/* ============================================================
   INSTITUTO LYRA — hoja de estilos
   Sistema de diseño institucional / editorial académico
   ============================================================ */

:root {
  /* Color — paleta minimalista, casi monocromática, con un único acento discreto */
  --ink:        #17171A;   /* negro tinta, fondo oscuro principal */
  --ink-2:      #202024;   /* negro tinta secundario, degradados sutiles */
  --paper:      #FAF9F5;   /* papel, fondo claro principal */
  --paper-2:    #EFEDE6;   /* papel en tono ligeramente más oscuro, franjas */
  --charcoal:   #29281F;   /* texto sobre papel */
  --accent:      #4B5245;  /* verde tinta apagado, único acento institucional */
  --accent-soft: #8B9083;  /* variante suave del acento, líneas y detalles */
  --mist:       #DEDBD2;   /* líneas divisorias sobre papel */
  --mist-dark:  rgba(250, 249, 245, 0.18); /* líneas divisorias sobre tinta */
  --paper-soft: rgba(250, 249, 245, 0.68);

  /* Tipografía */
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Ritmo */
  --section-pad: clamp(4.5rem, 9vw, 8rem);
  --content-w: 1180px;
  --edge: clamp(1.5rem, 5vw, 3.5rem);
}

/* ---------- Reset base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  
  font-family: var(--font-sans);
  color: var(--charcoal);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.nav-login {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 30px;
  color: white;
  text-decoration: none;
  white-space: nowrap;
}

.login-icon {
  width: 20px;
  height: 20px;
  color: white;
}

.nav-login:hover {
  opacity: 0.8;
}


.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark img {
  width: 34px;
  height: 34px;
  object-fit: cover;
  display: block;
  border-radius: 50%;
}

.brand-mark img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  display: block;
}

.brand-text {
  font-size: 1rem;
  white-space: nowrap;
}





img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.6em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1.1em; max-width: 62ch; }

.section-inner {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0 var(--edge);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.8em 1.2em;
  z-index: 1000;
}
.skip-link:focus {
  left: var(--edge);
  top: var(--edge);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- Elementos comunes ---------- */

.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--accent-soft);
  margin: 0 0 1em;
  font-weight: 500;
}
.eyebrow-dark { color: var(--accent); }

.lead-text {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.65;
  max-width: 58ch;
}

.text-link {
  display: inline-block;
  font-weight: 500;
  border-bottom: 1px solid var(--accent-soft);
  padding-bottom: 0.15em;
  transition: border-color 0.25s ease, opacity 0.25s ease;
}
.text-link:hover { border-color: var(--accent); }

.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.98rem;
  padding: 0.85em 1.8em;
  border: 1px solid currentColor;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}
.btn-primary {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}
.btn-primary:hover { background: transparent; color: var(--paper); }

.btn-ghost {
  color: var(--paper);
  border-color: var(--paper-soft);
}
.btn-ghost:hover { background: var(--paper); color: var(--ink); }

.btn-ghost-light {
  color: var(--charcoal);
  border-color: var(--mist);
}
.btn-ghost-light:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.section-heading { max-width: 720px; margin: 0 0 3.5rem; }
.section-intro { font-size: 1.05rem; color: #4A473F; }

/* Marcador visual de fallback cuando falta una fotografía */
.img-fallback {
  background: linear-gradient(155deg, var(--ink) 0%, var(--ink-2) 55%, var(--accent-soft) 150%);
  min-height: 260px;
  opacity: 0.9;
}

/* ============================================================
   HEADER
   ============================================================ */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 500;
  background: transparent;
  transition: background 0.35s ease, box-shadow 0.35s ease, padding 0.35s ease;
}
.site-header.is-scrolled {
  background: rgba(19, 33, 58, 0.92);
  backdrop-filter: blur(6px);
  box-shadow: 0 1px 0 var(--mist-dark);
}

