/* Total Engineering · MCU Lab */
:root{--bg:#fff8ef;--card:#fff;--ink:#1d2433;--sub:#5b6577;--line:#ece3d6;--orange:#ff7a1a;--pink:#ff4f7b;--violet:#7c5cff;--teal:#00a6a6;--green:#18b85a;--red:#e5384f;--yellow:#ffc531;--bc:#0e8f98;--ba:#33d1d8;--r:16px;--sh:0 6px 0 rgba(29,36,51,.08),0 12px 28px rgba(29,36,51,.08)}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body.mcu{margin:0;background:var(--bg);background-image:radial-gradient(circle at 10% 0,#ffe7cf 0,transparent 40%),radial-gradient(circle at 95% 10%,#e7e2ff 0,transparent 35%);color:var(--ink);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;overflow-x:hidden}
a{color:#d4570a}
code,kbd,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em}
code{background:#fff0e0;border-radius:6px;padding:.05em .35em}
[hidden]{display:none!important}

/* cabecera */
.mcu-top{display:flex;align-items:center;gap:12px;padding:10px 16px;background:#fff;border-bottom:3px solid var(--ink);position:sticky;top:0;z-index:20;flex-wrap:wrap}
.mcu-brand{display:flex;align-items:center;gap:8px;color:var(--ink);text-decoration:none;font-weight:700;font-size:.9rem}
.mcu-title{font-size:1.35rem;font-weight:900;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
.mcu-title b{color:var(--orange)}
.mcu-logo{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--yellow);border:2px solid var(--ink);font-size:16px;vertical-align:-4px}
.mcu-top-actions{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}

/* botones */
.mcu-btn{display:inline-flex;align-items:center;gap:6px;border:2px solid var(--ink);background:#fff;color:var(--ink);border-radius:12px;padding:8px 14px;font:inherit;font-weight:700;font-size:.92rem;cursor:pointer;text-decoration:none;box-shadow:0 3px 0 var(--ink);transition:transform .08s,box-shadow .08s;touch-action:manipulation}
.mcu-btn:hover{transform:translateY(-1px)}
.mcu-btn:active{transform:translateY(2px);box-shadow:0 1px 0 var(--ink)}
.mcu-btn:disabled{opacity:.45;cursor:default;transform:none}
.mcu-btn.primary{background:var(--orange);color:#fff}
.mcu-btn.check{background:var(--green);color:#fff}
.mcu-btn.ghost{box-shadow:none;border-color:var(--line);background:#fff}
.mcu-btn.big{font-size:1.15rem;padding:12px 24px}
.mcu-mini{border:1.5px solid var(--line);background:#fff;border-radius:8px;padding:3px 9px;font:inherit;font-size:.82rem;cursor:pointer;color:var(--ink)}
.mcu-mini:hover{border-color:var(--ink)}
.mcu-btn:focus-visible,.mcu-mini:focus-visible,.mcu-bcard:focus-visible,.mcu-lcard:focus-visible{outline:3px solid var(--violet);outline-offset:2px}

