/* Sistemas Embebidos · estilos del sitio
   Diseño de contenido: proyecto Circuitos Eléctricos (papel claro, acento por tema).
   Logo, banner y footer: los del home original. */
:root{--paper:#F1F4F8;--br:#9A5B00;--ink:#12202B;--mut:#5A6B76;--line:#D5DDE8;--card:#fff;--c:#2B6CB0;--r:14px;font-family:'Bricolage Grotesque',system-ui,sans-serif;color-scheme:light}
[data-th=dark]{--paper:#0D1620;--br:#F2B04A;--ink:#E6EEF2;--mut:#9db3bd;--line:#223142;--card:#132130;color-scheme:dark}
/* acento por tema (también lo usan las tarjetas del home) */
[data-k=res]{--c:#2B6CB0}[data-k=cap]{--c:#0A86A8}[data-k=ind]{--c:#D9622B}[data-k=imp]{--c:#5B4BC4}[data-k=sd]{--c:#A8403F}
[data-th=dark] [data-k=res]{--c:#5FA3E6}[data-th=dark] [data-k=cap]{--c:#38C6E8}[data-th=dark] [data-k=ind]{--c:#F08A55}[data-th=dark] [data-k=imp]{--c:#9C90F5}[data-th=dark] [data-k=sd]{--c:#E58180}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{overflow-x:clip;background:var(--paper);color:var(--ink);line-height:1.6;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:32px 32px}
@media(hover:hover) and (min-width:1021px){body{background-attachment:fixed}}
:focus-visible{outline:2px solid var(--c);outline-offset:2px}
.skip{position:absolute;left:-999px;z-index:99}.skip:focus{left:8px;top:8px;background:var(--card);color:var(--ink);padding:6px 12px}
img,svg{max-width:100%}
a{color:inherit}

/* ===== Encabezado (logo del home) ===== */
.top{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px max(20px,calc((100% - 1160px)/2));background:#0B1726;border-bottom:1px solid #1F3248;color:#EAF1FA;font-family:'Space Grotesk',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif}
.top :focus-visible{outline-color:#F2B04A}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.mark{width:42px;height:42px;display:block;filter:drop-shadow(0 0 10px rgba(242,176,74,.3))}
.mark.sm{width:34px;height:34px;filter:none}
.mark .beat{stroke-dasharray:60;animation:beat 2.6s ease-in-out infinite}
@keyframes beat{0%{stroke-dashoffset:60}45%,100%{stroke-dashoffset:0}}
.brand-t{display:flex;flex-direction:column;line-height:1.05}
.brand-t b{font-size:1.05rem;font-weight:700;letter-spacing:-.01em}
.brand-t b:last-child{color:#F2B04A}
.top nav{display:flex;align-items:center;gap:4px}
.top nav a{padding:8px 13px;border-radius:99px;font-weight:500;color:#93A9C2;text-decoration:none;transition:color .2s,background .2s;white-space:nowrap}
.top nav a:hover,.top nav a[aria-current=page]{color:#EAF1FA;background:rgba(242,176,74,.12)}
.burger{display:none;width:44px;height:44px;border:1px solid #2E4660;border-radius:12px;background:transparent;position:relative;cursor:pointer}
.burger span{position:absolute;left:12px;right:12px;height:2px;background:#EAF1FA;border-radius:2px;transition:.25s}
.burger span:nth-child(1){top:15px}.burger span:nth-child(2){top:21px}.burger span:nth-child(3){top:27px}
.burger[aria-expanded=true] span:nth-child(1){top:21px;transform:rotate(45deg)}
.burger[aria-expanded=true] span:nth-child(2){opacity:0}
.burger[aria-expanded=true] span:nth-child(3){top:21px;transform:rotate(-45deg)}

