:root{
  --bg:#050914;
  --panel:#0b1428;
  --panel-2:#101d36;
  --text:#eaf6ff;
  --muted:#a8bad2;
  --brand:#149df2;
  --brand-2:#5bd7ff;
  --line:rgba(255,255,255,.12);
  --ok:#4ade80;
  --bad:#fb7185;
  --shadow:0 24px 80px rgba(0,0,0,.38);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,Segoe UI,Roboto,Arial,sans-serif;
  color:var(--text);
  background:radial-gradient(circle at top left,rgba(20,157,242,.32),transparent 35%),linear-gradient(135deg,#050914 0%,#07162c 50%,#02101f 100%);
  min-height:100vh;
}
.bg-grid{
  position:fixed; inset:0; pointer-events:none; opacity:.22;
  background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:42px 42px;
  mask-image:linear-gradient(to bottom,black,transparent 80%);
}
a{color:inherit;text-decoration:none}
.topbar{
  position:sticky; top:0; z-index:10;
  display:flex; align-items:center; justify-content:space-between;
  padding:16px clamp(18px,5vw,72px);
  background:rgba(5,9,20,.78); backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.08em}
.brand img{width:38px;height:38px;object-fit:contain}
nav{display:flex;gap:18px;color:var(--muted);font-size:.95rem}
nav a:hover{color:var(--brand-2)}
main{position:relative;z-index:1}
.hero{
  min-height:calc(100vh - 72px);
  display:grid; grid-template-columns:1.08fr .92fr; gap:44px;
  align-items:center;
  padding:70px clamp(18px,5vw,72px) 40px;
}
.eyebrow{color:var(--brand-2);font-weight:800;text-transform:uppercase;letter-spacing:.16em;font-size:.78rem;margin:0 0 12px}
h1{font-size:clamp(2.4rem,7vw,5.8rem);line-height:.96;margin:0 0 22px;letter-spacing:-.06em}
h1 span{color:var(--brand-2)}
.lead{font-size:clamp(1.05rem,2vw,1.32rem);line-height:1.65;color:var(--muted);max-width:760px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}
.btn{border:1px solid var(--line);border-radius:999px;padding:14px 22px;font-weight:800;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:.2s ease;background:transparent;color:var(--text)}
.btn:hover{transform:translateY(-2px);border-color:rgba(91,215,255,.55)}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#03101f;border:0;box-shadow:0 18px 38px rgba(20,157,242,.28)}
.btn.ghost{background:rgba(255,255,255,.05)}
.mini-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:34px;max-width:650px}
.mini-stats article{padding:18px;border:1px solid var(--line);background:rgba(255,255,255,.045);border-radius:20px}
.mini-stats strong{display:block;color:var(--brand-2);font-size:1.25rem}.mini-stats span{color:var(--muted)}
.hero-card{position:relative;min-height:480px;border:1px solid var(--line);border-radius:38px;background:linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.025));box-shadow:var(--shadow);display:grid;place-items:center;overflow:hidden}
.hero-card:before{content:"";position:absolute;width:360px;height:360px;border-radius:50%;background:rgba(20,157,242,.18);filter:blur(28px)}
.main-logo{width:min(78%,520px);position:relative;z-index:1;filter:drop-shadow(0 20px 45px rgba(0,0,0,.45))}
.shield-orbit{position:absolute;right:28px;bottom:28px;width:112px;height:112px;border:1px solid var(--line);border-radius:30px;background:rgba(5,9,20,.72);display:grid;place-items:center}
.shield-orbit img{width:76px}
.section{padding:78px clamp(18px,5vw,72px);border-top:1px solid var(--line)}
.two-col{display:grid;grid-template-columns:.9fr 1.1fr;gap:34px;align-items:start}.two-col h2,.section-title h2,.qr-section h2{font-size:clamp(2rem,4vw,3.4rem);letter-spacing:-.04em;margin:0 0 16px}.two-col p,.section-title p,.qr-section p{color:var(--muted);line-height:1.7}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.info-card,.form-card,.qr-card,.material-card{border:1px solid var(--line);border-radius:26px;background:rgba(255,255,255,.055);box-shadow:0 16px 42px rgba(0,0,0,.2)}.info-card{padding:24px}.info-card h3{margin:0 0 10px;color:var(--brand-2)}.info-card p{color:var(--muted);line-height:1.6}.section-title{text-align:center;max-width:760px;margin:0 auto 32px}.form-section{background:rgba(255,255,255,.025)}.form-card{max-width:980px;margin:0 auto;padding:28px}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}label{display:grid;gap:8px;font-weight:750;color:var(--text);margin-bottom:18px}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:16px;background:rgba(3,8,18,.72);color:var(--text);padding:14px 15px;font:inherit;outline:none}input:focus,select:focus,textarea:focus{border-color:var(--brand-2);box-shadow:0 0 0 4px rgba(91,215,255,.12)}textarea{resize:vertical}.scale-block{border:1px solid var(--line);border-radius:22px;padding:20px;margin:8px 0 20px;background:rgba(0,0,0,.14)}.scale-block h3{margin:0 0 6px}.scale-block p{margin:0 0 18px;color:var(--muted)}.scale-list label{grid-template-columns:1fr 190px 34px;align-items:center;gap:12px;margin-bottom:14px}.scale-list small{display:block;color:var(--muted);font-weight:500;margin-top:4px}input[type=range]{accent-color:var(--brand);padding:0}output{color:var(--brand-2);font-weight:900}.checks{display:grid;gap:8px;margin:12px 0 22px}.checks label{display:flex;align-items:center;gap:10px;margin:0;color:var(--muted);font-weight:600}.checks input{width:auto}.submit{width:100%;border-radius:18px}.form-msg{margin:16px 0 0;text-align:center;font-weight:800}.form-msg.ok{color:var(--ok)}.form-msg.bad{color:var(--bad)}.qr-section{display:grid;grid-template-columns:1fr 360px;gap:32px;align-items:center}.qr-card{padding:22px;text-align:center;background:#fff;color:#0b1428}.qr-card #qrcode{display:grid;place-items:center;margin-bottom:14px}.qr-card img{margin:auto}.qr-card p{font-size:.82rem;color:#475569;word-break:break-all}.qr-print{margin-top:12px;width:100%}.material-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;max-width:920px;margin:0 auto}.material-card{padding:24px;transition:.2s ease}.material-card:hover{transform:translateY(-3px);border-color:rgba(91,215,255,.5)}.material-card span{display:inline-flex;background:rgba(20,157,242,.16);color:var(--brand-2);border:1px solid rgba(91,215,255,.25);padding:6px 10px;border-radius:999px;font-size:.78rem;font-weight:900}.material-card h3{margin:16px 0 10px}.material-card p{color:var(--muted);line-height:1.55}footer{position:relative;z-index:1;padding:34px;text-align:center;color:var(--muted);border-top:1px solid var(--line)}footer img{max-width:240px;filter:invert(1);opacity:.8;margin-bottom:8px}
@media(max-width:880px){nav{display:none}.hero,.two-col,.qr-section{grid-template-columns:1fr}.hero-card{min-height:330px}.cards,.material-grid,.form-grid{grid-template-columns:1fr}.mini-stats{grid-template-columns:1fr}.scale-list label{grid-template-columns:1fr}.qr-card{max-width:360px}.section{padding:56px 18px}}
@media print{body{background:#fff;color:#000}.topbar,.hero,.two-col,.form-section,.materials,footer,.bg-grid{display:none}.section{border:0}.qr-section{display:block;padding:20px}.qr-section>div:first-child{display:none}.qr-card{box-shadow:none;border:0;margin:auto}.qr-card p{color:#000}.qr-print{display:none}}

