/**
 * SIMPLE LOADER - Styles
 * Mobile-first, lightweight, and beautiful
 */

:root {
  --loader-color: #3498db;
  --loader-size: 48px;
  --loader-speed: 1s;
}

/* Reset and base styles */
.simple-loader,
.simple-loader *,
.simple-loader *::before,
.simple-loader *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Loader container */
.simple-loader {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 9999;
  pointer-events: none;
}

.simple-loader-content {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ========================================
   SPINNER LOADER
   ======================================== */
.simple-loader-spinner .spinner {
  width: var(--loader-size);
  height: var(--loader-size);
  border: 4px solid transparent;
  border-top: 4px solid var(--loader-color);
  border-right: 4px solid var(--loader-color);
  border-radius: 50%;
  animation: spinner-rotate var(--loader-speed) linear infinite;
  will-change: transform;
  background: transparent;
}

@keyframes spinner-rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* ========================================
   DOTS LOADER
   ======================================== */
.simple-loader-dots .dots {
  display: flex;
  align-items: center;
  gap: calc(var(--loader-size) * 0.2);
}

.simple-loader-dots .dot {
  width: calc(var(--loader-size) * 0.25);
  height: calc(var(--loader-size) * 0.25);
  background: var(--loader-color);
  border-radius: 50%;
  animation: dots-bounce var(--loader-speed) ease-in-out infinite;
  will-change: transform;
}

.simple-loader-dots .dot:nth-child(1) {
  animation-delay: 0s;
}

.simple-loader-dots .dot:nth-child(2) {
  animation-delay: calc(var(--loader-speed) * 0.15);
}

.simple-loader-dots .dot:nth-child(3) {
  animation-delay: calc(var(--loader-speed) * 0.3);
}

@keyframes dots-bounce {
  0%, 80%, 100% {
    transform: scale(0.8) translateY(0);
    opacity: 0.6;
  }
  40% {
    transform: scale(1.2) translateY(-10px);
    opacity: 1;
  }
}

/* ========================================
   PULSE LOADER
   ======================================== */
.simple-loader-pulse .pulse {
  width: var(--loader-size);
  height: var(--loader-size);
  background: var(--loader-color);
  border-radius: 50%;
  animation: pulse-scale var(--loader-speed) ease-in-out infinite;
  will-change: transform, opacity;
  position: relative;
}

.simple-loader-pulse .pulse::before,
.simple-loader-pulse .pulse::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--loader-color);
  border-radius: 50%;
  animation: pulse-ripple calc(var(--loader-speed) * 2) ease-out infinite;
  will-change: transform, opacity;
}

.simple-loader-pulse .pulse::after {
  animation-delay: calc(var(--loader-speed) * 0.5);
}

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

@keyframes pulse-ripple {
  0% {
    transform: scale(1);
    opacity: 0.6;
  }
  100% {
    transform: scale(2);
    opacity: 0;
  }
}

/* ========================================
   BAR LOADER
   ======================================== */
.simple-loader-bar .bar {
  width: calc(var(--loader-size) * 2.5);
  height: calc(var(--loader-size) * 0.15);
  background: rgba(0, 0, 0, 0.1);
  border-radius: calc(var(--loader-size) * 0.075);
  overflow: hidden;
  position: relative;
}

.simple-loader-bar .bar-inner {
  height: 100%;
  background: var(--loader-color);
  border-radius: calc(var(--loader-size) * 0.075);
  animation: bar-slide var(--loader-speed) ease-in-out infinite;
  will-change: transform;
  box-shadow: 0 0 10px var(--loader-color);
}

@keyframes bar-slide {
  0% {
    transform: translateX(-100%);
  }
  50% {
    transform: translateX(0%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* ========================================
   WAVE LOADER
   ======================================== */
.simple-loader-wave .wave {
  display: flex;
  align-items: flex-end;
  gap: calc(var(--loader-size) * 0.1);
  height: var(--loader-size);
}

.simple-loader-wave .wave-bar {
  width: calc(var(--loader-size) * 0.15);
  background: var(--loader-color);
  border-radius: calc(var(--loader-size) * 0.075);
  animation: wave-bounce var(--loader-speed) ease-in-out infinite;
  will-change: height;
}

.simple-loader-wave .wave-bar:nth-child(1) {
  animation-delay: 0s;
}

.simple-loader-wave .wave-bar:nth-child(2) {
  animation-delay: calc(var(--loader-speed) * 0.1);
}

.simple-loader-wave .wave-bar:nth-child(3) {
  animation-delay: calc(var(--loader-speed) * 0.2);
}