/* ===== Portada del home: código + circuito (el fondo de cuadrados se ve a través) ===== */
.hh{border-bottom:1px solid var(--line)}
.hh-in{width:min(1100px,100% - 10vw);margin:auto;padding:clamp(40px,7vw,84px) 0 clamp(36px,5vw,56px);display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(28px,4vw,56px);align-items:center}
.hh h1{font-size:clamp(2.1rem,4.6vw,3.5rem);line-height:1.06;letter-spacing:-.025em;font-weight:800}
.hh h1 em{display:block;font-style:normal;color:var(--br)}
.hh .lead{color:var(--mut);max-width:50ch;font-size:1.06rem;margin-top:16px}
.btns{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0 0}
.btn{display:inline-flex;align-items:center;padding:12px 22px;border-radius:10px;font-weight:600;text-decoration:none;border:1px solid transparent;transition:background .2s,border-color .2s}
.btn.pri{background:#0B1726;color:#fff}.btn.pri:hover{background:#17314f}
[data-th=dark] .btn.pri{background:#F2B04A;color:#1b1202}[data-th=dark] .btn.pri:hover{background:#ffc46b}
.btn.ghost{border-color:var(--ink);color:var(--ink)}.btn.ghost:hover{background:rgba(127,127,127,.14)}
.facts{list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px 28px;margin-top:36px;padding:20px 0 0;border-top:1px solid var(--line)}
.facts b{display:block;font-weight:700}
.facts span{color:var(--mut);font-size:.9rem}
.dev{margin:0;background:#0B1726;border:1px solid #223853;border-radius:var(--r);box-shadow:0 24px 60px rgba(11,23,38,.28);overflow:hidden;color:#DCE7F5}
.ed-bar{display:flex;align-items:center;gap:6px;padding:10px 14px;border-bottom:1px solid #1F3248;font:500 .8rem ui-monospace,'JetBrains Mono',Consolas,monospace;color:#7f95ad}
.ed-bar i{width:9px;height:9px;border-radius:50%;background:#26405c}.ed-bar span{margin-left:8px}
.dev pre{margin:0;padding:14px 0;font:.85rem/1.75 ui-monospace,'JetBrains Mono',Consolas,monospace;overflow-x:auto}
.dev code{display:block;min-width:max-content}
.l{display:block;padding:0 18px;border-left:3px solid transparent}
.l.a{border-left-color:#F2B04A;background:rgba(242,176,74,.14)}
.run .l.a{animation:la 2s steps(1) infinite}
.run .l.b{animation:lb 2s steps(1) infinite}
.k{color:#7CB7FF}.fn{color:#F2B04A}.n{color:#FF9E7A}.c{color:#6B829C}
.ckt{display:block;width:100%;height:auto;border-top:1px solid #1F3248;background:rgba(255,255,255,.025)}
.ckt .w,.ckt .pt{fill:none;stroke-linecap:round;stroke-linejoin:round;stroke-width:2}
.ckt .w{stroke:#5B7694}.ckt .pt{stroke:#F2B04A}
.ckt .chip{fill:#10233a;stroke:#F2B04A;stroke-width:2}
.ckt text{font:500 12px ui-monospace,Consolas,monospace;fill:#93A9C2}
.ckt .fl{fill:none;stroke:#FFD58F;stroke-width:2.4;stroke-linecap:round;stroke-dasharray:2 10}
.run .ckt .fl{animation:flow 1s linear infinite,pw 2s steps(1) infinite}
.run .ckt .glow{animation:pw 2s steps(1) infinite}
@keyframes flow{to{stroke-dashoffset:-12}}
@keyframes pw{0%{opacity:1}50%{opacity:0}}
@keyframes la{50%{background:none;border-left-color:transparent}}
@keyframes lb{50%{background:rgba(242,176,74,.14);border-left-color:#F2B04A}}
@media(max-width:900px){.hh-in{grid-template-columns:1fr}.dev{max-width:580px}}

/* ===== Secciones del home ===== */
.wrap{width:min(1100px,100% - 10vw);margin-inline:auto}
.sec{padding:clamp(40px,6vw,64px) 0 8px}
.sec:last-of-type{padding-bottom:clamp(40px,6vw,64px)}
.sec-h{max-width:720px;margin-bottom:26px}
.tag{font-weight:700;font-size:.95rem;color:var(--br);margin-bottom:4px}
.sec-h h2{font-size:clamp(1.55rem,3vw,2.15rem);line-height:1.15;letter-spacing:-.015em;font-weight:800;margin-bottom:8px}
.sec-h p:not(.tag){color:var(--mut);max-width:62ch}

