/* Cuaderno de Alexandra — hoja compartida. Paleta y tipografía tomadas de lumini.dev:
   monocromo (gray-950 / blanco / gray-400), Inter, labels uppercase con tracking, azul-400 solo en enlaces. */
:root{
  --bg:#030712; --surface:#0d1117; --surface-2:#161b22; --ink:#ffffff; --muted:#9ca3af; --line:rgba(255,255,255,.12); --line-strong:rgba(255,255,255,.28);
  --accent:#ffffff; --link:#60a5fa; --link-hover:#93c5fd;
  --soft:rgba(255,255,255,.05); --soft-2:rgba(255,255,255,.09);
  --violet:#c4b5fd; --violet-soft:rgba(139,92,246,.14);
  --warn:#f87171; --warn-soft:rgba(248,113,113,.12);
  --ok:#4ade80; --ok-soft:rgba(74,222,128,.12);
  --code-bg:#000000; --code-ink:#e5e7eb; --code-line:rgba(255,255,255,.1);
  --shadow:0 1px 2px rgba(0,0,0,.5),0 12px 32px -16px rgba(0,0,0,.8);
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"JetBrains Mono","SF Mono",Menlo,Consolas,"DejaVu Sans Mono",monospace;
  color-scheme:dark;
}
@media (prefers-color-scheme: light){
  :root:not([data-theme="dark"]){
    --bg:#ffffff; --surface:#f9fafb; --surface-2:#f3f4f6; --ink:#000000; --muted:#4b5563; --line:rgba(0,0,0,.1); --line-strong:rgba(0,0,0,.3);
    --accent:#000000; --link:#2563eb; --link-hover:#1d4ed8;
    --soft:rgba(0,0,0,.035); --soft-2:rgba(0,0,0,.06);
    --violet:#6d28d9; --violet-soft:rgba(109,40,217,.08);
    --warn:#b91c1c; --warn-soft:rgba(185,28,28,.07);
    --ok:#15803d; --ok-soft:rgba(21,128,61,.08);
    --code-bg:#0a0a0a; --code-ink:#e5e7eb; --code-line:rgba(255,255,255,.1);
    --shadow:0 1px 2px rgba(0,0,0,.05),0 12px 32px -18px rgba(0,0,0,.18);
    color-scheme:light;
  }
}
:root[data-theme="light"]{
  --bg:#ffffff; --surface:#f9fafb; --surface-2:#f3f4f6; --ink:#000000; --muted:#4b5563; --line:rgba(0,0,0,.1); --line-strong:rgba(0,0,0,.3);
  --accent:#000000; --link:#2563eb; --link-hover:#1d4ed8;
  --soft:rgba(0,0,0,.035); --soft-2:rgba(0,0,0,.06);
  --violet:#6d28d9; --violet-soft:rgba(109,40,217,.08);
  --warn:#b91c1c; --warn-soft:rgba(185,28,28,.07);
  --ok:#15803d; --ok-soft:rgba(21,128,61,.08);
  --code-bg:#0a0a0a; --code-ink:#e5e7eb; --code-line:rgba(255,255,255,.1);
  --shadow:0 1px 2px rgba(0,0,0,.05),0 12px 32px -18px rgba(0,0,0,.18);
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16.5px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--link);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s,color .2s}
a:hover{color:var(--link-hover);border-bottom-color:currentColor}
:focus-visible{outline:2px solid var(--link);outline-offset:2px;border-radius:3px}
h1,h2,h3,h4{font-family:var(--sans);line-height:1.1;text-wrap:balance;margin:0;letter-spacing:-.02em}
h1{font-size:clamp(2.4rem,5vw,4rem);font-weight:900;line-height:.98}
h2{font-size:clamp(1.7rem,2.8vw,2.4rem);font-weight:800;margin-bottom:.5rem}
h3{font-size:1.3rem;font-weight:700;letter-spacing:-.01em}
h4{font-size:1rem;font-weight:700;letter-spacing:0}
p{margin:0 0 1rem}
ul,ol{margin:0 0 1rem;padding-left:1.3rem}
li{margin:.25rem 0}
li::marker{color:var(--muted)}
code{font-family:var(--mono);font-variant-ligatures:none;font-feature-settings:"liga" 0,"calt" 0;font-size:.84em;background:var(--soft-2);padding:.12em .4em;border-radius:5px;border:1px solid var(--line)}
pre{font-variant-ligatures:none;font-feature-settings:"liga" 0,"calt" 0;background:var(--code-bg);color:var(--code-ink);padding:1rem 1.15rem;border-radius:10px;overflow-x:auto;font-size:.83rem;line-height:1.6;margin:0 0 1rem;border:1px solid var(--code-line);font-family:var(--mono)}
pre code{background:none;border:0;padding:0;font-size:inherit;color:inherit}
strong{font-weight:700}
.eyebrow{font-family:var(--sans);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:600}
.muted{color:var(--muted)}
.small{font-size:.9rem}

