/**
 * UniStudy — unified glass preloader (CSS-only, no legacy Lottie/GIF)
 */

:root {
  --uni-preloader-blue: #2563eb;
  --uni-preloader-blue-dark: #1d4ed8;
  --uni-preloader-green: #10b981;
  --uni-preloader-green-dark: #059669;
  --uni-preloader-org: #0d9488;
  --uni-preloader-org-dark: #115e59;
}

.dataTables_processing {
  display: none !important;
}

.uni-preloader {
  position: fixed;
  inset: 0;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right))
    max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  pointer-events: all;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.uni-preloader.is-visible {
  opacity: 1;
  visibility: visible;
}

.uni-preloader.is-hiding {
  opacity: 0;
  visibility: hidden;
}

.uni-preloader__backdrop {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(37, 99, 235, 0.18), transparent 70%),
    radial-gradient(ellipse 70% 50% at 80% 100%, rgba(16, 185, 129, 0.14), transparent 65%),
    rgba(248, 250, 252, 0.88);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
}

html[data-theme="dark"] .uni-preloader__backdrop {
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(37, 99, 235, 0.25), transparent 70%),
    radial-gradient(ellipse 70% 50% at 80% 100%, rgba(16, 185, 129, 0.18), transparent 65%),
    rgba(15, 23, 42, 0.9);
}

.uni-preloader--org .uni-preloader__backdrop {
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(13, 148, 136, 0.2), transparent 70%),
    radial-gradient(ellipse 70% 50% at 80% 100%, rgba(17, 94, 89, 0.12), transparent 65%),
    rgba(248, 250, 252, 0.88);
}

html[data-theme="dark"] .uni-preloader--org .uni-preloader__backdrop {
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(13, 148, 136, 0.28), transparent 70%),
    rgba(15, 23, 42, 0.92);
}

.uni-preloader__card {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.875rem;
  width: min(280px, 88vw);
  padding: clamp(1.5rem, 4vw, 2rem) clamp(1.25rem, 3vw, 1.75rem);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 1.5rem;
  box-shadow:
    0 4px 6px rgba(15, 23, 42, 0.04),
    0 20px 50px -12px rgba(37, 99, 235, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transform: scale(0.96);
  transition: transform 0.45s cubic-bezier(0.34, 1.4, 0.64, 1);
}

.uni-preloader__card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.45), rgba(16, 185, 129, 0.45));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.uni-preloader.is-visible .uni-preloader__card {
  transform: scale(1);
}

html[data-theme="dark"] .uni-preloader__card {
  background: rgba(30, 41, 59, 0.9);
  border-color: rgba(148, 163, 184, 0.12);
  box-shadow: 0 20px 50px -12px rgba(0, 0, 0, 0.45);
}

.uni-preloader--auth .uni-preloader__card {
  width: min(240px, 82vw);
  padding: 1.25rem 1.5rem;
  gap: 0.625rem;
}

.uni-preloader--auth .uni-preloader__dots {
  display: none;
}

/* Brand logo in preloader uses .uni-brand-logo--preloader (see uni-brand-logo.css) */
.uni-preloader__card > .uni-brand-logo--preloader {
  flex-shrink: 0;
}

.uni-preloader__spinner {
  position: relative;
  width: 72px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.uni-preloader--auth .uni-preloader__spinner {
  width: 56px;
  height: 56px;
}

.uni-preloader__ring {
  position: absolute;
  border-radius: 50%;
  border: 3px solid transparent;
}

.uni-preloader__ring--outer {
  inset: 0;
  border-top-color: var(--uni-preloader-blue);
  border-right-color: var(--uni-preloader-green);
  animation: uni-preloader-spin 1s linear infinite;
}

.uni-preloader__ring--inner {
  inset: 12px;
  border-bottom-color: var(--uni-preloader-green);
  border-left-color: var(--uni-preloader-blue);
  animation: uni-preloader-spin 0.75s linear infinite reverse;
}

