html { scroll-behavior: smooth; }
* { box-sizing: border-box; }
body {
  margin: 0;
  background: #FBFAF6;
  color: #001A4F;
  font-family: 'IBM Plex Sans', sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: #001A4F; text-decoration: none; }
a:hover { color: #006FC9; }
::selection { background: #FFB900; color: #001A4F; }
img, video { max-width: 100%; }

/* pill link hover: letter-spacing widen */
.pill { transition: letter-spacing 800ms cubic-bezier(0.19,1,0.22,1), border-color 800ms cubic-bezier(0.19,1,0.22,1), color 400ms ease; }
.pill:hover { letter-spacing: .05em; }

/* ══ Barra superior liquid-glass ══ */
#side-nav {
  position: fixed;
  left: clamp(16px, 2.6vw, 40px);
  top: clamp(16px, 2.4vh, 34px);
  z-index: 100;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 2px;
  padding: 10px 14px;
  border-radius: 28px;
  border: 1px solid transparent;
  background: transparent;
  box-shadow: none;
  transition: background 700ms cubic-bezier(.19,1,.22,1),
              border-color 700ms cubic-bezier(.19,1,.22,1),
              box-shadow 700ms cubic-bezier(.19,1,.22,1),
              padding 700ms cubic-bezier(.19,1,.22,1),
              backdrop-filter 700ms cubic-bezier(.19,1,.22,1),
              -webkit-backdrop-filter 700ms cubic-bezier(.19,1,.22,1);
}

#side-nav.is-open {
  padding: 12px 22px;
  background: rgba(251,250,246,.5);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border-color: rgba(0,26,79,.14);
  box-shadow: 0 12px 42px rgba(0,26,79,.15), inset 0 1px 0 rgba(255,255,255,.65);
}
#side-nav.on-dark.is-open {
  background: rgba(0,26,79,.34);
  border-color: rgba(251,250,246,.22);
  box-shadow: 0 12px 42px rgba(0,0,0,.32), inset 0 1px 0 rgba(255,255,255,.2);
}

.sn-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 10px;
  color: #001A4F;
  transition: color 500ms ease;
}
#side-nav.on-dark .sn-item { color: #FBFAF6; }
#side-nav.on-dark:not(.is-open) .sn-dot { box-shadow: 0 0 10px rgba(0,26,79,.9); }
.sn-item:hover { color: #006FC9; }
#side-nav.on-dark .sn-item:hover { color: #FBFAF6; }

.sn-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: .5;
  flex-shrink: 0;
  transition: opacity 400ms ease, transform 500ms cubic-bezier(.16,1,.3,1);
}
.sn-item:hover .sn-dot { opacity: 1; transform: scale(1.6); }
.sn-item.is-current .sn-dot { opacity: 1; transform: scale(1.5); }

.sn-label {
  font-family: Manrope, sans-serif;
  font-weight: 400;
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  white-space: nowrap;
  opacity: 0;
  max-width: 0;
  overflow: hidden;
  transform: translateX(-8px);
  transition: opacity 500ms ease,
              max-width 700ms cubic-bezier(.19,1,.22,1),
              transform 700ms cubic-bezier(.19,1,.22,1);
}
#side-nav.is-open .sn-label { opacity: .55; max-width: 260px; transform: none; }
#side-nav.is-open .sn-item:hover .sn-label,
#side-nav.is-open .sn-item.is-current .sn-label { opacity: 1; }

/* Conversemos — último ítem destacado */
.sn-cta { margin-left: 8px; padding-left: 16px; border-left: 1px solid rgba(0,26,79,.16); }
#side-nav.on-dark .sn-cta { border-left-color: rgba(251,250,246,.22); }
.sn-cta .sn-dot { background: #FFB900; opacity: 1; }
.sn-cta:hover .sn-dot { transform: scale(1.7); }
.sn-cta .sn-label { font-weight: 600; }
#side-nav.is-open .sn-cta .sn-label { opacity: 1; }