/* Desafíos interactivos */
.compact-hero{min-height:auto;padding-top:7rem;padding-bottom:3rem}
.small-card{min-height:260px}
.notice{margin-top:1rem;padding:1rem 1.1rem;border-radius:18px;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.06);color:var(--muted)}
.notice.ok{border-color:rgba(46,213,115,.35);background:rgba(46,213,115,.09);color:#dfffea}
.notice.warn{border-color:rgba(255,193,7,.35);background:rgba(255,193,7,.08);color:#fff3cd}
.challenge-section{padding-top:4rem}
.challenge-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.4rem;align-items:start}
.challenge-card{border:1px solid rgba(255,255,255,.12);background:linear-gradient(180deg,rgba(255,255,255,.08),rgba(255,255,255,.04));box-shadow:0 24px 80px rgba(0,0,0,.22);border-radius:26px;padding:1.4rem;display:flex;flex-direction:column;gap:1rem}
.challenge-card h3{margin:0;color:var(--white)}
.challenge-img{width:100%;height:auto;max-height:620px;object-fit:contain;background:#fff;border-radius:18px;padding:.7rem;border:1px solid rgba(255,255,255,.12);display:block}
.cipher-box{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;background:rgba(0,0,0,.32);border:1px solid rgba(0,174,255,.22);border-radius:20px;padding:1.1rem;color:#d8f4ff;line-height:1.65;overflow:auto}
.registro-guardado{margin-top:1rem;padding:1rem;border-radius:18px;border:1px solid rgba(0,174,255,.25);background:rgba(0,174,255,.08);color:var(--white)}
.btn.small{display:inline-flex;margin-top:.8rem;padding:.65rem 1rem;font-size:.9rem}
.material-card.highlight{border-color:rgba(0,174,255,.4);background:linear-gradient(180deg,rgba(0,174,255,.18),rgba(255,255,255,.05))}
@media(max-width:900px){.challenge-grid{grid-template-columns:1fr}.challenge-img{max-height:460px}.compact-hero{padding-top:6rem}}


