/* ==========================================
   VIBE CODING - Sistema de presentacion
   Estilo editorial, academico y profesional
   Version: refactor responsive (grid 12, type fluida)
   ========================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Fraunces:ital,opsz,wght@0,9..144,300..900;1,9..144,300..900&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* INK */
  --ink-900: #0a0a0a;
  --ink-800: #1a1a1a;
  --ink-700: #2a2a2a;
  --ink-600: #525252;
  --ink-500: #737373;
  --ink-400: #a3a3a3;
  --ink-300: #d4d4d4;
  --ink-200: #e5e5e5;
  --ink-100: #f5f5f5;
  --ink-50:  #fafafa;
  --paper:   #ffffff;

  /* ACCENT */
  --accent:        #b91c1c;
  --accent-soft:   #fef2f2;
  --accent-strong: #7f1d1d;

  /* FONTS */
  --font-display: 'Fraunces', Georgia, serif;
  --font-sans:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;

  /* TYPE SCALE — fluida, escala con viewport */
  --fs-base:   clamp(1rem, 0.92rem + 0.35vw, 1.1875rem);     /* 16px → 19px */
  --fs-lead:   clamp(1.125rem, 1.05rem + 0.4vw, 1.375rem);   /* 18 → 22 */
  --fs-title:  clamp(2rem, 1.5rem + 2.2vw, 3rem);            /* 32 → 48 */
  --fs-hero:   clamp(2.75rem, 1.6rem + 4.8vw, 4.75rem);      /* 44 → 76 */
  --fs-small:  clamp(0.85rem, 0.82rem + 0.1vw, 0.95rem);
  --fs-label:  clamp(0.7rem, 0.68rem + 0.1vw, 0.78rem);

  /* SPACING — escala 4-8pt, no se reduce con viewport */
  --s-0: 0.25rem;
  --s-1: 0.5rem;
  --s-2: 0.85rem;
  --s-3: 1.25rem;
  --s-4: 1.75rem;
  --s-5: 2.25rem;
  --s-6: 3rem;
  --s-7: 4rem;
  --s-8: 5.5rem;

  /* LAYOUT TOKENS */
  --content-max: 1600px;
  --content-pad: clamp(1.25rem, 2.5vw, 2.5rem);
  --gutter: clamp(1.25rem, 2.5vw, 2.5rem);
  --chrome-h: 56px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.55;
  color: var(--ink-900);
  background: var(--paper);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  position: relative;
  padding: 0;
  box-sizing: border-box;
}

/* El padding se aplica al slide directamente porque masthead y nav son fixed */
.slide {
  padding-top: var(--chrome-h) !important;
  padding-bottom: var(--chrome-h) !important;
}

.masthead,
.nav {
  position: fixed;
}

.masthead {
  top: 0;
  left: 0;
  right: 0;
}

.nav {
  bottom: 0;
  left: 0;
  right: 0;
}

/* Sin nav inferior: indice.html */
body.no-footer {
  padding-bottom: 0;
}

/* Cuando no hay nav inferior (ej. indice.html de un solo slide),
   el grid de 3 filas deja una fila vacía. Esta clase colapsa esa fila
   y compensa el espacio con padding-top para que el contenido no quede
   muy abajo (compensando la mitad de la altura de la nav ausente). */
body.no-footer {
  grid-template-rows: var(--chrome-h) 1fr;
}

body.no-footer .cover {
  justify-content: center !important;
  align-content: safe center;
  padding-top: 0 !important;
}

/* Si hay fondo animado, las cards se vuelven translucidas
   para que el código se vea a través */
body:has(.code-rain) .feature-card {
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

body:has(.code-rain) .feature-grid,
body:has(.code-rain) .feature-grid-4x2 {
  background: rgba(229, 229, 229, 0.4);
  border-color: rgba(229, 229, 229, 0.4);
}

::selection { background: var(--accent); color: var(--paper); }

/* ==========================================
   FONDO DECORATIVO: lluvia Matrix en margenes
   ========================================== */
.matrix-rain {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.matrix-rain-col {
  position: absolute;
  top: -200px;
  display: flex;
  flex-direction: column;
  font-family: 'Courier New', Courier, ui-monospace, monospace;
  font-size: 13px;
  line-height: 1.35;
  color: var(--ink-700);
  opacity: 0.14;
  animation: matrix-fall linear infinite;
  white-space: nowrap;
  user-select: none;
  /* Padding para que los caracteres no se peguen entre si */
  padding-right: 12px;
  /* Ancho explicito para reservar espacio y evitar solapamiento */
  width: 12px;
}

