:root { --primary-color: #26A9E0; --secondary-color: #FFFFFF; --login-color: #EA7C07; --bg-color: #FFFFFF; --black-color: #000000; --header-offset: 122px; }
body { margin: 0; padding: 0; padding-top: var(--header-offset); font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: var(--bg-color); color: #333; }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; box-shadow: 0 2px 12px rgba(0,0,0,0.15); background-color: #333; min-height: auto; }
.header-top { background-color: var(--primary-color); width: 100%; }
.header-container { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 10px 30px; }
.logo { font-size: 28px; font-weight: 800; color: #fff !important; text-decoration: none; letter-spacing: 1px; text-transform: lowercase; display: inline-block; }
.desktop-nav-buttons { display: flex; gap: 12px; align-items: center; }
.btn { display: inline-block; padding: 10px 24px; border-radius: 30px; font-size: 14px; font-weight: 700; text-decoration: none; text-align: center; transition: all 0.3s ease; border: 2px solid transparent; }
.btn-login { background-color: var(--login-color); color: #fff; }
.btn-login:hover { background-color: #d47206; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(215, 114, 6, 0.4); }
.btn-register { background: linear-gradient(135deg, #1fd4c3, #0099cc); color: #fff; }
.btn-register:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0, 153, 204, 0.5); }
.main-nav { background-color: #fff; width: 100%; display: flex; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; padding: 8px 20px; gap: 4px; }
.nav-link { display: inline-block; padding: 6px 14px; color: #333; text-decoration: none; font-size: 14px; font-weight: 600; border-radius: 20px; transition: background-color 0.3s, color 0.3s; }
.nav-link:hover { background-color: #e6f4fc; color: var(--primary-color); }
.mobile-nav-buttons { display: none; }
.hamburger-menu { display: none; }
.mobile-menu-overlay { display: none; }
.site-footer { background-color: #1e2a38; color: #ccc; padding: 50px 0 0; margin-top: 60px; }
.footer-container { max-width: 1200px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 40px; padding: 0 30px 40px; }
.footer-about { flex: 1 1 300px; }
.footer-logo { font-size: 26px; font-weight: 800; color: #fff; text-decoration: none; display: block; margin-bottom: 15px; }
.footer-about p { font-size: 14px; line-height: 1.7; max-width: 340px; }
.footer-nav-column { flex: 1 1 200px; }
.footer-nav-column h3 { color: #fff; font-size: 16px; margin-bottom: 18px; font-weight: 600; }
.footer-nav { display: flex; flex-direction: column; gap: 10px; }
.footer-nav a { color: #aaa; text-decoration: none; font-size: 14px; transition: color 0.3s; }
.footer-nav a:hover { color: var(--primary-color); }
.footer-bottom { background-color: #15202b; padding: 20px; text-align: center; }
.footer-bottom p { margin: 0; font-size: 14px; color: #888; }
@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  .header-top { background-color: var(--primary-color); }
  .header-container { width: 100%; max-width: none; padding: 8px 15px; display: flex; justify-content: center; position: relative; }
  .logo { margin: 0 auto; }
  .desktop-nav-buttons { display: none; }
  .main-nav { display: none; flex-direction: column; position: fixed; top: 0; right: 0; width: 280px; height: 100vh; overflow-y: auto; background-color: #fff; z-index: 1001; box-shadow: -4px 0 15px rgba(0,0,0,0.2); transform: translateX(100%); transition: transform 0.3s ease; padding-top: 70px; }
  .main-nav.active { display: flex; transform: translateX(0); }
  .nav-container { width: 100%; max-width: none; flex-direction: column; align-items: stretch; padding: 0; }
  .nav-link { padding: 12px 30px; border-bottom: 1px solid #eee; font-size: 15px; border-radius: 0; width: 100%; box-sizing: border-box; }
  .mobile-nav-buttons { display: flex; justify-content: center; align-items: center; gap: 10px; padding: 8px 15px; padding-top: 0; background-color: var(--primary-color); }
  .mobile-nav-buttons .btn { flex: 1; max-width: 140px; padding: 8px 12px; }
  .hamburger-menu { display: flex; flex-direction: column; justify-content: center; gap: 5px; position: absolute; top: 22px; left: 15px; width: 32px; height: 32px; background: transparent; border: none; cursor: pointer; z-index: 1002; }
  .hamburger-menu span { display: block; width: 100%; height: 3px; background-color: #fff; 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); }
  .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; opacity: 0; transition: opacity 0.3s ease; }
  .mobile-menu-overlay.active { display: block; opacity: 1; }
  .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;
}