/* AprenderJavaScript: una paleta, una escala y componentes compartidos. */
:root {
  color-scheme:dark;
  --bg:#101519;
  --surface:#171e23;
  --surface-hover:#202a30;
  --ink:#f0f3f5;
  --text:#d0d9df;
  --muted:#b4bfc7;
  --line:#344149;
  --control-border:#647780;
  --brand:#86ded1;
  --accent:#9ae6db;
  --accent-soft:#1b3434;
  --green:#a7e6c5;
  --red:#ffb5ac;
  --navy:#0c1317;
  --navy2:var(--surface);
  --learning-success:var(--green);
  --learning-error:var(--red);
  --learning-stroke:var(--line);
  --font-text:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-display:var(--font-text);
  --font-code:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;
  --space-xs:.5rem;
  --space-sm:.75rem;
  --space-md:1.5rem;
  --space-lg:2rem;
  --space-xl:3rem;
  --space-section:clamp(2.5rem,4.5vw,3.5rem);
  --radius:12px;
  --radius-control:8px;
  --shadow:0 8px 24px rgb(0 0 0 / .12);
}

/* Base y lectura */
*,*::before,*::after { box-sizing:border-box; }
html { background:var(--bg); scroll-behavior:smooth; scroll-padding-top:88px; }
body { margin:0; background:var(--bg); color:var(--ink); font:400 1.0625rem/1.7 var(--font-text); -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility; }
h1,h2,h3,h4 { margin:0; font-family:var(--font-display); font-weight:650; letter-spacing:-.025em; text-wrap:balance; }
h1 { font-size:clamp(2rem,3.2vw,2.625rem); line-height:1.2; }
h2 { font-size:clamp(1.5rem,2.2vw,1.75rem); line-height:1.3; }
h3 { font-size:1.25rem; line-height:1.4; }
h4 { font-size:1rem; line-height:1.4; }
p { margin:0 0 1rem; }
:where(p,li,blockquote) { overflow-wrap:break-word; }
:where(strong,b) { font-weight:650; }
a { color:inherit; text-decoration:none; text-underline-offset:.2em; }
a:hover { color:var(--accent); }
:where(.article,.prose,.ref-article) a, a.link { color:var(--accent); text-decoration:underline; }
:where(.article,.prose,.ref-article) a:hover, a.link:hover { text-decoration-thickness:2px; }
:where(.article,.prose,.ref-article) a.btn { text-decoration:none; }
button,input,textarea,select { font:inherit; }
button { cursor:pointer; }
:where(button,a) { touch-action:manipulation; }
:where(a,button,input,textarea,select,summary) { -webkit-tap-highlight-color:transparent; scroll-margin-block:88px 24px; }
:where(a,button,input,textarea,select,summary):focus-visible { outline:3px solid var(--brand); outline-offset:3px; }
button:disabled { opacity:.6; cursor:not-allowed; }
img { display:block; max-width:100%; height:auto; }
hr { border:0; border-top:1px solid var(--line); margin:2rem 0; }
::selection { background:var(--brand); color:#102724; }
code,pre,textarea.code-input { font-family:var(--font-code); }
code { padding:.12em .3em; background:#223039; color:#d9eeec; border-radius:4px; font-size:.94em; overflow-wrap:anywhere; }
pre { margin:1.25rem 0; font-size:1rem; line-height:1.65; overflow-x:auto; tab-size:2; }
pre code { padding:0; background:transparent; color:inherit; font:inherit; overflow-wrap:normal; }
[hidden],.hide { display:none!important; }
.print-only { display:none; }
.sr-only { position:absolute; width:1px; height:1px; margin:-1px; padding:0; border:0; overflow:hidden; clip-path:inset(50%); white-space:nowrap; }
.skip { position:fixed; z-index:1000; top:8px; left:16px; transform:translateY(-160%); padding:12px 18px; border-radius:8px; background:var(--brand); color:#102724; font-weight:650; }
.skip:focus { transform:none; }
.container { width:min(1160px,calc(100% - 64px)); margin-inline:auto; }
.narrow { width:min(760px,calc(100% - 64px)); margin-inline:auto; }
.lead { max-width:60ch; color:var(--muted); font-size:1.125rem; line-height:1.65; }
.muted { color:var(--muted); }
.small,small { font-size:.875rem; line-height:1.6; }
.eyebrow,.caps { color:var(--muted); font-size:.875rem; line-height:1.5; letter-spacing:.045em; font-weight:600; text-transform:uppercase; }
.eyebrow { display:inline-flex; align-items:center; gap:8px; }
.eyebrow::before { content:""; width:12px; height:3px; flex:none; background:var(--brand); border-radius:2px; }

/* Controles */
.btn { display:inline-flex; align-items:center; justify-content:center; gap:8px; min-height:46px; padding:10px 18px; border:1px solid transparent; border-radius:var(--radius-control); font-size:1rem; font-weight:600; line-height:1.4; text-align:center; cursor:pointer; transition:background .15s,border-color .15s; }
.btn-primary,.btn-dark,.mini-circle { background:var(--brand); border-color:var(--brand); color:#102724; }
.btn-primary:hover,.btn-dark:hover,.mini-circle:hover { background:#a8ecdf; border-color:#a8ecdf; color:#102724; }
.btn-outline,.btn-quiet,.btn-blue { background:transparent; border-color:var(--control-border); color:var(--ink); }
.btn-outline:hover,.btn-quiet:hover,.btn-blue:hover { background:var(--surface-hover); border-color:var(--brand); color:var(--ink); }
.btn-sm { min-height:44px; padding:8px 14px; font-size:.875rem; }
.actions { display:flex; align-items:center; flex-wrap:wrap; gap:12px; }
.actions .btn:has(+input.sr-only:focus-visible) { outline:3px solid var(--brand); outline-offset:3px; }
input:not([type=checkbox]):not([type=radio]):not([type=file]),select,textarea:not(.code-input) { min-height:48px; padding:10px 14px; border:1px solid var(--control-border); border-radius:var(--radius-control); background:var(--navy); color:var(--ink); font-size:1rem; }
input::placeholder,textarea::placeholder { color:var(--muted); opacity:1; }
.search-input,select.input { width:100%; }
.pill { display:inline-flex; align-items:center; max-width:100%; padding:3px 10px; border:1px solid var(--line); border-radius:6px; background:var(--surface-hover); color:var(--text); font-size:.875rem; font-weight:550; line-height:1.5; }
.pill.optional,.pill.green { background:var(--accent-soft); color:#c6eee4; border-color:#41635d; }
.pill.blue { background:#202f3b; color:#d5e6f5; border-color:#4b6375; }
.filter-controls,.ref-filters { display:flex; flex-wrap:wrap; gap:8px; margin:24px 0 32px; }
.filter-controls button,.ref-filters button { min-height:44px; padding:9px 14px; border:1px solid var(--control-border); border-radius:var(--radius-control); background:var(--surface); color:var(--text); font-size:.9375rem; font-weight:550; line-height:1.4; }
.filter-controls button:hover,.ref-filters button:hover { background:var(--surface-hover); border-color:var(--brand); }
.filter-controls button.active,.ref-filters button.selected { background:#243e39; border-color:var(--brand); color:var(--ink); }