/* Ajuste final para que los desafíos visuales se lean derechos y completos */
.challenge-card label{margin-bottom:.25rem}
.challenge-card input,.challenge-card textarea{background:rgba(3,8,18,.82)}
@media(min-width:1200px){
  .challenge-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .challenge-img{max-height:680px;}
}
@media(max-width:1199px){
  .challenge-grid{grid-template-columns:1fr;}
  .challenge-img{max-height:none;}
}


/* Materiales: versión final sin enlaces a PDF */
.material-grid.single{grid-template-columns:minmax(280px,620px);justify-content:center;max-width:720px}
.challenge-link-card{min-height:250px;display:flex;flex-direction:column;justify-content:center}
.card-cta{display:inline-flex;margin-top:12px;color:var(--brand-2);font-size:1.05rem}

/* Corrección v7: imágenes de desafíos en tamaño final */
.challenge-section{
  padding-top:3.2rem;
}
.challenge-grid{
  grid-template-columns:repeat(2,minmax(320px,1fr));
  gap:1.6rem;
}
.challenge-card{
  max-width:760px;
  width:100%;
  margin:0 auto;
}
.challenge-img{
  width:100%;
  max-width:680px;
  max-height:430px;
  margin:0 auto;
  object-fit:contain;
  object-position:center;
}
@media(max-width:1199px){
  .challenge-grid{
    grid-template-columns:1fr;
  }
  .challenge-card{
    max-width:780px;
  }
  .challenge-img{
    max-width:720px;
    max-height:440px;
  }
}
@media(max-width:680px){
  .challenge-card{
    padding:1rem;
  }
  .challenge-img{
    max-height:300px;
    padding:.45rem;
    border-radius:14px;
  }
}

/* v8: charlas, participación sin registro y panel de resultados */
.mini-stats{grid-template-columns:repeat(4,1fr)}
.talks-grid{max-width:1120px;margin:0 auto}.talks-section{background:rgba(255,255,255,.018)}
.participant-card{border:1px solid var(--line);background:rgba(255,255,255,.06);border-radius:24px;padding:1.1rem;max-width:620px;margin-top:1.4rem;box-shadow:0 16px 38px rgba(0,0,0,.18)}
.participant-card label{margin-bottom:.8rem}.participant-card .btn{width:100%}
.panel-hero{grid-template-columns:1.15fr .85fr}.panel-controls{display:grid;grid-template-columns:minmax(220px,320px) auto;gap:1rem;align-items:end;margin-top:1.5rem}.panel-controls label{margin:0}.panel-section{padding-top:3.5rem}.panel-grid{display:grid;grid-template-columns:repeat(2,minmax(280px,1fr));gap:1.3rem}.panel-card,.winner-box,.answer-card,.table-wrap{border:1px solid var(--line);border-radius:26px;background:rgba(255,255,255,.055);box-shadow:0 16px 42px rgba(0,0,0,.2)}.panel-card{padding:1.4rem}.panel-card h2{font-size:clamp(1.55rem,3vw,2.4rem);margin:.2rem 0 .6rem}.panel-card p{color:var(--muted);line-height:1.55}.winner-box{margin-top:1rem;padding:1rem;min-height:110px}.winner-box h3{font-size:1.45rem;color:var(--brand-2);margin:.2rem 0}.table-wrap{overflow:auto}.data-table{width:100%;border-collapse:collapse;min-width:680px}.data-table th,.data-table td{padding:1rem;border-bottom:1px solid var(--line);text-align:left}.data-table th{color:var(--brand-2);font-size:.88rem;text-transform:uppercase;letter-spacing:.08em}.data-table tr:last-child td{border-bottom:0}.answers-list{display:grid;gap:1rem;max-width:1100px;margin:0 auto}.answer-card{padding:1.1rem}.answer-card div:first-child{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}.answer-card span{color:var(--brand-2);font-weight:800}.answer-card p{color:var(--muted);line-height:1.5}.answer-actions{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.8rem}
footer a{color:var(--brand-2);font-weight:800}
@media(max-width:880px){.mini-stats{grid-template-columns:1fr}.panel-hero,.panel-grid,.panel-controls{grid-template-columns:1fr}.talks-grid{grid-template-columns:1fr}}


