/**
 * UI Animations Library
 * Comprehensive CSS3 animations and micro-interactions
 */

/* ===== FADE ANIMATIONS ===== */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== SLIDE ANIMATIONS ===== */

@keyframes slideInLeft {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes slideInUp {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(0);
  }
}

/* ===== SCALE ANIMATIONS ===== */

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes scaleOut {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.8);
  }
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes zoomOut {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0);
  }
}

/* ===== BOUNCE ANIMATIONS ===== */

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

@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);
  }
}

@keyframes bounceOut {
  0% {
    transform: scale(1);
  }
  25% {
    transform: scale(0.95);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
  100% {
    opacity: 0;
    transform: scale(0.3);
  }
}

/* ===== ROTATE ANIMATIONS ===== */

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes rotateIn {
  from {
    opacity: 0;
    transform: rotate(-200deg);
  }
  to {
    opacity: 1;
    transform: rotate(0);
  }
}

@keyframes rotateOut {
  from {
    opacity: 1;
    transform: rotate(0);
  }
  to {
    opacity: 0;
    transform: rotate(200deg);
  }
}

/* ===== FLIP ANIMATIONS ===== */

@keyframes flipIn {
  from {
    transform: perspective(400px) rotateY(90deg);
    opacity: 0;
  }
  to {
    transform: perspective(400px) rotateY(0);
    opacity: 1;
  }
}

@keyframes flipOut {
  from {
    transform: perspective(400px) rotateY(0);
    opacity: 1;
  }
  to {
    transform: perspective(400px) rotateY(90deg);
    opacity: 0;
  }
}

/* ===== SHAKE & WOBBLE ANIMATIONS ===== */

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

@keyframes wobble {
  0%, 100% {
    transform: translateX(0);
  }
  15% {
    transform: translateX(-25%) rotate(-5deg);
  }
  30% {
    transform: translateX(20%) rotate(3deg);
  }
  45% {
    transform: translateX(-15%) rotate(-3deg);
  }
  60% {
    transform: translateX(10%) rotate(2deg);
  }
  75% {
    transform: translateX(-5%) rotate(-1deg);
  }
}

/* ===== PULSE & HEARTBEAT ===== */

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.05);
  }
}

@keyframes heartbeat {
  0%, 100% {
    transform: scale(1);
  }
  14% {
    transform: scale(1.3);
  }
  28% {
    transform: scale(1);
  }
  42% {
    transform: scale(1.3);
  }
  70% {
    transform: scale(1);
  }
}

/* ===== SKELETON LOADING ===== */

@keyframes skeletonLoading {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes skeletonFadeIn {
  0% { opacity: 0; transform: translateY(8px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes skeletonPulse {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 0.9; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 0%,
    var(--bg-hover) 50%,
    var(--bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeletonLoading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 1em;
  margin-bottom: var(--spacing-2);
}

.skeleton-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.skeleton-card {
  height: 200px;
}

/* --- Feed skeleton cards --- */
.feed-loading-skeleton {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 0.5rem 0;
}

.post-skeleton {
  background: var(--bg-card, rgba(26, 13, 46, 0.75));
  border: 1px solid var(--border-color, rgba(168, 85, 247, 0.12));
  border-radius: var(--border-radius, 14px);
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
  animation: skeletonFadeIn 0.4s ease-out both;
}

.post-skeleton:nth-child(2) { animation-delay: 0.08s; }
.post-skeleton:nth-child(3) { animation-delay: 0.16s; }
.post-skeleton:nth-child(4) { animation-delay: 0.24s; }

/* Shimmer sweep across each card */
.post-skeleton::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    110deg,
    transparent 20%,
    rgba(168, 85, 247, 0.06) 40%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(168, 85, 247, 0.06) 60%,
    transparent 80%
  );
  background-size: 200% 100%;
  animation: skeletonLoading 2s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

.skeleton-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.post-skeleton .skeleton-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    var(--bg-tertiary) 0%,
    var(--bg-hover) 50%,
    var(--bg-tertiary) 100%
  );
  background-size: 200% 200%;
  animation: skeletonLoading 1.8s ease-in-out infinite, skeletonPulse 2.4s ease-in-out infinite;
  flex-shrink: 0;
}

.skeleton-user-info {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1;
}

.skeleton-line {
  height: 0.75rem;
  border-radius: 4px;
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 0%,
    var(--bg-hover) 50%,
    var(--bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeletonLoading 1.6s ease-in-out infinite;
}

.skeleton-line.skeleton-name {
  width: 35%;
  height: 0.85rem;
}

.skeleton-line.skeleton-username {
  width: 22%;
  height: 0.6rem;
  opacity: 0.6;
}

.skeleton-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.skeleton-content .skeleton-line:nth-child(1) { width: 95%; animation-delay: 0.1s; }
.skeleton-content .skeleton-line:nth-child(2) { width: 80%; animation-delay: 0.2s; }
.skeleton-content .skeleton-line.skeleton-short { width: 55%; animation-delay: 0.3s; }

.skeleton-actions {
  display: flex;
  gap: 1.25rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color, rgba(168, 85, 247, 0.08));
}

