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

body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: var(--text-main);
  background-color: var(--deep-navy);
  padding-top: var(--header-offset); /* Important: only one padding-top for body */
  line-height: 1.5;
}

/* Header styles */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5); /* Floating effect */
  background-color: transparent; /* Actual background set by header-top and main-nav */
}

.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--deep-navy); /* Distinct background */
  width: 100%;
  padding: 0 20px; /* Default padding for desktop */
}

.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;
}

.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--gold-color); /* Gold color for logo */
  text-decoration: none;
  display: flex;
  align-items: center;
  white-space: nowrap; /* Prevent logo text from wrapping */
  padding-right: 20px; /* Space between logo and other elements if needed */
}

.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 - hidden by default for desktop */
.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden by default */
  min-height: 48px;
  background-color: var(--primary-color); /* Same as main-nav for consistency */
  border-top: 1px solid var(--border-color); /* Separator */
  padding: 0 20px; /* Default padding for desktop, will be overwritten by mobile */
}

.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex; /* Desktop default: flex */
  align-items: center;
  overflow: hidden;
  background-color: var(--primary-color); /* Distinct background */
  width: 100%;
}

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

.nav-link {
  color: var(--text-main);
  text-decoration: none;
  padding: 10px 15px;
  font-size: 15px;
  white-space: nowrap;
  transition: color 0.3s ease, background-color 0.3s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--gold-color);
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

/* Hamburger menu - hidden by default for desktop */
.hamburger-menu {
  display: none; /* Hidden by default */
  width: 30px;
  height: 24px;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  position: relative; /* For z-index in mobile */
  z-index: 1001; /* Above header-top content */
}

.hamburger-menu .bar {
  width: 100%;
  height: 3px;
  background-color: var(--text-main);
  transition: all 0.3s ease;
}

/* Hamburger menu active state */
.hamburger-menu.active .bar:nth-child(1) {
  transform: translateY(10.5px) rotate(45deg);
}

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

.hamburger-menu.active .bar:nth-child(3) {
  transform: translateY(-10.5px) rotate(-45deg);
}

/* Buttons */
.btn {
  background: var(--button-gradient);
  color: var(--text-main);
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  font-size: 15px;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* Menu Overlay - hidden by default */
.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 999; /* Below mobile menu, above main content */
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.menu-overlay.visible {
  opacity: 1;
  visibility: visible;
}

/* Footer styles */
.site-footer {
  background-color: var(--card-bg); /* Use card BG for footer */
  padding: 40px 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: 30px;
  max-width: 1200px;
  margin: 0 auto 30px auto;
}

.footer-col {
  display: flex;
  flex-direction: column;
}

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

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

.footer-col h3 {
  color: var(--text-main);
  font-size: 18px;
  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 {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--divider-color);
  color: var(--text-secondary);
}

.footer-bottom p {
  margin: 0;
}

/* Ensure all slot anchors are present and visible */
.footer-slot-anchor-inner {
  min-height: 10px; /* Ensure visibility for potential injected content */
  width: 100%;
}


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

  body {
    overflow-x: hidden;
  }

  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }

  .site-header {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  }

  .header-top {
    min-height: 60px;
    height: 60px;
    padding: 0 15px;
    justify-content: space-between; /* To push hamburger left and logo towards center */
  }

  .header-container {
    max-width: none; /* Remove max-width for mobile */
    padding: 0; /* Reset container padding, handled by header-top */
    position: relative; /* For absolute positioning of logo if needed */
  }

  .hamburger-menu {
    display: flex; /* Show hamburger menu */
    position: relative; /* Keep it in flow */
    z-index: 1001; /* Ensure it's clickable */
  }

  /* Mobile Logo Centering (Method 1: Flexbox) */
  .header-top .header-container .logo {
    flex: 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    max-width: calc(100% - 100px); /* Leave space for hamburger and potential right-side icons */
    padding: 0; /* Reset padding */
  }

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

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

  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons */
    min-height: 48px;
    align-items: center;
    justify-content: center; /* Center buttons horizontally */
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap; /* Ensure buttons stay in one line */
    background-color: var(--primary-color);
    border-top: 1px solid var(--border-color);
  }

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

  .main-nav {
    display: none; /* Hidden by default, shown by JS */
    position: fixed;
    top: var(--header-offset); /* Position below header */
    left: 0;
    width: 280px; /* Width of the mobile menu */
    height: calc(100% - var(--header-offset)); /* Full height below header */
    background-color: var(--primary-color);
    flex-direction: column; /* Vertical menu */
    padding: 20px 0;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
    transform: translateX(-100%); /* Slide out of view */
    transition: transform 0.3s ease;
    z-index: 1002; /* Above overlay */
    overflow-y: auto; /* Enable scrolling for long menus */
  }

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

  .nav-container {
    flex-direction: column; /* Vertical links */
    align-items: flex-start; /* Align links to the left */
    padding: 0 15px;
    max-width: none; /* Remove max-width for mobile */
    height: auto; /* Allow content to dictate height */
  }

  .nav-link {
    width: 100%;
    padding: 12px 15px;
    font-size: 16px;
    border-bottom: 1px solid var(--divider-color);
  }

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

  /* Body no-scroll for mobile menu */
  body.no-scroll {
    overflow: hidden;
  }

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

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

  .footer-col h3 {
    margin-top: 15px;
    margin-bottom: 10px;
  }

  .footer-bottom {
    padding-top: 15px;
  }
}
/* 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;
  }
}