:root {
  --primary-color: #2F6BFF;
  --secondary-color: #6FA3FF;
  --button-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%);
  --card-bg: #FFFFFF;
  --background-color: #F4F7FB;
  --text-main-color: #1F2D3D;
  --text-black: #000000;
  --border-color: #D6E2FF;
  --glow-color: #A5C4FF;

  --header-offset: 122px; /* 68px (header-top) + 52px (main-nav) + 2px buffer */
}

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

/* Site Header */
.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: var(--card-bg); /* Use a solid background */
}

/* Header Top Area */
.header-top {
  box-sizing: border-box;
  height: 68px; /* Fixed height for desktop */
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--primary-color); /* Distinct background color */
  width: 100%;
  padding: 0 20px; /* Padding for edges */
}

.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;
}

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

.hamburger-menu .bar {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--card-bg); /* White bars */
  border-radius: 2px;
  position: absolute;
  left: 0;
  transition: all 0.3s ease-in-out;
}

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

/* Hamburger active state (X icon) */
.hamburger-menu.active .bar:nth-child(1) { transform: translateY(10px) rotate(45deg); }
.hamburger-menu.active .bar:nth-child(2) { opacity: 0; }
.hamburger-menu.active .bar:nth-child(3) { transform: translateY(-10px) rotate(-45deg); }


.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--card-bg); /* White text for logo */
  text-decoration: none;
  line-height: 1;
  display: flex; /* For potential image logo centering on mobile */
  align-items: center;
  height: 100%;
}

.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;
}

/* Mobile Nav Buttons (hidden on desktop) */
.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden on desktop */
  min-height: 48px; /* Fixed height for mobile */
  background-color: var(--secondary-color); /* Different color for mobile button bar */
  width: 100%;
  padding: 0 15px; /* Adjust padding for mobile */
  align-items: center; /* Vertically center buttons */
  justify-content: center; /* Center buttons horizontally if less than 2 */
  gap: 10px;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.05);
}

/* Main Navigation */
.main-nav {
  box-sizing: border-box;
  height: 52px; /* Fixed height for desktop */
  display: flex; /* Visible on desktop */
  align-items: center;
  overflow: hidden;
  background-color: var(--secondary-color); /* Different background color 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; /* Padding for edges */
  gap: 25px; /* Spacing between nav links */
}

.nav-link {
  color: var(--card-bg); /* White text for nav links */
  text-decoration: none;
  font-weight: bold;
  padding: 10px 0;
  transition: color 0.3s ease;
  white-space: nowrap; /* Prevent wrapping */
}

.nav-link:hover, .nav-link.active {
  color: #f0f0f0; /* Slightly lighter on hover */
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: bold;
  color: var(--card-bg); /* White text for buttons */
  background: var(--button-gradient);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  white-space: nowrap; /* Prevent text wrapping for desktop buttons */
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px; /* Limit button width on desktop */
}

.btn:hover {
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

/* Overlay for mobile menu */
.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: 999;
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

/* Footer */
.site-footer {
  background-color: var(--primary-color);
  color: var(--card-bg);
  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;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-col h3 {
  color: var(--card-bg);
  font-size: 18px;
  margin-bottom: 15px;
  position: relative;
  padding-bottom: 5px;
}

.footer-col h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 30px;
  height: 2px;
  background-color: var(--secondary-color);
}

.footer-logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--card-bg);
  text-decoration: none;
  margin-bottom: 15px;
  display: block;
}

.footer-description {
  line-height: 1.6;
  margin-bottom: 15px;
  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, 0.8);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  color: rgba(255, 255, 255, 0.7);
  max-width: 1200px;
  margin: 0 auto;
}

.footer-bottom p {
  margin: 0;
}

/* Footer slot anchors - ensure they are visible */
.footer-slot-anchor-inner {
  min-height: 1px; /* Ensure it occupies space */
}

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

  body {
    padding-top: var(--header-offset);
  }

  /* 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;
  }

  /* Header Top */
  .header-top {
    height: 60px; /* Fixed height for mobile */
    padding: 0 15px; /* Adjusted padding for mobile */
  }

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

  .hamburger-menu {
    display: block; /* Show hamburger menu on mobile */
    order: 0; /* Place hamburger first */
    margin-right: auto; /* Push logo to center */
  }

  .logo {
    flex: 1 !important; /* Allow logo to take available space */
    display: flex !important; /* Ensure flex for centering */
    justify-content: center !important; /* Center logo horizontally */
    align-items: center !important;
    order: 1; /* Place logo second */
    margin: 0 auto; /* Center it */
    max-width: calc(100% - 60px); /* Account for hamburger width */
  }

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

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

  /* Mobile Nav Buttons (visible on mobile) */
  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons on mobile */
    height: 48px; /* Fixed height for mobile button bar */
    align-items: center;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 15px; /* Adjusted padding for mobile */
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap; /* Prevent buttons from wrapping */
  }

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

  /* Main Navigation (Mobile) */
  .main-nav {
    display: none; /* Hidden by default on mobile */
    position: fixed;
    top: var(--header-offset); /* Position below fixed header and mobile buttons */
    left: 0;
    width: 75%; /* Slide-out menu width */
    max-width: 300px; /* Max width for menu */
    height: calc(100% - var(--header-offset)); /* Fill remaining height */
    background-color: var(--text-main-color); /* Dark background for mobile menu */
    flex-direction: column;
    padding: 20px 0;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
    transform: translateX(-100%); /* Slide out to the left */
    transition: transform 0.3s ease-in-out;
    overflow-y: auto; /* Allow scrolling for long menus */
    z-index: 1000; /* Below overlay */
  }

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

  .nav-container {
    flex-direction: column;
    align-items: flex-start; /* Align links to the left */
    padding: 0 20px;
    width: 100%;
    height: auto; /* Adjust height based on content */
  }

  .nav-link {
    width: 100%;
    padding: 12px 0;
    color: var(--card-bg); /* White text for menu items */
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

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

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

  .footer-top-grid {
    grid-template-columns: 1fr; /* Single column on mobile */
    margin-bottom: 20px;
    gap: 30px;
  }

  .footer-col:not(:last-child) {
    margin-bottom: 15px; /* Spacing between columns */
  }

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

/* Mobile menu active state */
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;
  }
}
/* 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;
}