/* ============================================================================
 * VERBUM MANET ACADEMY · styles.css
 * Sistema de diseño editorial-clásico contemporáneo
 *
 * Arquitectura:
 *   1. Tokens de diseño · paleta OKLCH, escala tipográfica fluida, espaciado
 *   2. Aplicación de tema · claro / oscuro / auto
 *   3. Reset y base · normalización, tipografía raíz, elementos globales
 *   4. Primitivas de layout · container, stack, cluster
 *   5. Componentes · skip-link, header, nav, footer, skeleton, buttons, cards
 *   6. Utilidades · visually-hidden, focus, helpers
 *   7. Animaciones · skeleton shimmer, page transitions
 *   8. Media queries · reduced-motion, print
 * ========================================================================= */


/* ============================================================================
 *  1. TOKENS DE DISEÑO
 * ========================================================================= */

:root {
  /* ------------------------------------------------------------------------
   *  Paleta VMA · valores OKLCH verificados para WCAG AA
   * --------------------------------------------------------------------- */

  /* Pergamino cálido · superficie principal en modo claro */
  --vma-cream:          oklch(97% 0.016 82);
  --vma-cream-soft:     oklch(94% 0.020 82);
  --vma-cream-deep:     oklch(90% 0.024 80);

  /* Tinta · texto y autoridad */
  --vma-ink:            oklch(20% 0.020 275);
  --vma-ink-soft:       oklch(36% 0.022 275);
  --vma-ink-faint:      oklch(52% 0.018 275);

  /* Navy · azul-noche de autoridad académica */
  --vma-navy:           oklch(22% 0.042 265);
  --vma-navy-deep:      oklch(13% 0.030 265);
  --vma-navy-darker:    oklch(9%  0.022 265);

  /* Dorado antiguo · excelencia y permanencia */
  --vma-gold:           oklch(60% 0.130 75);   /* oscuro para texto sobre cream */
  --vma-gold-bright:    oklch(72% 0.138 80);   /* brillante sobre navy */
  --vma-gold-soft:      oklch(84% 0.080 85);   /* decorativo suave */

  /* Niebla · hairlines y separadores */
  --vma-mist:           oklch(86% 0.008 85);
  --vma-mist-soft:      oklch(92% 0.006 85);
  --vma-mist-dark:      oklch(28% 0.012 265);
  --vma-mist-darker:    oklch(20% 0.018 265);

  /* Tintes funcionales */
  --vma-success:        oklch(60% 0.12 150);
  --vma-warning:        oklch(72% 0.14 65);
  --vma-danger:         oklch(55% 0.17 25);

  /* ------------------------------------------------------------------------
   *  Escala tipográfica fluida · clamp(min, preferred, max)
   *  Referencia: 16px base → 17px base (16–19 fluido)
   * --------------------------------------------------------------------- */
  --text-xs:     clamp(0.75rem,  0.72rem + 0.15vw, 0.8125rem);   /* 12–13 */
  --text-sm:     clamp(0.875rem, 0.84rem + 0.18vw, 0.9375rem);   /* 14–15 */
  --text-base:   clamp(1rem,     0.95rem + 0.25vw, 1.125rem);    /* 16–18 */
  --text-lead:   clamp(1.125rem, 1.05rem + 0.38vw, 1.3125rem);   /* 18–21 */
  --text-h4:     clamp(1.125rem, 1.04rem + 0.42vw, 1.375rem);    /* 18–22 */
  --text-h3:     clamp(1.25rem,  1.12rem + 0.65vw, 1.625rem);    /* 20–26 */
  --text-h2:     clamp(1.625rem, 1.4rem  + 1.15vw, 2.25rem);     /* 26–36 */
  --text-h1:     clamp(2rem,     1.65rem + 1.85vw, 3rem);        /* 32–48 */
  --text-display: clamp(2.5rem,  1.9rem  + 3.2vw,  4.5rem);      /* 40–72 */

  /* Altura de línea */
  --leading-tight:  1.15;
  --leading-snug:   1.3;
  --leading-normal: 1.55;
  --leading-loose:  1.75;