.matrix-rain-col .matrix-rain-char {
  display: block;
  width: 12px;
  text-align: center;
  animation: matrix-flicker 6s steps(2) infinite;
}

/* Cabeza de la columna: mas oscura y nitida (ef Matrix) */
.matrix-rain-char:nth-child(1) {
  color: var(--ink-900);
  font-weight: 500;
}
.matrix-rain-char:nth-child(2) {
  color: var(--ink-800);
}
.matrix-rain-char:nth-child(3) {
  color: var(--ink-600);
}
.matrix-rain-char:nth-child(n+4) {
  color: var(--ink-500);
}

@keyframes matrix-fall {
  0%   { transform: translateY(0); }
  100% { transform: translateY(calc(100vh + 120px + 30em)); }
}

@keyframes matrix-flicker {
  0%, 78%  { opacity: 1; }
  82%      { opacity: 0.3; }
  86%      { opacity: 1; }
  92%      { opacity: 0.5; }
  100%     { opacity: 1; }
}

@media (max-width: 900px) {
  .matrix-rain { display: none; }
}

@media print {
  .matrix-rain { display: none; }
}

/* ==========================================
   MASTHEAD (chrome superior)
   ========================================== */
.masthead {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--chrome-h);
  padding: 0 var(--content-pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-3);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--ink-200);
}

.masthead-brand {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  display: flex;
  align-items: center;
  gap: var(--s-1);
  min-width: 0;
}

.masthead-brand-mark {
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.masthead-meta {
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-500);
  font-weight: 500;
  white-space: nowrap;
}

/* ==========================================
   SLIDE — viewport completo, sin scroll
   ========================================== */
.slide {
  display: none;
  min-height: 0;
  height: 100%;
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--s-3) var(--content-pad) var(--s-4);
  opacity: 0;
  overflow: hidden;
}

.slide.active {
  display: flex;
  flex-direction: column;
  justify-content: center;
  /* Si el contenido es más alto que el viewport, anclar arriba (no centrar y cortar) */
  align-content: safe center;
  animation: reveal 0.55s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* En slides con cover (portada) queremos anclar arriba/abajo, no centrar */
.slide.active.cover {
  justify-content: space-between;
}

@keyframes reveal {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.slide > * { min-width: 0; }

.slide-number {
  position: absolute;
  top: var(--s-3);
  right: var(--content-pad);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  color: var(--ink-400);
  letter-spacing: 0.05em;
}

/* ==========================================
   EYEBROW
   ========================================== */
.eyebrow {
  font-size: var(--fs-label);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: var(--s-2);
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
}

.eyebrow::before {
  content: '';
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

/* ==========================================
   TIPOGRAFIA PRINCIPAL
   ========================================== */
.slide-title {
  font-family: var(--font-display);
  font-size: var(--fs-title);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  margin-bottom: var(--s-3);
  max-width: none;
}

.slide-title em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

.slide-lead {
  font-size: var(--fs-lead);
  line-height: 1.45;
  color: var(--ink-600);
  max-width: 70ch;
  font-weight: 400;
}

/* ==========================================
   LINEAS
   ========================================== */
.rule {
  width: 100%;
  height: 1px;
  background: var(--ink-200);
  margin: var(--s-3) 0;
}

.rule-short {
  width: 40px;
  height: 2px;
  background: var(--accent);
  margin-bottom: var(--s-2);
}

/* ==========================================
   PORTADA (slide.cover)
   ========================================== */
.cover {
  text-align: left;
  justify-content: center !important;
  align-content: safe center;
  padding-top: var(--s-3) !important;
  padding-bottom: var(--s-3) !important;
}

.cover-overline {
  font-size: var(--fs-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-500);
  margin-bottom: var(--s-2);
}

.cover-title {
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--ink-900);
  margin-bottom: var(--s-2);
  max-width: 16ch;
}

.cover-title em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}

.cover-subtitle {
  font-family: var(--font-display);
  font-size: var(--fs-lead);
  font-weight: 300;
  font-style: italic;
  color: var(--ink-600);
  max-width: 50ch;
  line-height: 1.4;
  margin-bottom: var(--s-4);
}

.cover-footer {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--s-3) var(--s-4);
  border-top: 1px solid var(--ink-200);
  padding-top: var(--s-3);
  margin-top: var(--s-3);
}

.cover-meta-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.cover-meta-label {
  font-size: var(--fs-label);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-500);
  font-weight: 500;
}

.cover-meta-value {
  font-size: 0.95rem;
  color: var(--ink-900);
  font-weight: 500;
  overflow-wrap: break-word;
}

/* ==========================================
   EDITORIAL LIST — FIX: bullet absolute, texto en flujo
   ========================================== */
.editorial-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  margin-top: var(--s-2);
  max-width: none;
}

