/* ==========================================================================
   CENS Nº454 — Identidad visual (design system)
   Sobre Bootstrap 5.3. Institucional, sobrio, moderno.
   Estructura:
     1. Variables (:root)
     2. Base / tipografía
     3. Navbar
     4. Botones
     5. Hero
     6. Secciones y utilidades
     7. Cards
     8. Timeline (historia)
     9. Galería + lightbox
     10. Footer
     11. Responsive
   ========================================================================== */

/* 1. VARIABLES ------------------------------------------------------------- */
:root {
  /* Paleta extraída del logo CENS 454 */
  --color-primary:       #001830;  /* azul marino oscuro (logo) */
  --color-primary-dark:  #000e1e;
  --color-primary-600:   #002444;
  --color-accent:        #C9A050;  /* dorado (libro, borde, texto logo) */
  --color-accent-dark:   #A07830;
  --color-accent-soft:   #f7efe0;

  --color-ink:    #1a2433;  /* texto principal */
  --color-body:   #3d4e60;  /* texto secundario */
  --color-muted:  #7a8898;
  --color-line:   #e3e8ef;
  --color-bg:     #ffffff;
  --color-bg-alt: #f6f7f9;

  /* Tipografía */
  --font-head: "Lora", Georgia, "Times New Roman", serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* Forma */
  --radius:    14px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0, 24, 48, .06), 0 1px 2px rgba(0, 24, 48, .08);
  --shadow:    0 10px 30px rgba(0, 24, 48, .09);
  --shadow-lg: 0 20px 50px rgba(0, 24, 48, .15);
  --transition: .25s cubic-bezier(.4, 0, .2, 1);

  /* Override de variables de Bootstrap */
  --bs-primary: var(--color-primary);
  --bs-body-color: var(--color-body);
  --bs-body-font-family: var(--font-body);
  --bs-link-color: var(--color-accent-dark);
  --bs-link-hover-color: var(--color-primary);
}

/* 2. BASE / TIPOGRAFÍA ----------------------------------------------------- */
body {
  font-family: var(--font-body);
  color: var(--color-body);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, .display-1, .display-2, .display-3, .display-4 {
  font-family: var(--font-head);
  color: var(--color-ink);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -.01em;
}

h1, .h1 { font-size: clamp(2rem, 1.4rem + 2.6vw, 3.1rem); }
h2, .h2 { font-size: clamp(1.6rem, 1.2rem + 1.7vw, 2.3rem); }
h3, .h3 { font-size: clamp(1.25rem, 1.05rem + .8vw, 1.6rem); }

p { line-height: 1.75; }

a { text-decoration: none; transition: color var(--transition); }

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

/* Encabezado de sección reutilizable */
.section-eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  margin-bottom: .75rem;
}
.section-title { margin-bottom: 1rem; }
.section-intro { color: var(--color-body); max-width: 60ch; }

/* 3. NAVBAR ---------------------------------------------------------------- */
/* Franja institucional (oficial) — solo desktop, fija sobre la navbar */
.gov-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1031;                 /* por encima de la navbar fixed-top (1030) */
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, .72);
  font-size: .78rem;
  letter-spacing: .02em;
  padding-block: .4rem;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.gov-bar i { color: var(--color-accent); margin-right: .35rem; }
@media (min-width: 992px) {
  .navbar.site-nav.fixed-top { top: 33px; }   /* deja lugar a la franja */
}

.navbar.site-nav {
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(10px);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), box-shadow var(--transition);
  padding-block: .65rem;
}
.navbar.site-nav .navbar-brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -.02em;
}
.navbar-brand .brand-logo {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.brand-text small {
  display: block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: .68rem;
  color: var(--color-muted);
  letter-spacing: .02em;
}
.navbar.site-nav .nav-link {
  font-weight: 500;
  color: var(--color-ink);
  padding-inline: .9rem;
  position: relative;
}
.navbar.site-nav .nav-link::after {
  content: "";
  position: absolute;
  left: .9rem; right: .9rem; bottom: .35rem;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.navbar.site-nav .nav-link:hover::after,
.navbar.site-nav .nav-link.active::after { transform: scaleX(1); }
.navbar.site-nav .nav-link.active { color: var(--color-primary); }