.mcu-main{max-width:1240px;margin:0 auto;padding:18px 16px 30px}

/* inicio */
.mcu-hero{display:flex;gap:18px;align-items:center;justify-content:space-between;flex-wrap:wrap;margin:6px 0 20px}
.mcu-hero h1{font-size:clamp(1.7rem,4.5vw,2.6rem);line-height:1.1;margin:0 0 8px;letter-spacing:-.03em}
.mcu-hero h1 span{background:linear-gradient(90deg,var(--orange),var(--pink),var(--violet));-webkit-background-clip:text;background-clip:text;color:transparent}
.mcu-hero p{max-width:720px;margin:0;color:var(--sub)}
.mcu-hero-stars{background:var(--yellow);border:2px solid var(--ink);border-radius:var(--r);padding:10px 16px;box-shadow:0 4px 0 var(--ink);text-align:center}
.mcu-hero-stars span{display:block;font-size:1.5rem;font-weight:900}
.mcu-hero-stars small{font-size:.75rem}
.mcu-boards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.mcu-bcard{display:flex;flex-direction:column;gap:6px;background:#fff;border:2px solid var(--ink);border-radius:20px;padding:16px;color:var(--ink);text-decoration:none;box-shadow:0 5px 0 var(--bc);transition:transform .12s;position:relative;overflow:hidden;min-width:0}
.mcu-bcard::after{content:"";position:absolute;right:-30px;top:-30px;width:100px;height:100px;border-radius:50%;background:var(--ba);opacity:.18}
.mcu-bcard:hover{transform:translateY(-3px) rotate(-.4deg)}
.mcu-chipico{width:64px;height:40px}
.mcu-bname{font-weight:900;font-size:1.2rem}
.mcu-bmeta{font-size:.88rem;color:var(--sub)}
.mcu-bmeta b{color:var(--bc)}
.mcu-bfocus{font-size:.9rem}
.mcu-bprog{height:10px;border-radius:6px;background:#f1ebe2;overflow:hidden;margin-top:auto}
.mcu-bprog i{display:block;height:100%;background:linear-gradient(90deg,var(--yellow),var(--orange))}
.mcu-bstars{font-size:.82rem;font-weight:700;color:#a46a00}

/* placa */
.mcu-crumbs{font-size:.9rem;color:var(--sub);margin-bottom:10px}
.mcu-crumbs a{font-weight:700}
.mcu-binfo{background:#fff;border:2px solid var(--ink);border-radius:20px;padding:18px;box-shadow:0 5px 0 var(--bc)}
.mcu-binfo-head{display:flex;gap:14px;align-items:center}
.mcu-binfo-head .mcu-chipico{width:84px;height:52px;flex:none}
.mcu-binfo h2{margin:0;font-size:1.6rem}
.mcu-binfo-head p{margin:2px 0 0;color:var(--sub)}
.mcu-specs{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:10px;margin:16px 0}
.mcu-specs div{background:#fbf7f1;border-radius:12px;padding:8px 12px;min-width:0}
.mcu-specs dt{font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;color:var(--sub);font-weight:700}
.mcu-specs dd{margin:0;font-weight:600}
.mcu-warn{display:inline-block;background:#ffe2e6;color:var(--red);border-radius:6px;padding:0 6px;font-size:.8rem}
.mcu-use,.mcu-focus{margin:6px 0}
.mcu-h2{margin:24px 0 10px}
.mcu-lessons{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.mcu-lcard{display:flex;align-items:center;gap:12px;background:#fff;border:2px solid var(--line);border-radius:16px;padding:12px 14px;color:var(--ink);text-decoration:none;transition:border-color .1s,transform .1s;min-width:0}
.mcu-lcard:hover{border-color:var(--ink);transform:translateY(-2px)}
.mcu-lcard.done{border-color:#ffd77a;background:#fffaf0}
.mcu-lnum{flex:none;width:28px;height:28px;border-radius:50%;background:var(--bc);color:#fff;display:grid;place-items:center;font-weight:800;font-size:.85rem}
.mcu-lemoji{font-size:1.5rem;flex:none}
.mcu-ltitle{flex:1;font-weight:700;min-width:0}
.mcu-ltitle small{display:block;font-weight:600;color:var(--sub);font-size:.78rem}
.mcu-lstars{color:#f2a900;font-size:1.05rem;letter-spacing:1px;flex:none}
.mcu-lstars.big{font-size:1.4rem}