/* layout */
.shell{display:grid;grid-template-columns:1fr;max-width:1200px;margin:0 auto;padding:0 1.25rem 5rem}
@media (min-width:1024px){.shell{grid-template-columns:240px minmax(0,1fr);gap:3.5rem;padding:0 2rem 6rem}}
nav.toc{display:none}
@media (min-width:1024px){
  nav.toc{display:block;position:sticky;top:0;align-self:start;height:100vh;overflow-y:auto;padding:2.5rem 0 2rem;font-size:.85rem}
  nav.toc .brand{font-weight:800;letter-spacing:-.02em;font-size:1.05rem;margin-bottom:1.25rem;display:block;color:var(--ink);border:0}
  nav.toc .brand:hover{color:var(--muted)}
  nav.toc ol{list-style:none;padding:0;margin:0 0 1.2rem}
  nav.toc li{margin:0}
  nav.toc a{display:block;padding:.28rem 0 .28rem .75rem;border:0;border-left:1px solid var(--line);color:var(--muted);line-height:1.35}
  nav.toc a:hover{color:var(--ink);border-left-color:var(--line-strong)}
  nav.toc a.active{color:var(--ink);border-left-color:var(--ink);font-weight:600}
  nav.toc .group{font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:1rem 0 .3rem;font-weight:600}
}
.progress{border:1px solid var(--line);border-radius:12px;padding:.75rem .9rem;background:var(--surface);margin-top:.5rem}
.progress b{font-variant-numeric:tabular-nums;font-size:1.35rem;font-weight:800;color:var(--ink);display:block;line-height:1;letter-spacing:-.02em}
.progress .bar{height:4px;background:var(--soft-2);border-radius:2px;overflow:hidden;margin:.55rem 0 .35rem}
.progress .bar i{display:block;height:100%;width:0;background:var(--ink);transition:width .3s}
main{min-width:0;max-width:820px}
section{padding-top:3.5rem;scroll-margin-top:1rem}
section+section{border-top:1px solid var(--line);margin-top:3rem}
.prose{max-width:66ch}
.lede{font-size:1.2rem;line-height:1.55;color:var(--ink);max-width:60ch}

/* hero */
header.hero{padding:3.5rem 0 2.5rem;position:relative}
header.hero::before{content:"";position:absolute;inset:0 -1.25rem;background-image:radial-gradient(var(--line-strong) 1px,transparent 1px);background-size:22px 22px;opacity:.5;mask-image:linear-gradient(to bottom,rgba(0,0,0,.9),transparent 85%);-webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,.9),transparent 85%);pointer-events:none;z-index:0}
header.hero>*{position:relative;z-index:1}
.hero .meta{display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;margin-top:1.4rem;font-family:var(--mono);font-size:.74rem;color:var(--muted)}
.hero .meta span b{color:var(--ink);font-weight:600}
.hero .dedic{font-size:1.15rem;font-style:italic;color:var(--muted);margin:.9rem 0 .35rem;letter-spacing:.01em}
.hero .sub{font-size:1.2rem;color:var(--muted);margin:.9rem 0 1.4rem;max-width:56ch;line-height:1.5}

