:root { --header-offset: 122px; --primary-color: #017439; --secondary-color: #FFFFFF; --nav-bg: #004d26; --header-bg: #017439; --text-on-dark: #FFFFFF; --btn-register-bg: #C30808; --btn-login-bg: #C30808; --btn-download-bg: #e67e22; --btn-text-color: #FFFF00; }
body { margin: 0; padding-top: var(--header-offset); font-family: 'Arial', sans-serif; background-color: #FFFFFF; }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; box-shadow: 0 4px 12px rgba(0,0,0,0.15); background-color: var(--header-bg); display: flex; flex-direction: column; }
.header-top { background-color: var(--header-bg); width: 100%; }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 0 40px; min-height: 68px; box-sizing: border-box; }
.logo { display: block; color: var(--secondary-color); font-size: 32px; font-weight: 800; text-decoration: none; letter-spacing: 2px; text-transform: uppercase; line-height: 1.2; }
.desktop-nav-buttons { display: flex; gap: 12px; align-items: center; }
.btn { display: inline-block; padding: 10px 20px; border-radius: 6px; font-size: 14px; font-weight: 700; text-decoration: none; text-align: center; cursor: pointer; transition: transform 0.2s ease, box-shadow 0.2s ease; color: var(--btn-text-color); border: none; }
.btn:hover { transform: translateY(-2px); box-shadow: 0 4px 8px rgba(0,0,0,0.2); }
.btn-register { background-color: var(--btn-register-bg); }
.btn-login { background-color: var(--btn-login-bg); }
.btn-download { background-color: var(--btn-download-bg); }
.main-nav { background-color: var(--nav-bg); width: 100%; display: flex; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; padding: 0 20px; min-height: 52px; flex-wrap: wrap; box-sizing: border-box; }
.nav-container a { color: var(--text-on-dark); text-decoration: none; font-size: 14px; font-weight: 600; padding: 8px 15px; border-radius: 4px; transition: background-color 0.2s ease, color 0.2s ease; white-space: nowrap; }
.nav-container a:hover { background-color: rgba(255,255,255,0.2); color: var(--secondary-color); }
.mobile-nav-buttons { display: none; }
.hamburger-menu { display: none; }
.mobile-menu-overlay { display: none; }
.site-footer { background-color: #1a1a1a; color: #e0e0e0; padding: 50px 0 0; margin-top: 60px; }
.footer-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.footer-top { display: grid; grid-template-columns: 1.5fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-logo { font-size: 28px; color: #fff; text-decoration: none; font-weight: 800; letter-spacing: 1px; }
.footer-info p { font-size: 14px; line-height: 1.6; margin-top: 15px; color: #aaa; }
.footer-nav h4 { color: #fff; font-size: 16px; margin-bottom: 15px; }
.footer-nav ul { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 8px 20px; }
.footer-nav ul li a { color: #aaa; text-decoration: none; font-size: 14px; transition: color 0.2s; }
.footer-nav ul li a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #333; padding: 20px 0; text-align: center; font-size: 14px; color: #888; }
@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  .header-container { width: 100%; max-width: none; padding: 0 15px; min-height: 60px; box-sizing: border-box; }
  .nav-container { width: 100%; max-width: none; padding: 0 15px; box-sizing: border-box; }
  .logo { font-size: 28px; }
  .desktop-nav-buttons { display: none; }
  .main-nav { display: none; position: fixed; top: 0; left: 0; width: 260px; height: 100%; background-color: var(--nav-bg); flex-direction: column; justify-content: flex-start; align-items: flex-start; padding-top: 60px; transform: translateX(-100%); transition: transform 0.3s ease; box-shadow: 2px 0 12px rgba(0,0,0,0.2); overflow-y: auto; }
  .main-nav.active { display: flex; transform: translateX(0); }
  .main-nav .nav-container { display: flex; flex-direction: column; justify-content: flex-start; align-items: flex-start; max-width: none; padding: 0; }
  .main-nav .nav-container a { color: var(--text-on-dark); font-size: 16px; padding: 12px 15px; width: 100%; box-sizing: border-box; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .main-nav .nav-container a:hover { background-color: rgba(255,255,255,0.1); }
  .hamburger-menu { display: block; z-index: 1002; position: absolute; top: 18px; left: 15px; width: 30px; height: 24px; cursor: pointer; background: none; border: none; padding: 0; }
  .hamburger-menu span { display: block; width: 100%; height: 3px; background-color: var(--secondary-color); margin: 5px 0; transition: transform 0.3s ease, opacity 0.3s ease; border-radius: 2px; }
  .hamburger-menu.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .hamburger-menu.active span:nth-child(2) { opacity: 0; }
  .hamburger-menu.active span:nth-child(3) { transform: rotate(-45deg) translate(6px, -6px); }
  .mobile-menu-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.5); z-index: 999; }
  .mobile-menu-overlay.active { display: block; }
  .mobile-nav-buttons { display: flex; position: sticky; top: 0; gap: 8px; justify-content: center; padding: 8px 15px; background-color: var(--header-bg); z-index: 1000; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
  .btn { padding: 8px 14px; font-size: 13px; }
  .footer-top { grid-template-columns: 1fr; gap: 30px; }
  .footer-nav ul { grid-template-columns: 1fr 1fr; }
  .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;
}