:root { --primary-color: #017439; --secondary-color: #FFFFFF; --header-bg-top: #004d26; --header-bg-nav: #017439; --btn-register: #C30808; --btn-login: #C30808; --btn-text: #FFFF00; --footer-bg: #003318; --footer-text: #FFFFFF; --header-offset: 166px; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; padding-top: var(--header-offset); background-color: #f5f5f5; }
a { text-decoration: none; color: inherit; }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25); background-color: var(--header-bg-top); }
.header-top { background-color: var(--header-bg-top); width: 100%; }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; min-height: 68px; padding-left: 30px; padding-right: 30px; }
.logo { font-size: 28px; font-weight: 800; color: var(--secondary-color); letter-spacing: 1px; text-transform: uppercase; display: inline-block; }
.logo:hover { color: var(--btn-text); }
.desktop-nav-buttons { display: flex; gap: 12px; align-items: center; }
.btn { display: inline-block; padding: 10px 24px; border-radius: 30px; font-weight: 700; font-size: 15px; text-decoration: none; border: none; transition: transform 0.2s ease, box-shadow 0.2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-register { background-color: var(--btn-register); color: var(--btn-text); box-shadow: 0 2px 8px rgba(195, 8, 8, 0.4); }
.btn-login { background-color: var(--btn-login); color: var(--btn-text); box-shadow: 0 2px 8px rgba(195, 8, 8, 0.4); }
.main-nav { display: flex; background-color: var(--header-bg-nav); width: 100%; min-height: 52px; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; gap: 0; padding: 0 20px; width: 100%; }
.nav-link { display: inline-block; padding: 14px 16px; color: var(--secondary-color); font-weight: 600; font-size: 15px; line-height: 1.4; transition: background-color 0.3s ease, color 0.3s ease; min-height: 52px; display: flex; align-items: center; }
.nav-link:hover { background-color: rgba(255, 255, 255, 0.2); color: var(--btn-text); }
.mobile-nav-buttons { display: none; }
.hamburger-menu { display: none; }
.mobile-menu-overlay { display: none; }
.site-footer { background-color: var(--footer-bg); color: var(--footer-text); margin-top: 40px; padding-top: 50px; }
.footer-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding: 0 20px 30px; }
.footer-logo { font-size: 24px; font-weight: 800; color: var(--secondary-color); text-transform: uppercase; letter-spacing: 1px; }
.footer-col-link:hover { color: var(--btn-text); }
.footer-description { margin-top: 15px; color: rgba(255, 255, 255, 0.8); font-size: 14px; line-height: 1.6; }
.footer-heading { color: var(--secondary-color); font-size: 18px; font-weight: 700; margin-bottom: 15px; text-transform: uppercase; position: relative; padding-bottom: 8px; }
.footer-heading::after { content: ''; position: absolute; bottom: 0; left: 0; width: 40px; height: 2px; background-color: var(--btn-text); }
.footer-nav { display: flex; flex-direction: column; gap: 8px; }
.footer-link { color: rgba(255, 255, 255, 0.8); font-size: 14px; transition: color 0.3s ease, padding-left 0.3s ease; }
.footer-link:hover { color: var(--btn-text); padding-left: 5px; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); padding: 20px 0; text-align: center; }
.copyright { color: rgba(255, 255, 255, 0.6); font-size: 14px; }
@media (max-width: 992px) {
  .nav-link { padding: 14px 10px; font-size: 14px; }
}
@media (max-width: 768px) {
  :root { --header-offset: 146px; }
  .header-top { min-height: 60px; }
  .header-container { min-height: 60px; padding-left: 15px; padding-right: 15px; width: 100%; max-width: none; position: relative; }
  .site-header { min-height: 0; }
  .hamburger-menu { display: flex; flex-direction: column; justify-content: center; gap: 5px; width: 40px; height: 40px; background: transparent; border: none; cursor: pointer; position: absolute; left: 15px; top: 50%; transform: translateY(-50%); z-index: 1001; padding: 8px; }
  .hamburger-menu span { display: block; width: 100%; height: 3px; background-color: var(--secondary-color); border-radius: 3px; transition: all 0.3s ease; }
  .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); }
  .logo { font-size: 22px; position: absolute; left: 50%; transform: translateX(-50%); }
  .desktop-nav-buttons { display: none; }
  .mobile-nav-buttons { display: flex; justify-content: center; gap: 10px; padding: 10px 15px; background-color: #004d26; }
  .mobile-nav-buttons .btn { flex: 1; text-align: center; padding: 10px 12px; font-size: 14px; font-weight: 700; background-color: var(--btn-register); color: var(--btn-text); border-radius: 25px; max-width: 180px; }
  .main-nav { display: none; position: fixed; top: 0; left: 0; width: 280px; height: 100vh; background-color: var(--header-bg-nav); flex-direction: column; align-items: stretch; padding-top: 80px; z-index: 1000; transform: translateX(-100%); transition: transform 0.3s ease; box-shadow: 2px 0 15px rgba(0, 0, 0, 0.3); }
  .main-nav.active { display: flex; transform: translateX(0); background-color: #017439; }
  .nav-container { flex-direction: column; justify-content: flex-start; align-items: stretch; padding: 0; width: 100%; max-width: none; overflow-y: auto; gap: 0; }
  .nav-link { padding: 15px 20px; font-size: 16px; border-bottom: 1px solid rgba(255, 255, 255, 0.1); min-height: auto; color: var(--secondary-color); }
  .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; }
  body.no-scroll { overflow: hidden; }
  .site-footer { padding-top: 40px; }
  .footer-container { grid-template-columns: 1fr; gap: 30px; text-align: left; padding: 0 15px 25px; }
  .footer-column { text-align: center; }
  .footer-heading { text-align: center; }
  .footer-heading::after { left: 50%; transform: translateX(-50%); }
  .footer-nav { align-items: 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; }
  .header-container { width: 100% !important; max-width: 100% !important; }
  .nav-container { width: 100% !important; max-width: 100% !important; }
}
/* 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;
}