.editorial-list li {
  position: relative;
  padding: var(--s-2) 0 var(--s-2) 28px;
  font-size: var(--fs-base);
  line-height: 1.5;
  color: var(--ink-700);
  border-bottom: 1px solid var(--ink-100);
}

.editorial-list li:last-child { border-bottom: none; }

.editorial-list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 1.35em;
  width: 8px;
  height: 8px;
  background: var(--accent);
}

.editorial-list strong {
  color: var(--ink-900);
  font-weight: 600;
}

/* ==========================================
   DOS COLUMNAS
   ========================================== */
.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s-5);
  margin-top: var(--s-2);
  align-items: start;
}

.col-block { min-width: 0; }

.col-block h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  margin-bottom: var(--s-2);
}

.col-block p {
  color: var(--ink-600);
  font-size: var(--fs-base);
  line-height: 1.55;
}

/* ==========================================
   FEATURE GRID
   ========================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--ink-200);
  border: 1px solid var(--ink-200);
  margin-top: var(--s-2);
}

/* Quita el subrayado de los feature-card cuando son <a> */
a.feature-card,
a.feature-card:link,
a.feature-card:visited {
  text-decoration: none;
  color: inherit;
}

a.feature-card:hover {
  background: var(--ink-50);
  color: inherit;
}

a.feature-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

/* Grid fijo 4 columnas x 2 filas (para indice / horarios) */
.feature-grid-4x2 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-200);
  border: 1px solid var(--ink-200);
  margin-top: var(--s-2);
}

.feature-grid-4x2 .feature-card {
  padding: var(--s-3);
}

.feature-grid-4x2 .feature-card h4 {
  font-size: 1.2rem;
  margin-bottom: 6px;
  line-height: 1.2;
}

.feature-grid-4x2 .feature-card p {
  font-size: 0.88rem;
  line-height: 1.5;
}

@media (max-width: 1100px) {
  .feature-grid-4x2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.feature-card {
  background: var(--paper);
  padding: var(--s-3);
  transition: background 0.2s ease;
  min-width: 0;
}

.feature-card:hover { background: var(--ink-50); }

.feature-card .num {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  color: var(--accent);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: var(--s-1);
}

.feature-card h4 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  margin-bottom: 6px;
}

.feature-card p {
  color: var(--ink-600);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ==========================================
   TIMELINE
   ========================================== */
.timeline {
  margin-top: var(--s-2);
  border-left: 1px solid var(--ink-200);
  padding-left: var(--s-3);
  max-width: none;
}

.timeline-item {
  position: relative;
  padding-bottom: var(--s-3);
  cursor: default;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--s-3) - 4px);
  top: 5px;
  width: 8px;
  height: 8px;
  background: var(--paper);
  border: 1.5px solid var(--ink-300);
  border-radius: 50%;
  transition: all 0.2s ease;
}

.timeline-item:hover::before {
  background: var(--accent);
  border-color: var(--accent);
  transform: scale(1.2);
}

.timeline-step {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
  display: block;
}

.timeline-item h4 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink-900);
  margin: 4px 0 4px;
  line-height: 1.2;
}

.timeline-item p {
  color: var(--ink-600);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Timeline con tipografía más generosa para slides con pocas sesiones */
.timeline-lg .timeline-item {
  padding-bottom: var(--s-4);
}

.timeline-lg .timeline-item h4 {
  font-size: 1.4rem;
  margin: 6px 0 6px;
}

.timeline-lg .timeline-item p {
  font-size: 1.05rem;
  line-height: 1.55;
}

/* ==========================================
   PULL QUOTE
   ========================================== */
.pull-quote {
  max-width: 50ch;
  margin: var(--s-2) 0;
}

.pull-quote blockquote {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.1rem);
  font-weight: 300;
  font-style: italic;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  margin-bottom: var(--s-2);
}

.pull-quote cite {
  font-style: normal;
  font-size: var(--fs-small);
  color: var(--ink-500);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: var(--s-1);
}

.pull-quote cite::before {
  content: '';
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

/* ==========================================
   CODE BLOCK
   ========================================== */
.code-block {
  background: var(--ink-900);
  color: var(--ink-100);
  border-radius: 4px;
  padding: var(--s-3) var(--s-3);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  overflow: auto;
  margin-top: var(--s-2);
  max-height: 100%;
}

.code-block .comment { color: var(--ink-500); font-style: italic; }
.code-block .keyword { color: #f87171; }
.code-block .string  { color: #86efac; }
.code-block .func    { color: #93c5fd; }

