/* Laboratorio IA · Día 4 — estilos compartidos + guía en modo laboratorio.
   Contrato de diseño: assets/DESIGN.md (sistema visual tomado del deck NTT DATA
   "Agentic AI en la práctica"). Primitivas de estado y bloque de código adaptadas
   de Beautiful UI (MIT © 2026 Shane Levine), ver assets/vendor/NOTICE.md. */

/* ── Fuentes (OFL 1.1, ver assets/fonts/OFL-*.txt) ───────────────── */
@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 500 800;
  font-display: swap;
  src: url(fonts/montserrat-normal-500-800-latin.woff2) format('woff2');
}
@font-face {
  font-family: 'Montserrat';
  font-style: italic;
  font-weight: 600 800;
  font-display: swap;
  src: url(fonts/montserrat-italic-600-800-latin.woff2) format('woff2');
}
/* Carlito: métrica idéntica a Calibri, la fuente de texto del deck */
@font-face { font-family: 'Carlito'; font-style: normal; font-weight: 400; font-display: swap; src: url(fonts/carlito-normal-400-latin.woff2) format('woff2'); }
@font-face { font-family: 'Carlito'; font-style: normal; font-weight: 700; font-display: swap; src: url(fonts/carlito-normal-700-latin.woff2) format('woff2'); }
@font-face { font-family: 'Carlito'; font-style: italic; font-weight: 400; font-display: swap; src: url(fonts/carlito-italic-400-latin.woff2) format('woff2'); }
@font-face { font-family: 'Carlito'; font-style: italic; font-weight: 700; font-display: swap; src: url(fonts/carlito-italic-700-latin.woff2) format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url(fonts/ibm-plex-mono-normal-400-latin.woff2) format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url(fonts/ibm-plex-mono-normal-500-latin.woff2) format('woff2'); }

/* ── Tokens ───────────────────────────────────────────────────────
   Valores medidos en el deck (slide XML + barras de sesión):
   tinta #070E25 · texto #2D404D · panel #F4F6F9 · tinte #E6F1F8 · línea #D9E3EF
   azul NTT #0071BB · azul brillante #18A2FB · S2 #005B95 · S3 #00CD5D · S4 #FF7F00 · HITL #FFC600
   light-dark() sigue a color-scheme: sistema, o el tema elegido (data-theme). */
:root {
  color-scheme: light dark;

  --navy:        #070E25;
  --navy-2:      #0B1533;
  --navy-3:      #13234A;
  --on-navy:     #FFFFFF;
  --on-navy-2:   #D9E3EF;
  --on-navy-3:   #A9BAD0;
  --bright:      #18A2FB;

  --page:        light-dark(#FFFFFF, #050B1E);
  --surface:     light-dark(#FFFFFF, #0A1430);
  --inset:       light-dark(#F4F6F9, #0F1D40);
  --tint:        light-dark(#E6F1F8, #112652);
  --hover:       light-dark(rgb(7 14 37 / .05), rgb(217 227 239 / .07));
  --line:        light-dark(#D9E3EF, #1C2B52);
  --line-strong: light-dark(#B8C2D0, #2C3E6B);
  --ink:         light-dark(#070E25, #FFFFFF);
  --ink-2:       light-dark(#2D404D, #D9E3EF);
  --ink-3:       light-dark(#5A6472, #A9BAD0);
  --brand:       light-dark(#0071BB, #18A2FB);
  --brand-ink:   light-dark(#FFFFFF, #070E25);
  --signal:      var(--brand);
  --signal-tint: var(--tint);
  --green:       light-dark(#0F6B45, #00CD5D);
  --green-hue:   light-dark(#00A84C, #00CD5D);
  --green-tint:  light-dark(#E8FAF0, #0B2E26);
  --red:         light-dark(#C8372D, #FF4D4D);
  --amber:       light-dark(#7A5B00, #FFC600);
  --yellow:      #FFC600;
  --amber-tint:  light-dark(#FFF7E6, #2A2410);
  --code-bg:     #070E25;
  --code-head:   #0B1533;
  --code-ink:    #E6EEF8;
  --code-mute:   #8A9AB0;
  --code-line:   light-dark(#070E25, #1C2B52);

  /* Sesión activa: barra (hue), texto sobre claro (ink) y sobre navy (glow) */
  --s1-hue: #0071BB; --s1-ink: light-dark(#0071BB, #18A2FB); --s1-glow: #18A2FB;
  --s2-hue: light-dark(#005B95, #1E78CC); --s2-ink: light-dark(#005B95, #5AB4F5); --s2-glow: #5AB4F5;
  --s3-hue: #00CD5D; --s3-ink: light-dark(#0F6B45, #00CD5D); --s3-glow: #00CD5D;
  --s4-hue: #FF7F00; --s4-ink: light-dark(#B35600, #FF7F00); --s4-glow: #FF7F00;
  --sess-hue: var(--brand); --sess-ink: var(--brand); --sess-glow: var(--bright);

  --font-display: 'Montserrat', 'Segoe UI', Arial, sans-serif;
  --font-sans: Calibri, 'Carlito', 'Segoe UI', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --r-chip: 2px;
  --r-control: 2px;
  --r-panel: 0px;
  --mast-h: 56px;
  --bar-h: 4px;
  --ease-out-strong: cubic-bezier(.23, 1, .32, 1);

