/* General Reset & Body */
body {
  margin: 0;
  font-family: 'Arial', sans-serif;
  color: #1F2D3D;
  background-color: #F4F7FB;
  line-height: 1.6;
  overflow-x: hidden; /* Prevent horizontal scroll for body */
}

/* Header Offset for Fixed Header */
:root {
  --header-offset: 122px; /* Desktop: header-top(68) + main-nav(52) = 120 + 2px buffer */
}
body {
  padding-top: var(--header-offset);
}

/* Site Header - Fixed Navigation */
.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);
  background-color: #F4F7FB; /* Base background for the entire header */
}

/* Header Top Section */
.header-top {
  box-sizing: border-box;
  height: 68px; /* Desktop fixed height */
  display: flex;
  align-items: center;
  background-color: #2F6BFF; /* Primary brand color for top bar */
  color: #FFFFFF;
  overflow: hidden;
}

.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 from container edge */
}

/* Logo Styling */
.logo {
  font-size: 28px;
  font-weight: bold;
  color: #FFFFFF;
  text-decoration: none;
  display: flex;
  align-items: center;
  height: 100%;
}
.logo img {
  display: block;
  max-height: 60px; /* Desktop logo max height */
  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 on desktop */
  min-height: 48px; /* Mobile fixed height */
  background-color: #F4F7FB; /* A neutral background, or secondary color */
  border-bottom: 1px solid #D6E2FF;
}

/* Hamburger Menu */
.hamburger-menu {
  display: none; /* Hidden on desktop */
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 25px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}
.hamburger-menu .bar {
  width: 100%;
  height: 3px;
  background-color: #FFFFFF;
  transition: all 0.3s ease;
}
.hamburger-menu.active .bar:nth-child(1) {
  transform: translateY(11px) rotate(45deg);
}
.hamburger-menu.active .bar:nth-child(2) {
  opacity: 0;
}
.hamburger-menu.active .bar:nth-child(3) {
  transform: translateY(-11px) rotate(-45deg);
}

/* Main Navigation */
.main-nav {
  box-sizing: border-box;
  height: 52px; /* Desktop fixed height */
  display: flex; /* Desktop default: flex */
  align-items: center;
  background-color: #6FA3FF; /* Secondary brand color for main nav */
  overflow: hidden;
}

.nav-container {
  box-sizing: border-box;
  width: 100%;
  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;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 25px;
}

.main-nav ul li a {
  color: #FFFFFF;
  text-decoration: none;
  font-weight: bold;
  font-size: 16px;
  padding: 10px 0;
  display: block;
  transition: color 0.3s ease;
}

.main-nav ul li a:hover {
  color: #D6E2FF; /* Lighter shade for hover */
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 8px;
  background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); /* Button gradient */
  color: #FFFFFF;
  font-weight: bold;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  border: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

/* Mobile Overlay */
.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;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.mobile-overlay.active {
  display: block;
  opacity: 1;
}

/* Footer Styling */
.site-footer {
  background-color: #1F2D3D; /* Dark background for footer */
  color: #F4F7FB; /* Light text on dark background */
  padding: 40px 20px 20px;
  font-size: 14px;
  line-height: 1.8;
  overflow-x: hidden;
}

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

.footer-col h3 {
  color: #6FA3FF; /* Secondary color for footer headings */
  font-size: 18px;
  margin-bottom: 15px;
  font-weight: bold;
}

.footer-logo {
  font-size: 28px;
  font-weight: bold;
  color: #FFFFFF;
  text-decoration: none;
  display: block;
  margin-bottom: 15px;
}

.footer-description {
  margin-top: 0;
  color: #D6E2FF;
  word-wrap: break-word; /* Ensure text wraps */
  overflow-wrap: break-word;
}

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

.footer-nav li a {
  color: #D6E2FF;
  text-decoration: none;
  display: block;
  padding: 5px 0;
  transition: color 0.3s ease;
}

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

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

.footer-bottom p {
  margin: 0;
}

/* Footer Slot Anchors - Must remain visible */
.footer-slot-anchor-inner {
  /* Ensures these divs are not hidden by default */
  min-height: 1px; /* Smallest possible height to ensure rendering */
  visibility: visible;
  opacity: 1;
}

/* Responsive Design for Mobile */
@media (max-width: 768px) {
  /* Header Offset for Fixed Header on Mobile */
  :root {
    --header-offset: 110px; /* Mobile: header-top(60) + mobile-nav-buttons(48) = 108 + 2px buffer */
  }

  /* Body overflow for mobile content 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;
  }

  /* Header Top Section on Mobile */
  .header-top {
    height: 60px; /* Mobile fixed height */
    padding: 0 15px;
  }

  .header-container {
    padding: 0;
    justify-content: space-between; /* Hamburger left, Logo center, buttons right space */
    position: relative; /* For logo absolute positioning */
  }

  /* Mobile Logo Centering (Method 1: Flexbox) */
  .logo {
    flex: 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    position: absolute; /* To allow hamburger on left */
    left: 50%;
    transform: translateX(-50%);
    max-width: calc(100% - 100px); /* Leave space for hamburger */
  }
  .logo img {
    max-height: 56px !important; /* Mobile logo max height */
  }

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

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

  /* Mobile Navigation Buttons */
  .mobile-nav-buttons {
    display: flex !important; /* Show on mobile */
    min-height: 48px; /* Mobile fixed height */
    align-items: center;
    justify-content: center; /* Center buttons if only one */
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 15px; /* Padding for buttons from screen edge */
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap; /* Ensure buttons stay in one row */
  }
  .mobile-nav-buttons .btn {
    flex: 1; /* Distribute space evenly */
    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;
  }

  /* Main Navigation on Mobile (Hamburger Menu) */
  .main-nav {
    display: none; /* Hidden by default on mobile */
    position: fixed;
    top: var(--header-offset); /* Position below fixed header + mobile buttons */
    left: 0;
    width: 280px; /* Width of the mobile menu */
    height: calc(100% - var(--header-offset));
    background-color: #2F6BFF; /* Primary color for mobile menu background */
    flex-direction: column; /* Vertical menu items */
    transform: translateX(-100%); /* Slide out to the left */
    transition: transform 0.3s ease-in-out;
    z-index: 1001;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
  }

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

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

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

  .main-nav ul li {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  .main-nav ul li a {
    padding: 15px 10px;
    font-size: 15px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-col {
    text-align: center;
  }

  .footer-col h3 {
    margin-top: 0;
  }

  .footer-nav li a {
    padding: 8px 0;
  }

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