:root {
  --primary-color: #017439;
  --secondary-color: #FFFFFF;
  --header-top-bg: #004d26; /* Darker green */
  --main-nav-bg: #017439; /* Primary green */
  --footer-bg: #004d26; /* Darker green */
  --btn-register-bg: #C30808;
  --btn-login-bg: #C30808;
  --btn-text-color: #FFFF00;
  --text-on-dark: #FFFFFF;
  --text-on-light: #333333;

  /* Header offset based on desktop: header-top (68px) + main-nav (52px) = 120px + 2px buffer */
  --header-offset: 122px;
}

body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding-top: var(--header-offset); /* Crucial for fixed header */
  overflow-x: hidden; /* Prevent horizontal scroll */
  color: var(--text-on-light);
}

body.no-scroll {
  overflow: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

/* --- Site Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  background-color: var(--header-top-bg); /* Fallback */
  box-sizing: border-box;
}

.header-top {
  background-color: var(--header-top-bg);
  min-height: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  overflow: hidden;
  width: 100%;
  box-sizing: border-box;
}

.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 {
  font-size: 28px;
  font-weight: bold;
  color: var(--text-on-dark);
  text-transform: uppercase;
  display: block; /* Ensure it's visible */
}

.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 for desktop */
  min-height: 48px; /* Placeholder height */
  background-color: var(--header-top-bg); /* Same as header-top */
  padding: 0 20px;
}

.btn {
  padding: 10px 18px;
  border-radius: 5px;
  font-weight: bold;
  text-align: center;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
  text-decoration: none; /* Remove underline */
}

.btn-login {
  background-color: var(--btn-login-bg);
  color: var(--btn-text-color);
}

.btn-register {
  background-color: var(--btn-register-bg);
  color: var(--btn-text-color);
}

.btn:hover {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.main-nav {
  background-color: var(--main-nav-bg);
  min-height: 52px;
  height: 52px;
  display: flex; /* Default desktop display */
  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; /* Desktop horizontal */
  justify-content: center;
  align-items: center;
  padding: 0 20px;
  gap: 25px;
}

.main-nav .nav-link {
  color: var(--text-on-dark);
  font-weight: bold;
  padding: 5px 0;
  transition: color 0.3s ease;
  white-space: nowrap;
}

.main-nav .nav-link:hover {
  color: #FFD700; /* Gold hover effect */
}

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

.hamburger-menu span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: var(--text-on-dark);
  position: absolute;
  left: 0;
  transition: all 0.3s ease;
}

.hamburger-menu span:nth-child(1) { top: 0; }
.hamburger-menu span:nth-child(2) { top: 10px; }
.hamburger-menu span:nth-child(3) { top: 20px; }

.hamburger-menu.active span:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}
.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
}
.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-10px) rotate(-45deg);
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 998; /* Below hamburger, above main content */
  display: none; /* Hidden by default */
  opacity: 0;
  transition: opacity 0.3s ease;
}

.overlay.active {
  display: block;
  opacity: 1;
}

/* --- Site Footer --- */
.site-footer {
  background-color: var(--footer-bg);
  color: var(--text-on-dark);
  padding: 40px 20px 20px;
  font-size: 14px;
  box-sizing: border-box;
  width: 100%;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 30px;
}

.footer-col h3 {
  color: var(--text-on-dark);
  font-size: 18px;
  margin-bottom: 15px;
}

.footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--text-on-dark);
  text-transform: uppercase;
  margin-bottom: 15px;
  display: block;
}

.footer-description {
  line-height: 1.6;
  margin-bottom: 15px;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

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

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

.footer-nav a {
  color: var(--text-on-dark);
  transition: color 0.3s ease;
}

.footer-nav a:hover {
  color: #FFD700;
}

.footer-bottom {
  text-align: center;
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 20px;
}

.footer-bottom p {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
}

.footer-slot-anchor-inner {
  /* This container must remain visible and not hidden by CSS */
  /* Content will be injected into this by the system */
}

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

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

  .site-header {
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2); /* Ensure shadow is visible on mobile */
  }

  .header-top {
    min-height: 60px;
    height: 60px;
    padding: 0 15px;
    position: relative; /* For absolute positioning of logo */
  }

  .header-container {
    padding: 0;
    justify-content: space-between;
    position: static;
    height: 100%; /* Ensure container takes full height for vertical alignment */
  }

  .logo {
    position: absolute !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    top: 50%; /* Vertically center */
    transform: translate(-50%, -50%) !important; /* Combine transforms */
    max-width: calc(100% - 100px); /* Account for hamburger width (40px) + some buffer */
    white-space: nowrap; /* Prevent text logo from wrapping if it's long */
    overflow: hidden; /* Hide overflow if text is too long */
    text-overflow: ellipsis; /* Add ellipsis */
    display: flex !important; /* For vertical centering if logo contains image or text */
    align-items: center !important;
    justify-content: center !important;
    height: 100%; /* Take full height for vertical centering */
    color: var(--text-on-dark); /* Ensure text color is set */
    font-size: 24px; /* Adjust font size for mobile */
  }
  
  .logo img {
    max-height: 56px !important;
    max-width: 100%;
    height: auto;
    object-fit: contain;
  }

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

  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons */
    min-height: 48px;
    height: 48px; /* Fixed height for mobile button bar */
    align-items: center;
    justify-content: center; /* Center buttons horizontally */
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 0 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: var(--header-top-bg); /* Same as header-top */
  }

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

  .hamburger-menu {
    display: flex; /* Show hamburger menu on mobile */
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    position: relative; /* Keep it in flow, or absolute to the left */
    height: 100%;
    width: 40px;
    z-index: 2; /* Above logo for interaction */
  }
  
  .hamburger-menu span {
    width: 25px;
    right: auto; /* Reset right */
    left: 0; /* Align spans to the left */
  }

  .main-nav {
    display: none; /* Hidden by default on mobile */
    position: fixed;
    top: var(--header-offset); /* Position below fixed header and mobile buttons */
    left: 0;
    width: 70%; /* Side menu width */
    max-width: 300px; /* Max width for larger phones/tablets */
    height: calc(100% - var(--header-offset)); /* Fill remaining viewport height */
    background-color: var(--main-nav-bg);
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 20px 0;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.3);
    transform: translateX(-100%); /* Slide out of view */
    transition: transform 0.3s ease;
    box-sizing: border-box;
    overflow-y: auto; /* Enable scrolling for long menus */
  }

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

  .main-nav .nav-container {
    flex-direction: column; /* Vertical links */
    align-items: flex-start;
    padding: 0 20px;
    width: 100%;
    max-width: none; /* No max-width on mobile container */
    height: auto;
  }

  .main-nav .nav-link {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-on-dark);
  }
  .main-nav .nav-link:last-child {
      border-bottom: none;
  }

  .overlay {
    z-index: 999; /* Below menu, above body */
  }

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

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

  .footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px 20px; /* Adjust gap for wrapped links */
  }
  .footer-nav li {
    margin-bottom: 0;
  }

  .footer-nav a {
    white-space: nowrap;
  }

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

  .footer-bottom {
    padding-left: 15px;
    padding-right: 15px;
  }

  /* 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;
  }
}
/* 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;
  }
}