  /* Tema daisyUI (btn, kbd, join, progress, checkbox) derivado de los tokens */
  --color-base-100: var(--surface);
  --color-base-200: var(--inset);
  --color-base-300: var(--line);
  --color-base-content: var(--ink);
  --color-primary: var(--brand);
  --color-primary-content: var(--brand-ink);
  --color-secondary: var(--ink-2);
  --color-secondary-content: var(--surface);
  --color-accent: var(--bright);
  --color-accent-content: var(--navy);
  --color-neutral: var(--navy);
  --color-neutral-content: #FFFFFF;
  --color-info: var(--brand);
  --color-info-content: var(--brand-ink);
  --color-success: var(--green-hue);
  --color-success-content: #FFFFFF;
  --color-warning: var(--yellow);
  --color-warning-content: var(--navy);
  --color-error: var(--red);
  --color-error-content: #FFFFFF;
  --radius-selector: .125rem;
  --radius-field: .125rem;
  --radius-box: 0rem;
  --size-selector: .25rem;
  --size-field: .25rem;
  --border: 1px;
  --depth: 0;
  --noise: 0;
}
:root[data-theme="bcp"] { color-scheme: light; }
:root[data-theme="bcp-dark"] { color-scheme: dark; }
:root[data-session="s1"] { --sess-hue: var(--s1-hue); --sess-ink: var(--s1-ink); --sess-glow: var(--s1-glow); }
:root[data-session="s2"] { --sess-hue: var(--s2-hue); --sess-ink: var(--s2-ink); --sess-glow: var(--s2-glow); }
:root[data-session="s3"] { --sess-hue: var(--s3-hue); --sess-ink: var(--s3-ink); --sess-glow: var(--s3-glow); }
:root[data-session="s4"] { --sess-hue: var(--s4-hue); --sess-ink: var(--s4-ink); --sess-glow: var(--s4-glow); }
:root[data-session="gate"] { --sess-hue: var(--yellow); --sess-ink: var(--amber); --sess-glow: var(--yellow); }
/* Cada sección lleva su color aunque no sea la activa (vista completa) */
#s1, [data-session-scope="s1"] { --sess-hue: var(--s1-hue); --sess-ink: var(--s1-ink); --sess-glow: var(--s1-glow); }
#s2, [data-session-scope="s2"] { --sess-hue: var(--s2-hue); --sess-ink: var(--s2-ink); --sess-glow: var(--s2-glow); }
#s3, [data-session-scope="s3"] { --sess-hue: var(--s3-hue); --sess-ink: var(--s3-ink); --sess-glow: var(--s3-glow); }
#s4, [data-session-scope="s4"] { --sess-hue: var(--s4-hue); --sess-ink: var(--s4-ink); --sess-glow: var(--s4-glow); }
#gate-g2, [data-session-scope="gate"] { --sess-hue: var(--yellow); --sess-ink: var(--amber); --sess-glow: var(--yellow); }

/* ── Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: calc(var(--mast-h) + var(--bar-h) + 1rem); }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink-2);
  font: 400 1.0625rem/1.6 var(--font-sans);
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3, h4, p, ul, ol, dl, dd, pre, figure { margin: 0; }
ul, ol { padding: 0; }
/* Fuera de capa: no tocar a.btn (daisyUI vive en @layer) */
:where(a:not(.btn)) { color: var(--brand); text-underline-offset: .18em; text-decoration-thickness: 1px; }
:where(a:not(.btn)):hover { text-decoration-thickness: 2px; }
strong { font-weight: 700; color: var(--ink); }
em { font-style: italic; }
code, kbd, pre, samp { font-family: var(--font-mono); }
:where(p, li, dd, td, h4, .step-desc, .step-tip, .path-desc, .path-note) code {
  font-size: .82em;
  padding: .1em .36em;
  border-radius: var(--r-chip);
  background: var(--tint);
  color: var(--ink);
  overflow-wrap: break-word;
}
::selection { background: color-mix(in srgb, var(--bright) 30%, transparent); }
:focus-visible { outline: 2px solid var(--bright); outline-offset: 2px; }
[tabindex="-1"]:focus { outline: none; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.ic { width: 1.125rem; height: 1.125rem; flex: none; fill: currentColor; }
.ic-sm { width: .875rem; height: .875rem; }

/* Etiqueta del deck: Montserrat bold, versalitas con tracking amplio */
.eyebrow, .intro-kicker, .s-kicker, .path-kind, .prereq-kind, .rail-title, .lab-crumb, .lab-progress-label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .6875rem;
  line-height: 1.4;
  letter-spacing: .2em;
  text-transform: uppercase;
}
/* Titular de dos tonos del deck: segunda cláusula en cursiva y color */
.t-accent { font-style: italic; color: var(--sess-ink); }

.skip-link {
  position: fixed; top: .5rem; left: .5rem; z-index: 100;
  padding: .5rem .75rem;
  background: var(--bright); color: var(--navy); font-weight: 700;
  transform: translateY(-160%); transition: transform .15s;
}
.skip-link:focus { transform: none; }