/* cards & callouts */
.grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin:1.25rem 0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:1.15rem 1.25rem;box-shadow:var(--shadow);transition:border-color .3s,transform .3s}
.card:hover{border-color:var(--line-strong)}
.card h4{margin-bottom:.4rem}
.card p:last-child{margin-bottom:0}
.callout{border:1px solid var(--line);border-left:3px solid var(--ink);background:var(--soft);padding:.95rem 1.15rem;border-radius:0 12px 12px 0;margin:1.25rem 0}
.callout.violet{border-left-color:var(--violet);background:var(--violet-soft)}
.callout.warn{border-left-color:var(--warn);background:var(--warn-soft)}
.callout.ok{border-left-color:var(--ok);background:var(--ok-soft)}
.callout p:last-child{margin-bottom:0}
.callout .label{font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;font-weight:700;display:block;margin-bottom:.35rem;color:var(--ink)}
.callout.violet .label{color:var(--violet)}
.callout.warn .label{color:var(--warn)}
.callout.ok .label{color:var(--ok)}

table{border-collapse:collapse;width:100%;font-size:.93rem;margin:1rem 0 1.5rem}
.tablewrap{overflow-x:auto;margin:1rem 0 1.5rem}
.tablewrap table{margin:0}
th,td{text-align:left;padding:.6rem .7rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:700}
td code{white-space:nowrap}
tbody tr:hover{background:var(--soft)}
.num{font-variant-numeric:tabular-nums;font-family:var(--mono);font-size:.85rem}

/* habits */
.habit{display:grid;grid-template-columns:1fr;gap:.6rem 1.5rem;padding:1.4rem 0;border-top:1px solid var(--line)}
@media (min-width:720px){.habit{grid-template-columns:200px 1fr}}
.habit:last-of-type{border-bottom:0}
.habit .lab{font-size:1.5rem;font-weight:800;line-height:1.1;letter-spacing:-.02em}
.habit .lab small{display:block;font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-top:.4rem;font-weight:600}
.habit ul{margin-bottom:.4rem}

/* project ficha */
.ficha{background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);margin:1.75rem 0;overflow:hidden}
.ficha header{display:flex;flex-wrap:wrap;gap:.6rem 1rem;align-items:baseline;padding:1.15rem 1.4rem 1rem;border-bottom:1px solid var(--line);background:var(--surface-2)}
.ficha .n{font-size:2rem;font-weight:900;line-height:1;color:var(--ink);font-variant-numeric:tabular-nums;min-width:2.2ch;letter-spacing:-.03em}
.ficha h3{flex:1 1 auto;font-size:1.35rem;font-weight:800}
.ficha h3 small{display:block;font-weight:400;font-size:.9rem;color:var(--muted);margin-top:.2rem;letter-spacing:0}
.chips{display:flex;flex-wrap:wrap;gap:.4rem;width:100%}
.chip{font-family:var(--mono);font-size:.68rem;letter-spacing:.04em;padding:.24rem .6rem;border-radius:999px;border:1px solid var(--line);color:var(--muted);background:var(--bg);white-space:nowrap}
.chip.concept{border-color:var(--line-strong);color:var(--ink);background:var(--soft-2)}
.ficha .body{display:grid;grid-template-columns:1fr;gap:1.4rem 2rem;padding:1.3rem 1.4rem 1.5rem}
@media (min-width:860px){.ficha .body{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr)}}
.ficha .body h4{font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 .45rem;font-weight:700}
.ficha .body>div>*+h4{margin-top:1.15rem}
.ficha .body p,.ficha .body ul{margin-bottom:.4rem;font-size:.95rem}
.ficha .body ul{padding-left:1.15rem}
.ficha .trap{border-left:3px solid var(--warn);padding:.35rem 0 .35rem .8rem;color:var(--ink);font-size:.93rem}
.ficha .trap b{color:var(--warn)}
.ficha .go{margin-top:1rem}
.btn{display:inline-flex;align-items:center;gap:.5rem;font-size:.78rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;padding:.6rem 1rem;border-radius:8px;border:1px solid var(--line-strong);color:var(--ink);background:transparent;transition:background .25s,color .25s,border-color .25s}
.btn:hover{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.btn.primary{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.btn.primary:hover{background:transparent;color:var(--ink)}
.done{list-style:none;padding:0;margin:0}
.done li{display:flex;gap:.6rem;align-items:flex-start;padding:.35rem 0;border-bottom:1px dashed var(--line);font-size:.93rem;margin:0}
.done li:last-child{border-bottom:0}
.done input{margin:.35rem 0 0;accent-color:var(--ink);flex:0 0 auto;width:15px;height:15px}
.done label{cursor:pointer}
.done input:checked+label{color:var(--muted);text-decoration:line-through;text-decoration-color:var(--line-strong)}
.ficha aside.tools{margin-top:1rem;font-size:.85rem;color:var(--muted)}
.ficha aside.tools code{font-size:.8em}

