/* AI工具导航网站主样式表 */

/* CSS变量定义 */
:root {
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --accent-color: #f093fb;
  --background-color: #f8fafc;
  --surface-color: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --info-color: #3b82f6;
}

/* 基础重置和全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-color);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* 跳转链接（无障碍访问） */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 6px;
}

/* 头部导航 */
.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: 1rem 0;
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 50;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.navbar-brand .logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: white;
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 600;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.navbar-nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: white;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: background-color 0.3s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
  background-color: rgba(255, 255, 255, 0.1);
}

/* 搜索表单 */
.search-form {
  display: flex;
  position: relative;
}

.search-input {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 0.5rem 0 0 0.5rem;
  outline: none;
  min-width: 200px;
}

.search-button {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0 0.5rem 0.5rem 0;
  cursor: pointer;
  transition: background-color 0.3s;
}

.search-button:hover {
  background: #e879f9;
}

/* 移动菜单切换 */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background: white;
  margin: 3px 0;
  transition: 0.3s;
}

/* 面包屑导航 */
.breadcrumb-nav {
  background: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
}

.breadcrumb-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.breadcrumb-logo {
  opacity: 0.8;
  transition: opacity 0.3s;
}

.breadcrumb-logo:hover {
  opacity: 1;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
  content: '›';
  margin: 0 0.5rem;
  color: var(--text-secondary);
}

.breadcrumb-item a {
  color: var(--primary-color);
  text-decoration: none;
}

.breadcrumb-item a:hover {
  text-decoration: underline;
}

/* 主要内容区域 */
.main-content {
  min-height: calc(100vh - 200px);
  padding: 2rem 0;
}

/* Hero区域 */
.hero-section {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.gradient-text {
  background: linear-gradient(45deg, var(--accent-color), #fbbf24);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.search-form-large {
  max-width: 600px;
  margin: 0 auto 2rem;
  display: flex;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.search-input-large {
  flex: 1;
  padding: 1rem 1.5rem;
  border: none;
  border-radius: 0.75rem 0 0 0.75rem;
  font-size: 1.1rem;
  outline: none;
}

.search-button-large {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 1rem 2rem;
  border-radius: 0 0.75rem 0.75rem 0;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 600;
  transition: background-color 0.3s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-button-large:hover {
  background: #e879f9;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* 分类网格 */
.featured-categories {
  padding: 4rem 0;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.category-card {
  background: var(--surface-color);
  padding: 2rem;
  border-radius: 1rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform 0.3s, box-shadow 0.3s;
  border: 1px solid var(--border-color);
  text-align: center;
}

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.category-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.category-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.category-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.category-count {
  background: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.875rem;
  font-weight: 500;
}

/* 筛选区域 */
.filter-section {
  background: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
}

.filter-bar {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-select {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  background: white;
  outline: none;
}

.view-toggle {
  display: flex;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  overflow: hidden;
}

.view-btn {
  background: white;
  border: none;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: background-color 0.3s;
}

.view-btn.active {
  background: var(--primary-color);
  color: white;
}

.results-count {
  margin-left: auto;
  color: var(--text-secondary);
  font-weight: 500;
}

/* 应用网格 */
.apps-section {
  padding: 2rem 0;
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.apps-grid.list-view {
  grid-template-columns: 1fr;
}

.app-card {
  background: var(--surface-color);
  border-radius: 1rem;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  transition: transform 0.3s, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
}

.app-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.app-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.app-icon img {
  width: 64px;
  height: 64px;
  border-radius: 0.75rem;
  object-fit: cover;
}

.default-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
}

.app-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
}

.app-category {
  background: var(--info-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.app-price {
  background: var(--warning-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.app-price.free {
  background: var(--success-color);
}

.app-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.app-title a {
  color: var(--text-primary);
  text-decoration: none;
}

.app-title a:hover {
  color: var(--primary-color);
}

.app-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  flex: 1;
}

.app-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.tag {
  background: var(--background-color);
  color: var(--text-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
}

.tag-more {
  background: var(--text-secondary);
  color: white;
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
}

.app-card-footer {
  margin-top: auto;
}

.app-stats {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-rating {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stars {
  display: flex;
  gap: 0.125rem;
}

.stars i {
  color: #d1d5db;
  font-size: 0.875rem;
}

.stars i.active {
  color: #fbbf24;
}

.rating-text {
  font-size: 0.875rem;
  font-weight: 500;
}

.app-actions {
  display: flex;
  gap: 0.5rem;
}

/* 按钮样式 */
.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: center;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: #5a67d8;
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

.btn-outline:hover {
  background: var(--primary-color);
  color: white;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.btn-large {
  padding: 0.75rem 1.5rem;
  font-size: 1.1rem;
}

.btn-block {
  width: 100%;
}

/* 加载更多 */
.load-more-section {
  text-align: center;
  margin: 3rem 0;
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
}

.empty-icon {
  font-size: 4rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.empty-state h3 {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.empty-state p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* 订阅区域 */
.newsletter-section {
  background: var(--surface-color);
  padding: 4rem 0;
}

.newsletter-card {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 3rem;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.newsletter-content {
  flex: 1;
  min-width: 300px;
}

.newsletter-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.newsletter-description {
  opacity: 0.9;
}

.newsletter-form {
  display: flex;
  gap: 1rem;
  min-width: 300px;
}

.newsletter-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: 0.5rem;
  outline: none;
}

/* 页脚 */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  margin-bottom: 1rem;
  font-weight: 600;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: #d1d5db;
  text-decoration: none;
  transition: color 0.3s;
}

.footer-section a:hover {
  color: white;
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: background-color 0.3s;
}

.social-links a:hover {
  background: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #374151;
  color: #9ca3af;
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--primary-color);
  color: white;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  z-index: 100;
}

.back-to-top:hover {
  background: var(--secondary-color);
  transform: translateY(-2px);
}

/* 加载覆盖层 */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-spinner {
  background: white;
  padding: 2rem;
  border-radius: 1rem;
  text-align: center;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar-menu {
    flex-direction: column;
    width: 100%;
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 1rem;
  }
  
  .categories-grid {
    grid-template-columns: 1fr;
  }
  
  .filter-bar {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .results-count {
    margin-left: 0;
  }
  
  .apps-grid {
    grid-template-columns: 1fr;
  }
  
  .newsletter-card {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}