/* ── Masthead navy con logo NTT DATA (ambas páginas) ─────────────── */
.mast {
  position: sticky; top: 0; z-index: 40;
  height: calc(var(--mast-h) + var(--bar-h));
  display: flex; align-items: stretch; gap: 1.5rem;
  padding: 0 clamp(1rem, 3vw, 2rem) var(--bar-h);
  background: var(--navy);
  color: var(--on-navy);
  border-bottom: 0;
}
/* Barra de color de la sesión, como en cada lámina del deck */
.mast::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: var(--bar-h);
  background: var(--sess-hue);
  transition: background-color .3s;
}
.mast-brand {
  display: flex; align-items: center; gap: .875rem; min-width: 0;
  color: var(--on-navy); text-decoration: none;
}
.mast-logo { display: block; width: auto; height: 1.375rem; }
.mast-name {
  padding-left: .875rem; border-left: 1px solid rgb(255 255 255 / .22);
  font: 700 .9375rem/1.2 var(--font-display); letter-spacing: -.005em; white-space: nowrap;
}
.mast-org {
  color: var(--on-navy-3); white-space: nowrap;
  font: 700 .625rem/1 var(--font-display); letter-spacing: .2em; text-transform: uppercase;
}
.mast-nav { display: flex; align-items: stretch; gap: .25rem; margin-left: auto; }
.mast-link {
  position: relative; display: flex; align-items: center; gap: .45rem;
  padding: 0 .875rem; color: var(--on-navy-3); text-decoration: none;
  font: 600 .875rem/1 var(--font-display); white-space: nowrap;
}
.mast-link:hover { color: var(--on-navy); }
.mast-link[aria-current="page"] { color: var(--on-navy); }
.mast-link[aria-current="page"]::after {
  content: ""; position: absolute; left: .875rem; right: .875rem; bottom: 0;
  height: 3px; background: var(--bright);
}
.mast-theme { align-self: center; color: var(--on-navy-2); }
.mast-theme:hover { background: rgb(255 255 255 / .08); color: var(--on-navy); }
.mast-theme .ic { width: 1.125rem; height: 1.125rem; }
.icon-sun { display: none; }
:root[data-theme-effective="dark"] .icon-sun { display: block; }
:root[data-theme-effective="dark"] .icon-moon { display: none; }

/* daisyUI btn: tipografía del deck, esquinas rectas */
.btn { font-family: var(--font-display); font-weight: 600; gap: .375rem; letter-spacing: 0; text-decoration: none; }
.btn .ic { width: 1rem; height: 1rem; }
.btn-sm { --fontsize: .8125rem; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.kbd { font-family: var(--font-mono); font-size: .75rem; color: var(--ink-2); }

/* ── Bloque de código: terminal navy (Beautiful UI #code-block) ───── */
.code {
  position: relative;
  margin: 1rem 0 .25rem;
  border: 1px solid var(--code-line);
  border-radius: var(--r-panel);
  background: var(--code-bg);
  overflow: hidden;
}
.code-head {
  display: flex; align-items: center; gap: .5rem;
  height: 2.25rem; padding: 0 .375rem 0 .875rem;
  background: var(--code-head);
  border-bottom: 1px solid rgb(255 255 255 / .08);
  color: var(--on-navy-3);
  font: 400 .75rem/1 var(--font-mono);
}
.code-head::before {
  content: ""; width: 3px; height: 1rem; margin-right: .125rem; background: var(--sess-glow);
}
.code-head .ic { width: .9375rem; height: .9375rem; }
.code-lines { font-variant-numeric: tabular-nums; }
.copy-btn {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: .35rem;
  height: 1.625rem; padding: 0 .625rem;
  border: 1px solid rgb(255 255 255 / .16); border-radius: var(--r-control);
  background: transparent; color: var(--on-navy-2);
  font: 600 .75rem/1 var(--font-display); cursor: pointer;
  transition: background-color .12s, color .12s, border-color .12s;
}
.copy-btn .ic { width: .8125rem; height: .8125rem; }
.copy-btn:hover { background: rgb(255 255 255 / .08); color: #fff; border-color: rgb(255 255 255 / .3); }
.copy-btn.is-copied { color: #00CD5D; border-color: #00CD5D; }
.copy-btn.is-failed { color: #FF4D4D; border-color: #FF4D4D; }
.code pre {
  margin: 0; padding: .9375rem 1.125rem 1.0625rem;
  overflow-x: auto;
  font-size: .8125rem; line-height: 1.7;
  color: var(--code-ink);
  tab-size: 4;
  scrollbar-width: thin;
  scrollbar-color: var(--navy-3) transparent;
}
.code-comment { color: var(--code-mute); }

