/* Layout: editor de código a la izquierda, "escenario" animado + consola a la derecha, explicación debajo. Paleta: azul y amarillo de Python sobre neutros fríos. */
:root{
  --bg:#eef2f7; --surface:#ffffff; --ink:#132033; --muted:#5a6a80; --line:#d3dbe6;
  --blue:#2c6aa3; --yellow:#c99a00; --ysoft:rgba(255,212,59,.45);
  --ok:#24804f; --oksoft:rgba(36,128,79,.16); --err:#c03a2b; --errsoft:rgba(192,58,43,.14); --warn:#b86a00;
  --code-bg:#0f1b2b; --code-ink:#dbe5f1; --code-muted:#6f839c; --code-hl:rgba(255,212,59,.13);
  --kw:#7fb4f0; --str:#ffd43b; --com:#6f839c; --dec:#f59e6b; --num:#9fe0b5;
  --display:"Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --body:"IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono:"JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0b121c; --surface:#131e2d; --ink:#e4ecf5; --muted:#8b9cb2; --line:#25364c;
  --blue:#72aee6; --yellow:#ffd43b; --ysoft:rgba(255,212,59,.3);
  --ok:#4cc483; --oksoft:rgba(76,196,131,.16); --err:#f07563; --errsoft:rgba(240,117,99,.16); --warn:#f0a94a;
  --code-bg:#08101a; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0b121c; --surface:#131e2d; --ink:#e4ecf5; --muted:#8b9cb2; --line:#25364c;
  --blue:#72aee6; --yellow:#ffd43b; --ysoft:rgba(255,212,59,.3);
  --ok:#4cc483; --oksoft:rgba(76,196,131,.16); --err:#f07563; --errsoft:rgba(240,117,99,.16); --warn:#f0a94a;
  --code-bg:#08101a; color-scheme:dark}

*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.55;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:20px 40px}
.wrap{max-width:1180px;margin:0 auto;display:flex;flex-direction:column;gap:18px}
.lesson-header{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:14px}
h1{font-family:var(--display);font-weight:800;font-size:clamp(26px,4vw,38px);line-height:1.05;margin:0;letter-spacing:-.01em;text-wrap:balance}
h1 span{color:var(--blue)}
.sub{color:var(--muted);margin:6px 0 0;max-width:60ch}
.tabs{display:flex;gap:4px;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:4px}
.tab{font:600 14px var(--body);border:0;background:transparent;color:var(--muted);padding:8px 16px;border-radius:999px;cursor:pointer}
.tab[aria-pressed="true"]{background:var(--blue);color:#fff}
:root[data-theme="dark"] .tab[aria-pressed="true"]{color:#08101a}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .tab[aria-pressed="true"]{color:#08101a}}
button:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}

.steps{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;scrollbar-width:thin}
.chip{flex:0 0 auto;font:500 13px var(--body);border:1px solid var(--line);background:var(--surface);color:var(--muted);border-radius:8px;padding:6px 10px;cursor:pointer;display:flex;gap:6px;align-items:center}
.chip b{font-family:var(--mono);font-size:11px;color:var(--muted)}
.chip.done{color:var(--ink)}
.chip[aria-current="step"]{border-color:var(--yellow);box-shadow:0 0 0 2px var(--ysoft);color:var(--ink)}

.grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:16px}
@media (max-width:860px){.grid{grid-template-columns:minmax(0,1fr)}}
.panel{min-width:0;border-radius:12px;border:1px solid var(--line);background:var(--surface);overflow:hidden;display:flex;flex-direction:column}
.ptitle{font:600 11px var(--body);letter-spacing:.09em;text-transform:uppercase;color:var(--muted);padding:10px 14px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between}
.code{background:var(--code-bg);border-color:transparent}
.code .ptitle{color:var(--code-muted);border-color:rgba(255,255,255,.07)}
pre{margin:0;padding:12px 0;overflow-x:auto;font:13px/1.65 var(--mono);color:var(--code-ink);flex:1}
.ln{display:block;padding:0 14px 0 0;white-space:pre;transition:background .25s;border-left:3px solid transparent}
.ln i{display:inline-block;width:34px;text-align:right;margin-right:14px;color:#3e5068;font-style:normal;user-select:none}
.ln.hl{background:var(--code-hl);border-left-color:#ffd43b}
.ln.hl i{color:#ffd43b}
.kw{color:var(--kw)} .st{color:var(--str)} .cm{color:var(--com);font-style:italic} .dc{color:var(--dec)} .nu{color:var(--num)}

