/* Layout: one scrolling site; each block is a "tarjeta" pair — the brand's two offset cards — so comparison is the visual grammar of the page. */
:root{
  --paper:#F5F5F0; --ink:#0E0E10; --ink-2:#3B3B44; --muted:#5D5D66;
  --blue:#2F4BFF; --blue-ink:#FFFFFF; --blue-soft:#E3E8FF;
  --orange:#FF6B2C; --orange-ink:#0E0E10; --orange-soft:#FFE3D6;
  --card:#FFFFFF; --line:#D6D6CE; --band:#0E0E10; --band-ink:#F5F5F0; --band-muted:#B9B9B2;
  --mark-a:#2F4BFF; --mark-b:#FF6B2C; --hl-a:#C9D2FF; --hl-b:#FFC9B0;
  --f-display:"Unbounded","Arial Black",system-ui,sans-serif;
  --f-body:"Space Grotesk",system-ui,-apple-system,"Segoe UI",sans-serif;
  --r:18px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --paper:#111114; --ink:#F2F2EC; --ink-2:#CFCFC8; --muted:#A3A39C;
  --blue:#5B72FF; --blue-ink:#FFFFFF; --blue-soft:#1C2250; --orange-soft:#3A2116;
  --card:#1A1A1F; --line:#2E2E36; --band:#1F2350; --band-ink:#F5F5F0; --band-muted:#C3C8E8;
  --mark-a:#5B72FF; --hl-a:#2B3580; --hl-b:#6A3218; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#111114; --ink:#F2F2EC; --ink-2:#CFCFC8; --muted:#A3A39C;
  --blue:#5B72FF; --blue-ink:#FFFFFF; --blue-soft:#1C2250; --orange-soft:#3A2116;
  --card:#1A1A1F; --line:#2E2E36; --band:#1F2350; --band-ink:#F5F5F0; --band-muted:#C3C8E8;
  --mark-a:#5B72FF; --hl-a:#2B3580; --hl-b:#6A3218; color-scheme:dark}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:17px;line-height:1.55;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--paper)}
a{color:inherit}
h1,h2,h3{font-family:var(--f-display);font-weight:800;letter-spacing:-.025em;line-height:1.05;margin:0;text-wrap:balance}
p{margin:0}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:6px}
.wrap{max-width:1160px;margin-inline:auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.mark{display:inline-block;flex:none}
.mark .a{fill:var(--mark-a)} .mark .b{fill:var(--mark-b)}
.chip{display:inline-flex;align-items:center;padding:6px 14px;border-radius:999px;font:700 13px var(--f-body);letter-spacing:.07em;text-transform:uppercase;white-space:nowrap}
.c-dato{background:var(--blue);color:var(--blue-ink)}
.c-op{background:var(--orange);color:var(--orange-ink)}
.c-ia{background:var(--ink);color:var(--paper)}
.c-fuente{box-shadow:inset 0 0 0 2px var(--ink)}
.c-ctx{outline:2px dashed var(--ink);outline-offset:-2px}
.eyebrow{font:700 13px var(--f-body);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.btn{display:inline-flex;align-items:center;gap:10px;min-height:48px;padding:0 22px;border-radius:999px;font:700 16px var(--f-body);text-decoration:none;border:0;cursor:pointer}
.btn-o{background:var(--orange);color:var(--orange-ink)}
.btn-o:hover{filter:brightness(1.06)}
.btn-line{box-shadow:inset 0 0 0 2px currentColor;background:transparent;color:inherit}
.btn-line:hover{background:color-mix(in srgb,currentColor 8%,transparent)}

/* header */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--paper);border-bottom:1.5px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:20px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex:none}
.brand b{font:800 22px var(--f-display);letter-spacing:-.03em}
.nav{display:flex;gap:2px;margin-left:auto;overflow-x:auto;scrollbar-width:none;min-width:0}
.nav::-webkit-scrollbar{display:none}
.nav a{font-weight:500;font-size:15px;text-decoration:none;padding:8px 11px;border-radius:999px;white-space:nowrap;color:var(--ink-2)}
.nav a:hover{background:var(--blue-soft);color:var(--ink)}
@media (max-width:980px){.top .wrap{flex-wrap:wrap;gap:0;padding-block:10px}.nav{margin-left:0;width:100%;padding-top:6px}}

