.35);border-radius:999px;padding:7px 12px;cursor:pointer}
.tbtn-l{display:none}.tbtn-d{display:inline}
:root[data-theme="dark"] .tbtn-l{display:inline}:root[data-theme="dark"] .tbtn-d{display:none}
@media (prefers-color-scheme:dark){.tbtn-l{display:inline}.tbtn-d{display:none}}
:root[data-theme="light"] .tbtn-l{display:none}:root[data-theme="light"] .tbtn-d{display:inline}
.lede{max-width:100rem;margin:34px auto 8px;padding:0 24px;font-family:"Fraunces",serif;font-size:30px;line-height:1.2;font-weight:500;color:var(--ink)}
.controls{max-width:100rem;margin:0 auto;padding:14px 24px 6px;display:flex;flex-wrap:wrap;gap:14px 22px;align-items:center;border-bottom:1px solid var(--line)}
.search{flex:1 1 260px;background:transparent;border:1px solid var(--line);border-radius:8px;padding:10px 12px;font:inherit;font-size:16px;color:var(--ink)}
.ctl{display:flex;align-items:center;gap:6px}
.ctl-lbl{font-family:"Inter",sans-serif;font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-right:2px}
.pill{font-family:"Inter",sans-serif;font-size:12.5px;border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:999px;padding:6px 12px;cursor:pointer}
.pill.is-on{background:var(--ember);border-color:var(--ember);color:#fff}
.pill-n{opacity:.55;font-variant-numeric:tabular-nums;font-size:.92em}
.pill-n::before{content:"("}.pill-n::after{content:")"}
.count{font-family:"Inter",sans-serif;font-size:11px;color:var(--muted);margin-left:auto;letter-spacing:.04em}
.grid{max-width:100rem;margin:0 auto;padding:28px 24px 60px;display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:34px 28px}
.card{text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:13px}
.card-media{display:block;aspect-ratio:16/10;overflow:hidden;border:1px solid var(--line);background:var(--band)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
/* Portadas que perderian 30% o mas al recortarse: se muestran enteras sobre el
   papel, como una lamina montada. Mejor completa y chica que media imagen grande. */
/* Imagenes con fondo transparente: se dibujaron sobre papel blanco y llevan letras
   negras. Sobre el fondo oscuro de la tarjeta, o sobre el papel del modo noche,
   desaparecen. Por eso llevan un fondo claro fijo, no el del tema. */
.card-media--alfa{background:#F1ECE1}
.post-body figure.alfa{background:#F1ECE1}
/* La imagen entera y nitida al centro; detras, una copia ampliada y desenfocada
   que llena la tarjeta. Ni se deforma ni se corta. */
.card-media--entera{background:var(--paper);position:relative}
.card-media--entera img{object-fit:contain;padding:9px;position:relative;z-index:1}
.card-media--entera img.fondo{position:absolute;inset:0;padding:0;z-index:0;
  object-fit:cover;filter:blur(18px) saturate(1.25);transform:scale(1.25);opacity:.55}
.card:hover .card-media--entera img{transform:scale(1.02)}
.card:hover .card-media--entera img.fondo{transform:scale(1.25)}
.card-media--alfa img.fondo{display:none}
.card:hover .card-media img{transform:scale(1.04)}
.card-media--empty{display:grid;place-items:center;background:linear-gradient(135deg,var(--band),var(--ember))}
.card-media--empty span{font-family:"Fraunces",serif;font-size:54px;color:#fff;opacity:.85}
.card-body{display:flex;flex-direction:column;gap:8px}
.chip{align-self:flex-start;font-family:"Inter",sans-serif;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--data);font-weight:600}
.card-title{font-family:"Fraunces",serif;font-weight:600;font-size:22px;line-height:1.14;text-wrap:balance}
.card-meta{font-family:"Inter",sans-serif;font-size:12px;color:var(--muted);letter-spacing:.03em;font-variant-numeric:tabular-nums}
.card-excerpt{font-size:15.5px;line-height:1.5;color:var(--muted)}
/* article */