/* antipatterns */
.anti{display:grid;grid-template-columns:1fr;gap:.75rem;margin:1rem 0 1.5rem}
@media (min-width:720px){.anti{grid-template-columns:1fr 1fr}}
.anti .item{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:.9rem 1rem;font-size:.92rem}
.anti .item b{display:block;color:var(--warn);font-weight:700;margin-bottom:.2rem}
.anti .item span{display:block;color:var(--ink)}
.anti .item em{display:block;color:var(--muted);font-style:normal;margin-top:.4rem}
.anti .item em::before{content:"→ ";color:var(--ink)}

/* prompts */
.pair{display:grid;grid-template-columns:1fr;gap:.75rem;margin:1rem 0 1.5rem}
@media (min-width:720px){.pair{grid-template-columns:1fr 1fr}}
.pair .no,.pair .yes{border-radius:12px;padding:.9rem 1rem;font-size:.92rem;border:1px solid var(--line);background:var(--surface)}
.pair .no{border-top:3px solid var(--warn)}
.pair .yes{border-top:3px solid var(--ok)}
.pair .tag{font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;font-weight:700;display:block;margin-bottom:.4rem}
.pair .no .tag{color:var(--warn)}
.pair .yes .tag{color:var(--ok)}
.pair q{font-style:italic;font-size:.98rem;display:block;margin-bottom:.4rem;color:var(--ink)}
.pair q::before,.pair q::after{content:none}

.rules{counter-reset:r;list-style:none;padding:0;margin:1.25rem 0}
.rules li{counter-increment:r;display:grid;grid-template-columns:2.6rem 1fr;column-gap:.6rem;row-gap:.15rem;padding:.85rem 0;border-top:1px solid var(--line);margin:0}
.rules li>b,.rules li>p{grid-column:2}
.rules li::before{grid-column:1;grid-row:1 / span 2;content:counter(r,decimal-leading-zero);font-family:var(--mono);font-size:1.15rem;color:var(--muted);line-height:1.3;font-variant-numeric:tabular-nums}
.rules li:last-child{border-bottom:1px solid var(--line)}
.rules li b{display:block;margin-bottom:.15rem}
.rules li p{margin:0;font-size:.95rem}

.week{display:grid;grid-template-columns:1fr;gap:.6rem;margin:1rem 0 1.5rem}
@media (min-width:640px){.week{grid-template-columns:repeat(4,1fr)}}
.week .step{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:.85rem .95rem;font-size:.9rem}
.week .step b{display:block;font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:.3rem;font-weight:700}

.res{list-style:none;padding:0;margin:1rem 0}
.res li{padding:.65rem 0;border-top:1px solid var(--line);margin:0;display:grid;grid-template-columns:1fr;gap:.15rem}
.res li:last-child{border-bottom:1px solid var(--line)}
.res li span{font-size:.9rem;color:var(--muted)}
footer{margin-top:4rem;padding-top:1.5rem;border-top:1px solid var(--line);font-size:.86rem;color:var(--muted)}

