:root {
  --primary-color: #1A202C;
  --secondary-color: #FFD700;
  --text-light: #FFFFFF;
  --text-dark: #1A202C;
  --header-offset: 110px; /* Desktop: header-top (60px) + main-nav (50px) */
}

@media (max-width: 768px) {
  :root {
    --header-offset: 110px; /* Mobile: header-top (60px) + mobile-nav-buttons (50px) */
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  padding-top: var(--header-offset);
  overflow-x: hidden; /* Prevent horizontal scroll on body */
}

/* --- Header Styles --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.header-top {
  background-color: var(--primary-color); /* Dark blue-gray */
  color: var(--text-light);
  padding: 10px 0;
  min-height: 60px; /* Ensure minimum height for logo/hamburger */
  display: flex;
  align-items: center;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--secondary-color); /* Gold */
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 5px 0;
  display: block; /* Ensure visibility */
}

.desktop-nav-buttons {
  display: flex;
  gap: 10px;
}

.btn {
  background-color: var(--secondary-color); /* Gold */
  color: var(--primary-color); /* Dark blue-gray */
  padding: 8px 15px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: background-color 0.3s ease, color 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 15px;
  display: inline-block;
  text-align: center;
}

.btn:hover {
  background-color: #e6c200; /* Slightly darker gold */
}

.main-nav {
  background-color: var(--secondary-color); /* Gold */
  padding: 10px 0;
  min-height: 50px;
  display: flex;
  align-items: center;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0 20px;
  flex-wrap: wrap;
}

.nav-link {
  color: var(--primary-color); /* Dark blue-gray */
  text-decoration: none;
  padding: 10px 15px;
  font-weight: bold;
  transition: color 0.3s ease, background-color 0.3s ease;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  background-color: rgba(26, 32, 44, 0.1); /* Slight hover effect */
  border-radius: 3px;
}

.hamburger-menu {
  display: none; /* Hidden on desktop */
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  position: relative;
  z-index: 1001;
  width: 30px;
  height: 30px;
  order: 0; /* Ensures it's on the left */
}

.hamburger-menu::before, .hamburger-menu::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--secondary-color); /* Gold */
  transition: transform 0.3s ease, top 0.3s ease;
}

.hamburger-menu::before {
  top: 5px;
}

.hamburger-menu::after {
  top: 18px;
}

.hamburger-menu.active::before {
  transform: rotate(45deg);
  top: 13px;
}

.hamburger-menu.active::after {
  transform: rotate(-45deg);
  top: 13px;
}

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

.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;
}

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

/* --- Footer Styles --- */
.site-footer {
  background-color: var(--primary-color); /* Dark blue-gray */
  color: var(--text-light);
  padding: 40px 20px 20px;
  font-size: 14px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 30px;
}

.footer-section {
  flex: 1;
  min-width: 200px;
}

.footer-logo {
  font-size: 24px;
  font-weight: bold;
  color: var(--secondary-color); /* Gold */
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 15px;
  display: inline-block;
}

.site-footer h3 {
  color: var(--secondary-color); /* Gold */
  margin-bottom: 15px;
  font-size: 18px;
}

.site-footer p {
  margin-bottom: 10px;
}

.site-footer ul {
  list-style: none;
}

.site-footer ul li a {
  color: var(--text-light);
  text-decoration: none;
  display: block;
  padding: 5px 0;
  transition: color 0.3s ease;
}

.site-footer ul li a:hover {
  color: var(--secondary-color); /* Gold */
}

.footer-bottom {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

/* --- Mobile Specific Styles --- */
@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;
  }

  .site-header {
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  }

  .header-container {
    padding: 0 15px;
    position: relative;
    min-height: 60px; /* Ensure space for hamburger and logo */
  }

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

  .logo {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    font-size: 24px;
    padding: 0;
    display: flex !important; /* For centering */
    align-items: center !important;
    justify-content: center !important;
    max-width: calc(100% - 100px); /* Leave space for hamburger */
  }

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

  .mobile-nav-buttons {
    display: flex !important;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 10px 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: var(--primary-color); /* Match header-top */
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    justify-content: center;
  }

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

  .main-nav {
    display: none; /* Hidden by default on mobile */
    flex-direction: column;
    position: fixed;
    left: 0;
    top: var(--header-offset); /* Position below header and mobile buttons */
    width: 80%;
    max-width: 300px; /* Max width for side menu */
    height: calc(100vh - var(--header-offset));
    background-color: var(--primary-color); /* Dark blue-gray */
    transform: translateX(-100%); /* Slide out of view */
    transition: transform 0.3s ease;
    overflow-y: auto;
    padding: 20px 0;
  }

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

  .nav-container {
    flex-direction: column;
    align-items: flex-start;
    padding: 0 15px;
    width: 100%;
    max-width: none; /* Remove max-width on mobile */
  }

  .nav-link {
    width: 100%;
    padding: 12px 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-light); /* Light text for dark background */
  }

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

  .nav-link:hover, .nav-link.active {
    background-color: rgba(255, 255, 255, 0.1);
  }

  .footer-container {
    flex-direction: column;
    gap: 20px;
  }

  .footer-section {
    min-width: auto;
  }
}
/* 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;
  }
}