/* Navegación */
.site-header { position:sticky; top:0; z-index:200; border-bottom:1px solid var(--line); background:var(--bg); }
.header-inner { display:flex; align-items:center; justify-content:space-between; min-height:68px; gap:24px; }
.brand { display:inline-flex; align-items:center; gap:10px; flex-shrink:0; color:var(--ink); font-size:1rem; font-weight:700; letter-spacing:-.025em; white-space:nowrap; }
.brand .js { color:var(--brand); }
.brand-icon { display:grid; place-items:center; width:34px; height:34px; flex:none; border-radius:8px; background:var(--brand); color:#102724; font:700 15px var(--font-code); letter-spacing:-.1em; }
.site-nav { display:flex; align-items:center; gap:4px; }
.site-nav a { display:inline-flex; align-items:center; min-height:44px; padding:9px 12px; border-radius:8px; color:var(--muted); font-size:.9375rem; font-weight:550; }
.site-nav a:hover,.site-nav a[aria-current="page"] { background:var(--surface); color:var(--ink); }
.header-actions { display:flex; align-items:center; gap:8px; }
.icon-btn { display:inline-flex; align-items:center; justify-content:center; min-width:44px; min-height:44px; padding:8px; border:1px solid var(--control-border); border-radius:8px; background:transparent; color:var(--ink); font-size:.9375rem; font-weight:550; }
.icon-btn:hover { background:var(--surface-hover); border-color:var(--brand); color:var(--ink); }
.search-glyph { font-size:1.45rem; line-height:1; }
.menu-btn,.mobile-nav { display:none; }
.crumb { display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin-bottom:20px; color:var(--muted); font-size:.875rem; line-height:1.6; }
.crumb a { text-decoration:underline; }
.crumb a:hover { color:var(--accent); }

/* Cabeceras, columnas y tarjetas */
.page-hero,.ref-hero { padding:36px 0; border-bottom:1px solid var(--line); }
.page-hero h1,.ref-hero h1 { max-width:30ch; margin:12px 0 16px; }
.page-hero .lead,.ref-hero .lead { margin:0; }
.page-hero .actions { margin-top:24px; }
.page-pad,.ref-main { padding:32px 0 64px; }
.section { padding:var(--space-section) 0; }
.section-dark { background:#141b20; }
.section-head { display:flex; align-items:flex-end; justify-content:space-between; gap:24px; margin-bottom:28px; }
.section-head h2 { max-width:30ch; }
.section-head .eyebrow+h2 { margin-top:12px; }
.section-head p { max-width:58ch; margin:12px 0 0; color:var(--muted); }
.grid-3,.grid-4,.glass-grid,.modules-list,.ref-grid { display:grid; gap:20px; }
.grid-3 { grid-template-columns:repeat(3,minmax(0,1fr)); }
.grid-4 { grid-template-columns:repeat(4,minmax(0,1fr)); }
.glass-grid,.modules-list,.ref-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
:where(.feature,.link-card,.project-card,.exercise-card,.ref-card,.next-card) { min-width:0; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.feature,.link-card,.exercise-card { padding:24px; }
.feature h3 { margin:0 0 12px; }
.feature p,.link-card p,.exercise-card p,.project-body p { margin:0; color:var(--muted); font-size:1rem; line-height:1.65; }
.feature-number,.module-index,.module-num { display:grid; place-items:center; flex:none; width:44px; height:44px; border-radius:8px; background:#233b39; color:#b8e8df; font-size:1rem; font-weight:650; font-variant-numeric:tabular-nums; }
.feature-number { margin-bottom:24px; }
.link-card,.exercise-card { display:flex; flex-direction:column; }
.link-card { transition:background .15s,border-color .15s,box-shadow .15s; }
.link-card small { color:var(--muted); font-weight:550; }
.link-card h3 { margin:14px 0 12px; }
.link-card .arrow { margin-top:auto; padding-top:24px; color:var(--accent); font-size:.9375rem; font-weight:600; }
.link-card:hover,.link-card:focus-visible { background:var(--surface-hover); border-color:#5f8781; box-shadow:var(--shadow); color:var(--ink); }
.numbers-row { display:flex; flex-wrap:wrap; gap:24px 40px; margin-top:32px; padding-top:24px; border-top:1px solid var(--line); }
.stat strong { display:block; font-size:2rem; line-height:1.2; font-weight:600; letter-spacing:-.025em; }
.stat span { color:var(--muted); font-size:.9375rem; }
.modules-list { gap:12px; }
.module-link { display:flex; align-items:center; gap:16px; min-width:0; padding:18px; border:1px solid var(--line); border-radius:10px; background:var(--surface); transition:background .15s,border-color .15s; }
.module-link strong { display:block; font-size:1rem; line-height:1.4; }
.module-link small { display:block; margin-top:4px; color:var(--muted); }
.module-link .end { margin-left:auto; color:var(--accent); }
.module-link:hover { background:var(--surface-hover); border-color:#5f8781; color:var(--ink); }
.promo { display:flex; align-items:center; justify-content:space-between; gap:32px; padding:32px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.promo h2 { max-width:28ch; }
.promo .caps+h2 { margin-top:12px; }
.promo p { max-width:58ch; margin:12px 0 0; color:var(--muted); }

