:root {
  --primary-color: #2F6BFF;
  --accent-color: #6FA3FF;
  --button-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
  --card-bg: #FFFFFF;
  --background-color: #F4F7FB;
  --text-main: #1F2D3D;
  --text-dark: #000000;
  --border-color: #D6E2FF;
  --glow-color: #A5C4FF;
  --header-offset: 122px; /* Desktop: 68px (header-top) + 52px (main-nav) = 120px + 2px buffer */
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: var(--text-main);
  background-color: var(--background-color);
  padding-top: var(--header-offset);
  overflow-x: hidden; /* Prevent body overflow on desktop as well */
}

a {
  text-decoration: none;
  color: var(--primary-color);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--primary-color); /* Using primary color for header-top */
  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: 0 20px; /* Padding for logo and buttons */
}

.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--card-bg); /* White for contrast */
  text-transform: uppercase;
  display: block;
}

.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;
}

.btn {
  padding: 10px 20px;
  border-radius: 25px;
  background: var(--button-gradient);
  color: var(--card-bg); /* White text for contrast */
  font-weight: bold;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.3s ease, transform 0.2s ease;
  border: none;
  cursor: pointer;
  font-size: 15px;
  line-height: 1; /* Ensure text fits */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(47, 107, 255, 0.3);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(47, 107, 255, 0.4);
}

/* Mobile buttons - hidden by default on desktop */
.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden on desktop */
  min-height: 48px;
  background-color: var(--background-color); /* Light background for mobile buttons */
  width: 100%;
  padding: 0 15px; /* Adjust padding for mobile */
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: nowrap;
  overflow: hidden;
}

.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--accent-color); /* Using accent color for main-nav, distinct from header-top */
  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;
  gap: 25px; /* Spacing between nav links */
}

.nav-link {
  color: var(--card-bg); /* White text for contrast */
  font-weight: bold;
  font-size: 16px;
  padding: 5px 0;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: rgba(255, 255, 255, 0.8);
}

.hamburger-menu {
  display: none; /* Hidden on desktop */
  cursor: pointer;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: 1001; /* Above header */
}

.hamburger-menu .bar {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--card-bg); /* White bars */
  margin: 5px 0;
  transition: all 0.3s ease;
}

/* Mobile Navigation Overlay */
.overlay {
  display: none; /* Hidden by default */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 998; /* Below menu, above content */
  transition: opacity 0.3s ease;
  opacity: 0;
}

.overlay.active {
  display: block;
  opacity: 1;
}

/* Footer Styles */
.site-footer {
  background-color: var(--text-dark); /* Dark background for footer */
  color: rgba(255, 255, 255, 0.7);
  padding: 40px 20px 20px;
  font-size: 14px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto 30px;
}

.footer-col h3 {
  color: var(--card-bg); /* White heading */
  font-size: 18px;
  margin-bottom: 15px;
}

.footer-col .footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--card-bg); /* White logo */
  text-transform: uppercase;
  margin-bottom: 15px;
  display: block;
}

.footer-col .footer-description {
  line-height: 1.6;
  margin-bottom: 15px;
  color: rgba(255, 255, 255, 0.7);
  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 a {
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s ease;
}

.footer-nav a:hover {
  color: var(--accent-color);
}

.footer-bottom {
  text-align: center;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
  margin: 0;
}

/* Dynamic slot anchors - ensure they don't hide content */
.footer-slot-anchor, .footer-slot-anchor-inner {
  min-height: 1px; /* Ensure they take up minimal space */
  display: block; /* Ensure they are part of the flow */
}

/* Mobile Styles */
@media (max-width: 768px) {
  :root {
    --header-offset: 110px; /* Mobile: 60px (header-top) + 48px (mobile-nav-buttons) = 108px + 2px buffer */
  }

  .site-header {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); /* Slightly stronger shadow for mobile */
  }

  .header-top {
    min-height: 60px;
    height: 60px;
    background-color: var(--primary-color); /* Keep consistent color */
  }

  .header-container {
    padding: 0 15px; /* Reduced padding for mobile */
    justify-content: space-between;
    position: relative; /* For logo absolute positioning */
  }

  .hamburger-menu {
    display: block; /* Show hamburger menu on mobile */
    order: -1; /* Place it to the left */
  }

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

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

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

  /* Mobile Logo Centering (Method 1: Flexbox) */
  .header-container .logo {
    flex: 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    max-width: calc(100% - 100px); /* Account for hamburger and potential right-side items */
  }

  .logo img {
    max-height: 56px !important; /* Adjusted for mobile header height */
    max-width: 100%;
    height: auto;
  }

  .desktop-nav-buttons {
    display: none !important; /* Hide desktop buttons on mobile */
  }

  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons */
    min-height: 48px;
    background-color: var(--background-color);
    padding: 8px 15px; /* Adjusted padding */
    gap: 10px;
    flex-wrap: nowrap;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    overflow: hidden; /* Prevent overflow */
    justify-content: center; /* Center the buttons if only one or less than full width */
  }

  .mobile-nav-buttons .btn {
    flex: 1;
    min-width: 0;
    max-width: calc(50% - 5px); /* Two buttons with 10px gap */
    padding: 8px 12px; /* Smaller padding for mobile buttons */
    font-size: 13px; /* Smaller font for mobile buttons */
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
    box-shadow: 0 2px 5px rgba(47, 107, 255, 0.2);
  }

  .main-nav {
    min-height: auto; /* Auto height for expanded menu */
    height: auto;
    background-color: var(--accent-color);
    position: fixed;
    top: var(--header-offset); /* Position below fixed header and mobile buttons */
    left: 0;
    width: 280px; /* Width of the mobile menu */
    max-width: 80%;
    transform: translateX(-100%); /* Hidden by default */
    transition: transform 0.3s ease;
    flex-direction: column;
    padding: 20px 0;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
    display: none; /* Ensure it's hidden when not active */
    overflow-y: auto; /* Enable scrolling for long menus */
    -webkit-overflow-scrolling: touch;
    bottom: 0; /* Extend to bottom */
  }

  .main-nav.active {
    transform: translateX(0); /* Show menu */
    display: flex; /* Display as flex column */
  }

  .nav-container {
    flex-direction: column;
    align-items: flex-start; /* Align menu items to the left */
    padding: 0 20px;
    gap: 15px; /* Spacing between mobile nav links */
    width: 100%;
    max-width: none;
    height: auto;
  }

  .nav-link {
    width: 100%;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  .nav-link:last-child {
    border-bottom: none;
  }

  /* Footer Mobile */
  .site-footer {
    padding: 30px 15px;
  }

  .footer-top-grid {
    grid-template-columns: 1fr; /* Single column layout */
    margin-bottom: 20px;
  }

  .footer-col {
    margin-bottom: 20px;
  }
  .footer-col:last-child {
    margin-bottom: 0;
  }

  .footer-bottom {
    margin-top: 20px;
    padding-top: 15px;
  }

  /* Mobile content overflow 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;
  }

  body.no-scroll {
    overflow: 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;
  }
}