/* Teclado: abrir al enfocar cualquier ítem */
#side-nav:focus-within { padding: 12px 22px; background: rgba(251,250,246,.5); -webkit-backdrop-filter: blur(20px) saturate(180%); backdrop-filter: blur(20px) saturate(180%); border-color: rgba(0,26,79,.14); }
#side-nav:focus-within .sn-label { opacity: .55; max-width: 260px; transform: none; }

/* Pantallas angostas: la barra abierta cae como panel vertical */
@media (max-width: 860px) {
  #side-nav.is-open,
  #side-nav:focus-within {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 18px;
    border-radius: 22px;
  }
  #side-nav.is-open .sn-item,
  #side-nav:focus-within .sn-item { padding: 6px 0; }
  #side-nav.is-open .sn-cta,
  #side-nav:focus-within .sn-cta {
    margin: 6px 0 0;
    padding: 12px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(0,26,79,.16);
  }
  #side-nav.on-dark.is-open .sn-cta { border-top-color: rgba(251,250,246,.22); }
}
@media (max-width: 720px) {
  #side-nav { left: 10px; top: 10px; gap: 0; padding: 8px 10px; }
  .sn-item { padding: 4px 7px; }
}

/* Mosaico fotográfico de los principios: sin marcos, separado solo por aire */
.principios-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(min(100%, 260px), 1fr));
  gap: clamp(10px, 1.4vw, 18px);
}
.principio-card {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 4px;
  min-height: clamp(340px, 40vw, 520px);
  /* Fondo de marca: se ve bien aunque la foto aún no exista */
  background: linear-gradient(150deg, #001A4F 0%, #063a86 55%, #006FC9 100%);
  color: #FBFAF6;
  isolation: isolate;
}
.principio-card .principio-foto {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  transition: transform 900ms cubic-bezier(.16,1,.3,1), filter 700ms ease;
}
/* Degradado que arranca tarde: se ve más foto, el texto sigue legible */
.principio-card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(0,26,79,0) 0%, rgba(0,26,79,.06) 38%, rgba(0,26,79,.55) 70%, rgba(0,26,79,.92) 100%);
}
.principio-card .principio-texto {
  position: relative;
  z-index: 2;
  height: 100%;
  min-height: inherit;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 10px;
  padding: clamp(24px, 3vw, 40px);
}
.principio-card h3 { color: #FBFAF6; }
.principio-card p { color: rgba(251,250,246,.86) !important; }
.principio-card:hover .principio-foto { transform: scale(1.05); }

@media (prefers-reduced-motion: reduce) {
  .principio-card .principio-foto { transition: none; }
}

.nav-link { transition: opacity 400ms ease; }
.nav-link:hover { opacity: 1 !important; }

[data-page] { display: none; }
[data-page].is-active { display: block; }

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes node-in { from { opacity: 0; transform: scale(.3); } to { opacity: 1; transform: scale(1); } }
@keyframes edge-draw { to { stroke-dashoffset: 0; opacity: 1; } }

.badge-spin { animation: spin 16s linear infinite; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .badge-spin, [data-network] * { animation: none !important; }
  #side-nav, .sn-label, .sn-dot { transition: none !important; }
}

/* Cursos — acordeón de rutas y talleres */
.curso-ruta { border-top: 1px solid rgba(0,26,79,.25); }
.curso-taller { border-top: 1px solid rgba(0,26,79,.15); }
.curso-ruta > summary,
.curso-taller > summary {
  cursor: pointer;
  list-style: none;
}
.curso-ruta > summary::-webkit-details-marker,
.curso-taller > summary::-webkit-details-marker { display: none; }
.curso-ruta > summary::marker,
.curso-taller > summary::marker { content: ''; }
.curso-chevron { transition: transform 260ms cubic-bezier(.16,1,.3,1); flex-shrink: 0; }
.curso-ruta[open] > summary .curso-chevron,
.curso-taller[open] > summary .curso-chevron { transform: rotate(180deg); }
.curso-talleres-list { display: flex; flex-direction: column; }

/* Soluciones — fichas compactas en acordeón */
.sol-ficha > summary { cursor: pointer; list-style: none; }
.sol-ficha > summary::-webkit-details-marker { display: none; }
.sol-ficha > summary::marker { content: ''; }
.sol-ficha[open] > summary .curso-chevron { transform: rotate(180deg); }