:root{
  --navy:#10243E;
  --blue:#246BFD;
  --turq:#20B8A6;
  --amber:#F4B942;
  --paper:#F7F9FC;
  --ink:#243142;
  --muted:#627083;
  --line:#DCE4EE;
  --white:#FFFFFF;
  --shadow:0 18px 45px rgba(16,36,62,.12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  background:var(--white);
  line-height:1.6;
}
button{font:inherit}
.page{width:min(1160px,calc(100% - 40px));margin:0 auto;padding:38px 0 28px}
.intro{
  position:relative;
  overflow:hidden;
  margin-bottom:28px;
  padding:34px 36px 32px;
  border:1px solid var(--line);
  border-radius:28px;
  background:
    radial-gradient(circle at 88% 18%,rgba(32,184,166,.16),transparent 26%),
    radial-gradient(circle at 8% 10%,rgba(36,107,253,.10),transparent 30%),
    linear-gradient(180deg,#fff,#F7F9FC);
}
.intro:after{
  content:"";position:absolute;right:-70px;top:-80px;width:240px;height:240px;
  border:1px solid rgba(36,107,253,.12);border-radius:50%;
  box-shadow:0 0 0 28px rgba(36,107,253,.02),0 0 0 58px rgba(32,184,166,.025);
  pointer-events:none;
}
.eyebrow{
  position:relative;z-index:1;display:inline-flex;gap:.5rem;align-items:center;
  margin:0 0 12px;font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--blue)
}
.eyebrow:before{content:"";width:28px;height:3px;border-radius:9px;background:var(--turq)}
h1{position:relative;z-index:1;margin:0;color:var(--navy);font-size:clamp(2.4rem,5vw,4.35rem);line-height:1.05;letter-spacing:-.05em}
.subtitle{position:relative;z-index:1;max-width:790px;margin:15px 0 0;color:#435268;font-size:clamp(1rem,1.7vw,1.18rem);line-height:1.6}

.simulator{display:grid;grid-template-columns:minmax(310px,350px) minmax(0,1fr);gap:22px;align-items:start}
.controls,.map-panel{background:#fff;border:1px solid var(--line);border-radius:26px;box-shadow:0 10px 28px rgba(16,36,62,.06)}
.controls{padding:24px}
.control-block+.control-block{margin-top:26px}
.control-block h2{margin:0 0 13px;color:var(--navy);font-size:1.03rem;line-height:1.3;letter-spacing:-.01em}
.atom-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.atom-btn{
  min-height:82px;padding:10px 7px;border:1px solid var(--line);border-radius:18px;
  background:#fff;color:var(--navy);cursor:pointer;transition:.18s ease;
}
.atom-btn span{display:block;font-size:1.55rem;font-weight:900;line-height:1.1}
.atom-btn small{display:block;margin-top:5px;color:var(--muted);font-weight:700}
.atom-btn:hover{transform:translateY(-1px);border-color:#BDD0FF;background:#F8FAFF}
.atom-btn.active{background:#EAF1FF;border-color:#BDD0FF;color:var(--blue);box-shadow:inset 0 0 0 1px rgba(36,107,253,.06)}
.atom-btn.active small{color:#496783}
.atom-btn:focus-visible,.object-card:focus-visible,.secondary-btn:focus-visible{outline:3px solid rgba(36,107,253,.22);outline-offset:2px}

.object-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.object-card{
  min-height:137px;padding:12px;border:1px solid var(--line);border-radius:20px;background:#fff;
  color:var(--ink);text-align:left;cursor:pointer;transition:.18s ease;
}
.object-card:hover{transform:translateY(-1px);border-color:#C9D5E3;box-shadow:0 7px 18px rgba(16,36,62,.05)}
.object-card.active{background:linear-gradient(135deg,#EAF1FF,#F5F8FF);border-color:#BDD0FF;box-shadow:inset 0 0 0 1px rgba(36,107,253,.05)}
.object-card .illustration{display:flex;align-items:center;justify-content:center;height:68px;margin-bottom:8px}
.object-card strong{display:block;color:var(--navy);font-size:.9rem;line-height:1.3}
.object-card small{display:block;margin-top:4px;color:var(--muted);font-size:.76rem;line-height:1.35;font-weight:650}
.embedded-art{display:block;width:auto;height:auto;max-width:100%;max-height:100%;object-fit:contain}
.object-card img.card-embedded-art{width:62px!important;height:62px!important;max-width:62px!important;max-height:62px!important;object-fit:contain!important}

.actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:24px}
.secondary-btn{
  min-height:44px;padding:0 15px;border:1px solid #BFCADD;border-radius:999px;background:#fff;
  color:var(--navy);font-weight:800;cursor:pointer;transition:.18s ease;
}
.secondary-btn:hover{border-color:#9FB0C5;background:var(--paper);transform:translateY(-1px)}
.details{margin-top:15px;padding:16px;border:1px solid var(--line);border-radius:18px;background:var(--paper);font-size:.88rem;line-height:1.5}
.details dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:7px 10px}
.details dt{font-weight:850;color:var(--navy)}
.details dd{margin:0;color:var(--muted)}
.details p{margin:13px 0 0;padding-top:12px;border-top:1px solid var(--line);color:var(--muted)}

.map-panel{position:relative;min-width:0;overflow:hidden;padding:10px;background:#fff}
#map{width:100%;height:700px;border-radius:18px;background:#E9EEF4}
.instruction{
  position:absolute;z-index:500;top:26px;left:50%;transform:translateX(-50%);
  max-width:calc(100% - 48px);padding:10px 16px;border:1px solid var(--line);border-radius:999px;
  background:rgba(255,255,255,.96);box-shadow:0 8px 24px rgba(16,36,62,.12);
  color:var(--navy);font-size:.88rem;font-weight:850;text-align:center;pointer-events:none;
}
.result-card{
  position:absolute;z-index:500;left:26px;bottom:26px;max-width:min(400px,calc(100% - 52px));
  padding:16px 18px;border:1px solid var(--line);border-radius:20px;background:rgba(255,255,255,.97);
  box-shadow:0 14px 34px rgba(16,36,62,.14);
}
.result-card strong{display:block;margin-bottom:4px;color:var(--navy);font-size:1.06rem}
.result-card span{display:block;color:var(--muted);line-height:1.45}
.result-card .radius{margin-top:6px;color:var(--blue);font-weight:900}

.leaflet-marker-icon.map-object-icon{object-fit:contain!important;filter:drop-shadow(0 2px 3px rgba(0,0,0,.22))}
.footnote{margin:14px 4px 0;color:var(--muted);font-size:.82rem}

@media(max-width:980px){
  .simulator{grid-template-columns:1fr}
  .controls{order:1}
  .map-panel{order:2}
  #map{height:610px}
}
@media(max-width:620px){
  .page{width:min(100% - 24px,1160px);padding:20px 0}
  .intro{padding:26px 22px 24px;border-radius:24px}
  h1{font-size:2.75rem}
  .controls{padding:18px;border-radius:22px}
  .object-grid{gap:8px}
  .object-card{min-height:128px;padding:10px;border-radius:17px}
  .map-panel{padding:7px;border-radius:22px}
  #map{height:530px;border-radius:16px}
  .instruction{top:18px;max-width:calc(100% - 32px);border-radius:16px;font-size:.79rem;line-height:1.35}
  .result-card{left:18px;bottom:18px;max-width:calc(100% - 36px)}
}