.header-inner {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 1.3rem var(--edge);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--paper);
}
.brand-mark { color: var(--accent-soft); display: flex; }
.brand-text {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 2.2rem;
  margin: 0;
  padding: 0;
}
.site-nav a {
  color: var(--paper-soft);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
}
.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--accent-soft);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.site-nav a:hover { color: var(--paper); }
.site-nav a:hover::after { transform: scaleX(1); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  height: 1.5px;
  background: var(--paper);
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--ink);
}
.hero-media { position: absolute; inset: 0; }
.hero-img { width: 100%; height: 100%; object-fit: cover; }
.hero-img.img-fallback { height: 100%; }

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(0deg, rgba(15, 22, 36, 0.94) 0%, rgba(15, 22, 36, 0.55) 45%, rgba(15, 22, 36, 0.35) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--content-w);
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--edge) clamp(4rem, 9vw, 6.5rem);
  color: var(--paper);
}
.hero-content .eyebrow { color: var(--accent-soft); }
.hero-content h1 {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  max-width: 16ch;
  margin-bottom: 0.4em;
}
.hero-lead {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--paper-soft);
  max-width: 46ch;
  margin-bottom: 2.1em;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.scroll-cue {
  position: absolute;
  right: var(--edge);
  bottom: clamp(1.5rem, 3vw, 2.5rem);
  z-index: 2;
  width: 1px;
  height: 64px;
}
.scroll-cue-line {
  display: block;
  width: 1px;
  height: 100%;
  background: var(--paper-soft);
  transform-origin: top;
  animation: cue 2.6s ease-in-out infinite;
}
@keyframes cue {
  0% { transform: scaleY(0); opacity: 0; }
  35% { transform: scaleY(1); opacity: 1; }
  70% { transform: scaleY(1); opacity: 1; }
  100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .scroll-cue-line { animation: none; opacity: 1; transform: scaleY(1); }
}
@media (max-width: 640px) { .scroll-cue { display: none; } }

/* ============================================================
   PRESENTACIÓN
   ============================================================ */

.presentacion { padding: var(--section-pad) 0; }
.presentacion-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: start;
}
.presentacion-text h2 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); }

.presentacion-stats {
  display: flex;
  flex-direction: column;
  gap: 2.2rem;
  border-left: 1px solid var(--mist);
  padding-left: clamp(1.5rem, 3vw, 2.5rem);
}
.stat-number {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 0.15em;
  line-height: 1;
}
.stat-label { margin: 0; font-size: 0.94rem; color: #4A473F; max-width: 28ch; }

/* ============================================================
   CATEGORÍAS DEL REPOSITORIO
   ============================================================ */

.categorias { background: var(--paper-2); padding: var(--section-pad) 0; }

.categorias-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(2rem, 3.5vw, 3rem) clamp(1.6rem, 3vw, 2.4rem);
}

.categoria-card { display: flex; flex-direction: column; }

/* aspect-ratio fijo: todas las fotografías de categoría se ven al mismo tamaño,
   sin importar las dimensiones originales del archivo que se coloque */
.categoria-media {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--ink);
}
.categoria-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.categoria-card:hover .categoria-media img { transform: scale(1.04); }
.categoria-media img.img-fallback { height: 100%; min-height: 0; }

.categoria-card h3 {
  font-size: 1.2rem;
  margin-top: 1.2rem;
  margin-bottom: 0.4em;
}
.categoria-card p { color: #423F37; font-size: 0.96rem; margin-bottom: 0.7em; }

/* ============================================================
   PUBLICACIONES (sección oscura)
   ============================================================ */

.publicaciones {
  background: linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 100%);
  color: var(--paper);
  padding: var(--section-pad) 0;
}
.publicaciones-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
}
.publicaciones-media img { width: 100%; height: 100%; object-fit: cover; min-height: 360px; }
.publicaciones-text h2 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); color: var(--paper); }
.publicaciones-text p { color: var(--paper-soft); }

.publicaciones-lista {
  list-style: none;
  margin: 1.6rem 0 2.2rem;
  padding: 0;
  border-top: 1px solid var(--mist-dark);
}
.publicaciones-lista li {
  display: flex;
  gap: 1.4rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--mist-dark);
}
.pub-numero {
  flex: 0 0 auto;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--accent-soft);
  padding-top: 0.15em;
  min-width: 8ch;
}
.pub-titulo {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: var(--paper);
}

/* ============================================================
   DIVULGACIÓN
   ============================================================ */

