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

/* 根元素变量定义 */
:root {
  /* 色彩系统 */
  --primary-color: #000000;
  --secondary-color: #ffffff;
  --accent-color: #c0a080;
  --text-color: #333333;
  --text-light: #666666;
  --background: #fafafa;
  
  /* 间距系统 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  
  /* 字体系统 */
  --font-family: 'Helvetica Neue', Arial, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 2rem;
  --font-size-2xl: 3rem;
  
  /* 过渡动画 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* 基础样式 */
body {
  font-family: var(--font-family);
  color: var(--text-color);
  background-color: var(--secondary-color);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: var(--spacing-sm) 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: var(--transition-normal);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: var(--font-size-lg);
  font-weight: 300;
  letter-spacing: 2px;
  color: var(--primary-color);
  text-decoration: none;
}

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

.nav-link {
  color: var(--text-color);
  text-decoration: none;
  font-size: var(--font-size-base);
  transition: var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--accent-color);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent-color);
  transition: var(--transition-fast);
}

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

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.hamburger span {
  width: 25px;
  height: 2px;
  background-color: var(--primary-color);
  transition: var(--transition-fast);
}

/* 英雄区域 */
.hero {
  height: 100vh;
  min-height: 600px;
  background-image: url('https://hpi-hub.tos-cn-beijing.volces.com/static/transparent/cHJpdmF0ZS9sci91748499220435-3577YjZfMi5wbmc.png');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
}

.hero-content {
  text-align: center;
  color: var(--secondary-color);
  z-index: 1;
  padding: var(--spacing-md);
}

.hero-title {
  font-size: var(--font-size-2xl);
  font-weight: 300;
  letter-spacing: 4px;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 1s ease;
}

.hero-subtitle {
  font-size: var(--font-size-base);
  font-weight: 300;
  opacity: 0.9;
  animation: fadeInUp 1s ease 0.2s both;
}

.cta-button {
  display: inline-block;
  margin-top: var(--spacing-lg);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--secondary-color);
  color: var(--secondary-color);
  text-decoration: none;
  transition: var(--transition-normal);
  animation: fadeInUp 1s ease 0.4s both;
}

.cta-button:hover {
  background-color: var(--secondary-color);
  color: var(--primary-color);
}

/* 内容区域 */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
}

.section-title {
  text-align: center;
  font-size: var(--font-size-xl);
  font-weight: 300;
  margin-bottom: var(--spacing-lg);
  letter-spacing: 2px;
}

/* 图片网格 */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.image-item {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition-normal);
}

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

.image-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  color: var(--secondary-color);
  padding: var(--spacing-md);
  transform: translateY(100%);
  transition: var(--transition-normal);
}

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

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

.image-title {
  font-size: var(--font-size-base);
  font-weight: 400;
  margin-bottom: var(--spacing-xs);
}

.image-description {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

/* 故事页面样式 */
.story-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.story-card {
  background-color: var(--background);
  overflow: hidden;
  transition: var(--transition-normal);
}

.story-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.story-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.story-content {
  padding: var(--spacing-md);
}

.story-title {
  font-size: var(--font-size-lg);
  font-weight: 400;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
}

.story-excerpt {
  font-size: var(--font-size-base);
  color: var(--text-light);
  line-height: 1.8;
}

/* 页脚 */
footer {
  background-color: var(--primary-color);
  color: var(--secondary-color);
  text-align: center;
  padding: var(--spacing-md) 0;
  font-size: var(--font-size-sm);
}

/* 动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.8s ease both;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(255, 255, 255, 0.98);
    flex-direction: column;
    justify-content: start;
    align-items: center;
    padding-top: var(--spacing-lg);
    transition: var(--transition-normal);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .hero-title {
    font-size: var(--font-size-xl);
  }
  
  .image-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-sm);
  }
  
  .story-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .container {
    padding: var(--spacing-md) var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-lg);
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-container {
    padding: 0 var(--spacing-sm);
  }
  
  .container {
    padding: var(--spacing-sm);
  }
}