/* V10 — introducción didáctica y retos */
.concept-section{
  display:grid;
  grid-template-columns:minmax(0,1.55fr) minmax(260px,.75fr);
  gap:22px;
  margin:0 0 34px;
  padding:28px 30px;
  border:1px solid var(--line);
  border-radius:26px;
  background:#fff;
  box-shadow:0 10px 28px rgba(16,36,62,.05);
}
.section-kicker{
  margin:0 0 7px;
  color:var(--turq);
  font-size:.76rem;
  font-weight:900;
  letter-spacing:.11em;
  text-transform:uppercase;
}
.concept-copy h2,.section-heading h2{
  margin:0;
  color:var(--navy);
  font-size:clamp(1.7rem,3vw,2.45rem);
  line-height:1.15;
  letter-spacing:-.035em;
}
.concept-copy p:not(.section-kicker){
  margin:13px 0 0;
  color:#435268;
}
.science-note{
  align-self:start;
  padding:20px;
  border:1px solid #CFE7E3;
  border-radius:22px;
  background:linear-gradient(145deg,#F1FBF9,#F8FCFF);
}
.science-note strong{
  display:inline-flex;
  padding:5px 10px;
  border-radius:999px;
  background:#DDF6F1;
  color:#117C70;
  font-size:.78rem;
  font-weight:900;
  text-transform:uppercase;
  letter-spacing:.07em;
}
.science-note p{
  margin:11px 0 0;
  color:#435268;
  font-size:.9rem;
  line-height:1.55;
}
.sim-section{margin-top:6px}
.section-heading{max-width:850px;margin:0 0 18px}
.section-heading>p:not(.section-kicker){margin:10px 0 0;color:var(--muted)}
.control-block h3{margin:0 0 13px;color:var(--navy);font-size:1.03rem;line-height:1.3;letter-spacing:-.01em}
.result-card .diameter{margin-top:2px;color:var(--navy);font-weight:800}

.challenges{
  margin-top:44px;
  padding-top:6px;
}
.challenge-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:16px;
}
.challenge-card{
  display:grid;
  grid-template-columns:46px minmax(0,1fr);
  gap:14px;
  padding:22px;
  border:1px solid var(--line);
  border-radius:24px;
  background:#fff;
  box-shadow:0 9px 25px rgba(16,36,62,.05);
}
.challenge-card-wide{grid-column:1/-1}
.challenge-number{
  width:42px;
  height:42px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:14px;
  background:linear-gradient(135deg,var(--blue),#4E8BFF);
  color:#fff;
  font-weight:900;
  box-shadow:0 7px 16px rgba(36,107,253,.18);
}
.challenge-content{min-width:0}
.challenge-content h3{
  margin:2px 0 9px;
  color:var(--navy);
  font-size:1.14rem;
  line-height:1.3;
}
.challenge-content p{
  margin:0 0 11px;
  color:#526176;
  font-size:.93rem;
  line-height:1.55;
}
.challenge-question{
  padding:11px 13px;
  border-left:3px solid var(--turq);
  border-radius:0 12px 12px 0;
  background:#F5FBFA;
  color:var(--navy)!important;
  font-weight:720;
}
.challenge-content details{
  margin:10px 0 14px;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:9px 0;
}
.challenge-content summary{
  color:var(--blue);
  font-size:.88rem;
  font-weight:850;
  cursor:pointer;
}
.challenge-content details p{margin:8px 0 1px}
.challenge-btn{
  min-height:42px;
  padding:0 15px;
  border:0;
  border-radius:999px;
  background:var(--navy);
  color:#fff;
  font-weight:850;
  cursor:pointer;
  transition:.18s ease;
}
.challenge-btn:hover{transform:translateY(-1px);background:var(--blue)}
.challenge-btn:focus-visible{outline:3px solid rgba(36,107,253,.24);outline-offset:2px}

@media(max-width:900px){
  .concept-section{grid-template-columns:1fr}
  .challenge-grid{grid-template-columns:1fr}
  .challenge-card-wide{grid-column:auto}
}
@media(max-width:620px){
  .concept-section{padding:22px 20px;border-radius:22px}
  .challenge-card{grid-template-columns:38px minmax(0,1fr);gap:11px;padding:18px 16px;border-radius:20px}
  .challenge-number{width:36px;height:36px;border-radius:12px}
}