/**
 * Ultra Modern Loading Overlay System
 * Version: 1.0.0
 * Isolated and non-intrusive design
 */

/* ============================================
   CSS RESET & ISOLATION
   ============================================ */
.ulo-overlay,
.ulo-overlay *,
.ulo-overlay *::before,
.ulo-overlay *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0;
  font: inherit;
  vertical-align: baseline;
  animation: none;
  transition: none;
}

/* ============================================
   CSS CUSTOM PROPERTIES (THEMING)
   ============================================ */
:root {
  --ulo-primary-color: #6366f1;
  --ulo-success-color: #10b981;
  --ulo-error-color: #ef4444;
  --ulo-warning-color: #f59e0b;
  --ulo-info-color: #3b82f6;
  
  --ulo-bg-overlay: rgba(15, 23, 42, 0.75);
  --ulo-bg-blur: blur(8px);
  --ulo-card-bg: #ffffff;
  --ulo-card-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --ulo-text-primary: #1e293b;
  --ulo-text-secondary: #64748b;
  
  --ulo-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  --ulo-animation-duration: 0.3s;
  --ulo-spinner-size: 48px;
  --ulo-icon-size: 64px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --ulo-bg-overlay: rgba(0, 0, 0, 0.85);
    --ulo-card-bg: #1e293b;
    --ulo-card-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --ulo-text-primary: #f1f5f9;
    --ulo-text-secondary: #94a3b8;
  }
}

/* ============================================
   OVERLAY CONTAINER
   ============================================ */
.ulo-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: var(--ulo-bg-overlay);
  backdrop-filter: var(--ulo-bg-blur);
  -webkit-backdrop-filter: var(--ulo-bg-blur);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--ulo-animation-duration) var(--ulo-timing-function),
              visibility var(--ulo-animation-duration) var(--ulo-timing-function);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.ulo-overlay.ulo-active {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   LOADING CARD
   ============================================ */
.ulo-card {
  background: var(--ulo-card-bg);
  border-radius: 24px;
  padding: 48px 40px;
  box-shadow: var(--ulo-card-shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  min-width: 320px;
  max-width: 90vw;
  transform: scale(0.9) translateY(20px);
  opacity: 0;
  transition: transform var(--ulo-animation-duration) var(--ulo-timing-function),
              opacity var(--ulo-animation-duration) var(--ulo-timing-function);
}

.ulo-overlay.ulo-active .ulo-card {
  transform: scale(1) translateY(0);
  opacity: 1;
}

/* ============================================
   SPINNER ANIMATIONS
   ============================================ */
.ulo-spinner-container {
  position: relative;
  width: var(--ulo-spinner-size);
  height: var(--ulo-spinner-size);
}

/* Circular Spinner */
.ulo-spinner-circular {
  width: 100%;
  height: 100%;
  border: 3px solid rgba(99, 102, 241, 0.1);
  border-top-color: var(--ulo-primary-color);
  border-radius: 50%;
  animation: ulo-spin 0.8s linear infinite;
}

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

/* Dots Spinner */
.ulo-spinner-dots {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
}

.ulo-spinner-dots .ulo-dot {
  width: 12px;
  height: 12px;
  background: var(--ulo-primary-color);
  border-radius: 50%;
  animation: ulo-bounce 1.4s infinite ease-in-out both;
}

.ulo-spinner-dots .ulo-dot:nth-child(1) {
  animation-delay: -0.32s;
}

.ulo-spinner-dots .ulo-dot:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes ulo-bounce {
  0%, 80%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  40% {
    transform: scale(1.2);
    opacity: 1;
  }
}

/* Pulse Spinner */
.ulo-spinner-pulse {
  width: 100%;
  height: 100%;
  background: var(--ulo-primary-color);
  border-radius: 50%;
  animation: ulo-pulse 1.5s ease-in-out infinite;
}

@keyframes ulo-pulse {
  0%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  50% {
    transform: scale(1.2);
    opacity: 1;
  }
}

/* Ring Spinner */
.ulo-spinner-ring {
  width: 100%;
  height: 100%;
  position: relative;
}

.ulo-spinner-ring::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 4px solid transparent;
  border-top-color: var(--ulo-primary-color);
  border-right-color: var(--ulo-primary-color);
  border-radius: 50%;
  animation: ulo-spin 0.8s linear infinite;
}

/* Bars Spinner */
.ulo-spinner-bars {
  display: flex;
  gap: 6px;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.ulo-spinner-bars .ulo-bar {
  width: 4px;
  height: 32px;
  background: var(--ulo-primary-color);
  border-radius: 2px;
  animation: ulo-stretch 1.2s ease-in-out infinite;
}