.back{display:inline-block;max-width:var(--measure);margin:26px auto 0;padding:0 24px;width:100%;font-family:"Inter",sans-serif;font-size:13px;color:var(--muted);text-decoration:none}
.post{max-width:64rem;margin:0 auto;padding:10px 24px 50px}
.post-head{max-width:var(--measure);margin:0 auto 34px;padding:20px 0 26px;border-bottom:1px solid var(--line)}
.kicker{font-family:"Inter",sans-serif;font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--data);font-weight:600}
.post h1{font-family:"Fraunces",serif;font-weight:800;font-size:clamp(34px,5vw,52px);line-height:1.03;letter-spacing:-.015em;margin:.35em 0 .3em;text-wrap:balance}
/* el titulo baja de cuerpo cuando es largo, para que no se coma la pagina */
.post h1.t-corto{font-size:clamp(34px,5vw,52px)}
.post h1.t-medio{font-size:clamp(30px,4.4vw,44px);line-height:1.06}
.post h1.t-largo{font-size:clamp(26px,3.8vw,36px);line-height:1.12}
.post-meta{font-family:"Inter",sans-serif;font-size:12.5px;color:var(--muted);letter-spacing:.04em;font-variant-numeric:tabular-nums;margin:0}
.post-body{counter-reset:figura;display:grid;grid-template-columns:1fr min(var(--measure),100%) 1fr;column-gap:0}
.post-body>*{grid-column:2;min-width:0}
.post-body h2{font-family:"Fraunces",serif;font-weight:700;font-size:30px;line-height:1.1;margin:1.8em 0 .5em;color:var(--ink)}
.post-body p{margin:0 0 1.15em;text-align:justify;hyphens:auto;-webkit-hyphens:auto;hyphenate-limit-chars:6 3 3;text-wrap:pretty}
/* el video de YouTube ocupa el ancho de la columna, sin marco de figura */
.post-body figure.video{grid-column:2;width:100%;border:0;background:none;margin:1.9em 0;counter-increment:none}
.post-body figure.video::after{content:none}
.post-body figure.video iframe{display:block;width:100%;aspect-ratio:16/9;height:auto;border:1px solid var(--line);background:#000}
/* Miniatura con boton de play: el reproductor se carga recien al hacer clic */
.post-body figure.video .yt{display:block;position:relative;width:100%;aspect-ratio:16/9;padding:0;
  border:1px solid var(--line);background:#000;cursor:pointer;overflow:hidden}
.post-body figure.video .yt img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s,opacity .3s}
.post-body figure.video .yt:hover img{transform:scale(1.03);opacity:.82}
.post-body figure.video .yt-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:74px;height:52px;border-radius:12px;background:rgba(20,17,13,.72);transition:background .25s}
.post-body figure.video .yt-play::after{content:"";position:absolute;top:50%;left:52%;transform:translate(-50%,-50%);
  border-style:solid;border-width:11px 0 11px 19px;border-color:transparent transparent transparent #fff}
.post-body figure.video .yt:hover .yt-play{background:var(--ember)}
.post-body figure.video .yt:focus-visible{outline:2px solid var(--data);outline-offset:3px}
/* Un parrafo que era SOLO una direccion pegada. Se muestra como un boton con el
   nombre del destino; la direccion completa sigue viva en el href. */
.post-body p.enlace-suelto{margin:1.9em 0;text-align:left}
.post-body p.enlace-suelto a{display:inline-flex;align-items:center;gap:11px;max-width:100%;
  border:1px solid var(--line);padding:12px 18px;background:none;cursor:pointer;
  font-family:"Inter",system-ui,sans-serif;font-size:15px;line-height:1.3;
  color:var(--ink);text-decoration:none;transition:border-color .2s,color .2s}
.post-body p.enlace-suelto a:hover{border-color:var(--ember);color:var(--ember)}
.post-body p.enlace-suelto a::before{content:"";flex:none;width:0;height:0;border-style:solid;
  border-width:6px 0 6px 10px;border-color:transparent transparent transparent var(--ember)}
.post-body hr{border:0;border-top:1px solid var(--line);width:38%;margin:2.4em auto}