  /* Interletrado · para capitales romanas en titulares */
  --tracking-tight:  -0.015em;
  --tracking-normal:  0;
  --tracking-wide:    0.045em;
  --tracking-wider:   0.09em;
  --tracking-widest:  0.14em;

  /* Familias tipográficas */
  --font-display: 'Gambarino', 'Iowan Old Style', 'Palatino Linotype', Georgia, serif;
  --font-body:    'Gambetta', 'Iowan Old Style', 'Palatino Linotype', Georgia, serif;
  --font-mono:    ui-monospace, 'SFMono-Regular', 'Menlo', 'Consolas', monospace;

  /* ------------------------------------------------------------------------
   *  Escala de espaciado · fluida donde amerita
   * --------------------------------------------------------------------- */
  --space-3xs:   0.25rem;                                      /* 4  */
  --space-2xs:   0.5rem;                                       /* 8  */
  --space-xs:    0.75rem;                                      /* 12 */
  --space-sm:    1rem;                                         /* 16 */
  --space-md:    1.5rem;                                       /* 24 */
  --space-lg:    clamp(2rem,   1.5rem + 2vw,    3rem);         /* 32–48 */
  --space-xl:    clamp(3rem,   2rem   + 4vw,    5rem);         /* 48–80 */
  --space-2xl:   clamp(4rem,   2.5rem + 6vw,    8rem);         /* 64–128 */
  --space-3xl:   clamp(6rem,   4rem   + 8vw,   11rem);         /* 96–176 */

  /* ------------------------------------------------------------------------
   *  Layout
   * --------------------------------------------------------------------- */
  --container-narrow: 42rem;   /* 672  · prosa larga */
  --container-prose:  56rem;   /* 896  · artículo con asides */
  --container-wide:   72rem;   /* 1152 · catálogos y dashboards */
  --container-full:   90rem;   /* 1440 · layouts editoriales amplios */

  --header-height:    clamp(3.75rem, 3.5rem + 1vw, 4.5rem);
  --content-padding:  clamp(1.25rem, 0.9rem + 1.4vw, 2rem);

  /* ------------------------------------------------------------------------
   *  Bordes y radios · radios modestos, coherentes con estética inscripcional
   * --------------------------------------------------------------------- */
  --radius-xs:  2px;
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-full: 9999px;

  --border-width: 1px;

  /* ------------------------------------------------------------------------
   *  Sombras · tintes cálidos (no negros sobre cream)
   * --------------------------------------------------------------------- */
  --shadow-xs:
    0 1px 2px oklch(22% 0.03 265 / 0.06);
  --shadow-sm:
    0 1px 2px oklch(22% 0.03 265 / 0.05),
    0 2px 4px oklch(22% 0.03 265 / 0.04);
  --shadow-md:
    0 2px 4px oklch(22% 0.03 265 / 0.05),
    0 6px 14px oklch(22% 0.03 265 / 0.06);
  --shadow-lg:
    0 4px 8px oklch(22% 0.03 265 / 0.06),
    0 12px 28px oklch(22% 0.03 265 / 0.08);

  /* ------------------------------------------------------------------------
   *  Capas (z-index)
   * --------------------------------------------------------------------- */
  --z-base:      1;
  --z-header:    50;
  --z-backdrop:  80;
  --z-drawer:    90;
  --z-modal:     100;
  --z-toast:     110;

  /* ------------------------------------------------------------------------
   *  Transiciones
   * --------------------------------------------------------------------- */
  --ease-out:    cubic-bezier(0.2, 0.7, 0.2, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast:   150ms;
  --duration-base:   240ms;
  --duration-slow:   400ms;

  /* ------------------------------------------------------------------------
   *  TOKENS SEMÁNTICOS · mapeo por tema
   *  Por defecto cargamos los de modo CLARO
   * --------------------------------------------------------------------- */
  --bg-base:       var(--vma-cream);
  --bg-surface:    var(--vma-cream-soft);
  --bg-raised:     var(--vma-cream);
  --bg-inverse:    var(--vma-navy-deep);
  --bg-muted:      var(--vma-cream-deep);

  --text-primary:    var(--vma-ink);
  --text-secondary:  var(--vma-ink-soft);
  --text-faint:      var(--vma-ink-faint);
  --text-heading:    var(--vma-navy);
  --text-inverse:    var(--vma-cream);
  --text-accent:     var(--vma-gold);