/* ── Aviso efímero (copiado, tema, avance) ─────────────────────────── */
.live-toast {
  position: fixed; left: 50%; bottom: 1.25rem; z-index: 60;
  padding: .625rem 1rem;
  background: var(--navy); color: #fff;
  border-left: 4px solid var(--bright);
  font: 600 .8125rem/1.3 var(--font-display);
  opacity: 0; transform: translate(-50%, 6px); pointer-events: none;
  transition: opacity .18s, transform .18s var(--ease-out-strong);
}
.live-toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* ══ GUÍA ════════════════════════════════════════════════════════════ */
.guide-shell {
  display: grid;
  grid-template-columns: 17.5rem minmax(0, 52rem);
  justify-content: center;
  column-gap: clamp(2rem, 4vw, 4rem);
  padding: 0 clamp(1rem, 3vw, 2rem);
}

/* ── Rail: avance + agenda del día ─────────────────────────────────── */
.rail { position: relative; }
.rail-toggle { display: none; }
.rail-panel {
  position: sticky; top: calc(var(--mast-h) + var(--bar-h) + 1.5rem);
  max-height: calc(100vh - var(--mast-h) - var(--bar-h) - 3rem);
  overflow-y: auto; overscroll-behavior: contain;
  margin-top: 2rem; padding: 0 .25rem 1.5rem 0;
  scrollbar-width: thin;
}
.lab-progress {
  margin: 0 0 1.25rem; padding: 1rem 1rem .875rem;
  background: var(--navy); color: var(--on-navy-2);
  border-left: 4px solid var(--bright);
}
.lab-progress-label { color: var(--bright); }
.lab-progress-count {
  display: flex; align-items: baseline; gap: .375rem; margin-top: .25rem;
  font: 800 1.75rem/1.1 var(--font-display); color: #fff; letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}
.lab-progress-count small { font: 600 .8125rem/1 var(--font-display); color: var(--on-navy-3); letter-spacing: 0; }
.lab-progress .progress { height: .375rem; margin-top: .625rem; color: var(--bright); background-color: rgb(255 255 255 / .12); }
.lab-progress-note { margin-top: .5rem; font-size: .8125rem; line-height: 1.35; color: var(--on-navy-3); }
.lab-reset {
  margin-top: .5rem; padding: 0; border: 0; background: none; cursor: pointer;
  color: var(--on-navy-2); font: 600 .75rem/1.4 var(--font-display); text-decoration: underline; text-underline-offset: .2em;
}
.lab-reset:hover { color: #fff; }
.lab-reset.is-armed { color: var(--yellow); }

.rail-title { margin: 0 0 .5rem .625rem; color: var(--ink-3); }
.agenda { list-style: none; }
.ag-link, .ag-break {
  display: grid; grid-template-columns: 2.75rem 1fr auto; align-items: baseline;
  min-height: 2.25rem; padding: .4rem .625rem;
  font-size: .9375rem; line-height: 1.3;
}
.ag-link {
  position: relative; color: var(--ink-2); text-decoration: none;
  font-family: var(--font-display); font-weight: 600; font-size: .875rem;
  border-left: 3px solid transparent;
}
.ag-item[data-session] .ag-link { --sess-hue: inherit; }
.ag-item[data-session="s1"] { --sess-hue: var(--s1-hue); --sess-ink: var(--s1-ink); }
.ag-item[data-session="s2"] { --sess-hue: var(--s2-hue); --sess-ink: var(--s2-ink); }
.ag-item[data-session="s3"] { --sess-hue: var(--s3-hue); --sess-ink: var(--s3-ink); }
.ag-item[data-session="s4"] { --sess-hue: var(--s4-hue); --sess-ink: var(--s4-ink); }
.ag-link:hover { background: var(--hover); color: var(--ink); }
.ag-time { font: 400 .75rem/1 var(--font-mono); color: var(--ink-3); font-variant-numeric: tabular-nums; }
.ag-code { color: var(--sess-ink); font-weight: 800; margin-right: .2rem; }
.ag-count { font: 500 .6875rem/1 var(--font-mono); color: var(--ink-3); font-variant-numeric: tabular-nums; }
.ag-count.is-complete { color: var(--green); }
.ag-link[aria-current] { color: var(--ink); background: var(--inset); border-left-color: var(--sess-hue, var(--brand)); }
.ag-break { grid-template-columns: 2.75rem 1fr; color: var(--ink-3); font-size: .8125rem; padding-left: calc(.625rem + 3px); }
.ag-break .ag-name { display: flex; align-items: center; gap: .5rem; }
.ag-break .ag-name::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.ag-steps {
  list-style: none;
  margin: .125rem 0 .625rem 3.375rem;
  border-left: 1px solid var(--line);
}
.js .ag-item:not(.is-open) .ag-steps { display: none; }
.ag-steps a {
  display: grid; grid-template-columns: 1rem 1.5rem 1fr; align-items: baseline; column-gap: .25rem;
  margin-left: -1px; padding: .28rem .5rem .28rem .625rem;
  border-left: 2px solid transparent;
  color: var(--ink-3); text-decoration: none;
  font-size: .875rem; line-height: 1.3;
}
.ag-steps a:hover { color: var(--ink); background: var(--hover); }
.ag-steps a[aria-current] { color: var(--ink); border-left-color: var(--sess-hue); background: var(--inset); font-weight: 700; }
.ag-n { font: 500 .6875rem/1 var(--font-mono); font-variant-numeric: tabular-nums; }
.ag-s { overflow: hidden; overflow-wrap: anywhere; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
/* Estado del paso (marcado manual, local) */
.ag-dot {
  align-self: center; width: .625rem; height: .625rem; border-radius: 50%;
  border: 1.5px solid var(--line-strong); background: transparent;
}
a[aria-current] > .ag-dot { border-color: var(--sess-hue); background: var(--sess-hue); }
.is-done > .ag-dot {
  width: .75rem; height: .75rem; border: 0;
  background: var(--green-hue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3.2 6.2l1.8 1.8 3.8-4' fill='none' stroke='white' stroke-width='1.7' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
}
.ag-check a { color: var(--ink-3); }
.ag-check .ag-n { font-family: var(--font-display); font-weight: 700; font-size: .625rem; letter-spacing: .08em; }

