/*
 * Animations & Visual Enhancements for OpenJudge Documentation
 * Phase 3: 视觉增强
 *
 * Features:
 * - Keyframe Animations (fadeIn, slideUp, shimmer, pulse, etc.)
 * - Page Load Effects
 * - Hover Interactions
 * - Transition Effects
 * - Visual Polish (shadows, gradients, etc.)
 */

/* ========================================
   CSS Variables - Animation System
   ======================================== */

:root {
  /* Animation Timing */
  --rm-transition-fast: 0.15s;
  --rm-transition-normal: 0.25s;
  --rm-transition-slow: 0.4s;
  --rm-ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --rm-ease-in: cubic-bezier(0.4, 0, 1, 1);
  --rm-ease-out: cubic-bezier(0, 0, 0.2, 1);
  --rm-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadow System */
  --rm-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --rm-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --rm-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --rm-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Hover Lift */
  --rm-lift-sm: translateY(-2px);
  --rm-lift-md: translateY(-4px);
}

/* Dark mode shadows */
.dark,
.dark {
  --rm-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --rm-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --rm-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --rm-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
}

/* ========================================
   Keyframe Animations
   ======================================== */

/* Fade In */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Fade In Up */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fade In Down */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Slide Up */
@keyframes slideUp {
  from {
    transform: translateY(10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Slide Down */
@keyframes slideDown {
  from {
    transform: translateY(-10px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Slide In From Left */
@keyframes slideInLeft {
  from {
    transform: translateX(-20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Slide In From Right */
@keyframes slideInRight {
  from {
    transform: translateX(20px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Scale In */
@keyframes scaleIn {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* Pulse */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

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

/* Spin */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Bounce */
@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Wiggle */
@keyframes wiggle {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-3deg);
  }
  75% {
    transform: rotate(3deg);
  }
}

/* Expand (for collapsible sections) */
@keyframes expand {
  from {
    max-height: 0;
    opacity: 0;
  }
  to {
    max-height: 2000px;
    opacity: 1;
  }
}

/* Collapse */
@keyframes collapse {
  from {
    max-height: 2000px;
    opacity: 1;
  }
  to {
    max-height: 0;
    opacity: 0;
  }
}

/* Glow */
@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 5px currentColor;
  }
  50% {
    box-shadow: 0 0 20px currentColor;
  }
}

/* ========================================
   Page Load Animations
   ======================================== */

/* Main content fade in */
article,
.md-content__inner,
main.md-main {
  animation: fadeInUp 0.5s var(--rm-ease-out) forwards;
}

/* Stagger animation for list items on load */
article > *:nth-child(1) { animation-delay: 0ms; }
article > *:nth-child(2) { animation-delay: 50ms; }
article > *:nth-child(3) { animation-delay: 100ms; }
article > *:nth-child(4) { animation-delay: 150ms; }
article > *:nth-child(5) { animation-delay: 200ms; }

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  article,
  .md-content__inner,
  main.md-main {
    animation: none;
  }
}

/* ========================================
   Link Hover Effects
   ======================================== */

article a:not(.button):not(.btn),
.prose a:not(.button):not(.btn),
.md-typeset a:not(.button):not(.btn) {
  position: relative;
  transition: color var(--rm-transition-fast) var(--rm-ease-smooth);
}

/* Animated underline on hover */
article a:not(.button):not(.btn)::after,
.prose a:not(.button):not(.btn)::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width var(--rm-transition-normal) var(--rm-ease-out);
}

article a:not(.button):not(.btn):hover::after,
.prose a:not(.button):not(.btn):hover::after {
  width: 100%;
}

/* External link icon animation */
article a[href^="http"]::after,
.prose a[href^="http"]::after {
  display: inline-block;
  transition: transform var(--rm-transition-fast) var(--rm-ease-smooth);
}

article a[href^="http"]:hover::after,
.prose a[href^="http"]:hover::after {
  transform: translate(2px, -2px);
}

/* ========================================
   Button Hover Effects
   ======================================== */

button,
.button,
.btn,
.md-button,
input[type="submit"],
input[type="button"] {
  position: relative;
  transition: all var(--rm-transition-normal) var(--rm-ease-smooth);
  cursor: pointer;
}

button:hover,
.button:hover,
.btn:hover,
.md-button:hover {
  transform: var(--rm-lift-sm);
  box-shadow: var(--rm-shadow-md);
}

button:active,
.button:active,
.btn:active,
.md-button:active {
  transform: scale(0.98);
  box-shadow: var(--rm-shadow-sm);
}

/* Ripple effect on click */
button::before,
.button::before,
.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

button:active::before,
.button:active::before,
.btn:active::before {
  width: 300px;
  height: 300px;
}

/* ========================================
   Code Block Hover Effects
   ======================================== */

/* Code block container */
.highlight,
.codehilite,
pre[class*="language-"],
div[class*="highlight-"] {
  position: relative;
  transition: all var(--rm-transition-normal) var(--rm-ease-smooth);
  box-shadow: var(--rm-shadow-sm);
}

