/*
Theme Name: SEO Sir Theme
Description: 专业的外贸推广网站主题，专为谷歌SEO和外贸推广服务设计
Author: SEO Sir Team
Version: 1.0.0
License: GPL v2 or later
Text Domain: seosir-theme
*/

/* ==========================================================================
   CSS变量定义 - 设计系统
   ========================================================================== */

:root {
  /* 主色调 - 基于参考图片 */
  --primary-color: #FF6B6B;
  --primary-hover: #FF5252;
  --primary-light: #FFE0E0;
  
  /* 辅助色 */
  --secondary-color: #4ECDC4;
  --accent-color: #45B7D1;
  --success-color: #4CAF50;
  --warning-color: #FF9800;
  --error-color: #F44336;
  
  /* 中性色 */
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-light: #999999;
  --background-primary: #FFFFFF;
  --background-secondary: #F8F9FA;
  --background-light: #FAFBFC;
  --border-color: #E0E0E0;
  --border-light: #F0F0F0;
  
  /* 字体 */
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --font-secondary: "Roboto", "Open Sans", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  
  /* 字体大小 */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  /* 间距 */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */
  
  /* 圆角 */
  --border-radius-sm: 0.25rem;  /* 4px */
  --border-radius-md: 0.5rem;   /* 8px */
  --border-radius-lg: 0.75rem;  /* 12px */
  --border-radius-xl: 1rem;     /* 16px */
  --border-radius-full: 9999px;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* 过渡动画 */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* 容器宽度 */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* ==========================================================================
   基础重置和全局样式
   ========================================================================== */

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

html {
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 链接样式 */
a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

/* 段落样式 */
p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

/* 列表样式 */
ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

li {
  margin-bottom: var(--spacing-xs);
}

/* 图片样式 */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   布局组件
   ========================================================================== */

/* 容器 */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 640px) {
  .container { padding: 0 var(--spacing-lg); }
}

@media (min-width: 1024px) {
  .container { padding: 0 var(--spacing-xl); }
}

/* Flexbox工具类 */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }

/* Grid工具类 */
.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.gap-4 { gap: var(--spacing-md); }
.gap-6 { gap: var(--spacing-lg); }
.gap-8 { gap: var(--spacing-xl); }

/* 响应式网格 */
@media (min-width: 640px) {
  .sm\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ==========================================================================
   按钮组件
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* 主要按钮 */
.btn-primary {
  color: white;
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-primary:hover {
  color: white;
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* 次要按钮 */
.btn-secondary {
  color: var(--primary-color);
  background-color: transparent;
  border-color: var(--primary-color);
}

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

/* 大按钮 */
.btn-lg {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-lg);
  border-radius: var(--border-radius-lg);
}

/* 小按钮 */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   卡片组件
   ========================================================================== */

.card {
  background-color: var(--background-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-light);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-light);
  background-color: var(--background-secondary);
}

/* ==========================================================================
   工具类
   ========================================================================== */

/* 文本对齐 */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* 文本颜色 */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-light { color: var(--text-light); }
.text-white { color: white; }

/* 背景颜色 */
.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--background-secondary); }
.bg-light { background-color: var(--background-light); }
.bg-white { background-color: white; }

/* 间距 */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--spacing-md); }
.mt-8 { margin-top: var(--spacing-xl); }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--spacing-md); }
.mb-8 { margin-bottom: var(--spacing-xl); }
.py-8 { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }
.py-12 { padding-top: var(--spacing-3xl); padding-bottom: var(--spacing-3xl); }
.py-16 { padding-top: var(--spacing-4xl); padding-bottom: var(--spacing-4xl); }

/* 显示/隐藏 */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* 响应式显示 */
@media (max-width: 767px) {
  .md\:hidden { display: none; }
}

@media (min-width: 768px) {
  .md\:block { display: block; }
  .md\:flex { display: flex; }
}

/* ==========================================================================
   响应式设计
   ========================================================================== */

/* 移动端优先的响应式断点 */
@media (max-width: 639px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }
}

@media (min-width: 640px) {
  /* 小屏幕样式 */
}

@media (min-width: 768px) {
  /* 中等屏幕样式 */
}

@media (min-width: 1024px) {
  /* 大屏幕样式 */
}

@media (min-width: 1280px) {
  /* 超大屏幕样式 */
}

/* ==========================================================================
   底部样式 - 简洁版设计
   ========================================================================== */

.site-footer {
  background-color: #2d3748;
  background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
  border-top: none;
}

/* 主要内容区域 */
.footer-main {
  padding: var(--spacing-4xl) 0 var(--spacing-3xl) 0;
}

