:root{--bg:#F5F7FA;--panel:#fff;--ink:#0F1B2D;--soft:#52606F;--line:#DCE2EA;--blue:#1B4DB3;--blue-d:#143A8A;--gold:#E3A21A;--gold-bg:#FDF3DC;--serif:'Fraunces',Georgia,serif;--sans:'IBM Plex Sans',system-ui,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit}h1,h2,h3{font-family:var(--serif);margin:0;letter-spacing:-.01em}p{margin:0}.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.nav{position:sticky;top:0;z-index:10;background:rgba(245,247,250,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:22px;padding:13px 22px;flex-wrap:wrap}
.brand{font:700 21px var(--serif);text-decoration:none}.brand span,.foot strong span{color:#8A5A00}
.links{display:flex;gap:4px;flex:1;align-items:center;flex-wrap:wrap}.links a{text-decoration:none;color:var(--soft);font-size:14px;font-weight:500;padding:6px 11px;border-radius:6px}
.links a:hover{color:var(--ink)}.links a.on{background:#E6ECF8;color:var(--blue)}.soon{font-size:12px;color:var(--soft);background:var(--gold-bg);padding:3px 9px;border-radius:20px}
.nav-r{display:flex;align-items:center;gap:12px;font-size:13px}.back{color:var(--soft);text-decoration:none}.who{color:var(--soft)}
.btn{display:inline-block;font:500 14px var(--sans);padding:9px 16px;border-radius:7px;border:1px solid var(--line);background:var(--panel);color:var(--ink);text-decoration:none;cursor:pointer}
.btn.pri{background:var(--blue);border-color:var(--blue);color:#fff}.btn.pri:hover{background:var(--blue-d)}.btn.big{padding:13px 24px;font-size:15.5px}
.hero{padding:64px 0 56px}.hero-g{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(34px,5vw,54px);line-height:1.08;font-weight:700;max-width:14ch}.hero .sub{margin:20px 0 28px;font-size:18px;color:var(--soft);max-width:46ch}.ctas{display:flex;gap:12px;flex-wrap:wrap}
.calc{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:26px;box-shadow:0 18px 40px -22px rgba(15,27,45,.35)}
.calc h2{font-size:15px;color:var(--soft);font-family:var(--sans);font-weight:500;margin-bottom:14px}.fv{font:700 clamp(34px,5vw,46px)/1.1 var(--serif);color:var(--blue)}
.bar{display:flex;height:14px;border-radius:8px;overflow:hidden;background:var(--gold);margin:16px 0 8px}.bar i{display:block;background:var(--blue);width:60%;transition:width .25s}
.leg{display:flex;justify-content:space-between;font-size:13px;color:var(--soft)}.leg b{color:var(--ink);font-weight:600}.leg .g::before,.leg .a::before{content:'';display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:6px}.leg .a::before{background:var(--blue)}.leg .g::before{background:var(--gold)}
.ctl{margin-top:16px}.ctl label{display:flex;justify-content:space-between;font-size:13.5px;color:var(--soft)}.ctl label b{color:var(--ink)}.ctl input{width:100%;accent-color:var(--blue)}
.note{font-size:12px;color:var(--soft);margin-top:14px}
section.s{padding:56px 0;border-top:1px solid var(--line)}.s h2{font-size:clamp(24px,3vw,32px);max-width:24ch}.s .lead{margin:10px 0 28px;color:var(--soft);max-width:60ch}
.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.col{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:22px}.col h3{font-size:18px;margin-bottom:8px}.col p{font-size:14.5px;color:var(--soft)}
.tag{display:inline-block;font-size:12px;font-weight:600;padding:3px 9px;border-radius:5px;margin-bottom:12px}.tag.ok{background:#E3F3EA;color:#17613F}.tag.next{background:var(--gold-bg);color:#8A5A00}
.path{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}.path a{display:flex;justify-content:space-between;gap:12px;padding:15px 20px;text-decoration:none;border-top:1px solid var(--line)}.path a:first-child{border-top:0}.path a:hover{background:#F0F4FB}.path small{color:var(--soft)}
.page{padding:40px 22px 70px}.page h1{font-size:clamp(28px,4vw,38px);margin-bottom:8px}.page .lead{color:var(--soft);margin-bottom:26px;max-width:60ch}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:24px;margin-bottom:18px}.panel h2{font-size:20px;margin-bottom:4px}
