/**
 * 动画增强系统
 * 基于 Gmail 和 Material Design 动画原则
 */

/* ============================================
   1. 基础动画关键帧
   ============================================ */

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

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

/* 从上滑入 */
@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 从下滑入 */
@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 从左滑入 */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 从右滑入 */
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* 缩放进入 */
@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* 缩放退出 */
@keyframes scaleOut {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.9);
  }
}

/* 弹跳进入 */
@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);
  }
}

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

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

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

/* 闪烁 */
@keyframes blink {
  0%, 50%, 100% {
    opacity: 1;
  }
  25%, 75% {
    opacity: 0.5;
  }
}

/* 波纹扩散 */
@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 1;
  }
  100% {
    transform: scale(4);
    opacity: 0;
  }
}

/* 骨架屏闪烁 */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* 进度条加载 */
@keyframes progress {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* ============================================
   2. 工具类动画
   ============================================ */

/* 淡入动画 */
.animate-fade-in {
  animation: fadeIn var(--duration-normal) var(--ease-standard);
}

.animate-fade-in-fast {
  animation: fadeIn var(--duration-fast) var(--ease-standard);
}

.animate-fade-in-slow {
  animation: fadeIn var(--duration-slow) var(--ease-standard);
}

/* 滑入动画 */
.animate-slide-in-down {
  animation: slideInDown var(--duration-normal) var(--ease-decelerate);
}

.animate-slide-in-up {
  animation: slideInUp var(--duration-normal) var(--ease-decelerate);
}

.animate-slide-in-left {
  animation: slideInLeft var(--duration-normal) var(--ease-decelerate);
}

.animate-slide-in-right {
  animation: slideInRight var(--duration-normal) var(--ease-decelerate);
}

/* 缩放动画 */
.animate-scale-in {
  animation: scaleIn var(--duration-normal) var(--ease-standard);
}

.animate-bounce-in {
  animation: bounceIn var(--duration-slow) var(--ease-bounce);
}

/* 旋转动画 */
.animate-spin {
  animation: spin 1s linear infinite;
}

/* 脉冲动画 */
.animate-pulse {
  animation: pulse 2s var(--ease-standard) infinite;
}

/* 摇晃动画 */
.animate-shake {
  animation: shake 0.5s var(--ease-standard);
}

/* ============================================
   3. 邮件列表动画
   ============================================ */

/* 邮件行进入动画 */
.gmail-email-row {
  animation: slideInLeft var(--duration-fast) var(--ease-decelerate);
}

.gmail-email-row:nth-child(1) { animation-delay: 0ms; }
.gmail-email-row:nth-child(2) { animation-delay: 30ms; }
.gmail-email-row:nth-child(3) { animation-delay: 60ms; }
.gmail-email-row:nth-child(4) { animation-delay: 90ms; }
.gmail-email-row:nth-child(5) { animation-delay: 120ms; }
.gmail-email-row:nth-child(6) { animation-delay: 150ms; }
.gmail-email-row:nth-child(7) { animation-delay: 180ms; }
.gmail-email-row:nth-child(8) { animation-delay: 210ms; }
.gmail-email-row:nth-child(9) { animation-delay: 240ms; }
.gmail-email-row:nth-child(10) { animation-delay: 270ms; }

/* 邮件行悬停效果 */
.gmail-email-row {
  position: relative;
  transition: all var(--duration-fast) var(--ease-standard);
}

.gmail-email-row::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  background: rgba(242, 245, 245, 0.8);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-standard);
  pointer-events: none;
  z-index: -1;
}

.gmail-email-row:hover::before {
  opacity: 0;  /* 禁用这个效果，使用背景色代替 */
}

/* 邮件选中动画 */
.gmail-email-row.selected {
  animation: pulse var(--duration-fast) var(--ease-standard);
}

/* 邮件删除动画 */
.gmail-email-row.deleting {
  animation: slideOutLeft var(--duration-normal) var(--ease-accelerate) forwards;
}