/* 4. BOTONES --------------------------------------------------------------- */
.btn { font-weight: 600; border-radius: var(--radius-sm); padding: .6rem 1.4rem; transition: all var(--transition); }
.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-accent { background: var(--color-accent); border-color: var(--color-accent); color: #08233f; }
.btn-accent:hover { background: var(--color-accent-dark); border-color: var(--color-accent-dark); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-outline-light:hover { color: var(--color-primary); }
.btn-outline-primary { color: var(--color-primary); border-color: var(--color-primary); }
.btn-outline-primary:hover { background: var(--color-primary); border-color: var(--color-primary); }

/* 5. HERO ------------------------------------------------------------------ */
.hero {
  position: relative;
  color: #fff;
  padding: clamp(5rem, 4rem + 9vw, 9rem) 0 clamp(3.5rem, 3rem + 5vw, 6rem);
  background: linear-gradient(120deg, var(--color-primary-dark) 0%, var(--color-primary) 55%, var(--color-primary-600) 100%);
  overflow: hidden;
}
.hero::after {  /* franja celeste decorativa */
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 5px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
}
.hero--image::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(10, 32, 56, .92), rgba(15, 46, 82, .78));
  z-index: 0;
}
.hero--image {
  background-size: cover;
  background-position: center;
}
.hero > .container { position: relative; z-index: 1; }
.hero h1 { color: #fff; }
.hero .hero-tagline { font-size: clamp(1.05rem, .95rem + .6vw, 1.4rem); color: #cfe0f0; max-width: 48ch; }
.hero .badge-soft {
  background: rgba(107, 168, 214, .2);
  color: #d7e8f7;
  border: 1px solid rgba(107, 168, 214, .4);
  font-weight: 500;
  letter-spacing: .03em;
}
/* Hero compacto para páginas internas */
.page-hero { padding: clamp(3.5rem, 3rem + 5vw, 6rem) 0 clamp(2rem, 1.6rem + 3vw, 3.5rem); }
.page-hero .breadcrumb-light { --bs-breadcrumb-divider-color: rgba(255,255,255,.5); }
.page-hero .breadcrumb-light a { color: #cfe0f0; }
.page-hero .breadcrumb-light .active { color: #fff; }

/* Parallax — fondo fijo al scrollear */
.parallax {
  background-attachment: fixed !important;
}
/* Móvil / iOS: fixed no funciona bien, caemos a scroll normal */
@media (max-width: 991.98px) {
  .parallax { background-attachment: scroll !important; }
}

/* 5b. SLIDER DEL HOME ------------------------------------------------------- */
.hero-slider .hero { padding-block: clamp(5rem, 4rem + 9vw, 9rem); }
.hero-slider .carousel-indicators { margin-bottom: 1.5rem; z-index: 3; }
.hero-slider .carousel-indicators button { width: 10px; height: 10px; border-radius: 50%; border: 0; }
.hero-slider .carousel-control-prev, .hero-slider .carousel-control-next { width: 6%; z-index: 3; opacity: .7; }
.hero-slider .carousel-control-prev:hover, .hero-slider .carousel-control-next:hover { opacity: 1; }

/* WhatsApp flotante */
.whatsapp-float {
  position: fixed;
  right: 20px; bottom: 20px;
  z-index: 1050;
  height: 58px;
  display: inline-flex; align-items: center; gap: .55rem;
  padding: 0 1.1rem 0 1.3rem;
  background: #25d366;
  color: #fff;
  border-radius: 50px;
  font-size: 1.8rem;
  box-shadow: 0 6px 18px rgba(0,0,0,.25);
  transition: transform var(--transition), background var(--transition);
}
.whatsapp-float-text { font-family: var(--font-body); font-size: 1rem; font-weight: 600; }
.whatsapp-float:hover { background: #1ebe5b; color: #fff; transform: scale(1.05); }
/* Móvil: botón circular sin texto para no ocupar espacio */
@media (max-width: 575.98px) {
  .whatsapp-float { width: 52px; height: 52px; padding: 0; justify-content: center; font-size: 1.6rem; border-radius: 50%; }
  .whatsapp-float-text { display: none; }
}