.temas{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,310px),1fr));gap:18px}
.tema{position:relative;display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-left:5px solid var(--c);border-radius:var(--r);padding:24px 24px 22px;color:inherit;text-decoration:none;transition:box-shadow .25s,border-color .25s}
.tema:hover{box-shadow:0 10px 28px rgba(18,32,43,.12);border-color:var(--c)}
.tema:focus-visible{outline-offset:3px}
.tema .num{position:absolute;top:18px;right:20px;font-weight:700;font-size:.85rem;color:var(--mut)}
.tema .ico{width:44px;height:44px;fill:none;stroke:var(--c);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;margin-bottom:6px}
.tema h3{font-size:1.3rem;line-height:1.2;color:var(--c)}
.tema p{color:var(--mut);font-size:.96rem}
.meta{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 10px;padding:0}
.meta li{font-size:.78rem;font-weight:600;padding:2px 10px;border-radius:99px;background:var(--paper);color:var(--mut)}
.go{margin-top:auto;align-self:flex-start;display:inline-flex;align-items:center;gap:8px;background:var(--c);color:#fff;font-weight:600;padding:9px 16px;border-radius:9px;transition:filter .2s}
[data-th=dark] .go{color:#08141a}
.tema:hover .go{filter:brightness(1.08)}
.soon{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--mut);border:1px solid var(--line);padding:2px 10px;border-radius:99px;align-self:flex-start}

.metodo{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.metodo li{background:var(--card);border:1px solid var(--line);border-left:5px solid var(--br);border-radius:0 12px 12px 0;padding:16px 18px}
.metodo i{display:block;font-style:normal;font-weight:800;font-size:.85rem;color:var(--mut);margin-bottom:2px}
.metodo b{display:block;font-size:1.05rem}
.metodo span{color:var(--mut);font-size:.94rem}

.refs{display:grid;grid-template-columns:1.25fr 1fr;gap:18px}
.refs .panel{padding:clamp(16px,3vw,28px)}
.refs h3{font-size:1.2rem;margin-bottom:8px}
table{width:100%;border-collapse:collapse;font-size:.95rem}
th,td{text-align:left;padding:7px 10px;border-bottom:1px solid var(--line)}
th{font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--mut)}
tr:last-child td{border-bottom:0}
td:nth-child(2){font-family:'Cambria Math',Georgia,serif;font-style:italic}

/* ===== Páginas de tema (diseño Circuitos) ===== */
.hero{display:grid;grid-template-columns:1fr 1.2fr;gap:40px;align-items:center;padding:56px 5vw}
.hero.solo{grid-template-columns:1fr;max-width:1100px;margin:auto}
h1{font-size:clamp(2rem,4.5vw,3.6rem);line-height:1.05;font-weight:800;letter-spacing:-.02em}
.hero h1 small{display:block;font-size:.4em;font-weight:600;letter-spacing:0;color:var(--c);margin-bottom:6px}
.hero p{margin:18px 0;color:var(--mut);max-width:48ch}
.scope{background:#0F1A22;border-radius:var(--r);padding:14px;box-shadow:0 20px 50px rgba(18,32,43,.25);border:6px solid #1d2c37}
canvas{width:100%;height:260px;display:block}
.modes{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;align-items:center}
.modes button{background:#1d2c37;color:#cfe3ea;border:1px solid #2f4452;border-radius:99px;padding:6px 14px;font:inherit;cursor:pointer}
.modes button.on{background:#FFC857;color:#12202B;border-color:#FFC857}
.leg{margin-left:auto;font-size:.85rem;color:#9db3bd}.leg i{display:inline-block;width:10px;height:10px;border-radius:50%;margin:0 4px 0 10px}

