/**
 * Premium page loader — viewport-centered glass card (ring + logo + name + progress).
 */

:root {
  --page-loader-ring-size: min(152px, 36vmin);
  --page-loader-ring-stroke: 4px;
  --page-loader-brand: #e5765b;
  --page-loader-accent: #f6c343;
  --page-loader-name: rgba(15, 23, 42, 0.72);
  --page-loader-z: 10050;
  /* Sidebar / bottom nav must sit above the loader for clicks and Cursor element pick */
  --page-loader-chrome-z: 10060;
  --page-loader-glass-bg: rgba(255, 255, 255, 0.42);
  --page-loader-glass-border: rgba(255, 255, 255, 0.35);
  --page-loader-glass-blur: 22px;
  --page-loader-card-bg: rgba(255, 255, 255, 0.78);
  --page-loader-card-border: rgba(255, 255, 255, 0.85);
  --page-loader-card-shadow: 0 20px 50px rgba(15, 23, 42, 0.12),
    0 4px 16px rgba(229, 118, 91, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  --page-loader-text-delay: 200ms;
  --page-loader-text-duration: 600ms;
  --page-loader-exit-duration: 300ms;
  --page-loader-reveal-duration: 420ms;
  --page-loader-reveal-offset: 10px;
}

[data-theme="dark"] {
  --page-loader-name: rgba(226, 232, 240, 0.82);
  --page-loader-glass-bg: rgba(13, 17, 23, 0.52);
  --page-loader-glass-border: rgba(255, 255, 255, 0.08);
  --page-loader-card-bg: rgba(22, 27, 34, 0.82);
  --page-loader-card-border: rgba(255, 255, 255, 0.1);
  --page-loader-card-shadow: 0 24px 56px rgba(0, 0, 0, 0.45),
    0 4px 16px rgba(229, 118, 91, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

html.page-loader-active,
html.page-loader-active body {
  overflow: hidden;
}

/* Nav chrome above loader (sidebar ~1100, header ~800, bottom nav ~90) */
body.has-client-sidebar #sidenav-main.client-sidenav,
body.has-client-sidebar .dashboard-off-canvas-menu,
body.has-client-sidebar .off--canvas-menu,
body.has-client-sidebar .header-menu-area,
.bottom-nav-wrap,
.bottom-nav__overlay,
.bottom-nav__sheet {
  z-index: var(--page-loader-chrome-z) !important;
}

#pageLoader.page-loader {
  position: fixed;
  inset: 0;
  z-index: var(--page-loader-z);
  display: grid;
  place-items: center;
  padding: max(16px, env(safe-area-inset-top, 0px))
    max(16px, env(safe-area-inset-right, 0px))
    max(16px, env(safe-area-inset-bottom, 0px))
    max(16px, env(safe-area-inset-left, 0px));
  min-height: 100vh;
  min-height: 100dvh;
  box-sizing: border-box;
  opacity: 1;
  visibility: visible;
  /* Shell does not steal picks; only the centered card blocks when loading */
  pointer-events: none;
  transition: opacity var(--page-loader-exit-duration, 300ms) ease-in,
    visibility 0s linear 0s;
}

/* Unified visibility flag — wrapper fades; inner spinner tree stays mounted */
#pageLoader.page-loader[data-loading="false"]:not(.page-loader--exiting) {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--page-loader-exit-duration, 300ms) ease-in,
    visibility 0s linear var(--page-loader-exit-duration, 300ms);
}

/* Fully removed from hit-testing so devtools / Cursor pick the page underneath */
#pageLoader.page-loader--done,
#pageLoader.page-loader[hidden],
#pageLoader.page-loader[data-loading="false"]:not(.page-loader--exiting) {
  display: none !important;
  pointer-events: none !important;
}

/* Dev / inspect: let clicks and element pickers pass through the overlay */
#pageLoader.page-loader--inspect-passthrough {
  pointer-events: none !important;
  opacity: 0.15;
}

#pageLoader.page-loader--inspect-passthrough .page-loader__backdrop,
#pageLoader.page-loader--inspect-passthrough .page-loader__card {
  pointer-events: none !important;
}

/* Route continuation: skip entrance re-init (no double loader) */
#pageLoader.page-loader--continuation .page-loader__backdrop,
#pageLoader.page-loader--continuation .page-loader__card,
#pageLoader.page-loader--continuation .page-loader__logo {
  animation: none !important;
}