.skeleton-button {
  width: 3rem;
  height: 0.65rem;
  border-radius: 4px;
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 0%,
    var(--bg-hover) 50%,
    var(--bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeletonLoading 1.6s ease-in-out infinite;
  opacity: 0.5;
}

.skeleton-button:nth-child(2) { animation-delay: 0.15s; }
.skeleton-button:nth-child(3) { animation-delay: 0.3s; }

/* --- Skeleton for composer --- */
.skeleton-composer {
  background: var(--bg-card-glass, rgba(26, 13, 46, 0.45));
  border: 1px solid var(--border-color, rgba(168, 85, 247, 0.12));
  border-radius: var(--border-radius-lg, 20px);
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  position: relative;
  overflow: hidden;
}

.skeleton-composer::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 30%, rgba(255,255,255,0.04) 50%, transparent 70%);
  background-size: 200% 100%;
  animation: skeletonLoading 2.5s ease-in-out infinite;
  pointer-events: none;
}

.skeleton-composer .skeleton-avatar {
  width: 40px;
  height: 40px;
}

.skeleton-composer .skeleton-input {
  flex: 1;
  height: 2.5rem;
  border-radius: 999px;
  background: var(--bg-primary, #0d0d1a);
  border: 1px solid var(--border-color, rgba(168, 85, 247, 0.1));
  animation: skeletonPulse 2s ease-in-out infinite;
}

/* --- Skeleton notification items --- */
.skeleton-notification {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color, rgba(168,85,247,0.08));
  animation: skeletonFadeIn 0.3s ease-out both;
}

.skeleton-notification:nth-child(2) { animation-delay: 0.06s; }
.skeleton-notification:nth-child(3) { animation-delay: 0.12s; }

.skeleton-notification .skeleton-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.skeleton-notification .skeleton-text-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.skeleton-notification .skeleton-title { width: 60%; height: 0.75rem; }
.skeleton-notification .skeleton-desc  { width: 85%; height: 0.6rem; opacity: 0.5; }

/* --- UIComponents loading-skeleton classes -------------------------------- */
.view-loading-skeleton {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 0.5rem 0;
}

.feed-skeleton-post {
  background: var(--bg-card, rgba(26, 13, 46, 0.75));
  border: 1px solid var(--border-color, rgba(168, 85, 247, 0.12));
  border-radius: var(--border-radius, 14px);
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
  animation: skeletonFadeIn 0.4s ease-out both;
}

.feed-skeleton-post:nth-child(2) { animation-delay: 0.08s; }
.feed-skeleton-post:nth-child(3) { animation-delay: 0.16s; }
.feed-skeleton-post:nth-child(4) { animation-delay: 0.24s; }

.feed-skeleton-post::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg,
    transparent 20%,
    rgba(168, 85, 247, 0.06) 40%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(168, 85, 247, 0.06) 60%,
    transparent 80%);
  background-size: 200% 100%;
  animation: skeletonLoading 2s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

.feed-skeleton-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.875rem;
}

.feed-skeleton-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-tertiary, rgba(255,255,255,0.06)) 0%, var(--bg-hover, rgba(255,255,255,0.1)) 50%, var(--bg-tertiary, rgba(255,255,255,0.06)) 100%);
  background-size: 200% 200%;
  animation: skeletonLoading 1.8s ease-in-out infinite, skeletonPulse 2.4s ease-in-out infinite;
  flex-shrink: 0;
}

.feed-skeleton-meta {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.feed-skeleton-body {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.875rem;
}

.feed-skeleton-actions {
  display: flex;
  gap: 1.25rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color, rgba(168, 85, 247, 0.08));
}

.feed-skeleton-action-btn {
  width: 3rem;
  height: 0.65rem;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--bg-tertiary, rgba(255,255,255,0.06)) 0%, var(--bg-hover, rgba(255,255,255,0.1)) 50%, var(--bg-tertiary, rgba(255,255,255,0.06)) 100%);
  background-size: 200% 100%;
  animation: skeletonLoading 1.6s ease-in-out infinite;
  opacity: 0.5;
}

.feed-skeleton-action-btn:nth-child(2) { animation-delay: 0.15s; }
.feed-skeleton-action-btn:nth-child(3) { animation-delay: 0.3s; }
.feed-skeleton-action-btn:nth-child(4) { animation-delay: 0.45s; }

/* Skeleton text lines (reusable) */
.view-skeleton-line {
  height: 0.75rem;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--bg-tertiary, rgba(255,255,255,0.06)) 0%, var(--bg-hover, rgba(255,255,255,0.1)) 50%, var(--bg-tertiary, rgba(255,255,255,0.06)) 100%);
  background-size: 200% 100%;
  animation: skeletonLoading 1.6s ease-in-out infinite;
}

/* Width utility classes for skeleton lines */
.w-25 { width: 25%; }
.w-30 { width: 30%; }
.w-40 { width: 40%; }
.w-50 { width: 50%; }
.w-60 { width: 60%; }
.w-70 { width: 70%; }
.w-80 { width: 80%; }