/* Logo区域 */
.footer-logo-section {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.footer-logo {
  display: inline-block;
}

.logo-circle {
  margin: 0 auto;
  width: 80px;
  height: 80px;
}

.logo-circle svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 4px 8px rgba(220, 38, 38, 0.2));
}

/* 导航菜单区域 */
.footer-navigation {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
}

.footer-nav a {
  color: #e2e8f0;
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.footer-nav a:hover {
  color: #ffffff;
}

.footer-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: #ffffff;
  transition: width var(--transition-fast);
}

.footer-nav a:hover::after {
  width: 100%;
}

/* 品牌标语区域 */
.footer-slogan {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  padding: 0 var(--spacing-lg);
}

.slogan-cn {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: #ffffff;
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.5px;
}

.slogan-en {
  font-size: var(--font-size-lg);
  color: #cbd5e0;
  font-weight: 400;
  margin-bottom: 0;
  font-style: italic;
}

/* 搜索引擎Logo展示区域 */
.search-engines-section {
  margin-bottom: var(--spacing-1xl);
}

.search-engines-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.engine-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--background-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  height: 80px;
}

.engine-logo:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.engine-logo .engine-name {
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-align: center;
}

/* 各搜索引擎品牌色彩 */
.engine-yahoo .engine-name {
  color: #410093;
}

.engine-linkedin .engine-name {
  color: #0077B5;
}

.engine-youtube .engine-name {
  color: #FF0000;
}

.engine-google .engine-name {
  background: linear-gradient(45deg, #4285f4, #34a853, #fbbc05, #ea4335);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.engine-facebook .engine-name {
  color: #1877F2;
}

.engine-twitter .engine-name {
  color: #1DA1F2;
}

.engine-bing .engine-name {
  color: #008373;
}

.engine-yandex .engine-name {
  color: #FC3F1D;
}

/* 底部链接和备案信息 */
.footer-bottom {
  background-color: rgba(0, 0, 0, 0.2);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--spacing-lg) 0;
}

.footer-bottom-content {
  text-align: center;
}

.footer-links {
  font-size: var(--font-size-sm);
  color: #a0aec0;
  line-height: 1.8;
}

.footer-links a {
  color: #a0aec0;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-links .separator {
  margin: 0 var(--spacing-sm);
  color: #718096;
}

.icp-info, .police-info {
  color: #a0aec0;
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius-full);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  z-index: 1000;
}

.back-to-top:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.back-to-top.show {
  display: flex;
}

/* 响应式设计 */
@media (max-width: 767px) {
  .footer-main {
    padding: var(--spacing-2xl) 0 var(--spacing-xl) 0;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .slogan-cn {
    font-size: var(--font-size-xl);
  }
  
  .slogan-en {
    font-size: var(--font-size-base);
  }
  
  .search-engines-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    max-width: 400px;
  }
  
  .engine-logo {
    height: 60px;
    padding: var(--spacing-sm);
  }
  
  .engine-logo img {
    max-height: 30px;
  }
  
  .footer-links {
    line-height: 2;
  }
  
  .footer-links .separator {
    display: block;
    margin: var(--spacing-xs) 0;
  }
  
  .back-to-top {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .search-engines-grid {
    grid-template-columns: repeat(4, 1fr);
    max-width: 600px;
  }
}

@media (min-width: 1024px) {
  .footer-nav {
    gap: var(--spacing-2xl);
  }
  
  .search-engines-grid {
    grid-template-columns: repeat(7, 1fr);
    max-width: 1000px;
  }
}

/* ==========================================
   面包屑导航统一样式
   ========================================== */

/* 面包屑区域 */
.breadcrumb-section {
  background: linear-gradient(135deg, #f8f9ff 0%, #f0f4ff 100%);
  border-bottom: 1px solid rgba(103, 126, 234, 0.1);
  margin-bottom: 0;
  position: relative;
  overflow: hidden;
}

.breadcrumb-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(103,126,234,0.03)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.5;
}

/* 面包屑导航容器 */
.breadcrumb {
  position: relative;
  z-index: 1;
}

.page-title h1 {
  color: #fff;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.2rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* 面包屑项目 */
.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-item:first-child .breadcrumb-separator {
  display: none;
}

/* 面包屑链接 */
.breadcrumb-link {
  color: #667eea;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  position: relative;
}

.breadcrumb-link:hover {
  color: #764ba2;
  background: rgba(118, 75, 162, 0.1);
  transform: translateY(-1px);
}