/* Portada */
.hero { padding:48px 0 48px; }
.hero-grid { display:grid; grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr); align-items:center; gap:40px; }
.hero h1 { max-width:21ch; margin:16px 0 20px; font-size:clamp(2.125rem,3.8vw,3rem); line-height:1.16; }
.accent-highlight { color:var(--brand); }
.hero .lead { max-width:50ch; }
.hero .actions { margin-top:24px; }
.hero-proof { display:flex; flex-wrap:wrap; gap:8px 16px; margin-top:20px; color:var(--muted); font-size:.875rem; }
.hero-proof span::before { content:"✓"; margin-right:6px; color:var(--green); }
.demo-shell { overflow:hidden; border:1px solid var(--line); border-radius:var(--radius); background:var(--navy); }
.window-top { display:flex; align-items:center; gap:6px; padding:12px 16px; border-bottom:1px solid var(--line); background:var(--surface); }
.dot { width:8px; height:8px; flex:none; border-radius:50%; background:#758790; }
.dot:nth-child(2) { background:#95aaa9; }
.dot:nth-child(3) { background:var(--brand); }
.window-title { min-width:0; margin-inline:auto; color:var(--muted); font:400 .875rem/1.5 var(--font-code); overflow-wrap:anywhere; }
.hero-code { margin:0; padding:24px; color:#e0ebef; font:400 1rem/1.7 var(--font-code); white-space:pre-wrap; overflow-wrap:anywhere; }
.syntax-key { color:#e0baf2; }
.syntax-str { color:#f0d48e; }
.syntax-call { color:#a6cdec; }
.hero-demo-bottom { display:flex; align-items:center; justify-content:space-between; gap:16px; padding:20px 24px; border-top:1px solid var(--line); background:var(--surface); }
.demo-number { font-size:2rem; line-height:1.2; letter-spacing:-.025em; }
.demo-number small { display:block; margin-bottom:6px; color:var(--muted); font-size:.875rem; font-weight:500; letter-spacing:.035em; text-transform:uppercase; }
.counter-unit { font-size:1rem; font-weight:500; color:var(--muted); }
.mini-circle { width:48px; min-height:48px; border:1px solid var(--brand); border-radius:8px; font-size:1.5rem; }
.hero-demo-caption { margin:12px 0 0; text-align:center; }

/* Artículos y páginas informativas */
.article,.prose,.ref-article { min-width:0; max-width:42rem; color:var(--text); font-size:1.0625rem; line-height:1.7; }
:where(.article,.prose,.ref-article) :where(p,li,blockquote) { max-width:70ch; }
:where(.article,.prose,.ref-article) h2 { margin:32px 0 14px; color:var(--ink); font-size:1.5rem; line-height:1.3; }
:where(.article,.prose,.ref-article) h3 { margin:24px 0 12px; color:var(--ink); font-size:1.25rem; }
:is(.article,.prose,.ref-article)>h2:first-child { margin-top:0; }
:where(.article,.prose,.ref-article) :where(ul,ol) { padding-left:24px; margin-block:16px 24px; }
:where(.article,.prose,.ref-article) li { margin-bottom:8px; }
.prose { max-width:none; padding:32px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.prose> :last-child { margin-bottom:0; }
.prose pre { padding:20px; border:1px solid var(--line); border-radius:8px; background:var(--navy); color:var(--text); }
.note,.ref-note,.lesson-mistake { padding:16px 20px; margin:24px 0; border:0; border-left:3px solid #829b9e; border-radius:0 8px 8px 0; background:var(--surface); color:var(--text); }
.note strong,.lesson-mistake strong { color:var(--ink); }
.note p,.ref-note p,.lesson-mistake p { margin:6px 0 0; }
.note.soft { border-left-color:var(--brand); }
.note.warn { border-left-color:var(--red); }
.article-meta { color:var(--muted); font-size:.875rem; }
.notice { margin-top:20px; }
.disclosure { margin:12px 0; border:1px solid var(--line); border-radius:10px; background:var(--surface); }
.disclosure>summary { min-height:48px; padding:14px 18px; border-radius:9px; cursor:pointer; font-size:1rem; font-weight:550; line-height:1.5; list-style-position:inside; }
.disclosure>summary:hover { background:var(--surface-hover); }
.disclosure[open]>summary { border-radius:9px 9px 0 0; border-bottom:1px solid var(--line); }
.disclosure>div { padding:18px 20px; }
.disclosure>div> :last-child { margin-bottom:0; }
.disclosure pre { padding:18px; border-radius:8px; background:var(--navy); white-space:pre-wrap; }
.disclosure .btn { margin-top:12px; }
.shortcut { padding:2px 5px; border:1px solid var(--control-border); border-radius:4px; font-size:.875rem; }
.page-actions { margin-top:24px; }
.section-followup { margin-top:32px; }
.success-text { color:var(--green); }
.accent-text { color:var(--accent); }