/* Profile-view skeleton cards */
.view-skeleton-card {
  background: var(--bg-card, rgba(26, 13, 46, 0.75));
  border: 1px solid var(--border-color, rgba(168, 85, 247, 0.12));
  border-radius: var(--border-radius, 14px);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
  animation: skeletonFadeIn 0.35s ease-out both;
}

.view-skeleton-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 25%, rgba(255, 255, 255, 0.06) 50%, transparent 75%);
  background-size: 200% 100%;
  animation: skeletonLoading 2s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

/* Light theme overrides */
[data-theme="light"] .feed-skeleton-post {
  background: rgba(220, 236, 255, 0.80);
  border-color: rgba(100, 140, 200, 0.15);
}
[data-theme="light"] .feed-skeleton-post::after {
  background: linear-gradient(110deg, transparent 20%, rgba(255,255,255,0.45) 50%, transparent 80%);
}
[data-theme="light"] .view-skeleton-line,
[data-theme="light"] .feed-skeleton-avatar,
[data-theme="light"] .feed-skeleton-action-btn {
  background: linear-gradient(90deg, var(--bg-tertiary, #d5e3f2) 0%, var(--bg-hover, #d8e8f5) 50%, var(--bg-tertiary, #d5e3f2) 100%);
  background-size: 200% 100%;
}
[data-theme="light"] .view-skeleton-card {
  background: rgba(220, 236, 255, 0.80);
  border-color: rgba(100, 140, 200, 0.15);
}

/* ===== SHIMMER EFFECT ===== */

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

@keyframes shimmerWide {
  0% { transform: translateX(-150%); }
  100% { transform: translateX(150%); }
}

@keyframes shimmerDiagonal {
  0% { transform: translateX(-100%) rotate(-5deg); }
  100% { transform: translateX(200%) rotate(-5deg); }
}

.shimmer {
  position: relative;
  overflow: hidden;
}

.shimmer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.1) 50%,
    transparent 100%
  );
  animation: shimmer 2s infinite;
}

/* Subtle purple-tinted shimmer for brand elements */
.shimmer-brand {
  position: relative;
  overflow: hidden;
}

.shimmer-brand::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    110deg,
    transparent 25%,
    rgba(168, 85, 247, 0.08) 45%,
    rgba(236, 72, 153, 0.06) 55%,
    transparent 75%
  );
  animation: shimmerWide 3s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

/* Diagonal shimmer for cards and panels */
.shimmer-diagonal {
  position: relative;
  overflow: hidden;
}

.shimmer-diagonal::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    115deg,
    transparent 30%,
    rgba(255, 255, 255, 0.05) 48%,
    rgba(168, 85, 247, 0.04) 52%,
    transparent 70%
  );
  animation: shimmerDiagonal 4s ease-in-out infinite;
  pointer-events: none;
}

/* Intense shimmer for CTA / interactive elements */
.shimmer-intense {
  position: relative;
  overflow: hidden;
}

.shimmer-intense::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.18) 35%,
    rgba(168, 85, 247, 0.12) 50%,
    rgba(255, 255, 255, 0.18) 65%,
    transparent 100%
  );
  animation: shimmer 2.5s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

/* Soft ambient glow shimmer */
@keyframes shimmerGlow {
  0%, 100% { box-shadow: 0 0 0 0 transparent; }
  50% { box-shadow: 0 0 20px rgba(168, 85, 247, 0.15), 0 0 40px rgba(168, 85, 247, 0.06); }
}

.shimmer-glow {
  animation: shimmerGlow 3s ease-in-out infinite;
}

/* ===== RIPPLE EFFECT ===== */

@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 1;
  }
  100% {
    transform: scale(4);
    opacity: 0;
  }
}

.ripple-effect {
  position: relative;
  overflow: hidden;
}

.ripple-effect::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: scale(0);
  pointer-events: none;
}

.ripple-effect:active::after {
  animation: ripple 0.6s ease-out;
}

/* ===== GLOW EFFECT ===== */

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 5px var(--color-primary),
                0 0 10px var(--color-primary);
  }
  50% {
    box-shadow: 0 0 20px var(--color-primary),
                0 0 30px var(--color-primary);
  }
}

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

/* ===== TYPING INDICATOR ===== */

@keyframes typing {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.5;
  }
  30% {
    transform: translateY(-10px);
    opacity: 1;
  }
}

/* ===== PROGRESS BAR ===== */

@keyframes progress {
  0% {
    width: 0%;
  }
  100% {
    width: 100%;
  }
}

.progress-bar {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--color-primary);
  animation: progress 2s ease-out forwards;
}