  --accent:          var(--vma-gold);
  --accent-hover:    var(--vma-gold-bright);
  --accent-subtle:   var(--vma-gold-soft);

  --border:          var(--vma-mist);
  --border-strong:   var(--vma-mist-dark);
  --border-subtle:   var(--vma-mist-soft);

  --focus-ring:      var(--vma-gold);
  --selection-bg:    var(--vma-gold-soft);
  --selection-text:  var(--vma-navy);
}


/* ============================================================================
 *  2. APLICACIÓN DE TEMA · claro · oscuro · auto
 * ========================================================================= */

/* Modo OSCURO por atributo explícito */
[data-theme="dark"] {
  --bg-base:       var(--vma-navy-deep);
  --bg-surface:    var(--vma-navy);
  --bg-raised:     oklch(17% 0.028 265);
  --bg-inverse:    var(--vma-cream);
  --bg-muted:      oklch(15% 0.025 265);

  --text-primary:    var(--vma-cream);
  --text-secondary:  oklch(82% 0.012 85);
  --text-faint:      oklch(68% 0.010 85);
  --text-heading:    var(--vma-cream);
  --text-inverse:    var(--vma-navy);
  --text-accent:     var(--vma-gold-bright);

  --accent:          var(--vma-gold-bright);
  --accent-hover:    oklch(80% 0.130 82);
  --accent-subtle:   oklch(38% 0.070 75);

  --border:          var(--vma-mist-dark);
  --border-strong:   oklch(38% 0.015 265);
  --border-subtle:   var(--vma-mist-darker);

  --focus-ring:      var(--vma-gold-bright);
  --selection-bg:    var(--vma-gold);
  --selection-text:  var(--vma-navy-darker);

  /* Sombras recalibradas para superficies oscuras */
  --shadow-xs: 0 1px 2px oklch(0% 0 0 / 0.35);
  --shadow-sm: 0 1px 2px oklch(0% 0 0 / 0.30), 0 2px 4px oklch(0% 0 0 / 0.25);
  --shadow-md: 0 2px 4px oklch(0% 0 0 / 0.30), 0 6px 14px oklch(0% 0 0 / 0.35);
  --shadow-lg: 0 4px 8px oklch(0% 0 0 / 0.35), 0 12px 28px oklch(0% 0 0 / 0.45);
}

/* Modo AUTO · respeta preferencia del sistema cuando data-theme="auto" */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --bg-base:       var(--vma-navy-deep);
    --bg-surface:    var(--vma-navy);
    --bg-raised:     oklch(17% 0.028 265);
    --bg-inverse:    var(--vma-cream);
    --bg-muted:      oklch(15% 0.025 265);

    --text-primary:    var(--vma-cream);
    --text-secondary:  oklch(82% 0.012 85);
    --text-faint:      oklch(68% 0.010 85);
    --text-heading:    var(--vma-cream);
    --text-inverse:    var(--vma-navy);
    --text-accent:     var(--vma-gold-bright);

    --accent:          var(--vma-gold-bright);
    --accent-hover:    oklch(80% 0.130 82);
    --accent-subtle:   oklch(38% 0.070 75);

    --border:          var(--vma-mist-dark);
    --border-strong:   oklch(38% 0.015 265);
    --border-subtle:   var(--vma-mist-darker);

    --focus-ring:      var(--vma-gold-bright);
    --selection-bg:    var(--vma-gold);
    --selection-text:  var(--vma-navy-darker);

    --shadow-xs: 0 1px 2px oklch(0% 0 0 / 0.35);
    --shadow-sm: 0 1px 2px oklch(0% 0 0 / 0.30), 0 2px 4px oklch(0% 0 0 / 0.25);
    --shadow-md: 0 2px 4px oklch(0% 0 0 / 0.30), 0 6px 14px oklch(0% 0 0 / 0.35);
    --shadow-lg: 0 4px 8px oklch(0% 0 0 / 0.35), 0 12px 28px oklch(0% 0 0 / 0.45);
  }
}


