/* 通用基础样式 */
body {
  margin: 0;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #F8F9FA;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* 页头 (Header) 样式 */
.site-header {
  background-color: #0A1931;
  color: #FFFFFF;
  padding: 15px 20px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-header .logo {
  font-size: 28px;
  font-weight: bold;
  color: #FFD700; /* 辅助色作为Logo主色 */
  text-transform: uppercase;
  letter-spacing: 1px;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
  transition: color 0.3s ease;
}

.site-header .logo:hover {
  color: #FFF;
}

.main-nav ul {
  display: flex;
  gap: 25px;
}

.main-nav a {
  color: #FFFFFF;
  font-size: 16px;
  font-weight: 500;
  padding: 8px 0;
  position: relative;
  transition: color 0.3s ease;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background-color: #FFD700; /* 辅助色作为下划线 */
  transition: width 0.3s ease;
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

.main-nav a:hover,
.main-nav a.active {
  color: #FFD700;
}

.hamburger-menu {
  display: none; /* 默认隐藏，在移动端显示 */
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: 1001; /* 确保在导航菜单之上 */
}

.hamburger-menu span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: #FFFFFF;
  margin-bottom: 5px;
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger-menu span:last-child {
  margin-bottom: 0;
}

.hamburger-menu.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 页脚 (Footer) 样式 */
.site-footer {
  background-color: #0A1931;
  color: #CAD2D3;
  padding: 40px 20px 20px;
  font-size: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 30px;
  padding-bottom: 30px;
}

.footer-column {
  flex: 1;
  min-width: 250px;
}

.footer-column h3 {
  color: #FFD700; /* 辅助色作为标题 */
  font-size: 18px;
  margin-bottom: 15px;
  font-weight: bold;
}

.footer-column p {
  margin-bottom: 10px;
  line-height: 1.8;
}

.footer-column a {
  color: #CAD2D3;
  transition: color 0.3s ease;
}

.footer-column a:hover {
  color: #FFD700;
}

.footer-nav ul li {
  margin-bottom: 8px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  text-align: center;
  color: #888;
}

.copyright {
  margin: 0;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .main-nav ul {
    gap: 15px;
  }
}

@media (max-width: 768px) {
  .header-container {
    flex-wrap: wrap;
  }

  .main-nav {
    flex-basis: 100%;
    order: 3; /* 确保导航在汉堡菜单下方 */
    display: none; /* 默认隐藏 */
    padding-top: 15px;
    text-align: center;
    background-color: #0A1931; /* 确保菜单展开时背景色一致 */
  }

  .main-nav.active {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .main-nav li {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .main-nav li:last-child {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .main-nav a {
    display: block;
    padding: 15px 20px;
  }

  .main-nav a::after {
    display: none;
  }

  .hamburger-menu {
    display: block;
    margin-left: auto; /* 将汉堡菜单推到右侧 */
  }

  .footer-container {
    flex-direction: column;
    gap: 20px;
  }

  .footer-column {
    min-width: unset;
  }

  .footer-column:not(:last-child) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 20px;
  }
}