/* ============================================================
   PANTALLA DE CARGA / LOADING SCREEN
============================================================ */

.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100dvw;
  height: 100dvh;
  max-width: 100%;
  max-height: 100%;
  background: linear-gradient(135deg, var(--color-fondo) 0%, var(--color-fondo-secundario) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.8s cubic-bezier(0.4, 0, 0.2, 1),
    backdrop-filter 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 1;
  visibility: visible;
  backdrop-filter: blur(0px);
}

.loading-screen.oculto {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  backdrop-filter: blur(4px);
}

/* ============================================================
   CONTENEDOR DEL SPINNER
============================================================ */
.loading-spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(2rem, 5vw, 3rem);
}

/* ============================================================
   SPINNER ANIMADO (DISEÑO MODERNO)
============================================================ */
.loading-spinner {
  width: clamp(60px, 15vw, 100px);
  height: clamp(60px, 15vw, 100px);
  position: relative;
}

/* Anillo exterior giratorio */
.loading-spinner::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid var(--color-acento-sutil);
  border-top-color: var(--color-acento);
  border-right-color: var(--color-acento);
  animation: girarSpinner 0.8s cubic-bezier(0.4, 0.15, 0.6, 0.85) infinite;
}

/* Anillo interior con rotación inversa */
.loading-spinner::after {
  content: '';
  position: absolute;
  inset: 12px;
  border-radius: 50%;
  border: 2px solid transparent;
  border-right-color: var(--color-acento);
  border-bottom-color: var(--color-acento);
  animation: girarSpinnerInverso 1.2s cubic-bezier(0.4, 0.15, 0.6, 0.85) infinite;
}

@keyframes girarSpinner {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

@keyframes girarSpinnerInverso {
  0% {
    transform: rotate(360deg);
  }

  100% {
    transform: rotate(0deg);
  }
}

/* ============================================================
   TEXTO DE CARGA
============================================================ */
.loading-texto {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.loading-titulo {
  font-family: var(--fuente-display);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  font-weight: 700;
  color: var(--color-texto-primario);
  letter-spacing: -0.02em;
  margin: 0;
}

.loading-descripcion {
  font-family: var(--fuente-cuerpo);
  font-size: clamp(0.85rem, 2vw, 1rem);
  color: var(--color-texto-secundario);
  letter-spacing: 0.02em;
  margin: 0;
  font-weight: 400;
}

/* Efecto de puntos animados */
.loading-dots {
  display: inline-block;
  width: 1em;
  overflow: hidden;
}

.loading-dots::after {
  content: '...';
  word-spacing: 0.2em;
  animation: puntosAnimacion 1.5s step-end infinite;
}

@keyframes puntosAnimacion {

  0%,
  20% {
    content: '.';
  }

  40% {
    content: '..';
  }

  60%,
  100% {
    content: '...';
  }
}

/* ============================================================
   BARRA DE PROGRESO DE CARGA
============================================================ */
.loading-progress {
  width: clamp(150px, 50vw, 300px);
  height: clamp(3px, 0.5vw, 6px);
  background: var(--color-borde);
  border-radius: 99px;
  overflow: hidden;
  margin-top: 1rem;
  display: none;
}

.loading-progress.activo {
  display: block;
}

.loading-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-acento), #8b5cf6);
  border-radius: 99px;
  width: 0%;
  animation: aumentarProgreso 2s ease-in-out forwards;
}

@keyframes aumentarProgreso {
  0% {
    width: 0%;
  }

  50% {
    width: 60%;
  }

  85% {
    width: 85%;
  }

  100% {
    width: 100%;
  }
}

/* ============================================================
   VARIANTES DE SPINNER
============================================================ */

/* Spinner minimalista (alternativo) */
.loading-spinner.minimo {
  width: clamp(50px, 12vw, 80px);
  height: clamp(50px, 12vw, 80px);
}

.loading-spinner.minimo::before {
  border-width: 2px;
}

.loading-spinner.minimo::after {
  inset: 10px;
  border-width: 2px;
}

/* ============================================================
   ANIMACIÓN DE DESAPARICIÓN SUAVE
============================================================ */
.loading-screen.fade-out {
  animation: fadeOutLoading 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeOutLoading {
  0% {
    opacity: 1;
    transform: scale(1);
  }

  100% {
    opacity: 0;
    transform: scale(1.02);
    visibility: hidden;
  }
}

/* ============================================================
   DARK MODE ADJUSTMENTS
============================================================ */
[data-tema="oscuro"] .loading-screen {
  background: linear-gradient(135deg, var(--color-fondo) 0%, var(--color-fondo-secundario) 100%);
}

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

@media (max-height: 600px) {
  .loading-spinner-container {
    gap: clamp(1.5rem, 3vw, 2rem);
  }

  .loading-titulo {
    font-size: clamp(1rem, 2.5vw, 1.6rem);
  }

  .loading-descripcion {
    font-size: clamp(0.75rem, 1.8vw, 0.9rem);
  }
}

/* Tablets */
@media (min-width: 768px) {
  .loading-spinner-container {
    gap: clamp(2.5rem, 6vw, 4rem);
  }
}

/* ============================================================
   ACCESIBILIDAD
============================================================ */
@media (prefers-reduced-motion: reduce) {

  .loading-spinner::before,
  .loading-spinner::after,
  .loading-progress-bar,
  .loading-dots::after {
    animation: none !important;
  }

  .loading-screen {
    transition: none;
  }
}

/* Preferencia de contraste alto */
@media (prefers-contrast: more) {
  .loading-spinner::before {
    border-color: var(--color-borde);
  }

  .loading-spinner::before,
  .loading-spinner::after {
    border-top-color: var(--color-acento);
    border-right-color: var(--color-acento);
  }
}