/* ── Columna de trabajo ─────────────────────────────────────────── */
.content { padding: 2rem 0 4rem; min-width: 0; }

/* Barra del laboratorio: dónde estoy + vista */
.lab-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1.25rem;
  margin-bottom: 1.5rem; padding-bottom: .875rem;
  border-bottom: 1px solid var(--line);
}
.lab-crumb { display: flex; flex-wrap: wrap; gap: .25rem .625rem; align-items: baseline; color: var(--ink-3); min-width: 0; }
.lab-crumb b { color: var(--sess-ink); font-weight: 800; }
.lab-crumb span + span::before { content: "/"; margin-right: .625rem; color: var(--line-strong); }
.lab-view { margin-left: auto; display: inline-flex; padding: 2px; background: var(--inset); border: 1px solid var(--line); }
.lab-view button {
  height: 1.875rem; padding: 0 .75rem; border: 0; background: transparent; cursor: pointer;
  color: var(--ink-3); font: 600 .75rem/1 var(--font-display);
}
.lab-view button:hover { color: var(--ink); }
.lab-view button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 0 0 1px var(--line-strong); }

/* Paneles: en "paso a paso" sólo uno visible; hidden="until-found" deja buscar con Ctrl+F */
.view-step [data-panel][hidden] { display: block; padding: 0 !important; margin: 0 !important; border: 0 !important; min-height: 0 !important; }
.view-step [data-panel][hidden]:not([hidden="until-found"]) { display: none !important; }
:root.view-step .day-mark, :root.view-step .break-mark { display: none; }
:root.view-step .session { padding: 0; margin: 0; border: 0; }
:root.view-step .gate { margin: 0; }
:root.view-step .s-steps > .s-label { display: none; }
:root.view-step .step .step-kicker { display: none; }
.view-step [data-panel].is-active { animation: panel-in .32s var(--ease-out-strong) both; }
@keyframes panel-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ── Portada: lámina 1 del deck ─────────────────────────────────── */
.intro {
  position: relative; overflow: hidden; isolation: isolate;
  padding: clamp(2rem, 5vw, 3.25rem) clamp(1.25rem, 4vw, 3rem) clamp(1.75rem, 4vw, 2.75rem);
  background: var(--navy) url(brand/cover-bg.jpg) center / cover no-repeat;
  color: var(--on-navy-2);
}
.intro::before {
  content: ""; position: absolute; z-index: -1; right: -6%; top: -12%; width: 46%; height: 124%;
  background: url(brand/cover-network.png) left center / contain no-repeat;
  opacity: .9; pointer-events: none;
}
.intro-kicker { color: var(--bright); letter-spacing: .26em; font-size: .75rem; }
.intro h1 {
  margin-top: .875rem; max-width: 16ch;
  font: 800 clamp(2.125rem, 5vw, 3.5rem)/1.04 var(--font-display);
  letter-spacing: -.025em; color: #fff;
  text-wrap: balance;
}
.intro h1 em { color: var(--bright); }
.intro-lede { margin-top: 1.25rem; max-width: 62ch; font-size: 1.125rem; line-height: 1.55; color: var(--on-navy-2); }
.intro-lede strong { color: #fff; }
.intro-meta {
  display: flex; flex-wrap: wrap; gap: .25rem 0;
  margin-top: 1.25rem; font-size: .9375rem; color: var(--on-navy-3);
}
.intro-meta strong { color: #fff; }
.intro-meta > span:not(:nth-last-child(-n+2))::after { content: "·"; margin: 0 .625rem; color: var(--on-navy-3); }
.intro-meta > span:last-child { flex-basis: 100%; }
/* Cajas con borde azul de la portada (AUDIENCIA / DURACIÓN / META) */
.spec {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .625rem;
  margin-top: 1.5rem; font-size: .9375rem;
}
.spec > div {
  padding: .75rem 1rem .875rem; min-width: 0;
  border: 1.5px solid #1E78CC; background: rgb(5 40 90 / .55);
}
.spec dt { color: var(--bright); font: 700 .625rem/1.6 var(--font-display); letter-spacing: .2em; text-transform: uppercase; }
.spec dd { margin-top: .25rem; color: #fff; min-width: 0; overflow-wrap: anywhere; }
.spec dd strong { color: #fff; }
.spec dd code, .intro code { background: rgb(255 255 255 / .1); color: #fff; }
.lab-resume {
  display: inline-flex; align-items: center; gap: .5rem; margin-top: 1.5rem;
}
.lab-resume .btn { --btn-color: var(--bright); --btn-fg: var(--navy); border-color: var(--bright); }