#pageLoader.page-loader--continuation .page-loader__backdrop {
  opacity: 1;
}

#pageLoader.page-loader--continuation .page-loader__name {
  opacity: 1;
  transform: translateY(0);
  transition: none;
}

#pageLoader.page-loader--continuation .page-loader__progress {
  opacity: 1;
  transform: translateY(0);
  transition: none;
}

/* Glassmorphism fullscreen layer (visual only — picks pass through to nav chrome) */
.page-loader__backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--page-loader-glass-bg);
  border: 1px solid var(--page-loader-glass-border);
  backdrop-filter: blur(var(--page-loader-glass-blur)) saturate(1.65);
  -webkit-backdrop-filter: blur(var(--page-loader-glass-blur)) saturate(1.65);
  animation: page-loader-backdrop-in 0.32s ease-out both;
  pointer-events: none;
  transition: opacity var(--page-loader-exit-duration) ease-in,
    backdrop-filter var(--page-loader-exit-duration) ease-in,
    -webkit-backdrop-filter var(--page-loader-exit-duration) ease-in;
}

.page-loader__backdrop::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    165deg,
    rgba(255, 255, 255, 0.28) 0%,
    rgba(255, 255, 255, 0.06) 42%,
    rgba(229, 118, 91, 0.06) 100%
  );
  pointer-events: none;
  transition: opacity var(--page-loader-exit-duration) ease-in;
}

[data-theme="dark"] .page-loader__backdrop::before {
  background: linear-gradient(
    165deg,
    rgba(255, 255, 255, 0.06) 0%,
    rgba(255, 255, 255, 0.02) 45%,
    rgba(229, 118, 91, 0.08) 100%
  );
}

.page-loader__card {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: min(92vw, 320px);
  max-width: 100%;
  margin: 0;
  padding: 26px 28px 22px;
  box-sizing: border-box;
  border-radius: 22px;
  background: var(--page-loader-card-bg);
  border: 1px solid var(--page-loader-card-border);
  box-shadow: var(--page-loader-card-shadow);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  transform: scale(1);
  opacity: 1;
  animation: page-loader-card-in 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.05s;
  transition: transform var(--page-loader-exit-duration) ease-in,
    opacity var(--page-loader-exit-duration) ease-in;
}

.page-loader__stage {
  position: relative;
  width: var(--page-loader-ring-size);
  height: var(--page-loader-ring-size);
  flex-shrink: 0;
  display: grid;
  place-items: center;
}

.page-loader__ring {
  position: absolute;
  inset: 0;
  margin: 0;
  border-radius: 50%;
  pointer-events: none;
}

.page-loader__ring::before,
.page-loader__ring::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-sizing: border-box;
}

.page-loader__ring::before {
  padding: var(--page-loader-ring-stroke);
  background: conic-gradient(
    from 0deg,
    var(--page-loader-brand) 0deg,
    var(--page-loader-accent) 95deg,
    rgba(229, 118, 91, 0.2) 210deg,
    transparent 300deg,
    var(--page-loader-brand) 360deg
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: page-loader-ring-spin 1.1s linear infinite;
  filter: drop-shadow(0 6px 20px rgba(229, 118, 91, 0.2));
}

.page-loader__ring::after {
  inset: calc(var(--page-loader-ring-stroke) + 5px);
  border: 2px solid rgba(229, 118, 91, 0.14);
  animation: page-loader-ring-pulse 1.6s ease-in-out infinite;
}

.page-loader__logo {
  position: relative;
  z-index: 1;
  display: block;
  width: auto;
  max-width: 58%;
  height: auto;
  max-height: 58%;
  object-fit: contain;
  animation: page-loader-logo-in 0.55s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: 0.1s;
}

/* Brand text: hidden until 200ms after init, then 600ms fade-in-up */
.page-loader__name {
  margin: 14px 0 0;
  padding: 0 4px;
  max-width: 100%;
  text-align: center;
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
  font-size: clamp(0.75rem, 2.5vmin, 0.95rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--page-loader-name);
  opacity: 0;
  transform: translateY(10px);
  will-change: opacity, transform;
}

#pageLoader.page-loader--text-ready .page-loader__name {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--page-loader-text-duration) ease-out,
    transform var(--page-loader-text-duration) ease-out;
}