@keyframes slideOutLeft {
  to {
    opacity: 0;
    transform: translateX(-100%);
  }
}

/* 邮件归档动画 */
.gmail-email-row.archiving {
  animation: slideOutRight var(--duration-normal) var(--ease-accelerate) forwards;
}

@keyframes slideOutRight {
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* ============================================
   4. 按钮交互动画
   ============================================ */

/* 按钮点击波纹效果 */
.btn,
.gmail-icon-btn,
.gmail-toolbar-btn {
  position: relative;
  overflow: hidden;
}

.btn::after,
.gmail-icon-btn::after,
.gmail-toolbar-btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width var(--duration-slow) var(--ease-standard),
              height var(--duration-slow) var(--ease-standard),
              opacity var(--duration-slow) var(--ease-standard);
  opacity: 0;
  pointer-events: none;
}

.btn:active::after,
.gmail-icon-btn:active::after,
.gmail-toolbar-btn:active::after {
  width: 200px;
  height: 200px;
  opacity: 1;
  transition: width 0s, height 0s, opacity 0s;
}

/* 按钮悬停提升效果 */
.btn-primary,
.gmail-compose-btn {
  transition: all var(--duration-fast) var(--ease-standard);
}

.btn-primary:hover,
.gmail-compose-btn:hover {
  transform: translateY(-1px);
}

.btn-primary:active,
.gmail-compose-btn:active {
  transform: translateY(0);
}

/* ============================================
   5. 模态框动画
   ============================================ */

/* 模态框背景淡入 */
.modal-backdrop,
.gmail-detail-overlay,
.gmail-shortcuts-overlay {
  animation: fadeIn var(--duration-normal) var(--ease-standard);
}

/* 模态框内容缩放进入 */
.modal,
.gmail-detail-panel,
.gmail-shortcuts-panel {
  animation: scaleIn var(--duration-normal) var(--ease-decelerate);
}

/* ============================================
   6. Toast 通知动画
   ============================================ */

/* Toast 滑入 */
.toast {
  animation: slideInRight var(--duration-normal) var(--ease-decelerate);
}

/* Toast 滑出 */
.toast.hiding {
  animation: slideOutRight var(--duration-fast) var(--ease-accelerate) forwards;
}

@keyframes slideOutRightFull {
  to {
    opacity: 0;
    transform: translateX(120%);
  }
}

/* ============================================
   7. 下拉菜单动画
   ============================================ */

.dropdown-menu {
  animation: slideInDown var(--duration-fast) var(--ease-decelerate);
  transform-origin: top;
}

.dropdown-menu.dropdown-menu-up {
  animation: slideInUp var(--duration-fast) var(--ease-decelerate);
  transform-origin: bottom;
}

/* ============================================
   8. 加载动画
   ============================================ */

/* 加载旋转器 */
.spinner {
  animation: spin 0.8s linear infinite;
}

/* 骨架屏加载 */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-secondary) 0%,
    var(--bg-hover) 50%,
    var(--bg-secondary) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}

/* 进度条动画 */
.progress-bar-animated {
  position: relative;
  overflow: hidden;
}

.progress-bar-animated::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: progress 1.5s ease-in-out infinite;
}

/* ============================================
   9. 侧边栏动画
   ============================================ */

/* 侧边栏展开/收起 */
.gmail-sidebar {
  transition: width var(--duration-normal) var(--ease-standard);
}

.gmail-sidebar .gmail-nav-item-label,
.gmail-sidebar .gmail-nav-item-count {
  transition: opacity var(--duration-fast) var(--ease-standard),
              transform var(--duration-fast) var(--ease-standard);
}

.gmail-sidebar.collapsed .gmail-nav-item-label,
.gmail-sidebar.collapsed .gmail-nav-item-count {
  opacity: 0;
  transform: translateX(-10px);
}

/* ============================================
   10. 搜索框动画
   ============================================ */

/* 搜索框聚焦动画 */
.gmail-search-box {
  transition: all var(--duration-fast) var(--ease-standard);
}