.divulgacion { padding: var(--section-pad) 0; }

.divulgacion-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: clamp(1.8rem, 3vw, 2.5rem);
  margin-bottom: 2.5rem;
}
.evento {
  border-top: 1px solid var(--mist);
  padding-top: 1.4rem;
}
.evento--destacado { grid-row: span 1; }
.evento--destacado h3 { font-size: clamp(1.3rem, 2.2vw, 1.7rem); }
.evento h3 { font-size: 1.15rem; margin-bottom: 0.5em; }
.evento-fecha {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 0.8em;
}
.evento p { color: #423F37; font-size: 0.98rem; }

@media (max-width: 900px) {
  .divulgacion-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   CONTACTO
   ============================================================ */

.contacto {
  background: var(--paper-2);
  padding: var(--section-pad) 0;
}
.contacto-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(2.5rem, 6vw, 5rem);
}
.contacto-columnas {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.contacto-col h3 {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.9em;
}
.contacto-col p { font-size: 0.96rem; margin-bottom: 0.5em; }

@media (max-width: 760px) {
  .contacto-columnas { grid-template-columns: 1fr; }
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  background: var(--ink);
  color: var(--paper-soft);
  padding: 2.2rem 0;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
}
.footer-nav { display: flex; gap: 1.6rem; }
.footer-nav a:hover { color: var(--paper); }

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

/* ---- Escritorio pequeño / tablet horizontal (≤1024px) ---- */
@media (max-width: 1024px) {
  :root { --section-pad: clamp(3.5rem, 8vw, 6rem); }

  .categorias-grid { grid-template-columns: repeat(2, 1fr); }

  .contacto-columnas { grid-template-columns: repeat(2, 1fr); }
  .contacto-col:last-child { grid-column: 1 / -1; }
}

/* ---- Tablet vertical / móvil grande (≤900px) ---- */
@media (max-width: 900px) {
  .presentacion-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .presentacion-stats {
    border-left: none;
    border-top: 1px solid var(--mist);
    padding-left: 0;
    padding-top: 1.8rem;
    flex-direction: row;
    flex-wrap: wrap;
  }
  .stat-block { flex: 1 1 40%; }

  .publicaciones-grid { grid-template-columns: 1fr; }
  .publicaciones-media { aspect-ratio: 16 / 9; }
  .publicaciones-media img { width: 100%; height: 100%; object-fit: cover; min-height: 0; }

  .contacto-grid { grid-template-columns: 1fr; }
}

/* ---- Móvil (≤760px) ---- */
@media (max-width: 760px) {
  .site-nav {
    position: fixed;
    top: 0; right: 0;
    height: 100vh;
    width: min(78vw, 320px);
    background: var(--ink);
    padding: 6rem 2.2rem 2rem;
    transform: translateX(100%);
    transition: transform 0.35s ease;
    overflow-y: auto;
  }
  .site-nav.is-open { transform: translateX(0); }
  .site-nav ul { flex-direction: column; gap: 1.6rem; }
  .site-nav a { font-size: 1.05rem; }

  .nav-toggle { display: flex; z-index: 501; }

  .hero-actions { flex-direction: column; align-items: flex-start; }

  .categorias-grid { grid-template-columns: 1fr; gap: 2.2rem; }

  .contacto-columnas { grid-template-columns: 1fr; }
  .contacto-col:last-child { grid-column: auto; }

  .publicaciones-lista li { flex-direction: column; gap: 0.3rem; }

  .footer-inner { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .footer-nav { flex-wrap: wrap; gap: 1rem 1.4rem; }
}

/* ---- Móvil pequeño (≤420px) ---- */
@media (max-width: 420px) {
  .stat-block { flex-basis: 100%; }
  .brand-text { font-size: 1rem; }
  .header-inner { padding-top: 1.05rem; padding-bottom: 1.05rem; }
}
/* ============================================================
   VIDEO HERO RESPONSIVO
   ============================================================ */

.hero-video-mobile {
    display: none;
}


/* CELULAR */
@media (max-width: 760px) {

    .hero-video-desktop {
        display: none;
    }

    .hero-video-mobile {
        display: block;
    }

}