main{padding:24px 5vw 60px;max-width:1100px;margin:auto}
main.home{padding:0 0 20px;max-width:none}
.fgrp{display:grid;gap:22px}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:clamp(18px,4vw,40px);animation:in .45s ease}
.fgrp .panel{animation-delay:calc(var(--i,0)*70ms);animation-fill-mode:backwards}
@keyframes in{from{opacity:0;transform:translateY(12px)}}
.panel h3{font-size:1.5rem;color:var(--c);margin:0 0 10px}
.panel h3 small{font-size:.8rem;font-weight:600;color:var(--mut);margin-left:8px}
.panel p{max-width:70ch}
.panel .nt{font-size:.92rem;color:var(--mut);margin-top:10px}
.two{display:grid;grid-template-columns:1fr;gap:6px}
.fg{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin-top:10px}
.f{border-left:5px solid var(--c);background:var(--paper);border-radius:0 10px 10px 0;padding:12px 16px;transition:transform .25s,box-shadow .25s}
.f:hover{transform:translateX(6px);box-shadow:0 6px 18px rgba(18,32,43,.12)}
.f span{display:block;font-size:.85rem;color:var(--mut);font-weight:600}
.f em{font:italic 1.25rem 'Cambria Math',Georgia,serif}
.fr{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;margin:0 .15em}
.f em .fr{display:inline-flex}
.f .fr span{display:block;font-size:inherit;color:inherit;font-weight:inherit;padding:0 .25em;text-align:center}
.f .fr span:first-child{border-bottom:1.5px solid currentColor}
.rev{opacity:0;transform:translateY(14px);transition:opacity .5s,transform .5s}
.rev.vis{opacity:1;transform:none}
.f.rev.vis:hover{transform:translateX(6px)}

.dg{display:block;width:100%;max-width:560px;height:auto;margin:10px 0;background:var(--paper);border-radius:10px}
.dg text{font:600 12px 'Bricolage Grotesque',system-ui,sans-serif;fill:var(--ink)}
.dg .s{fill:var(--card);stroke:var(--c);stroke-width:2.2}
.dg .w{fill:none;stroke:#6f8591;stroke-width:2}
.dg .f{fill:none;stroke:var(--c);stroke-width:3;stroke-linecap:round;stroke-dasharray:1 15;animation:flow 1s linear infinite}
@keyframes flow{to{stroke-dashoffset:-16}}

.exs{list-style:none;padding:0;display:grid;gap:14px;margin-top:14px}
.ex{border:1px solid var(--line);border-radius:12px;padding:14px 16px;transition:border-color .3s,background .3s}
.ex.full{border-left:5px solid var(--c)}
.ex.ok{border-color:var(--c);background:color-mix(in srgb,var(--c) 8%,var(--card))}
.ex.bad{border-color:#c62828}
.lv{font-size:.8rem;font-weight:700;padding:2px 10px;border-radius:99px;background:var(--paper);margin-right:8px}
.l1{color:#2e7d32}.l2{color:#b7791f}.l3{color:#c62828}.full.lv{color:var(--c)}
[data-th=dark] .l1{color:#6fcf75}[data-th=dark] .l2{color:#f0b84a}[data-th=dark] .l3{color:#ff7b72}
.ex p{margin-top:6px}
.ans{display:flex;gap:10px 16px;flex-wrap:wrap;align-items:center;margin-top:10px}
.ans label{font-weight:600}
input{border:1.5px solid var(--line);border-radius:9px;padding:7px 10px;font:inherit;width:110px;background:var(--card);color:var(--ink)}
input:focus{outline:2px solid var(--c);border-color:var(--c)}input.bad{border-color:#c62828}
button.b{background:var(--c);color:#fff;border:0;border-radius:9px;padding:8px 16px;font:inherit;font-weight:600;cursor:pointer}
[data-th=dark] button.b{color:#08141a}
.fb{font-weight:600;min-height:1.4em}
details{margin-top:6px}summary{cursor:pointer;font-weight:600;color:var(--c)}
.sl{margin-top:8px;padding:12px 14px;background:var(--paper);border-radius:10px;font-size:.95rem}
.sl p{margin:4px 0}.sl em{font:italic 1.05rem 'Cambria Math',Georgia,serif}

