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

html {
  scroll-behavior: smooth;
}

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

/* Base styles for header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
  background-color: var(--card-bg-color); /* Neutral background for the whole fixed header */
}

/* Header Top Area */
.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--primary-color); /* Main Red */
  width: 100%;
}

.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; /* White for contrast on red background */
  text-decoration: none;
  display: block; /* Ensure it takes up space for flex alignment */
}

.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 {
  box-sizing: border-box;
  display: none; /* Hidden by default on desktop */
  min-height: 48px;
  background-color: var(--bg-color); /* Light background for mobile buttons */
  width: 100%;
  padding: 0 15px;
  border-bottom: 1px solid var(--border-color);
}

/* Main Navigation Area */
.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex; /* Desktop: visible and flex row */
  align-items: center;
  overflow: hidden;
  background-color: var(--secondary-color); /* Secondary Orange-Red */
  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;
}

.nav-link {
  color: #FFFFFF; /* White for contrast on orange-red background */
  text-decoration: none;
  padding: 10px 15px;
  font-weight: bold;
  transition: background-color 0.3s ease;
  white-space: nowrap;
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

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

.hamburger-menu .bar {
  width: 100%;
  height: 3px;
  background-color: #FFFFFF;
  transition: all 0.3s ease;
}

/* Mobile Spacer (hidden on desktop) */
.mobile-spacer {
  display: none; /* Hidden by default on desktop */
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 25px;
  text-decoration: none;
  color: #FFFFFF;
  font-weight: bold;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  background: linear-gradient(180deg, var(--secondary-color) 0%, var(--primary-color) 100%);
  border: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

/* Footer Styles */
.site-footer {
  background-color: var(--primary-color); /* Main Red */
  color: #FFFFFF;
  padding: 40px 20px 20px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

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

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

.footer-col .footer-description {
  font-size: 14px;
  line-height: 1.6;
  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: #FFFFFF;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s ease;
}

.footer-nav a:hover {
  color: var(--secondary-color); /* Orange-Red on hover */
}

.footer-bottom {
  text-align: center;
  margin-top: 20px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
}

/* Dynamic Slot Anchors (hidden, for system injection) */
.footer-slot-anchor-inner {
  display: none; /* Hide the anchor divs themselves */
}

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

  /* Mobile Header Top */
  .header-top {
    min-height: 60px !important;
    height: 60px !important;
  }

  .header-container {
    padding: 0 15px;
    width: 100%;
    max-width: none; /* Crucial for mobile full width */
    justify-content: space-between; /* Default for hamburger + logo + spacer */
    position: relative; /* For absolute positioning of logo */
  }

  .hamburger-menu {
    display: flex; /* Show hamburger on mobile */
  }

  .mobile-spacer {
    display: block; /* Balance logo centering */
    width: 30px; /* Same width as hamburger for balance */
    height: 24px;
  }

  /* Mobile Logo Centering (Method 1: Flexbox with absolute positioning for robust centering) */
  .logo {
    flex: 1 !important; /* Allow logo to take available space */
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    position: absolute !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    max-width: calc(100% - 100px); /* Adjust max-width to not overlap hamburger/spacer */
    font-size: 24px; /* Slightly smaller on mobile */
  }
  
  .logo img {
    max-height: 56px !important;
  }

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

  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons on mobile */
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: nowrap; /* Prevent buttons from wrapping */
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 15px;
    overflow: hidden;
  }

  .mobile-nav-buttons .btn {
    flex: 1;
    min-width: 0;
    max-width: calc(50% - 5px); /* Account for 10px gap */
    box-sizing: border-box;
    padding: 8px 12px;
    font-size: 13px;
    white-space: normal; /* Allow text wrapping */
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  /* Mobile Main Navigation */
  .main-nav {
    display: none; /* Hidden by default on mobile */
    position: fixed;
    top: var(--header-offset); /* Position below fixed 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); /* Menu background */
    flex-direction: column;
    padding: 20px 0;
    box-shadow: 2px 0 5px rgba(0,0,0,0.3);
    transform: translateX(-100%); /* Slide out to the left */
    transition: transform 0.3s ease;
    overflow-y: auto; /* Enable scrolling for long menus */
    z-index: 1001;
  }

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

  .nav-container {
    flex-direction: column;
    padding: 0;
    max-width: none;
    width: 100%;
    height: auto; /* Allow content to define height */
  }

  .nav-link {
    width: 100%;
    padding: 12px 20px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  /* Hamburger menu animation */
  .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);
  }

  /* 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;
  }

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

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

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

  .footer-col {
    text-align: center;
  }

  .footer-col h3 {
    margin-top: 20px;
  }

  .footer-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  /* Mobile image 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;
  }
}
/* 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;
}