/* ============================================================================
 *  3. RESET Y BASE
 * ========================================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  tab-size: 4;
  hanging-punctuation: first last;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
  color-scheme: light dark;
}

body {
  min-height: 100vh;
  min-height: 100svh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition:
    background-color var(--duration-base) var(--ease-out),
    color var(--duration-base) var(--ease-out);
}

/* Grano sutil sobre pergamino · prácticamente imperceptible en cream.
   Mantiene la calidez tipográfica sin pesar en el render */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  opacity: 0.35;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.12 0 0 0 0 0.10 0 0 0 0 0.08 0 0 0 0.22 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

[data-theme="dark"] body::before,
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] body::before {
    opacity: 0.22;
    mix-blend-mode: screen;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.95 0 0 0 0 0.90 0 0 0 0 0.80 0 0 0 0.10 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  }
}

/* Tipografía de encabezados */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: var(--leading-tight);
  color: var(--text-heading);
  text-wrap: balance;
}

h1 { font-size: var(--text-h1); letter-spacing: var(--tracking-tight); }
h2 { font-size: var(--text-h2); letter-spacing: var(--tracking-tight); }
h3 { font-size: var(--text-h3); letter-spacing: var(--tracking-normal); }
h4 { font-size: var(--text-h4); letter-spacing: var(--tracking-normal); }
h5 { font-size: var(--text-base); letter-spacing: var(--tracking-wide); font-family: var(--font-body); font-weight: 500; text-transform: uppercase; }
h6 { font-size: var(--text-sm);  letter-spacing: var(--tracking-wider); font-family: var(--font-body); font-weight: 500; text-transform: uppercase; color: var(--text-secondary); }

/* Párrafos y cuerpo */
p {
  line-height: var(--leading-normal);
  text-wrap: pretty;
  max-width: var(--container-narrow);
}

strong, b { font-weight: 700; }
em, i    { font-style: italic; }

small { font-size: var(--text-sm); color: var(--text-secondary); }

/* Enlaces · subrayado tipográfico refinado */
a {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition:
    text-decoration-thickness var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

a:hover {
  text-decoration-thickness: 2px;
  color: var(--text-accent);
}

a:visited {
  color: var(--text-primary);
}

/* Listas */
ul, ol {
  padding-left: 1.25rem;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
  padding-left: 0;
}

/* Citas */
blockquote {
  border-left: 2px solid var(--accent);
  padding-left: var(--space-md);
  font-style: italic;
  color: var(--text-secondary);
}

/* Código */
code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

code {
  padding: 0.1em 0.35em;
  background-color: var(--bg-muted);
  border-radius: var(--radius-xs);
}

pre {
  padding: var(--space-md);
  background-color: var(--bg-muted);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

/* Multimedia */
img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

img, picture {
  font-style: italic;
  background-repeat: no-repeat;
  background-size: cover;
  shape-margin: 0.75rem;
}

/* Formularios */
input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

/* Tablas */
table {
  border-collapse: collapse;
  width: 100%;
  font-variant-numeric: tabular-nums;
}

th, td {
  padding: var(--space-xs) var(--space-sm);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 500;
  color: var(--text-heading);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  font-size: var(--text-xs);
}

/* Regla horizontal · hairline delicado */
hr {
  border: none;
  height: 1px;
  background-color: var(--border);
  margin-block: var(--space-lg);
}

/* Selección · inversión cálida */
::selection {
  background-color: var(--selection-bg);
  color: var(--selection-text);
}

/* Scrollbar discreta */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background-color: var(--border-strong);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-base);
}
*::-webkit-scrollbar-thumb:hover { background-color: var(--accent); }

/* Focus-visible global · anillo dorado */
:focus:not(:focus-visible) { outline: none; }

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}


/* ============================================================================
 *  4. PRIMITIVAS DE LAYOUT
 * ========================================================================= */

.container {
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--content-padding);
}

.container--narrow { max-width: var(--container-narrow); }
.container--prose  { max-width: var(--container-prose);  }
.container--full   { max-width: var(--container-full);   }

/* Utilidad de flujo vertical */
.stack > * + * {
  margin-block-start: var(--stack-gap, var(--space-md));
}

