/* 全局重置与基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
}

:root {
  /* 主题色 */
  --primary-color: #4299e1;
  --secondary-color: #38bdf8;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --hover-color: #eff6ff;
  /* 过渡动画 */
  --transition: all 0.3s ease;
}

/* 暗色模式（可选扩展） */
[data-theme="dark"] {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --hover-color: #273449;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  padding-left: 120px; /* 为左侧侧边栏预留空间 */
  padding-top: 80px; /* 为固定header预留空间 */
  min-height: 100vh;
}

/* 左侧侧边栏 */
.sidebar-nav {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 120px;
  background-color: var(--card-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 998;
}

.sidebar-nav-list {
  list-style: none;
  width: 100%;
  padding: 2rem 0;
}

.sidebar-nav-item {
  margin: 1.5rem 0;
  text-align: center;
}

.sidebar-nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.8rem 1rem;
  display: block;
  border-radius: 8px;
  transition: var(--transition);
}

.sidebar-nav-link.active,
.sidebar-nav-link:hover {
  color: var(--primary-color);
  background-color: var(--hover-color);
}
/* 顶部导航激活高亮 */
.nav-link.active {
  color: var(--primary-color);
  background-color: var(--hover-color);
}

/* 顶部Header（固定） */
header {
  position: fixed;
  top: 0;
  left: 120px;
  right: 0;
  height: 80px;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 999;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.home-btn {
  color: var(--primary-color);
  font-size: 1.5rem;
  text-decoration: none;
  transition: var(--transition);
}

.home-btn:hover {
  color: var(--secondary-color);
  transform: scale(1.05);
}

.title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.theme-toggle {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--primary-color);
  background-color: var(--hover-color);
}

/* 顶部分类导航 */
.category-nav {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: var(--transition);
}

.nav-link.active,
.nav-link:hover {
  color: var(--primary-color);
  background-color: var(--hover-color);
}

/* 主内容区域 */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

.software-category {
  display: none;
}

.software-category.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.category-name {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
  display: inline-block;
}

/* 卡片网格基础样式 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.software-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.software-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.05);
  border-color: var(--primary-color);
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-color);
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.card-link {
  color: var(--secondary-color);
  font-size: 0.9rem;
  margin-top: auto;
}

/* 写作软件子分类样式 */
.writing-subcategory {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.recommend-section,
.other-section {
  flex: 1;
  min-width: 300px;
}

.subcategory-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.recommend-card-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.recommend-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition);
}

.recommend-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.05);
  border-color: var(--primary-color);
}

.other-card-container {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.other-card {
  background-color: var(--card-bg);
  border-radius: 8px;
  padding: 1rem;
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--text-primary);
  transition: var(--transition);
}

.other-card:hover {
  background-color: var(--hover-color);
  border-color: var(--primary-color);
}

/* 套餐容器样式 */
.package-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.package {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
}

.package-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.package-desc {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

/* 页脚样式 */
.global-footer {
  background-color: var(--card-bg);
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  text-align: center;
  margin-top: 3rem;
}

.footer-title {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.footer-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* 响应式适配 */
@media (max-width: 992px) {
  .sidebar-nav {
    display: none;
  }

  body {
    padding-left: 0;
  }

  header {
    left: 0;
  }

  .package-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  header {
    padding: 0 1rem;
    height: 70px;
  }

  .title {
    font-size: 1.2rem;
  }

  .category-nav {
    padding: 0 1rem;
  }

  .nav-list {
    overflow-x: auto;
    padding-bottom: 0.5rem;
  }

  main {
    padding: 1rem;
  }

  .writing-subcategory {
    flex-direction: column;
    gap: 1.5rem;
  }
}