.gmail-search-box:focus {
  animation: pulse var(--duration-fast) var(--ease-standard);
}

/* 搜索结果高亮 */
@keyframes highlightSearch {
  0%, 100% {
    background: transparent;
  }
  50% {
    background: var(--color-primary-light);
  }
}

.search-highlight {
  animation: highlightSearch 1s var(--ease-standard) 2;
}

/* ============================================
   11. 标签动画
   ============================================ */

/* 标签添加动画 */
.gmail-email-label,
.gmail-detail-label {
  animation: bounceIn var(--duration-normal) var(--ease-bounce);
}

/* 标签移除动画 */
.gmail-email-label.removing,
.gmail-detail-label.removing {
  animation: scaleOut var(--duration-fast) var(--ease-accelerate) forwards;
}

/* ============================================
   12. 复选框动画
   ============================================ */

/* 复选框选中动画 */
.gmail-checkbox:checked {
  animation: pulse var(--duration-fast) var(--ease-standard);
}

/* ============================================
   13. 星标动画
   ============================================ */

/* 星标点击动画 */
.gmail-email-star.starring {
  animation: starBounce var(--duration-normal) var(--ease-bounce);
}

@keyframes starBounce {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.3) rotate(15deg);
  }
  100% {
    transform: scale(1) rotate(0deg);
  }
}

/* ============================================
   14. 附件动画
   ============================================ */

/* 附件上传进度 */
.attachment-uploading {
  position: relative;
  overflow: hidden;
}

.attachment-uploading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--color-primary);
  animation: uploadProgress 2s var(--ease-standard) forwards;
}

@keyframes uploadProgress {
  to {
    width: 100%;
  }
}

/* ============================================
   15. 错误提示动画
   ============================================ */

/* 错误摇晃 */
.error-shake {
  animation: shake 0.5s var(--ease-standard);
}

/* 错误闪烁 */
.error-blink {
  animation: blink 1s var(--ease-standard) 3;
}

/* ============================================
   16. 成功提示动画
   ============================================ */

/* 成功勾选动画 */
@keyframes checkmark {
  0% {
    stroke-dashoffset: 100;
  }
  100% {
    stroke-dashoffset: 0;
  }
}

.success-checkmark {
  animation: checkmark 0.5s var(--ease-decelerate) forwards;
}

/* ============================================
   17. 性能优化
   ============================================ */

/* 减少不必要的重绘 */
.animate-gpu {
  will-change: transform, opacity;
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* 禁用动画 (用户偏好设置) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   18. 页面加载动画
   ============================================ */

/* 页面淡入 */
body {
  animation: fadeIn var(--duration-slow) var(--ease-standard);
}

/* 内容区域渐进加载 */
.gmail-content > * {
  animation: slideInUp var(--duration-normal) var(--ease-decelerate);
}

.gmail-content > *:nth-child(1) { animation-delay: 0ms; }
.gmail-content > *:nth-child(2) { animation-delay: 50ms; }
.gmail-content > *:nth-child(3) { animation-delay: 100ms; }

/* ============================================
   19. 微交互动画
   ============================================ */

/* 悬停提升 */
.hover-lift {
  transition: transform var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-fast) var(--ease-standard);
}

.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* 悬停缩放 */
.hover-scale {
  transition: transform var(--duration-fast) var(--ease-standard);
}

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

/* 悬停旋转 */
.hover-rotate {
  transition: transform var(--duration-fast) var(--ease-standard);
}

.hover-rotate:hover {
  transform: rotate(5deg);
}

/* ============================================
   20. 焦点动画
   ============================================ */

/* 焦点环动画 */
@keyframes focusRing {
  0% {
    box-shadow: 0 0 0 0 var(--color-primary);
  }
  100% {
    box-shadow: 0 0 0 4px var(--color-primary-light);
  }
}

:focus-visible {
  animation: focusRing var(--duration-fast) var(--ease-standard);
}