/* 基础样式 */
:root {
  --primary-color: #ff6b35;
  --secondary-color: #f7c59f;
  --dark-color: #2b2d42;
  --light-color: #edf2f4;
  --accent-color: #5e60ce;
  --text-color: #333;
  --text-light: #666;
  --border-color: #ddd;
  --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  background-color: #f8f9fa;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

.section {
  padding: 60px 0;
}

.section h2 {
  font-size: 28px;
  text-align: center;
  margin-bottom: 10px;
  color: var(--dark-color);
}

.section-desc {
  text-align: center;
  color: var(--text-light);
  margin-bottom: 30px;
  font-size: 16px;
}

.bg-light {
  background-color: var(--light-color);
}

/* 导航栏样式 */
header {
  background-color: var(--dark-color);
  color: white;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
}

.logo a {
  font-size: 22px;
  font-weight: bold;
  color: var(--secondary-color);
}

nav ul {
  display: flex;
}

nav ul li {
  margin-left: 20px;
}

nav ul li a {
  padding: 5px 10px;
  border-radius: 4px;
  font-weight: 500;
}

nav ul li a:hover {
  color: var(--primary-color);
  background-color: rgba(255, 255, 255, 0.1);
}

/* 横幅样式 */
.banner {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  text-align: center;
  padding: 80px 0;
}

.banner h1 {
  font-size: 36px;
  margin-bottom: 15px;
}

.banner .subtitle {
  font-size: 18px;
  margin-bottom: 30px;
  opacity: 0.9;
}

.search-box {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
}

.search-box input {
  flex: 1;
  padding: 12px 15px;
  border: none;
  border-radius: 4px 0 0 4px;
  font-size: 16px;
}

.search-box button {
  padding: 12px 25px;
  background-color: var(--dark-color);
  color: white;
  border: none;
  border-radius: 0 4px 4px 0;
  cursor: pointer;
  font-size: 16px;
  transition: var(--transition);
}

.search-box button:hover {
  background-color: #1a1b29;
}

/* 卡片样式 */
.card-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.card {
  background-color: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.card-img {
  position: relative;
  height: 0;
  padding-top: 140%; /* 宽高比 */
  overflow: hidden;
}

.card-img img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.card-content {
  padding: 15px;
}

.card-content h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--dark-color);
}

.card-content p {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 10px;
}

.tag {
  display: inline-block;
  padding: 3px 8px;
  background-color: var(--secondary-color);
  color: var(--dark-color);
  border-radius: 3px;
  font-size: 12px;
  margin-right: 5px;
}

/* 分类样式 */
.category-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 25px;
}

.category-item {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  height: 200px;
  box-shadow: var(--card-shadow);
}

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

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

.category-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 15px;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  color: white;
}

.category-content h3 {
  font-size: 20px;
  margin-bottom: 5px;
}

.category-content p {
  font-size: 14px;
  opacity: 0.9;
}

/* 文章样式 */
.article-container {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.article-item {
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--card-shadow);
}

.article-item h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--dark-color);
}

.article-meta {
  color: var(--text-light);
  font-size: 14px;
  margin-bottom: 15px;
}

.article-item p {
  color: var(--text-color);
  line-height: 1.8;
  text-align: justify;
}

/* 页脚样式 */
footer {
  background-color: var(--dark-color);
  color: white;
  padding: 60px 0 20px;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-logo {
  flex: 1;
  min-width: 250px;
}

.footer-logo h3 {
  font-size: 20px;
  margin-bottom: 15px;
  color: var(--secondary-color);
}

.footer-links {
  flex: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}

.link-group h4 {
  font-size: 16px;
  margin-bottom: 15px;
  color: var(--secondary-color);
}

.link-group ul li {
  margin-bottom: 10px;
}

.link-group ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.link-group ul li a:hover {
  color: white;
}

.copyright {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
}

.copyright p {
  margin-bottom: 10px;
}

/* 响应式设计 */
@media (max-width: 768px) {
  header .container {
    flex-direction: column;
  }
  
  nav ul {
    margin-top: 15px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  nav ul li {
    margin: 5px;
  }
  
  .banner {
    padding: 50px 0;
  }
  
  .banner h1 {
    font-size: 28px;
  }
  
  .section {
    padding: 40px 0;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 30px;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .card-container {
    grid-template-columns: 1fr;
  }
  
  .category-container {
    grid-template-columns: 1fr;
  }
  
  .banner h1 {
    font-size: 24px;
  }
  
  .search-box {
    flex-direction: column;
  }
  
  .search-box input,
  .search-box button {
    width: 100%;
    border-radius: 4px;
  }
  
  .search-box button {
    margin-top: 10px;
  }
}