/**
 * MOTION SYSTEM - Professional Animation Framework
 * Physics-based, intentional, hierarchical motion design
 */

/* ============================================
   MOTION FOUNDATION - Timing & Easing
   ============================================ */

:root {
  /* Duration Scale */
  --motion-instant: 80ms;
  --motion-fast: 150ms;
  --motion-normal: 250ms;
  --motion-moderate: 350ms;
  --motion-slow: 500ms;
  --motion-slower: 700ms;
  
  /* Easing Curves - Natural Physics */
  --ease-out-smooth: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-in-smooth: cubic-bezier(0.32, 0, 0.67, 0);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-emphasized: cubic-bezier(0.05, 0.7, 0.1, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Stagger Delays */
  --stagger-xs: 30ms;
  --stagger-sm: 50ms;
  --stagger-md: 80ms;
  --stagger-lg: 120ms;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================
   PAGE TRANSITIONS
   ============================================ */

.page-transition-enter {
  opacity: 0;
  transform: translateX(30px);
}

.page-transition-enter-active {
  opacity: 1;
  transform: translateX(0);
  transition: opacity var(--motion-moderate) var(--ease-out-smooth),
              transform var(--motion-moderate) var(--ease-emphasized);
}

.page-transition-exit {
  opacity: 1;
  transform: translateX(0);
}

.page-transition-exit-active {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity var(--motion-normal) var(--ease-in-smooth),
              transform var(--motion-normal) var(--ease-standard);
}

/* Fade Slide Up (for content sections) */
.fade-slide-up {
  opacity: 0;
  transform: translateY(40px);
  animation: fadeSlideUp var(--motion-moderate) var(--ease-emphasized) forwards;
}

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

/* ============================================
   BUTTON INTERACTIONS
   ============================================ */

button, .btn, a.button {
  position: relative;
  transition: transform var(--motion-fast) var(--ease-out-smooth),
              box-shadow var(--motion-fast) var(--ease-out-smooth),
              background-color var(--motion-fast) var(--ease-out-smooth),
              color var(--motion-fast) var(--ease-out-smooth);
  will-change: transform;
}

button:hover, .btn:hover, a.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

button:active, .btn:active, a.button:active {
  transform: scale(0.97) translateY(0);
  transition-duration: var(--motion-instant);
}

/* Button Ripple Effect */
button::after, .btn::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  opacity: 0;
  transform: scale(0);
  transition: transform var(--motion-moderate) var(--ease-out-smooth),
              opacity var(--motion-moderate) var(--ease-out-smooth);
  pointer-events: none;
}

button:active::after, .btn:active::after {
  transform: scale(2);
  opacity: 1;
  transition-duration: 0s;
}

/* ============================================
   CARD INTERACTIONS
   ============================================ */

.card {
  transition: transform var(--motion-normal) var(--ease-out-smooth),
              box-shadow var(--motion-normal) var(--ease-out-smooth);
  will-change: transform;
}

.card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

/* 3D Tilt Effect */
.card-3d {
  transform-style: preserve-3d;
  perspective: 1000px;
}

.card-3d:hover {
  transform: rotateX(var(--rotate-x, 0deg)) rotateY(var(--rotate-y, 0deg)) translateY(-8px);
}

/* ============================================
   INPUT ANIMATIONS
   ============================================ */

.input-wrapper {
  position: relative;
}

.input-wrapper input,
.input-wrapper textarea {
  transition: border-color var(--motion-fast) var(--ease-out-smooth),
              box-shadow var(--motion-fast) var(--ease-out-smooth),
              transform var(--motion-fast) var(--ease-out-smooth);
}

.input-wrapper input:focus,
.input-wrapper textarea:focus {
  border-color: var(--primary-color, #007bff);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
  transform: scale(1.01);
}

/* Floating Label */
.input-wrapper label {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  transition: transform var(--motion-fast) var(--ease-out-smooth),
              font-size var(--motion-fast) var(--ease-out-smooth),
              color var(--motion-fast) var(--ease-out-smooth);
  pointer-events: none;
  background: white;
  padding: 0 4px;
}

.input-wrapper input:focus + label,
.input-wrapper input:not(:placeholder-shown) + label,
.input-wrapper textarea:focus + label,
.input-wrapper textarea:not(:placeholder-shown) + label {
  transform: translateY(-28px);
  font-size: 0.75rem;
  color: var(--primary-color, #007bff);
}

/* Input Error Shake */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-8px); }
  20%, 40%, 60%, 80% { transform: translateX(8px); }
}

.input-error {
  animation: shake var(--motion-moderate) var(--ease-standard);
  border-color: #dc3545 !important;
}

/* ============================================
   MODAL & DRAWER ANIMATIONS
   ============================================ */

.modal-backdrop {
  opacity: 0;
  transition: opacity var(--motion-normal) var(--ease-out-smooth);
  backdrop-filter: blur(0px);
}

.modal-backdrop.show {
  opacity: 1;
  backdrop-filter: blur(8px);
}

.modal {
  opacity: 0;
  transform: scale(0.9) translateY(20px);
  transition: opacity var(--motion-moderate) var(--ease-emphasized),
              transform var(--motion-moderate) var(--ease-emphasized);
}

.modal.show {
  opacity: 1;
  transform: scale(1) translateY(0);
}

/* Drawer Slide */
.drawer {
  transform: translateX(100%);
  transition: transform var(--motion-moderate) var(--ease-emphasized);
}

.drawer.open {
  transform: translateX(0);
}

.drawer-left {
  transform: translateX(-100%);
}

.drawer-left.open {
  transform: translateX(0);
}

/* ============================================
   DROPDOWN ANIMATIONS
   ============================================ */