/* Curso y lecciones */
.course-toolbar { display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:20px; padding:20px 24px; margin-bottom:24px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.course-toolbar p { margin:0; }
.course-progress { flex:1; max-width:370px; min-width:180px; }
.course-intro { margin-bottom:24px; }
.meter { height:8px; overflow:hidden; margin:12px 0; border-radius:8px; background:var(--line); }
.meter>span { display:block; width:0; height:100%; background:var(--brand); transition:width .2s; }
.course-module { overflow:hidden; margin-bottom:16px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.course-module>summary { display:flex; align-items:center; gap:16px; min-height:80px; padding:18px 20px; cursor:pointer; list-style:none; }
.course-module>summary::-webkit-details-marker { display:none; }
.course-module>summary:hover { background:var(--surface-hover); }
.course-module>summary:focus-visible { outline-offset:-3px; }
.course-ttl { flex:1; min-width:0; }
.course-ttl strong { display:block; font-size:1.0625rem; line-height:1.4; }
.course-ttl small { display:block; margin-top:4px; color:var(--muted); }
.course-module .chevron { color:var(--muted); font-size:1.25rem; }
.course-module[open] .chevron { transform:rotate(90deg); }
.course-lessons { border-top:1px solid var(--line); }
.course-lessons a { display:flex; align-items:center; gap:14px; min-height:56px; padding:14px 20px; border-bottom:1px solid var(--line); font-size:1rem; }
.course-lessons a:last-child { border-bottom:0; }
.course-lessons a:hover { background:var(--surface-hover); color:var(--ink); }
.course-lessons a strong { flex:1; min-width:0; font-weight:500; }
.lesson-num { min-width:26px; color:var(--muted); font-size:.875rem; text-align:right; font-variant-numeric:tabular-nums; }
.done,.side-done { color:var(--green); }
.lesson-layout { display:grid; grid-template-columns:250px minmax(0,1fr); align-items:start; gap:40px; }
.lesson-main { min-width:0; }
.lesson-main h1 { max-width:30ch; margin:12px 0; font-size:clamp(1.875rem,2.7vw,2.25rem); }
.lesson-kicker { margin-top:4px; }
.lesson-goal { max-width:65ch; color:var(--muted); margin-bottom:16px; }
.lesson-submeta { display:flex; flex-wrap:wrap; gap:8px; margin-bottom:16px; }
.lesson-prerequisites { max-width:70ch; margin:12px 0 24px; color:var(--muted); font-size:.875rem; line-height:1.6; }
.lesson-prerequisites strong { color:var(--text); }
.lesson-prerequisites a { color:var(--accent); text-decoration:underline; }
.lesson-new-copy,.lesson-new-finish { max-width:42rem; }
.lesson-new-copy h2:first-child { margin-top:24px; }
.lesson-concept { color:var(--ink); font-size:1.125rem; line-height:1.7; font-weight:500; }
.lesson-before-example { color:var(--muted); }
.edit-example-link { font-size:.875rem; }
.lesson-new-copy .ref-code { margin:16px 0; }
.lesson-steps li { padding-left:4px; }
.lesson-steps li::marker { color:var(--brand); font-weight:600; }
.lesson-prediction { color:var(--text); }
.lesson-task-text { color:var(--ink); font-weight:550; }
.lesson-target { margin:16px 0 24px; padding:12px 16px; border-left:2px solid var(--brand); }
.lesson-target strong { color:var(--accent); font-size:.9375rem; }
.lesson-target p { margin:6px 0 0; }
.lesson-new-finish { margin-top:24px; }
.lesson-hint-nested { margin-top:16px; padding-top:12px; border-top:1px solid var(--line); }
.lesson-hint-nested summary { display:flex; align-items:center; min-height:44px; color:var(--accent); font-weight:550; cursor:pointer; }
.lesson-hint-nested summary::before { content:"›"; margin-right:8px; }
.lesson-hint-nested[open] summary::before { transform:rotate(90deg); }
.lesson-hint-nested p,.answer-check p { white-space:pre-line; }
.lesson-guided,.manual-assessment { max-width:760px; padding:24px; margin:24px 0; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.lesson-guided p { margin:8px 0 16px; }
.lesson-guided .btn { max-width:100%; }
.lesson-milestones { padding-left:24px; }
.lesson-milestones li { padding:4px 0; }
.manual-assessment fieldset { min-width:0; padding:0; margin:20px 0; border:0; }
.manual-assessment legend { margin-bottom:12px; font-weight:600; }
.manual-step { display:flex; align-items:flex-start; gap:12px; padding:10px 8px; margin:8px 0; border-radius:8px; cursor:pointer; line-height:1.6; }
.manual-step:hover { background:var(--surface-hover); }
.manual-step input { flex:none; width:20px; height:20px; margin:4px 0 0; accent-color:var(--brand); }
.lesson-end { margin-top:24px; padding:24px 0; border-top:1px solid var(--line); }
.lesson-end-actions { display:flex; flex-wrap:wrap; align-items:center; gap:12px; }
.lesson-end-actions [data-mark-read],.lesson-end-actions [data-mark-practiced] { min-height:44px; padding:10px 14px; border:1px solid var(--control-border); border-radius:8px; background:transparent; color:var(--muted); font-size:.9375rem; font-weight:550; }
.lesson-end-actions [data-mark-read]:hover,.lesson-end-actions [data-mark-practiced]:hover { background:var(--surface-hover); color:var(--ink); }
.lesson-end-actions [data-mark-practiced][aria-pressed="true"] { background:#1b392e; color:var(--green); border-color:#689881; }
.practice-progress-status,.practice-badge { color:var(--muted); font-size:.875rem; line-height:1.6; }
.lesson-source { margin:16px 0 24px; color:var(--muted); font-size:.875rem; }
.lesson-source a { color:var(--accent); }
.lesson-transfer { margin:0 0 24px; }
.lesson-transfer h2 { margin:0 0 12px; font-size:1.375rem; }
.lesson-next { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:16px; margin-top:8px; padding-top:24px; border-top:1px solid var(--line); }
.next-card { padding:20px; text-decoration:none; color:var(--ink); }
.next-card small { display:block; color:var(--muted); }
.next-card strong { display:block; margin-top:8px; font-weight:550; line-height:1.5; }
.next-card:hover { border-color:#5f8781; background:var(--surface-hover); }

/* Temario lateral */
.lesson-side { position:sticky; top:88px; max-height:calc(100dvh - 112px); overflow:auto; padding:12px; border:1px solid var(--line); border-radius:10px; background:var(--surface); scrollbar-width:thin; scrollbar-color:var(--control-border) transparent; overscroll-behavior:contain; }
.side-title { display:flex; flex-direction:column; gap:4px; padding:12px 10px 16px; border-bottom:1px solid var(--line); color:var(--ink); font-size:.875rem; font-weight:600; text-transform:uppercase; letter-spacing:.025em; }
.side-title span { color:var(--muted); font-weight:400; text-transform:none; letter-spacing:normal; }
.side-links { margin-top:12px; }
.side-module { margin:0 0 8px; }
.side-module-title { display:flex; align-items:center; gap:10px; min-height:44px; padding:8px 24px 8px 10px; position:relative; cursor:pointer; list-style:none; color:var(--text); font-size:.875rem; line-height:1.5; }
.side-module-title::-webkit-details-marker { display:none; }
.side-module-title>span { color:var(--accent); font-variant-numeric:tabular-nums; }
.side-module-title strong { font-weight:550; }
.side-module-title::after { content:"⌄"; position:absolute; right:4px; top:50%; transform:translateY(-50%); color:var(--muted); }
.side-module[open]>.side-module-title::after { transform:translateY(-50%) rotate(180deg); }
.side-module-lessons { list-style:none; margin:0; padding:0 0 8px; }
.side-module-lessons li { margin:0; padding:0; }
.side-module-lessons a { display:grid; grid-template-columns:24px minmax(0,1fr) auto; align-items:start; gap:8px; min-height:44px; padding:10px; border-radius:8px; color:var(--muted); font-size:.875rem; line-height:1.5; }
.side-module-lessons a:hover { background:var(--surface-hover); color:var(--ink); }
.side-module-lessons a.active { background:#243e39; color:var(--ink); box-shadow:inset 2px 0 var(--brand); font-weight:550; }
.side-lesson-number { font-size:.875rem; color:var(--muted); font-variant-numeric:tabular-nums; }
.side-module-lessons a.active .side-lesson-number { color:var(--accent); }
.side-all-link { display:block; min-height:44px; padding:14px 10px 4px; border-top:1px solid var(--line); color:var(--accent); font-size:.875rem; }
.lesson-toc-toggle { display:none; }

