:root {
  --primary-color: #26A9E0; /* Light blue */
  --secondary-color: #FFFFFF; /* White */
  --login-button-color: #EA7C07; /* Orange */
  --header-top-bg: #1A8EC7; /* Darker blue for header top */
  --main-nav-bg: #26A9E0; /* Primary blue for main nav */
  --footer-bg: #1A2F4A; /* Dark professional blue for footer */
  --text-color-dark: #333333;
  --text-color-light: #FFFFFF;
  --header-offset: 122px; /* 68px (header-top) + 52px (main-nav) + 2px buffer */
}

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

.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(--secondary-color); /* Fallback, specific colors for sections */
  box-sizing: border-box;
}

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

.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--secondary-color);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex; /* For potential image logo alignment */
  align-items: center;
  height: 100%; /* Align with header-top height */
}

.logo img {
  display: block;
  max-height: 60px; /* Matches header-top height */
  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; /* Fixed height for mobile button bar */
  width: 100%;
  background-color: var(--header-top-bg); /* Same as header-top for consistency */
  justify-content: center; /* Center buttons horizontally */
  align-items: center;
  padding: 0 15px; /* Mobile specific padding */
}

.main-nav {
  box-sizing: border-box;
  min-height: 52px;
  height: 52px;
  display: flex; /* Desktop default: flex */
  align-items: center;
  overflow: hidden;
  background-color: var(--main-nav-bg);
  width: 100%;
  transition: transform 0.3s ease-in-out; /* For mobile menu animation */
}

.nav-container {
  box-sizing: border-box;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: row; /* Desktop default: row */
  justify-content: center;
  align-items: center;
  padding: 0 20px;
  width: 100%;
}

.nav-link {
  color: var(--secondary-color);
  text-decoration: none;
  padding: 10px 15px;
  font-size: 16px;
  font-weight: bold;
  white-space: nowrap;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

/* Buttons styling */
.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  text-align: center;
  transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
  white-space: nowrap;
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

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

.btn-register {
  background-color: var(--primary-color);
  color: var(--secondary-color);
}

/* Hamburger menu for mobile */
.hamburger-menu {
  display: none; /* Hidden on desktop */
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 25px;
  cursor: pointer;
  padding: 5px;
  z-index: 1001; /* Above header */
}

.hamburger-menu .bar {
  width: 100%;
  height: 3px;
  background-color: var(--secondary-color);
  transition: all 0.3s ease;
  border-radius: 2px;
}

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

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

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

/* Overlay for 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; /* Below menu, above content */
  transition: opacity 0.3s ease;
  opacity: 0;
}

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

/* Footer styling */
.site-footer {
  background-color: var(--footer-bg);
  color: var(--text-color-light);
  padding: 40px 20px 20px;
  font-size: 14px;
  box-sizing: border-box;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

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

.footer-col h3 {
  color: var(--primary-color);
  font-size: 18px;
  margin-bottom: 15px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 8px;
}

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

.footer-description {
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.8);
  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: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s ease;
  display: block; /* Ensure entire area is clickable */
}

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

.footer-mid-area {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 20px;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom p {
  margin: 0;
}

/* Dynamic slot anchors - ensure they are visible for content injection */
.footer-slot-anchor-inner {
  min-height: 1px; /* Ensure element exists and takes minimal space */
  display: block;
}

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

  body {
    padding-top: var(--header-offset);
    overflow-x: hidden;
  }
  .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); /* Ensure shadow is visible on mobile too */
  }

  .header-top {
    min-height: 60px;
    height: 60px;
    padding: 0 15px; /* Adjust padding for mobile */
  }

  .header-container {
    padding: 0; /* Hamburger and logo will manage spacing */
    max-width: none; /* Mobile container fills width */
    position: relative; /* For absolute logo centering */
  }

  .hamburger-menu {
    display: flex; /* Show hamburger on mobile */
    position: relative; /* Ensure it's above other elements */
    left: 0; /* Align to left of header-top */
    margin-right: auto; /* Push logo to center */
  }

  .logo {
    flex: 1 !important; /* Allow logo to take available space */
    display: flex !important;
    justify-content: center !important; /* Center logo text/image */
    align-items: center !important;
    position: absolute; /* Absolute positioning for logo */
    left: 50%;
    transform: translateX(-50%);
    max-width: calc(100% - 100px); /* Account for hamburger and potential right-side elements */
    height: 100%;
  }

  .logo img {
    max-height: 56px !important; /* Matches mobile header-top height */
  }

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

  .mobile-nav-buttons {
    display: flex !important; /* Show mobile buttons */
    justify-content: space-around; /* Distribute buttons */
    gap: 10px;
    flex-wrap: nowrap; /* Prevent buttons from wrapping */
    min-height: 48px;
    height: auto; /* Allow content to dictate height, min-height handles empty */
    padding: 8px 15px; /* Adjust padding for mobile buttons */
    background-color: var(--header-top-bg); /* Match header top */
  }

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

  .main-nav {
    display: none; /* Hidden by default on mobile */
    flex-direction: column; /* Vertical menu */
    position: fixed;
    top: var(--header-offset); /* Below header-top and mobile-nav-buttons */
    left: 0;
    width: 80%; /* Menu width */
    max-width: 300px; /* Max width for menu */
    height: calc(100% - var(--header-offset)); /* Fill remaining height */
    background-color: var(--main-nav-bg);
    overflow-y: auto;
    transform: translateX(-100%); /* Off-screen initially */
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    padding: 20px 0;
  }

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

  .nav-container {
    flex-direction: column; /* Vertical links */
    padding: 0; /* Remove horizontal padding */
    align-items: flex-start; /* Align links to left */
    width: 100%;
    max-width: none; /* Mobile container fills width */
  }

  .nav-link {
    width: 100%;
    padding: 12px 20px; /* Adjust padding for vertical links */
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  .overlay.active {
    top: 0; /* Overlay covers entire screen */
    height: 100vh;
  }

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

  .footer-col {
    margin-bottom: 20px; /* Space between columns */
  }

  .footer-col:last-child {
    margin-bottom: 0;
  }

  .footer-col h3 {
    text-align: center; /* Center footer headings */
  }

  .footer-nav {
    text-align: center; /* Center footer nav links */
  }

  .footer-nav li {
    margin-bottom: 5px;
  }

  .footer-nav a {
    padding: 5px 0;
  }

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

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

  .footer-description {
    padding: 0 10px; /* Add some padding to description */
  }
}
/* 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;
  }
}