.uni-preloader--org .uni-preloader__ring--outer {
  border-top-color: var(--uni-preloader-org);
  border-right-color: var(--uni-preloader-org-dark);
}

.uni-preloader--org .uni-preloader__ring--inner {
  border-bottom-color: var(--uni-preloader-org-dark);
  border-left-color: var(--uni-preloader-org);
}

.uni-preloader__core {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--uni-preloader-blue), var(--uni-preloader-green));
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.5);
  animation: uni-preloader-core-pulse 1.2s ease-in-out infinite;
}

.uni-preloader--org .uni-preloader__core {
  background: linear-gradient(135deg, var(--uni-preloader-org), var(--uni-preloader-org-dark));
  box-shadow: 0 0 12px rgba(13, 148, 136, 0.45);
}

.uni-preloader__text {
  margin: 0;
  font-size: clamp(0.875rem, 2.5vw, 0.9375rem);
  font-weight: 600;
  color: #1e293b;
  text-align: center;
  line-height: 1.45;
  letter-spacing: 0.01em;
}

html[data-theme="dark"] .uni-preloader__text {
  color: #f1f5f9;
}

.uni-preloader__dots {
  display: flex;
  gap: 6px;
  align-items: center;
  justify-content: center;
}

.uni-preloader__dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--uni-preloader-blue), var(--uni-preloader-green));
  animation: uni-preloader-bounce 1.2s ease-in-out infinite;
}

.uni-preloader--org .uni-preloader__dots span {
  background: linear-gradient(135deg, var(--uni-preloader-org), var(--uni-preloader-org-dark));
}

.uni-preloader__dots span:nth-child(2) {
  animation-delay: 0.15s;
}

.uni-preloader__dots span:nth-child(3) {
  animation-delay: 0.3s;
}

.uni-preloader__progress {
  width: 100%;
  height: 4px;
  background: rgba(37, 99, 235, 0.1);
  border-radius: 999px;
  overflow: hidden;
}

.uni-preloader--org .uni-preloader__progress {
  background: rgba(13, 148, 136, 0.12);
}

.uni-preloader__progress span {
  display: block;
  height: 100%;
  width: 35%;
  background: linear-gradient(90deg, var(--uni-preloader-blue), var(--uni-preloader-green));
  border-radius: 999px;
  animation: uni-preloader-progress 1.6s ease-in-out infinite;
}

.uni-preloader--org .uni-preloader__progress span {
  background: linear-gradient(90deg, var(--uni-preloader-org), var(--uni-preloader-org-dark));
}

.uni-preloader__progress.is-complete span {
  width: 100%;
  animation: none;
  transition: width 0.35s ease;
}

@keyframes uni-preloader-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes uni-preloader-logo-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.04);
    opacity: 0.92;
  }
}

@keyframes uni-preloader-core-pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.15);
    opacity: 0.85;
  }
}

@keyframes uni-preloader-bounce {
  0%,
  80%,
  100% {
    transform: scale(0.55);
    opacity: 0.45;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes uni-preloader-progress {
  0% {
    transform: translateX(-120%);
  }
  100% {
    transform: translateX(320%);
  }
}

[dir="rtl"] .uni-preloader__progress span {
  animation-name: uni-preloader-progress-rtl;
}

@keyframes uni-preloader-progress-rtl {
  0% {
    transform: translateX(120%);
  }
  100% {
    transform: translateX(-320%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .uni-preloader__ring--outer,
  .uni-preloader__ring--inner {
    animation-duration: 1.5s;
  }

  .uni-brand-logo--preloader,
  .uni-preloader__core,
  .uni-preloader__dots span {
    animation: none;
  }

  .uni-preloader__progress span {
    animation: none;
    width: 55%;
  }

  .uni-preloader__card {
    transition: none;
  }
}

/* Legacy IDs — hide old GIF/Lottie containers if cached HTML still references them */
#gif-preloader,
#lottie-preloader,
#status {
  display: none !important;
}