/* ===== UTILITY CLASSES ===== */

.animate-fadeIn {
  animation: fadeIn 0.3s ease-out;
}

.animate-fadeInUp {
  animation: fadeInUp 0.3s ease-out;
}

.animate-fadeInDown {
  animation: fadeInDown 0.3s ease-out;
}

.animate-scaleIn {
  animation: scaleIn 0.3s ease-out;
}

.animate-slideInLeft {
  animation: slideInLeft 0.3s ease-out;
}

.animate-slideInRight {
  animation: slideInRight 0.3s ease-out;
}

.animate-bounce {
  animation: bounce 1s ease-in-out infinite;
}

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

.animate-shake {
  animation: shake 0.5s ease-in-out;
}

.animate-spin {
  animation: rotate 1s linear infinite;
}

/* ===== HOVER EFFECTS ===== */

.hover-lift {
  transition: transform var(--transition-fast) var(--ease-out);
}

.hover-lift:hover {
  transform: translateY(-4px);
}

.hover-scale {
  transition: transform var(--transition-fast) var(--ease-out);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-glow {
  transition: box-shadow var(--transition-fast) var(--ease-out);
}

.hover-glow:hover {
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.45);
}

/* ===== DELAYED ANIMATIONS ===== */

.animate-delay-100 {
  animation-delay: 0.1s;
}

.animate-delay-200 {
  animation-delay: 0.2s;
}

.animate-delay-300 {
  animation-delay: 0.3s;
}

.animate-delay-400 {
  animation-delay: 0.4s;
}

.animate-delay-500 {
  animation-delay: 0.5s;
}

/* ===== LOADING SPINNERS ===== */

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: rotate 0.8s linear infinite;
}

.spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

.spinner-lg {
  width: 60px;
  height: 60px;
  border-width: 6px;
}

/* Dual-ring spinner (premium) */
@keyframes spinnerOrbitOuter { to { transform: rotate(360deg); } }
@keyframes spinnerOrbitInner { to { transform: rotate(-540deg); } }

.spinner-dual {
  width: 44px;
  height: 44px;
  position: relative;
}

.spinner-dual::before,
.spinner-dual::after {
  content: '';
  position: absolute;
  border-radius: 50%;
}

.spinner-dual::before {
  inset: 0;
  border: 3px solid transparent;
  border-top-color: var(--color-primary, #a855f7);
  border-right-color: var(--color-primary, #a855f7);
  animation: spinnerOrbitOuter 1s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.spinner-dual::after {
  inset: 6px;
  border: 3px solid transparent;
  border-bottom-color: rgba(236, 72, 153, 0.8);
  border-left-color: rgba(236, 72, 153, 0.8);
  animation: spinnerOrbitInner 0.8s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.spinner-dual-sm { width: 24px; height: 24px; }
.spinner-dual-sm::before, .spinner-dual-sm::after { border-width: 2px; }
.spinner-dual-sm::after { inset: 4px; }

.spinner-dual-lg { width: 64px; height: 64px; }
.spinner-dual-lg::before, .spinner-dual-lg::after { border-width: 4px; }
.spinner-dual-lg::after { inset: 8px; }

/* Triple-dot bounce spinner */
@keyframes dotBounce {
  0%, 80%, 100% { transform: scale(0); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

.spinner-dots {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.spinner-dots > span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary, #a855f7);
  animation: dotBounce 1.2s ease-in-out infinite;
}

.spinner-dots > span:nth-child(2) { animation-delay: 0.15s; }
.spinner-dots > span:nth-child(3) { animation-delay: 0.3s; }

/* Gradient arc spinner */
@keyframes spinGradient { to { transform: rotate(360deg); } }

.spinner-gradient {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    transparent 0%,
    var(--color-primary, #a855f7) 40%,
    rgba(236, 72, 153, 0.8) 70%,
    transparent 100%
  );
  animation: spinGradient 1s linear infinite;
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 4px), #000 calc(100% - 3.5px));
  mask: radial-gradient(farthest-side, transparent calc(100% - 4px), #000 calc(100% - 3.5px));
}

.spinner-gradient-sm { width: 24px; height: 24px; }
.spinner-gradient-lg { width: 64px; height: 64px; }

/* Pulsing ring spinner */
@keyframes pulseRing {
  0% { transform: scale(0.5); opacity: 1; }
  100% { transform: scale(1.6); opacity: 0; }
}

.spinner-pulse-ring {
  width: 44px;
  height: 44px;
  position: relative;
}

.spinner-pulse-ring::before,
.spinner-pulse-ring::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--color-primary, #a855f7);
  border-radius: 50%;
  animation: pulseRing 1.5s cubic-bezier(0.2, 0.7, 0.4, 1) infinite;
}

.spinner-pulse-ring::after {
  animation-delay: 0.5s;
}

/* Branded spinner with logo center
   Usage: <div class="spinner-brand"><span class="spinner-brand-text">3888</span></div> */
.spinner-brand {
  width: 52px;
  height: 52px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.spinner-brand::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid transparent;
  border-top-color: var(--color-primary, #a855f7);
  border-right-color: rgba(236, 72, 153, 0.6);
  animation: spinnerOrbitOuter 0.9s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.spinner-brand .spinner-brand-text {
  font-size: 0.65rem;
  font-weight: 800;
  background: linear-gradient(135deg, #a855f7, #ec4899);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
  animation: skeletonPulse 2s ease-in-out infinite;
}

/* Full-screen loading overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13, 13, 26, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  z-index: 10000;
  animation: fadeIn 0.2s ease-out;
}