/* lección */
.mcu-lhead{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.mcu-lhead h2{margin:0;font-size:clamp(1.3rem,3.4vw,1.8rem);letter-spacing:-.02em}
.mcu-kind{background:var(--violet);color:#fff;border-radius:999px;padding:2px 10px;font-size:.78rem;font-weight:800}
.mcu-lgrid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:18px;align-items:start}
.mcu-lgrid.solo{grid-template-columns:minmax(0,1fr)}
.mcu-lgrid.solo .mcu-col-a{max-width:820px}
.mcu-col-a,.mcu-col-b{min-width:0;display:flex;flex-direction:column;gap:14px}
.mcu-explain{background:#fff;border:2px solid var(--line);border-radius:var(--r);padding:4px 18px}
.mcu-explain pre{background:#1d2433;color:#e8f0ff;border-radius:10px;padding:10px 12px;overflow:auto;font-size:.82rem}
.mcu-explain details{margin:0 0 12px}
.mcu-explain summary{cursor:pointer;font-weight:700;color:#d4570a}
.mcu-goal{background:#fff4c2;border:2px solid var(--ink);border-radius:var(--r);padding:12px 16px;box-shadow:0 4px 0 var(--yellow)}
.mcu-hint{background:#eef6ff;border-radius:12px;padding:10px 14px;border-left:5px solid #3f8cff}
.mcu-code{background:#fff;border:2px solid var(--ink);border-radius:var(--r);padding:12px;box-shadow:var(--sh);display:flex;flex-direction:column;gap:10px}
.mcu-modes{display:flex;gap:6px;flex-wrap:wrap;background:#f6f0e7;border-radius:12px;padding:4px}
.mcu-modes button{flex:1;border:0;background:transparent;border-radius:9px;padding:8px 10px;font:inherit;font-weight:800;cursor:pointer;color:var(--sub);min-width:0}
.mcu-modes button.on{background:#fff;color:var(--ink);box-shadow:0 2px 0 rgba(0,0,0,.12)}
.mcu-toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.mcu-spacer{flex:1}
.mcu-blockly{height:440px;border-radius:12px;overflow:hidden;border:1.5px solid var(--line);touch-action:none}
.mcu-loading{margin:0;color:var(--sub)}
.mcu-blockly .blocklyToolboxDiv{background:#f6f0e7}
.mcu-blockly .blocklyTreeLabel{font:700 13px system-ui,sans-serif}
.mcu-gen summary{cursor:pointer;font-size:.88rem;color:var(--sub);font-weight:700}
.mcu-gen pre,.mcu-pyc{background:#1d2433;color:#e8f0ff;border-radius:10px;padding:10px 12px;overflow:auto;font-size:.8rem;max-height:280px;margin:8px 0 0}
.mcu-text-wrap{display:flex;flex-direction:column;gap:8px;align-items:flex-start}
.mcu-text-wrap>textarea{width:100%;min-height:320px;font-family:ui-monospace,Consolas,monospace}
.mcu-text-wrap .CodeMirror{width:100%;height:auto;min-height:300px;border:1.5px solid var(--line);border-radius:12px;font-size:14px}
.mcu-text-wrap .CodeMirror-scroll{min-height:300px}
.mcu-errline{background:#ffe1e5!important}
.mcu-note{margin:0;background:#f3efff;border-radius:10px;padding:8px 12px;font-size:.88rem}
.mcu-err{background:#ffe8eb;border:2px solid var(--red);color:#7a0d1c;border-radius:12px;padding:10px 12px;font-size:.92rem}
.mcu-warnbox{background:#fff6dc;border-radius:12px;padding:8px 12px;font-size:.86rem}

