:root {
  --primary-color: #26A9E0;
  --secondary-color: #FFFFFF;
  --login-button-color: #EA7C07;
  --header-offset: 122px; /* Desktop: 68px (header-top) + 52px (main-nav) + 2px buffer */
}

body {
  padding-top: var(--header-offset);
  margin: 0;
  font-family: Arial, sans-serif;
  color: #333333; /* Default text color */
}

a {
  text-decoration: none;
  color: var(--primary-color);
}

.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(--secondary-color); /* Base header background */
}

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

.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 by default on desktop */
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 25px;
  cursor: pointer;
  padding: 5px;
  box-sizing: content-box;
}

.hamburger-menu span {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--secondary-color);
  transition: all 0.3s ease;
}

.hamburger-menu.active span:nth-child(1) {
  transform: translateY(11px) rotate(45deg);
}

.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-11px) rotate(-45deg);
}

.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--secondary-color);
  text-decoration: none;
  display: block;
  padding: 5px 0; /* Adjust padding for text logo */
}

.logo img {
  display: block;
  max-height: 60px;
  height: auto;
  width: auto;
  max-width: 280px;
  object-fit: contain;
}

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

.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.3s ease, transform 0.2s ease;
  white-space: nowrap;
  box-sizing: border-box;
  font-size: 15px;
  line-height: 1.2;
}

.btn-login {
  background-color: var(--login-button-color);
  color: var(--secondary-color);
}

.btn-register {
  background-color: var(--secondary-color);
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn:hover {
  transform: translateY(-2px);
}

.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex; /* Visible on desktop */
  align-items: center;
  overflow: hidden;
  background-color: #3AAFE6; /* Lighter primary color for main nav */
  width: 100%;
  padding: 0 20px; /* Default padding for desktop */
}

.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;
  gap: 25px;
}

.nav-link {
  color: var(--secondary-color);
  font-weight: bold;
  padding: 5px 0;
  position: relative;
}

.nav-link:hover {
  color: #E0F2F7; /* Lighter shade on hover */
}

/* Mobile specific button container, hidden on desktop */
.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden by default on desktop */
  min-height: 48px;
  align-items: center;
  justify-content: center;
  width: 100%;
  background-color: #F0F8FF; /* A very light background for this section */
  padding: 10px 20px; /* Default padding for desktop, will be overridden for mobile */
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.mobile-menu-overlay {
  display: none; /* Hidden by default */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 999;
}

/* Footer Styles */
.site-footer {
  background-color: #222222; /* Dark background for footer */
  color: #BBBBBB;
  padding: 40px 20px 20px;
  font-size: 14px;
}

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

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary-color);
  margin-bottom: 15px;
  display: block;
}

.footer-description {
  line-height: 1.6;
  margin-bottom: 20px;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.footer-heading {
  font-size: 16px;
  color: var(--secondary-color);
  margin-bottom: 15px;
  text-transform: uppercase;
}

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

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

.footer-nav a {
  color: #BBBBBB;
  transition: color 0.3s ease;
}

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

.footer-slot-anchor-inner {
  margin-top: 15px; /* Provide some spacing for injected content */
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid #333333;
  color: #999999;
}

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

  body {
    padding-top: var(--header-offset);
    overflow-x: hidden; /* Prevent horizontal scrolling */
  }

  .site-header {
    box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  }

  .header-top {
    min-height: 60px;
    height: 60px;
    padding: 0 15px;
    position: relative; /* For absolute logo centering if needed, using flex for now */
  }

  .header-container {
    padding: 0; /* Reset container padding, use header-top padding */
    justify-content: flex-start; /* Adjust for hamburger menu */
  }

  .hamburger-menu {
    display: flex; /* Visible on mobile */
    z-index: 1001; /* Above header */
    margin-right: 15px; /* Space between hamburger and logo */
  }

  /* Image LOGO centering for mobile - Method 1 (flexbox) */
  .logo {
    flex: 1 !important;
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    padding: 0; /* Reset padding for flex centering */
    max-width: calc(100% - 60px); /* Account for hamburger menu width */
  }

  .logo img {
    max-height: 56px !important; /* Mobile max-height */
    max-width: 100%;
  }

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

  .mobile-nav-buttons {
    display: flex !important; /* Visible on mobile */
    min-height: 48px;
    align-items: center;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 10px 15px; /* Reduced padding for mobile */
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap; /* Ensure buttons stay in one line */
    background-color: #F0F8FF; /* Consistent light background */
  }

  .mobile-nav-buttons .btn {
    flex: 1;
    min-width: 0;
    max-width: calc(50% - 5px); /* For two buttons with 10px gap */
    padding: 8px 12px;
    font-size: 13px;
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
    line-height: 1.2;
  }

  .main-nav {
    min-height: unset; /* Allow content to dictate height */
    height: auto; /* Allow content to dictate height */
    display: none; /* Hidden by default on mobile */
    flex-direction: column; /* Vertical layout for mobile menu */
    position: fixed;
    top: var(--header-offset); /* Position below fixed header */
    left: 0;
    width: 75%; /* Menu takes 75% of screen width */
    max-width: 300px; /* Max width for mobile menu */
    height: calc(100% - var(--header-offset)); /* Full height below header */
    background-color: #3AAFE6; /* Consistent menu background */
    transform: translateX(-100%); /* Slide out from left */
    transition: transform 0.3s ease;
    z-index: 1000;
    overflow-y: auto; /* Enable scrolling for long menus */
    box-shadow: 2px 0 5px rgba(0,0,0,0.2);
    padding: 20px 0;
  }

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

  .nav-container {
    flex-direction: column; /* Vertical links */
    justify-content: flex-start; /* Align links to top */
    align-items: flex-start; /* Align links to left */
    gap: 15px;
    width: 100%; /* Take full width of the menu */
    max-width: none; /* No max-width on mobile container */
    padding: 0 20px;
  }

  .nav-link {
    width: 100%;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  .mobile-menu-overlay.active {
    display: block; /* Show overlay when menu is active */
    z-index: 999;
  }

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

  .footer-col {
    align-items: flex-start;
    text-align: left;
  }

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

  .footer-bottom {
    padding: 15px 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%;
  }
}
/* 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;
  }
}