:root {
  --primary-color: #26A9E0;
  --accent-color: #FFFFFF;
  --login-button-color: #EA7C07;
  --background-color: #FFFFFF;
  --text-color-dark: #000000;
  --header-offset: 122px; /* Desktop: 68px (header-top) + 52px (main-nav) */
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  padding-top: var(--header-offset);
  overflow-x: hidden; /* Global overflow-x to prevent horizontal scroll */
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  box-sizing: border-box;
}

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

.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;
}

.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--accent-color);
  text-decoration: none;
  padding: 0;
  display: block;
}

.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: #f0f0f0; /* A neutral background for mobile buttons */
  width: 100%;
  padding: 0 15px; /* Mobile button padding */
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  color: var(--accent-color);
  background-color: var(--login-button-color); /* Specific color for login/register */
  transition: background-color 0.3s ease;
  white-space: nowrap; /* Prevent wrapping on desktop */
  border: none;
  cursor: pointer;
  text-align: center;
}

.btn:hover {
  filter: brightness(1.1);
}

.btn-register {
  background-color: #31a7ff; /* A different vibrant color for register */
}

.hamburger-menu {
  display: none; /* Hidden on desktop */
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  position: absolute; /* Positioned relative to header-top for mobile */
  left: 15px; /* Align to left on mobile */
  z-index: 1001; /* Above logo */
}

.hamburger-menu span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--accent-color);
  margin-bottom: 5px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.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);
}

.main-nav {
  background-color: #1a7eb3; /* Different background for main nav (darker primary) */
  min-height: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  overflow: hidden;
  width: 100%;
  box-sizing: border-box;
}

.main-nav .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;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 25px;
}

.main-nav ul li a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: bold;
  padding: 10px 0;
  display: block;
  transition: color 0.3s ease;
}

.main-nav ul li a:hover {
  color: #d0e8f8;
}

/* Footer Styles */
.site-footer {
  background-color: #222;
  color: #bbb;
  padding: 40px 20px 20px;
  font-size: 14px;
  box-sizing: border-box;
}

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

.footer-col h3 {
  color: var(--accent-color);
  margin-top: 0;
  margin-bottom: 15px;
  font-size: 16px;
}

.footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--accent-color);
  text-decoration: none;
  margin-bottom: 15px;
  display: block;
}

.footer-description {
  margin-bottom: 15px;
  line-height: 1.8;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

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

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

.footer-nav li a {
  color: #bbb;
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid #444;
  color: #888;
}

.footer-bottom p {
  margin: 0;
}

.footer-slot-anchor-inner {
  min-height: 1px;
}

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

  body {
    padding-top: var(--header-offset);
  }

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

  .header-container {
    width: 100%;
    max-width: none; /* No max-width on mobile */
    padding: 0; /* Remove padding from container as header-top has it */
    position: static; /* Reset to static for flexible layout */
  }

  .logo {
    flex: 1 !important; /* Method 1 for image logo centering */
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    padding: 0;
    font-size: 24px;
  }

  .logo img {
    max-height: 56px !important; /* Match mobile header-top height */
    max-width: 100%;
  }

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

  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons */
    min-height: 48px;
    height: auto; /* Allow height to adjust if text wraps */
    align-items: center;
    width: 100%; max-width: 100%;
    box-sizing: border-box;
    padding: 8px 15px; /* Adjusted padding for mobile buttons */
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap; /* Prevent wrapping */
    background-color: #f0f0f0; /* Ensure background is visible */
    box-shadow: 0 1px 3px rgba(0,0,0,0.05); /* Subtle shadow below buttons */
  }

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

  .hamburger-menu {
    display: block; /* Show hamburger menu */
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 15px;
    z-index: 1002;
  }

  /* Main Nav for Mobile (Hamburger menu content) */
  .main-nav {
    display: none; /* Hidden by default */
    position: fixed;
    top: var(--header-offset); /* Below the fixed header */
    left: 0;
    width: 280px; /* Sidebar width */
    height: calc(100% - var(--header-offset));
    background-color: #1a7eb3; /* Same as desktop main nav */
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2);
    transform: translateX(-100%); /* Slide out of view */
    transition: transform 0.3s ease;
    overflow-y: auto; /* Enable scrolling for long menus */
    box-sizing: border-box;
    z-index: 999; /* Below hamburger, above content */
  }

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

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

  .main-nav ul {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }

  .main-nav ul li {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .main-nav ul li:last-child {
    border-bottom: none;
  }

  .main-nav ul li a {
    padding: 12px 0;
  }

  /* 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: 998; /* Below menu, above content */
  }

  .overlay.active {
    display: block;
  }

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

  .footer-col {
    text-align: center; /* Center footer columns on mobile */
  }

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

  .footer-col:first-child .footer-logo {
    margin-top: 0;
  }

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

  .footer-bottom {
    padding-top: 15px;
  }

  /* Mobile content overflow prevention */
  .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;
}