:root { --header-offset: 122px; }
body { padding-top: var(--header-offset); }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: #FFFFFF; box-shadow: 0 4px 6px rgba(0,0,0,0.1); min-height: auto; }
.header-top { background: linear-gradient(135deg, #0e5a77 0%, #1a8bbf 50%, #26A9E0 100%); width: 100%; }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 12px 30px; }
.logo { font-size: 32px; font-weight: 900; color: #FFFFFF; text-decoration: none; letter-spacing: -1px; text-transform: uppercase; display: block; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
.desktop-nav-buttons { display: flex; align-items: center; gap: 12px; }
.main-nav { background: #FFFFFF; width: 100%; display: flex; border-top: 2px solid #26A9E0; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; padding: 8px 20px; gap: 0; }
.nav-item { padding: 10px 18px; color: #0d3b4f; text-decoration: none; font-size: 16px; font-weight: 700; border-radius: 4px; transition: all 0.3s ease; white-space: nowrap; text-align: center; }
.nav-item:hover, .nav-item:focus { background: #26A9E0; color: #FFFFFF; }
.btn { display: inline-block; padding: 10px 24px; border-radius: 30px; text-align: center; font-size: 14px; font-weight: 700; text-decoration: none; transition: all 0.3s ease; border: none; cursor: pointer; }
.btn-login { background: #EA7C07; color: #FFFFFF; box-shadow: 0 4px 12px rgba(234, 124, 7, 0.4); }
.btn-register { background: #FFFFFF; color: #0d5b8a; border: 2px solid #0d5b8a; }
.hamburger-menu { display: none; position: absolute; top: 12px; left: 15px; background: none; border: none; cursor: pointer; width: 40px; height: 40px; z-index: 1001; }
.hamburger-menu .bar { display: block; width: 25px; height: 3px; margin: 6px auto; background-color: #333333; transition: all 0.4s ease-in-out; }
.mobile-menu-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 1000; }
.mobile-nav-buttons { display: none; }
@media (max-width: 768px) { :root { --header-offset: 110px; }
  .page-content img { max-width: 100% !important; height: auto !important; display: block; }
  .page-content { overflow-x: hidden; max-width: 100%; }
  body { overflow-x: hidden; }
  .header-container { width: 100%; max-width: none; padding: 10px 50px; }
  .nav-container { width: 100%; max-width: none; padding: 20px; }
  .site-header { background: #FFFFFF; }
  .header-top { background: linear-gradient(135deg, #0e5a77 0%, #1a8bbf 50%, #26A9E0 100%); }
  .logo { font-size: 26px; margin: 0 auto; }
  .desktop-nav-buttons { display: none; }
  .hamburger-menu { display: flex; flex-direction: column; justify-content: center; align-items: flex-start; }
  .hamburger-menu.active .bar:nth-child(1) { transform: translateY(10px) rotate(45deg); background: #FFFFFF; }
  .hamburger-menu.active .bar:nth-child(2) { opacity: 0; }
  .hamburger-menu.active .bar:nth-child(3) { transform: translateY(-10px) rotate(-45deg); background: #FFFFFF; }
  .mobile-nav-buttons { display: flex; justify-content: center; align-items: center; gap: 15px; background: #FFFFFF; margin: 0; padding: 8px 10px; border-top: 2px solid #EA7C07; flex-wrap: wrap; }
  .mobile-nav-buttons .btn { flex: 1; max-width: 200px; padding: 8px 10px; }
  .main-nav { display: none; position: fixed; top: 0; left: 0; height: 100vh; width: 280px; max-width: 85vw; flex-direction: column; background: #FFFFFF; box-shadow: 2px 0 10px rgba(0,0,0,0.2); transform: translateX(-100%); transition: transform 0.3s ease; border-top: none; border-right: 2px solid #26A9E0; z-index: 1002; }
  .main-nav.active { display: flex; transform: translateX(0) !important; }
  .nav-container { flex-direction: column; align-items: flex-start; padding: 60px 16px 20px; gap: 4px; max-width: none; width: 100%; }
  .nav-item { width: 100%; font-size: 16px; padding: 12px; color: #0d3b4f !important; text-align: left; border-bottom: 1px solid #f0f0f0; }
  .nav-item:hover, .nav-item:focus { background: #26A9E0; color: #FFFFFF !important; }
  .mobile-menu-overlay { display: none; opacity: 0; transition: opacity 0.3s ease; }
  .mobile-menu-overlay.visible { display: block; opacity: 1; }
  body.no-scroll { overflow: hidden; }
  .logo { display: block; } }
.site-footer { background: #0e3a4d; color: #FFFFFF; margin-top: auto; }
.footer-container { max-width: 1200px; margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 30px; padding: 50px 20px 30px; }
.footer-column { flex: 1 1 250px; max-width: 350px; }
.footer-title { font-size: 28px; font-weight: 900; color: #26A9E0; margin-bottom: 15px; }
.footer-description { font-size: 14px; color: #CCCCCC; line-height: 1.6; }
.footer-heading { font-size: 16px; font-weight: 700; color: #FFFFFF; margin-bottom: 15px; text-transform: uppercase; }
.footer-nav { display: flex; flex-direction: column; gap: 8px; }
.footer-nav a { color: #CCCCCC; text-decoration: none; font-size: 14px; transition: color 0.3s ease; padding: 4px 0; }
.footer-nav a:hover { color: #26A9E0; }
.copyright-bar { background: #092b3a; padding: 15px 20px; text-align: center; }
.copyright-bar p { color: #AAAAAA; font-size: 13px; margin: 0; }
/* 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;
}