:root {
  --primary-color: #113B7A;
  --secondary-color: #1D5FD1;
  --card-bg: #10233F;
  --text-main: #F3F8FF;
  --text-secondary: #AFC4E8;
  --border-color: #244D84;
  --glow-color: #4FA8FF;
  --gold-color: #F2C14E;
  --divider-color: #1B3357;
  --deep-navy: #08162B;
  --header-offset: 122px; /* 68px (header-top) + 52px (main-nav) + 2px buffer */
}

/* Base Styles */
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: var(--text-main);
  background-color: var(--card-bg); /* Default background for content */
  padding-top: var(--header-offset); /* Fixed header offset */
  overflow-x: hidden; /* Prevent body horizontal scroll */
}

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

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

/* 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: transparent; /* Background set by child elements */
}

/* Header Top Area */
.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--deep-navy); /* Deep Navy for header top */
  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-transform: uppercase;
  display: flex; /* For potential image centering if needed */
  align-items: center;
  height: 100%;
}

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

/* Desktop Navigation Buttons */
.desktop-nav-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* Mobile Navigation Buttons (hidden by default on desktop) */
.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden by default on desktop */
  min-height: 48px;
  background-color: var(--primary-color); /* Matches main-nav for consistency */
  border-bottom: 1px solid var(--divider-color);
  padding: 0 20px; /* Default padding for desktop, will be overridden for mobile */
}

/* Main Navigation */
.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); /* Primary blue for main nav */
  width: 100%;
  padding: 0 20px; /* Default padding for desktop */
}

.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;
  width: 100%;
}

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

.main-nav ul li a {
  color: var(--text-main);
  font-weight: bold;
  padding: 10px 0;
  transition: color 0.3s ease;
  white-space: nowrap; /* Prevent menu items from wrapping */
}

.main-nav ul li a:hover {
  color: var(--gold-color); /* Gold on hover */
}

/* Hamburger Menu (hidden by default on desktop) */
.hamburger-menu {
  display: none; /* Hidden by default on desktop */
  width: 30px;
  height: 24px;
  position: relative;
  cursor: pointer;
  z-index: 1001; /* Above header */
  flex-shrink: 0; /* Prevent shrinking */
}

.hamburger-menu span {
  display: block;
  height: 3px;
  width: 100%;
  background: var(--gold-color);
  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: 50%; transform: translateY(-50%); }
.hamburger-menu span:nth-child(3) { bottom: 0; }

.hamburger-menu.active span:nth-child(1) { top: 50%; transform: translateY(-50%) rotate(45deg); }
.hamburger-menu.active span:nth-child(2) { opacity: 0; }
.hamburger-menu.active span:nth-child(3) { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

/* Buttons */
.btn {
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: bold;
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-main); /* Text main for button text */
  text-decoration: none; /* No underline for buttons */
  background: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%); /* Button gradient */
  border: 1px solid var(--border-color); /* Border for buttons */
}

.btn:hover {
  opacity: 0.9;
  box-shadow: 0 0 10px var(--glow-color); /* Glow on hover */
}

/* Mobile Menu Overlay (hidden by default) */
.mobile-menu-overlay {
  display: none; /* Hidden by default */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  z-index: 999;
}

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

/* Footer Styles */
.site-footer {
  background-color: var(--deep-navy); /* Deep Navy for footer */
  color: var(--text-secondary);
  padding: 40px 20px 20px;
  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 30px;
}

.footer-col h3 {
  color: var(--text-main);
  font-size: 18px;
  margin-bottom: 15px;
}

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

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

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

.footer-nav li a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 20px;
  border-top: 1px solid var(--divider-color);
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
}

/* Dynamic slot anchor inner - must be visible */
.footer-slot-anchor-inner {
  min-height: 1px; /* Ensure it takes up minimal space but is renderable */
  /* No display:none, visibility:hidden, opacity:0, height:0, max-height:0, overflow:hidden */
}

/* Prevent body scroll when mobile menu is open */
body.no-scroll {
  overflow: hidden;
}

/* Responsive Styles */
@media (max-width: 768px) {
  :root {
    --header-offset: 110px; /* 60px (header-top) + 48px (mobile-nav-buttons) + 2px buffer */
  }
  body {
    padding-top: var(--header-offset);
    overflow-x: hidden;
  }

  /* Header Top */
  .header-top {
    min-height: 60px !important;
    height: 60px !important;
    padding: 0 15px; /* Smaller padding for mobile */
  }

  .header-container {
    width: 100%;
    max-width: none;
    padding: 0;
    display: flex; /* Make container a flex container */
    justify-content: space-between; /* Space out hamburger and logo */
    align-items: center;
  }

  .logo {
    flex: 1 !important; /* Allow logo to take up available space */
    display: flex !important;
    justify-content: center !important; /* Center its content (the text/image) */
    align-items: center !important;
    max-width: calc(100% - 100px); /* Leave space for hamburger */
  }

  .logo img {
    max-height: 56px !important; /* Max height for mobile logo */
    max-width: 100%; /* Ensure image fits */
  }

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

  /* Mobile Navigation Buttons */
  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons */
    min-height: 48px;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding-left: 15px;
    padding-right: 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap; /* Keep buttons in a single line */
    background-color: var(--deep-navy); /* Match header-top for mobile */
  }

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

  /* Main Navigation (Mobile) */
  .main-nav {
    display: none; /* Hidden by default on mobile */
    flex-direction: column; /* Vertical layout for mobile menu */
    position: fixed;
    top: var(--header-offset); /* Position below fixed header */
    left: 0;
    width: 80%; /* Menu width */
    max-width: 300px; /* Max width for mobile menu */
    height: calc(100vh - var(--header-offset)); /* Full height below header */
    background-color: var(--primary-color);
    transform: translateX(-100%); /* Off-screen by default */
    transition: transform 0.3s ease;
    overflow-y: auto; /* Scroll for long menus */
    padding: 20px 0;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
  }

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

  .nav-container {
    flex-direction: column;
    width: 100%;
    max-width: none;
    padding: 0 15px;
    height: auto;
  }

  .main-nav ul {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }

  .main-nav ul li {
    border-bottom: 1px solid var(--divider-color);
    width: 100%;
  }

  .main-nav ul li:last-child {
    border-bottom: none;
  }

  .main-nav ul li a {
    display: block;
    padding: 15px 0;
    text-align: left;
    width: 100%;
  }

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

  /* Content area image overflow prevention */
  .page-content img {
    max-width: 100% !important;
    height: auto !important;
    display: block;
  }
  .page-content {
    overflow-x: hidden;
    max-width: 100%;
  }

  /* Footer */
  .site-footer {
    padding-left: 15px;
    padding-right: 15px;
  }

  .footer-top-grid {
    grid-template-columns: 1fr; /* Single column on mobile */
    gap: 30px;
  }
}
/* 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;
  }
}
/* 内容保护（系统追加，请勿删除） */
body {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
input, textarea, select, [contenteditable="true"] {
  -webkit-user-select: text;
  -moz-user-select: text;
  user-select: text;
}