/* hero */
.hero{padding-block:56px 72px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:48px;align-items:center}
.hero h1{font-size:clamp(40px,6vw,76px);margin-top:16px}
.hero h1 em{font-style:normal;color:var(--blue)}
.hero .lede{margin-top:22px;font-size:20px;color:var(--ink-2);max-width:40ch}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.compare{display:flex;flex-direction:column;gap:14px}
.cmp-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.cmp-head span:last-child{font-size:14px;color:var(--muted)}
.cmp{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r);padding:20px 22px;display:flex;flex-direction:column;gap:10px;box-shadow:0 14px 28px -20px rgba(14,14,16,.5)}
.compare .cmp:nth-child(2){margin-right:56px}.compare .cmp:nth-child(3){margin-inline:28px}.compare .cmp:nth-child(4){margin-left:56px}
.cmp-top{display:flex;justify-content:space-between;align-items:center;gap:10px}
.cmp-top strong{font-size:14px;letter-spacing:.1em;text-transform:uppercase}
.cmp p{font-size:20px;font-weight:500;line-height:1.3}
.lupa{background:var(--blue);color:var(--blue-ink);border-radius:var(--r);padding:16px 20px;font-size:17px}
.lupa b{font-family:var(--f-display);font-weight:700;margin-right:6px}
@media (max-width:900px){.hero-grid{grid-template-columns:minmax(0,1fr)}.compare .cmp:nth-child(n){margin-inline:0}}

/* sections */
section{padding-block:80px;border-top:1.5px solid var(--line)}
.sec-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px 48px;align-items:end;margin-bottom:40px}
.sec-head h2{font-size:clamp(30px,4vw,48px);margin-top:12px}
.sec-head p{color:var(--ink-2);max-width:52ch}
@media (max-width:820px){.sec-head{grid-template-columns:minmax(0,1fr)}}
.ex-note{font-size:14px;color:var(--muted);margin-top:14px}

/* tapas */
.tapas{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.tapa{display:flex;flex-direction:column;gap:10px;min-width:0}
.tapa .sheet{aspect-ratio:3/4;max-width:100%;border-radius:10px;background:var(--card);border:1.5px solid var(--line);padding:14px;display:flex;flex-direction:column;gap:8px;position:relative;overflow:hidden}
.tapa .sheet .mast{font:800 15px var(--f-display);letter-spacing:-.01em;padding-bottom:8px;border-bottom:2px solid var(--ink)}
.tapa .sheet .ph{flex:1;border-radius:6px;background:repeating-linear-gradient(0deg,var(--line) 0 2px,transparent 2px 12px);opacity:.7}
.tapa .sheet .slot{position:absolute;inset:auto 14px 14px;font-size:13px;color:var(--muted);background:var(--card);padding:6px 8px;border-radius:6px;text-align:center}
.tapa dl{margin:0;display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 10px;font-size:14px}
.tapa dt{color:var(--muted)}
.tapa dd{margin:0;font-weight:500}
.tapas-read{margin-top:24px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.read-box{border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:8px;min-width:0}
.read-box b{font:800 34px/1 var(--f-display);font-variant-numeric:tabular-nums}
.read-box span{font-size:15px}
.rb1{background:var(--blue);color:var(--blue-ink)}
.rb2{background:var(--orange);color:var(--orange-ink)}
.rb3{background:var(--band);color:var(--band-ink)}
@media (max-width:900px){.tapas{grid-template-columns:repeat(2,minmax(0,1fr))}.tapas-read{grid-template-columns:minmax(0,1fr)}}

/* comparativos */
.cgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.ccard{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:12px;min-width:0}
.ccard h3{font-size:20px;line-height:1.15}
.ccard .bar{display:flex;height:10px;border-radius:999px;overflow:hidden;background:var(--line)}
.ccard .bar i{display:block;height:100%}
.ccard ul{margin:0;padding:0;list-style:none;display:grid;gap:6px;font-size:15px}
.ccard li{display:flex;justify-content:space-between;gap:10px;border-bottom:1px dashed var(--line);padding-bottom:6px}
.ccard li span:last-child{color:var(--muted);text-align:right}
.ccard .ctype{display:flex;gap:6px;flex-wrap:wrap}
@media (max-width:900px){.cgrid{grid-template-columns:minmax(0,1fr)}}

