.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: #113B7A; box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4); min-height: auto; font-family: 'Arial', sans-serif; }
.header-top { background: #0A1F40; width: 100%; min-height: 68px; display: flex; align-items: center; border-bottom: 1px solid #1B3357; }
.header-container { max-width: 1200px; width: 100%; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 0 20px; gap: 20px; }
.logo { display: inline-block; font-size: 28px; font-weight: 800; color: #F2C14E; text-decoration: none; letter-spacing: 1px; text-shadow: 0 2px 4px rgba(0,0,0,0.3); white-space: nowrap; }
.desktop-nav-buttons { display: flex; align-items: center; gap: 10px; }
.btn { display: inline-block; padding: 10px 20px; border-radius: 6px; font-size: 14px; font-weight: 700; text-decoration: none; transition: transform 0.3s ease, box-shadow 0.3s ease; text-align: center; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.3); }
.btn:active { transform: translateY(0); }
.btn-register { background: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%); color: #F3F8FF; border: 1px solid #244D84; }
.btn-download { background: linear-gradient(180deg, #F2C14E 0%, #D19E2E 100%); color: #08162B; border: 1px solid #F2C14E; }
.btn-login { background: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%); color: #F3F8FF; border: 1px solid #244D84; display: none; }
.main-nav { background: #1D5FD1; width: 100%; min-height: 52px; display: flex; align-items: center; }
.nav-container { max-width: 1200px; width: 100%; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; padding: 10px 20px; gap: 8px; }
.nav-list { list-style: none; display: flex; flex-direction: row; justify-content: center; align-items: center; gap: 4px; margin: 0; padding: 0; }
.nav-list li a { color: #F3F8FF; text-decoration: none; font-weight: 600; font-size: 14px; padding: 10px 14px; border-radius: 4px; transition: color 0.3s ease, background-color 0.3s ease; white-space: nowrap; }
.nav-list li a:hover, .nav-list li a.active { color: #F2C14E; background: rgba(0,0,0,0.2); }
.mobile-nav-header { display: none; }
.hamburger-menu { display: none; }
.mobile-menu-overlay { display: none; }
body { padding-top: 122px; }
:root { --header-offset: 122px; }
@media (max-width: 768px) {
  :root { --header-offset: 146px; }
  body { padding-top: var(--header-offset); }
  .header-container { width: 100%; max-width: none; padding: 0 15px; gap: 10px; min-height: 60px; }
  .nav-container { width: 100%; max-width: none; padding: 0; }
  .logo { font-size: 16px; flex: 1; text-align: center; }
  .desktop-nav-buttons { display: none; }
  .btn-login { display: inline-block; padding: 8px 14px; font-size: 13px; }
  .mobile-nav-header { display: flex; flex-direction: row; justify-content: space-between; align-items: center; padding: 12px 15px; gap: 10px; background: #0A1F40; }
  .mobile-nav-logo { color: #F2C14E; font-size: 22px; font-weight: 800; text-decoration: none; }
  .hamburger-menu { display: flex; flex-direction: column; justify-content: center; align-items: center; width: 40px; height: 40px; background: transparent; border: 1px solid #244D84; border-radius: 6px; cursor: pointer; padding: 8px; z-index: 1002; position: relative; }
  .hamburger-menu span { display: block; width: 22px; height: 2px; background: #F3F8FF; margin: 3px 0; transition: transform 0.3s ease, opacity 0.3s ease; }
  .hamburger-menu.active { border-color: #F2C14E; }
  .hamburger-menu.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
  .hamburger-menu.active span:nth-child(2) { opacity: 0; }
  .hamburger-menu.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
  .main-nav { background: #1D5FD1; min-height: 0; display: none; flex-direction: column; position: fixed; top: 0; left: 0; width: 85%; max-width: 300px; height: 100%; z-index: 1001; transform: translateX(-100%); transition: transform 0.3s ease, display 0s 0.3s; box-shadow: 4px 0 15px rgba(0,0,0,0.3); border-radius: 0 8px 8px 0; overflow-y: auto; }
  .main-nav.active { display: flex; transform: translateX(0); transition: transform 0.3s ease; }
  .nav-list { flex-direction: column; align-items: flex-start; gap: 0; padding: 10px 15px 20px; width: 100%; }
  .nav-list li { width: 100%; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .nav-list li:last-child { border-bottom: none; }
  .nav-list li a { display: block; padding: 14px 15px; color: #F3F8FF; font-size: 15px; font-weight: 500; width: 100%; }
  .mobile-menu-overlay { display: block; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 999; opacity: 0; visibility: hidden; transition: opacity 0.3s ease; }
  .mobile-menu-overlay.active { opacity: 1; visibility: visible; }
  body.no-scroll { overflow: 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-footer { background: #08162B; color: #AFC4E8; font-family: 'Arial', sans-serif; margin-top: 40px; }
.footer-container { max-width: 1200px; margin: 0 auto; padding: 50px 20px 20px; }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; margin-bottom: 40px; }
.footer-col h4 { color: #F2C14E; font-size: 16px; font-weight: 700; margin-bottom: 15px; text-transform: uppercase; }
.footer-col p { font-size: 14px; line-height: 1.6; margin-bottom: 12px; }
.footer-logo { display: inline-block; font-size: 26px; font-weight: 800; color: #F2C14E; text-decoration: none; margin-bottom: 15px; }
.footer-nav { list-style: none; padding: 0; margin: 0; }
.footer-nav li { margin-bottom: 10px; }
.footer-nav li a { color: #AFC4E8; text-decoration: none; font-size: 14px; transition: color 0.3s ease; }
.footer-nav li a:hover { color: #4FA8FF; }
.footer-contact a { color: #4FA8FF; text-decoration: none; }
.footer-bottom { border-top: 1px solid #1B3357; padding-top: 20px; text-align: center; font-size: 14px; display: flex; flex-direction: column; gap: 8px; }
.footer-bottom p { margin: 0; }
.footer-note { color: #AFC4E8; font-size: 13px; }
@media (max-width: 768px) {
  .footer-container { padding: 30px 15px 15px; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .footer-col { text-align: center; }
  .footer-nav li { margin-bottom: 8px; }
  .footer-bottom { font-size: 13px; }
}
/* 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;
}