.lesson{max-width:68ch}.lesson p{margin:0 0 16px;font-size:17px;line-height:1.7}.lesson code{background:#E6ECF8;padding:2px 6px;border-radius:4px;font-size:14.5px}
.done{color:#17613F;font-weight:500}.crumb{font-size:13.5px;color:var(--soft);margin-bottom:14px;display:block}.pn{display:flex;justify-content:space-between;margin-top:26px}
.gl{display:grid;gap:10px}.gl div{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px 18px}.gl dt{font-weight:600}.gl dd{margin:2px 0 0;color:var(--soft);font-size:14.5px}
.search{width:100%;max-width:380px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;margin-bottom:18px}
table{width:100%;border-collapse:collapse;font-size:14px}th{text-align:left;color:var(--soft);font-weight:500;padding:8px 10px;border-bottom:1px solid var(--line)}td{padding:10px;border-bottom:1px solid var(--line)}
.login{max-width:400px;margin:56px auto;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:32px}.login h1{font-size:24px}.login label{display:block;font-size:13px;color:var(--soft);margin:16px 0 6px}.login input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:7px;font:inherit}.login .btn{width:100%;margin-top:22px}
.err{background:#FBEAEA;color:#9B2C3A;font-size:13px;padding:9px 12px;border-radius:7px;margin-top:14px}.demo{margin-top:24px;padding-top:18px;border-top:1px solid var(--line);font-size:12.5px;color:var(--soft)}.demo code{background:var(--bg);padding:1px 5px;border-radius:4px}
.foot{border-top:1px solid var(--line);padding:34px 0;font-size:14px}.legal{margin-top:8px;font-size:12.5px;color:var(--soft);max-width:80ch}
@media(max-width:820px){.hero-g,.cols{grid-template-columns:1fr}.back{display:none}.hero{padding-top:36px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.qh{font-size:20px;margin:30px 0 12px}.qgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.qcard{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 14px}.qcard.old{opacity:.65}
.ql{font-size:12.5px;color:var(--soft)}.ql small{opacity:.8}.qv{font:600 20px var(--serif);margin-top:2px}.qv small{font:400 13px var(--sans);color:var(--soft)}
.qs{font-size:12.5px;color:var(--soft);margin-top:2px}.pos{color:#17613F}.neg{color:#9B2C3A}
.tick{background:var(--ink);color:#fff;font-size:13px}.tick .wrap{display:flex;gap:26px;padding:8px 22px;overflow-x:auto;white-space:nowrap}.tick b{font-weight:600;margin-left:6px;color:var(--gold)}.tick a{margin-left:auto;color:#fff;opacity:.8}
.simg{display:grid;grid-template-columns:1fr 1fr;gap:18px}.simg .ctl:first-of-type{margin-top:8px}.rr{display:flex;justify-content:space-between;gap:14px;padding:9px 0;border-bottom:1px solid var(--line);font-size:15px}.rr b{font:600 17px var(--serif);text-align:right}
.verd{margin-top:14px;padding:12px 14px;background:var(--gold-bg);border-radius:8px;font-size:14.5px}@media(max-width:820px){.simg{grid-template-columns:1fr}}
.qnav{display:flex;gap:6px;flex-wrap:wrap;margin:-4px 0 22px}.qnav a{text-decoration:none;font-size:14px;padding:6px 13px;border:1px solid var(--line);border-radius:20px;background:var(--panel);color:var(--soft)}.qnav a.on{background:var(--blue);border-color:var(--blue);color:#fff}
.tbl{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow-x:auto}.r{text-align:right}.star{background:none;border:0;font-size:19px;cursor:pointer;color:var(--soft)}.star.on{color:var(--gold)}
.opt{display:block;padding:11px 14px;border:1px solid var(--line);border-radius:8px;margin:8px 0;cursor:pointer;background:var(--panel)}.opt:has(input:checked){border-color:var(--blue);background:#E6ECF8}.opt input{margin-right:8px}
/* Startups */
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 16px}.chips a{font-size:13.5px;text-decoration:none;color:var(--soft);padding:6px 13px;border:1px solid var(--line);border-radius:20px;background:var(--panel)}.chips a.on{background:var(--blue);border-color:var(--blue);color:#fff}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px;margin:0 0 26px}.stat{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px}.stat b{display:block;font:700 26px var(--serif);color:var(--blue)}.stat span{font-size:13px;color:var(--soft)}
