.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: #F4F7FB; box-shadow: 0 2px 15px rgba(31, 45, 61, 0.15); font-family: 'Nunito', Arial, sans-serif; }
.site-header a { text-decoration: none; }
.marquee-section { background: linear-gradient(90deg, #2F6BFF, #6FA3FF); color: #fff; padding: 8px 0; overflow: hidden; white-space: nowrap; }
.marquee-container { max-width: 1200px; margin: 0 auto; overflow: hidden; }
.marquee-text { display: inline-block; padding-left: 100%; font-size: 13px; font-weight: 700; letter-spacing: 0.5px; animation: marquee-scroll 18s linear infinite; text-shadow: 0 1px 2px rgba(0,0,0,0.2); }
@keyframes marquee-scroll { 0% { transform: translateX(0%); } 100% { transform: translateX(-100%); } }
.header-top { background: #1A3CA8; width: 100%; }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding-left: 25px; padding-right: 25px; min-height: 56px; }
.logo { display: inline-block; color: #FFFFFF; font-size: 32px; font-weight: 900; letter-spacing: 2px; text-transform: lowercase; text-shadow: 2px 2px 4px rgba(0,0,0,0.3); position: relative; }
.logo::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 100%; height: 3px; background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); border-radius: 2px; }
.header-top .logo { color: #fff; }
.desktop-nav-buttons { display: flex; gap: 10px; align-items: center; }
.btn { padding: 9px 22px; border-radius: 25px; font-size: 14px; font-weight: 800; display: inline-block; text-decoration: none; cursor: pointer; transition: all 0.3s ease; color: #fff; border: none; text-transform: none; letter-spacing: 0.3px; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2); }
.btn-download { background: #ffffff; color: #1F2D3D; border: 2px solid #ffffff; }
.btn-login { background: transparent; border: 2px solid #ffffff; color: #ffffff; }
.btn-login:hover { background: rgba(255,255,255,0.1); }
.btn-register { background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); border: 2px solid transparent; box-shadow: 0 0 10px rgba(74, 139, 255, 0.5); }
.btn-register:hover { box-shadow: 0 0 20px rgba(74, 139, 255, 0.8); }
.main-nav { background: #F4F7FB; width: 100%; display: flex; border-bottom: 1px solid #D6E2FF; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; flex-wrap: wrap; padding: 6px 20px; gap: 2px; width: 100%; }
.nav-link { display: inline-block; color: #1F2D3D; font-size: 13px; font-weight: 700; padding: 6px 10px; text-decoration: none; text-transform: none; border-radius: 20px; transition: all 0.2s ease; white-space: nowrap; }
.nav-link:hover, .nav-link.active { background: #2F6BFF; color: #ffffff; }
.hamburger-menu { display: none; background: transparent; border: none; cursor: pointer; }
.mobile-menu-overlay { display: none; }
.mobile-nav-buttons { display: none; }
@media (min-width: 1024px) { .main-nav .nav-container { justify-content: center; } }
:root { --header-offset: 166px; }
body { padding-top: var(--header-offset); margin: 0; font-family: 'Nunito', Arial, sans-serif; background: #F4F7FB; }
.site-footer { background: #1A3CA8; color: #ffffff; font-family: 'Nunito', Arial, sans-serif; }
.site-footer a { text-decoration: none; color: #ffffff; transition: color 0.2s ease; }
.footer-main { padding: 50px 0 30px; border-bottom: 1px solid rgba(214, 226, 255, 0.2); }
.footer-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; padding: 0 20px; }
.footer-brand .footer-logo { font-size: 36px; color: #ffffff; font-weight: 900; margin-bottom: 18px; display: inline-block; text-transform: lowercase; }
.footer-brand .footer-desc { color: rgba(255,255,255,0.85); font-size: 14px; line-height: 1.7; margin-bottom: 15px; }
.footer-brand .footer-license { color: rgba(255,255,255,0.6); font-size: 12px; }
.footer-title { color: #ffffff; font-size: 16px; font-weight: 800; text-transform: uppercase; margin-bottom: 20px; position: relative; padding-bottom: 8px; }
.footer-title::after { content: ''; position: absolute; left: 0; bottom: 0; width: 30px; height: 2px; background: #6FA3FF; }