/* 6. SECCIONES / UTILIDADES ------------------------------------------------ */
.section { padding-block: clamp(3.5rem, 3rem + 4vw, 6rem); }
.section--alt { background: var(--color-bg-alt); }
.section--primary { background: var(--color-primary); color: #fff; }
.section--primary h1, .section--primary h2, .section--primary h3 { color: #fff; }
.bg-soft { background: var(--color-accent-soft); }
.text-accent { color: var(--color-accent-dark) !important; }
.lead-quote {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 1.1rem + 1.4vw, 2.1rem);
  font-style: italic;
  line-height: 1.4;
}
.divider-accent { width: 64px; height: 4px; background: var(--color-accent); border-radius: 4px; border: 0; opacity: 1; }

/* 7. CARDS ----------------------------------------------------------------- */
.card-feature {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 1.9rem 1.6rem;
  height: 100%;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card-feature:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.card-feature .feature-icon {
  display: grid; place-items: center;
  width: 52px; height: 52px;
  border-radius: 12px;
  background: var(--color-accent-soft);
  color: var(--color-primary);
  margin-bottom: 1.1rem;
  font-size: 1.4rem;
}
.card-feature h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.card-feature p { color: var(--color-body); margin-bottom: 0; font-size: .96rem; }

.news-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  height: 100%;
  transition: transform var(--transition), box-shadow var(--transition);
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.news-card .news-body { padding: 1.5rem; }
.news-card .news-date { font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--color-accent-dark); }
.news-card h3 { font-size: 1.15rem; margin: .4rem 0 .6rem; }

/* Tarjeta de orientación / oferta */
.program-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  height: 100%;
  background: #fff;
  transition: box-shadow var(--transition), transform var(--transition);
}
.program-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.program-card .program-head { background: var(--color-primary); color: #fff; padding: 1.4rem 1.6rem; }
.program-card .program-head h3 { color: #fff; margin: 0; }
.program-card .program-body { padding: 1.6rem; }

/* Lista de equipo docente */
.staff-list { columns: 2; column-gap: 2.5rem; }
.staff-list li { break-inside: avoid; padding: .35rem 0; border-bottom: 1px dashed var(--color-line); color: var(--color-ink); }
@media (min-width: 992px) { .staff-list { columns: 3; } }

/* 8. TIMELINE -------------------------------------------------------------- */
.timeline { position: relative; padding-left: 0; list-style: none; margin: 0; }
.timeline::before {
  content: "";
  position: absolute;
  left: 18px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(var(--color-accent), var(--color-line));
}
.timeline-item { position: relative; padding: 0 0 2.2rem 3.4rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item .timeline-dot {
  position: absolute; left: 9px; top: 2px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--color-accent);
  box-shadow: 0 0 0 4px #fff;
}
.timeline-item .timeline-year {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
  padding: .2rem .7rem;
  border-radius: 50px;
  margin-bottom: .6rem;
}
.timeline-item h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.timeline-item p { color: var(--color-body); margin-bottom: 0; }

/* 9. GALERÍA + LIGHTBOX ---------------------------------------------------- */
.gallery-year-title {
  display: flex; align-items: center; gap: 1rem;
  margin: 2.5rem 0 1.4rem;
}
.gallery-year-title .year-badge {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--color-primary);
}
.gallery-year-title .year-line { flex: 1; height: 1px; background: var(--color-line); }

.gallery-search { position: relative; max-width: 480px; }
.gallery-search i { position: absolute; left: 1rem; top: 50%; transform: translateY(-50%); color: var(--color-muted); }
.gallery-search input { padding-left: 2.6rem; border-radius: 50px; }

.gallery-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 1rem; }
.gallery-item {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-alt);
  box-shadow: var(--shadow-sm);
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item .gallery-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(10,32,56,.85) 0%, rgba(10,32,56,0) 55%);
  display: flex; align-items: flex-end;
  padding: .9rem;
  opacity: 0;
  transition: opacity var(--transition);
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-item .gallery-overlay span { color: #fff; font-size: .82rem; font-weight: 500; line-height: 1.3; }

/* Lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 1080;
  background: rgba(8, 20, 36, .94);
  display: none;
  align-items: center; justify-content: center;
  padding: 2rem;
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 92vw; max-height: 80vh; border-radius: var(--radius-sm); box-shadow: var(--shadow-lg); }
.lightbox .lb-caption { position: absolute; bottom: 1.5rem; left: 0; right: 0; text-align: center; color: #cfe0f0; font-size: .95rem; padding: 0 1rem; }
.lightbox .lb-close, .lightbox .lb-nav {
  position: absolute;
  z-index: 2;                /* siempre por encima de la imagen (evita que la tape) */
  background: rgba(255,255,255,.12);
  color: #fff; border: 0;
  width: 48px; height: 48px;
  border-radius: 50%;
  font-size: 1.4rem; cursor: pointer;
  display: grid; place-items: center;
  transition: background var(--transition);
}
.lightbox .lb-close:hover, .lightbox .lb-nav:hover { background: rgba(255,255,255,.28); }
.lightbox .lb-close { top: 1.2rem; right: 1.2rem; }
.lightbox .lb-prev { left: 1.2rem; top: 50%; transform: translateY(-50%); }
.lightbox .lb-next { right: 1.2rem; top: 50%; transform: translateY(-50%); }

/* 9c. FAQ / ACORDEÓN --------------------------------------------------------- */
.accordion-item { border: 1px solid var(--color-line); border-radius: var(--radius-sm) !important; overflow: hidden; margin-bottom: .75rem; }
.accordion-button { font-family: var(--font-body); font-weight: 600; color: var(--color-ink); }
.accordion-button:not(.collapsed) { background: var(--color-accent-soft); color: var(--color-primary); box-shadow: none; }
.accordion-button:focus { box-shadow: 0 0 0 .2rem rgba(201,160,80,.25); }
.accordion-button::after { filter: none; }

/* 9b. BLOG / ENTRADA ------------------------------------------------------- */
.blog-filters .btn { border-radius: 50px; font-weight: 500; }
.post-body { font-size: 1.06rem; }
.post-body p { margin-bottom: 1.1rem; }
.post-credit {
  background: var(--color-accent-soft);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
  color: var(--color-ink);
  font-size: .98rem;
}

/* 10. FOOTER --------------------------------------------------------------- */
.site-footer { background: var(--color-primary-dark); color: #b9c6d4; padding-top: 3.5rem; }
.site-footer h5 { color: #fff; font-family: var(--font-body); font-weight: 600; font-size: 1rem; letter-spacing: .02em; margin-bottom: 1.1rem; }
.site-footer a { color: #b9c6d4; }
.site-footer a:hover { color: var(--color-accent); }
.site-footer .footer-brand { display: flex; align-items: center; gap: .75rem; color: #fff; font-family: var(--font-head); font-weight: 700; font-size: 1.15rem; margin-bottom: 1rem; }
.site-footer .footer-logo { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.site-footer .footer-list { list-style: none; padding: 0; margin: 0; }
.site-footer .footer-list li { padding: .3rem 0; }
.site-footer .footer-contact li { display: flex; gap: .6rem; padding: .3rem 0; }
.site-footer .footer-social a { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; background: rgba(255,255,255,.08); margin-right: .5rem; transition: background var(--transition); }
.site-footer .footer-social a:hover { background: var(--color-accent); color: #fff; }
.site-footer .footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 2.5rem; padding: 1.3rem 0; font-size: .85rem; }
.site-footer .footer-legal-links a { text-decoration: underline; text-underline-offset: 3px; }
.site-footer .footer-legal-links span { margin: 0 .5rem; opacity: .5; }

/* 11. RESPONSIVE ----------------------------------------------------------- */
@media (max-width: 991.98px) {
  .navbar.site-nav .navbar-collapse { background: #fff; border-radius: var(--radius-sm); padding: 1rem; margin-top: .6rem; box-shadow: var(--shadow); }
  .navbar.site-nav .nav-link::after { display: none; }
}
@media (max-width: 575.98px) {
  .staff-list { columns: 1; }
  .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}

/* Animación de entrada sutil */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.is-visible { opacity: 1; transform: none; }
}