/* 全局样式变量 - 中性色调主题 */
:root {
  --primary-bg: #fafafa;
  --secondary-bg: #f5f5f5;
  --accent-bg: #ebebeb;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --morandi-pink: #e8d8d8;
  --morandi-blue: #d8e3e8;
  --morandi-green: #d8e3d8;
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.2);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

/* 重置与基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Source Han Sans SC', 'Noto Sans CJK SC', 'WenQuanYi Micro Hei', sans-serif;
  font-weight: 300;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--primary-bg);
  overflow-x: hidden;
}

/* 导航栏毛玻璃效果 */
.nav-glass {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: 1rem 2rem;
  transition: all 0.3s ease;
}

.nav-glass:hover {
  background: rgba(255, 255, 255, 0.95);
}

/* 导航链接悬停下划线动画 */
.nav-link {
  position: relative;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 300;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  transition: color 0.3s ease;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-primary);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* 响应式容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* 主视觉英雄区 */
.hero-section {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-image {
  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(180deg, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.4) 100%);
  z-index: -1;
}

.hero-content {
  text-align: center;
  color: white;
  z-index: 1;
  animation: fadeInUp 1.2s ease-out;
}

/* 卡片布局 */
.preview-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 4rem 0;
}

.card {
  background: white;
  border-radius: 4px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

.card-content {
  padding: 1.5rem;
}

.card-title {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

/* 瀑布流布局 */
.masonry-grid {
  columns: 3 300px;
  column-gap: 2rem;
  padding: 2rem 0;
}

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

.masonry-image {
  width: 100%;
  border-radius: 4px;
  transition: opacity 0.3s ease;
}

.masonry-image:hover {
  opacity: 0.9;
}

/* 交替布局 */
.alternate-section {
  display: flex;
  align-items: center;
  gap: 4rem;
  padding: 4rem 0;
  margin: 4rem 0;
}

.alternate-section:nth-child(even) {
  flex-direction: row-reverse;
}

.alternate-image {
  flex: 1;
  border-radius: 4px;
  overflow: hidden;
}

.alternate-content {
  flex: 1;
}

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

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.8s ease-out forwards;
}

/* 视差滚动 */
.parallax {
  transform: translateZ(0);
  will-change: transform;
}

/* 页脚 */
footer {
  border-top: 1px solid var(--accent-bg);
  background: var(--secondary-bg);
  padding: 2rem 0;
  text-align: center;
  margin-top: 6rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.3s ease;
}

.footer-link:hover {
  color: var(--text-secondary);
}

.copyright {
  color: var(--text-muted);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .nav-glass {
    padding: 1rem;
  }
  
  .preview-cards {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .masonry-grid {
    columns: 1;
    column-gap: 1rem;
  }
  
  .alternate-section {
    flex-direction: column;
    gap: 2rem;
  }
  
  .alternate-section:nth-child(even) {
    flex-direction: column;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 0.5rem;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .hero-content p {
    font-size: 1rem;
  }
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: transparent;
  border: 1px solid var(--text-primary);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 300;
  letter-spacing: 0.1em;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn:hover {
  background: var(--text-primary);
  color: white;
  transform: translateY(-2px);
}

/* 标题样式 */
h1 {
  font-size: 3rem;
  font-weight: 200;
  letter-spacing: 0.05em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

/* 文本样式 */
p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

/* 间距工具类 */
.py-4 { padding-top: 4rem; padding-bottom: 4rem; }
.py-6 { padding-top: 6rem; padding-bottom: 6rem; }
.mb-4 { margin-bottom: 4rem; }
.mb-6 { margin-bottom: 6rem; }