/* laboratorio */
.lab-in{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.lab-in .field{display:flex;flex-direction:column;gap:8px;min-width:0}
.lab-in label{font-weight:700;display:flex;justify-content:space-between;gap:8px;align-items:center}
.lab-in textarea{width:100%;min-height:210px;resize:vertical;border-radius:14px;border:1.5px solid var(--line);background:var(--card);color:var(--ink);padding:14px 16px;font:400 16px/1.5 var(--f-body)}
.lab-in textarea:focus{outline:3px solid var(--blue);outline-offset:1px}
.lab-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;align-items:center}
.lab-actions small{color:var(--muted);font-size:14px}
.lab-out{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:24px}
.res{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:18px;min-width:0}
.res h3{font-size:20px}
.res.a{border-top:6px solid var(--blue)} .res.b{border-top:6px solid var(--orange)}
.kpis{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.kpi{display:flex;flex-direction:column;gap:2px;min-width:0}
.kpi b{font:800 26px/1 var(--f-display);font-variant-numeric:tabular-nums}
.kpi span{font-size:12.5px;color:var(--muted);line-height:1.3}
.blk h4{margin:0 0 8px;font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.words{display:flex;flex-wrap:wrap;gap:6px}
.words span{font-size:14px;padding:4px 10px;border-radius:999px;background:var(--blue-soft)}
.words span em{font-style:normal;font-weight:700;margin-left:6px;font-variant-numeric:tabular-nums}
.res.b .words span{background:var(--orange-soft)}
.words .none{background:transparent!important;color:var(--muted);padding-left:0}
.meter{display:flex;flex-direction:column;gap:6px}
.meter .track{position:relative;height:14px;border-radius:999px;background:linear-gradient(90deg,var(--blue-soft),var(--line),var(--orange-soft))}
.meter .dot{position:absolute;top:50%;width:22px;height:22px;margin-left:-11px;margin-top:-11px;border-radius:50%;background:var(--ink);box-shadow:0 0 0 3px var(--card);transition:left .4s}
.meter .ends{display:flex;justify-content:space-between;gap:10px;font-size:12.5px;color:var(--muted)}
.meter p{font-size:14px;color:var(--ink-2)}
.shared{grid-column:1/-1;background:var(--band);color:var(--band-ink);border-radius:var(--r);padding:22px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.shared h4{margin:0 0 8px;font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--band-muted)}
.shared .words span{background:rgba(255,255,255,.12)}
.lab-caveat{margin-top:16px;font-size:14px;color:var(--muted);max-width:80ch}
@media (max-width:900px){.lab-in,.lab-out{grid-template-columns:minmax(0,1fr)}.shared{grid-template-columns:minmax(0,1fr)}}
@media (max-width:480px){.kpis{grid-template-columns:repeat(2,minmax(0,1fr))}}

/* notas */
.notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.note{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column;gap:10px;min-width:0}
.note .k{font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--blue)}
.note h3{font-size:20px;line-height:1.15}
.note p{color:var(--ink-2);font-size:16px}
.note details{margin-top:auto;border-top:1.5px solid var(--line);padding-top:10px}
.note summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;min-height:32px;align-items:center}
.note summary::-webkit-details-marker{display:none}
.note summary::after{content:"+";font:800 20px var(--f-display);color:var(--orange)}
.note details[open] summary::after{content:"–"}
.note details p,.note details ul{margin-top:8px;font-size:15.5px;color:var(--ink-2)}
.note details ul{padding-left:20px;display:grid;gap:4px}
@media (max-width:900px){.notes{grid-template-columns:minmax(0,1fr)}}

/* estudiantes */
.play{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:20px}
.quiz,.realia{border-radius:var(--r);padding:28px;display:flex;flex-direction:column;gap:16px;min-width:0}
.quiz{background:var(--card);border:1.5px solid var(--line)}
.quiz-q{font-size:22px;font-weight:500;line-height:1.35;min-height:3.2em}
.quiz-opts{display:flex;flex-wrap:wrap;gap:10px}
.quiz-opts button{font:700 15px var(--f-body);letter-spacing:.06em;text-transform:uppercase;min-height:48px;padding:0 20px;border-radius:999px;border:2px solid var(--ink);background:transparent;color:var(--ink);cursor:pointer}
.quiz-opts button:hover{background:var(--blue-soft)}
.quiz-opts button.right{background:var(--blue);border-color:var(--blue);color:var(--blue-ink)}
.quiz-opts button.wrong{border-style:dashed;opacity:.6}
.quiz-fb{min-height:3em;color:var(--ink-2)}
.quiz-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-top:auto;padding-top:14px;border-top:1.5px solid var(--line);font-size:14px;color:var(--muted)}
.quiz-foot .score{font:800 18px var(--f-display);color:var(--ink);font-variant-numeric:tabular-nums}
.realia{background:var(--band);color:var(--band-ink)}
.realia .ph{flex:1;min-height:200px;border-radius:14px;border:2px dashed var(--band-muted);display:grid;place-items:center;color:var(--band-muted);text-align:center;padding:16px}
.realia h3{font-size:26px}
.realia .two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.realia .two button{min-height:56px;border-radius:14px;border:0;font:800 20px var(--f-display);cursor:pointer}
.realia .two .r{background:var(--band-ink);color:#0E0E10}
.realia .two .i{background:var(--orange);color:var(--orange-ink)}
.realia .note-r{font-size:15px;color:var(--band-muted);min-height:1.5em}
@media (max-width:900px){.play{grid-template-columns:minmax(0,1fr)}}

