/* 全局样式重置与基础配置 */
:root {
  --color-primary: #1a1a1a;
  --color-secondary: #2d3748;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-bg: #ffffff;
  --color-bg-alt: #f7f7f7;
  --color-border: #e5e5e5;
  --color-accent: #2c5282;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 导航栏样式 */
.nav-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: var(--transition-base);
}

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

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

.nav-links a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  position: relative;
  transition: var(--transition-base);
}

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

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

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

/* 主视觉区域 */
.hero-section {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: 60px;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, rgba(0,0,0,0.3), rgba(0,0,0,0.5));
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  color: white;
  max-width: 800px;
  padding: 0 var(--spacing-md);
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 300;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.5rem);
  font-weight: 300;
  letter-spacing: 0.05em;
  opacity: 0.9;
  animation: fadeInUp 1s ease-out 0.2s backwards;
}

/* 内容容器 */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
}

.section-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-light);
  font-weight: 300;
  line-height: 1.8;
  max-width: 800px;
}

/* 引言区块 */
.intro-section {
  background: var(--color-bg-alt);
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.intro-content {
  max-width: 900px;
  margin: 0 auto;
}

.intro-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 400;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.intro-text {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--color-text-light);
  line-height: 2;
  letter-spacing: 0.02em;
}

/* 快速导览区 */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.preview-card {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/5;
  border-radius: 2px;
  cursor: pointer;
  transition: var(--transition-base);
}

.preview-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.preview-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.preview-card:hover .preview-image {
  transform: scale(1.05);
}

.preview-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  color: white;
}

.preview-title {
  font-size: 1.5rem;
  font-weight: 400;
  margin-bottom: var(--spacing-xs);
}

.preview-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: white;
  text-decoration: none;
  font-size: 0.95rem;
  opacity: 0.9;
  transition: var(--transition-base);
}

.preview-link:hover {
  opacity: 1;
  transform: translateX(4px);
}

/* 图集展示 - 瀑布流 */
.gallery-masonry {
  column-count: 3;
  column-gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.gallery-item {
  break-inside: avoid;
  margin-bottom: var(--spacing-md);
  position: relative;
  overflow: hidden;
  border-radius: 2px;
  cursor: pointer;
}

.gallery-image {
  width: 100%;
  display: block;
  transition: transform 0.5s ease;
}

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

.gallery-caption {
  padding: var(--spacing-sm);
  background: var(--color-bg);
}

.gallery-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-xs);
}

.gallery-description {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* 图集展示 - 网格 */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.detail-item {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 2px;
  background: var(--color-bg-alt);
}

.detail-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease, filter 0.3s ease;
}

.detail-item:hover .detail-image {
  transform: scale(1.05);
  filter: brightness(1.05);
}

.detail-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-sm);
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  color: white;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.detail-item:hover .detail-info {
  transform: translateY(0);
}

.detail-tag {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.detail-text {
  font-size: 0.9rem;
  line-height: 1.5;
  opacity: 0.95;
}

/* 结尾文字区块 */
.closing-section {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  background: var(--color-bg-alt);
  margin-top: var(--spacing-xl);
}

.closing-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 400;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

.closing-text {
  max-width: 800px;
  margin: 0 auto;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--color-text-light);
  line-height: 2;
  letter-spacing: 0.02em;
}

/* 页脚 */
footer {
  text-align: center;
  padding: var(--spacing-md);
  color: var(--color-text-light);
  font-size: 0.9rem;
  border-top: 1px solid var(--color-border);
}

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

/* 响应式设计 */
@media (max-width: 1024px) {
  .gallery-masonry {
    column-count: 2;
  }
  
  .preview-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    gap: var(--spacing-sm);
  }
  
  .gallery-masonry {
    column-count: 1;
  }
  
  .gallery-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  .hero-section {
    min-height: 500px;
  }
  
  .container {
    padding: var(--spacing-md) var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .nav-links a {
    font-size: 0.85rem;
  }
  
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}