/* v9: subir el contenido de la página Desafíos */
.compact-hero{
  padding-top:3.2rem !important;
  padding-bottom:1.8rem !important;
}
.compact-hero h1{
  margin-bottom:12px;
}
.compact-hero .lead{
  margin-top:0;
}
.challenge-section{
  padding-top:2rem !important;
}
@media(max-width:880px){
  .compact-hero{
    padding-top:2.4rem !important;
    padding-bottom:1.4rem !important;
  }
}


/* v10: agregar Sorteo como quinto eje en la portada */
.mini-stats{grid-template-columns:repeat(5,1fr) !important;}
@media(max-width:1100px){.mini-stats{grid-template-columns:repeat(3,1fr) !important;}}
@media(max-width:680px){.mini-stats{grid-template-columns:1fr !important;}}


/* v13: botón final para volver al inicio desde desafíos */
.challenge-finish-actions{
  max-width:720px;
  margin:2.2rem auto 0;
  padding:1.4rem;
  text-align:center;
  border:1px solid var(--line);
  border-radius:26px;
  background:linear-gradient(180deg,rgba(0,174,255,.14),rgba(255,255,255,.045));
  box-shadow:0 16px 42px rgba(0,0,0,.18);
}
.challenge-finish-actions h3{
  margin:.1rem 0 .45rem;
  font-size:clamp(1.35rem,2.5vw,2rem);
}
.challenge-finish-actions p{
  margin:0 auto 1rem;
  max-width:560px;
  color:var(--muted);
  line-height:1.55;
}
.challenge-finish-actions .btn{
  justify-content:center;
}
@media(max-width:680px){
  .challenge-finish-actions{
    margin-top:1.4rem;
    padding:1rem;
  }
  .challenge-finish-actions .btn{
    width:100%;
  }
}

/* v14: sección Charlas con flyer oficial */
.talks-layout{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:minmax(280px,430px) 1fr;
  gap:1.4rem;
  align-items:stretch;
}
.talks-poster-card{
  border:1px solid var(--line);
  background:rgba(255,255,255,.055);
  border-radius:28px;
  overflow:hidden;
  box-shadow:0 22px 70px rgba(0,0,0,.26);
}
.talks-poster-card img{
  width:100%;
  height:100%;
  min-height:520px;
  object-fit:cover;
  object-position:center;
  display:block;
}
.talks-list{
  display:grid;
  gap:1rem;
}
.talk-card{
  border:1px solid var(--line);
  border-radius:28px;
  padding:1.35rem;
  background:linear-gradient(180deg,rgba(255,255,255,.075),rgba(255,255,255,.035));
  box-shadow:0 16px 46px rgba(0,0,0,.18);
}
.talk-card.featured{
  border-color:rgba(91,215,255,.38);
  background:linear-gradient(180deg,rgba(20,157,242,.17),rgba(255,255,255,.045));
}
.talk-date{
  display:inline-flex;
  align-items:center;
  width:max-content;
  max-width:100%;
  padding:.45rem .7rem;
  border:1px solid rgba(91,215,255,.28);
  border-radius:999px;
  background:rgba(20,157,242,.14);
  color:var(--brand-2);
  font-weight:900;
  font-size:.86rem;
  letter-spacing:.02em;
}
.talk-card h3{
  margin:1rem 0 .55rem;
  font-size:clamp(1.3rem,2.6vw,2.15rem);
  line-height:1.05;
}
.talk-card p{
  margin:0;
  color:var(--muted);
  font-size:1.04rem;
  line-height:1.55;
}
@media(max-width:980px){
  .talks-layout{grid-template-columns:1fr;}
  .talks-poster-card{max-width:520px;margin:0 auto;width:100%;}
  .talks-poster-card img{min-height:auto;}
}
@media(max-width:560px){
  .talk-card{padding:1rem;border-radius:22px;}
  .talk-date{font-size:.78rem;}
}


