/* ==========================================================================
   ACADEMIA CRISTIANA EL ROBLEDAL (ACER) — ESTILOS INSTITUCIONALES
   Estética: Académica, Elegante, Blanco Dominante (#FFFFFF) y Verde (#2E7D47)
   Geometría Estricta: Cero Bordes Redondeados (border-radius: 0px)
   ========================================================================== */

:root {
  --acer-green: #2E7D47;
  --acer-green-hover: #3B9457;
  --acer-green-soft: #F1F8F3;
  --acer-gold-accent: #E5B82B;
  --acer-white: #FFFFFF;
  --acer-gray-light: #F9FAFB;
  --acer-border: #E5E7EB;
  --acer-text: #1F2937;
  --acer-muted: #6B7280;
}

/* REGLA ESTRICTA: CERO BORDES REDONDEADOS EN TODO EL SITIO */
*,
*::before,
*::after,
button,
input,
select,
textarea,
img,
video,
div,
section,
article,
header,
footer,
nav,
span,
a {
  border-radius: 0px !important;
}

html {
  scroll-behavior: smooth;
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--acer-text);
  background-color: var(--acer-white);
}

body {
  overflow-x: hidden;
  background-color: var(--acer-white);
}

::selection {
  background-color: var(--acer-green);
  color: var(--acer-white);
}

.font-serif-institutional {
  font-family: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
}

/* ==========================================================================
   2. HEADER EN BLOQUE BLANCO SÓLIDO (NO SUPERPUESTO AL CARRUSEL)
   ========================================================================== */

#main-header {
  background-color: #FFFFFF;
  border-bottom: 1px solid var(--acer-border);
}

.nav-item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.nav-link {
  position: relative;
  height: 100%;
  display: inline-flex;
  align-items: center;
  padding: 0 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--acer-green);
  transition: color 0.2s ease, border-color 0.2s ease;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

@media (min-width: 1280px) {
  .nav-link {
    padding: 0 0.85rem;
    font-size: 0.84rem;
  }
}

.nav-link:hover,
.nav-item:hover > .nav-link {
  color: var(--acer-green-hover);
  border-bottom-color: var(--acer-green-hover);
}

.nav-link.active {
  color: var(--acer-green);
  border-bottom-color: var(--acer-gold-accent);
}
/* Menú Desplegable Limpio en Hover */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 230px;
  background-color: var(--acer-white);
  border: 1px solid var(--acer-border);
  border-top: 2px solid var(--acer-gold-accent);
  box-shadow: 0 14px 28px -8px rgba(0, 0, 0, 0.14);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  z-index: 100;
}

.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: block;
  padding: 0.85rem 1.2rem;
  font-size: 0.83rem;
  font-weight: 500;
  color: #1F2937;
  border-bottom: 1px solid #F3F4F6;
  transition: background-color 0.15s ease, color 0.15s ease, padding-left 0.15s ease;
}

.dropdown-link:last-child {
  border-bottom: none;
}

.dropdown-link:hover {
  background-color: var(--acer-green-soft);
  color: var(--acer-green);
  padding-left: 1.45rem;
}

/* ==========================================================================
   3. CARRUSEL MOSAICO DENSO (COLUMNAS SIMPLES + COLUMNAS APILADAS, GAP-0)
   ========================================================================== */

.hero-strip-viewport {
  width: 100%;
  overflow: hidden;
  position: relative;
  background-color: #FFFFFF;
}

.hero-strip-track {
  display: flex;
  flex-direction: row;
  gap: 0;
  height: 440px;
  will-change: transform;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

@media (min-width: 1024px) {
  .hero-strip-track { height: 480px; }
}

.mosaic-col {
  flex: 0 0 50%;
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow: hidden;
}

@media (min-width: 640px)  { .mosaic-col { flex-basis: 33.3333%; } }
@media (min-width: 1024px) { .mosaic-col { flex-basis: 20%; } }
@media (min-width: 1280px) { .mosaic-col { flex-basis: 14.2857%; } }

.mosaic-cell {
  flex: 1 1 0;
  min-height: 0;
  overflow: hidden;
}

.mosaic-cell img,
.mosaic-cell video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.7);
  color: #1F2937;
  transition: background-color 0.2s ease;
}

.hero-arrow:hover { background-color: rgba(255, 255, 255, 0.95); }
/* ==========================================================================
   4. TARJETAS DE NIVELES EDUCATIVOS (SPLIT 50/50)
   ========================================================================== */

.level-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--acer-white);
  border: 1px solid var(--acer-border);
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
}

.level-card:hover {
  border-color: var(--acer-green);
  background-color: var(--acer-green-soft);
}

.level-card:hover .level-card-title {
  color: var(--acer-green);
}

.level-card:hover .level-card-arrow {
  color: var(--acer-green);
  transform: translateX(4px);
}

.level-card-arrow {
  transition: transform 0.2s ease, color 0.2s ease;
}

/* ==========================================================================
   5. BOTONES PLANOS Y FORMULARIOS RECTOS
   ========================================================================== */

.btn-green {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--acer-green);
  color: var(--acer-white);
  font-weight: 600;
  font-size: 0.83rem;
  letter-spacing: 0.03em;
  padding: 0.85rem 1.6rem;
  border: 1px solid var(--acer-green);
  transition: background-color 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
}