/* Editor, vista previa y comprobación */
.lab { min-width:0; overflow:hidden; margin:24px 0; border:1px solid var(--line); border-radius:var(--radius); background:var(--navy); }
.lesson-page .lab { margin-top:0; }
.lab-head { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:12px; padding:16px; border-bottom:1px solid var(--line); background:var(--surface); }
.lab-label { display:flex; align-items:center; gap:10px; color:var(--ink); font-size:.9375rem; font-weight:600; }
.lab-badge { padding:3px 8px; border-radius:5px; background:var(--accent-soft); color:var(--accent); font-size:.875rem; font-weight:550; }
.lab-actions { display:flex; flex-wrap:wrap; align-items:center; gap:8px; }
.lab button { min-height:44px; padding:9px 12px; border:1px solid var(--control-border); border-radius:8px; background:transparent; color:var(--text); font-size:.9375rem; font-weight:550; line-height:1.4; }
.lab button:hover { background:var(--surface-hover); border-color:var(--brand); }
.lab button.run,.lab .lesson-verify button { background:var(--brand); border-color:var(--brand); color:#102724; font-weight:600; }
.lab button.run:hover,.lab .lesson-verify button:hover { background:#a8ecdf; }
.lab-main { padding:0; }
.lab-grid { display:grid; grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr); }
.lab-code { min-width:0; }
.editor-label { display:block; padding:12px 18px; border-bottom:1px solid var(--line); background:var(--surface); color:var(--muted); font-size:.875rem; line-height:1.5; }
.code-input { display:block; width:100%; min-height:240px; padding:20px; border:0; border-radius:0; resize:vertical; background:var(--navy); color:#e0ebef; font:400 1rem/1.65 var(--font-code); tab-size:2; white-space:pre; overflow:auto; }
.code-input:focus-visible { outline-offset:-3px; }
.full-lab .code-input { min-height:280px; }
.lab-out { min-width:0; min-height:100px; padding:18px 20px; background:var(--surface); border-top:1px solid var(--line); }
.lab-grid>.lab-out { border-top:0; border-left:1px solid var(--line); }
.full-lab .lab-grid>.lab-out { grid-column:1 / -1; border-top:1px solid var(--line); border-left:0; }
.output { min-height:24px; margin-top:12px; color:var(--text); font:400 1rem/1.65 var(--font-code); white-space:pre-wrap; overflow-wrap:anywhere; }
.output.info { color:var(--muted); }
.output.error { color:var(--red); }
.editor-tabs { display:flex; flex-wrap:wrap; gap:8px; padding:12px 16px; border-bottom:1px solid var(--line); }
.editor-tabs button { min-width:72px; }
.editor-tabs button[aria-pressed="true"],.editor-tabs button[aria-selected="true"],.mobile-panel-switcher button[aria-pressed="true"] { background:#243e39; border-color:var(--brand); color:var(--accent); }
.preview-wrap { min-width:0; background:var(--surface); border-left:1px solid var(--line); }
.preview-frame { display:block; width:100%; height:280px; border:0; background:#fff; }
.preview-status { padding:10px 18px; border-top:1px solid var(--line); background:var(--surface); color:var(--muted); font-size:.875rem; line-height:1.6; }
.mobile-panel-switcher { display:none; }
.lesson-lab-mission { padding:16px 20px; border-bottom:1px solid var(--line); background:var(--surface); }
.lesson-lab-mission strong { display:block; color:var(--accent); font-size:.875rem; font-weight:600; }
.lesson-lab-mission p { margin:6px 0 0; color:var(--ink); font-size:1rem; line-height:1.6; }
.lesson-verify { display:flex; flex-wrap:wrap; align-items:center; gap:12px; padding:20px 20px 0; }
.lesson-feedback { padding:14px 16px; margin:16px 20px 20px; border:1px solid var(--line); border-radius:8px; background:var(--surface); color:var(--text); font-size:1rem; line-height:1.6; }
.lesson-feedback.is-passed { background:#183228; color:#e0f5e8; border-color:#639d80; }
.lesson-feedback.is-failed { background:#322321; color:#ffe0d9; border-color:#b87570; }

/* Ejercicios, tablas y resultados */
.exercise-card h3 { margin:16px 0 10px; font-size:1.125rem; }
.exercise-card p { flex:1; margin-bottom:20px; }
.exercise-card .link { font-size:.9375rem; font-weight:600; }
.card-row { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:8px; }
.exercise-preparation { margin:24px 0; }
.exercise-preparation h2 { margin:0 0 12px; }
.example-table-wrap { max-width:100%; overflow-x:auto; border:1px solid var(--line); border-radius:8px; }
.example-table { width:100%; border-collapse:collapse; table-layout:fixed; text-align:left; font-size:1rem; line-height:1.6; }
.example-table caption { padding:14px 16px; text-align:left; color:var(--ink); font-weight:600; }
.example-table th,.example-table td { padding:14px 16px; border-top:1px solid var(--line); vertical-align:top; overflow-wrap:anywhere; }
.example-table th { background:var(--surface); color:var(--muted); font-size:.9375rem; font-weight:550; }
.example-table th:first-child { width:62%; }
.example-table code { padding:0; background:transparent; font-size:.9375rem; white-space:pre-wrap; }
.exercise-results { display:none; padding:20px; margin:24px 0; border:1px solid var(--line); border-radius:var(--radius); font-size:1rem; }
.exercise-results.visible { display:block; }
.exercise-results.good { background:#183228; color:#d4f3e2; border-color:#639d80; }
.exercise-results.bad { background:#322321; color:#ffe0d9; border-color:#b87570; }
.exercise-results ul { margin:12px 0 0; padding-left:20px; }
.exercise-results li { padding:8px 0; overflow-wrap:anywhere; }
.exercise-results code { background:transparent; color:inherit; white-space:pre-wrap; }
.test-detail { display:block; margin-top:6px; font-size:.875rem; line-height:1.6; }
.search-wrap { position:relative; max-width:640px; margin:20px 0 24px; }
.search-wrap .search-input { padding-left:44px; }
.search-wrap .magnify { position:absolute; top:12px; left:16px; color:var(--muted); }
.search-results a { display:flex; flex-direction:column; gap:6px; padding:18px 4px; border-bottom:1px solid var(--line); }
.search-results a:hover { background:var(--surface); }
.search-results a strong { font-weight:550; }
.search-results small { color:var(--muted); }

