/* aicatalogx.com - 明亮现代风 */
:root {
  --primary-bg: #ffffff;
  --secondary-bg: #fff7ed;
  --accent-orange: #f97316;
  --accent-orange-light: #fb923c;
  --accent-orange-dark: #ea580c;
  --text-primary: #1c1917;
  --text-secondary: #78716c;
  --border-color: #e7e5e4;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

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

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

/* 导航栏 */
header {
  background: var(--primary-bg);
  border-bottom: 1px solid var(--border-color);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent-orange);
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-orange);
}

/* Hero区域 */
.hero {
  padding: 140px 2rem 60px;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
}

.hero h1 span {
  color: var(--accent-orange);
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* 搜索框 */
.search-container {
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

.search-box {
  width: 100%;
  padding: 16px 20px;
  padding-left: 50px;
  font-size: 1.1rem;
  border: 2px solid var(--border-color);
  border-radius: 50px;
  background: var(--primary-bg);
  transition: all 0.3s;
}

.search-box:focus {
  outline: none;
  border-color: var(--accent-orange);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.1);
}

.search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
}

/* 主要内容 */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

section {
  padding: 40px 0;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: 1.8rem;
  color: var(--text-primary);
}

.section-title span {
  color: var(--accent-orange);
}

/* 分类标签 */
.category-tabs {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.category-tab {
  padding: 8px 16px;
  background: var(--primary-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
}

.category-tab:hover,
.category-tab.active {
  background: var(--accent-orange);
  color: white;
  border-color: var(--accent-orange);
}

/* 工具卡片网格 */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  background: var(--primary-bg);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  transition: all 0.3s;
  cursor: pointer;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-orange);
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.tool-logo {
  width: 48px;
  height: 48px;
  background: var(--secondary-bg);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.tool-info h3 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.tool-info .category {
  font-size: 0.8rem;
  color: var(--accent-orange);
  background: rgba(249, 115, 22, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
}

.tool-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.tool-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  padding: 4px 10px;
  background: var(--secondary-bg);
  color: var(--text-secondary);
  border-radius: 4px;
}

.tool-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.tool-link {
  flex: 1;
  padding: 8px 16px;
  text-align: center;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s;
}

.tool-link.primary {
  background: var(--accent-orange);
  color: white;
}

.tool-link.primary:hover {
  background: var(--accent-orange-dark);
}

.tool-link.secondary {
  background: var(--secondary-bg);
  color: var(--text-primary);
}

.tool-link.secondary:hover {
  background: var(--border-color);
}

/* 分类列表页 */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

.category-card {
  background: var(--primary-bg);
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: all 0.3s;
  text-decoration: none;
  color: inherit;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-orange);
}

.category-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.category-card h3 {
  margin-bottom: 0.5rem;
}

.category-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* 提交页面 */
.submit-container {
  max-width: 600px;
  margin: 0 auto;
  background: var(--primary-bg);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.3s;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-orange);
}

.form-control::placeholder {
  color: var(--text-secondary);
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background: var(--accent-orange-dark);
  transform: translateY(-2px);
}

/* 统计 */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.stat-item {
  background: var(--primary-bg);
  padding: 1.5rem;
  border-radius: 12px;
  text-align: center;
  border: 1px solid var(--border-color);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--accent-orange);
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* 友情链接 */
.friend-links {
  background: var(--primary-bg);
  padding: 2rem;
  border-radius: 12px;
  margin-top: 3rem;
  text-align: center;
  border: 1px solid var(--border-color);
}

.friend-links h3 {
  margin-bottom: 1rem;
}

.friend-links-grid {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.friend-links a {
  color: var(--accent-orange);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border: 1px solid var(--accent-orange);
  border-radius: 6px;
  transition: all 0.3s;
}

.friend-links a:hover {
  background: var(--accent-orange);
  color: white;
}

/* Footer */
footer {
  background: var(--text-primary);
  color: white;
  padding: 2rem;
  text-align: center;
  margin-top: 3rem;
}

footer p {
  margin-bottom: 0.5rem;
  color: #a8a29e;
}

footer a {
  color: var(--accent-orange-light);
  text-decoration: none;
}

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .stats {
    grid-template-columns: 1fr;
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
  }
  
  .category-tabs {
    justify-content: center;
  }
}