/* escenario */
.mcu-stage{background:#fff;border:2px solid var(--ink);border-radius:var(--r);padding:12px;box-shadow:var(--sh)}
.mcu-stage-head{display:flex;gap:8px;align-items:center;font-size:.88rem;font-weight:700;margin-bottom:6px}
.mcu-clock{margin-left:auto;font-family:ui-monospace,Consolas,monospace;background:#f6f0e7;border-radius:6px;padding:1px 8px}
.mcu-stage-svg{background:repeating-linear-gradient(0deg,#fbf8f3 0 19px,#f1ebe1 19px 20px),repeating-linear-gradient(90deg,transparent 0 19px,#f1ebe1 19px 20px);border-radius:12px}
.mcu-svg{display:block;width:100%;height:auto;user-select:none;-webkit-user-select:none}
.mcu-chiptxt{fill:#fff;font:800 13px system-ui,sans-serif}
.mcu-chipsub{fill:#9aa3b2;font:600 8px system-ui,sans-serif}
.mcu-boardtxt{fill:#fff;font:800 11px system-ui,sans-serif;opacity:.85}
.mcu-tiny{fill:#5b6577;font:700 9px system-ui,sans-serif}
.mcu-pad{fill:#fff;stroke:#1d2433;stroke-width:1.5}
.mcu-padtxt{fill:#1d2433;font:800 10px ui-monospace,Consolas,monospace}
.mcu-wire{stroke-width:4;fill:none;stroke-linecap:round;opacity:.85}
.mcu-plabel{fill:#1d2433;font:700 11px system-ui,sans-serif}
.mcu-btn .cap,.mcu-btn{cursor:pointer}
g.mcu-btn,g.mcu-touch,g.mcu-pot{cursor:pointer;touch-action:none;outline:none}
g.mcu-btn .cap{transition:r .05s}
g.mcu-btn.down .cap{fill:#b3192b}
g.mcu-btn:focus-visible rect,g.mcu-touch:focus-visible circle{stroke:var(--violet);stroke-width:3}
g.mcu-touch.down circle{fill:#ffcf5a}
.mcu-servo .horn{transition:transform .12s}
.mcu-servo .deg,.mcu-buzz .hz{fill:#5b6577;font:700 10px system-ui,sans-serif}
.mcu-float{margin:8px 0 0;font-size:.85rem;background:#fff1d6;border-radius:8px;padding:6px 10px}
.mcu-controls{display:flex;flex-direction:column;gap:8px;margin-top:10px}
.mcu-ctl{display:grid;grid-template-columns:minmax(0,1fr) 3.5em;gap:2px 10px;align-items:center;font-size:.88rem;font-weight:700}
.mcu-ctl span{grid-column:1/-1}
.mcu-ctl input{width:100%;accent-color:var(--orange)}
.mcu-ctl output{font-family:ui-monospace,Consolas,monospace;text-align:right}
.mcu-phone{border:3px solid var(--ink);border-radius:22px;padding:10px 12px 14px;background:linear-gradient(#fdfcff,#eef2ff);max-width:300px;width:100%;align-self:center;text-align:center}
.mcu-phone-bar{font-size:.72rem;background:#1d2433;color:#cfe;border-radius:8px;padding:3px 8px;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mcu-phone p{margin:10px 0 6px;font-weight:800}
.mcu-phone-btns{display:flex;gap:8px;justify-content:center}
.mcu-phone-btns button{flex:1;border:2px solid var(--ink);border-radius:14px;padding:10px 6px;font:inherit;font-weight:800;background:#fff;cursor:pointer}
.mcu-phone-btns button:first-child{background:var(--yellow)}
.mcu-phone-btns small{display:block;font-weight:600;font-size:.72rem;color:var(--sub)}
.mcu-phone-log{font-size:.75rem;color:var(--sub);margin-top:8px;min-height:1.2em}

.mcu-serial-box{background:#1d2433;border-radius:var(--r);padding:10px;color:#e8f0ff}
.mcu-serial-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px;font-size:.9rem}
.mcu-serial{margin:0;height:150px;overflow:auto;background:#121826;border-radius:10px;padding:8px 10px;font-size:.82rem;white-space:pre-wrap;word-break:break-word;color:#9ff0c6}
.mcu-serial-form{display:flex;gap:6px;margin-top:8px}
.mcu-serial-form input{flex:1;min-width:0;border-radius:8px;border:1px solid #3a4560;background:#121826;color:#fff;padding:6px 8px;font:inherit;font-size:.88rem}