/* ===== Footer (el del home) ===== */
.foot{border-top:1px solid #1F3248;background:#0B1726;color:#EAF1FA;position:relative;margin-top:24px;font-family:'Space Grotesk',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif}
.foot::before{content:"";position:absolute;left:0;right:0;top:-1px;height:1px;background:linear-gradient(90deg,transparent,#F2B04A,transparent);opacity:.6}
.foot-in{width:min(1160px,100% - 40px);margin-inline:auto;display:flex;justify-content:space-between;align-items:center;gap:18px 30px;padding:28px 0;flex-wrap:wrap}
.foot-l{display:flex;align-items:center;gap:14px}
.foot-l p{display:flex;flex-direction:column;line-height:1.35;margin:0}
.foot-l b{font-size:.98rem}.foot-l span{font-size:.84rem;color:#93A9C2}
.foot-r{display:flex;align-items:center;gap:8px;color:#93A9C2;font-size:.9rem;margin:0}
.foot-r a{display:inline-flex;align-items:center;gap:5px;font-weight:700;color:#EAF1FA;padding:8px 14px;border:1px solid #2E4660;border-radius:99px;text-decoration:none;transition:.25s}
.foot-r a svg{width:16px;height:16px;transition:transform .25s}
.foot-r a:hover{color:#1b1202;background:#F2B04A;border-color:#F2B04A}
.foot-r a:hover svg{transform:translate(2px,-2px)}
.foot :focus-visible{outline-color:#F2B04A}

/* ===== Selector de placa, plataformas y ajustes móviles ===== */
.hh-txt,.dev{min-width:0}
.tabs{display:flex;gap:2px;padding:8px 8px 0;border-bottom:1px solid #1F3248}
.tabs button{flex:0 1 auto;min-height:40px;padding:8px 14px;font:600 .85rem 'Space Grotesk',system-ui,sans-serif;color:#93A9C2;background:none;border:0;border-bottom:2px solid transparent;cursor:pointer}
.tabs button:hover{color:#EAF1FA}
.tabs button[aria-selected=true]{color:#EAF1FA;border-bottom-color:#F2B04A}
.dev :focus-visible{outline-color:#F2B04A}
.boards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:18px}
.board{background:var(--card);border:1px solid var(--line);border-top:4px solid var(--c);border-radius:var(--r);padding:22px}
.board svg{width:44px;height:44px;fill:none;stroke:var(--c);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.board h3{font-size:1.3rem;color:var(--c);margin:8px 0 4px}
.board p{color:var(--mut);font-size:.96rem}
.board dl{margin:14px 0 0}
.board dl div{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-top:1px solid var(--line);font-size:.92rem}
.board dt{color:var(--mut)}.board dd{margin:0;font-weight:600;text-align:right}
.note{margin-top:18px;background:var(--card);border:1px solid var(--line);border-left:5px solid var(--br);border-radius:0 12px 12px 0;padding:16px 18px}
.note b{display:block;margin-bottom:2px}.note p{color:var(--mut);font-size:.95rem;max-width:80ch}
.note a{color:var(--br);font-weight:600}
.refs .panel{overflow-x:auto}
@media(max-width:520px){
 .wrap,.hh-in{width:calc(100% - 32px)}
 .hh h1{font-size:2rem}
 .tabs{padding-inline:4px}.tabs button{flex:1;padding-inline:6px}
 .dev pre{font-size:.78rem}
 .dev code{min-width:0}
 .l{white-space:pre-wrap;overflow-wrap:anywhere;padding:0 12px}
 .board{padding:18px}
}
@media(max-width:480px){.facts{grid-template-columns:1fr;gap:10px}.facts li{display:flex;gap:14px;align-items:baseline}.facts b{flex:0 0 5.6rem}}
@media(max-width:360px){.hh h1{font-size:1.8rem}.btn{padding:12px 16px}}

/* ===== Responsive ===== */
@media(max-width:1020px){
 .burger{display:block}
 .top nav{position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:2px;padding:12px 20px 18px;background:#0B1726;border-bottom:1px solid #1F3248;transform:translateY(-8px);opacity:0;visibility:hidden;transition:.25s}
 .top nav.open{transform:none;opacity:1;visibility:visible}
 .top nav a{padding:13px 16px;border-radius:12px;font-size:1.02rem}
}
@media(max-width:800px){
 .hero{grid-template-columns:1fr}
 .refs{grid-template-columns:1fr}
}
@media(max-width:520px){
 .top{padding-inline:16px}
 .brand-t b{font-size:.95rem}.mark{width:38px;height:38px}
 .btns .btn{flex:1 1 100%;justify-content:center}
 .temas{grid-template-columns:1fr}
 .foot-in{flex-direction:column;align-items:flex-start}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.rev{opacity:1;transform:none}}
@media print{.top,.hero,.hh,.foot,.skip{display:none!important}body{background:#fff}.rev{opacity:1;transform:none}.sl{display:block}}