:root { --header-offset: 122px; }
body { padding-top: var(--header-offset); overflow-x: hidden; }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  background-color: #F4F7FB; /* Base background for the whole header wrapper */
}

.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: #2F6BFF; /* Primary color for top bar */
  color: #fff;
  width: 100%;
}

.header-container {
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 20px;
  padding-right: 20px;
}

.hamburger-menu {
  display: none; /* Hidden on desktop */
}

.logo {
  font-size: 24px;
  font-weight: bold;
  text-decoration: none;
  color: #fff;
  display: block;
  white-space: nowrap;
}

.logo img {
  display: block;
  max-height: 60px;
  height: auto;
  width: auto;
  max-width: 280px;
  object-fit: contain;
}

.desktop-nav-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
}

.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden on desktop */
  min-height: 48px;
}

.btn {
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 5px;
  font-weight: bold;
  color: #fff;
  background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
  transition: background 0.3s ease;
  white-space: nowrap;
  border: none;
  cursor: pointer;
  text-align: center;
}

.btn:hover {
  opacity: 0.9;
}

.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: #6FA3FF; /* Auxiliary color for main nav */
  width: 100%;
}

.nav-container {
  box-sizing: border-box;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  padding: 0 20px;
}

.nav-link {
  color: #fff;
  text-decoration: none;
  padding: 10px 15px;
  font-weight: 500;
  transition: background-color 0.3s ease;
  white-space: nowrap;
}

.nav-link:hover {
  background-color: rgba(255,255,255,0.1);
  border-radius: 3px;
}

.mobile-overlay {
  display: none;
}

/* Footer Styles */
.site-footer {
  background-color: #1F2D3D; /* Text Main for footer background */
  color: #D6E2FF; /* Border color for footer text */
  padding: 40px 0 20px;
}

.footer-top-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 0 20px;
}

.footer-col h3 {
  color: #fff;
  margin-bottom: 15px;
  font-size: 18px;
  font-weight: bold;
}

.footer-logo {
  font-size: 22px;
  font-weight: bold;
  text-decoration: none;
  color: #fff;
  display: block;
  margin-bottom: 15px;
}

.footer-description {
  font-size: 14px;
  line-height: 1.6;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.footer-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.footer-nav li:last-child {
  margin-bottom: 0;
}

.footer-nav li a {
  color: #D6E2FF;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 30px auto 0;
  padding: 20px;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 13px;
  color: #D6E2FF;
}

/* Mobile Styles */
@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  body { padding-top: var(--header-offset); overflow-x: hidden; }

  .site-header {
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  }

  .header-top {
    min-height: 60px !important;
    height: 60px !important;
    padding: 0 15px;
    justify-content: flex-start; /* Align hamburger to start */
  }

  .header-container {
    width: 100%;
    max-width: none;
    padding: 0; /* Hamburger and logo have their own spacing */
    position: relative;
    justify-content: flex-start;
  }

  .hamburger-menu {
    display: block;
    background: none;
    border: none;
    font-size: 28px;
    color: #fff;
    cursor: pointer;
    z-index: 1001;
    padding: 0 10px 0 0;
  }

  .logo {
    flex: 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    margin-right: 40px; /* Space for potential right-aligned elements if any, or to balance centered logo */
  }

  .logo img {
    max-height: 56px !important;
  }

  .desktop-nav-buttons {
    display: none !important;
  }

  .mobile-nav-buttons {
    display: flex !important;
    min-height: 48px;
    align-items: center;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: #F4F7FB; /* Lighter background for button bar */
    justify-content: center;
  }

  .mobile-nav-buttons .btn {
    flex: 1;
    min-width: 0;
    max-width: calc(50% - 5px); /* Account for 10px gap */
    box-sizing: border-box;
    padding: 8px 12px;
    font-size: 13px;
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  .main-nav {
    display: none; /* Hidden by default */
    flex-direction: column;
    position: fixed;
    top: var(--header-offset); /* Position below fixed header and mobile buttons */
    left: 0;
    width: 80%;
    max-width: 300px;
    height: calc(100% - var(--header-offset));
    background-color: #2F6BFF; /* Primary color for mobile menu */
    transform: translateX(-100%); /* Slide out from left */
    transition: transform 0.3s ease;
    z-index: 1001;
    overflow-y: auto;
  }

  .main-nav.active {
    display: flex; /* Show when active */
    transform: translateX(0);
  }

  .nav-container {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 15px;
    width: 100%;
    max-width: none;
  }

  .nav-link {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  .nav-link:last-child {
    border-bottom: none;
  }

  .mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 999;
  }

  .mobile-overlay.active {
    display: block;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    padding: 0 15px;
  }

  .footer-col {
    margin-bottom: 30px;
  }

  .footer-col:last-child {
    margin-bottom: 0;
  }

  .footer-bottom {
    padding: 15px;
  }

  /* Mobile content area protection */
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}
/* 移动端内容区防溢出（系统追加，请勿删除） */
@media (max-width: 768px) {
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }
  body {
    overflow-x: hidden;
  }
}