:root {
  --header-offset: 122px; /* Desktop: 68px (header-top) + 52px (main-nav) = 120px + 2px buffer */
  --primary-color: #E53935;
  --secondary-color: #FF5A4F;
  --text-main-color: #333333;
  --card-bg-color: #FFFFFF;
  --page-bg-color: #F5F7FA;
  --border-color: #E0E0E0;
  --button-gradient: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
}

body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text-main-color);
  background-color: var(--page-bg-color);
  padding-top: var(--header-offset); /* Mandatory padding for fixed header */
  overflow-x: hidden;
}
body.no-scroll {
  overflow: hidden;
}

/* Site Header - Fixed Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  background-color: var(--card-bg-color); /* Neutral background for the whole header block */
}

/* Header Top - Logo and Desktop Buttons */
.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--primary-color); /* Distinct background for top section */
  color: #FFFFFF;
  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: 24px;
  font-weight: bold;
  color: #FFFFFF; /* Logo text color */
  text-decoration: none;
  white-space: nowrap;
}
.logo img {
  display: block;
  max-height: 60px; /* Max height for logo image on desktop */
  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 */
  min-height: 48px; /* Fixed height for mobile button bar */
  background-color: #f8f8f8; /* A light background for mobile button bar */
  width: 100%;
  align-items: center;
  justify-content: center;
  padding: 0 15px; /* Add padding for mobile buttons */
  gap: 10px; /* Gap between mobile buttons */
}

/* Main Navigation - Menu Links */
.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex; /* Desktop: visible by default */
  align-items: center;
  overflow: hidden;
  background-color: var(--secondary-color); /* Distinct background for main nav */
  width: 100%;
}

.nav-container {
  box-sizing: border-box;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row; /* Desktop: horizontal */
  justify-content: center;
  align-items: center;
  padding: 0 20px;
  flex-wrap: nowrap; /* Prevent wrapping on desktop */
}

.nav-link {
  color: #FFFFFF;
  text-decoration: none;
  padding: 10px 15px;
  white-space: nowrap;
  transition: background-color 0.3s ease;
  font-size: 15px;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 8px;
  background: var(--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);
}

/* Hamburger Menu - Hidden by default on desktop */
.hamburger-menu {
  display: none; /* Hidden on desktop */
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: 1001; /* Above header-top content */
}

.hamburger-menu .bar {
  display: block;
  width: 100%;
  height: 3px;
  background-color: #FFFFFF; /* Color of hamburger bars */
  border-radius: 2px;
  position: absolute;
  left: 0;
  transition: all 0.3s ease;
}

.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-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);
}

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

/* Footer Styles */
.site-footer {
  background-color: var(--primary-color); /* Primary color for footer background */
  color: #FFFFFF;
  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; /* Add some padding before the bottom part */
  border-bottom: 1px solid rgba(255, 255, 255, 0.1); /* Subtle separator */
}

.footer-col h3 {
  font-size: 18px;
  margin-top: 0;
  margin-bottom: 15px;
  color: var(--secondary-color); /* Highlight footer headings */
}

.footer-logo {
  font-size: 22px;
  font-weight: bold;
  color: #FFFFFF;
  text-decoration: none;
  display: block;
  margin-bottom: 15px;
}

.footer-description {
  line-height: 1.6;
  margin-bottom: 15px;
  word-wrap: break-word; /* Ensure description wraps */
  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;
  transition: color 0.2s ease;
}

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

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

.footer-bottom p {
  margin: 0;
}

/* Dynamic Slot Anchor Styling (ensure visibility) */
.footer-slot-anchor-inner {
  min-height: 1px; /* Ensure it takes up space if needed for layout */
}

/* Mobile Styles */
@media (max-width: 768px) {
  :root {
    --header-offset: 110px; /* Mobile: 60px (header-top) + 48px (mobile-nav-buttons) = 108px + 2px buffer */
  }

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

  .header-container {
    width: 100%;
    max-width: none;
    padding: 0 15px;
    justify-content: flex-start; /* Align items to start for hamburger */
    position: relative;
  }

  /* Hamburger Menu - Visible on mobile */
  .hamburger-menu {
    display: block;
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
  }
  .hamburger-menu .bar {
    background-color: #FFFFFF;
  }

  /* Logo Centering on Mobile (Text Logo) */
  .logo {
    flex: 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    padding: 0 40px; /* Add padding to prevent logo from overlapping hamburger/buttons */
  }
  .logo img {
    max-height: 56px !important; /* Max height for logo image on mobile */
  }

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

  /* Mobile Buttons - Visible on mobile */
  .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: 0 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: #f8f8f8;
  }

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

  /* Main Nav Mobile Adjustments - Hidden by default, slides in */
  .main-nav {
    min-height: auto !important;
    height: auto !important;
    position: fixed;
    top: var(--header-offset); /* Start below the fixed header */
    left: 0;
    width: 80%;
    max-width: 300px;
    height: calc(100vh - var(--header-offset)); /* Full height minus header */
    overflow-y: auto;
    background-color: var(--card-bg-color);
    transform: translateX(-100%); /* Hidden off-screen by default */
    transition: transform 0.3s ease;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
    display: none; /* Crucial: Hidden by default */
    flex-direction: column;
    align-items: flex-start;
  }

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

  .nav-container {
    width: 100%;
    max-width: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 10px 0;
  }

  .nav-link {
    width: 100%;
    padding: 12px 20px;
    color: var(--text-main-color);
    background-color: transparent;
  }
  .nav-link:hover, .nav-link.active {
    background-color: var(--page-bg-color);
  }

  /* Footer Mobile Adjustments */
  .site-footer {
    padding: 30px 15px 15px;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
    margin-bottom: 20px;
    border-bottom: none;
  }
  .footer-col {
    margin-bottom: 20px;
  }
  .footer-col:last-child {
    margin-bottom: 0;
  }

  /* 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 already set to hidden globally */
}
/* 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;
  }
}