/* ============================================================
   HISTORIA ARGENTINA — BASE CSS
   Variables, tipografía, reset
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;0,900;1,400;1,700&family=Source+Serif+4:ital,wght@0,300;0,400;0,600;1,300;1,400&family=DM+Mono:wght@400;500&display=swap');

/* === TOKENS === */
:root {
  /* Paleta — pergamino, tinta y bandera */
  --color-crema:       #F7F2E8;
  --color-pergamino:   #EDE4CC;
  --color-sepia:       #6B4C2A;
  --color-tinta:       #2C1810;
  --color-celeste:     #74ACDF;
  --color-celeste-dp:  #4A8CC0;
  --color-blanco:      #FFFFFF;
  --color-oro:         #C8962A;
  --color-rojo-patria: #A0271A;
  --color-verde-selva: #2D6A4F;

  /* Fondos */
  --bg-principal:  #F7F2E8;
  --bg-secundario: #EDE4CC;
  --bg-oscuro:     #1C1208;
  --bg-card:       #FFFFFF;

  /* Texto */
  --text-principal:   #2C1810;
  --text-secundario:  #6B4C2A;
  --text-suave:       #9A7B5A;
  --text-invertido:   #F7F2E8;

  /* Bordes */
  --borde-suave: rgba(107, 76, 42, 0.15);
  --borde-medio: rgba(107, 76, 42, 0.30);
  --borde-fuerte: rgba(107, 76, 42, 0.60);

  /* Sombras */
  --sombra-card: 0 2px 12px rgba(44, 24, 16, 0.08);
  --sombra-hover: 0 8px 32px rgba(44, 24, 16, 0.16);
  --sombra-pronunciada: 0 16px 48px rgba(44, 24, 16, 0.24);

  /* Tipografía */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Source Serif 4', Georgia, serif;
  --font-mono:    'DM Mono', 'Courier New', monospace;

  /* Escala tipográfica */
  --size-xs:   0.75rem;
  --size-sm:   0.875rem;
  --size-base: 1rem;
  --size-md:   1.125rem;
  --size-lg:   1.25rem;
  --size-xl:   1.5rem;
  --size-2xl:  1.875rem;
  --size-3xl:  2.25rem;
  --size-4xl:  3rem;
  --size-5xl:  3.75rem;
  --size-6xl:  4.5rem;

  /* Espaciado */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Bordes radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transiciones */
  --trans-rapida:  all 0.15s ease;
  --trans-normal:  all 0.25s ease;
  --trans-lenta:   all 0.4s ease;

  /* Layout */
  --max-content: 1200px;
  --max-texto:   720px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--size-base);
  line-height: 1.7;
  color: var(--text-principal);
  background-color: var(--bg-principal);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Fondo con textura sutil de papel */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='400' height='400' filter='url(%23noise)' opacity='0.025'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: -1;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-celeste-dp); text-decoration: none; transition: var(--trans-rapida); }
a:hover { color: var(--color-sepia); }
a:focus-visible { outline: 2px solid var(--color-celeste); outline-offset: 2px; border-radius: var(--radius-sm); }
ul, ol { list-style: none; }
button { cursor: pointer; font-family: var(--font-body); border: none; background: none; }
input, select, textarea { font-family: var(--font-body); font-size: var(--size-base); }

/* === TIPOGRAFÍA BASE === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--text-principal);
  font-weight: 700;
}

h1 { font-size: clamp(var(--size-3xl), 5vw, var(--size-6xl)); }
h2 { font-size: clamp(var(--size-2xl), 3.5vw, var(--size-4xl)); }
h3 { font-size: clamp(var(--size-xl), 2.5vw, var(--size-3xl)); }
h4 { font-size: clamp(var(--size-lg), 2vw, var(--size-2xl)); }
h5 { font-size: var(--size-lg); }
h6 { font-size: var(--size-base); }

p { margin-bottom: var(--space-4); max-width: 70ch; }
p:last-child { margin-bottom: 0; }

.font-mono { font-family: var(--font-mono); }
.text-sepia { color: var(--text-secundario); }
.text-suave { color: var(--text-suave); }
.text-celeste { color: var(--color-celeste-dp); }
.text-oro { color: var(--color-oro); }

/* === UTILIDADES === */
.contenedor {
  width: 100%;
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.contenedor-angosto {
  width: 100%;
  max-width: var(--max-texto);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.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;
}

.oculto { display: none !important; }

/* === SEPARADOR ORNAMENTAL === */
.separador {
  text-align: center;
  margin: var(--space-12) auto;
  color: var(--text-suave);
  font-family: var(--font-display);
  font-size: var(--size-xl);
  letter-spacing: 0.5em;
}