.post-body blockquote{margin:1.5em 0;padding:2px 0 2px 22px;border-left:3px solid var(--ember)}
.post-body blockquote p{margin:0;font-family:"Newsreader",serif;font-style:italic;color:var(--ink);text-align:left;hyphens:none}
.post-body p:first-of-type::first-letter{font-family:"Fraunces",serif;font-weight:800;float:left;font-size:3.4em;line-height:.82;padding:6px 10px 0 0;color:var(--ember)}
.post-body figure{counter-increment:figura;grid-column:1/-1;justify-self:center;width:fit-content;max-width:100%;margin:1.9em auto;border:1px solid var(--line);background:var(--paper)}
.post-body figure img{display:block;max-width:100%;height:auto;margin:0 auto}
.post-body figure::after{content:"FIGURA " counter(figura);display:block;font-family:"Inter",sans-serif;font-size:10.5px;letter-spacing:.16em;color:var(--muted);padding:9px 12px;border-top:1px solid var(--line)}
.site-foot{border-top:1px solid var(--line);margin-top:20px;padding:34px 24px;display:flex;flex-direction:column;gap:8px;align-items:center;text-align:center;font-family:"Inter",sans-serif;font-size:12px;color:var(--muted)}
.site-foot .motto{margin:0;color:var(--ember);letter-spacing:.2em}
/* pantallas grandes: texto del articulo un poco mayor para que la columna no se sienta vacia */
@media (min-width:1200px){ .post-body{font-size:22px} }
/* controles: fila de busqueda + al azar, y fila de tematicas */
.ctl-line{flex:1 1 100%;display:flex;gap:12px;align-items:center}
.ctl-line .search{flex:1 1 auto}
.pill-rand{border-color:var(--ember);color:var(--ember);white-space:nowrap;font-weight:600}
.pill-rand:hover{background:var(--ember);color:#fff}
.ctl-themes{flex:1 1 100%;flex-wrap:wrap;align-items:baseline}
.filtros{display:flex;flex-wrap:wrap;gap:14px 22px;width:100%;align-items:center}
.filtros-toggle{display:none;border-color:var(--data);color:var(--data);font-weight:600}
.theme-head{max-width:80rem;margin:22px auto 2px;padding:0 24px;text-align:center}
.theme-cover{width:100%;aspect-ratio:16/6;max-height:420px;object-fit:cover;border-radius:16px;border:1px solid var(--line);display:block;margin:0 auto 18px}
.theme-intro{max-width:46rem;margin:0 auto;font-family:"Newsreader",serif;font-style:italic;font-size:19px;line-height:1.55;color:var(--ink);text-wrap:pretty}
@media (max-width:640px){
  body{font-size:18px}
  /* en celular la columna es muy angosta: justificar abre huecos, mejor bandera */
  .post-body p{text-align:left;hyphens:none;-webkit-hyphens:none}
  .lede{font-size:20px;line-height:1.25;margin:16px auto 2px}
  .mast{gap:10px;padding:14px 20px}
  .motto{display:none}
  .mast .tbtn{margin-left:auto}
  .brand{font-size:21px}
  .controls{gap:10px 0;padding:12px 20px 6px}
  .ctl-line{flex-wrap:wrap;gap:9px}
  .ctl-line .search{flex:1 1 100%}
  .pill-rand,.filtros-toggle{flex:1 1 auto;text-align:center}
  .filtros-toggle{display:inline-block}
  .filtros{display:none;flex-direction:column;gap:12px;width:100%;margin-top:2px}
  .filtros.open{display:flex}
  .ctl{width:100%;flex-wrap:wrap}
  .count{margin:2px 0 0}
  .grid{padding:16px 20px 50px}
  .theme-head{padding:0 16px}
}

/* Navegacion entre partes de una serie (al final del articulo) */
.serie-nav{max-width:var(--measure);margin:3.5rem auto 0;padding:1.5rem 24px 0;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:.7rem;font-family:"Inter",sans-serif}
.serie-nav .serie-nombre{margin:0;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--data);font-weight:600}
.serie-nav a{text-decoration:none}
.serie-nav a:hover{text-decoration:underline}
.serie-nav .serie-prev{font-size:13px;color:var(--muted)}
.serie-nav .serie-next{font-size:16px;font-weight:600;color:var(--ember)}
.serie-nav .serie-fin{font-size:14px;color:var(--muted);font-style:italic}