/* Glosario y guías de errores */
.ref-hero h1 { overflow-wrap:anywhere; }
.ref-search-controls { padding:24px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.ref-search-controls label { display:block; margin-bottom:12px; font-size:1rem; font-weight:550; }
.ref-search-field { display:flex; align-items:center; gap:10px; padding:0 12px; border:1px solid var(--control-border); border-radius:8px; background:var(--navy); }
.ref-search-field>span { color:var(--muted); font-size:1.5rem; }
.ref-search-field input:not([type=checkbox]):not([type=radio]):not([type=file]) { width:100%; min-width:0; flex:1; padding:12px 0; border:0; background:transparent; }
.ref-search-field:focus-within { outline:3px solid var(--brand); outline-offset:3px; }
.ref-search-field input:focus-visible { outline:0; }
.ref-search-field button { min-height:44px; padding:8px 12px; border:0; border-radius:6px; background:var(--accent-soft); color:var(--accent); font-size:.875rem; font-weight:550; }
.ref-search-field button:hover { background:#284a43; }
.ref-count { margin:12px 0 0; color:var(--muted); font-size:.875rem; }
.ref-group { margin-top:32px; }
.ref-group:first-child { margin-top:0; }
.ref-group-head { display:flex; align-items:baseline; justify-content:space-between; gap:12px; padding-bottom:12px; margin-bottom:16px; border-bottom:1px solid var(--line); }
.ref-group-head h2 { font-size:1.5rem; }
.ref-group-head>span { flex:none; color:var(--muted); font-size:.875rem; }
.ref-grid { gap:16px; }
.ref-card { display:flex; flex-direction:column; gap:10px; padding:20px 24px; transition:background .15s,border-color .15s; }
.ref-card:hover,.ref-card:focus-within { background:var(--surface-hover); border-color:#5f8781; }
.ref-card-top { display:flex; flex-wrap:wrap; align-items:center; gap:8px; }
.ref-kind { color:var(--muted); font-size:.875rem; font-weight:550; line-height:1.5; }
.ref-env { padding:2px 8px; border:1px solid #41635d; border-radius:6px; background:var(--accent-soft); color:#c6eee4; font-size:.875rem; line-height:1.5; }
.ref-card-link { display:flex; align-items:flex-start; justify-content:space-between; gap:12px; color:var(--ink); line-height:1.4; }
.ref-card-link strong { font-size:1.125rem; font-weight:600; overflow-wrap:anywhere; }
.ref-card-link>span { color:var(--accent); }
.ref-card-link:hover strong { text-decoration:underline; }
.ref-card p { margin:0; color:var(--muted); font-size:1rem; line-height:1.6; }
.ref-card-foot { margin-top:auto; padding-top:8px; color:var(--accent); font-size:.9375rem; font-weight:550; }
.ref-card .ref-symptom { padding:8px 10px; border-radius:6px; background:var(--navy); color:var(--text); font:400 .9375rem/1.6 var(--font-code); overflow-wrap:anywhere; }
.ref-empty { padding:24px; margin:24px 0; border:1px dashed var(--control-border); border-radius:var(--radius); color:var(--text); }
.ref-empty p { margin:8px 0 0; }
.ref-diagnosis { margin-top:32px; padding:24px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.ref-diagnosis h2 { margin-bottom:16px; font-size:1.375rem; }
.ref-diagnosis ol { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:24px; margin:0; padding-left:24px; }
.ref-detail-layout { display:grid; grid-template-columns:minmax(0,1fr) 220px; align-items:start; gap:40px; max-width:1060px; padding:32px 0 64px; }
.ref-detail-heading { max-width:1060px; }
.ref-answer { padding:16px 20px; margin-bottom:24px; border-left:2px solid var(--brand); background:var(--surface); color:var(--ink); font-size:1.125rem; line-height:1.7; }
.ref-answer-error { font-size:1.0625rem; }
.ref-answer-error p { margin:0 0 10px; }
.ref-answer-error p:last-child { margin:0; }
.ref-code { min-width:0; max-width:100%; overflow:hidden; border:1px solid var(--line); border-radius:10px; background:var(--navy); color:#e0ebef; }
.ref-code-title { display:flex; align-items:center; justify-content:space-between; gap:12px; padding:12px 16px; border-bottom:1px solid var(--line); background:var(--surface); color:var(--muted); font-size:.875rem; font-weight:500; }
.ref-code-title>span:last-child { flex:none; color:var(--accent); font-family:var(--font-code); }
.ref-code pre { max-width:100%; padding:20px; margin:0; border:0; border-radius:0; background:transparent; color:inherit; font-size:1rem; line-height:1.65; white-space:pre; }
.ref-code-compare { display:grid; grid-template-columns:minmax(0,1fr); gap:16px; }
.ref-code-compare>div { min-width:0; }
.ref-links { padding-top:20px; margin-top:32px; border-top:1px solid var(--line); color:var(--muted); font-size:.9375rem; line-height:1.7; }
.ref-links p { margin-bottom:12px; }
.ref-links a { color:var(--accent); text-decoration:underline; }
.ref-links .ref-source { margin-top:20px; font-size:.875rem; color:var(--muted); }
.ref-aside { position:sticky; top:88px; padding:20px; border:1px solid var(--line); border-radius:10px; background:var(--surface); color:var(--muted); font-size:.9375rem; line-height:1.6; }
.ref-aside .caps { display:block; margin-bottom:8px; }
.ref-aside p { margin-bottom:16px; }
.ref-aside a { color:var(--accent); font-size:.9375rem; text-decoration:underline; }
.ref-card[id] { scroll-margin-top:88px; }

