/* General Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #1F2D3D; /* Text Main */
  background-color: #F4F7FB; /* Background */
  padding-top: var(--header-offset); /* Fixed header offset */
  overflow-x: hidden; /* Prevent horizontal scroll on desktop */
}

a {
  text-decoration: none;
  color: #2F6BFF; /* Main color for links */
}

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

/* Header Variables */
:root {
  --header-offset: 122px; /* Desktop: 68px (header-top) + 52px (main-nav) + 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: transparent; /* Background handled by header-top and main-nav */
}

/* Header Top Section */
.header-top {
  background-color: #2F6BFF; /* Main color */
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  width: 100%;
}

.header-container {
  width: 100%;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 30px; /* Added padding to container as per prompt's 20-40px suggestion */
}

/* Logo */
.logo {
  font-size: 28px;
  font-weight: bold;
  color: #FFFFFF; /* White for contrast on main color background */
  text-transform: uppercase;
  display: flex; /* For vertical centering of text logo */
  align-items: center;
  text-decoration: none;
}

/* Desktop Navigation Buttons */
.desktop-nav-buttons {
  display: flex; /* Default for desktop */
  gap: 12px;
  align-items: center;
}

/* Mobile Navigation Buttons - Hidden by default on desktop */
.mobile-nav-buttons {
  box-sizing: border-box;
  display: none; /* Hidden on desktop */
  min-height: 48px; /* Placeholder height, actual height set by content */
  background-color: #F4F7FB; /* Background color for mobile buttons */
  padding: 10px 15px; /* Padding for mobile buttons */
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

/* Main Navigation */
.main-nav {
  background-color: #6FA3FF; /* Auxiliary color */
  min-height: 52px;
  height: 52px;
  display: flex; /* Default for desktop */
  align-items: center;
  overflow: hidden;
  width: 100%;
}

.nav-container {
  width: 100%;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  padding: 0 30px; /* Added padding to container */
}

.nav-link {
  color: #FFFFFF; /* White for contrast on auxiliary color background */
  padding: 10px 15px;
  font-weight: bold;
  font-size: 16px;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 0.3s ease;
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  text-decoration: none;
}

/* Hamburger Menu (Hidden on Desktop) */
.hamburger-menu {
  display: none; /* Hidden on desktop */
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  position: relative;
  z-index: 1002; /* Above header-top content */
}

.hamburger-menu span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: #FFFFFF; /* White lines */
  margin: 5px 0;
  transition: all 0.3s ease;
}

/* Button Styles */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 5px;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap; /* Prevent text wrap on desktop buttons */
  color: #FFFFFF; /* White text for buttons */
  background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); /* Specified gradient */
  border: none;
}

.btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  text-decoration: none;
}

/* Mobile Navigation Overlay */
.mobile-nav-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;
}

.mobile-nav-overlay.active {
  display: block;
  opacity: 1;
}

/* Footer Styles */
.site-footer {
  background-color: #1F2D3D; /* Text Main for a darker footer */
  color: rgba(255, 255, 255, 0.7);
  padding: 40px 20px 20px;
  font-size: 14px;
}

.site-footer a {
  color: #6FA3FF; /* Auxiliary color for footer links */
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

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

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

.footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: #FFFFFF;
  text-transform: uppercase;
  margin-bottom: 15px;
  display: block;
  text-decoration: none;
}

.footer-description {
  line-height: 1.8;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

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

.footer-mid-section {
  max-width: 1200px;
  margin: 0 auto 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
}

.footer-slot-anchor-inner {
  /* Placeholder for injected content */
  min-height: 10px; /* Ensure visibility for potential injected content */
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

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

  /* Header Top */
  .header-top {
    min-height: 60px !important;
    height: 60px !important;
    padding: 0 15px; /* Smaller padding for mobile */
    position: relative; /* For absolute positioning of logo */
  }

  .header-container {
    width: 100%;
    max-width: none; /* No max-width on mobile */
    justify-content: space-between;
    padding: 0; /* No container padding as header-top has it */
  }

  /* Hamburger Menu Visible on Mobile */
  .hamburger-menu {
    display: block;
    position: relative;
    z-index: 1002;
    padding-left: 0;
  }
  .hamburger-menu span {
    background-color: #FFFFFF; /* White lines on dark header-top */
  }
  .hamburger-menu.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .hamburger-menu.active span:nth-child(2) {
    opacity: 0;
  }
  .hamburger-menu.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  /* Mobile Logo Centering (Method 2 adapted for text logo) */
  .logo {
    position: absolute !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    display: flex !important; /* For vertical centering of text */
    align-items: center !important;
    justify-content: center !important;
    max-width: calc(100% - 100px); /* Leave space for hamburger and buttons */
    height: 100%; /* Important for vertical centering within header-top */
    color: #FFFFFF; /* Ensure text color is white on dark background */
  }
  /* If logo were an image, these would apply for mobile: */
  /* .logo img {
    max-height: 56px !important;
    max-width: 100%;
  } */

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

  /* Mobile Buttons Visible on Mobile */
  .mobile-nav-buttons {
    display: flex !important; /* Visible on mobile */
    min-height: 48px;
    align-items: center;
    justify-content: center; /* Center buttons if only one, or for overall group */
    width: 100%; max-width: 100%;
    box-sizing: border-box;
    padding-left: 15px; padding-right: 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: #F4F7FB; /* Background */
  }
  .mobile-nav-buttons .btn {
    flex: 1; min-width: 0;
    max-width: calc(50% - 5px); /* For two buttons with 10px gap */
    box-sizing: border-box;
    padding: 8px 12px;
    font-size: 13px;
    white-space: normal;
    word-wrap: break-word;
    overflow-wrap: break-word;
  }

  /* Main Navigation (Mobile Menu) */
  .main-nav {
    display: none; /* Hidden by default */
    position: fixed;
    top: var(--header-offset); /* Below header-top and mobile-nav-buttons */
    left: 0;
    width: 280px; /* Sidebar width */
    height: calc(100% - var(--header-offset));
    background-color: #1F2D3D; /* Darker background for mobile menu */
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 20px 0;
    transform: translateX(-100%); /* Off-screen by default */
    transition: transform 0.3s ease;
    z-index: 1001; /* Above overlay, below hamburger */
    overflow-y: auto; /* Scrollable if many links */
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2);
  }

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

  .nav-container {
    width: 100%;
    max-width: none; /* No max-width on mobile */
    flex-direction: column;
    align-items: flex-start;
    padding: 0; /* No padding on container itself */
  }

  .nav-link {
    width: 100%;
    padding: 12px 20px;
    color: #FFFFFF;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 15px;
    text-align: left;
  }
  .nav-link:last-child {
    border-bottom: none;
  }

  /* Footer */
  .site-footer {
    padding-left: 15px;
    padding-right: 15px;
  }
  .footer-top-grid {
    grid-template-columns: 1fr; /* Single column on mobile */
    gap: 20px;
  }
  .footer-col {
    text-align: left;
  }

  /* 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: hidden;
  }
}

/* Scroll lock for mobile menu */
body.no-scroll {
  overflow: 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;
}