/* PAES? — la estética de Make Me Crazy, un poco más seria. */
:root{
  color-scheme:dark;
  --neon:#39ff88; --hot:#ff2e88; --sun:#ffd21e; --cy:#22d3ee; --pur:#a855f7;
  --ink:#12101c; --card1:rgba(34,28,50,.96); --card2:rgba(20,16,32,.96);
  --papel:#fbfaf6; --tinta:#1b1826; --borde:#000; --suave:#b9b3cc;
  --c:var(--cy);                     /* color de la prueba que se está viendo */
}
*{box-sizing:border-box}
html,body{min-height:100%;margin:0}
body{
  color:#fff; font-family:"Segoe UI",system-ui,-apple-system,Roboto,sans-serif; font-size:16px; line-height:1.45;
  background:radial-gradient(1200px 700px at 80% -10%,rgba(168,85,247,.20),transparent 60%),
             radial-gradient(900px 600px at -10% 110%,rgba(34,211,238,.14),transparent 60%),var(--ink);
  background-attachment:fixed; overflow-x:hidden; -webkit-tap-highlight-color:transparent;
}
h1,h2,h3,.tit{font-family:Impact,"Arial Black",Haettenschweiler,sans-serif;letter-spacing:1px;font-weight:400;margin:0}
h1{font-size:44px;line-height:1} h2{font-size:26px} h3{font-size:19px}
a{color:var(--cy)}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px}
/* solo para lector de pantalla */
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}
select option{background:#0d0b16;color:#fff}

/* fórmulas flotando de fondo */
#fondo{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
#fondo span{position:absolute;color:#fff;opacity:.055;font-family:Georgia,"Times New Roman",serif;font-style:italic;white-space:nowrap;
  animation:flota 38s linear infinite}
body.leyendo #fondo span{animation-play-state:paused}
@keyframes flota{from{transform:translateY(8vh) rotate(var(--r,0deg))}to{transform:translateY(-118vh) rotate(var(--r,0deg))}}

#app{position:relative;z-index:1;max-width:980px;margin:0 auto;padding:16px 14px 90px;padding-top:max(16px,env(safe-area-inset-top))}
.cargando{text-align:center;color:var(--suave);padding:60px 0}

.card{background:linear-gradient(180deg,var(--card1),var(--card2));border:3px solid var(--borde);border-radius:18px;
  padding:16px;box-shadow:0 6px 0 rgba(0,0,0,.55);margin:0 0 14px}
.fila{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.entre{justify-content:space-between}
.crece{flex:1 1 auto;min-width:0}
.chico{font-size:14px;color:var(--suave)}
.enlaces a{display:inline-flex;align-items:center;min-height:44px;padding:0 8px}
.centro{text-align:center}
.oculto{display:none!important}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 18px;border:3px solid var(--borde);
  border-radius:14px;background:var(--c);color:#06121a;font-family:Impact,"Arial Black",sans-serif;font-size:18px;letter-spacing:1px;
  cursor:pointer;box-shadow:0 5px 0 rgba(0,0,0,.6);text-decoration:none;transition:transform .08s,box-shadow .08s}
.btn:active{transform:translateY(4px);box-shadow:0 1px 0 rgba(0,0,0,.6)}
.btn.sec{background:#2b2540;color:#fff}
.btn.hot{background:var(--hot)} .btn.sun{background:var(--sun)} .btn.neon{background:var(--neon)}
.btn.ancho{width:100%}
.btn.mini{min-height:44px;padding:6px 12px;font-size:15px}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.link{background:none;border:0;color:var(--cy);text-decoration:underline;cursor:pointer;min-height:44px;padding:8px}

label{display:block;font-size:14px;color:var(--suave);margin:10px 0 4px}
input[type=text],input[type=password],select,textarea{width:100%;min-height:48px;padding:10px 12px;border-radius:12px;border:3px solid var(--borde);
  background:#0d0b16;color:#fff}
.error{color:#ff8fb8;min-height:22px;margin:8px 0 0;font-size:14px}

/* entrada */
.logo{font-size:76px;line-height:.9;color:var(--sun);text-shadow:4px 4px 0 #000,-2px -2px 0 var(--hot);transform:rotate(-3deg);display:inline-block}
.lema{color:var(--suave);margin:10px 0 18px}
.tabs{display:flex;gap:8px;margin-bottom:8px}
.tabs button{flex:1;min-height:44px;border-radius:12px;border:3px solid var(--borde);background:#1b1630;color:var(--suave);cursor:pointer;
  font-family:Impact,"Arial Black",sans-serif;letter-spacing:1px}
.tabs button.on{background:var(--c);color:#06121a}