/* Proyectos y demos */
.project-card { overflow:hidden; display:flex; flex-direction:column; }
.project-art { display:flex; align-items:center; justify-content:center; min-height:144px; padding:20px; border-bottom:1px solid var(--line); }
.art-quiz { background:#24263b; }
.art-tasks { background:#20352d; }
.art-catalog { background:#383125; }
.art-api { background:#233340; }
.art-inner { min-width:70%; padding:16px; border:1px solid #667879; border-radius:8px; background:var(--surface); text-align:center; font-size:.9375rem; font-weight:550; }
.art-inner span { display:block; margin-top:4px; color:var(--muted); font-size:.875rem; }
.project-body { display:flex; flex:1; flex-direction:column; padding:24px; }
.project-body h3 { margin:12px 0; font-size:1.125rem; }
.project-body p { margin-bottom:20px; }
.project-body .link { margin-top:auto; font-size:.9375rem; }
.project-detail .article { width:100%; max-width:none; }
.project-detail #demo { scroll-margin-top:88px; }
.project-demo { padding:24px; margin:20px 0 24px; border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); }
.project-demo h3 { margin:12px 0 16px; }
.project-demo h3:focus { outline:2px solid var(--brand); outline-offset:6px; }
.project-demo label { display:block; margin-bottom:8px; font-size:.9375rem; font-weight:550; }
.demo-input-row { display:flex; align-items:flex-end; gap:12px; margin-bottom:20px; }
.demo-input-row>input,.demo-input-row>div { flex:1; min-width:0; }
.demo-input-row input,.demo-input-row select { width:100%; }
.demo-actions { display:flex; flex-wrap:wrap; gap:10px; margin:16px 0; }
.project-demo button { min-height:44px; padding:10px 14px; border:1px solid var(--control-border); border-radius:8px; background:transparent; color:var(--text); font-size:1rem; line-height:1.4; }
.project-demo button:hover { border-color:var(--brand); background:var(--surface-hover); }
.project-demo button.primary { background:var(--brand); border-color:var(--brand); color:#102724; font-weight:600; }
.project-demo button[aria-pressed="true"] { background:#243e39; border-color:var(--brand); color:var(--ink); }
.demo-stack { display:flex; flex-direction:column; gap:12px; }
.project-demo .demo-tasks { list-style:none; padding:0; margin:16px 0 0; }
.demo-tasks li { display:flex; align-items:center; gap:12px; padding:14px 0; margin:0; border-bottom:1px solid var(--line); }
.demo-tasks li:last-child { border-bottom:0; }
.demo-tasks li span { flex:1; min-width:0; overflow-wrap:anywhere; }
.demo-tasks li.completed span { color:var(--muted); text-decoration:line-through; }
.demo-tasks button { min-width:44px; flex:none; padding:8px; }
.demo-products { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:16px; margin-top:20px; }
.demo-products>div { min-width:0; padding:16px; border:1px solid var(--line); border-radius:8px; }
.demo-products p { margin:8px 0 0; }
.project-demo [data-api-out] { min-height:44px; padding:8px 0; color:var(--text); }
.project-demo [data-api-out] p:last-child { margin-bottom:0; }

/* Pie común */
.site-footer { padding:48px 0 24px; border-top:1px solid var(--line); background:var(--bg); color:var(--muted); }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:32px; }
.footer-brand { color:var(--ink); }
.footer-desc { max-width:34ch; margin:16px 0 12px; font-size:.9375rem; line-height:1.65; }
.footer-note { color:var(--muted); }
.site-footer h4 { margin-bottom:12px; color:var(--ink); font-size:.9375rem; font-weight:550; }
.site-footer ul { padding:0; margin:0; list-style:none; }
.site-footer li { margin-bottom:8px; font-size:.9375rem; line-height:1.6; }
.site-footer a:hover { color:var(--accent); text-decoration:underline; }
.footer-bottom { display:flex; flex-wrap:wrap; justify-content:space-between; gap:12px 24px; padding-top:20px; margin-top:32px; border-top:1px solid var(--line); font-size:.875rem; line-height:1.6; }