/* ===== Páginas de tutorial (proyectos/NN/) ===== */
.crumbs{font-size:.78rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;font-weight:600;margin-top:2.5rem;display:flex;flex-wrap:wrap;gap:.4rem .6rem;align-items:center}
.crumbs a{color:var(--muted);border:0}
.crumbs a:hover{color:var(--ink)}
.crumbs .sep{opacity:.5}
header.tut{padding:1.2rem 0 2rem;border-bottom:1px solid var(--line)}
header.tut .pn{font-family:var(--mono);font-size:.78rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;font-weight:600;margin-bottom:.6rem;display:block}
header.tut h1{font-size:clamp(2rem,4.2vw,3.2rem)}
header.tut .sub{font-size:1.15rem;color:var(--muted);margin:.8rem 0 1.2rem;max-width:60ch;line-height:1.5}
header.tut .chips{margin-top:.4rem}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:.6rem;margin:1.4rem 0 0}
.facts div{border:1px solid var(--line);border-radius:12px;padding:.7rem .9rem;background:var(--surface)}
.facts b{display:block;font-size:.64rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:.2rem}
.facts span{font-size:.92rem}
.tut-section{padding-top:2.75rem;scroll-margin-top:1rem}
.tut-section+.tut-section{margin-top:2.5rem;border-top:1px solid var(--line)}
.tut-section h2{font-size:clamp(1.45rem,2.4vw,1.9rem)}
.objetivos{list-style:none;padding:0;margin:1rem 0}
.objetivos li{padding:.45rem 0 .45rem 1.7rem;position:relative;border-bottom:1px solid var(--line);margin:0}
.objetivos li:last-child{border-bottom:0}
.objetivos li::before{content:"";position:absolute;left:.15rem;top:.95rem;width:.7rem;height:.7rem;border:1.5px solid var(--ink);border-radius:2px}
.temas{list-style:none;padding:0;margin:1rem 0}
.temas li{display:grid;grid-template-columns:1fr;gap:.1rem .8rem;padding:.55rem 0;border-top:1px solid var(--line);margin:0;font-size:.95rem}
@media (min-width:640px){.temas li{grid-template-columns:minmax(0,1.1fr) minmax(0,1.6fr)}}
.temas li:last-child{border-bottom:1px solid var(--line)}
.temas li span{color:var(--muted);font-size:.9rem}
.temas li a{font-weight:600}
.temas li b.t{font-weight:600}
.temas li b.t a{font-weight:600}
.step{padding:1.6rem 0 .4rem;border-top:1px dashed var(--line);scroll-margin-top:1rem}
.step:first-of-type{border-top:0}
.step h3{display:flex;gap:.8rem;align-items:baseline;margin-bottom:.9rem}
.step h3 .stepn{font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--bg);background:var(--ink);padding:.22rem .55rem;border-radius:6px;font-weight:700;white-space:nowrap;flex:0 0 auto}
.step p,.step ul,.step ol{max-width:70ch}
.file{margin:1rem 0 1.25rem}
.file .fname{font-family:var(--mono);font-size:.74rem;color:var(--muted);letter-spacing:.04em;padding:.35rem .8rem;border:1px solid var(--code-line);border-bottom:0;border-radius:10px 10px 0 0;background:var(--code-bg);display:inline-block;margin-bottom:-1px;position:relative;z-index:1}
.file pre{border-radius:0 10px 10px 10px;margin-top:0}
.file .fname::before{content:"";display:inline-block;width:.5rem;height:.5rem;border-radius:50%;background:var(--muted);margin-right:.5rem;opacity:.7}
.cmd{position:relative}
.cmd pre{padding-right:4.2rem}
.cmd .copy{position:absolute;top:.55rem;right:.55rem;font-family:var(--sans);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;font-weight:700;color:var(--code-ink);background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:6px;padding:.3rem .55rem;cursor:pointer;transition:background .2s}
.cmd .copy:hover{background:rgba(255,255,255,.18)}
.cmd .copy.ok{background:rgba(74,222,128,.25);border-color:rgba(74,222,128,.5)}
.expect{margin:.4rem 0 1.25rem}
.expect .lbl{font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;font-weight:700;color:var(--muted);display:block;margin-bottom:.35rem}
.expect pre{color:#a3e635;font-size:.8rem;border-style:dashed}
.expect.bad pre{color:#fca5a5}
.why{border-left:2px solid var(--line-strong);padding:.15rem 0 .15rem .9rem;color:var(--muted);font-size:.93rem;margin:.75rem 0 1.1rem;max-width:66ch}
.why b{color:var(--ink);font-weight:600}
details.trouble{border:1px solid var(--line);border-radius:12px;padding:0;margin:.6rem 0;background:var(--surface)}
details.trouble summary{cursor:pointer;padding:.8rem 1rem;font-weight:600;font-size:.95rem;list-style:none;display:flex;gap:.6rem;align-items:baseline}
details.trouble summary::-webkit-details-marker{display:none}
details.trouble summary::before{content:"+";font-family:var(--mono);color:var(--muted);flex:0 0 auto}
details.trouble[open] summary::before{content:"–"}
details.trouble summary code{font-size:.8em}
details.trouble .in{padding:0 1rem 1rem;font-size:.93rem;border-top:1px solid var(--line)}
details.trouble .in p:first-child{margin-top:.8rem}
.tree pre{font-size:.8rem;line-height:1.5}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--line)}
.pager a{display:block;border:1px solid var(--line);border-radius:14px;padding:1rem 1.15rem;color:var(--ink);background:var(--surface);transition:border-color .25s}
.pager a:hover{border-color:var(--line-strong)}
.pager a small{display:block;font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:.3rem}
.pager a.next{text-align:right}
.pager a b{font-weight:700}
@media (max-width:560px){.pager{grid-template-columns:1fr}.pager a.next{text-align:left}}
.claude-block{border:1px solid var(--line);border-radius:14px;background:var(--violet-soft);padding:1.1rem 1.25rem;margin:1.25rem 0}
.claude-block h4{color:var(--violet);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:.6rem}
.claude-block q{display:block;font-style:italic;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:.7rem .9rem;margin:.5rem 0;font-size:.95rem}
.claude-block q::before,.claude-block q::after{content:none}
.claude-block p{font-size:.95rem}
.claude-block ul{font-size:.95rem}
.ficha .go{margin:0;padding:1rem 1.4rem 1.25rem;border-top:1px solid var(--line);display:flex;gap:1rem;align-items:center;flex-wrap:wrap}
.ficha .go span{font-size:.88rem;color:var(--muted)}

