html { scroll-behavior: smooth; }
body { margin: 0; font-family: Arial, sans-serif; line-height: 1.6; color: #1F2D3D; background-color: #F4F7FB; padding-top: var(--header-offset); }
:root { --header-offset: 122px; --primary-color: #2F6BFF; --accent-color: #6FA3FF; --text-main: #1F2D3D; --card-bg: #FFFFFF; --border-color: #D6E2FF; --button-gradient: linear-gradient(180deg, #4A8BFF 0%, #2F6BFF 100%); --glow-color: #A5C4FF; }
.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: var(--card-bg); }
.header-top { box-sizing: border-box; min-height: 68px; height: 68px; display: flex; align-items: center; overflow: hidden; background-color: #2050CC; width: 100%; padding: 0 20px; }
.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: #FFFFFF; text-decoration: none; display: block; }
.desktop-nav-buttons { display: flex; gap: 12px; align-items: center; }
.btn { background: var(--button-gradient); color: #FFFFFF; padding: 10px 20px; border-radius: 25px; text-decoration: none; font-weight: bold; font-size: 15px; transition: all 0.3s ease; border: none; cursor: pointer; white-space: nowrap; }
.btn:hover { box-shadow: 0 0 10px var(--glow-color); transform: translateY(-2px); }
.mobile-nav-buttons { box-sizing: border-box; display: none; min-height: 48px; background-color: #2050CC; padding: 0 20px; }
.main-nav { box-sizing: border-box; min-height: 52px; height: 52px; display: flex; align-items: center; overflow: hidden; background-color: #4A8BFF; width: 100%; padding: 0 20px; }
.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; }
.nav-link { color: #FFFFFF; text-decoration: none; padding: 8px 15px; font-size: 16px; font-weight: bold; transition: background-color 0.3s ease; white-space: nowrap; }
.nav-link:hover, .nav-link.active { background-color: rgba(255, 255, 255, 0.2); border-radius: 5px; }
.hamburger-menu { display: none; flex-direction: column; justify-content: space-around; width: 30px; height: 25px; cursor: pointer; padding: 5px; background: transparent; border: none; }
.hamburger-menu .bar { width: 100%; height: 3px; background-color: #FFFFFF; border-radius: 2px; transition: all 0.3s ease; }
.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 { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); z-index: 999; opacity: 0; transition: opacity 0.3s ease; }
.overlay.active { display: block; opacity: 1; }
.site-footer { background-color: #1F2D3D; color: #F4F7FB; padding: 40px 20px 20px; font-size: 14px; }
.footer-top-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 1200px; margin: 0 auto 30px; }
.footer-col { padding: 10px 0; }
.footer-about .footer-logo { font-size: 24px; font-weight: bold; color: #FFFFFF; text-decoration: none; margin-bottom: 15px; display: block; }
.footer-description { color: #D6E2FF; line-height: 1.8; word-wrap: break-word; overflow-wrap: break-word; }
.footer-heading { font-size: 18px; color: #FFFFFF; margin-bottom: 15px; }
.footer-nav { list-style: none; padding: 0; margin: 0; }
.footer-nav li { margin-bottom: 8px; }
.footer-nav a { color: #D6E2FF; text-decoration: none; transition: color 0.3s ease; }
.footer-nav a:hover { color: var(--accent-color); }
.footer-dynamic-col { display: flex; justify-content: flex-end; align-items: flex-start; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); padding-top: 20px; text-align: center; color: #D6E2FF; max-width: 1200px; margin: 0 auto; }
.footer-bottom a { text-decoration: none; color: #D6E2FF; }
.footer-bottom a:hover { color: var(--accent-color); }
.footer-slot-anchor-inner { min-height: 1px; }
@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  .header-top { min-height: 60px !important; height: 60px !important; padding: 0 15px; }
  .header-container { max-width: none; padding: 0; position: relative; }
  .logo { flex: 1 !important; display: flex !important; justify-content: center !important; align-items: center !important; font-size: 24px; }
  .desktop-nav-buttons { display: none !important; }
  .mobile-nav-buttons {
    display: flex !important;
    min-height: 48px;
    align-items: center;
    width: 100%; max-width: 100%;
    box-sizing: border-box;
    padding-left: 15px; padding-right: 15px;
    overflow: hidden;
    gap: 10px;
    flex-wrap: nowrap;
    justify-content: center;
  }
  .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;
  }
  .hamburger-menu { display: flex; position: absolute; left: 15px; z-index: 1001; }
  .main-nav {
    min-height: 48px !important; height: auto !important;
    display: none; flex-direction: column; position: fixed; top: var(--header-offset); left: 0; width: 80%; max-width: 300px; height: calc(100% - var(--header-offset)); background-color: #2050CC; box-shadow: 2px 0 5px rgba(0, 0, 0, 0.2); transform: translateX(-100%); transition: transform 0.3s ease; z-index: 1000;
    padding: 20px 0;
  }
  .main-nav.active { display: flex; transform: translateX(0); }
  .nav-container { flex-direction: column; align-items: flex-start; padding: 0 15px; height: auto; max-width: none; width: 100%; }
  .nav-link { width: 100%; padding: 12px 15px; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
  .nav-link:last-child { border-bottom: none; }
  .footer-top-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-col { text-align: center; }
  .footer-about .footer-logo { margin-bottom: 10px; }
  .footer-heading { margin-top: 20px; }
  .footer-nav { padding-top: 5px; }
  .footer-nav li { margin-bottom: 5px; }
  .footer-dynamic-col { justify-content: center; }
  .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;
  }
}
/* 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;
}