/* Progress indicator */
.page-loader__progress {
  width: 100%;
  margin-top: 16px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.35s ease-out 0.35s, transform 0.35s ease-out 0.35s;
}

#pageLoader.page-loader--text-ready .page-loader__progress {
  opacity: 1;
  transform: translateY(0);
}

.page-loader__progress-track {
  width: 100%;
  height: 4px;
  border-radius: 999px;
  background: rgba(229, 118, 91, 0.12);
  overflow: hidden;
}

[data-theme="dark"] .page-loader__progress-track {
  background: rgba(255, 255, 255, 0.1);
}

.page-loader__progress-bar {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(
    90deg,
    var(--page-loader-brand),
    var(--page-loader-accent)
  );
  transition: width 0.22s ease-out;
  box-shadow: 0 0 12px rgba(229, 118, 91, 0.35);
  will-change: width;
}

#pageLoader.page-loader--complete .page-loader__progress-bar {
  transition: width 0.2s ease-out;
}

/* Exit: card scales down + fades; backdrop un-blurs to reveal dashboard */
#pageLoader.page-loader--exiting {
  pointer-events: none;
}

#pageLoader.page-loader--exiting .page-loader__card {
  opacity: 0;
  transform: scale(0.95);
}

#pageLoader.page-loader--exiting .page-loader__backdrop {
  opacity: 0;
  backdrop-filter: blur(0) saturate(1);
  -webkit-backdrop-filter: blur(0) saturate(1);
}

#pageLoader.page-loader--exiting .page-loader__backdrop::before {
  opacity: 0;
}

/* Page content reveal after navigation completes */
html.page-loader-reveal-pending body.has-client-sidebar .dashboard-content-wrap,
html.page-loader-reveal-pending body.has-client-sidebar .student-dashboard,
html.page-loader-reveal-pending .dashboard-area,
html.page-loader-reveal-pending main.admin-main,
html.page-loader-reveal-pending .section-block-wrap {
  opacity: 0;
  transform: translateY(var(--page-loader-reveal-offset));
}

html.page-loader-reveal-ready body.has-client-sidebar .dashboard-content-wrap,
html.page-loader-reveal-ready body.has-client-sidebar .student-dashboard,
html.page-loader-reveal-ready .dashboard-area,
html.page-loader-reveal-ready main.admin-main,
html.page-loader-reveal-ready .section-block-wrap {
  opacity: 1;
  transform: translateY(0);
  transition: opacity var(--page-loader-reveal-duration) ease-out,
    transform var(--page-loader-reveal-duration) ease-out;
}

@keyframes page-loader-backdrop-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes page-loader-card-in {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes page-loader-logo-in {
  from {
    opacity: 0;
    transform: scale(0.88);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes page-loader-ring-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes page-loader-ring-pulse {
  0%,
  100% {
    opacity: 0.5;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.015);
  }
}

@media (max-width: 380px) {
  .page-loader__card {
    padding: 22px 20px 18px;
    width: min(94vw, 300px);
  }

  .page-loader__name {
    margin-top: 12px;
    letter-spacing: 0.03em;
  }

  .page-loader__progress {
    margin-top: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-loader__backdrop,
  .page-loader__card,
  .page-loader__logo,
  .page-loader__name,
  .page-loader__progress {
    animation-duration: 0.01ms !important;
    animation-delay: 0s !important;
    transition-duration: 0.01ms !important;
  }

  html.page-loader-reveal-pending body.has-client-sidebar .dashboard-content-wrap,
  html.page-loader-reveal-pending body.has-client-sidebar .student-dashboard,
  html.page-loader-reveal-pending .dashboard-area,
  html.page-loader-reveal-pending main.admin-main,
  html.page-loader-reveal-pending .section-block-wrap {
    opacity: 0;
    transform: none;
  }

  html.page-loader-reveal-ready body.has-client-sidebar .dashboard-content-wrap,
  html.page-loader-reveal-ready body.has-client-sidebar .student-dashboard,
  html.page-loader-reveal-ready .dashboard-area,
  html.page-loader-reveal-ready main.admin-main,
  html.page-loader-reveal-ready .section-block-wrap {
    opacity: 1;
    transform: none;
    transition-duration: 0.01ms !important;
  }

  #pageLoader.page-loader--text-ready .page-loader__name {
    opacity: 1;
    transform: none;
  }

  .page-loader__ring::before,
  .page-loader__ring::after {
    animation: none !important;
  }
}