.loading-overlay .loading-text {
  color: var(--text-secondary, #e2d9f3);
  font-size: 0.875rem;
  font-weight: 500;
  animation: skeletonPulse 2s ease-in-out infinite;
}

/* Inline loading indicator for buttons / small areas */
.loading-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted, #a78bca);
  font-size: 0.8125rem;
}

.loading-inline .spinner-gradient { width: 18px; height: 18px; }
.loading-inline .spinner-dual { width: 18px; height: 18px; }
.loading-inline .spinner-dual::before, .loading-inline .spinner-dual::after { border-width: 2px; }
.loading-inline .spinner-dual::after { inset: 3px; }

/* Light theme overrides */
[data-theme="light"] .post-skeleton {
  background: rgba(220, 236, 255, 0.80);
  border-color: rgba(100, 140, 200, 0.15);
}

[data-theme="light"] .post-skeleton::after {
  background: linear-gradient(
    110deg,
    transparent 20%,
    rgba(168, 85, 247, 0.08) 40%,
    rgba(255, 255, 255, 0.40) 50%,
    rgba(168, 85, 247, 0.08) 60%,
    transparent 80%
  );
}

[data-theme="light"] .skeleton-line,
[data-theme="light"] .skeleton-button,
[data-theme="light"] .post-skeleton .skeleton-avatar {
  background: linear-gradient(90deg, var(--bg-tertiary, #d5e3f2) 0%, var(--bg-hover, #d8e8f5) 50%, var(--bg-tertiary, #d5e3f2) 100%);
  background-size: 200% 100%;
  animation: skeletonLoading 1.6s ease-in-out infinite;
}

[data-theme="light"] .skeleton-composer {
  background: rgba(220, 236, 255, 0.65);
  border-color: rgba(100, 140, 200, 0.15);
}

[data-theme="light"] .loading-overlay {
  background: rgba(226, 236, 247, 0.9);
}

/* ===== SHINE ANIMATIONS ===== */

/* Shine effect that sweeps across elements */
@keyframes shine {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

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

@keyframes shinePulse {
  0%, 100% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
}

/* Shine effect base class */
.shine-effect {
  position: relative;
  overflow: hidden;
}

.shine-effect::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(102, 126, 234, 0.2) 50%,
    transparent 100%
  );
  animation: shine 4s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

/* Subtle shine for cards and containers */
.shine-card {
  position: relative;
  overflow: hidden;
}

.shine-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(255, 255, 255, 0.08) 50%,
    transparent 70%
  );
  animation: shineSubtle 6s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

/* Shine effect for buttons */
.shine-button {
  position: relative;
  overflow: hidden;
}

.shine-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.3) 50%,
    transparent 100%
  );
  transition: left 0.5s ease;
  pointer-events: none;
  z-index: 1;
}

.shine-button:hover::before {
  left: 100%;
}

/* Pulsing shine for emphasis */
.shine-pulse {
  position: relative;
  overflow: hidden;
}

.shine-pulse::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    circle,
    rgba(102, 126, 234, 0.15) 0%,
    transparent 70%
  );
  animation: shinePulse 3s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

/* Gradient shine (for headers and special elements) */
.shine-gradient {
  position: relative;
  overflow: hidden;
  background: linear-gradient(
    135deg,
    var(--bg-secondary) 0%,
    var(--bg-tertiary) 50%,
    var(--bg-secondary) 100%
  );
  background-size: 200% 200%;
  animation: shineGradient 5s ease infinite;
}

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

/* Ensure content stays above shine effects */
.shine-effect > *,
.shine-card > *,
.shine-button > *,
.shine-pulse > *,
.shine-gradient > * {
  position: relative;
  z-index: 2;
}

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

/* Pop + color pulse for like/reaction activation */
@keyframes statePopColor {
  0% { transform: scale(1); }
  25% { transform: scale(1.2); filter: brightness(1.25); }
  50% { transform: scale(0.95); }
  100% { transform: scale(1); filter: brightness(1); }
}

/* Shadow glow pulse for follow/tab activation */
@keyframes stateShadowPulse {
  0% { box-shadow: 0 0 0 0 rgba(168, 85, 247, 0.5); }
  50% { box-shadow: 0 0 12px 4px rgba(168, 85, 247, 0.35); }
  100% { box-shadow: 0 0 0 0 rgba(168, 85, 247, 0); }
}

/* Bounce on click */
@keyframes stateBounceClick {
  0% { transform: scale(1); }
  30% { transform: scale(0.88); }
  60% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

/* Badge pop-in */
@keyframes stateBadgePop {
  0% { transform: scale(0); opacity: 0; }
  50% { transform: scale(1.3); opacity: 1; }
  70% { transform: scale(0.9); }
  100% { transform: scale(1); opacity: 1; }
}

/* Subtle highlight flash for unread/active items */
@keyframes stateHighlightFlash {
  0% { box-shadow: inset 0 0 0 0 rgba(168, 85, 247, 0); }
  30% { box-shadow: inset 0 0 8px 2px rgba(168, 85, 247, 0.15); }
  100% { box-shadow: inset 0 0 0 0 rgba(168, 85, 247, 0); }
}