/* Antes de empezar */
.before { padding-top: 2.5rem; }
.block-title, .s-title {
  font: 800 clamp(1.75rem, 3.4vw, 2.375rem)/1.1 var(--font-display);
  letter-spacing: -.02em; color: var(--ink);
  text-wrap: balance;
}
.paths-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1rem; margin-top: 1.5rem; }
.path-card {
  min-width: 0; padding: 1.25rem 1.25rem 1rem;
  background: var(--inset);
  border-top: 4px solid var(--line-strong);
}
.path-card.is-recommended { border-top-color: var(--brand); background: var(--tint); }
.path-kind { color: var(--ink-3); }
.path-card.is-recommended .path-kind { color: var(--brand); }
.path-title { margin-top: .375rem; font: 700 1.25rem/1.25 var(--font-display); color: var(--ink); letter-spacing: -.01em; }
.path-desc, .path-note { margin-top: .5rem; color: var(--ink-2); }
.path-note { font-size: .9375rem; }

/* Callout del deck: regla gruesa a la izquierda */
.prereq {
  margin-top: 1rem; padding: 1.25rem 1.25rem .5rem 1.5rem;
  background: var(--amber-tint);
  border-left: 6px solid var(--yellow);
}
.prereq-kind { color: var(--amber); }
.prereq-title { margin-top: .375rem; font: 700 1.25rem/1.25 var(--font-display); color: var(--ink); letter-spacing: -.01em; }
.prereq > p { margin-top: .5rem; color: var(--ink-2); }
.prereq .prereq-foot { margin: .75rem 0 .75rem; font-size: .9375rem; }

/* Mañana / Tarde y pausas (vista completa) */
.day-mark, .break-mark {
  display: flex; align-items: center; gap: .625rem;
  margin: 4rem 0 0;
  font: 700 .6875rem/1 var(--font-display); letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3);
}
.day-mark::after, .break-mark::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.break-mark .ic { width: 1rem; height: 1rem; }

/* ── Sesión: portada de sesión (láminas 5/10/15/19) ─────────────── */
.session { padding-top: 2.25rem; }
.day-mark + .session, .break-mark + .session { padding-top: 1.75rem; }
.session + .session { margin-top: 4rem; }
.s-head {
  position: relative; overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1.25rem, 4vw, 2.75rem) clamp(1.5rem, 3.5vw, 2.25rem);
  background: var(--navy) url(brand/session-bg.jpg) center / cover no-repeat;
  border-left: 10px solid var(--sess-hue);
  color: var(--on-navy-2);
}
.s-kicker { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0; color: var(--on-navy-3); font-variant-numeric: tabular-nums; }
.s-kicker > span + span::before { content: "·"; margin: 0 .625rem; }
.s-tag { color: var(--sess-glow); }
.s-time { font-family: var(--font-display); }
.s-head .s-title { margin-top: .625rem; color: #fff; font-size: clamp(2rem, 4.4vw, 3rem); line-height: 1.04; }
.s-head .t-accent { color: var(--sess-glow); }
.s-obj { margin-top: 1rem; max-width: 62ch; font-size: 1.0625rem; line-height: 1.55; color: var(--on-navy-2); }
.s-obj strong { color: #fff; }
.s-obj code { background: rgb(255 255 255 / .1); color: #fff; }
.s-flow { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; margin-top: 1.375rem; }
.s-flow-link {
  display: inline-flex; align-items: center; gap: .5rem;
  min-height: 2.5rem; padding: 0 1rem;
  border: 1.5px solid var(--sess-glow); color: #fff;
  font: 700 .875rem/1.2 var(--font-display); text-decoration: none;
  transition: background-color .15s;
}
.s-flow-link:hover { background: rgb(255 255 255 / .08); }
.s-flow-link:focus-visible { outline-color: #fff; }
.flows-hint { font-size: .875rem; color: var(--on-navy-3); }

.s-label {
  display: flex; align-items: center; gap: .75rem;
  margin: 2.25rem 0 1rem;
  font: 700 .75rem/1.3 var(--font-display); letter-spacing: .2em; text-transform: uppercase; color: var(--sess-ink);
}
.s-label::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.mat-list {
  list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: .5rem; font-size: 1rem;
}
.mat-list li {
  position: relative; min-width: 0;
  padding: .75rem .875rem .75rem 2.25rem; background: var(--inset); color: var(--ink);
  border-top: 2px solid var(--line);
}
.mat-list li::before {
  content: ""; position: absolute; left: .875rem; top: 1.15em;
  width: .5rem; height: .5rem; background: var(--sess-hue);
}
.mat-note { margin-top: .875rem; padding-left: .875rem; border-left: 3px solid var(--line-strong); font-size: .9375rem; color: var(--ink-2); }