/* docentes */
.fichas{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.ficha{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r);padding:24px;display:flex;flex-direction:column;gap:12px;min-width:0}
.ficha .meta{display:flex;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.ficha .meta span{padding:3px 10px;border-radius:999px;background:var(--blue-soft);color:var(--ink)}
.ficha h3{font-size:21px;line-height:1.15}
.ficha p{color:var(--ink-2);font-size:16px}
.ficha .soon{margin-top:auto;font-size:14px;font-weight:700;color:var(--blue)}
.nl{margin-top:20px;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:28px;align-items:start;background:var(--blue);color:var(--blue-ink);border-radius:var(--r);padding:32px;scroll-margin-top:90px}
.nl-main{display:flex;flex-direction:column;gap:12px;min-width:0}
.nl h3{font-size:clamp(28px,3.4vw,40px)}
.nl form{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.nl label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.nl input,.nl select{flex:1 1 220px;min-width:0;min-height:50px;border-radius:999px;border:0;padding:0 20px;font:500 16px var(--f-body);background:#FFFFFF;color:#0E0E10}
.nl .msg{flex-basis:100%;font-size:15px;min-height:1.4em}
.nl-parts{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;counter-reset:p}
.nl-parts li{counter-increment:p;background:rgba(255,255,255,.12);border-radius:14px;padding:14px 16px 14px 56px;position:relative}
.nl-parts li::before{content:counter(p);position:absolute;left:14px;top:14px;width:30px;height:30px;border-radius:9px;background:var(--orange);color:var(--orange-ink);display:grid;place-items:center;font:800 15px var(--f-display)}
.nl-parts b{display:block}
.nl-parts span{font-size:15px;opacity:.9}
@media (max-width:900px){.fichas{grid-template-columns:minmax(0,1fr)}.nl{grid-template-columns:minmax(0,1fr);padding:24px 20px}}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.filters button{min-height:42px;padding:0 16px;border-radius:999px;border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:500 15px var(--f-body);cursor:pointer}
.filters button:hover{border-color:var(--blue)}
.filters button[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.ncount{font-size:14px;color:var(--muted);margin-bottom:16px}
.note .top-row{display:flex;justify-content:space-between;align-items:center;gap:8px}
.note .lvl{font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;background:var(--blue-soft);color:var(--ink)}
.note .lvl.mid{background:var(--orange-soft)}
.note .aula{margin-top:10px;padding:10px 12px;border-radius:10px;background:var(--paper);font-size:15px}
.note .aula b{color:var(--blue)}

/* escuelas */
.desafio{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}
.steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px;counter-reset:s}
.steps li{counter-increment:s;display:grid;grid-template-columns:52px minmax(0,1fr);gap:14px;align-items:start;background:var(--card);border:1.5px solid var(--line);border-radius:var(--r);padding:18px 20px}
.steps li::before{content:counter(s);display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--orange);color:var(--orange-ink);font:800 20px var(--f-display)}
.steps b{display:block;font-size:18px}
.steps span{color:var(--ink-2);font-size:16px}
.desafio-side{background:var(--band);color:var(--band-ink);border-radius:var(--r);padding:28px;display:flex;flex-direction:column;gap:16px}
.desafio-side h3{font-size:28px}
.desafio-side p{color:var(--band-muted)}
@media (max-width:900px){.desafio{grid-template-columns:minmax(0,1fr)}}

/* investigación */
.duo{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}
.panel{background:var(--card);border:1.5px solid var(--line);border-radius:var(--r);padding:28px;display:flex;flex-direction:column;gap:14px;min-width:0}
.panel h3{font-size:24px}
.panel p{color:var(--ink-2)}
.prov{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;margin-top:6px}
.prov span{aspect-ratio:1;max-width:100%;border-radius:8px;background:var(--blue-soft);display:grid;place-items:center;font-size:11px;font-weight:700;color:var(--ink-2)}
.tbl-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;padding:10px 8px;border-bottom:1.5px solid var(--line);vertical-align:top}
th{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.st{display:inline-block;padding:2px 10px;border-radius:999px;font-size:13px;font-weight:700;background:var(--blue-soft);color:var(--ink)}
@media (max-width:900px){.duo{grid-template-columns:minmax(0,1fr)}}

/* quiénes */
.about{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:40px;align-items:start}
.about p{color:var(--ink-2);margin-top:14px;max-width:58ch}
.about ul{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:10px}
.about li{background:var(--card);border:1.5px solid var(--line);border-radius:14px;padding:14px 18px}
.about li b{display:block}
.about li span{font-size:15px;color:var(--muted)}
@media (max-width:900px){.about{grid-template-columns:minmax(0,1fr)}}

footer{background:var(--band);color:var(--band-ink);padding-block:48px}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px;align-items:flex-end}
footer .brand b{font-size:28px}
footer p{color:var(--band-muted);font-size:15px;margin-top:10px}
footer small{color:var(--band-muted);font-size:14px}
footer .mark .a{fill:#5B72FF}