/* Utility: bounce on :active click – apply .bounce-click to any element */
.bounce-click:active {
  animation: stateBounceClick 0.3s ease-out;
}

/* ===== BADGE ANIMATIONS ===== */

/* Badge pulse — continuous subtle glow on unread badges */
@keyframes badgePulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.5); }
  50% { box-shadow: 0 0 8px 3px rgba(239, 68, 68, 0.35); }
}

/* Badge bounce — initial bounce when count updates */
@keyframes badgeBounce {
  0% { transform: scale(1); }
  15% { transform: scale(1.45); }
  30% { transform: scale(0.85); }
  45% { transform: scale(1.2); }
  60% { transform: scale(0.95); }
  75% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

/* Badge enter — first appearance pop-in */
@keyframes badgeEnter {
  0% { transform: scale(0) rotate(-30deg); opacity: 0; }
  50% { transform: scale(1.3) rotate(5deg); opacity: 1; }
  70% { transform: scale(0.9) rotate(-2deg); }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}

/* Apply pulse to visible header badges */
.badge:not(.hidden),
.side-menu-badge:not(.hidden) {
  animation: badgePulse 2.5s ease-in-out infinite;
}

/* Badge bounce trigger class — added by JS, removed after animation */
.badge-bounce {
  animation: badgeBounce 0.7s cubic-bezier(0.36, 0.07, 0.19, 0.97) !important;
}

/* Badge first-show enter */
.badge-enter {
  animation: badgeEnter 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

/* ===== VIEW TRANSITION ANIMATIONS ===== */

/* View enter — elegant fade + rise for view switching */
@keyframes viewEnter {
  0% { opacity: 0; transform: translateY(18px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* View exit — used for outgoing view */
@keyframes viewExit {
  0% { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(-12px); }
}

.view.active {
  animation: viewEnter 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Settings section stagger — each section slides in with increasing delay */
.settings-section {
  animation: viewEnter 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.settings-section:nth-child(1) { animation-delay: 0.04s; }
.settings-section:nth-child(2) { animation-delay: 0.1s; }
.settings-section:nth-child(3) { animation-delay: 0.16s; }
.settings-section:nth-child(4) { animation-delay: 0.22s; }
.settings-section:nth-child(5) { animation-delay: 0.28s; }
.settings-section:nth-child(6) { animation-delay: 0.34s; }

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

/* Dropdown open — scale + fade from top */
@keyframes dropdownOpen {
  0% { opacity: 0; transform: translateY(-8px) scale(0.96); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

/* Dropdown close */
@keyframes dropdownClose {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-8px) scale(0.96); }
}

.navbar-dropdown:not(.hidden) {
  animation: dropdownOpen 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Dropdown item stagger reveal */
@keyframes dropdownItemReveal {
  0% { opacity: 0; transform: translateX(-10px); }
  100% { opacity: 1; transform: translateX(0); }
}

.dropdown-item {
  animation: dropdownItemReveal 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.dropdown-item:nth-child(1) { animation-delay: 0.03s; }
.dropdown-item:nth-child(2) { animation-delay: 0.06s; }
.dropdown-item:nth-child(3) { animation-delay: 0.09s; }
.dropdown-item:nth-child(4) { animation-delay: 0.12s; }
.dropdown-item:nth-child(5) { animation-delay: 0.15s; }
.dropdown-item:nth-child(6) { animation-delay: 0.18s; }
.dropdown-item:nth-child(7) { animation-delay: 0.21s; }
.dropdown-item:nth-child(8) { animation-delay: 0.24s; }

/* ===== USER SETTINGS DROPDOWN ===== */

@keyframes userDropdownOpen {
  0% { opacity: 0; transform: translateY(-12px) scale(0.92); }
  60% { transform: translateY(3px) scale(1.01); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.user-settings-dropdown {
  animation: userDropdownOpen 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.user-settings-dropdown .usd-item {
  animation: dropdownItemReveal 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.user-settings-dropdown .usd-item:nth-child(1) { animation-delay: 0.04s; }
.user-settings-dropdown .usd-item:nth-child(2) { animation-delay: 0.08s; }
.user-settings-dropdown .usd-item:nth-child(3) { animation-delay: 0.12s; }
.user-settings-dropdown .usd-item:nth-child(4) { animation-delay: 0.16s; }
.user-settings-dropdown .usd-item:nth-child(5) { animation-delay: 0.20s; }
.user-settings-dropdown .usd-item:nth-child(6) { animation-delay: 0.24s; }
.user-settings-dropdown .usd-item:nth-child(7) { animation-delay: 0.28s; }
.user-settings-dropdown .usd-item:nth-child(8) { animation-delay: 0.32s; }
.user-settings-dropdown .usd-item:nth-child(9) { animation-delay: 0.36s; }

/* ===== PULL-TO-REFRESH BOUNCE ===== */

/* PTR release bounce — spring-back after release */
@keyframes ptrReleaseBounce {
  0% { transform: translateY(0); }
  20% { transform: translateY(-18px); }
  40% { transform: translateY(8px); }
  60% { transform: translateY(-5px); }
  80% { transform: translateY(2px); }
  100% { transform: translateY(0); }
}