.dropdown-menu {
  opacity: 0;
  transform: translateY(-10px) scale(0.95);
  transform-origin: top;
  transition: opacity var(--motion-fast) var(--ease-out-smooth),
              transform var(--motion-fast) var(--ease-emphasized);
  pointer-events: none;
}

.dropdown-menu.show {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

/* Stagger Menu Items */
.dropdown-menu .dropdown-item {
  opacity: 0;
  transform: translateX(-10px);
  animation: slideInLeft var(--motion-fast) var(--ease-out-smooth) forwards;
}

.dropdown-menu.show .dropdown-item:nth-child(1) { animation-delay: 0ms; }
.dropdown-menu.show .dropdown-item:nth-child(2) { animation-delay: 30ms; }
.dropdown-menu.show .dropdown-item:nth-child(3) { animation-delay: 60ms; }
.dropdown-menu.show .dropdown-item:nth-child(4) { animation-delay: 90ms; }
.dropdown-menu.show .dropdown-item:nth-child(5) { animation-delay: 120ms; }
.dropdown-menu.show .dropdown-item:nth-child(6) { animation-delay: 150ms; }

@keyframes slideInLeft {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============================================
   LIST & CONTENT ANIMATIONS
   ============================================ */

/* Stagger List Items */
.stagger-list > * {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeSlideUp var(--motion-normal) var(--ease-emphasized) forwards;
}

.stagger-list > *:nth-child(1) { animation-delay: 0ms; }
.stagger-list > *:nth-child(2) { animation-delay: 50ms; }
.stagger-list > *:nth-child(3) { animation-delay: 100ms; }
.stagger-list > *:nth-child(4) { animation-delay: 150ms; }
.stagger-list > *:nth-child(5) { animation-delay: 200ms; }
.stagger-list > *:nth-child(6) { animation-delay: 250ms; }
.stagger-list > *:nth-child(7) { animation-delay: 300ms; }
.stagger-list > *:nth-child(8) { animation-delay: 350ms; }

/* Smooth Reordering */
.list-item {
  transition: transform var(--motion-normal) var(--ease-standard),
              opacity var(--motion-normal) var(--ease-standard);
}

.list-item-move {
  transition: transform var(--motion-moderate) var(--ease-emphasized);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */

/* Reveal on Scroll */
.scroll-reveal {
  opacity: 0;
  transform: translateY(60px);
  transition: opacity var(--motion-slow) var(--ease-emphasized),
              transform var(--motion-slow) var(--ease-emphasized);
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Parallax Layers */
.parallax-slow {
  transition: transform 0.1s linear;
  will-change: transform;
}

/* Sticky Header Morph */
.header {
  transition: padding var(--motion-normal) var(--ease-standard),
              background-color var(--motion-normal) var(--ease-standard),
              box-shadow var(--motion-normal) var(--ease-standard);
}

.header.scrolled {
  padding: 0.5rem 0;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(10px);
}

/* ============================================
   STATE CHANGE ANIMATIONS
   ============================================ */

/* Loading Skeleton Shimmer */
@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.skeleton {
  background: linear-gradient(
    90deg,
    #f0f0f0 0%,
    #f8f8f8 50%,
    #f0f0f0 100%
  );
  background-size: 1000px 100%;
  animation: shimmer 2s infinite linear;
}

/* Success Check Animation */
@keyframes checkmark {
  0% {
    stroke-dashoffset: 100;
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    stroke-dashoffset: 0;
    opacity: 1;
  }
}

.success-check {
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  animation: checkmark var(--motion-moderate) var(--ease-emphasized) forwards;
}

/* Error Pulse */
@keyframes errorPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.4);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(220, 53, 69, 0);
  }
}

.error-highlight {
  animation: errorPulse 1s ease-out;
}

/* Progress Bar */
.progress-bar {
  transition: width var(--motion-moderate) var(--ease-standard);
}

.progress-bar-animated {
  background-size: 40px 40px;
  animation: progressStripes 1s linear infinite;
}

@keyframes progressStripes {
  0% {
    background-position: 40px 0;
  }
  100% {
    background-position: 0 0;
  }
}

/* ============================================
   LOADING STATES
   ============================================ */

/* Spinner */
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.spinner {
  animation: spin 1s linear infinite;
}

/* Pulse */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* Dots Loading */
@keyframes dotPulse {
  0%, 80%, 100% {
    opacity: 0.3;
    transform: scale(0.8);
  }
  40% {
    opacity: 1;
    transform: scale(1);
  }
}

.loading-dots span {
  animation: dotPulse 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(1) { animation-delay: 0s; }
.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }

/* ============================================
   MICRO-INTERACTIONS
   ============================================ */

/* Checkbox Check */
.checkbox input:checked + .checkmark {
  animation: checkboxPop var(--motion-fast) var(--ease-spring);
}

@keyframes checkboxPop {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}

/* Toggle Switch */
.toggle-switch input:checked + .slider::before {
  transform: translateX(20px);
  transition: transform var(--motion-fast) var(--ease-spring);
}

/* Badge Appear */
.badge-appear {
  animation: badgePop var(--motion-fast) var(--ease-spring);
}

@keyframes badgePop {
  0% {
    transform: scale(0);
  }
  70% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

/* Tooltip */
.tooltip {
  opacity: 0;
  transform: translateY(5px);
  transition: opacity var(--motion-fast) var(--ease-out-smooth),
              transform var(--motion-fast) var(--ease-out-smooth);
  pointer-events: none;
}

.tooltip.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ============================================
   PERFORMANCE OPTIMIZATIONS
   ============================================ */

/* GPU Acceleration */
.gpu-accelerated {
  transform: translateZ(0);
  will-change: transform, opacity;
}

/* Contain Layout Shifts */
.contain-layout {
  contain: layout style paint;
}

/* Reduce Motion for Low Performance */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}