.simple-loader-wave .wave-bar:nth-child(4) {
  animation-delay: calc(var(--loader-speed) * 0.3);
}

.simple-loader-wave .wave-bar:nth-child(5) {
  animation-delay: calc(var(--loader-speed) * 0.4);
}

@keyframes wave-bounce {
  0%, 100% {
    height: 30%;
  }
  50% {
    height: 100%;
  }
}

/* ========================================
   BOUNCE LOADER
   ======================================== */
.simple-loader-bounce .bounce {
  width: var(--loader-size);
  height: var(--loader-size);
  background: var(--loader-color);
  border-radius: 50%;
  animation: bounce-animation calc(var(--loader-speed) * 1.2) cubic-bezier(0.28, 0.84, 0.42, 1) infinite;
  will-change: transform;
}

@keyframes bounce-animation {
  0%, 100% {
    transform: translateY(0) scale(1, 1);
  }
  25% {
    transform: translateY(-40px) scale(1.1, 0.9);
  }
  50% {
    transform: translateY(0) scale(1, 1);
  }
  75% {
    transform: translateY(-20px) scale(1.05, 0.95);
  }
}

/* ========================================
   RING LOADER
   ======================================== */
.simple-loader-ring .ring {
  width: var(--loader-size);
  height: var(--loader-size);
  border-radius: 50%;
  position: relative;
}

.simple-loader-ring .ring::before,
.simple-loader-ring .ring::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 4px solid transparent;
  border-top-color: var(--loader-color);
  animation: ring-rotate var(--loader-speed) linear infinite;
  will-change: transform;
}

.simple-loader-ring .ring::after {
  border-top-color: transparent;
  border-bottom-color: var(--loader-color);
  animation-direction: reverse;
  animation-duration: calc(var(--loader-speed) * 1.5);
}

@keyframes ring-rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* ========================================
   HEARTBEAT LOADER
   ======================================== */
.simple-loader-heartbeat .heartbeat {
  width: var(--loader-size);
  height: var(--loader-size);
  background: var(--loader-color);
  border-radius: 50%;
  animation: heartbeat-pulse calc(var(--loader-speed) * 1.2) ease-in-out infinite;
  will-change: transform;
}

@keyframes heartbeat-pulse {
  0%, 100% {
    transform: scale(1);
  }
  5% {
    transform: scale(1.2);
  }
  10% {
    transform: scale(1);
  }
  15% {
    transform: scale(1.3);
  }
  20% {
    transform: scale(1);
  }
}

/* ========================================
   PROGRESS LOADER (with percentage)
   ======================================== */
.simple-loader-progress .progress-container {
  width: calc(var(--loader-size) * 3);
  position: relative;
}

.simple-loader-progress .progress-bar {
  width: 100%;
  height: calc(var(--loader-size) * 0.2);
  background: rgba(0, 0, 0, 0.1);
  border-radius: calc(var(--loader-size) * 0.1);
  overflow: hidden;
  position: relative;
}

.simple-loader-progress .progress-fill {
  height: 100%;
  background: var(--loader-color);
  border-radius: calc(var(--loader-size) * 0.1);
  transition: width 0.3s ease;
  box-shadow: 0 0 10px var(--loader-color);
}

.simple-loader-progress .progress-text {
  text-align: center;
  margin-top: 8px;
  color: var(--loader-color);
  font-size: calc(var(--loader-size) * 0.3);
  font-weight: 600;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ========================================
   OVERLAY
   ======================================== */
.simple-loader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 9998;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  transition: opacity 0.3s ease;
}

/* ========================================
   MOBILE OPTIMIZATIONS
   ======================================== */
@media (max-width: 768px) {
  .simple-loader {
    /* Ensure touch-friendly sizing on mobile */
    --loader-size: 40px;
  }
}

@media (max-width: 480px) {
  .simple-loader {
    --loader-size: 36px;
  }
  
  .simple-loader-bar .bar {
    width: calc(var(--loader-size) * 3);
  }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  .simple-loader *,
  .simple-loader *::before,
  .simple-loader *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .simple-loader-spinner .spinner {
    border-width: 5px;
  }
  
  .simple-loader-dots .dot,
  .simple-loader-pulse .pulse {
    outline: 2px solid currentColor;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  .simple-loader-spinner .spinner {
    border-color: rgba(255, 255, 255, 0.1);
  }
  
  .simple-loader-bar .bar {
    background: rgba(255, 255, 255, 0.1);
  }
}

/* ========================================
   PERFORMANCE OPTIMIZATIONS
   ======================================== */
.simple-loader * {
  /* GPU acceleration for smooth animations */
  transform: translateZ(0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-perspective: 1000;
  perspective: 1000;
}