/* ═══════════════════════════════════════════════════════════════════
   UpTe Loader System — Signature loading experience
   3 variants: standard, inline (button), fullscreen
   Auto-adapts to all 4 themes via CSS variables
   ═══════════════════════════════════════════════════════════════════ */

/* ─── Keyframes ─── */

@keyframes upte-pulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: .55;
    transform: scale(.92);
  }
}

@keyframes upte-bar {
  0% {
    transform: translateX(-100%);
  }

  50% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(100%);
  }
}

@keyframes upte-fadein {
  from {
    opacity: 0;
    transform: translateY(6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes upte-orbit {
  to {
    transform: rotate(360deg);
  }
}

@keyframes upte-shimmer {
  0% {
    background-position: -200% 0;
  }

  100% {
    background-position: 200% 0;
  }
}

/* ═══════════════════════════════════════════════════════════════════
   1. STANDARD  —  .upte-loader
   Used for: document loading, room list, imports, general async
   ═══════════════════════════════════════════════════════════════════ */

.upte-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 36px 20px;
  animation: upte-fadein var(--dur-slow) var(--ease-out) both;
}

/* Branded icon container */
.upte-loader__icon {
  position: relative;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Orbiting ring around the icon */
.upte-loader__icon::before {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid transparent;
  border-top-color: var(--green);
  border-right-color: var(--green-glow);
  animation: upte-orbit .9s cubic-bezier(.4, 0, .2, 1) infinite;
}

/* The mortarboard SVG pulses */
.upte-loader__icon svg {
  width: 22px;
  height: 22px;
  color: var(--green-text);
  animation: upte-pulse 1.6s ease-in-out infinite;
  flex-shrink: 0;
}

/* Progress bar track */
.upte-loader__bar {
  width: 48px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--border);
  overflow: hidden;
  position: relative;
}

/* Indeterminate shimmer */
.upte-loader__bar::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  background-size: 200% 100%;
  animation: upte-shimmer 1.4s ease-in-out infinite;
}

/* Determinate fill (set width via JS style) */
.upte-loader__bar--determinate::after {
  animation: none;
  background: var(--green);
  width: var(--progress, 0%);
  transition: width var(--dur-slow) var(--ease-out);
}

/* Text label */
.upte-loader__text {
  font-family: var(--font-body);
  font-size: 12.5px;
  color: var(--muted);
  text-align: center;
  line-height: 1.4;
}

/* ═══════════════════════════════════════════════════════════════════
   2. INLINE  —  .upte-loader--inline
   Used for: buttons, small async indicators, compact spaces
   ═══════════════════════════════════════════════════════════════════ */

.upte-loader--inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0;
  flex-direction: row;
  animation: none;
}

.upte-loader--inline .upte-loader__icon {
  width: 16px;
  height: 16px;
}

.upte-loader--inline .upte-loader__icon::before {
  inset: -2px;
  border-width: 2px;
}

.upte-loader--inline .upte-loader__icon svg {
  width: 10px;
  height: 10px;
  animation: upte-pulse 1.2s ease-in-out infinite;
}

.upte-loader--inline .upte-loader__bar {
  display: none;
}

.upte-loader--inline .upte-loader__text {
  font-size: 12px;
  color: inherit;
  
}

/* ═══════════════════════════════════════════════════════════════════
   3. FULLSCREEN  —  .upte-loader--full
   Used for: splash screen, major transitions, initial app load
   ═══════════════════════════════════════════════════════════════════ */

.upte-loader--full {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-toast) + 30);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 24px;
  animation: upte-fadein var(--dur-base) var(--ease-out) both;
  transition: opacity var(--dur-screen) var(--ease-out), transform var(--dur-screen) var(--ease-out);
}

.upte-loader--full .upte-loader__icon {
  width: 68px;
  height: 68px;
  background: var(--green3);
  border-radius: var(--radius-lg);
}

.upte-loader--full .upte-loader__icon::before {
  display: none;
}

.upte-loader--full .upte-loader__icon svg {
  width: 36px;
  height: 36px;
  color: var(--white);
  stroke: var(--white);
  animation: upte-pulse 2s ease-in-out infinite;
}

/* Brand name */
.upte-loader__brand {
  display: none;
}

.upte-loader--full .upte-loader__brand {
  display: block;
  font-family: var(--font-brand), sans-serif;
  font-weight: 800;
  font-size: 22px;
  color: var(--text);
  letter-spacing: var(--tracking-tight);
}

.upte-loader--full .upte-loader__bar {
  width: 32px;
}

.upte-loader--full .upte-loader__text {
  font-size: 13px;
  color: var(--muted2);
  max-width: 240px;
}

/* Ecran de demarrage (DESIGN.md, section Marque) : --brand plein jusqu'aux
   bords (le vert de la marque, constant dans les quatre themes), monogramme
   --white sans boite ni pulsation, quatre unites de marque de cote (l'encre
   y fait a peu pres la taille du splash systeme Android), mot en --white,
   barre discrete. Le meme vert et le meme monogramme que le splash natif :
   la main passe sans changement d'identite. Reserve a #splashScreen ; les
   autres chargeurs plein ecran gardent --bg. */
.upte-loader--splash {
  background: var(--brand);
  color: var(--white);
}

.upte-loader--splash .upte-loader__icon {
  width: calc(var(--brand-mark) * 4);
  height: calc(var(--brand-mark) * 4);
  background: none;
  border-radius: 0;
}

.upte-loader--splash .upte-loader__icon svg {
  width: 100%;
  height: 100%;
  animation: none;
}