.highlight:hover,
.codehilite:hover,
pre[class*="language-"]:hover,
div[class*="highlight-"]:hover {
  box-shadow: var(--rm-shadow-md);
  transform: translateY(-1px);
}

/* Copy button hover effect */
.copy-button,
button[data-clipboard-target],
.md-clipboard {
  opacity: 0;
  transform: scale(0.9);
  transition: all var(--rm-transition-fast) var(--rm-ease-smooth);
}

.highlight:hover .copy-button,
.codehilite:hover .copy-button,
pre:hover .copy-button,
.highlight:hover .md-clipboard,
.codehilite:hover .md-clipboard,
pre:hover .md-clipboard {
  opacity: 1;
  transform: scale(1);
}

.copy-button:hover,
.md-clipboard:hover {
  transform: scale(1.1);
  background: var(--primary, #3b82f6);
  color: white;
}

.copy-button:active,
.md-clipboard:active {
  transform: scale(0.95);
}

/* Copy success animation */
.copy-button.copied,
.md-clipboard.copied {
  animation: pulse 0.4s var(--rm-ease-smooth);
}

/* Code language badge */
.highlight > .language-name,
pre > .language-name,
.code-lang-badge {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.125rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(0, 0, 0, 0.6);
  color: rgba(255, 255, 255, 0.9);
  border-radius: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.7;
  transition: opacity var(--rm-transition-fast) var(--rm-ease-smooth);
  pointer-events: none;
  backdrop-filter: blur(4px);
}

.highlight:hover > .language-name,
pre:hover > .language-name,
.code-lang-badge:hover {
  opacity: 1;
}

/* ========================================
   Card & Container Effects
   ======================================== */

/* Admonition hover effect */
article .admonition,
.prose .admonition,
.md-typeset .admonition {
  transition: all var(--rm-transition-normal) var(--rm-ease-smooth);
  box-shadow: var(--rm-shadow-sm);
}

article .admonition:hover,
.prose .admonition:hover,
.md-typeset .admonition:hover {
  box-shadow: var(--rm-shadow-md);
  transform: translateY(-2px);
}

/* Workflow steps hover */
.workflow ol > li,
ol.workflow-steps > li {
  transition: all var(--rm-transition-normal) var(--rm-ease-smooth);
}

.workflow ol > li:hover,
ol.workflow-steps > li:hover {
  transform: translateX(4px);
}

.workflow ol > li::before,
ol.workflow-steps > li::before {
  transition: all var(--rm-transition-normal) var(--rm-ease-smooth);
}

.workflow ol > li:hover::before,
ol.workflow-steps > li:hover::before {
  transform: scale(1.1);
  box-shadow: var(--rm-shadow-md);
}

/* ========================================
   Tab Switching Animations
   ======================================== */

/* Tab content transition */
.tabbed-block {
  animation: fadeIn var(--rm-transition-normal) var(--rm-ease-smooth);
}

.tabbed-block--active {
  animation: slideDown var(--rm-transition-normal) var(--rm-ease-smooth);
}

/* Tab label transition */
.tabbed-labels > label,
.tabbed-set label {
  position: relative;
  transition: all var(--rm-transition-fast) var(--rm-ease-smooth);
}

.tabbed-labels > label:hover,
.tabbed-set label:hover {
  transform: translateY(-2px);
}

/* Active tab indicator animation */
.tabbed-labels > label::after,
.tabbed-set label::after {
  transition: all var(--rm-transition-normal) var(--rm-ease-smooth);
}

/* ========================================
   Collapsible/Details Animation
   ======================================== */

/* Details element smooth expand/collapse */
article details,
.prose details,
.md-typeset details {
  overflow: hidden;
  transition: all var(--rm-transition-normal) var(--rm-ease-smooth);
}

article details[open],
.prose details[open],
.md-typeset details[open] {
  animation: slideDown var(--rm-transition-normal) var(--rm-ease-smooth);
}

article details summary,
.prose details summary,
.md-typeset details summary {
  transition: all var(--rm-transition-fast) var(--rm-ease-smooth);
}

article details summary:hover,
.prose details summary:hover,
.md-typeset details summary:hover {
  background: var(--muted, #f3f4f6);
  padding-left: 1.5rem;
}

/* Arrow rotation animation is already in readability-enhancements.css */

/* ========================================
   Image & Media Effects
   ======================================== */

/* Image lazy loading placeholder */
img[loading="lazy"] {
  background: linear-gradient(
    90deg,
    var(--muted, #f3f4f6) 0%,
    var(--muted-foreground, #e5e7eb) 50%,
    var(--muted, #f3f4f6) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

img[loading="lazy"].loaded {
  animation: fadeIn 0.3s var(--rm-ease-out);
  background: transparent;
}

/* Image hover effect */
article img,
.prose img,
.md-typeset img {
  transition: all var(--rm-transition-normal) var(--rm-ease-smooth);
}

article img:hover,
.prose img:hover,
.md-typeset img:hover {
  transform: scale(1.02);
  box-shadow: var(--rm-shadow-lg);
}