/* ==========================================
   COLOPHON
   ========================================== */
.colophon {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: var(--s-3);
  margin-top: var(--s-3);
  padding-top: var(--s-2);
  border-top: 1px solid var(--ink-200);
}

.colophon p {
  font-size: 0.85rem;
  color: var(--ink-500);
}

.colophon strong {
  color: var(--ink-900);
  font-weight: 600;
}

/* ==========================================
   NAV INFERIOR (chrome simetrico)
   ========================================== */
.nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--chrome-h);
  z-index: 100;
  padding: 0 var(--content-pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-3);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-top: 1px solid var(--ink-200);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--s-1);
}

.nav-btn {
  width: 34px;
  height: 34px;
  border: 1px solid var(--ink-200);
  background: var(--paper);
  color: var(--ink-700);
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.nav-btn:hover:not(:disabled) {
  border-color: var(--ink-900);
  color: var(--ink-900);
}

.nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.nav-btn svg { width: 14px; height: 14px; }

.nav-progress {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  color: var(--ink-500);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: var(--s-1);
}

.nav-progress-bar {
  width: 80px;
  height: 2px;
  background: var(--ink-200);
  position: relative;
  margin-left: var(--s-1);
}

.nav-progress-fill {
  position: absolute;
  top: 0; left: 0;
  height: 100%;
  background: var(--accent);
  transition: width 0.4s ease;
}

/* ==========================================
   UTILIDADES
   ========================================== */
.muted   { color: var(--ink-500); }
.accent  { color: var(--accent); }
.mono    { font-family: var(--font-mono); }
.serif   { font-family: var(--font-display); }
.italic  { font-style: italic; }

/* ==========================================
   RESPONSIVE
   ========================================== */

/* laptops chicas / proyectores SVGA 1024 */
@media (max-width: 1100px) {
  :root {
    --content-max: 100%;
    --fs-title: clamp(1.75rem, 1.4rem + 1.8vw, 2.5rem);
    --fs-hero:  clamp(2.5rem, 1.5rem + 4vw, 4rem);
  }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .two-col { gap: var(--s-4); }
  .col-block h3 { font-size: 1.2rem; }
}

/* tablets y laptops chicas */
@media (max-width: 900px) {
  :root {
    --chrome-h: 50px;
    --content-pad: 1.25rem;
  }
  .feature-grid { grid-template-columns: 1fr; }
  .cover-footer { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .two-col { grid-template-columns: 1fr; gap: var(--s-3); }
  .slide-number { display: none; }
  .masthead-meta { display: none; }
  .nav-progress-bar { display: none; }
}

/* moviles */
@media (max-width: 600px) {
  :root {
    --gutter: 0.75rem;
    --fs-title: clamp(1.5rem, 1.2rem + 1.5vw, 1.85rem);
    --fs-hero:  clamp(2rem, 1.4rem + 2.5vw, 2.75rem);
    --fs-lead:  1rem;
  }
  .slide { padding: var(--s-2) var(--content-pad); }
  .cover-footer { grid-template-columns: 1fr; }
  .editorial-list { max-width: none; }
  .timeline { max-width: none; }
}

/* alturas chicas */
@media (max-height: 700px) {
  :root {
    --chrome-h: 44px;
    --fs-title: clamp(1.5rem, 1.2rem + 1.5vw, 2.1rem);
    --fs-hero:  clamp(2rem, 1.2rem + 3vw, 3rem);
    --fs-lead:  1rem;
  }
  .slide-title { margin-bottom: var(--s-2); }
  .rule { margin: var(--s-2) 0; }
  .editorial-list li { padding: var(--s-1) 0 var(--s-1) 24px; }
  .timeline-item { padding-bottom: var(--s-2); }
  .feature-card { padding: var(--s-2); }
  .col-block h3 { font-size: 1.1rem; margin-bottom: var(--s-1); }
  .pull-quote blockquote { font-size: 1.4rem; }
}

@media (max-height: 560px) {
  :root {
    --fs-title: 1.5rem;
    --fs-hero: 2rem;
    --fs-lead: 0.95rem;
    --fs-base: 0.92rem;
  }
  .eyebrow { margin-bottom: 0.5rem; }
  .rule { margin: var(--s-1) 0; }
  .editorial-list li { padding: 0.4rem 0 0.4rem 22px; }
  .timeline-item { padding-bottom: var(--s-1); }
  .feature-card { padding: var(--s-2); }
}

/* print */
@media print {
  body { display: block; height: auto; overflow: visible; }
  html { overflow: visible; }
  .nav, .masthead { display: none; }
  .slide {
    display: flex !important;
    opacity: 1 !important;
    page-break-after: always;
    height: 100vh;
  }
}