html { scroll-behavior: smooth; }
:root { --header-offset: 122px; }
body { font-family: 'Arial', sans-serif; margin: 0; padding-top: var(--header-offset); color: #1F2D3D; background-color: #F4F7FB; overflow-x: hidden; }

.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; /* Actual background colors are on header-top and main-nav */ }

.header-top { box-sizing: border-box; height: 68px; display: flex; align-items: center; overflow: hidden; background-color: #2F6BFF; width: 100%; }
.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; }

.logo { font-size: 28px; font-weight: bold; color: #FFFFFF; text-decoration: none; display: block; line-height: 1; }
.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; }
.btn { text-decoration: none; padding: 10px 20px; border-radius: 5px; font-weight: bold; white-space: nowrap; background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); color: #FFFFFF; transition: background 0.3s ease; border: none; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; line-height: 1.2; }
.btn:hover { opacity: 0.9; }

.mobile-nav-buttons { box-sizing: border-box; display: none; min-height: 48px; background-color: #F4F7FB; width: 100%; border-bottom: 1px solid #D6E2FF; /* Added for visual separation */ }

.main-nav { box-sizing: border-box; height: 52px; display: flex; align-items: center; overflow: hidden; background-color: #6FA3FF; width: 100%; }
.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; }
.nav-link { color: #FFFFFF; text-decoration: none; padding: 0 15px; font-weight: 500; font-size: 16px; transition: color 0.3s ease; height: 100%; display: flex; align-items: center; white-space: nowrap; }
.nav-link:hover { color: rgba(255, 255, 255, 0.8); }

.hamburger-menu { display: none; flex-direction: column; justify-content: space-around; width: 30px; height: 25px; cursor: pointer; background: transparent; border: none; padding: 0; position: relative; z-index: 1002; /* Higher than main-nav for mobile */ }
.hamburger-icon { display: block; width: 100%; height: 3px; background-color: #FFFFFF; border-radius: 3px; transition: all 0.3s ease; position: absolute; left: 0; top: 50%; transform: translateY(-50%); }
.hamburger-icon::before, .hamburger-icon::after { content: ''; display: block; width: 100%; height: 3px; background-color: #FFFFFF; border-radius: 3px; position: absolute; left: 0; transition: all 0.3s ease; }
.hamburger-icon::before { top: -8px; }
.hamburger-icon::after { top: 8px; }

.hamburger-menu.active .hamburger-icon { background-color: transparent; }
.hamburger-menu.active .hamburger-icon::before { top: 0; transform: rotate(45deg); }
.hamburger-menu.active .hamburger-icon::after { top: 0; transform: rotate(-45deg); }

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

/* Footer styles */
.site-footer { background-color: #2F6BFF; color: #FFFFFF; padding: 40px 0 20px; font-size: 15px; }
.footer-top-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 1200px; margin: 0 auto; padding: 0 20px 30px; border-bottom: 1px solid rgba(255, 255, 255, 0.2); }
.footer-col { display: flex; flex-direction: column; }
.footer-logo { font-size: 24px; font-weight: bold; color: #FFFFFF; text-decoration: none; margin-bottom: 15px; display: block; }
.footer-description { margin-bottom: 15px; line-height: 1.6; color: rgba(255, 255, 255, 0.8); word-wrap: break-word; overflow-wrap: break-word; }
.footer-col h3 { font-size: 18px; margin-bottom: 15px; color: #FFFFFF; }
.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; }
.footer-nav a:hover { color: #FFFFFF; }
.footer-bottom { max-width: 1200px; margin: 20px auto 0; padding: 0 20px; text-align: center; color: rgba(255, 255, 255, 0.6); }
.footer-bottom p { margin: 0; }
.footer-slot-anchor-inner { min-height: 1px; }

@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  .header-top { height: 60px; }
  .header-container { padding: 0 15px; max-width: none; }
  .logo { font-size: 24px; flex: 1 !important; display: flex !important; justify-content: center !important; align-items: center !important; }
  .logo img { max-height: 56px !important; }
  .hamburger-menu { display: flex; margin-left: -10px; /* Adjust for visual alignment */ }
  .desktop-nav-buttons { display: none !important; }
  .mobile-nav-buttons {
    display: flex !important;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    width: 100%; max-width: 100%;
    box-sizing: border-box;
    padding: 0 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    background-color: #F4F7FB;
  }
  .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 {
    height: 100vh; /* Full viewport height for mobile menu */
    display: none; /* Hidden by default */
    position: fixed; top: var(--header-offset); left: 0; width: 80%; max-width: 300px; /* Max width for menu sidebar */
    flex-direction: column; justify-content: flex-start; align-items: flex-start;
    background-color: #2F6BFF;
    transform: translateX(-100%); /* Start off-screen */
    transition: transform 0.3s ease;
    padding-top: 20px;
    box-shadow: 2px 0 5px rgba(0,0,0,0.2);
    z-index: 1001;
  }
  .main-nav.active { display: flex; transform: translateX(0); }
  .nav-container { flex-direction: column; align-items: flex-start; padding: 0 15px; width: 100%; max-width: none; }
  .nav-link { width: 100%; padding: 10px 0; font-size: 18px; justify-content: flex-start; }
  .overlay.active { display: block; }
  body.no-scroll { overflow: hidden; }

  .footer-top-grid { grid-template-columns: 1fr; padding: 0 15px 30px; }
  .footer-col { margin-bottom: 20px; }
  .footer-bottom { padding: 0 15px; }

  .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;
  }
}