/* 全局样式文件 - 响应式设计和动画效果 */

/* 字体导入 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;600;700&display=swap');

/* 全局重置和基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-white: #FFFFFF;
  --color-light-gray: #F5F5F5;
  --color-beige: #F8F6F3;
  --color-gray: #E5E5E5;
  --color-dark-gray: #666666;
  --color-text: #333333;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  color: var(--color-text);
  background-color: var(--color-white);
  line-height: 1.8;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Noto Serif SC', serif;
  font-weight: 500;
  letter-spacing: 0.05em;
}

/* 导航栏样式 */
.nav-link {
  position: relative;
  transition: var(--transition-smooth);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 1px;
  background-color: var(--color-text);
  transition: var(--transition-smooth);
  transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* 轮播图样式 */
.carousel-container {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.carousel-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.carousel-slide.active {
  opacity: 1;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.carousel-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--color-white);
  z-index: 10;
  background-color: rgba(0, 0, 0, 0.3);
  padding: 2rem 4rem;
  backdrop-filter: blur(5px);
}

/* 图片悬停效果 */
.image-hover {
  overflow: hidden;
  transition: var(--transition-smooth);
}

.image-hover img {
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.image-hover:hover img {
  transform: scale(1.03);
}

.image-hover:hover {
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* 淡入动画 */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* 网格布局动画 */
.grid-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.grid-item.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 瀑布流布局 */
.masonry-grid {
  column-count: 3;
  column-gap: 2rem;
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 2rem;
}

/* 时间线布局 */
.timeline-item {
  position: relative;
  padding-left: 3rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background-color: var(--color-gray);
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: -4px;
  top: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-text);
}

/* 滚动到顶部按钮 */
.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  z-index: 1000;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-to-top:hover {
  background-color: var(--color-text);
  color: var(--color-white);
  transform: translateY(-5px);
}

/* 响应式设计 - 平板端 */
@media (max-width: 1199px) {
  .masonry-grid {
    column-count: 2;
  }
  
  .carousel-overlay {
    padding: 1.5rem 3rem;
  }
}

/* 响应式设计 - 手机端 */
@media (max-width: 767px) {
  .masonry-grid {
    column-count: 1;
  }
  
  .carousel-container {
    height: 60vh;
  }
  
  .carousel-overlay {
    padding: 1rem 2rem;
  }
  
  .timeline-item {
    padding-left: 2rem;
  }
  
  .scroll-to-top {
    width: 40px;
    height: 40px;
    bottom: 1rem;
    right: 1rem;
  }
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--color-gray);
  border-top-color: var(--color-text);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* 页脚样式 */
footer {
  border-top: 1px solid var(--color-gray);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-dark-gray);
}