/* 
 * 数学可视化平台 - 动画效果
 * 为界面添加轻量级现代交互动画
 */

/* 全局过渡效果 */
* {
  transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
}

/* 页面载入动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-section, .experiment-list, .about-section, .contact-section {
  animation: fadeInUp 0.8s ease forwards;
}

.experiment-list {
  animation-delay: 0.2s;
}

.about-section {
  animation-delay: 0.4s;
}

.contact-section {
  animation-delay: 0.6s;
}

/* 导航栏动画 */
.nav-logo {
  position: relative;
  overflow: hidden;
}

.nav-logo i {
  display: inline-block;
  transition: transform 0.5s ease;
}

.nav-logo:hover i {
  transform: rotate(360deg);
}

/* 实验卡片悬停效果 */
.experiment-card {
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.experiment-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 20px rgba(0,0,0,0.15);
}

.experiment-placeholder i {
  transition: transform 0.5s ease, color 0.5s ease;
}

.experiment-card:hover .experiment-placeholder i {
  transform: scale(1.2);
  color: var(--primary-color);
}

/* 按钮动画 */
.experiment-button, .btn, .contact-link {
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.experiment-button::after, .btn::after, .contact-link::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background-color: rgba(255,255,255,0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.5s ease, height 0.5s ease;
  z-index: 0;
}

.experiment-button:hover::after, .btn:hover::after, .contact-link:hover::after {
  width: 300px;
  height: 300px;
}

.experiment-button span, .btn span, .contact-link span, 
.experiment-button i, .btn i, .contact-link i {
  position: relative;
  z-index: 1;
}

/* 特性卡片动画 */
.feature-item {
  transition: transform 0.4s ease, box-shadow 0.4s ease, background-color 0.4s ease;
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 15px rgba(0,0,0,0.1);
  background-color: rgba(51, 102, 204, 0.03);
}

.feature-icon {
  transition: transform 0.5s ease;
}

.feature-item:hover .feature-icon {
  transform: scale(1.15);
}

/* 联系卡片动画 */
.contact-image {
  transition: transform 0.5s ease, box-shadow 0.5s ease;
}

.contact-card:hover .contact-image {
  transform: scale(1.05);
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* 滚动动画效果 */
@media (prefers-reduced-motion: no-preference) {
  .scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
  }
  
  .scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 微信按钮特效 */
#wechat-btn {
  position: relative;
  overflow: hidden;
}

#wechat-btn::before {
  content: '';
  position: absolute;
  top: -100%;
  left: -100%;
  width: 50%;
  height: 50%;
  background: linear-gradient(to bottom right, rgba(255,255,255,0.3), transparent);
  transform: rotate(45deg);
  transition: all 0.6s ease;
}

#wechat-btn:hover::before {
  top: 100%;
  left: 100%;
}

/* 卡片内容悬停效果 */
.description-card, .explanation-card {
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.description-card:hover, .explanation-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.08);
}

/* 画布容器悬停效果 */
.canvas-container {
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.canvas-container:hover {
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* 控制面板悬停效果 */
.controls-panel {
  transition: box-shadow 0.4s ease;
}

.controls-panel:hover {
  box-shadow: 0 3px 10px rgba(0,0,0,0.08);
}

/* 标签切换动画 */
.nav-tabs .nav-link {
  position: relative;
}

.nav-tabs .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  background-color: var(--primary-color);
  transition: width 0.3s ease, left 0.3s ease;
}

.nav-tabs .nav-link:hover::after {
  width: 100%;
  left: 0;
}

.nav-tabs .nav-link.active::after {
  width: 100%;
  left: 0;
}

/* 加载中动画 */
@keyframes pulse {
  0% {
    transform: scale(0.95);
    opacity: 0.7;
  }
  50% {
    transform: scale(1);
    opacity: 1;
  }
  100% {
    transform: scale(0.95);
    opacity: 0.7;
  }
}

.loading {
  animation: pulse 1.5s infinite ease-in-out;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: #bbb;
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: #999;
}

/* 实用动画类 */
.shake {
  animation: shake 0.82s cubic-bezier(.36,.07,.19,.97) both;
  transform: translate3d(0, 0, 0);
}

@keyframes shake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}

.pulse {
  animation: pulse 2s infinite;
}

.rotate {
  animation: rotate 2s infinite linear;
}

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