.mcu-results>div{border:2px solid var(--ink);border-radius:var(--r);padding:12px 14px}
.mcu-results ul{margin:8px 0;padding-left:0;list-style:none;font-size:.92rem}
.mcu-results li{margin:4px 0}
.mcu-win{background:#e6fbe9;box-shadow:0 4px 0 var(--green)}
.mcu-lose{background:#fff0f0;box-shadow:0 4px 0 var(--pink)}
.mcu-wait{margin:0;padding:10px 14px;background:#f3efff;border-radius:12px}
.mcu-bad{margin:0;padding:10px 14px;background:#ffe8eb;border-radius:12px}
.mcu-bigstars{display:block;font-size:2rem;color:#f2a900;letter-spacing:3px;line-height:1.1}
.mcu-sub{color:var(--sub);font-size:.86rem}

/* juegos */
.mcu-game{min-width:0}
.mcu-quiz,.mcu-widget{background:#fff;border:2px solid var(--ink);border-radius:20px;padding:18px;box-shadow:0 5px 0 var(--violet)}
.mcu-qstart,.mcu-qend{text-align:center}
.mcu-qhead{display:flex;justify-content:space-between;font-weight:800;font-size:.9rem;color:var(--sub)}
.mcu-qscore{color:var(--violet)}
.mcu-qbar{height:8px;background:#efe9ff;border-radius:6px;overflow:hidden;margin:8px 0 14px}
.mcu-qbar i{display:block;height:100%;background:linear-gradient(90deg,var(--green),var(--yellow),var(--red));transform-origin:left;animation:mcu-shrink linear forwards}
@keyframes mcu-shrink{from{transform:scaleX(1)}to{transform:scaleX(0)}}
.mcu-q{font-size:1.15rem;font-weight:800;margin:0 0 14px}
.mcu-qicon{font-size:1.8rem;margin-right:8px;vertical-align:-4px}
.mcu-opts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.mcu-opts button{border:2px solid var(--ink);border-radius:14px;background:#fbf7f1;padding:12px;font:inherit;font-weight:700;cursor:pointer;box-shadow:0 3px 0 var(--ink);text-align:center;min-width:0;overflow-wrap:anywhere}
.mcu-opts button:hover:not(:disabled){background:#fff4c2}
.mcu-opts button.right{background:#bff3cd}
.mcu-opts button.wrong{background:#ffc9d1}
.mcu-opts button:disabled{cursor:default}
.mcu-why{margin-top:14px;background:#f6f0e7;border-radius:12px;padding:10px 12px}
.mcu-why .mcu-btn{margin-top:8px;display:flex;width:max-content}
.mcu-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;justify-content:center;margin-top:10px}
.mcu-wtitle{margin:0 0 12px;font-size:1.02rem}
.mcu-reg{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:6px}
.mcu-bit{border:2px solid var(--ink);border-radius:10px;background:#fbf7f1;padding:6px 0;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:2px;font:inherit;min-width:0}
.mcu-bit b{font-size:1.2rem}
.mcu-bit small{font-size:.68rem;color:var(--sub);font-weight:700}
.mcu-bitled{width:16px;height:16px;border-radius:50%;background:#d8d2c8;border:1.5px solid #8a8378}
.mcu-bit.on{background:#fff4c2}
.mcu-bit.on .mcu-bitled{background:#ffd23f;box-shadow:0 0 10px #ffc400}
.mcu-regval{text-align:center;margin:12px 0 0;overflow-wrap:anywhere}
.mcu-regval span{color:var(--sub);font-family:ui-monospace,Consolas,monospace;font-size:.85rem}
.mcu-wmsg{font-size:.9rem;color:var(--red);font-weight:700}
.mcu-timer{display:flex;gap:10px;flex-wrap:wrap}
.mcu-timer label{display:flex;flex-direction:column;font-weight:800;font-size:.85rem;flex:1;min-width:90px}
.mcu-timer input{border:2px solid var(--ink);border-radius:10px;padding:8px;font:inherit;font-weight:700;width:100%}
.mcu-formula{font-size:.92rem;overflow-wrap:anywhere}
.mcu-tled{width:26px;height:26px;border-radius:50%;background:#ffd23f;border:2px solid var(--ink);animation:mcu-blink 1s steps(1) infinite}
.mcu-tled.fast{animation:none;opacity:.6}
@keyframes mcu-blink{50%{background:#5a5446}}
.mcu-pio{background:#1d2433;color:#e8f0ff;border-radius:10px;padding:10px 12px;font-size:.88rem;margin:12px 0 6px;white-space:pre}
.mcu-pio b{color:var(--yellow)}
.mcu-wave{width:100%;height:auto;background:#121826;border-radius:10px}