.stack--sm { --stack-gap: var(--space-sm); }
.stack--lg { --stack-gap: var(--space-lg); }
.stack--xl { --stack-gap: var(--space-xl); }


/* ============================================================================
 *  5. COMPONENTES
 * ========================================================================= */

/* ----------------------------------------------------------------------------
 *  5.1  Skip-link · primer elemento enfocable, oculto hasta el tab
 * ------------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  inset-inline-start: var(--space-sm);
  inset-block-start: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background-color: var(--bg-inverse);
  color: var(--text-inverse);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  border-radius: var(--radius-sm);
  transform: translateY(-150%);
  transition: transform var(--duration-base) var(--ease-out);
  z-index: var(--z-toast);
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}


/* ----------------------------------------------------------------------------
 *  5.2  Cabecera del sitio
 * ------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--bg-base);
  border-block-end: 1px solid var(--border);
  backdrop-filter: saturate(1.1) blur(8px);
  -webkit-backdrop-filter: saturate(1.1) blur(8px);
  transition:
    background-color var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out);
}

.site-header__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-md);
  min-height: var(--header-height);
}

/* Marca · logotipo + wordmark */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.brand:hover { color: var(--text-accent); }

.brand__mark {
  width: clamp(2rem, 1.5rem + 1.5vw, 2.5rem);
  height: clamp(2rem, 1.5rem + 1.5vw, 2.5rem);
  flex-shrink: 0;
  transition: transform var(--duration-slow) var(--ease-out);
}

.brand:hover .brand__mark {
  transform: rotate(-2deg) scale(1.02);
}

.brand__wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1;
  letter-spacing: var(--tracking-tight);
}

.brand__name {
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 0.95rem + 0.4vw, 1.25rem);
  font-weight: 400;
  letter-spacing: var(--tracking-tight);
}

.brand__sub {
  margin-block-start: 0.15em;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--text-secondary);
}


/* ----------------------------------------------------------------------------
 *  5.3  Navegación principal
 * ------------------------------------------------------------------------- */

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 0.2rem + 1.2vw, 1.5rem);
  justify-content: center;
}

.site-nav__list a {
  position: relative;
  display: inline-block;
  padding: 0.6rem 0.25rem;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0.25rem;
  right: 0.25rem;
  bottom: 0.3rem;
  height: 1px;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--duration-base) var(--ease-out);
}

.site-nav__list a:hover,
.site-nav__list a[aria-current="page"],
.site-nav__list a.is-active {
  color: var(--text-primary);
}

.site-nav__list a:hover::after,
.site-nav__list a[aria-current="page"]::after,
.site-nav__list a.is-active::after {
  transform: scaleX(1);
}


/* ----------------------------------------------------------------------------
 *  5.4  Acciones de cabecera · iconos de tema y menú
 * ------------------------------------------------------------------------- */

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
}

.icon-button {
  --_size: 2.5rem;
  display: inline-grid;
  place-items: center;
  width: var(--_size);
  height: var(--_size);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  background-color: transparent;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.icon-button:hover {
  background-color: var(--bg-muted);
  color: var(--text-accent);
}

.icon-button .icon {
  width: 1.25rem;
  height: 1.25rem;
}

/* Toggle de tema · intercambio sol/luna por estado del root */
.icon--sun,
.icon--moon {
  grid-area: 1 / 1;
  transition:
    opacity var(--duration-base) var(--ease-out),
    transform var(--duration-base) var(--ease-out);
}

[data-theme="light"] .icon--sun,
[data-theme="auto"] .icon--sun {
  opacity: 1;
  transform: rotate(0) scale(1);
}
[data-theme="light"] .icon--moon,
[data-theme="auto"] .icon--moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
  pointer-events: none;
}

[data-theme="dark"] .icon--sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
  pointer-events: none;
}
[data-theme="dark"] .icon--moon {
  opacity: 1;
  transform: rotate(0) scale(1);
}

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .icon--sun {
    opacity: 0;
    transform: rotate(90deg) scale(0.6);
    pointer-events: none;
  }
  [data-theme="auto"] .icon--moon {
    opacity: 1;
    transform: rotate(0) scale(1);
  }
}