/* lobby */
.cab{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{width:54px;height:54px;border-radius:50%;border:3px solid var(--borde);background:#2b2540;display:grid;place-items:center;font-size:28px;flex:none}
.barra{height:14px;border-radius:8px;background:#0d0b16;border:2px solid var(--borde);overflow:hidden}
.barra i{display:block;height:100%;background:linear-gradient(90deg,var(--c),var(--neon));width:0;transition:width .5s}
.liga{display:inline-block;padding:2px 10px;border-radius:999px;border:2px solid var(--borde);font-family:Impact,"Arial Black",sans-serif;letter-spacing:1px;font-size:13px;color:#06121a}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px}
.prueba{display:block;text-align:left;cursor:pointer;border:3px solid var(--borde);border-radius:18px;padding:14px;color:#fff;
  background:linear-gradient(160deg,color-mix(in srgb,var(--c) 18%,#17132a),#17132a);box-shadow:0 6px 0 rgba(0,0,0,.55);width:100%}
a.prueba,a.modo,a.chip,.nav a{text-decoration:none}
.prueba:active{transform:translateY(4px);box-shadow:0 2px 0 rgba(0,0,0,.55)}
.prueba b{display:block;font-family:Impact,"Arial Black",sans-serif;font-size:22px;letter-spacing:1px;color:var(--c)}
.mision{background:rgba(0,0,0,.35);border:3px solid var(--borde);border-radius:14px;padding:12px}
.mision.ok{border-color:var(--neon);background:rgba(57,255,136,.12)}
.mision b{font-family:Impact,"Arial Black",sans-serif;letter-spacing:1px;color:var(--sun)}
.modos{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.modo{cursor:pointer;text-align:left;border:3px solid var(--borde);border-radius:16px;padding:14px;background:linear-gradient(180deg,var(--card1),var(--card2));color:#fff;box-shadow:0 5px 0 rgba(0,0,0,.55)}
.modo b{display:block;font-family:Impact,"Arial Black",sans-serif;font-size:21px;letter-spacing:1px;color:var(--c)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{min-height:44px;padding:8px 14px;border-radius:999px;border:3px solid var(--borde);background:#1b1630;color:#fff;cursor:pointer}
.chip.on{background:var(--c);color:#06121a;font-weight:700}

/* pregunta */
.reloj{font-family:Impact,"Arial Black",sans-serif;font-size:26px;letter-spacing:2px;color:var(--sun);font-variant-numeric:tabular-nums;padding:0 6px;border-radius:8px}
/* la urgencia se marca invirtiendo colores, a saltos: en ningún momento baja el contraste */
.reloj.poco{color:var(--hot);animation:late .8s steps(1) infinite}
@keyframes late{50%{background:var(--hot);color:#06121a}}
.fuente{display:inline-block;font-size:14px;color:#06121a;background:var(--c);border:2px solid var(--borde);border-radius:999px;padding:3px 10px;font-weight:700}
.dos{display:block}
.papel{color-scheme:light;background:var(--papel);color:var(--tinta);border:3px solid var(--borde);border-radius:16px;padding:16px;font-size:17px;line-height:1.55;
  box-shadow:0 6px 0 rgba(0,0,0,.55);overflow-wrap:anywhere}
.papel table{border-collapse:collapse;margin:10px 0;max-width:100%;display:block;overflow-x:auto}
.papel th,.papel td{border:1.5px solid #5a556b;padding:6px 10px;text-align:center}
.papel img{display:block;max-width:100%;height:auto;margin:12px auto}
.alt img{max-width:100%;height:auto;display:block}
.papel img.fig{max-height:60vh}
.papel .katex{font-size:1.08em}
.papel .katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}
.texto{max-height:42vh;overflow:auto;margin-bottom:12px;font-family:Georgia,"Times New Roman",serif}
.texto.cerrado{max-height:0;padding-top:0;padding-bottom:0;border-width:0;overflow:hidden;margin:0;visibility:hidden}
.alts{display:grid;gap:10px;margin:14px 0}
.alt{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;min-height:52px;padding:12px 14px;border-radius:14px;border:3px solid var(--borde);
  background:var(--papel);color:var(--tinta);cursor:pointer;font-size:17px;box-shadow:0 4px 0 rgba(0,0,0,.5)}
.alt .letra{flex:none;width:30px;height:30px;border-radius:50%;border:2px solid var(--tinta);display:grid;place-items:center;font-weight:800}
.alt .marca{flex:none;font-size:22px;line-height:30px;font-weight:800}
/* marcada: aro del color de la prueba y letra rellena (no depende del color); el aro va en box-shadow para no tapar el foco */
.alt.marcada{box-shadow:0 0 0 4px var(--c)} .alt.marcada .letra{background:var(--tinta);color:#fff}
.alt:focus-visible{outline-offset:6px}
.alt.bien{background:#d6ffe6;border-color:#0a7a38} .alt.bien .letra{background:#0a7a38;color:#fff;border-color:#0a7a38} .alt.bien .marca{color:#0a7a38}
.alt.mal{background:#ffdbe8;border-color:#b3134f} .alt.mal .letra{background:#b3134f;color:#fff;border-color:#b3134f} .alt.mal .marca{color:#b3134f}
.alt.fuera{opacity:.6;text-decoration:line-through;pointer-events:none}
.alt[disabled]{cursor:default}
.ayudas{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.pista{background:rgba(255,210,30,.12);border:2px dashed var(--sun);border-radius:12px;padding:10px 12px;margin:8px 0}
.expl{border-left:6px solid var(--neon)}
.expl.fallo{border-left-color:var(--hot)}
.expl h3{color:var(--neon)} .expl.fallo h3{color:#ff8fb8}
.expl dt{font-weight:800;margin-top:8px} .expl dd{margin:0 0 0 0;color:#e6e2f2}
.nav{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:6px;margin:10px 0}
.nav button,.nav a{display:grid;grid-auto-flow:column;gap:2px;place-items:center;justify-content:center;min-height:44px;border-radius:10px;border:2px solid var(--borde);background:#1b1630;color:#fff;cursor:pointer}
.nav button.resp{background:var(--c);color:#06121a;font-weight:800} .nav button.resp::after{content:"✓";font-size:11px;line-height:1}
/* "estás aquí" es un aro por dentro (blanco y negro: se ve sobre cualquier color) y no se confunde con el foco, que va por fuera */
.nav .aqui{box-shadow:inset 0 0 0 3px #fff,inset 0 0 0 5px #000}
.nav a.ok{background:#0a7a38} .nav a.ko{background:#b3134f}

