/* 基础样式和变量定义 */
:root {
  /* 深色模式背景 */
  --bg-color: #1E1E1E;
  /* 新拟物化阴影 */
  --light-shadow: 10px 10px 20px rgba(0, 0, 0, 0.3), 
                  -10px -10px 20px rgba(60, 60, 60, 0.3);
  --light-shadow-inset: inset 5px 5px 10px rgba(0, 0, 0, 0.3), 
                        inset -5px -5px 10px rgba(60, 60, 60, 0.3);
  --dark-shadow: 5px 5px 10px rgba(0, 0, 0, 0.3), 
                 -5px -5px 10px rgba(60, 60, 60, 0.3);
  --dark-shadow-inset: inset 3px 3px 6px rgba(0, 0, 0, 0.3), 
                       inset -3px -3px 6px rgba(60, 60, 60, 0.3);
  /* 颜色定义 */
  --primary-color: #4A90E2;
  --secondary-color: #50E3C2;
  --accent-color: #F5A623;
  --text-color: #E0E0E0;
  --text-secondary: #B0B0B0;
  /* 圆角 */
  --border-radius: 20px;
  /* 过渡动画 */
  --transition: all 0.3s ease;
}

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  padding-bottom: 2rem;
}

/* 顶部导航栏 */
.navbar {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--bg-color);
  box-shadow: var(--light-shadow);
  border-radius: var(--border-radius);
  margin: 1rem;
  transition: var(--transition);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
}

.logo i {
  color: var(--primary-color);
}

/* 主容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}



/* 分类区域 */
.categories {
  margin: 2rem 0;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1.2rem;
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.2rem;
  border-radius: var(--border-radius);
  background: var(--bg-color);
  text-decoration: none;
  color: var(--text-color);
  box-shadow: var(--light-shadow);
  transition: var(--transition);
}

.category-card:hover {
  box-shadow: var(--light-shadow-inset);
  transform: translateY(-3px);
}

.category-icon {
  font-size: 1.8rem;
  margin-bottom: 0.8rem;
  color: var(--primary-color);
}

.category-name {
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
}

/* 链接区域 */
.links-section {
  margin: 2.5rem 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0 1.5rem;
  text-align: center;
  color: var(--text-color);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.link-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.2rem 0.8rem;
  border-radius: var(--border-radius);
  background: var(--bg-color);
  text-decoration: none;
  color: var(--text-color);
  box-shadow: var(--light-shadow);
  transition: var(--transition);
}

.link-card:hover {
  box-shadow: var(--light-shadow-inset);
  transform: translateY(-3px);
}

.link-icon {
  font-size: 1.6rem;
  margin-bottom: 0.7rem;
  color: var(--secondary-color);
}

.link-name {
  font-size: 0.85rem;
  font-weight: 500;
  text-align: center;
}



/* 页脚 */
.footer {
  text-align: center;
  margin-top: 2.5rem;
  padding: 1.5rem;
  background: var(--bg-color);
  border-radius: var(--border-radius);
  box-shadow: var(--light-shadow);
}

.footer p {
  margin-bottom: 0.8rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.2rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-secondary);
  transition: var(--transition);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--text-color);
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 4rem;
  height: 4rem;
  border: none;
  border-radius: 50%;
  background: var(--bg-color);
  color: var(--text-color);
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--light-shadow);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  box-shadow: var(--light-shadow-inset);
  transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    margin: 1rem;
  }
  
  .nav-menu {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .menu-toggle {
    display: block;
    position: absolute;
    top: 1rem;
    right: 1rem;
  }
  
  .search-container {
    flex-direction: column;
  }
  
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .actions-section {
    flex-direction: column;
    align-items: center;
  }
  
  .action-button {
    width: 80%;
    justify-content: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 0.75rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .links-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
}