.theme-toggle {
  position: relative;
  display: inline-grid;
}

/* Toggle de navegación · intercambio hamburguesa/cerrar */
.nav-toggle {
  display: none;
  position: relative;
}

.icon--menu,
.icon--close {
  grid-area: 1 / 1;
  transition:
    opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.icon--close {
  opacity: 0;
  transform: rotate(-45deg) scale(0.8);
  pointer-events: none;
}

.nav-toggle[aria-expanded="true"] .icon--menu {
  opacity: 0;
  transform: rotate(45deg) scale(0.8);
  pointer-events: none;
}
.nav-toggle[aria-expanded="true"] .icon--close {
  opacity: 1;
  transform: rotate(0) scale(1);
  pointer-events: auto;
}


/* ----------------------------------------------------------------------------
 *  5.5  Cajón de navegación móvil · backdrop + drawer
 * ------------------------------------------------------------------------- */

.nav-backdrop {
  position: fixed;
  inset: 0;
  background-color: oklch(10% 0.015 265 / 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out);
  z-index: var(--z-backdrop);
}

.nav-backdrop.is-active {
  opacity: 1;
  pointer-events: auto;
}

@media (max-width: 820px) {
  .nav-toggle { display: inline-grid; }

  .site-nav {
    position: fixed;
    inset-block-start: var(--header-height);
    inset-inline-end: 0;
    width: min(22rem, 100%);
    height: calc(100dvh - var(--header-height));
    padding: var(--space-lg) var(--content-padding);
    background-color: var(--bg-base);
    border-inline-start: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-out);
    z-index: var(--z-drawer);
    overflow-y: auto;
  }

  .site-nav.is-open { transform: translateX(0); }

  .site-nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2xs);
  }

  .site-nav__list a {
    display: block;
    width: 100%;
    padding: 0.9rem 0.25rem;
    border-block-end: 1px solid var(--border-subtle);
    font-size: var(--text-base);
    letter-spacing: var(--tracking-normal);
    text-transform: none;
  }

  .site-nav__list a::after { display: none; }

  .site-nav__list a:hover,
  .site-nav__list a[aria-current="page"],
  .site-nav__list a.is-active {
    color: var(--text-accent);
  }
}


/* ----------------------------------------------------------------------------
 *  5.6  Contenido principal · área de renderizado SPA
 * ------------------------------------------------------------------------- */

.site-main {
  display: block;
  min-height: calc(100vh - var(--header-height) - 20rem);
  min-height: calc(100svh - var(--header-height) - 20rem);
  padding-block: var(--space-xl) var(--space-2xl);
}

.site-main:focus { outline: none; }


/* ----------------------------------------------------------------------------
 *  5.7  Skeleton loader · placeholder animado durante fetch de fragmentos
 * ------------------------------------------------------------------------- */

.skeleton-wrap {
  max-width: var(--container-prose);
  margin-inline: auto;
  padding-inline: var(--content-padding);
  padding-block-start: var(--space-lg);
}

.skeleton {
  --_base: var(--bg-muted);
  --_shine: color-mix(in oklch, var(--bg-muted) 60%, var(--bg-surface));
  height: 1rem;
  border-radius: var(--radius-xs);
  background:
    linear-gradient(
      90deg,
      var(--_base) 0%,
      var(--_shine) 50%,
      var(--_base) 100%
    );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.6s linear infinite;
}

.skeleton + .skeleton { margin-block-start: var(--space-sm); }

.skeleton--heading {
  height: 2.25rem;
  width: 62%;
  margin-block-end: var(--space-md);
}

.skeleton--text {
  height: 1rem;
  width: 100%;
}

.skeleton--block {
  height: 8rem;
  width: 100%;
  border-radius: var(--radius-md);
}


/* ----------------------------------------------------------------------------
 *  5.8  Estado de error · fallback si courseLoader falla
 * ------------------------------------------------------------------------- */

.error-state {
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding: var(--space-xl) var(--content-padding);
}

.error-state__title {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  color: var(--text-heading);
  margin-block-end: var(--space-sm);
}

.error-state__body {
  color: var(--text-secondary);
  margin-block-end: var(--space-lg);
}


/* ----------------------------------------------------------------------------
 *  5.9  Aviso NOSCRIPT
 * ------------------------------------------------------------------------- */

