:root { --header-offset: 122px; --primary: #113B7A; --primary-2: #1D5FD1; --btn-grad: linear-gradient(180deg, #2B73F6 0%, #1144A6 100%); --card-bg: #10233F; --text-main: #F3F8FF; --text-sec: #AFC4E8; --border: #244D84; --glow: #4FA8FF; --gold: #F2C14E; --divider: #1B3357; --deep-navy: #08162B; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body { padding-top: var(--header-offset); background-color: var(--deep-navy); color: var(--text-main); font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
a { text-decoration: none; color: inherit; transition: color 0.3s ease; }
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4); background-color: var(--deep-navy); }
.header-top { background-color: var(--deep-navy); display: block; border-bottom: 1px solid var(--divider); }
.header-container { max-width: 1200px; margin: 0 auto; height: 68px; display: flex; justify-content: space-between; align-items: center; padding-left: 30px; padding-right: 30px; }
.logo { display: inline-block; font-size: 26px; font-weight: 800; color: var(--gold); letter-spacing: 0.5px; line-height: 1.2; text-transform: uppercase; }
.logo:hover { color: #fff; text-shadow: 0 0 10px rgba(242, 193, 78, 0.5); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.btn { display: inline-block; padding: 10px 26px; border-radius: 6px; font-weight: 700; font-size: 15px; line-height: 1.2; text-align: center; border: none; cursor: pointer; transition: all 0.3s ease;
}
.btn-register { background: var(--btn-grad); color: var(--text-main); box-shadow: 0 4px 14px rgba(43, 115, 246, 0.4); border: 1px solid var(--glow); }
.btn-register:hover { background: linear-gradient(180deg, #4A8DF7 0%, #1D55B4 100%); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(79, 168, 255, 0.5); }
.btn-login { background: var(--gold); color: var(--deep-navy); box-shadow: 0 4px 14px rgba(242, 193, 78, 0.3); }
.btn-login:hover { background: #ffd76a; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(242, 193, 78, 0.5); }
.btn-support { background: var(--btn-grad); color: var(--text-main); margin-top: 10px; }
.btn-support:hover { background: linear-gradient(180deg, #4A8DF7 0%, #1D55B4 100%); box-shadow: 0 4px 14px rgba(79, 168, 255, 0.5); }
.main-nav { background-color: var(--primary); display: flex; flex-direction: row; position: static; width: 100%; }
.nav-container { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: row; justify-content: center; align-items: center; gap: 4px; padding: 6px 20px; flex-wrap: wrap; }
.nav-link { display: inline-block; padding: 8px 14px; color: var(--text-main); font-size: 15px; font-weight: 600; border-radius: 4px; transition: background-color 0.3s ease, color 0.3s ease; }
.nav-link:hover { background-color: rgba(255, 255, 255, 0.15); color: var(--gold); }
.nav-link.active { background-color: rgba(255, 255, 255, 0.15); color: var(--gold); }
.hamburger-menu { display: none; background: none; border: none; cursor: pointer; padding: 6px; z-index: 1001; }
.hamburger-menu span { display: block; width: 26px; height: 3px; margin: 5px 0; background-color: var(--gold); border-radius: 3px; transition: all 0.3s ease; }
.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; backdrop-filter: blur(2px); opacity: 0; transition: opacity 0.3s ease; }
.mobile-menu-overlay.active { display: block; opacity: 1; }
.mobile-nav-buttons { display: none; background-color: var(--deep-navy); padding: 8px 15px; gap: 10px; z-index: 999; }
/* Footer Styles */
.site-footer { background-color: var(--deep-navy); border-top: 2px solid var(--glow); margin-top: 60px; }
.footer-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; padding: 50px 30px 30px; }
.footer-brand .footer-logo { display: inline-block; font-size: 24px; font-weight: 800; color: var(--gold); margin-bottom: 18px; }
.footer-description { color: var(--text-sec); font-size: 14px; line-height: 1.7; }
.footer-title { color: var(--gold); font-size: 16px; font-weight: 700; margin-bottom: 18px; text-transform: uppercase; letter-spacing: 1px; }
.footer-nav { list-style: none; padding: 0; }
.footer-nav li { margin-bottom: 12px; }
.footer-nav li a { color: var(--text-sec); font-size: 14px; transition: color 0.3s ease, padding-left 0.3s ease; }
.footer-nav li a:hover { color: var(--gold); padding-left: 4px; }
.footer-desc { color: var(--text-sec); font-size: 14px; line-height: 1.7; margin-bottom: 15px; }
.footer-bottom { border-top: 1px solid var(--divider); text-align: center; padding: 20px 15px; }
.copyright { color: var(--text-sec); font-size: 14px; }
@media (max-width: 768px) {
  :root { --header-offset: 110px; }
  .header-container { width: 100%; max-width: none; height: 60px; padding-left: 15px; padding-right: 15px; }
  .nav-container { width: 100%; max-width: none; padding-left: 15px; padding-right: 15px; }
  .hamburger-menu { display: block; margin-right: 5px; }
  .header-top { position: relative; z-index: 999; }
  .header-container { justify-content: flex-start; position: relative; }
  .hamburger-menu { order: 1; }
  .logo { order: 2; flex: 1; text-align: center; font-size: 22px; }
  .header-actions { display: none; }
  .main-nav { display: none; flex-direction: column; position: fixed; top: 60px; left: 0; width: 78%; max-width: 320px; height: calc(100% - 108px); background: var(--deep-navy); z-index: 999; transform: translateX(-100%); transition: transform 0.3s ease; overflow-y: auto; border-right: 2px solid var(--glow); }
  .main-nav.active { display: flex; transform: translateX(0); }
  .nav-container { flex-direction: column; align-items: stretch; padding: 15px 0; width: 100%; max-width: none; }
  .nav-link { padding: 12px 24px; border-bottom: 1px solid var(--divider); text-align: left; font-size: 16px; width: 100%; }
  .hamburger-menu.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
  .hamburger-menu.active span:nth-child(2) { opacity: 0; }
  .hamburger-menu.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }
  .mobile-menu-overlay.active { display: block; opacity: 1; }
  .mobile-nav-buttons { display: flex; justify-content: center; align-items: center; gap: 10px; width: 100%; position: fixed; top: 60px; left: 0; z-index: 1000; border-bottom: 1px solid var(--divider); }
  .mobile-nav-buttons .btn { flex: 1; max-width: 180px; padding: 8px 15px; font-size: 14px; }
  body.no-scroll { overflow: hidden; }
  .footer-container { grid-template-columns: 1fr 1fr; gap: 30px; padding: 30px 20px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { text-align: center; padding: 18px; }
}
@media (max-width: 480px) {
  :root { --header-offset: 108px; }
  .header-container { height: 60px; padding-left: 10px; padding-right: 10px; }
  .logo { font-size: 18px; }
  .main-nav { top: 108px; height: calc(100% - 108px); width: 80%; }
  .mobile-nav-buttons { top: 60px; padding: 6px 8px; gap: 8px; }
  .mobile-nav-buttons .btn { padding: 8px 10px; font-size: 13px; }
  .footer-container { grid-template-columns: 1fr; gap: 25px; padding: 25px 15px; }
  .footer-links { text-align: center; }
  .footer-title { text-align: 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;
}