.separador::before,
.separador::after {
  content: '';
  display: inline-block;
  vertical-align: middle;
  width: 80px;
  height: 1px;
  background: var(--borde-medio);
  margin: 0 var(--space-4);
}

/* === BADGE / ETIQUETA === */
.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge-celeste { background: rgba(116,172,223,0.15); color: var(--color-celeste-dp); border: 1px solid rgba(116,172,223,0.3); }
.badge-sepia   { background: rgba(107,76,42,0.1);  color: var(--color-sepia);    border: 1px solid rgba(107,76,42,0.2); }
.badge-oro     { background: rgba(200,150,42,0.1); color: var(--color-oro);      border: 1px solid rgba(200,150,42,0.25); }
.badge-rojo    { background: rgba(160,39,26,0.1);  color: var(--color-rojo-patria); border: 1px solid rgba(160,39,26,0.2); }

/* === BOTONES === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--size-base);
  font-weight: 600;
  transition: var(--trans-normal);
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible { outline: 2px solid var(--color-celeste); outline-offset: 2px; }

.btn-primario {
  background: var(--color-celeste-dp);
  color: var(--color-blanco);
  border-color: var(--color-celeste-dp);
}
.btn-primario:hover {
  background: #3A7BB0;
  border-color: #3A7BB0;
  color: var(--color-blanco);
  transform: translateY(-1px);
  box-shadow: var(--sombra-hover);
}

.btn-secundario {
  background: transparent;
  color: var(--color-celeste-dp);
  border-color: var(--color-celeste-dp);
}
.btn-secundario:hover {
  background: var(--color-celeste-dp);
  color: var(--color-blanco);
}

.btn-sepia {
  background: var(--color-sepia);
  color: var(--color-crema);
  border-color: var(--color-sepia);
}
.btn-sepia:hover {
  background: var(--color-tinta);
  border-color: var(--color-tinta);
  color: var(--color-crema);
  transform: translateY(-1px);
}

.btn-sm { padding: var(--space-2) var(--space-4); font-size: var(--size-sm); }
.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--size-md); }

/* === ANIMACIONES === */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes pulso {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.6; }
}

.animar-entrada { animation: fadeIn 0.5s ease both; }

/* Respetar preferencia de movimiento reducido */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* === RESPONSIVE BASE === */
@media (max-width: 768px) {
  :root { --space-6: 1rem; }
  .contenedor { padding: 0 var(--space-4); }
}

/* ============================================================
   ACCESIBILIDAD ESCOLAR — Refuerzo
   Tipografía más grande, contraste alto, foco visible
   ============================================================ */

/* Escala base mayor para pantallas escolares / tablets */
@media (min-width: 768px) {
  html { font-size: 17px; }
}
@media (min-width: 1200px) {
  html { font-size: 18px; }
}

/* Modo alto contraste del sistema */
@media (forced-colors: active) {
  .btn, .badge, .card-periodo, .flashcard-cara {
    border: 2px solid ButtonText;
  }
  .quiz-opcion { border: 2px solid ButtonText; }
}

/* Focus visible muy marcado — esencial para teclado y lectores */
:focus-visible {
  outline: 3px solid var(--color-celeste-dp) !important;
  outline-offset: 3px !important;
  border-radius: var(--radius-sm);
}

/* Skip link para saltar navegación */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-celeste-dp);
  color: white;
  padding: var(--space-3) var(--space-6);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  font-weight: 700;
  font-size: var(--size-sm);
  z-index: 9999;
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus { top: 0; }

/* Texto de lectura más espaciado para estudiantes */
.texto-escolar {
  font-size: var(--size-md);
  line-height: 1.8;
  letter-spacing: 0.01em;
}

/* Párrafos con line-height extra en contexto educativo */
.seccion p,
.panel-periodo p,
.corrientes-dato-card p,
.lt-descripcion,
.card-periodo-desc {
  line-height: 1.75;
}

/* Contraste garantizado en todos los badges */
.badge-celeste { color: #1A5F9E; }  /* WCAG AA sobre fondo claro */
.badge-rojo    { color: #8B1A10; }
.badge-oro     { color: #7A5A10; }

/* Aumentar tamaño mínimo de targets táctiles a 44×44px */
.btn, .nav-links a, .filtro-btn, .panel-tab, .quiz-opcion {
  min-height: 44px;
}
.nav-links a { 
  display: flex;
  align-items: center;
  min-height: 44px;
}

/* Iconos decorativos ocultos para AT */
[aria-hidden="true"] { user-select: none; }