.noscript-notice {
  max-width: var(--container-narrow);
  margin: var(--space-xl) auto;
  padding: var(--space-lg);
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
}

.noscript-notice__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  color: var(--text-heading);
  margin-block-end: var(--space-sm);
}

.noscript-notice__body {
  color: var(--text-secondary);
  line-height: var(--leading-loose);
}


/* ----------------------------------------------------------------------------
 *  5.10  Pie de página
 * ------------------------------------------------------------------------- */

.site-footer {
  margin-block-start: var(--space-2xl);
  padding-block: var(--space-xl);
  background-color: var(--bg-muted);
  border-block-start: 1px solid var(--border);
  color: var(--text-secondary);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .site-footer__inner {
    grid-template-columns: 1.3fr 2fr;
    align-items: start;
  }
}

.site-footer__motto {
  border-inline-start: 2px solid var(--accent);
  padding-inline-start: var(--space-md);
}

.site-footer__latin {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-style: italic;
  color: var(--text-heading);
  line-height: var(--leading-tight);
  max-width: none;
}

.site-footer__spanish {
  margin-block-start: var(--space-2xs);
  font-size: var(--text-base);
  color: var(--text-secondary);
  max-width: none;
}

.site-footer__cite {
  display: block;
  margin-block-start: var(--space-sm);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--text-faint);
  font-style: normal;
}

.site-footer__links {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
}

.site-footer__heading {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--text-primary);
  margin-block-end: var(--space-sm);
  max-width: none;
}

.site-footer__col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.site-footer__col a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out);
}

.site-footer__col a:hover {
  color: var(--text-accent);
}

.site-footer__colofon {
  grid-column: 1 / -1;
  padding-block-start: var(--space-lg);
  border-block-start: 1px solid var(--border-subtle);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--text-faint);
}

.site-footer__credit { margin-block-end: var(--space-2xs); max-width: none; }
.site-footer__credit strong { color: var(--text-primary); font-weight: 500; }
.site-footer__meta { max-width: none; }


/* ----------------------------------------------------------------------------
 *  5.11  Botones · sin gradientes, superficies sólidas
 * ------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.65rem 1.25rem;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background-color: var(--vma-navy);
  color: var(--vma-cream);
  border-color: var(--vma-navy);
}

.btn--primary:hover {
  background-color: var(--vma-navy-deep);
  border-color: var(--vma-navy-deep);
  color: var(--vma-cream);
}

[data-theme="dark"] .btn--primary,
@media (prefers-color-scheme: dark) { [data-theme="auto"] .btn--primary {
  background-color: var(--vma-cream);
  color: var(--vma-navy-deep);
  border-color: var(--vma-cream);
}}

[data-theme="dark"] .btn--primary:hover,
@media (prefers-color-scheme: dark) { [data-theme="auto"] .btn--primary:hover {
  background-color: var(--vma-gold-bright);
  border-color: var(--vma-gold-bright);
  color: var(--vma-navy-darker);
}}

.btn--secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn--secondary:hover {
  border-color: var(--accent);
  color: var(--text-accent);
  background-color: var(--bg-surface);
}

.btn--ghost {
  background-color: transparent;
  color: var(--text-primary);
  border-color: transparent;
}

.btn--ghost:hover {
  background-color: var(--bg-muted);
  color: var(--text-accent);
}


/* ----------------------------------------------------------------------------
 *  5.12  Cards · sin left-border de color, separación por superficie
 * ------------------------------------------------------------------------- */

.card {
  display: block;
  padding: var(--space-md);
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: inherit;
  text-decoration: none;
  transition:
    border-color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out),
    transform var(--duration-base) var(--ease-out);
}

a.card:hover,
.card--interactive:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.card__eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--text-accent);
  margin-block-end: var(--space-2xs);
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  color: var(--text-heading);
  margin-block-end: var(--space-sm);
  line-height: var(--leading-tight);
}

.card__body {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  max-width: none;
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-block-start: var(--space-md);
  padding-block-start: var(--space-sm);
  border-block-start: 1px solid var(--border-subtle);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--text-faint);
  text-transform: uppercase;
}