/* Ajustes por anchura: la lectura conserva tamaño, el diseño pierde columnas. */
@media(max-width:1020px) {
  .site-nav { display:none; }
  .menu-btn { display:inline-flex; gap:8px; padding:9px 12px; width:auto; }
  .mobile-nav.open { display:flex; flex-direction:column; gap:4px; padding:12px 0; max-height:65dvh; overflow:auto; border-top:1px solid var(--line); }
  .mobile-nav a { min-height:44px; padding:10px 12px; border-radius:8px; font-size:1rem; }
  .mobile-nav a:hover { background:var(--surface-hover); }
  .hero-grid { gap:28px; }
  .grid-4 { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .lesson-layout { grid-template-columns:230px minmax(0,1fr); gap:28px; }
}
@media(max-width:900px) {
  .ref-detail-layout { grid-template-columns:minmax(0,1fr); gap:24px; }
  .ref-aside { position:static; display:flex; align-items:baseline; flex-wrap:wrap; gap:8px 16px; }
  .ref-aside p { margin:0; }
  .ref-diagnosis ol { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .footer-grid { grid-template-columns:2fr 1fr 1fr; gap:24px; }
  .footer-grid>div:last-child { grid-column:2 / 4; }
}
@media(max-width:860px) {
  .hero-grid { grid-template-columns:minmax(0,1fr); gap:32px; }
  .hero h1 { max-width:22ch; }
  .hero-demo { max-width:650px; }
  .section-head { align-items:flex-start; }
  .grid-3 { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .lesson-layout { display:block; }
  .lesson-side { display:none; position:static; max-height:60dvh; margin-bottom:24px; }
  .lesson-side.mobile-open { display:block; }
  .lesson-toc-toggle { display:inline-flex; width:auto; margin-bottom:20px; }
  .lab-grid { grid-template-columns:minmax(0,1fr); }
  .lab-grid>.lab-out,.preview-wrap { border-left:0; border-top:1px solid var(--line); }
  .lab-actions { flex:1; justify-content:flex-end; }
  .promo { align-items:flex-start; flex-direction:column; gap:24px; }
}
@media(max-width:650px) {
  .ref-code-compare { grid-template-columns:minmax(0,1fr); }
}
@media(max-width:600px) {
  body { font-size:1rem; }
  .container,.narrow { width:calc(100% - 36px); }
  .header-inner { min-height:64px; gap:12px; }
  .brand { gap:8px; font-size:.9375rem; }
  .brand-icon { width:32px; height:32px; }
  .hero { padding:36px 0 44px; }
  .hero h1 { font-size:clamp(2rem,8.2vw,2.375rem); }
  .hero .lead,.lead { font-size:1.0625rem; }
  .hero .actions { align-items:stretch; flex-direction:column; }
  .hero .actions .btn { min-height:48px; }
  .hero-proof { gap:8px 12px; }
  .hero-code { padding:20px; }
  .hero-demo-bottom { padding:18px 20px; }
  .page-hero,.ref-hero { padding:28px 0; }
  .page-hero h1,.ref-hero h1 { font-size:2rem; }
  .page-pad,.ref-main,.ref-detail-layout { padding-top:24px; padding-bottom:48px; }
  .crumb { margin-bottom:16px; }
  .section-head { flex-direction:column; gap:20px; margin-bottom:24px; }
  .grid-3,.grid-4,.glass-grid,.modules-list,.ref-grid { grid-template-columns:minmax(0,1fr); gap:16px; }
  .feature,.link-card,.exercise-card,.ref-card { padding:20px; }
  .numbers-row { gap:20px 24px; }
  .stat { min-width:40%; }
  .stat strong { font-size:1.75rem; }
  .module-link { padding:16px; gap:12px; }
  .promo { padding:24px; }
  .article,.prose,.ref-article { font-size:1rem; }
  .prose { padding:24px 20px; }
  .article h2,.prose h2,.ref-article h2 { font-size:1.5rem; margin-top:28px; }
  .note,.ref-note,.lesson-mistake { padding:14px 16px; }
  .disclosure>div { padding:16px; }
  .course-toolbar { padding:20px; gap:16px; }
  .course-progress { flex-basis:100%; max-width:none; }
  .course-toolbar .actions { width:100%; }
  .course-module>summary { padding:16px; gap:12px; }
  .course-lessons a { align-items:flex-start; gap:10px; padding:12px 16px; }
  .course-lessons .pill { display:none; }
  .lesson-main h1 { font-size:1.875rem; }
  .lesson-concept { font-size:1.0625rem; }
  .lesson-toc-toggle { max-width:100%; font-size:.9375rem; }
  .lesson-prerequisites { margin-bottom:20px; }
  .lesson-next { grid-template-columns:minmax(0,1fr); }
  .lesson-end-actions { align-items:stretch; flex-direction:column; }
  .lesson-end-actions .practice-progress-status { padding-top:4px; }
  .lesson-transfer .btn { width:100%; }
  .manual-assessment,.lesson-guided { padding:20px; }
  .lab-head { align-items:stretch; padding:16px; }
  .lab-label { flex-basis:100%; }
  .lab-actions { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); width:100%; gap:8px; }
  .lab-actions .run { grid-column:1 / -1; }
  .lab-actions button { padding-inline:8px; font-size:.875rem; }
  .code-input { min-height:240px; padding:16px; font-size:1rem; }
  .full-lab .code-input { min-height:260px; }
  .editor-label { padding:12px 16px; }
  .lab-out { padding:16px; }
  .editor-tabs { padding:12px 16px; }
  .editor-tabs button { min-width:0; flex:1; }
  .mobile-panel-switcher { display:flex; gap:8px; padding:12px 16px; border-bottom:1px solid var(--line); }
  .mobile-panel-switcher button { flex:1; min-width:0; padding-inline:8px; font-size:.875rem; }
  .full-lab[data-mobile-panel="code"] .preview-wrap,.full-lab[data-mobile-panel="code"] .lab-out { display:none; }
  .full-lab[data-mobile-panel="result"] .lab-code,.full-lab[data-mobile-panel="result"] .lab-out { display:none; }
  .full-lab[data-mobile-panel="console"] .lab-code,.full-lab[data-mobile-panel="console"] .preview-wrap { display:none; }
  .full-lab[data-mobile-panel="console"] .lab-out { display:block; }
  .full-lab .preview-frame { height:300px; }
  .lesson-lab-mission { padding:16px; }
  .lesson-verify { padding:16px 16px 0; }
  .lesson-verify button { width:100%; }
  .lesson-feedback { margin:16px; font-size:1rem; }
  .example-table th,.example-table td { padding:12px 10px; }
  .example-table code { font-size:.875rem; }
  .ref-search-controls { padding:20px; }
  .ref-filters { margin:20px 0 28px; }
  .ref-diagnosis { padding:20px; }
  .ref-diagnosis ol { grid-template-columns:minmax(0,1fr); gap:12px; }
  .ref-code pre { padding:16px; }
  .ref-code-title { padding:12px 16px; }
  .ref-answer { padding:16px; font-size:1.0625rem; }
  .project-body { padding:20px; }
  .project-demo { padding:20px; }
  .demo-input-row { flex-direction:column; align-items:stretch; }
  .demo-products { grid-template-columns:minmax(0,1fr); }
  .footer-grid { grid-template-columns:repeat(2,minmax(0,1fr)); gap:24px; }
  .footer-grid>div:first-child,.footer-grid>div:last-child { grid-column:1 / -1; }
  .footer-grid>div:last-child ul { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:4px 20px; }
  .footer-bottom { margin-top:24px; }
}
@media(max-width:480px) {
  .header-actions .search-btn { display:none; }
}
@media(max-width:360px) {
  .container,.narrow { width:calc(100% - 28px); }
  .brand { font-size:.875rem; }
  .brand-icon { width:28px; height:28px; }
  .page-hero h1,.ref-hero h1,.lesson-main h1 { font-size:1.75rem; }
  .ref-search-field>span { display:none; }
}

/* Preferencias de acceso e impresión */
@media(prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto; }
  *,*::before,*::after { animation:none!important; transition:none!important; }
}
@media(prefers-contrast:more) {
  :root { --muted:#dce5eb; --line:#788991; --control-border:#93a7af; }
}
@media(forced-colors:active) {
  :root { --bg:Canvas; --surface:Canvas; --surface-hover:Canvas; --ink:CanvasText; --text:CanvasText; --muted:CanvasText; --line:CanvasText; --control-border:ButtonText; --accent:LinkText; --brand:Highlight; }
  .btn,.icon-btn,.lab button { border:1px solid ButtonText; }
  :where(a,button,input,textarea,select,summary):focus-visible { outline-color:Highlight; }
  .side-module-lessons a.active { border-left:3px solid Highlight; }
}
@media print {
  :root { --bg:#fff; --surface:#fff; --surface-hover:#fff; --ink:#000; --text:#222; --muted:#444; --line:#bbb; --accent:#000; --navy:#f4f4f4; }
  html { scroll-behavior:auto; }
  body { background:#fff; color:#000; font-size:11pt; }
  .site-header,.site-footer,.lesson-side,.lesson-toc-toggle,.btn,.lab,.course-toolbar,.ref-search-controls,.ref-filters,.manual-assessment button { display:none!important; }
  .print-only { display:block; }
  .container,.narrow { width:100%; max-width:none; }
  .page-pad,.ref-detail-layout { padding:0; }
  .lesson-layout,.ref-detail-layout { display:block; }
  .prose,.ref-aside { padding:0; border:0; }
  .ref-aside { position:static; margin-top:24px; }
  .ref-code { color:#222; }
  .article,.lesson-new-copy,.lesson-new-finish,.ref-article { max-width:none; }
}