.footer-nav { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.footer-nav a { color: rgba(255,255,255,0.8); font-size: 14px; transition: all 0.2s; }
.footer-nav a:hover { color: #A5C4FF; padding-left: 5px; }
.footer-contact p { margin-bottom: 10px; color: rgba(255,255,255,0.8); font-size: 13px; }
.footer-contact strong { color: #ffffff; }
.footer-bottom { background: #0E2B78; padding: 18px 0; }
.footer-bottom .footer-container { display: flex; justify-content: space-between; align-items: center; grid-template-columns: none; flex-wrap: wrap; gap: 10px; }
.copyright { color: rgba(255,255,255,0.7); font-size: 13px; margin: 0; }
.footer-age { color: #A5C4FF; font-size: 13px; font-weight: 700; }
#copyright-year { font-weight: bold; }
@media (max-width: 768px) {
  :root { --header-offset: 146px; }
  .site-header { background: #F4F7FB; }
  .marquee-section { padding: 5px 0; }
  .header-top { background: #1A3CA8; }
  .header-container { width: 100%; max-width: none; padding-left: 12px; padding-right: 12px; justify-content: center; }
  .logo { padding: 0; font-size: 28px; }
  .desktop-nav-buttons { display: none; }
  .hamburger-menu { display: flex; flex-direction: column; width: 44px; height: 44px; justify-content: center; align-items: center; gap: 6px; background: transparent; border: none; cursor: pointer; z-index: 1001; position: absolute; left: 10px; top: 48px; padding: 8px; border-radius: 50%; background: rgba(255,255,255,0.1); }
  .hamburger-menu span { display: block; width: 22px; height: 2px; background: #ffffff; border-radius: 2px; transition: all 0.3s ease; }
  .hamburger-menu.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); background: #fff; }
  .hamburger-menu.active span:nth-child(2) { opacity: 0; }
  .hamburger-menu.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); background: #fff; }
  .main-nav { display: none; position: fixed; top: 108px; left: 0; right: 0; background: #FFFFFF; flex-direction: column; transform: translateX(-100%); transition: transform 0.3s ease; height: auto; max-height: calc(100vh - 133px); overflow-y: auto; border-radius: 0 0 12px 12px; border-bottom: 2px solid #2F6BFF; }
  .main-nav.active { display: flex; transform: translateX(0); }
  .main-nav .nav-container { width: 100%; max-width: none; flex-direction: column; align-items: stretch; padding: 0; }
  .main-nav .nav-link { display: block; padding: 12px 25px; font-size: 15px; border-bottom: 1px solid #f0f0f0; text-align: left; color: #1F2D3D; }
  .main-nav .nav-link:hover { background: #2F6BFF; color: #fff; }
  .main-nav .nav-link:last-child { border-bottom: none; }
  .mobile-menu-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); z-index: 998; }
  .mobile-menu-overlay.active { display: block; }
  .mobile-nav-buttons { display: flex; justify-content: center; gap: 8px; padding: 7px 10px 8px; background: #F4F7FB; position: relative; z-index: 997; }
  .mobile-nav-buttons .btn { padding: 7px 14px; font-size: 13px; color: #fff; border-radius: 20px; }
  .mobile-nav-buttons .btn-download { background: #ffffff; color: #1F2D3D; border: 1px solid #1A3CA8; }
  .mobile-nav-buttons .btn-login { background: transparent; color: #1F2D3D; border: 1px solid #1A3CA8; }
  .mobile-nav-buttons .btn-register { background: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); color: #fff; border: none; }
  .page-content img { max-width: 100% !important; height: auto !important; display: block; }
  .page-content { overflow-x: hidden; max-width: 100%; }
  body { overflow-x: hidden; }
  .footer-container { grid-template-columns: 1fr 1fr; gap: 25px; padding: 0 15px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom .footer-container { flex-direction: column; text-align: center; }
  .footer-contact p { font-size: 12px; }
  .footer-nav a { font-size: 13px; }
  .footer-title { font-size: 14px; }
}
/* 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;
}