/* 全局样式重置与变量定义 */
:root {
  --color-white: #FFFFFF;
  --color-light-gray: #F8F9FA;
  --color-dark-gray: #2C3E50;
  --color-black: #000000;
  --color-text-secondary: #888888;
  --color-divider: #EAEAEA;
  
  --font-size-title: 48px;
  --font-size-subtitle: 30px;
  --font-size-body: 18px;
  --font-size-small: 14px;
  
  --spacing-xs: 10px;
  --spacing-sm: 20px;
  --spacing-md: 40px;
  --spacing-lg: 60px;
  --spacing-xl: 80px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.4s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: var(--font-size-body);
  line-height: 1.7;
  color: var(--color-dark-gray);
  background-color: var(--color-white);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

a:hover {
  opacity: 0.7;
}

/* 顶部导航栏 */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-divider);
}

.nav-logo {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-black);
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-links a {
  font-size: 16px;
  font-weight: 400;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-black);
  transition: width var(--transition-fast);
}

.nav-links a:hover::after {
  width: 100%;
}

/* 主内容区域 */
.main-content {
  margin-top: 70px;
}

/* 全屏轮播图 */
.hero-slider {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

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

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

.hero-text {
  position: absolute;
  bottom: var(--spacing-xl);
  left: var(--spacing-md);
  color: var(--color-white);
  font-size: var(--font-size-subtitle);
  font-weight: 300;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.slider-controls {
  position: absolute;
  bottom: var(--spacing-sm);
  right: var(--spacing-md);
  display: flex;
  gap: var(--spacing-xs);
}

.slider-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.slider-dot.active {
  background-color: var(--color-white);
}

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 50px;
  border: 2px solid rgba(255, 255, 255, 0.8);
  border-radius: 20px;
  cursor: pointer;
}

.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 2px;
  animation: scroll-down 1.5s infinite;
}

@keyframes scroll-down {
  0%, 100% {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
  }
  50% {
    transform: translateX(-50%) translateY(10px);
    opacity: 0;
  }
}

/* 区块容器 */
.section {
  padding: var(--spacing-xl) var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  font-size: var(--font-size-title);
  font-weight: 300;
  color: var(--color-black);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.section-subtitle {
  font-size: var(--font-size-subtitle);
  font-weight: 300;
  color: var(--color-dark-gray);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

/* 网格布局 */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  align-items: center;
}

/* 卡片样式 */
.card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-normal);
}

.card:hover {
  transform: scale(1.03);
}

.card img {
  width: 100%;
  transition: transform var(--transition-normal);
}

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

.card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-sm);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  color: var(--color-white);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover .card-overlay {
  opacity: 1;
}

.card-title {
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 10px;
}

.card-description {
  font-size: var(--font-size-small);
  line-height: 1.5;
}

/* 筛选器 */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.filter-tag {
  padding: 10px 20px;
  border: 1px solid var(--color-divider);
  border-radius: 30px;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 16px;
}

.filter-tag:hover,
.filter-tag.active {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

/* 页脚 */
.footer {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  border-top: 1px solid var(--color-divider);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
}

/* 响应式设计 */
@media (max-width: 1199px) {
  :root {
    --font-size-title: 40px;
    --font-size-subtitle: 26px;
    --spacing-md: 30px;
    --spacing-lg: 50px;
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  :root {
    --font-size-title: 32px;
    --font-size-subtitle: 22px;
    --font-size-body: 16px;
    --spacing-sm: 15px;
    --spacing-md: 20px;
    --spacing-lg: 40px;
  }
  
  .nav-header {
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
  }
  
  .nav-links {
    gap: var(--spacing-sm);
  }
  
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .hero-text {
    font-size: 20px;
    left: var(--spacing-sm);
    bottom: var(--spacing-md);
  }
  
  .section {
    padding: var(--spacing-md) var(--spacing-sm);
  }
}

/* 图片懒加载占位 */
.lazy-img {
  background-color: var(--color-light-gray);
  min-height: 400px;
}

/* 文本内容 */
.text-content {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
  color: var(--color-dark-gray);
}

.text-content p {
  margin-bottom: var(--spacing-sm);
}

/* 色彩板 */
.color-palette {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin: var(--spacing-md) 0;
}

.color-item {
  text-align: center;
}

.color-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto var(--spacing-xs);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.color-name {
  font-size: var(--font-size-small);
  color: var(--color-dark-gray);
}

/* 视觉故事模块 */
.visual-story {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: var(--spacing-sm) 0;
}

.visual-story img {
  height: 400px;
  width: auto;
  object-fit: cover;
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-light-gray);
  border-top-color: var(--color-black);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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