/* listas */
.lista{list-style:none;margin:0;padding:0}
.lista li{display:flex;gap:10px;align-items:center;padding:10px 4px;border-bottom:1px solid rgba(255,255,255,.08)}
.lista .pos{width:34px;text-align:center;font-family:Impact,"Arial Black",sans-serif;font-size:20px;color:var(--sun);flex:none}
.medallas{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.medalla{border:3px solid var(--borde);border-radius:14px;padding:10px;text-align:center;background:#1b1630}
/* no ganada: se apaga solo el dibujo; el nombre y cómo ganarla se siguen leyendo */
.medalla:not(.on) .e{opacity:.4;filter:grayscale(1)}
.medalla.on{background:linear-gradient(180deg,#3a2f12,#1b1630);border-color:var(--sun)}
.medalla .e{font-size:34px}
details{border:3px solid var(--borde);border-radius:14px;background:#191430;margin-bottom:10px}
details summary{cursor:pointer;padding:12px 14px;font-weight:700;min-height:48px;list-style:none;display:flex;justify-content:space-between;gap:10px;align-items:center}
details summary::-webkit-details-marker{display:none}
details .dentro{padding:0 14px 14px}
table.datos{width:100%;border-collapse:collapse;font-size:14px}
table.datos th,table.datos td{padding:8px 6px;border-bottom:1px solid rgba(255,255,255,.1);text-align:left;vertical-align:top}
.scroll{overflow-x:auto}
.puntaje{font-family:Impact,"Arial Black",sans-serif;font-size:72px;line-height:1;color:var(--sun);text-shadow:4px 4px 0 #000}

#aviso{position:fixed;left:50%;bottom:18px;transform:translateX(-50%) translateY(calc(100% + 60px));z-index:20;background:#000;color:#fff;border:3px solid var(--sun);
  border-radius:14px;padding:10px 16px;max-width:92vw;transition:transform .25s;text-align:center}
#aviso.ver{transform:translateX(-50%) translateY(0)}
#aviso:empty{border:0;padding:0}      /* sigue en el árbol de accesibilidad (región viva), pero sin caja que se vea */
.resultado{margin:0 0 12px;padding:10px 14px;border-radius:12px;font-weight:700;background:#000;color:var(--neon);border:2px solid var(--neon)}
.resultado.fallo{color:#ff8fb8;border-color:var(--hot)}
.salta{animation:salta .45s}
@keyframes salta{0%{transform:scale(.9)}60%{transform:scale(1.06)}100%{transform:scale(1)}}
.tiembla{animation:tiembla .35s}
@keyframes tiembla{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
#testout{position:fixed;top:0;left:0;z-index:99;background:#000;color:#0f0;padding:8px;max-width:96vw;max-height:60vh;overflow:auto;white-space:pre-wrap;margin:0;font-size:12px}

@media (min-width:900px){
  .dos.con-texto{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
  .dos.con-texto .texto{max-height:78vh;position:sticky;top:12px;margin:0}
  .dos.con-texto .texto.cerrado{max-height:78vh;padding:16px;border-width:3px;overflow:auto;visibility:visible}
  .plegar{display:none!important}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}
@media print{
  body{background:#fff;color:#000} #fondo,#aviso,.noprint{display:none!important}
  .card{box-shadow:none;border-color:#000;background:#fff;color:#000}
}