/* General Reset & Body */
body {
  margin: 0;
  font-family: 'Arial', sans-serif;
  color: var(--text-main);
  line-height: 1.6;
  padding-top: var(--header-offset);
  overflow-x: hidden; /* Prevent horizontal scroll on body */
}
:root {
  --primary-color: #E53935;
  --secondary-color: #FF5A4F;
  --dark-red: #C62828;
  --text-main: #333333;
  --card-bg: #FFFFFF;
  --page-bg: #F5F7FA;
  --border-color: #E0E0E0;
  --header-offset: 122px; /* Desktop: header-top (68px) + main-nav (52px) + 2px buffer */
}

/* 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(--dark-red); /* Fallback, specific sections have their own */
  box-sizing: border-box;
  overflow-x: hidden; /* Prevent horizontal scroll within header */
}

/* Header Top */
.header-top {
  box-sizing: border-box;
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--dark-red); /* Darker red for header top */
  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; /* Padding for logo and buttons */
}

.logo {
  color: var(--card-bg);
  text-decoration: none;
  font-size: 24px;
  font-weight: bold;
  display: block;
  line-height: 1;
}
.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; /* Minimum height for consistency */
  background-color: var(--page-bg); /* Neutral background for mobile buttons */
  padding: 8px 15px;
  justify-content: center;
}

/* Main Navigation */
.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background-color: var(--secondary-color); /* Auxiliary color for main nav */
  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: var(--card-bg);
  text-decoration: none;
  padding: 10px 15px;
  font-size: 16px;
  font-weight: 500;
  white-space: nowrap;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.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: 5px;
  text-decoration: none;
  font-weight: bold;
  color: var(--card-bg);
  background: linear-gradient(180deg, #FF5A4F 0%, #E53935 100%);
  border: none;
  cursor: pointer;
  transition: opacity 0.3s ease, transform 0.3s ease;
  white-space: nowrap;
  box-sizing: border-box;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

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

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

.hamburger-icon,
.hamburger-icon::before,
.hamburger-icon::after {
  display: block;
  background-color: var(--card-bg);
  height: 3px;
  width: 100%;
  position: absolute;
  transition: all 0.3s ease-in-out;
}

.hamburger-icon::before,
.hamburger-icon::after {
  content: '';
}

.hamburger-icon::before {
  top: -8px;
}

.hamburger-icon::after {
  top: 8px;
}

.hamburger-menu.active .hamburger-icon {
  transform: rotate(45deg);
}

.hamburger-menu.active .hamburger-icon::before {
  top: 0;
  opacity: 0;
}

.hamburger-menu.active .hamburger-icon::after {
  top: 0;
  transform: rotate(-90deg);
}

/* Overlay for mobile menu */
.overlay {
  display: none;
  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;
}

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

  /* Mobile Header Top */
  .header-top {
    min-height: 60px !important;
    height: 60px !important;
    padding: 0 15px; /* Adjust padding for mobile */
  }
  
  .header-container {
    width: 100%;
    max-width: none;
    padding: 0;
    justify-content: flex-start; /* Reset desktop justify for mobile */
  }

  .hamburger-menu {
    display: block;
    margin-right: auto; /* Push logo to center */
  }

  .logo {
    flex: 1 !important; /* Allow logo to take available space for centering */
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    margin-left: -30px; /* Offset hamburger width to truly center */
    padding-left: 30px; /* Compensate for negative margin */
  }
  .logo img {
    max-height: 56px !important;
  }

  .desktop-nav-buttons {
    display: none !important;
  }

  /* Mobile Buttons Section */
  .mobile-nav-buttons {
    display: flex !important;
    align-items: center;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 8px 15px; /* Reduced padding for mobile */
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: var(--page-bg);
  }

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

  /* Mobile Main Nav (Hamburger Menu Content) */
  .main-nav {
    position: fixed;
    top: 0; /* Will be adjusted by JS to be below header */
    left: 0;
    width: 250px; /* Sidebar width */
    height: 100%;
    background-color: var(--primary-color); /* Primary color for mobile menu background */
    flex-direction: column;
    padding-top: var(--header-offset); /* Ensure content is below fixed header */
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2);
    transform: translateX(-100%); /* Hidden by default */
    transition: transform 0.3s ease;
    z-index: 1000;
    display: none; /* Initially hidden */
    overflow-y: auto;
  }

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

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

  .nav-link {
    width: 100%;
    padding: 12px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    text-align: left;
    font-size: 15px;
  }

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

  /* Mobile content area 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;
  }
}

/* Footer Styles */
.site-footer {
  background-color: var(--dark-red); /* Darker red for footer background */
  color: var(--card-bg);
  padding: 40px 20px 20px;
  font-size: 14px;
  box-sizing: border-box;
}

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

.footer-col h3 {
  color: var(--card-bg);
  font-size: 18px;
  margin-top: 0;
  margin-bottom: 15px;
}

.footer-col .footer-logo {
  color: var(--card-bg);
  text-decoration: none;
  font-size: 22px;
  font-weight: bold;
  margin-bottom: 15px;
  display: block;
}

.footer-col .footer-description {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.5;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

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

.footer-nav li {
  margin-bottom: 10px;
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-slot-anchor-inner {
  min-height: 1px; /* Ensure slot is visible for inspection */
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: 20px;
  text-align: center;
  color: rgba(255, 255, 255, 0.7);
}

.footer-bottom p {
  margin: 0;
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .site-footer {
    padding: 30px 15px 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;
  }
}