.upte-loader--splash .upte-loader__brand {
  color: var(--white);
}

.upte-loader--splash .upte-loader__bar {
  background: color-mix(in srgb, var(--white) 25%, transparent);
}

.upte-loader--splash .upte-loader__bar::after {
  background: linear-gradient(90deg, transparent, var(--white), transparent);
  background-size: 200% 100%;
}

/* Fade-out utility class (applied via JS before removal) */
.upte-loader--full.upte-loader--exit {
  opacity: 0;
  transform: scale(1.02);
  pointer-events: none;
}

/* ═══════════════════════════════════════════════════════════════════
   4. COMPACT  —  .upte-loader--compact
   Used for: upload bars, page changes within docs, tight areas
   ═══════════════════════════════════════════════════════════════════ */

.upte-loader--compact {
  flex-direction: row;
  padding: 10px 14px;
  gap: 10px;
}

.upte-loader--compact .upte-loader__icon {
  width: 20px;
  height: 20px;
}

.upte-loader--compact .upte-loader__icon::before {
  inset: -3px;
  border-width: 2px;
}

.upte-loader--compact .upte-loader__icon svg {
  width: 12px;
  height: 12px;
}

.upte-loader--compact .upte-loader__bar {
  display: none;
}

.upte-loader--compact .upte-loader__text {
  font-size: 12.5px;
  color: var(--muted);
}

/* ═══════════════════════════════════════════════════════════════════
   5. SKELETON PLACEHOLDER  —  .upte-skeleton
   Used for: card placeholders, list shimmer effect
   ═══════════════════════════════════════════════════════════════════ */

.upte-skeleton {
  background: linear-gradient(90deg,
      var(--surface2) 25%,
      var(--border) 50%,
      var(--surface2) 75%);
  background-size: 200% 100%;
  animation: upte-shimmer 1.6s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.upte-skeleton--line {
  height: 12px;
  border-radius: var(--radius-sm);
}

.upte-skeleton--circle {
  border-radius: 50%;
}

/* Sur reseau lent (Afrique, mobile data) on coupe le shimmer :
   moins de repaint GPU, le placeholder reste neutre. */
html.low-bandwidth .upte-skeleton {
  animation: none;
  background: var(--surface2);
}

@media (prefers-reduced-motion: reduce) {
  .upte-skeleton {
    animation: none;
    background: var(--surface2);
  }
}

/* ═══════════════════════════════════════════════════════════════════
   6. GLASS OVERLAY  —  .upte-loader--glass
   Used for: sync, data loading — UI stays visible but blurred
   ═══════════════════════════════════════════════════════════════════ */

.upte-loader--glass {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-toast) + 20);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--overlay-scrim);
  animation: upte-glass-in var(--dur-base) var(--ease-out) both;
}

.upte-loader--glass__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 28px 36px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 40px color-mix(in srgb, var(--black) 15%, transparent), 0 0 0 1px rgba(255, 255, 255, .06);
  animation: upte-glass-card-in var(--dur-slow) var(--ease-out) both;
}

.upte-loader--glass__card .upte-loader__icon {
  width: 40px;
  height: 40px;
}

.upte-loader--glass__card .upte-loader__bar {
  width: 44px;
}

.upte-loader--glass__card .upte-loader__text {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
}

@keyframes upte-glass-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes upte-glass-card-in {
  from {
    opacity: 0;
    transform: scale(.94) translateY(8px);
  }

  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.upte-loader--glass-exit {
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
  pointer-events: none;
}

.upte-loader--glass-exit .upte-loader--glass__card {
  transform: scale(.96) translateY(-4px);
  transition: transform var(--dur-slow) var(--ease-out), opacity var(--dur-slow) var(--ease-out);
  opacity: 0;
}

/* ═══════════════════════════════════════════════════════════════════
   7. SYNC PILL  —  .upte-sync-pill
   Discreet persistent indicator for routine background sync
   (debounced cloud push, retry waits, online queue flush).
   Sits below toast container z-index so contextual alerts win.
   ═══════════════════════════════════════════════════════════════════ */

.upte-sync-pill {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--black) 12%, transparent);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  pointer-events: none;
  animation: upte-sync-pill-in var(--dur-base) var(--ease-out) both;
}

.upte-sync-pill .upte-loader__icon {
  width: 18px;
  height: 18px;
}

.upte-sync-pill .upte-loader__icon::before {
  inset: -2px;
  border-width: 1.5px;
}

.upte-sync-pill .upte-loader__icon svg {
  width: 10px;
  height: 10px;
}

.upte-sync-pill__text {
}

.upte-sync-pill--exit {
  animation: upte-sync-pill-out var(--dur-slow) var(--ease-out) forwards;
}

@keyframes upte-sync-pill-in {
  from {
    opacity: 0;
    transform: translate(-50%, 8px);
  }

  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

@keyframes upte-sync-pill-out {
  from {
    opacity: 1;
    transform: translate(-50%, 0);
  }

  to {
    opacity: 0;
    transform: translate(-50%, 8px);
  }
}

/* Sur mobile, les toasts occupent aussi le bas centre :
   on remonte le pill pour qu'ils ne se chevauchent pas. */
@media (max-width: 900px) {
  .upte-sync-pill {
    bottom: 88px;
  }
}

/* ─── Backward compat aliases (transitional) ─── */
.doc-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px;
  color: var(--muted);
  font-size: 13px;
}

.doc-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: upte-orbit .8s linear infinite;
  flex-shrink: 0;
}