/* Figure animation */
article figure,
.prose figure,
.md-typeset figure {
  animation: fadeInUp 0.6s var(--rm-ease-out);
}

/* ========================================
   Table Hover Effects
   ======================================== */

/* Table row hover (already in table-enhancements.css, just adding animation) */
article table tbody tr,
.prose table tbody tr,
.md-typeset table tbody tr {
  transition: all var(--rm-transition-fast) var(--rm-ease-smooth);
}

/* ========================================
   Navigation & Sidebar Effects
   ======================================== */

/* Sidebar items */
.md-nav__item,
.md-nav__link,
nav li a {
  transition: all var(--rm-transition-fast) var(--rm-ease-smooth);
}

.md-nav__link:hover,
nav li a:hover {
  transform: translateX(4px);
  color: var(--primary, #3b82f6);
}

/* Active nav item indicator */
.md-nav__link--active,
nav li a.active,
nav li a[aria-current="page"] {
  position: relative;
}

.md-nav__link--active::before,
nav li a.active::before,
nav li a[aria-current="page"]::before {
  content: '';
  position: absolute;
  left: -1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 70%;
  background: var(--primary, #3b82f6);
  border-radius: 2px;
  animation: slideInLeft 0.3s var(--rm-ease-out);
}

/* ========================================
   Loading States
   ======================================== */

/* Skeleton loader */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--muted, #f3f4f6) 25%,
    var(--muted-foreground, #e5e7eb) 50%,
    var(--muted, #f3f4f6) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius, 0.375rem);
}

/* Spinner */
.spinner,
.loading-spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid var(--muted, #e5e7eb);
  border-top-color: var(--primary, #3b82f6);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ========================================
   Decorative Elements
   ======================================== */

/* Gradient dividers */
hr.gradient,
.divider-gradient {
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--primary, #3b82f6) 50%,
    transparent 100%
  );
  border: none;
  margin: 3em 0;
}

/* Animated gradient background (optional) */
.hero-gradient,
.gradient-bg {
  background: linear-gradient(
    135deg,
    var(--primary, #3b82f6) 0%,
    var(--primary-dark, #2563eb) 100%
  );
  background-size: 200% 200%;
  animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* Glow effect for highlights */
.glow,
.highlight-glow {
  animation: glow 2s ease-in-out infinite;
}

/* ========================================
   Scroll Animations
   ======================================== */

/* Fade in elements on scroll (requires JS) */
.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--rm-ease-out), transform 0.6s var(--rm-ease-out);
}

.fade-in-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Slide in from left on scroll */
.slide-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.6s var(--rm-ease-out), transform 0.6s var(--rm-ease-out);
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Slide in from right on scroll */
.slide-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.6s var(--rm-ease-out), transform 0.6s var(--rm-ease-out);
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ========================================
   Focus States (Accessibility)
   ======================================== */

/* Enhance focus indicators with animation */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--primary, #3b82f6);
  outline-offset: 2px;
  animation: pulse 0.4s var(--rm-ease-smooth);
}

/* ========================================
   Special Effects
   ======================================== */

/* Confetti effect (for success states) */
@keyframes confetti {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

/* Shake (for errors) */
@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-4px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(4px);
  }
}

.shake {
  animation: shake 0.4s var(--rm-ease-smooth);
}

/* Bounce in (for notifications) */
@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
  }
}

.bounce-in {
  animation: bounceIn 0.6s var(--rm-ease-out);
}

/* ========================================
   Performance Optimizations
   ======================================== */

/* Hardware acceleration for smooth animations */
.highlight,
.codehilite,
.admonition,
button,
.button,
a,
img {
  will-change: auto;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* Prevent layout shifts during animations */
* {
  transform: translateZ(0);
}

/* ========================================
   Utility Classes
   ======================================== */

.animate-fadeIn { animation: fadeIn 0.3s var(--rm-ease-out); }
.animate-fadeInUp { animation: fadeInUp 0.5s var(--rm-ease-out); }
.animate-fadeInDown { animation: fadeInDown 0.5s var(--rm-ease-out); }
.animate-slideUp { animation: slideUp 0.3s var(--rm-ease-out); }
.animate-slideDown { animation: slideDown 0.3s var(--rm-ease-out); }
.animate-slideInLeft { animation: slideInLeft 0.4s var(--rm-ease-out); }
.animate-slideInRight { animation: slideInRight 0.4s var(--rm-ease-out); }
.animate-scaleIn { animation: scaleIn 0.3s var(--rm-ease-out); }
.animate-pulse { animation: pulse 2s infinite; }
.animate-spin { animation: spin 1s linear infinite; }
.animate-bounce { animation: bounce 1s infinite; }
.animate-wiggle { animation: wiggle 0.5s var(--rm-ease-smooth); }

/* Delay utilities */
.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }
.delay-500 { animation-delay: 500ms; }

/* Duration utilities */
.duration-fast { animation-duration: var(--rm-transition-fast); }
.duration-normal { animation-duration: var(--rm-transition-normal); }
.duration-slow { animation-duration: var(--rm-transition-slow); }