/* ── Paso: la tarea en foco ──────────────────────────────────────── */
.step {
  position: relative;
  display: grid; grid-template-columns: 4.25rem minmax(0, 1fr);
  padding: 2rem 0 1.75rem;
  border-top: 1px solid var(--line);
}
:root.view-step .step { padding-top: .5rem; border-top: 0; }
.step-num {
  font: 800 2.25rem/1 var(--font-display); letter-spacing: -.04em; color: var(--sess-hue);
  font-variant-numeric: tabular-nums;
}
.step-kicker { display: block; margin-bottom: .5rem; color: var(--sess-ink); }
.step-title { font: 700 clamp(1.25rem, 2.4vw, 1.625rem)/1.25 var(--font-display); letter-spacing: -.015em; color: var(--ink); text-wrap: pretty; }
.step-title code { font-size: .78em; }
.step-desc { margin-top: .75rem; color: var(--ink-2); max-width: 70ch; }
.step-desc + .step-desc { margin-top: .75rem; }
.step-desc strong, .step-tip strong { color: var(--ink); }
.step-tip {
  margin-top: 1rem; padding: .75rem 1rem .75rem 1.125rem;
  background: var(--amber-tint); border-left: 6px solid var(--yellow);
  color: var(--ink); font-size: 1rem;
}

/* Barra de acciones del panel: hecho + anterior / siguiente */
.lab-actions {
  grid-column: 1 / -1;
  display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1rem;
  margin-top: 1.75rem; padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.lab-done {
  display: inline-flex; align-items: center; gap: .625rem; cursor: pointer;
  min-height: 2.5rem; padding: 0 .875rem 0 .75rem;
  border: 1.5px solid var(--line-strong); background: var(--surface);
  font: 700 .8125rem/1.2 var(--font-display); color: var(--ink);
  transition: border-color .15s, background-color .15s;
}
.lab-done:hover { border-color: var(--ink-3); }
.lab-done .checkbox { --input-color: var(--line-strong); color: var(--green-hue); }
.lab-done:has(:checked) { border-color: var(--green-hue); background: var(--green-tint); color: var(--green); }
.lab-done:has(:focus-visible) { outline: 2px solid var(--bright); outline-offset: 2px; }
.lab-pager { margin-left: auto; display: flex; flex-wrap: wrap; gap: .5rem; }
.lab-pager .btn { min-height: 2.5rem; height: auto; padding-block: .5rem; text-align: left; }
.lab-pager .btn-primary { max-width: 24rem; }
.lab-pager .btn-primary span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.lab-pager .btn-ghost { color: var(--ink-2); border-color: var(--line-strong); }

/* ── Checkpoint: Qué obtengo ─────────────────────────────────────── */
.s-out { padding-top: 2.5rem; }
:root.view-step .s-out { padding-top: 0; }
.s-out > .s-label {
  margin-top: 0; font-size: clamp(1.625rem, 3.2vw, 2.125rem); letter-spacing: -.02em; text-transform: none;
  font-weight: 800; color: var(--ink);
}
.out-columns { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1.25rem; }
.out-col { min-width: 0; display: flex; flex-direction: column; }
.out-col-label {
  display: flex; align-items: center; gap: .5rem;
  padding: .5rem .875rem; background: var(--code-head); color: var(--on-navy-2);
  font: 700 .75rem/1.3 var(--font-display); letter-spacing: .02em;
  border-left: 4px solid var(--sess-glow);
}
.out-col-label .ic { width: 1rem; height: 1rem; color: var(--on-navy-3); }
.out-log, .out-tree {
  max-height: 26rem; overflow: auto;
  padding: .875rem 1rem;
  background: var(--code-bg); border: 1px solid var(--code-line); border-top: 0;
  font-size: .75rem; line-height: 1.65; color: var(--code-ink);
  scrollbar-width: thin; scrollbar-color: var(--navy-3) transparent;
}
.out-key { margin: 2rem 0 .5rem; font: 700 1.125rem/1.3 var(--font-display); color: var(--ink); }
.out-list { list-style: none; counter-reset: out; }
.out-list li {
  position: relative; padding: .75rem 0 .75rem 2.5rem;
  border-bottom: 1px solid var(--line); color: var(--ink-2);
}
.out-list li::before {
  counter-increment: out; content: counter(out, decimal-leading-zero);
  position: absolute; left: 0; top: .8rem;
  font: 800 .875rem/1.4 var(--font-display); color: var(--sess-ink);
}
.out-list li:last-child { border-bottom: 0; }

/* ── Gate G2: tarjeta navy con borde amarillo (lámina 22) ────────── */
.gate {
  margin-top: 5rem;
  padding: clamp(1.5rem, 4vw, 2.5rem) clamp(1.25rem, 4vw, 2.5rem);
  background: var(--navy); border: 2px solid var(--yellow); color: var(--on-navy-2);
}
.gate .s-kicker .s-tag {
  display: inline-block; padding: .25rem .625rem; background: var(--yellow); color: var(--navy);
}
.gate .s-title { margin-top: .875rem; color: #fff; }
.gate .t-accent { color: var(--yellow); }
.gate-desc { margin-top: 1rem; max-width: 66ch; color: var(--on-navy-2); }
.rubric { width: 100%; margin-top: 1.5rem; border-collapse: collapse; font-size: 1rem; }
.rubric th {
  padding: .625rem .875rem; text-align: left;
  font: 700 .6875rem/1.3 var(--font-display); letter-spacing: .18em; text-transform: uppercase; color: var(--navy);
  background: var(--yellow);
}
.rubric td { padding: .75rem .875rem; border-bottom: 1px solid rgb(255 255 255 / .12); vertical-align: baseline; color: #fff; }
.rubric td code { background: rgb(255 255 255 / .1); color: #fff; }
.rubric .num { text-align: right; font: 800 1rem/1.3 var(--font-display); font-variant-numeric: tabular-nums; white-space: nowrap; padding-left: 1rem; }
.rubric td.num { color: var(--yellow); }
.gate-thr { margin-top: 1.25rem; font-size: 1rem; color: var(--on-navy-2); }
.gate-thr strong { color: var(--yellow); }

