/* 页面过渡动画 */
.page-transition {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: white;
  z-index: 9999;
  pointer-events: none;
}

/* 页面淡入淡出过渡 */
.fade-transition {
  opacity: 0;
  transition: opacity 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-transition.active {
  opacity: 1;
}

/* 页面滑动过渡 */
.slide-transition {
  transform: translateX(100%);
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide-transition.active {
  transform: translateX(0);
}

/* 页面缩放过渡 */
.scale-transition {
  transform: scale(0.8);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), opacity 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.scale-transition.active {
  transform: scale(1);
  opacity: 1;
}

/* 页面覆盖过渡 */
.cover-transition {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: white;
  z-index: 9998;
  transform: translateY(-100%);
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.cover-transition.active {
  transform: translateY(0);
}

/* 页面内容过渡 */
.content-fade {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.content-fade.loaded {
  opacity: 1;
  transform: translateY(0);
}

/* 防止页面闪烁 */
body {
  overflow-x: hidden;
}

/* 页面加载时的预加载器 */
.preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9); /* 半透明白色背景 */
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  opacity: 0;
  visibility: hidden;
  pointer-events: none; /* 防止预加载器拦截点击事件 */
}

.preloader:not(.hidden) {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.preloader-spinner {
  width: 30px;
  height: 30px;
  border: 2px solid rgba(0, 123, 255, 0.2);
  border-top: 2px solid #007bff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* 页面切换时防止滚动 */
body.no-scroll {
  overflow: hidden;
}

/* 页面切换时的平滑过渡 */
body {
  transition: opacity 0.4s ease;
}

/* 更多过渡效果 */
.push-transition {
  transform: translateX(100%);
  transition: transform 0.5s ease-in-out;
}

.push-transition.active {
  transform: translateX(0);
}

.slide-from-bottom {
  transform: translateY(100%);
  opacity: 0;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94), opacity 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide-from-bottom.active {
  transform: translateY(0);
  opacity: 1;
}

.zoom-fade {
  transform: scale(1.1);
  opacity: 0;
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94), opacity 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.zoom-fade.active {
  transform: scale(1);
  opacity: 1;
}

.flip-transition {
  transform: perspective(1000px) rotateY(90deg);
  opacity: 0;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.flip-transition.active {
  transform: perspective(1000px) rotateY(0deg);
  opacity: 1;
}