.ulo-spinner-bars .ulo-bar:nth-child(1) {
  animation-delay: -0.4s;
}

.ulo-spinner-bars .ulo-bar:nth-child(2) {
  animation-delay: -0.3s;
}

.ulo-spinner-bars .ulo-bar:nth-child(3) {
  animation-delay: -0.2s;
}

.ulo-spinner-bars .ulo-bar:nth-child(4) {
  animation-delay: -0.1s;
}

@keyframes ulo-stretch {
  0%, 40%, 100% {
    transform: scaleY(0.6);
  }
  20% {
    transform: scaleY(1);
  }
}

/* ============================================
   STATUS ICONS
   ============================================ */
.ulo-icon-container {
  width: var(--ulo-icon-size);
  height: var(--ulo-icon-size);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: ulo-scale-in 0.4s var(--ulo-timing-function);
}

.ulo-icon-container svg {
  width: 100%;
  height: 100%;
}

/* Success Icon */
.ulo-icon-success svg {
  color: var(--ulo-success-color);
}

.ulo-icon-success .ulo-checkmark {
  stroke-dasharray: 50;
  stroke-dashoffset: 50;
  animation: ulo-draw-check 0.6s var(--ulo-timing-function) forwards;
}

@keyframes ulo-draw-check {
  to {
    stroke-dashoffset: 0;
  }
}

/* Error Icon */
.ulo-icon-error svg {
  color: var(--ulo-error-color);
}

.ulo-icon-error .ulo-cross-line {
  stroke-dasharray: 30;
  stroke-dashoffset: 30;
  animation: ulo-draw-cross 0.4s var(--ulo-timing-function) forwards;
}

.ulo-icon-error .ulo-cross-line:nth-child(2) {
  animation-delay: 0.2s;
}

@keyframes ulo-draw-cross {
  to {
    stroke-dashoffset: 0;
  }
}

/* Warning Icon */
.ulo-icon-warning svg {
  color: var(--ulo-warning-color);
}

/* Info Icon */
.ulo-icon-info svg {
  color: var(--ulo-info-color);
}

@keyframes ulo-scale-in {
  from {
    transform: scale(0);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* ============================================
   TEXT CONTENT
   ============================================ */
.ulo-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ulo-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--ulo-text-primary);
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.ulo-message {
  font-size: 14px;
  color: var(--ulo-text-secondary);
  line-height: 1.6;
  max-width: 400px;
}

/* ============================================
   PROGRESS BAR
   ============================================ */
.ulo-progress-container {
  width: 100%;
  max-width: 280px;
  height: 6px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}

.ulo-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--ulo-primary-color), #8b5cf6);
  border-radius: 999px;
  transition: width 0.3s var(--ulo-timing-function);
  position: relative;
}

.ulo-progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: ulo-shimmer 1.5s infinite;
}

@keyframes ulo-shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

.ulo-progress-text {
  font-size: 12px;
  font-weight: 600;
  color: var(--ulo-primary-color);
  margin-top: 8px;
}

/* ============================================
   BUTTON
   ============================================ */
.ulo-button {
  padding: 12px 24px;
  background: var(--ulo-primary-color);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s var(--ulo-timing-function);
  outline: none;
  font-family: inherit;
}

.ulo-button:hover {
  background: #4f46e5;
  transform: translateY(-2px);
  box-shadow: 0 10px 20px -10px rgba(99, 102, 241, 0.5);
}

.ulo-button:active {
  transform: translateY(0);
}

.ulo-button-secondary {
  background: transparent;
  color: var(--ulo-text-secondary);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.ulo-button-secondary:hover {
  background: rgba(99, 102, 241, 0.05);
  border-color: var(--ulo-primary-color);
  color: var(--ulo-primary-color);
  transform: translateY(-2px);
  box-shadow: none;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 640px) {
  .ulo-card {
    padding: 32px 24px;
    min-width: 280px;
    gap: 20px;
  }
  
  .ulo-title {
    font-size: 18px;
  }
  
  .ulo-message {
    font-size: 13px;
  }
  
  :root {
    --ulo-spinner-size: 40px;
    --ulo-icon-size: 56px;
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
.ulo-overlay[aria-hidden="true"] {
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .ulo-overlay,
  .ulo-overlay *,
  .ulo-card,
  .ulo-spinner-circular,
  .ulo-spinner-pulse,
  .ulo-spinner-ring::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.ulo-no-scroll {
  overflow: hidden !important;
}

/* Color variants */
.ulo-primary {
  --ulo-spinner-color: var(--ulo-primary-color);
}

.ulo-success {
  --ulo-spinner-color: var(--ulo-success-color);
}

.ulo-error {
  --ulo-spinner-color: var(--ulo-error-color);
}

.ulo-warning {
  --ulo-spinner-color: var(--ulo-warning-color);
}

.ulo-info {
  --ulo-spinner-color: var(--ulo-info-color);
}