.right{display:flex;flex-direction:column;gap:16px;min-width:0}
.stage{min-height:290px;padding:22px 16px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
  background-image:radial-gradient(var(--line) 1px,transparent 1px);background-size:18px 18px;overflow-x:auto}
.console{background:var(--code-bg);border-color:transparent}
.console .ptitle{color:var(--code-muted);border-color:rgba(255,255,255,.07)}
.out{font:13px/1.6 var(--mono);color:var(--code-ink);padding:10px 14px;min-height:96px;overflow-x:auto}
.out div{white-space:pre;animation:pop .3s ease-out}
.out .e{color:#ff8a78} .out .w{color:#ffc46b} .out .k{color:#7fe0a6}
.out .ph{color:var(--code-muted);font-style:italic;animation:none}

.note{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;align-items:start;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px}
@media (max-width:640px){.note{grid-template-columns:minmax(0,1fr)}}
.note h2{font-family:var(--display);font-weight:600;font-size:22px;margin:0 0 6px;text-wrap:balance}
.note p{margin:0 0 8px;max-width:68ch}
.note code{font-family:var(--mono);font-size:.88em;background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:0 4px}
.tip{border-left:3px solid var(--yellow);padding:6px 10px;background:var(--bg);border-radius:0 6px 6px 0;font-size:14px}
.controls{display:flex;gap:8px;flex-wrap:wrap}
.btn{font:600 14px var(--body);border:1px solid var(--line);background:var(--bg);color:var(--ink);padding:9px 14px;border-radius:8px;cursor:pointer;white-space:nowrap}
.btn.main{background:var(--yellow);border-color:var(--yellow);color:#14202e}
.btn:disabled{opacity:.4;cursor:default}
.count{font:12px var(--mono);color:var(--muted);align-self:center;font-variant-numeric:tabular-nums}

/* --- piezas del escenario --- */
.fx{transition:opacity .35s,border-color .3s,box-shadow .3s,background .3s,transform .3s}
.ghost:not(.on){opacity:.16}
.row{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}
.col{display:flex;flex-direction:column;align-items:center;gap:8px}
.nm{font:600 13px var(--mono);color:var(--blue);border:1.5px solid var(--blue);border-radius:999px;padding:3px 11px;background:var(--surface)}
.ar{font:14px var(--mono);color:var(--muted);white-space:nowrap}
.ar small{display:block;font:11px var(--body);text-align:center}
.box{border:1.5px solid var(--line);background:var(--surface);border-radius:10px;padding:9px 12px;font:13px/1.5 var(--mono);display:flex;flex-direction:column;gap:5px}
.lbl{font:600 10.5px var(--body);letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}
.line{padding:2px 8px;border-radius:5px;border:1.5px solid transparent;white-space:nowrap}
.cur{border-color:var(--yellow)!important;box-shadow:0 0 0 4px var(--ysoft)}
.hit{border-color:var(--ok)!important;background:var(--oksoft)!important}
.miss{border-color:var(--err)!important;background:var(--errsoft)!important}
.warn{border-color:var(--warn)!important;color:var(--warn)}
.shadow{opacity:.4;text-decoration:line-through}
.run{animation:run .7s ease-out}
.big{font:600 26px var(--mono);text-align:center;font-variant-numeric:tabular-nums}
.inner{border-style:dashed}
.machine{border-color:var(--blue);border-width:2px}
.eq{font:800 30px var(--display);color:var(--yellow)}
.seq{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px;max-width:420px}
.seq li{display:flex;gap:10px;align-items:baseline;font-size:14px;border:1.5px solid var(--line);background:var(--surface);border-radius:8px;padding:6px 10px}
.seq li b{font:600 12px var(--mono);color:var(--muted)}
.seq code,.cap code{font-family:var(--mono);font-size:.9em}
.cap{font-size:13px;color:var(--muted);text-align:center}
.cls{min-width:220px;padding:0;gap:0;overflow:hidden}
.cname{font:600 14px var(--mono);padding:7px 12px;border-bottom:1.5px solid var(--line);display:flex;justify-content:space-between;gap:10px}
.cname em{font:500 11px var(--body);color:var(--muted);font-style:normal}
.cls ul{list-style:none;margin:0;padding:6px 6px;display:flex;flex-direction:column;gap:2px}
.cls ul+ul{border-top:1px dashed var(--line)}
.cls li{padding:1px 8px;border-radius:5px;border:1.5px solid transparent;font-size:12.5px;white-space:nowrap}
.cls li.m{color:var(--blue)}
.parent .cname{background:var(--bg)}
.child{border-color:var(--blue)}
.child .cname{color:var(--blue)}
.link{font:600 12px var(--body);color:var(--muted);display:flex;flex-direction:column;align-items:center;line-height:1.1}
.link span{font-size:18px;color:var(--blue)}
.kv{display:grid;grid-template-columns:auto auto;gap:1px 12px;font-size:12.5px}
.kv span:nth-child(odd){color:var(--muted)}
.tag{font:600 11px var(--body);padding:3px 9px;border-radius:999px;border:1px solid var(--line);color:var(--muted)}
.step-summary{border:1px solid var(--line);border-left:4px solid var(--yellow);border-radius:10px;background:var(--surface);padding:14px 18px}
.step-summary p{margin:5px 0 0;font-size:16px;line-height:1.55;overflow-wrap:anywhere}
@keyframes run{0%{transform:scale(1)}35%{transform:scale(1.06);box-shadow:0 0 0 8px var(--ysoft)}100%{transform:scale(1)}}
@keyframes pop{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}