.breadcrumb-link:active {
  transform: translateY(0);
}

/* 当前页面 */
.breadcrumb-current {
  color: #4a5568;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  background: rgba(103, 126, 234, 0.1);
  border-radius: 6px;
  border: 1px solid rgba(103, 126, 234, 0.2);
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 分隔符 */
.breadcrumb-separator {
  color: #cbd5e0;
  font-weight: 400;
  font-size: 0.85rem;
  margin: 0 0.25rem;
  user-select: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .breadcrumb-section {
    padding: 1rem 0;
  }
  
  .breadcrumb-list {
    font-size: 0.85rem;
    gap: 0.1rem;
  }
  
  .breadcrumb-item {
    gap: 0.3rem;
  }
  
  .breadcrumb-link,
  .breadcrumb-current {
    padding: 0.2rem 0.4rem;
    font-size: 0.85rem;
  }
  
  .breadcrumb-current {
    max-width: 200px;
  }
  
  .breadcrumb-separator {
    margin: 0 0.15rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .breadcrumb-section {
    padding: 0.8rem 0;
  }
  
  .breadcrumb-list {
    font-size: 0.8rem;
  }
  
  .breadcrumb-current {
    max-width: 150px;
  }
}

/* ==========================================
   CTA区域统一样式
   ========================================== */

/* CTA区域通用样式 */
.cta-section,
.about-cta,
.services-cta,
.final-cta-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 5rem 0;
  position: relative;
  overflow: hidden;
  text-align: center;
}

.cta-section::before,
.about-cta::before,
.services-cta::before,
.final-cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1.5" fill="rgba(255,255,255,0.08)"/><circle cx="40" cy="70" r="1" fill="rgba(255,255,255,0.06)"/><circle cx="70" cy="15" r="1.2" fill="rgba(255,255,255,0.07)"/></svg>');
  opacity: 0.6;
  animation: backgroundFloat 20s ease-in-out infinite;
}

@keyframes backgroundFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(1deg); }
}

/* CTA内容 */
.cta-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
}

.cta-content h2,
.cta-title {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: white;
  text-shadow: 0 2px 15px rgba(0,0,0,0.3);
  line-height: 1.2;
}

.cta-content p,
.cta-subtitle {
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  margin-bottom: 2.5rem;
  color: rgba(255, 255, 255, 0.98);
  font-weight: 400;
  text-shadow: 0 1px 5px rgba(0,0,0,0.3);
  line-height: 1.6;
}

/* CTA图标 */
.cta-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  margin: 0 auto 2rem;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.cta-icon svg {
  width: 40px;
  height: 40px;
  color: white;
}

/* CTA按钮组 */
.cta-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

/* ==========================================
   按钮统一样式
   ========================================== */

/* 基础按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  white-space: nowrap;
  min-width: 160px;
  line-height: 1.5;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

/* 按钮光效动画 */
.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

/* 主要按钮 */
.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
  border-color: transparent;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.4);
  color: white;
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

/* 次要按钮 */
.btn-secondary {
  background: transparent;
  color: white;
  border-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255,255,255,0.2);
  color: white;
}

.btn-secondary:active {
  transform: translateY(0);
  background: rgba(255, 255, 255, 0.1);
}

/* 大尺寸按钮 */
.btn-large {
  padding: 1.3rem 3rem;
  font-size: 1.1rem;
  min-width: 200px;
}

/* 浅色背景上的按钮 */
.btn-light {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-color: transparent;
}

.btn-light:hover {
  background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
  color: white;
}

/* outline按钮（浅色背景） */
.btn-outline {
  background: transparent;
  color: #667eea;
  border-color: #667eea;
}

.btn-outline:hover {
  background: #667eea;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

/* CTA特色功能列表 */
.cta-features {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}

.cta-features .feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  font-size: 0.95rem;
}

.cta-features .feature-icon {
  font-size: 1.2rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .cta-section,
  .about-cta,
  .services-cta,
  .final-cta-section {
    padding: 3rem 0;
  }
  
  .cta-buttons {
    gap: 1rem;
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    min-width: 250px;
    padding: 1.1rem 2rem;
  }
  
  .cta-features {
    gap: 1rem;
    margin-top: 2rem;
    flex-direction: column;
    align-items: center;
  }
  
  .cta-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 1.5rem;
  }
  
  .cta-icon svg {
    width: 30px;
    height: 30px;
  }
}

@media (max-width: 480px) {
  .cta-section,
  .about-cta,
  .services-cta,
  .final-cta-section {
    padding: 2.5rem 0;
  }
  
  .btn {
    min-width: 200px;
    padding: 1rem 1.5rem;
    font-size: 0.95rem;
  }
}