/* 全局样式定义 */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f8f8;
  --color-primary: #333333;
  --color-secondary: #666666;
  --color-muted: #999999;
  --color-accent: #000000;
  --font-family: "Noto Sans SC", "PingFang SC", "Helvetica Neue", "Helvetica", "Arial", sans-serif;
  --border-radius: 4px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--color-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 导航栏样式 */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1rem 2rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

nav a {
  text-decoration: none;
  color: var(--color-primary);
  font-size: 0.95rem;
  font-weight: 400;
  position: relative;
  transition: var(--transition);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

/* 主要内容区域 */
main {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* 英雄区域 */
.hero {
  height: 90vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
  animation: subtle-zoom 20s infinite alternate;
}

@keyframes subtle-zoom {
  0% { transform: scale(1); }
  100% { transform: scale(1.05); }
}

.hero-content {
  text-align: center;
  color: white;
  z-index: 1;
  padding: 2rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 200;
  letter-spacing: 0.2em;
  margin-bottom: 1rem;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

/* 精选系列 */
.featured {
  padding: 5rem 0;
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.featured-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius);
  cursor: pointer;
  background: var(--bg-secondary);
}

.featured-card img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  transition: var(--transition);
}

.featured-card:hover img {
  transform: scale(1.05);
  filter: brightness(0.9);
}

.featured-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  padding: 3rem 2rem 2rem;
  transform: translateY(100%);
  transition: var(--transition);
}

.featured-card:hover .featured-overlay {
  transform: translateY(0);
}

.featured-overlay h3 {
  color: white;
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 0.05em;
}

/* 引导区域 */
.cta {
  text-align: center;
  padding: 4rem 0;
  background: var(--bg-secondary);
}

.cta p {
  font-size: 1.2rem;
  color: var(--color-secondary);
  margin-bottom: 2rem;
  font-weight: 300;
}

.cta a {
  display: inline-block;
  padding: 1rem 3rem;
  background: var(--color-accent);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: var(--transition);
  letter-spacing: 0.1em;
}

.cta a:hover {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

/* 页面标题 */
.page-title {
  text-align: center;
  padding: 4rem 0;
}

.page-title h1 {
  font-size: 3rem;
  font-weight: 200;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

/* 网格布局 */
.grid {
  display: grid;
  gap: 2rem;
  padding: 2rem 0;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* 卡片样式 */
.card {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
}

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

.card img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.card-content {
  padding: 1.5rem;
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 400;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
}

.card p {
  color: var(--color-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 筛选按钮 */
.filter-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  padding: 2rem 0;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1.5rem;
  background: transparent;
  border: 1px solid var(--color-muted);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.95rem;
}

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

/* 图片画廊 */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 2rem 0;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius);
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  transition: var(--transition);
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-overlay span {
  color: white;
  font-size: 1.1rem;
  font-weight: 300;
  letter-spacing: 0.05em;
}

/* 文章列表 */
.article-list {
  padding: 2rem 0;
}

.article-item {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  margin-bottom: 4rem;
  align-items: center;
}

.article-item img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  border-radius: var(--border-radius);
}

.article-content h2 {
  font-size: 2rem;
  font-weight: 300;
  margin-bottom: 1rem;
  color: var(--color-accent);
  letter-spacing: 0.05em;
}

.article-content p {
  color: var(--color-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.article-content a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.article-content a:hover {
  border-bottom-color: var(--color-accent);
}

/* 关于页面 */
.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  padding: 4rem 0;
}

.about-content h2 {
  font-size: 2.5rem;
  font-weight: 200;
  margin-bottom: 2rem;
  color: var(--color-accent);
  letter-spacing: 0.1em;
}

.about-content p {
  font-size: 1.1rem;
  line-height: 2;
  color: var(--color-secondary);
  margin-bottom: 1.5rem;
}

/* 页脚 */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--color-muted);
  font-size: 0.9rem;
  background: var(--bg-secondary);
  margin-top: 4rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  nav ul {
    gap: 1rem;
    font-size: 0.9rem;
  }
  
  .featured-grid {
    grid-template-columns: 1fr;
  }
  
  .article-item {
    grid-template-columns: 1fr;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .container {
    padding: 0 1rem;
  }
}

@media (max-width: 480px) {
  header {
    padding: 1rem;
  }
  
  nav {
    flex-direction: column;
    gap: 1rem;
  }
  
  main {
    margin-top: 120px;
  }
  
  .gallery {
    grid-template-columns: 1fr;
  }
}

/* 动画效果 */
.fade-in {
  animation: fadeIn 0.8s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-secondary);
}