/* PTR spinner entrance */
@keyframes ptrSpinnerEnter {
  0% { transform: scale(0) rotate(-180deg); opacity: 0; }
  60% { transform: scale(1.15) rotate(10deg); opacity: 1; }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}

.ptr-release-bounce {
  animation: ptrReleaseBounce 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.ptr-spinner-enter {
  animation: ptrSpinnerEnter 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

/* ===== POST / CONTENT UPDATE BOUNCE ===== */

/* Post bounce — subtle bounce when thread or content is updated */
@keyframes postUpdateBounce {
  0% { transform: translateY(0); box-shadow: var(--shadow-md, 0 4px 6px rgba(0,0,0,0.1)); }
  20% { transform: translateY(-6px); box-shadow: 0 10px 20px rgba(168, 85, 247, 0.15); }
  40% { transform: translateY(3px); }
  60% { transform: translateY(-2px); box-shadow: 0 6px 12px rgba(168, 85, 247, 0.08); }
  80% { transform: translateY(1px); }
  100% { transform: translateY(0); box-shadow: var(--shadow-md, 0 4px 6px rgba(0,0,0,0.1)); }
}

/* New post prepend slide-in */
@keyframes postPrependSlide {
  0% { opacity: 0; transform: translateY(-30px) scale(0.97); max-height: 0; }
  40% { opacity: 1; transform: translateY(6px) scale(1.01); }
  70% { transform: translateY(-2px) scale(1); }
  100% { transform: translateY(0) scale(1); max-height: 2000px; }
}

/* New comment slide-in */
@keyframes commentSlideIn {
  0% { opacity: 0; transform: translateX(-16px); max-height: 0; }
  50% { opacity: 1; transform: translateX(4px); }
  100% { transform: translateX(0); max-height: 500px; }
}

.post-update-bounce {
  animation: postUpdateBounce 0.85s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.post-prepend-slide {
  animation: postPrependSlide 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  overflow: hidden;
}

.comment-slide-in {
  animation: commentSlideIn 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
  overflow: hidden;
}

/* ===== OVERSCROLL STRETCH ===== */

@keyframes overscrollStretch {
  0%   { transform: scaleY(1); }
  50%  { transform: scaleY(1.03); }
  100% { transform: scaleY(1); }
}
.overscroll-stretch-top {
  animation: overscrollStretch 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  transform-origin: top center;
}
.overscroll-stretch-bottom {
  animation: overscrollStretch 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  transform-origin: bottom center;
}

/* ===== SIDE MENU ANIMATIONS ===== */

/* Side menu item stagger */
.side-menu-item {
  animation: fadeInLeft 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.side-menu-item:nth-child(1) { animation-delay: 0.03s; }
.side-menu-item:nth-child(2) { animation-delay: 0.06s; }
.side-menu-item:nth-child(3) { animation-delay: 0.09s; }
.side-menu-item:nth-child(4) { animation-delay: 0.12s; }
.side-menu-item:nth-child(5) { animation-delay: 0.15s; }
.side-menu-item:nth-child(6) { animation-delay: 0.18s; }
.side-menu-item:nth-child(7) { animation-delay: 0.21s; }
.side-menu-item:nth-child(8) { animation-delay: 0.24s; }
.side-menu-item:nth-child(9) { animation-delay: 0.27s; }
.side-menu-item:nth-child(10) { animation-delay: 0.30s; }

/* Side menu hover lift */
.side-menu-item:hover {
  transform: translateX(4px);
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

/* ===== BUTTON / INTERACTION ANIMATIONS ===== */

/* Icon button hover glow */
.icon-btn {
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1),
              background 0.25s ease,
              box-shadow 0.3s ease;
}

.icon-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.2);
}

.icon-btn:active {
  transform: scale(0.92);
  transition-duration: 0.1s;
}

/* Settings toggle switch animation */
.settings-toggle .toggle-track {
  transition: background-color 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.4s ease;
}

.settings-toggle input:checked + .toggle-track {
  box-shadow: 0 0 10px rgba(168, 85, 247, 0.3);
}

/* ===== CARD HOVER ANIMATIONS ===== */

/* Generic card lift on hover */
.email-item:hover,
.file-item:hover,
.explore-user-card:hover,
.hashtag-chip:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.35s ease;
}

/* ===== TOAST ANIMATION OVERRIDE ===== */

/* Toast slide-in from bottom with bounce */
@keyframes toastBounceIn {
  0% { opacity: 0; transform: translateY(40px) scale(0.95); }
  50% { opacity: 1; transform: translateY(-6px) scale(1.02); }
  70% { transform: translateY(3px) scale(0.99); }
  100% { transform: translateY(0) scale(1); }
}

/* ===== LANDING PAGE ANIMATIONS ===== */

/* Hero text entrance */
@keyframes heroTextEnter {
  0% { opacity: 0; transform: translateY(30px); filter: blur(4px); }
  100% { opacity: 1; transform: translateY(0); filter: blur(0); }
}