.bars{display:grid;gap:8px;margin:6px 0 4px}.bars div{display:grid;grid-template-columns:90px 1fr 80px;gap:10px;align-items:center;font-size:14px}.bars i{display:block;height:14px;border-radius:7px;background:var(--blue)}
.sc{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px;margin-bottom:12px}.sc h3,.sc h2.sch{font-size:19px}.sc .meta{font-size:13px;color:var(--soft);margin:2px 0 8px}.sc dl{margin:10px 0 0;font-size:14px;display:grid;grid-template-columns:110px 1fr;gap:4px 12px}.sc dt{color:var(--soft)}.sc dd{margin:0}
.chk{display:flex;gap:12px;align-items:flex-start;padding:11px 0;border-bottom:1px solid var(--line)}.chk input{margin-top:5px;width:18px;height:18px}.chk a{font-size:13.5px;color:var(--blue)}
.star{background:none;border:0;font-size:20px;cursor:pointer;color:#B9C2CE}.star.on{color:var(--gold)}
/* Accesibilidad y adaptación a pantallas chicas */
.skip{position:absolute;left:-9999px;top:0}.skip:focus{left:8px;top:8px;z-index:100;background:#fff;color:#1B4DB3;padding:8px 14px;border-radius:6px;border:2px solid #1B4DB3}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #1B4DB3;outline-offset:2px}
.panel,.sc{overflow-x:auto}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* Móviles: menú en una sola fila deslizable y márgenes laterales */
@media(max-width:760px){
 .nav-in{gap:8px 12px;padding:10px 16px}
 .links{order:3;flex-basis:100%;flex-wrap:nowrap;overflow-x:auto;white-space:nowrap;padding-bottom:4px;-webkit-overflow-scrolling:touch;scrollbar-width:none}
 .links::-webkit-scrollbar{display:none}
 .links a{flex:0 0 auto}
 .nav-r{margin-left:auto}.nav-r .back{display:none}
 .page{padding:26px 16px 56px}
 .wrap{padding-left:16px;padding-right:16px}
 .chips.scroll{flex-wrap:nowrap;overflow-x:auto;padding-bottom:6px;scrollbar-width:thin}
 .chips.scroll a{flex:0 0 auto;white-space:nowrap}
}

.stickybar{display:none}
@media(max-width:820px){
 .stickybar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:20;justify-content:space-around;gap:6px;padding:10px 12px;background:#fff;border-top:1px solid var(--line);box-shadow:0 -4px 14px rgba(15,23,42,.08);font-size:13px}
 .stickybar span{display:flex;flex-direction:column;align-items:center;color:var(--soft)}.stickybar b{color:var(--ink);font-size:14px}
 body:has(.stickybar){padding-bottom:64px}
 .rrs{flex-direction:column;align-items:flex-start;gap:2px}.rrs b{text-align:left}
}

@media(max-width:640px){
 table.stk thead{display:none}
 table.stk,table.stk tbody,table.stk tr,table.stk td{display:block;width:100%}
 table.stk tr{padding:10px 0;border-bottom:1px solid var(--line)}
 table.stk td{border:0;padding:2px 0}
 table.stk td[data-l]::before{content:attr(data-l) ": ";font-weight:600;color:var(--soft)}
}
.tw{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}

.lesson h2{font-size:22px;margin:24px 0 8px}
.notaapp{display:inline-block;margin:-6px 0 8px 10px;padding:6px 8px;font-size:13.5px;color:var(--blue);background:none;border:0}

main:focus{outline:none}
@media print{.nav,.skip,footer,.stickybar,.chips,form[role=search],.btn,#quiz button{display:none!important}body{background:#fff;color:#000}.panel,.sc{border:1px solid #999;box-shadow:none}a{color:#000;text-decoration:underline}.lesson a[href^="http"]::after{content:" (" attr(href) ")";font-size:.85em;color:#444}.wrap{max-width:100
@media print{.nav,.skip,footer,.stickybar,.chips,form[role=search],.btn,#quiz button{display:none!important}body{background:#fff;color:#000}.panel,.sc{border:1px solid #999;box-shadow:none}a{color:#000;text-decoration:underline}.lesson a[href^="http"]::after{content:" (" attr(href) ")";font-size:.85em;color:#444}.wrap{max-width:100%;padding:0}}