body{margin:0;padding:0 16px 32px} .site-header{max-width:1180px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:18px 0;gap:16px}.brand-logo{width:156px;height:auto}.site-header nav{display:flex;gap:14px;flex-wrap:wrap}.site-header a,.breadcrumb a{color:var(--blue)}.lesson-header{padding:12px 0}.eyebrow{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--blue);font-weight:600}.playback{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.playback label{display:flex;align-items:center;gap:8px}select{padding:9px;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:8px}#event-status{font-size:12px;color:var(--muted)}.practice{padding:24px}.practice h2{font:600 clamp(22px,3vw,28px) var(--display);margin:6px 0}.practice h3{margin:0 0 8px}.practice p{max-width:80ch}.lab-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.experiment{min-width:0;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:20px}.experiment label{display:block;margin:12px 0}.experiment input[type=range]{width:100%;accent-color:var(--blue)}.experiment pre{padding:14px;background:var(--code-bg);border-radius:8px;font-size:12px;white-space:pre-wrap;overflow-wrap:anywhere}.flow{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0;color:var(--blue)}button[aria-pressed=true]{box-shadow:0 0 0 2px var(--blue)}.reference-content{max-width:1180px;margin:24px auto;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.reference-content a{color:var(--blue)}.reference-links{display:flex;gap:12px;flex-wrap:wrap}.reference-byline{color:var(--muted);font-size:13px}.site-footer{max-width:1180px;margin:24px auto;color:var(--muted)}.skip-link{position:absolute;left:16px;top:-80px}.skip-link:focus{top:4px;background:var(--surface);z-index:5}input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--yellow);outline-offset:3px}@media(max-width:640px){.lab-grid{grid-template-columns:1fr}.site-header{align-items:flex-start;flex-direction:column}.practice{padding:16px}.controls .btn{white-space:normal}.note{padding:16px}.steps{max-width:100%}.tabs{flex-wrap:wrap}.kv{grid-template-columns:auto}.stage .row{min-width:0}}pre{position:relative}.cap{max-width:100%;overflow-wrap:anywhere}

.lab-single{grid-template-columns:minmax(0,1fr)}
.related-lesson a{color:var(--blue);font-weight:600}
@media(min-width:861px){
  .grid{gap:14px}
  .grid .stage{min-height:255px;padding:18px 14px;gap:14px}
  .grid .note{padding:15px 17px;gap:12px;font-size:14px}
  .grid .note h2{font-size:20px}
  .grid .note .btn{font-size:13px;padding:8px 12px}
  .grid .out{min-height:84px}
  .grid>.right{display:contents}
  .grid>.code{grid-column:1;grid-row:1 / 4}
  .grid>.right>.panel:not(.console){grid-column:2;grid-row:1}
  .grid>.note{grid-column:2;grid-row:2;grid-template-columns:minmax(0,1fr)}
  .grid>.right>.console{grid-column:2;grid-row:3}
  [data-lesson="her"] .stage{min-height:235px;padding:14px 12px;gap:10px}
  [data-lesson="her"] .stage .box{font-size:12px;line-height:1.4}
  [data-lesson="her"] .stage .cls{min-width:205px}
  [data-lesson="her"] .stage .cname{font-size:13px;padding:6px 10px;gap:8px}
  [data-lesson="her"] .stage .cls ul{padding:4px 5px;gap:0}
  [data-lesson="her"] .stage .cls li{font-size:12px;padding:0 6px}
  [data-lesson="her"] .stage .link{font-size:11px}
  [data-lesson="her"] .stage .link span{font-size:15px}
}
.uses-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:16px 0}
.use-card{min-width:0;padding:18px;border:1px solid var(--line);border-radius:10px;background:var(--bg)}
.use-card h3{margin:6px 0 10px}.use-card p{margin:10px 0}.use-card summary{cursor:pointer;color:var(--blue);font-weight:600;padding:8px 0}
.use-card pre{padding:14px;background:var(--code-bg);border-radius:8px;font-size:12px;white-space:pre-wrap;overflow-wrap:anywhere}
.decorator-uses a{color:var(--blue)}
@media(max-width:640px){.uses-grid{grid-template-columns:minmax(0,1fr)}}