/* Tailwind CSS已通过CDN引入，此处仅定义必要的全局样式 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@100;300;400;500;700&display=swap');

:root {
  /* 颜色系统 */
  --color-primary: #111111;
  --color-secondary: #666666;
  --color-accent: #9ca3af;
  --color-background: #ffffff;
  --color-surface: #f9fafb;
  
  /* 字体 */
  --font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  
  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  
  /* 过渡 */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-weight: 300;
  color: var(--color-primary);
  background-color: var(--color-background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 导航栏样式 */
.nav-link {
  position: relative;
  transition: var(--transition);
}

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

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

/* 图片悬停效果 */
.image-hover {
  overflow: hidden;
  cursor: pointer;
}

.image-hover img {
  transition: transform 0.5s ease;
}

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

/* 渐入动画 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.8s ease-out;
}

/* 瀑布流布局 */
.masonry {
  column-count: 3;
  column-gap: 1.5rem;
}

@media (max-width: 1024px) {
  .masonry {
    column-count: 2;
  }
}

@media (max-width: 640px) {
  .masonry {
    column-count: 1;
  }
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 1.5rem;
}

/* 按钮样式 */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-background);
  padding: var(--spacing-xs) var(--spacing-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 300;
  letter-spacing: 0.05em;
}

.btn-primary:hover {
  background-color: #000000;
  transform: translateY(-1px);
}

/* 标签样式 */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--color-surface);
  color: var(--color-secondary);
  font-size: 0.875rem;
  transition: var(--transition);
  cursor: pointer;
}

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

.tag.active {
  background-color: var(--color-primary);
  color: var(--color-background);
}

/* 卡片悬停效果 */
.card {
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* 英雄区文字样式 */
.hero-text {
  letter-spacing: 0.1em;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 页脚样式 */
footer {
  margin-top: var(--spacing-xl);
}

/* 汉堡菜单动画 */
.hamburger-line {
  transition: var(--transition);
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* 响应式辅助类 */
.container-fluid {
  width: 100%;
  padding-left: var(--spacing-sm);
  padding-right: var(--spacing-sm);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: var(--spacing-sm);
  padding-right: var(--spacing-sm);
}

/* 加载动画 */
@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 1000px 100%;
  animation: shimmer 2s infinite;
}