/**
 * Page navigation loader — glass card, SVG arc sweep, indeterminate bar.
 * Tuned for 400ms–3s route changes (sidebar / Turbo navigation).
 */

.lms-page-loading {
  position: fixed;
  top: 4rem;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 45;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(37, 99, 235, 0.07), transparent 70%),
    rgba(6, 10, 18, 0.48);
  backdrop-filter: blur(6px) saturate(1.15);
  -webkit-backdrop-filter: blur(6px) saturate(1.15);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.28s ease;
}

.lms-page-loading[hidden],
.lms-page-loading:not(.is-active) {
  display: none !important;
  pointer-events: none !important;
  opacity: 0 !important;
}

.lms-page-loading.is-active {
  display: flex;
  opacity: 1;
  /* Never steal clicks — a stuck loader must not block lead/row navigation. */
  pointer-events: none;
}

.lms-page-loading.is-active[hidden] {
  display: none !important;
  pointer-events: none !important;
}

@media (min-width: 1024px) {
  .lms-page-loading {
    left: 16rem;
  }
}

.lms-page-loading__panel {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  width: min(15rem, 100%);
  padding: 1.65rem 1.75rem 1.45rem;
  border-radius: 1.35rem;
  background: linear-gradient(
    155deg,
    rgba(30, 41, 59, 0.72) 0%,
    rgba(15, 23, 42, 0.82) 100%
  );
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.04) inset,
    0 28px 60px rgba(0, 0, 0, 0.42),
    0 0 0 0.5px rgba(148, 163, 184, 0.12);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  text-align: center;
  transform: translateY(10px) scale(0.97);
  opacity: 0;
}

.lms-page-loading__panel::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(
    135deg,
    rgba(96, 165, 250, 0.45),
    rgba(255, 255, 255, 0.05) 40%,
    rgba(96, 165, 250, 0.2) 100%
  );
  -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;
  opacity: 0.65;
}

.lms-page-loading.is-active .lms-page-loading__panel {
  animation: lms-page-loading-enter 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.lms-page-loading__stage {
  position: relative;
  width: 3.25rem;
  height: 3.25rem;
}

.lms-page-loading__stage::before {
  content: '';
  position: absolute;
  inset: 0.15rem;
  border-radius: 9999px;
  background: radial-gradient(circle, rgba(96, 165, 250, 0.28) 0%, transparent 72%);
  filter: blur(6px);
  animation: lms-page-loading-breathe 2.4s ease-in-out infinite;
}

.lms-page-loading__svg {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
}

.lms-page-loading__track {
  fill: none;
  stroke: rgba(148, 163, 184, 0.16);
  stroke-width: 3;
}

.lms-page-loading__arc {
  fill: none;
  stroke: url(#lmsPageLoadGrad);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 42 84;
  transform-origin: 24px 24px;
  animation: lms-page-loading-arc 1.35s cubic-bezier(0.45, 0.05, 0.2, 1) infinite;
}

.lms-page-loading__bar {
  width: 7.25rem;
  height: 3px;
  border-radius: 9999px;
  background: rgba(148, 163, 184, 0.14);
  overflow: hidden;
}

.lms-page-loading__bar span {
  display: block;
  width: 42%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--cui-accent, #60a5fa) 48%,
    rgba(147, 197, 253, 0.95) 52%,
    transparent 100%
  );
  animation: lms-page-loading-slide 1.25s ease-in-out infinite;
}

.lms-page-loading__text {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: rgba(226, 232, 240, 0.92);
}

html[data-theme="light"] .lms-page-loading {
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(37, 99, 235, 0.05), transparent 70%),
    rgba(241, 245, 249, 0.88);
}

html[data-theme="light"] .lms-page-loading__panel {
  background: linear-gradient(
    155deg,
    rgba(255, 255, 255, 0.88) 0%,
    rgba(248, 250, 252, 0.82) 100%
  );
  border-color: rgba(255, 255, 255, 0.65);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.95) inset,
    0 22px 48px rgba(15, 23, 42, 0.1);
}

html[data-theme="light"] .lms-page-loading__text {
  color: #475569;
}

html[data-theme="light"] .lms-page-loading__track {
  stroke: rgba(100, 116, 139, 0.18);
}

@keyframes lms-page-loading-enter {
  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

@keyframes lms-page-loading-arc {
  0% {
    transform: rotate(-90deg);
    stroke-dashoffset: 0;
  }
  50% {
    stroke-dashoffset: -28;
  }
  100% {
    transform: rotate(270deg);
    stroke-dashoffset: 0;
  }
}

@keyframes lms-page-loading-slide {
  0% {
    transform: translateX(-120%);
  }
  100% {
    transform: translateX(280%);
  }
}

@keyframes lms-page-loading-breathe {
  0%, 100% {
    opacity: 0.45;
    transform: scale(0.92);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
}

@media (prefers-reduced-motion: reduce) {
  .lms-page-loading {
    transition: none;
  }

  .lms-page-loading__panel {
    transform: none;
    opacity: 1;
    animation: none;
  }

  .lms-page-loading__stage::before,
  .lms-page-loading__arc,
  .lms-page-loading__bar span {
    animation: none;
  }

  .lms-page-loading__arc {
    stroke-dasharray: none;
    stroke-dashoffset: 0;
    transform: rotate(-90deg);
    opacity: 0.85;
  }

  .lms-page-loading__bar span {
    width: 55%;
    margin: 0 auto;
    transform: none;
    opacity: 0.75;
  }
}