:root {
  --primary-color: #E53935;
  --secondary-color: #FF5A4F;
  --card-bg: #FFFFFF;
  --bg-color: #F5F7FA;
  --text-main-color: #333333;
  --border-color: #E0E0E0;
  --header-offset: 122px; /* Desktop: 68px (top) + 52px (main-nav) + 2px buffer */
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding-top: var(--header-offset);
  color: var(--text-main-color);
  background-color: var(--bg-color);
  overflow-x: hidden;
}

body.no-scroll {
  overflow: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Site Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  background-color: var(--card-bg); /* White background for header */
}

/* Header Top */
.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--primary-color); /* Dark red for top bar */
  width: 100%;
  color: #FFFFFF; /* White text for top bar */
}

.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: #FFFFFF;
  display: block; /* Ensure logo is visible */
  white-space: nowrap;
}

.desktop-nav-buttons {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn {
  padding: 10px 20px;
  border-radius: 5px;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  box-sizing: border-box;
  cursor: pointer;
  transition: all 0.3s ease;
  color: #FFFFFF; /* White text for buttons */
  background: linear-gradient(180deg, var(--secondary-color) 0%, var(--primary-color) 100%); /* Gradient for buttons */
}

.btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* Mobile Nav Buttons (Hidden by default on desktop) */
.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden on desktop */
  min-height: 48px; /* Fixed height for mobile */
  background-color: var(--bg-color); /* Light background for mobile buttons */
  width: 100%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

/* Main Navigation */
.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex; /* Desktop default: visible, horizontal */
  align-items: center;
  overflow: hidden;
  background-color: var(--secondary-color); /* Orange for main nav */
  width: 100%;
  color: #FFFFFF; /* White text for main nav */
}

.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 {
  font-size: 16px;
  font-weight: bold;
  padding: 5px 0;
  position: relative;
  transition: color 0.3s ease;
  color: #FFFFFF;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background-color: #FFFFFF;
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Hamburger Menu (Hidden on desktop) */
.hamburger-menu {
  display: none; /* Hidden on desktop */
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 24px;
  cursor: pointer;
  z-index: 1001; /* Above header */
  position: relative;
}

.hamburger-menu span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: #FFFFFF;
  border-radius: 3px;
  transition: all 0.3s ease-in-out;
}

/* Overlay (Hidden on desktop) */
.overlay {
  display: none; /* Hidden on desktop */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 999; /* Below menu, above content */
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
}

.overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Footer */
.site-footer {
  background-color: var(--primary-color); /* Dark red for footer */
  color: #FFFFFF;
  padding: 40px 20px 20px;
  font-size: 14px;
  line-height: 1.6;
}

.site-footer a {
  color: #FFFFFF;
  transition: color 0.3s ease;
}

.site-footer a:hover {
  color: var(--secondary-color); /* Orange hover for footer links */
}

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

.footer-col h3 {
  font-size: 18px;
  margin-bottom: 15px;
  color: #FFFFFF;
}

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

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

.footer-logo {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 15px;
  display: block;
  color: #FFFFFF;
}

.footer-description {
  margin-top: 0;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: 20px;
  margin-top: 20px;
  text-align: center;
  font-size: 13px;
}

/* Anchor slots (must be visible) */
.footer-slot-anchor-inner {
  min-height: 1px; /* Ensure visibility for injection */
}

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

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

  /* Header Top */
  .header-top {
    min-height: 60px !important;
    height: 60px !important;
    position: relative; /* For absolute positioning of logo */
  }

  .header-container {
    width: 100%;
    max-width: none; /* No max-width on mobile */
    padding: 0 15px;
    justify-content: space-between; /* Hamburger left, potential space for right */
    position: static; /* Reset from relative if set globally */
  }

  /* Mobile Logo Centering */
  .logo {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-size: 24px;
    max-width: calc(100% - 70px); /* Adjust max-width to prevent overlap with hamburger */
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Hamburger Menu */
  .hamburger-menu {
    display: flex; /* Visible on mobile */
    order: -1; /* Place it at the start of flex container */
    z-index: 1002; /* Ensure it's above the logo for interaction */
  }

  .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); }

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

  /* Mobile Nav Buttons */
  .mobile-nav-buttons {
    display: flex !important; /* Visible on mobile */
    min-height: 48px;
    align-items: center;
    justify-content: center; /* Center the buttons */
    width: 100%;
    max-width: 100%; /* Ensure no overflow */
    box-sizing: border-box;
    padding: 0 15px; /* Smaller padding for mobile */
    overflow: hidden;
    gap: 10px; /* Gap between buttons */
    flex-wrap: nowrap; /* Prevent buttons from wrapping */
    background-color: var(--bg-color); /* Match header background or a neutral color */
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  }

  .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 */
    font-size: 13px; /* Smaller font size */
    white-space: normal; /* Allow text to wrap */
    word-wrap: break-word; /* Ensure long words break */
    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; /* Fixed position for mobile menu */
    top: var(--header-offset); /* Position below fixed header and mobile buttons */
    left: 0;
    width: 80%; /* Menu takes 80% width */
    max-width: 300px; /* Max width for menu */
    height: calc(100% - var(--header-offset)); /* Full height below header */
    background-color: var(--secondary-color); /* Orange background for mobile menu */
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2);
    transform: translateX(-100%); /* Start off-screen */
    transition: transform 0.3s ease;
    z-index: 1001; /* Above overlay */
    overflow-y: auto; /* Scrollable if content is long */
    padding: 20px 0;
    align-items: flex-start; /* Align menu items to the left */
  }

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

  .nav-container {
    flex-direction: column;
    width: 100%;
    max-width: none;
    padding: 0;
    gap: 0; /* No gap for vertical menu */
    align-items: flex-start;
  }

  .nav-link {
    width: 100%;
    padding: 12px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 16px;
    color: #FFFFFF;
  }
  .nav-link:last-child {
    border-bottom: none;
  }
  .nav-link::after { /* Remove underline animation for mobile */
    display: none;
  }
  .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
  }

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

  .footer-col {
    text-align: center; /* Center footer content on mobile */
  }

  .footer-logo {
    margin-bottom: 10px;
  }
}
/* 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;
}