/* Feature card stagger */
@keyframes featureCardEnter {
  0% { opacity: 0; transform: translateY(24px) scale(0.96); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.landing-hero h1 {
  animation: heroTextEnter 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.landing-hero p {
  animation: heroTextEnter 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.15s both;
}

.landing-hero .landing-cta {
  animation: heroTextEnter 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.3s both;
}

.landing-feature-card:nth-child(1) { animation: featureCardEnter 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.4s both; }
.landing-feature-card:nth-child(2) { animation: featureCardEnter 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.5s both; }
.landing-feature-card:nth-child(3) { animation: featureCardEnter 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.6s both; }

/* ===== GRADIENT COLOUR ANIMATIONS ===== */

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

@keyframes gradientRotate {
    0% { background-position: 0% 0%; }
    25% { background-position: 100% 0%; }
    50% { background-position: 100% 100%; }
    75% { background-position: 0% 100%; }
    100% { background-position: 0% 0%; }
}

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

@keyframes borderGlow {
    0%, 100% { border-color: rgba(168, 85, 247, 0.3); }
    50% { border-color: rgba(59, 130, 246, 0.5); }
}

/* Gradient background animation utility */
.gradient-animate {
    background-size: 200% 200%;
    animation: gradientShift 4s ease infinite;
}

/* Branded gradient: purple → blue → cyan */
.gradient-brand {
    background: linear-gradient(135deg, #8b5cf6, #3b82f6, #06b6d4, #8b5cf6);
    background-size: 300% 300%;
    animation: gradientShift 6s ease infinite;
}

/* Warm gradient: amber → rose → purple */
.gradient-warm {
    background: linear-gradient(135deg, #f59e0b, #ef4444, #ec4899, #f59e0b);
    background-size: 300% 300%;
    animation: gradientShift 6s ease infinite;
}

/* Shimmer overlay — apply to ::after pseudo-element */
.shimmer-overlay {
    position: relative;
    overflow: hidden;
}

.shimmer-overlay::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.08),
        transparent
    );
    animation: shimmerSlide 2.5s ease-in-out infinite;
    pointer-events: none;
}

[data-theme="light"] .shimmer-overlay::after {
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.65),
        transparent
    );
}

/* Border glow animation for focused/active elements */
.border-glow {
    animation: borderGlow 3s ease infinite;
}

/* Gradient text utility */
.gradient-text {
    background: linear-gradient(135deg, #8b5cf6, #3b82f6, #06b6d4);
    background-size: 200% 200%;
    animation: gradientShift 4s ease infinite;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Button gradient shimmer */
.btn-gradient-shimmer {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
    border: none;
    color: white;
}

.btn-gradient-shimmer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.15),
        transparent
    );
    animation: shimmerSlide 2s ease-in-out infinite;
    pointer-events: none;
}

/* Skeleton card shimmer — enhanced version */
.skeleton-shimmer {
    position: relative;
    overflow: hidden;
    background: var(--bg-tertiary, rgba(30, 41, 59, 0.5));
    border-radius: 8px;
}

.skeleton-shimmer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(148, 163, 184, 0.08),
        transparent
    );
    animation: shimmerSlide 1.8s ease-in-out infinite;
    pointer-events: none;
}

/* Badge pulse with gradient */
.badge-gradient-pulse {
    background: linear-gradient(135deg, #8b5cf6, #3b82f6);
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite, pulse 2s ease-in-out infinite;
}

/* Profile stat hover shimmer */
.profile-stat {
    position: relative;
    overflow: hidden;
}

.profile-stat::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 40%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(168, 85, 247, 0.06),
        transparent
    );
    transform: translateX(-100%);
    transition: none;
    pointer-events: none;
}

.profile-stat:hover::after {
    animation: shimmerSlide 0.8s ease-out forwards;
}

/* Hashtag chip gradient hover */
.content-hashtag {
    transition: background 0.3s ease, color 0.2s ease;
}

.content-hashtag:hover {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(59, 130, 246, 0.15));
}

/* ===== LOADING SHINE OVERLAYS ===== */
/* Add shine effect to spinners, loading text, and loading containers */

.admin-loading,
.groups-loading,
.feed-loading-spinner,
.fa-spinner.fa-spin {
    position: relative;
    overflow: hidden;
}

.admin-loading::after,
.groups-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(168, 85, 247, 0.06) 25%,
        rgba(255, 255, 255, 0.08) 50%,
        rgba(168, 85, 247, 0.06) 75%,
        transparent 100%
    );
    animation: shimmerSlide 2s ease-in-out infinite;
    pointer-events: none;
}

/* Skeleton containers get a shimmer overlay */
.view-loading-skeleton {
    position: relative;
    overflow: hidden;
}

.view-loading-skeleton::after {
    content: '';
    position: absolute;
    top: 0;
    left: -50%;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(168, 85, 247, 0.04),
        rgba(255, 255, 255, 0.06),
        rgba(168, 85, 247, 0.04),
        transparent
    );
    animation: shimmerSlide 2.5s ease-in-out infinite;
    pointer-events: none;
    z-index: 1;
}

/* ===== 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;
  }
}