:root {
  --primary-color: #113B7A;
  --secondary-color: #1D5FD1;
  --text-main: #F3F8FF;
  --text-secondary: #AFC4E8;
  --card-bg: #10233F;
  --border-color: #244D84;
  --glow-color: #4FA8FF;
  --gold-color: #F2C14E;
  --divider-color: #1B3357;
  --deep-navy-color: #08162B;
  --button-gradient: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%);
  --header-offset: 122px; /* Desktop: 68px (header-top) + 52px (main-nav) + 2px */
}

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

body.no-scroll {
  overflow: hidden;
}

/* Site Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  background-color: var(--deep-navy-color); /* Ensure solid background */
}

.header-top {
  box-sizing: border-box;
  height: 68px; /* Desktop fixed height */
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--primary-color); /* Different from main-nav */
  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;
}

.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--gold-color);
  text-decoration: none;
  display: block; /* Ensure visibility */
  flex-shrink: 0;
}

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

.desktop-nav-buttons {
  display: flex; /* Visible on desktop */
  gap: 12px;
  align-items: center;
  flex-shrink: 0;
}

/* Mobile buttons, hidden on desktop */
.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden globally */
  min-height: 48px; /* Mobile fixed height */
  background-color: var(--secondary-color); /* A different color for this strip */
  width: 100%;
  align-items: center; /* Vertical center buttons */
  justify-content: center; /* Horizontal center buttons */
  padding: 0 15px; /* Add some padding */
  overflow: hidden;
}

.main-nav {
  box-sizing: border-box;
  height: 52px; /* Desktop fixed height */
  display: flex; /* Visible on desktop */
  align-items: center;
  overflow: hidden;
  background-color: var(--secondary-color); /* Different 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(--text-main);
  text-decoration: none;
  font-size: 16px;
  padding: 8px 0;
  white-space: nowrap;
  transition: color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--gold-color);
}

/* Hamburger Menu (hidden on desktop) */
.hamburger-menu {
  display: none; /* Hidden globally */
  width: 30px;
  height: 24px;
  position: relative;
  cursor: pointer;
  z-index: 1002; /* Above logo on mobile */
  flex-shrink: 0;
}

.hamburger-menu span {
  display: block;
  height: 3px;
  width: 100%;
  background: var(--text-main);
  border-radius: 3px;
  position: absolute;
  left: 0;
  transition: all 0.3s ease;
}

.hamburger-menu span:nth-child(1) { top: 0; }
.hamburger-menu span:nth-child(2) { top: 10px; }
.hamburger-menu span:nth-child(3) { top: 20px; }

.hamburger-menu.active span:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}
.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
}
.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-10px) rotate(-45deg);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: all 0.3s ease;
  white-space: nowrap;
  box-sizing: border-box;
  color: var(--text-main); /* Default text color for buttons */
  background: var(--button-gradient); /* Custom button gradient */
  border: 1px solid var(--border-color); /* Add a subtle border */
}

.btn:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 10px var(--glow-color);
}

/* Overlay for mobile menu */
.overlay {
  display: none; /* Hidden globally */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
}

.overlay.active {
  display: block;
}

/* Footer */
.site-footer {
  background-color: var(--card-bg); /* Use card background for footer */
  padding: 40px 0 20px;
  color: var(--text-secondary);
  font-size: 14px;
  border-top: 1px solid var(--divider-color);
}

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

.footer-col h3 {
  color: var(--text-main);
  font-size: 16px;
  margin-bottom: 15px;
  border-bottom: 1px solid var(--divider-color);
  padding-bottom: 8px;
}

.footer-col p {
  line-height: 1.6;
  margin-bottom: 15px;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--gold-color);
  text-decoration: none;
  display: block;
  margin-bottom: 15px;
}

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

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

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--divider-color);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  color: var(--text-secondary);
}

.footer-bottom a { /* Ensure no links in footer-bottom */
  display: none;
}

/* Footer slot anchors - ensure they are visible for content injection */
.footer-slot-anchor-inner {
  min-height: 1px; /* Ensure they take up minimal space if empty */
  width: 100%;
  box-sizing: border-box;
}

/* Responsive Styles */
@media (max-width: 768px) {
  :root {
    --header-offset: 110px; /* Mobile: 60px (header-top) + 48px (main-nav) + 2px */
  }

  /* Mobile Header */
  .header-top {
    height: 60px; /* Mobile fixed height */
    padding: 0 15px; /* Adjust padding for mobile */
  }

  .header-container {
    padding: 0; /* Handled by header-top padding */
    justify-content: space-between; /* Space out hamburger and logo */
    width: 100%; /* No max-width on mobile */
    max-width: none;
  }

  .hamburger-menu {
    display: block; /* Visible on mobile */
    order: 1; /* Position left */
    margin-right: auto; /* Push logo to center */
  }

  .logo {
    order: 2; /* Position center */
    flex: 1 !important; /* Allow flex to center */
    display: flex !important; /* Use flex to center image */
    justify-content: center !important;
    align-items: center !important;
    font-size: 24px; /* Adjust font size */
    max-width: calc(100% - 100px); /* Limit logo width to prevent overlap with hamburger */
  }

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

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

  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons on mobile */
    height: 48px; /* Mobile fixed height */
    padding: 0 15px;
    gap: 10px; /* Spacing between buttons */
    flex-wrap: nowrap; /* Prevent buttons from wrapping */
  }

  .mobile-nav-buttons .btn {
    flex: 1; /* Distribute space evenly */
    min-width: 0; /* Allow shrinking */
    max-width: calc(50% - 5px); /* Max width for two buttons with gap */
    padding: 8px 12px; /* Smaller padding for mobile buttons */
    font-size: 13px; /* Smaller font for mobile buttons */
    white-space: normal; /* Allow text to wrap */
    word-wrap: break-word; /* Ensure wrapping */
    overflow-wrap: break-word;
  }

  .main-nav {
    display: none; /* Hidden by default on mobile */
    position: fixed;
    top: 0; /* Starts from top of viewport */
    left: 0;
    width: 80%; /* Menu width */
    height: 100%;
    background-color: var(--deep-navy-color); /* Full dark background for menu */
    z-index: 1001; /* Above overlay */
    transform: translateX(-100%); /* Slide out from left */
    transition: transform 0.3s ease;
    flex-direction: column; /* Vertical menu */
    justify-content: flex-start;
    align-items: flex-start;
    padding-top: calc(var(--header-offset) + 20px); /* Push content below fixed header elements */
    overflow-y: auto; /* Allow scrolling for long menus */
  }

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

  .nav-container {
    flex-direction: column; /* Vertical menu items */
    align-items: flex-start;
    padding: 0 20px;
    width: 100%;
    max-width: none; /* No max-width on mobile */
  }

  .nav-link {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid var(--divider-color);
  }

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

  /* Mobile Footer */
  .footer-top-grid {
    grid-template-columns: 1fr; /* Single column layout */
    padding: 0 15px; /* Adjust padding */
  }

  .footer-col {
    margin-bottom: 20px; /* Spacing between columns */
  }

  .footer-bottom {
    padding-left: 15px;
    padding-right: 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;
  }
}

/* Ensure container max-width on desktop, full width on mobile */
@media (max-width: 768px) {
  .header-container, .nav-container, .footer-top-grid, .footer-bottom {
    max-width: none;
    width: 100%;
  }
}
/* 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;
  }
}