/* ===== Móvil: barra superior + menú desplegable ===== */
.mobilebar{display:none}
nav.toc .closenav{display:none}
@media (max-width:1023px){
  body{font-size:16px}
  .mobilebar{display:flex;position:sticky;top:0;z-index:40;align-items:center;justify-content:space-between;gap:1rem;padding:.7rem 1.25rem;margin:0 -1.25rem;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
  .mobilebar .brand{font-weight:800;letter-spacing:-.02em;color:var(--ink);border:0;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .mobilebar button{font:inherit;font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--ink);background:transparent;border:1px solid var(--line-strong);border-radius:8px;padding:.45rem .8rem;cursor:pointer;flex:0 0 auto}
  body.nav-open{overflow:hidden}
  body.nav-open nav.toc{display:block;position:fixed;inset:0;z-index:60;overflow-y:auto;background:var(--bg);padding:1.25rem 1.5rem 3rem;font-size:1rem;height:auto}
  body.nav-open nav.toc .brand{font-weight:800;font-size:1.1rem;display:block;color:var(--ink);border:0;margin:0 0 1rem;padding-right:5rem}
  body.nav-open nav.toc ol{list-style:none;padding:0;margin:0 0 1.2rem}
  body.nav-open nav.toc li{margin:0}
  body.nav-open nav.toc a{display:block;padding:.55rem 0 .55rem .8rem;border:0;border-left:1px solid var(--line);color:var(--muted);line-height:1.35}
  body.nav-open nav.toc a.active{color:var(--ink);border-left-color:var(--ink);font-weight:600}
  body.nav-open nav.toc .group{font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:1.1rem 0 .3rem;font-weight:600}
  body.nav-open nav.toc .closenav{display:block;position:fixed;top:.9rem;right:1.25rem;z-index:61;font:inherit;font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--bg);background:var(--ink);border:0;border-radius:8px;padding:.5rem .85rem;cursor:pointer}
  header.hero{padding-top:2rem}
  h1{font-size:clamp(2rem,9vw,2.6rem)}
  header.tut h1{font-size:clamp(1.7rem,7.5vw,2.4rem)}
  .crumbs{margin-top:1.25rem}
  .step h3{flex-wrap:wrap}
  pre{font-size:.78rem}
  .ficha header{padding:1rem 1.1rem .9rem}
  .ficha .body{padding:1.1rem 1.1rem 1.25rem}
  .ficha .go{padding:.9rem 1.1rem 1.1rem}
}