.btn-green:hover {
  background-color: var(--acer-green-hover);
  border-color: var(--acer-green-hover);
}

.btn-white-solid {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: #FFFFFF;
  color: #111827;
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  padding: 0.65rem 1.25rem;
  border: 1px solid #FFFFFF;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn-white-solid:hover {
  background-color: #F3F4F6;
  color: var(--acer-green);
}

.input-clean {
  width: 100%;
  background-color: var(--acer-white);
  border: 1px solid #D1D5DB;
  padding: 0.85rem 1rem;
  font-size: 0.875rem;
  color: var(--acer-text);
  transition: border-color 0.2s ease;
  outline: none;
}

.input-clean:focus {
  border-color: var(--acer-green);
}

/* Transición suave entre vistas */
.view-section {
  animation: viewFadeIn 0.24s ease-out;
}

@keyframes viewFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}


/* ==========================================================================
   6. ANIMACIONES SUTILES PERO LLAMATIVAS
   ========================================================================== */

/* Entrada del header */
#main-header {
  animation: headerDrop 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes headerDrop {
  from { opacity: 0; transform: translateY(-14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Subrayado de pestañas que crece desde el centro */
.nav-link { border-bottom-color: transparent !important; }

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -1px;
  width: 0;
  height: 2px;
  background-color: var(--acer-green-hover);
  transform: translateX(-50%);
  transition: width 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-link:hover::after,
.nav-item:hover > .nav-link::after { width: calc(100% - 1.3rem); }

.nav-link.active::after {
  width: calc(100% - 1.3rem);
  background-color: var(--acer-gold-accent);
}

/* Mosaico: entrada escalonada de columnas + zoom suave al pasar el cursor */
.mosaic-col {
  animation: mosaicIn 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.mosaic-col:nth-child(1) { animation-delay: 0.05s; }
.mosaic-col:nth-child(2) { animation-delay: 0.12s; }
.mosaic-col:nth-child(3) { animation-delay: 0.19s; }
.mosaic-col:nth-child(4) { animation-delay: 0.26s; }
.mosaic-col:nth-child(5) { animation-delay: 0.33s; }
.mosaic-col:nth-child(6) { animation-delay: 0.40s; }
.mosaic-col:nth-child(7) { animation-delay: 0.47s; }

@keyframes mosaicIn {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.mosaic-cell img,
.mosaic-cell video {
  transition: transform 1.1s cubic-bezier(0.22, 1, 0.36, 1), filter 0.6s ease;
}

.mosaic-cell:hover img,
.mosaic-cell:hover video {
  transform: scale(1.07);
  filter: saturate(1.15);
}

/* Revelado al hacer scroll */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.85s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.85s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: var(--reveal-delay, 0s);
}

.reveal-left  { transform: translateX(-40px); }
.reveal-right { transform: translateX(40px); }

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Fotos a sangre: se descubren con una cortina verde que se desliza */
.reveal-image {
  position: relative;
  overflow: hidden;
}

.reveal-image img {
  transform: scale(1.15);
  transition: transform 1.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal-image::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--acer-green);
  transform-origin: right;
  transition: transform 1s cubic-bezier(0.77, 0, 0.18, 1);
  z-index: 2;
}

.reveal-image.is-visible img { transform: scale(1); }
.reveal-image.is-visible::after { transform: scaleX(0); }

/* Título institucional: el espaciado se cierra y la línea dorada se dibuja */
.title-animate {
  letter-spacing: 0.35em;
  opacity: 0;
  transition: letter-spacing 1.4s cubic-bezier(0.22, 1, 0.36, 1), opacity 1s ease;
}

.title-animate.is-visible {
  letter-spacing: 0.04em;
  opacity: 1;
}

.title-line {
  transform: scaleX(0);
  transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.6s;
}

.title-animate.is-visible + .title-line,
.title-line.is-visible { transform: scaleX(1); }

/* Tarjetas: elevación suave */
.lift-card {
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.35s ease, border-color 0.3s ease;
}

.lift-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 36px -14px rgba(46, 125, 71, 0.28);
  border-color: var(--acer-green);
}

.level-card { position: relative; overflow: hidden; }

.level-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--acer-green);
  transform: scaleY(0);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.level-card:hover::before { transform: scaleY(1); }

/* Botones verdes: destello diagonal al pasar el cursor */
.btn-green {
  position: relative;
  overflow: hidden;
}

.btn-green::after {
  content: "";
  position: absolute;
  top: 0;
  left: -75%;
  width: 50%;
  height: 100%;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transform: skewX(-20deg);
  transition: left 0.6s ease;
}

.btn-green:hover::after { left: 125%; }

/* Foto del split de niveles: transición suave al cambiar */
#split-campus-main-photo {
  transition: opacity 0.35s ease, transform 1.2s cubic-bezier(0.22, 1, 0.36, 1);
}

#split-campus-main-photo.is-swapping { opacity: 0.25; transform: scale(1.04); }

/* Accesibilidad: sin animaciones si el usuario lo prefiere */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .reveal, .title-animate { opacity: 1 !important; transform: none !important; letter-spacing: 0.04em !important; }
  .reveal-image::after { display: none; }
  .reveal-image img { transform: none !important; }
  .title-line { transform: none !important; }
}