:root {
  /* 从logo提取的主色调 */
  --primary-dark: #0055a4;  /* 深蓝色 */
  --primary-light: #00a0e9; /* 浅蓝色 */
  --white: #ffffff;
  --black: #111111;
  --gray-light: #f5f5f5;
  --gray: #e0e0e0;
  --gray-dark: #666666;
  
  /* 尺寸变量 */
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
}

/* 基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: var(--black);
  background-color: var(--white);
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: var(--primary-dark);
  text-decoration: none;
  transition: color 0.3s;
}

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

ul {
  list-style: none;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  transition: all 0.3s ease;
}

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

.btn.primary:hover {
  background-color: #004a8f;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn.secondary {
  background-color: var(--white);
  color: var(--primary-dark);
  border: 2px solid var(--primary-dark);
}

.btn.secondary:hover {
  background-color: var(--gray-light);
  transform: translateY(-2px);
}

/* 头部导航 */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
}

.logo-container {
  display: flex;
  align-items: center;
}

.logo {
  height: 50px;
  width: auto;
}

.company-name {
  margin-left: 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--primary-dark);
}

nav ul {
  display: flex;
  gap: 20px;
}

nav a {
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

nav a:hover {
  background-color: rgba(0, 85, 164, 0.1);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu-btn span {
  display: block;
  width: 25px;
  height: 3px;
  margin: 5px 0;
  background-color: var(--primary-dark);
  transition: all 0.3s ease;
}

/* 英雄区域 */
.hero {
  position: relative;
  padding: 80px 0;
  text-align: center;
  background-color: var(--primary-dark);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('background.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.7;
  z-index: 1;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 85, 164, 0.8) 0%, rgba(0, 160, 233, 0.6) 100%);
  z-index: 2;
}

.hero .container {
  position: relative;
  z-index: 3;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--white);
}

.tagline {
  font-size: 1.5rem;
  margin-bottom: 30px;
  color: var(--white);
}

.cta-buttons {
  display: flex;
  gap: 15px;
  justify-content: center;
}

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

.cta-buttons .btn.primary:hover {
  background-color: var(--gray-light);
}

.cta-buttons .btn.secondary {
  background-color: transparent;
  color: var(--white);
  border: 2px solid var(--white);
}

.cta-buttons .btn.secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* 内容区域 */
.section {
  padding: 60px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 40px;
  color: var(--primary-dark);
  font-size: 2rem;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background-color: var(--primary-light);
  margin: 15px auto 0;
  border-radius: 2px;
}

/* 卡片样式 */
.info-cards, .values-container, .services-container, .partners-container {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}

.info-cards {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.values-container {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.services-container {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.card, .value-card, .service-card, .contact-card {
  background-color: var(--white);
  border-radius: var(--radius-lg);
  padding: 25px;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover, .value-card:hover, .service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.card h3, .value-card h3, .service-card h3 {
  color: var(--primary-dark);
  margin-bottom: 15px;
}

/* 服务图标 */
.service-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  margin-bottom: 20px;
  background-color: rgba(0, 160, 233, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 24px;
  color: var(--primary-dark);
}

.service-icon.outbound, .service-icon.inbound, .service-icon.education, .service-icon.investment {
  background-color: rgba(0, 160, 233, 0.1);
  color: var(--primary-dark);
}

.service-card ul {
  margin-top: 15px;
  padding-left: 20px;
}

.service-card li {
  position: relative;
  padding-left: 15px;
  margin-bottom: 8px;
}

.service-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--primary-light);
}

/* 合作伙伴 */
.partners-container {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.partner {
  background-color: var(--white);
  padding: 20px 30px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-weight: 500;
  color: var(--primary-dark);
  border: 1px solid var(--gray);
}

/* 联系我们 */
.contact-card {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

/* 页脚 */
footer {
  background-color: var(--primary-dark);
  color: var(--white);
  padding: 40px 0;
  margin-top: 60px;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-logo img {
  filter: brightness(0) invert(1);
}

.copyright {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
  nav {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .tagline {
    font-size: 1.2rem;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .section {
    padding: 40px 0;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 60px 0;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .btn {
    width: 100%;
  }
  
  .card, .value-card, .service-card {
    padding: 20px;
  }
}