/* 全局变量定义 */
:root {
  --color-white: #FFFFFF;
  --color-light-gray: #F8F8F8;
  --color-dark-gray: #333333;
  --color-mid-gray: #666666;
  --transition-smooth: all 0.3s ease;
  --transition-scale: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Source Han Sans CN', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  color: var(--color-dark-gray);
  background-color: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 导航栏样式 */
.nav-transparent {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  transition: var(--transition-smooth);
}

.nav-link {
  position: relative;
  transition: var(--transition-smooth);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-dark-gray);
  transition: width 0.3s ease;
}

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

/* 轮播图容器 */
.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;
  z-index: 1;
}

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

.carousel-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.1), rgba(0,0,0,0.3));
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 80px;
  z-index: 2;
}

.carousel-text {
  color: var(--color-white);
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 2px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 轮播指示器 */
.carousel-indicators {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 3;
}

.indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: rgba(255,255,255,0.5);
  border: 1px solid rgba(255,255,255,0.8);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.indicator.active {
  background-color: var(--color-white);
  width: 24px;
  border-radius: 4px;
}

/* 悬停缩放效果 */
.hover-scale {
  overflow: hidden;
  transition: var(--transition-scale);
  cursor: pointer;
}

.hover-scale img {
  transition: var(--transition-scale);
}

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

/* 图片网格 */
.image-grid {
  display: grid;
  gap: 24px;
}

.grid-item {
  position: relative;
  overflow: hidden;
  background-color: var(--color-light-gray);
}

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-scale);
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition-smooth);
}

.grid-item:hover .grid-overlay {
  background: rgba(0,0,0,0.3);
  opacity: 1;
}

.grid-overlay-text {
  color: var(--color-white);
  font-size: 1.125rem;
  font-weight: 300;
  letter-spacing: 1px;
  transform: translateY(10px);
  transition: var(--transition-smooth);
}

.grid-item:hover .grid-overlay-text {
  transform: translateY(0);
}

/* 系列导航 */
.series-nav {
  position: sticky;
  top: 64px;
  background-color: var(--color-white);
  z-index: 40;
  border-bottom: 1px solid var(--color-light-gray);
}

.series-link {
  position: relative;
  padding: 16px 24px;
  color: var(--color-mid-gray);
  transition: var(--transition-smooth);
  cursor: pointer;
}

.series-link:hover,
.series-link.active {
  color: var(--color-dark-gray);
}

.series-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-dark-gray);
  transition: width 0.3s ease;
}

.series-link.active::after {
  width: 100%;
}

/* 图片遮罩加载效果 */
.img-loading {
  background: linear-gradient(90deg, var(--color-light-gray) 25%, #e8e8e8 50%, var(--color-light-gray) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background-color: var(--color-dark-gray);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  z-index: 50;
}

.back-to-top.visible {
  opacity: 0.8;
  visibility: visible;
}

.back-to-top:hover {
  opacity: 1;
  transform: translateY(-4px);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .carousel-text {
    font-size: 1.5rem;
    padding: 0 20px;
  }

  .image-grid {
    gap: 16px;
  }

  .series-link {
    padding: 12px 16px;
    font-size: 0.875rem;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 640px) {
  .carousel-text {
    font-size: 1.25rem;
  }

  .grid-overlay-text {
    font-size: 0.875rem;
  }
}

/* 视差滚动效果 */
.parallax {
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

/* 淡入动画 */
.fade-in {
  opacity: 0;
  animation: fadeIn 0.8s ease-out forwards;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

/* 延迟动画类 */
.delay-100 {
  animation-delay: 0.1s;
}

.delay-200 {
  animation-delay: 0.2s;
}

.delay-300 {
  animation-delay: 0.3s;
}