/* ----------------------------------------------------------------------------
 *  5.13  Tags / chips · metadatos de cursos
 * ------------------------------------------------------------------------- */

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.6rem;
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  color: var(--text-secondary);
  background-color: var(--bg-muted);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
}

.tag--level {
  color: var(--text-accent);
  border-color: var(--accent-subtle);
  background-color: transparent;
}


/* ----------------------------------------------------------------------------
 *  5.14  Tooltip de glosario · término hoverable en fragmentos de curso
 * ------------------------------------------------------------------------- */

[data-glossary-term] {
  position: relative;
  border-block-end: 1px dotted var(--accent);
  cursor: help;
  transition: color var(--duration-fast) var(--ease-out);
}

[data-glossary-term]:hover,
[data-glossary-term]:focus-visible {
  color: var(--text-accent);
}


/* ----------------------------------------------------------------------------
 *  5.15  Acordeón · unidades colapsables en fragmentos de curso
 * ------------------------------------------------------------------------- */

[data-accordion] {
  border-block-end: 1px solid var(--border);
}

[data-accordion] summary,
[data-accordion] > button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  width: 100%;
  font-family: var(--font-display);
  font-size: var(--text-h4);
  color: var(--text-heading);
  cursor: pointer;
  list-style: none;
  background: none;
  border: none;
  text-align: left;
}

[data-accordion] summary::-webkit-details-marker { display: none; }

[data-accordion][open] summary .accordion-icon,
[data-accordion][data-open="true"] .accordion-icon {
  transform: rotate(45deg);
}

.accordion-icon {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  transition: transform var(--duration-base) var(--ease-out);
}


/* ----------------------------------------------------------------------------
 *  5.16  Tabs · pestañas dentro de fragmentos (confesiones, rúbricas, etc)
 * ------------------------------------------------------------------------- */

[data-tabs] {
  display: block;
}

[data-tabs] [role="tablist"] {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  border-block-end: 1px solid var(--border);
  margin-block-end: var(--space-md);
}

[data-tabs] [role="tab"] {
  padding: 0.65rem 1rem;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  color: var(--text-secondary);
  background: none;
  border: none;
  border-block-end: 2px solid transparent;
  cursor: pointer;
  transition:
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

[data-tabs] [role="tab"][aria-selected="true"] {
  color: var(--text-primary);
  border-color: var(--accent);
}

[data-tabs] [role="tab"]:hover {
  color: var(--text-accent);
}

[data-tabs] [role="tabpanel"][hidden] {
  display: none;
}


/* ============================================================================
 *  6. UTILIDADES
 * ========================================================================= */

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.no-wrap    { white-space: nowrap; }
.text-mono  { font-family: var(--font-mono); }
.text-display { font-family: var(--font-display); }
.text-balance { text-wrap: balance; }
.text-pretty  { text-wrap: pretty; }

.hide-mobile  { display: initial; }
.hide-desktop { display: none; }

@media (max-width: 640px) {
  .hide-mobile  { display: none; }
  .hide-desktop { display: initial; }
}


/* ============================================================================
 *  7. ANIMACIONES
 * ========================================================================= */

@keyframes skeleton-shimmer {
  from { background-position: 200% 0; }
  to   { background-position: -200% 0; }
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(0.5rem); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Transición suave cuando el courseLoader inyecta contenido */
[data-main-content] > *:not(.skeleton-wrap):not(.initial-state) {
  animation: fade-in var(--duration-base) var(--ease-out);
}


/* ============================================================================
 *  8. MEDIA QUERIES · reduced-motion, print
 * ========================================================================= */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  html { scroll-behavior: auto; }
  .skeleton { animation: none; opacity: 0.6; }
}

@media print {
  :root {
    --bg-base: white;
    --text-primary: black;
    --text-heading: black;
  }

  body::before,
  .site-header,
  .site-footer,
  .nav-backdrop,
  .nav-toggle,
  .theme-toggle,
  .skip-link { display: none !important; }

  .site-main {
    min-height: auto;
    padding-block: 0;
  }

  a { text-decoration: underline; }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.85em;
    color: #555;
  }

  h1, h2, h3, h4 { break-after: avoid; }
  p, blockquote  { orphans: 3; widows: 3; }
}