/* Pie */
.site-footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 1.5rem;
  padding: 1.25rem clamp(1rem, 3vw, 2rem);
  background: var(--navy); color: var(--on-navy-3);
  font-size: .875rem;
}
.site-footer a { color: var(--on-navy-2); }

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 1023.98px) {
  html { scroll-padding-top: calc(var(--mast-h) + var(--bar-h) + 3.75rem); }
  .guide-shell { display: block; padding: 0; }
  .content { padding: 1.25rem clamp(1rem, 4vw, 2rem) 3rem; max-width: 52rem; margin: 0 auto; }
  .lab-crumb { display: none; }
  .lab-view { margin-left: 0; }

  .rail {
    position: sticky; top: calc(var(--mast-h) + var(--bar-h)); z-index: 30;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
  }
  .rail-toggle {
    display: flex; align-items: center; gap: .625rem; width: 100%;
    min-height: 3rem; padding: 0 clamp(1rem, 4vw, 2rem);
    border: 0; background: transparent; color: var(--ink);
    font: 700 .875rem/1.3 var(--font-display); text-align: left; cursor: pointer;
  }
  .rail-where { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .rail-meter { flex: none; font: 500 .75rem/1 var(--font-mono); color: var(--ink-3); }
  .rail-caret { transition: transform .2s var(--ease-out-strong); }
  .rail-toggle[aria-expanded="true"] .rail-caret { transform: rotate(180deg); }
  .rail-panel {
    position: absolute; top: 100%; left: 0; right: 0;
    margin: 0; padding: .75rem clamp(.75rem, 3vw, 1.5rem) 1rem;
    max-height: min(75vh, 40rem);
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 36px -14px rgb(7 14 37 / .35);
  }
  .js .rail-panel:not(.is-open) { display: none; }
  /* Acciones al alcance del pulgar */
  .view-step .lab-actions {
    position: sticky; bottom: 0; z-index: 20;
    margin-inline: calc(-1 * clamp(1rem, 4vw, 2rem)); padding: .625rem clamp(1rem, 4vw, 2rem);
    background: color-mix(in srgb, var(--surface) 94%, transparent);
    backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  }
}
@media (max-width: 960px) {
  .mast-org { display: none; }
}
@media (max-width: 640px) {
  .mast { gap: .75rem; }
  .mast-long { display: none; }
  .mast-name { font-size: .8125rem; padding-left: .625rem; }
  .mast-logo { height: 1.125rem; }
  .mast-brand { gap: .625rem; }
  .mast-link { padding: 0 .5rem; }
  .mast-link[aria-current="page"]::after { left: .5rem; right: .5rem; }
  .step { grid-template-columns: minmax(0, 1fr); }
  .step-num { font-size: 1.75rem; margin-bottom: .375rem; }
  .spec { grid-template-columns: minmax(0, 1fr); }
  .intro::before { opacity: .35; width: 80%; right: -30%; }
  .lab-actions { gap: .5rem; }
  .lab-done { flex: 1 1 100%; justify-content: center; }
  .lab-pager { margin-left: 0; width: 100%; flex-wrap: nowrap; }
  .lab-pager .btn { flex: 1 1 0; min-width: 0; justify-content: center; }
  .lab-pager .btn-primary { max-width: none; }
  .lab-pager .pager-detail { display: none; }
  .s-head { border-left-width: 6px; }
}
@media (max-width: 420px) {
  .mast-name { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

@media print {
  .mast, .rail, .copy-btn, .skip-link, .live-toast, .lab-bar, .lab-actions { display: none !important; }
  .guide-shell { display: block; }
  [data-panel][hidden] { display: block !important; content-visibility: visible !important; }
  .out-log, .out-tree { max-height: none; }
  .code pre { white-space: pre-wrap; }
}

/* Mientras arranca el modo laboratorio no se pinta la guía completa */
.lab-booting.view-step .content { visibility: hidden; }

/* Acciones sobre la tarjeta navy del Gate */
.rubric th.num { font: 700 .6875rem/1.3 var(--font-display); letter-spacing: .18em; }
.gate .lab-actions { border-top-color: rgb(255 255 255 / .14); }
.gate .lab-pager .btn-ghost { color: #fff; border-color: rgb(255 255 255 / .3); }
.gate .lab-pager .btn-ghost:hover { background: rgb(255 255 255 / .08); }