/**
 * ===================================
 * 页面过渡动画系统
 * 包含：页面加载、内容淡入、卡片悬浮、按钮反馈、滚动触发动画
 * ===================================
 */

/* ===== 基础动画变量 ===== */
:root {
  /* 动画时长 */
  --duration-fast: 0.15s;
  --duration-normal: 0.25s;
  --duration-slow: 0.4s;
  --duration-slower: 0.6s;
  
  /* 缓动函数 */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-in-out: cubic-bezier(0.645, 0.045, 0.355, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 1. 页面加载动画 ===== */
.page-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.4s var(--ease-out);
}

.page-transition-overlay.fade-out {
  opacity: 0;
}

/* 加载动画容器 */
.page-transition-content {
  text-align: center;
}

/* Logo动画 */
.page-transition-logo {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  animation: logoPulse 1.2s ease-in-out infinite;
}

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

/* 加载进度条 */
.loading-progress {
  width: 200px;
  height: 3px;
  background: #e2e8f0;
  border-radius: 2px;
  overflow: hidden;
  margin: 0 auto;
}

.loading-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #4F86F7, #10B981);
  border-radius: 2px;
  animation: loadingProgress 1s var(--ease-out) forwards;
}

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

/* ===== 2. 内容淡入效果 ===== */
/* 基础淡入 - 默认隐藏 */
.fade-in {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* 淡入向上 */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* 淡入向下 */
.fade-in-down {
  opacity: 0;
  transform: translateY(-20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* 淡入向左 */
.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* 淡入向右 */
.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* 缩放淡入 */
.fade-in-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.fade-in-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* 延迟类 - 用于错开动画 */
.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }
.delay-500 { transition-delay: 0.5s; }

/* ===== 3. 卡片悬浮动画 ===== */
.card-hover {
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.card-hover:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
}

/* 3D悬浮效果 */
.card-3d-hover {
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
  transform-style: preserve-3d;
}

.card-3d-hover:hover {
  transform: translateY(-8px) perspective(1000px) rotateX(2deg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* 卡片边框高亮 */
.card-border-hover {
  transition: border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
  border: 1px solid #e5e7eb;
}

.card-border-hover:hover {
  border-color: #4F86F7;
  box-shadow: 0 4px 16px rgba(79, 134, 247, 0.15);
}

/* 图片缩放悬浮 */
.img-zoom-hover {
  overflow: hidden;
}

.img-zoom-hover img,
.img-zoom-hover .card-img {
  transition: transform var(--duration-slow) var(--ease-out);
}

.img-zoom-hover:hover img,
.img-zoom-hover:hover .card-img {
  transform: scale(1.08);
}

/* ===== 4. 按钮点击反馈 ===== */
/* 基础按钮动画 */
.btn-animate {
  position: relative;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.btn-animate:active {
  transform: scale(0.96);
}

/* 涟漪效果 */
.btn-ripple {
  position: relative;
  overflow: hidden;
}

.btn-ripple::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.4s ease, height 0.4s ease, opacity 0.4s ease;
  opacity: 0;
}

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

/* 按钮弹跳 */
.btn-bounce {
  transition: transform var(--duration-fast) var(--ease-bounce);
}

.btn-bounce:hover {
  transform: scale(1.02);
}

.btn-bounce:active {
  transform: scale(0.95);
}

/* 按钮颜色渐变 */
.btn-gradient-animate {
  background-size: 200% 100%;
  transition: background-position var(--duration-normal) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
}

.btn-gradient-animate:hover {
  background-position: 100% 0;
}

.btn-gradient-animate:active {
  transform: scale(0.98);
}

/* ===== 5. 滚动触发动画 ===== */
/* 使用 Intersection Observer 的滚动动画 */
.scroll-reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

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

/* 滚动淡入左右交错 */
.scroll-slide-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

.scroll-slide-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

.scroll-slide-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

.scroll-slide-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

/* 滚动缩放 */
.scroll-zoom {
  opacity: 0;
  transform: scale(0.8);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

.scroll-zoom.revealed {
  opacity: 1;
  transform: scale(1);
}

/* 滚动翻转 */
.scroll-flip {
  opacity: 0;
  transform: perspective(1000px) rotateY(90deg);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

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

/* 视差效果容器 */
.parallax-container {
  overflow: hidden;
  position: relative;
}

/* ===== 6. 导航栏动画 ===== */
.nav-link-animate {
  position: relative;
}

.nav-link-animate::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
  transition: width var(--duration-normal) var(--ease-out),
              left var(--duration-normal) var(--ease-out);
}

.nav-link-animate:hover::after,
.nav-link-animate.active::after {
  width: 60%;
  left: 20%;
}

/* 移动端菜单动画 */
.nav-mobile-toggle {
  transition: transform var(--duration-normal) var(--ease-out);
}

.nav-mobile-toggle:active {
  transform: scale(0.9);
}

/* ===== 7. 页面切换过渡 ===== */
/* 淡出当前页 */
.page-fade-out {
  animation: pageFadeOut 0.3s var(--ease-out) forwards;
}

@keyframes pageFadeOut {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-10px);
  }
}

/* 淡入新页 */
.page-fade-in {
  animation: pageFadeIn 0.4s var(--ease-out) forwards;
}

@keyframes pageFadeIn {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 8. 特殊效果 ===== */
/* 打字机效果 */
.typewriter {
  overflow: hidden;
  white-space: nowrap;
  animation: typing 2s steps(20) forwards;
}

@keyframes typing {
  from { width: 0; }
  to { width: 100%; }
}

/* 渐变文字 */
.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 闪烁效果 */
.blink {
  animation: blink 1s step-start infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* ===== 9. 减少动画 (无障碍) ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .fade-in,
  .fade-in-up,
  .fade-in-down,
  .fade-in-left,
  .fade-in-right,
  .fade-in-scale,
  .scroll-reveal,
  .scroll-slide-left,
  .scroll-slide-right,
  .scroll-zoom,
  .scroll-flip {
    opacity: 1;
    transform: none;
  }
}

/* ===== 10. 移动端优化 ===== */
@media (max-width: 768px) {
  .fade-in,
  .fade-in-up,
  .fade-in-down,
  .scroll-reveal,
  .scroll-slide-left,
  .scroll-slide-right {
    transform: translateY(20px);
  }
  
  .scroll-zoom {
    transform: scale(0.95);
  }
  
  .card-hover:hover {
    transform: translateY(-3px);
  }
  
  .card-3d-hover:hover {
    transform: translateY(-4px);
  }
}

/* ===== 11. 加载状态动画 ===== */
.loading-dots::after {
  content: '';
  animation: loadingDots 1.5s infinite;
}

@keyframes loadingDots {
  0% { content: ''; }
  25% { content: '.'; }
  50% { content: '..'; }
  75% { content: '...'; }
}

/* 脉冲加载 */
.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(0.98);
  }
}

/* 旋转加载 */
.spin {
  animation: spin 1s linear infinite;
}

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