:root{--primary:#2F6BFF;--secondary:#6FA3FF;--btn-grad:linear-gradient(180deg,#4A8BFF 0%,#2F6BFF 100%);--card-bg:#FFFFFF;--bg:#F4F7FB;--text-main:#1F2D3D;--border:#D6E2FF;--glow:#A5C4FF;--header-offset:122px;--footer-bg:#1F2D3D;--footer-text:#E8EEF9;--footer-muted:#A9B8D4;--footer-border:rgba(214,226,255,0.15)}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;padding-top:var(--header-offset);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif;color:var(--text-main);background:var(--bg)}
.site-header{position:fixed;top:0;left:0;right:0;width:100%;z-index:1000;box-shadow:0 4px 24px rgba(31,45,61,0.16);background:#FFFFFF}
.header-top{height:68px;min-height:68px;display:flex;align-items:center;overflow:hidden;background:#FFFFFF;border-bottom:1px solid var(--border);width:100%}
.header-container{height:100%;width:100%;max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding-left:24px;padding-right:24px;gap:16px}
.logo{display:inline-block;font-size:28px;font-weight:800;letter-spacing:-0.5px;color:var(--primary);text-decoration:none;line-height:1;white-space:nowrap}
.logo img{display:block;max-height:60px;height:auto;width:auto;max-width:280px;object-fit:contain}
.hamburger-menu{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;justify-content:center;gap:5px;z-index:1001}
.hamburger-menu span{display:block;width:24px;height:2px;background:var(--primary);border-radius:2px;transition:transform .3s ease,opacity .3s ease}
.hamburger-menu.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger-menu.active span:nth-child(2){opacity:0}
.hamburger-menu.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.desktop-nav-buttons{display:flex;align-items:center;gap:12px}
.mobile-nav-buttons{display:none;min-height:48px}
.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;font-weight:700;border-radius:8px;border:none;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,filter .2s ease;white-space:nowrap;line-height:1.2}
.btn-login{background:transparent;color:var(--primary);border:2px solid var(--primary);padding:10px 20px;font-size:15px}
.btn-login:hover{background:var(--primary);color:#FFFFFF;transform:translateY(-1px)}
.btn-register{background:var(--btn-grad);color:#FFFFFF;padding:12px 24px;font-size:15px;box-shadow:0 4px 14px rgba(47,107,255,0.35)}
.btn-register:hover{filter:brightness(1.06);transform:translateY(-1px);box-shadow:0 6px 20px rgba(47,107,255,0.45)}
.main-nav{height:52px;min-height:52px;display:flex;align-items:center;overflow:hidden;background:var(--primary);width:100%}
.nav-container{height:100%;width:100%;max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:center;padding:0 20px}
.nav-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:row;align-items:center;justify-content:center;gap:4px;flex-wrap:nowrap}
.nav-link{display:block;padding:8px 12px;color:#FFFFFF;text-decoration:none;font-size:14px;font-weight:600;border-radius:6px;white-space:nowrap;transition:background .2s ease,color .2s ease}
.nav-link:hover{background:rgba(255,255,255,0.18);color:#FFFFFF}
.nav-overlay{display:none;position:fixed;inset:0;background:rgba(31,45,61,0.55);z-index:999;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease}
.nav-overlay.active{opacity:1;visibility:visible}
.site-footer{background:var(--footer-bg);color:var(--footer-text);margin-top:40px}
.footer-container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
.footer-top{padding:48px 0 32px}
.footer-top-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px}
.footer-col{min-width:0}
.footer-logo{display:inline-block;font-size:26px;font-weight:800;color:#FFFFFF;text-decoration:none;margin-bottom:14px;letter-spacing:-0.5px}
.footer-description{color:var(--footer-muted);font-size:14px;line-height:1.7;margin:0 0 12px;word-wrap:break-word;overflow-wrap:break-word}
.footer-title{font-size:16px;font-weight:700;color:#FFFFFF;margin:0 0 16px;padding-bottom:10px;border-bottom:1px solid var(--footer-border)}
.footer-nav{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.footer-nav a{color:var(--footer-muted);text-decoration:none;font-size:14px;transition:color .2s ease,padding-left .2s ease;display:inline-block}
.footer-nav a:hover{color:#FFFFFF;padding-left:4px}
.footer-dynamic-col{min-width:0}
.footer-slot-anchor{display:block;width:100%}
.footer-slot-anchor-inner{display:block;width:100%}
.footer-mid{padding:8px 0 24px}
.footer-mid-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:12px}
.footer-bottom{background:rgba(0,0,0,0.22);padding:18px 0;border-top:1px solid var(--footer-border)}
.copyright{margin:0;text-align:center;color:var(--footer-muted);font-size:13px;line-height:1.6}
@media (max-width:768px){
  :root{--header-offset:110px}
  .header-top{height:60px !important;min-height:60px !important}
  .header-container{width:100%;max-width:none;padding-left:15px;padding-right:15px;position:relative}
  .hamburger-menu{display:flex;order:-1}
  .logo{flex:1 !important;display:flex !important;justify-content:center !important;align-items:center !important;font-size:24px}
  .logo img{display:block !important;max-width:100%;height:auto;max-height:56px}
  .desktop-nav-buttons{display:none !important}
  .mobile-nav-buttons{display:flex !important;align-items:center;justify-content:center;width:100%;max-width:100%;box-sizing:border-box;padding:8px 15px;overflow:hidden;gap:10px;flex-wrap:nowrap;background:#FFFFFF;border-bottom:1px solid var(--border)}
  .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}
  .main-nav{height:48px !important;min-height:48px !important;display:none;position:fixed;top:var(--header-offset);left:0;right:0;width:100%;flex-direction:column;align-items:stretch;overflow-y:auto;transform:translateX(-100%);transition:transform .3s ease;z-index:1002;background:var(--primary);box-shadow:0 8px 24px rgba(31,45,61,0.25)}
  .main-nav.active{display:block;transform:translateX(0)}
  .nav-container{width:100%;max-width:none;padding:8px 12px;height:auto;display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .nav-link{padding:12px 16px;font-size:15px;border-radius:6px}
  .nav-overlay{display:block}
  .footer-top-grid{grid-template-columns:1fr;gap:24px}
  .footer-mid-grid{grid-template-columns:1fr;gap:12px}
  .footer-top{padding:32px 0 24px}
  .footer-container{padding:0 15px}
  .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;
}