/* v15: sección Sponsor y popup de contacto */
.topbar nav a[href="#sponsor"]{color:var(--brand-2)}
.sponsor-section{background:rgba(255,255,255,.018)}
.sponsor-layout{display:grid;grid-template-columns:1.15fr .85fr;gap:1.4rem;align-items:stretch;max-width:1180px;margin:0 auto}
.sponsor-card{border:1px solid var(--line);border-radius:28px;background:linear-gradient(180deg,rgba(255,255,255,.075),rgba(255,255,255,.035));box-shadow:0 20px 62px rgba(0,0,0,.22);padding:1.6rem;display:flex;flex-direction:column;justify-content:center}
.sponsor-label{display:inline-flex;width:max-content;margin-bottom:1rem;padding:.48rem .8rem;border-radius:999px;border:1px solid rgba(91,215,255,.32);background:rgba(0,174,255,.12);color:var(--brand-2);font-weight:900;font-size:.8rem;text-transform:uppercase;letter-spacing:.08em}
.main-sponsor img{width:100%;max-width:760px;margin:0 auto 1rem;display:block;filter:drop-shadow(0 12px 28px rgba(0,0,0,.35))}
.main-sponsor p,.sponsor-call p{color:var(--muted);line-height:1.6;margin:.4rem 0 0}
.sponsor-call h3{font-size:clamp(1.7rem,3vw,2.5rem);margin:.2rem 0 .8rem;color:var(--white)}
.sponsor-actions{display:flex;gap:.85rem;flex-wrap:wrap;margin-top:1.3rem}.sponsor-actions .btn{justify-content:center}
.contact-dialog{width:min(920px,calc(100vw - 28px));border:1px solid rgba(91,215,255,.28);border-radius:28px;padding:0;background:transparent;color:var(--text);box-shadow:0 28px 90px rgba(0,0,0,.55)}
.contact-dialog::backdrop{background:rgba(1,6,14,.72);backdrop-filter:blur(8px)}
.contact-form{position:relative;margin:0;max-height:calc(100vh - 40px);overflow:auto}.contact-form h2{margin:.15rem 0 1rem;font-size:clamp(1.7rem,3vw,2.4rem)}
.dialog-close{position:absolute;right:18px;top:14px;width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:rgba(255,255,255,.08);color:var(--text);font-size:1.7rem;line-height:1;cursor:pointer}.dialog-close:hover{background:rgba(91,215,255,.16)}
@media(max-width:900px){.sponsor-layout{grid-template-columns:1fr}.sponsor-card{padding:1.15rem}.sponsor-actions .btn{width:100%}.main-sponsor img{max-width:100%}}

/* v15: panel solo con tabla y sorteos */
.answers-list,.answer-card{display:none !important}


/* v16: Sponsor más compacto y logo UCA controlado */
.sponsor-section .section-title{
  margin-bottom:1.6rem;
}
.sponsor-layout{
  align-items:stretch;
}
.sponsor-card.main-sponsor{
  overflow:hidden;
}
.sponsor-logo-box{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:150px;
  margin:.4rem auto 1.1rem;
  padding:1rem;
  border-radius:22px;
  background:rgba(0,0,0,.28);
  border:1px solid rgba(255,255,255,.08);
}
.main-sponsor .sponsor-logo-box img,
.main-sponsor img{
  width:100% !important;
  max-width:560px !important;
  max-height:170px !important;
  height:auto !important;
  object-fit:contain !important;
  margin:0 auto !important;
  display:block !important;
}
.sponsor-call h3{
  max-width:520px;
}
@media(max-width:900px){
  .sponsor-logo-box{min-height:120px;padding:.7rem;}
  .main-sponsor .sponsor-logo-box img,
  .main-sponsor img{max-width:100% !important;max-height:140px !important;}
}

/* v16: Panel de resultados sin detalle de respuestas */
.panel-hero .lead{max-width:780px;}
.answers-list,
.answer-card,
#respuestasLista,
.respuestas-list,
.respuestas-recibidas,
.correccion-section{
  display:none !important;
  visibility:hidden !important;
  height:0 !important;
  overflow:hidden !important;
  margin:0 !important;
  padding:0 !important;
}