.mcu-pager{display:flex;justify-content:space-between;gap:10px;margin-top:22px;flex-wrap:wrap}
.mcu-pager a{max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* confeti */
.mcu-confetti{position:fixed;inset:0;pointer-events:none;z-index:50;overflow:hidden}
.mcu-confetti span{position:absolute;top:-40px;font-size:28px;animation:mcu-fall 1.8s ease-in forwards}
@keyframes mcu-fall{to{transform:translateY(110vh) rotate(540deg)}}
@media (prefers-reduced-motion:reduce){.mcu-confetti,.mcu-tled{animation:none!important}.mcu-confetti{display:none}.mcu-bcard,.mcu-lcard{transition:none}}

/* texto educativo y pie */
.mcu-learn{max-width:1240px;margin:10px auto 0;padding:24px 16px}
.mcu-learn h2{font-size:1.6rem;margin:0 0 8px}
.mcu-learn-lead{color:var(--sub);max-width:860px}
.mcu-learn-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px;margin-top:14px}
.mcu-learn-grid section{background:#fff;border:2px solid var(--line);border-radius:var(--r);padding:4px 16px}
.mcu-learn-grid h3{margin:12px 0 4px}
.mcu-learn-grid p{font-size:.94rem}
.mcu-ad{max-width:1240px;margin:20px auto 0;padding:0 16px;min-height:0}
.mcu-ad span{display:block;font-size:.7rem;color:#a39a8d;text-transform:uppercase;letter-spacing:.08em;border-top:1px dashed var(--line);padding-top:6px}
.mcu-foot{text-align:center;padding:24px 16px 40px;color:var(--sub);font-size:.88rem}

@media (max-width:900px){
 .mcu-lgrid{grid-template-columns:minmax(0,1fr)}
 .mcu-col-b{order:0}
 .mcu-blockly{height:400px}
}
@media (max-width:560px){
 .mcu-top{padding:8px 12px;gap:8px}
 .mcu-brand span{display:none}
 .mcu-top-actions .mcu-btn{padding:5px 9px;font-size:.8rem}
 .mcu-main{padding:12px 12px 24px}
 .mcu-boards,.mcu-lessons{grid-template-columns:minmax(0,1fr)}
 .mcu-explain{padding:2px 14px}
 .mcu-toolbar .mcu-btn{padding:7px 10px;font-size:.86rem}
 .mcu-opts{grid-template-columns:minmax(0,1fr)}
 .mcu-reg{gap:3px}
 .mcu-bit b{font-size:1rem}
 .mcu-learn-grid{grid-template-columns:minmax(0,1fr)}
 .mcu-blockly{height:380px}
 .mcu-blockly .blocklyTreeLabel{font-size:11px}
 .mcu-blockly .blocklyTreeRow{height:28px;line-height:28px;padding-right:4px!important;margin-bottom:1px}
 .mcu-blockly .blocklyTreeRowContentContainer{padding:0}
}