:root{--primary:#2F6BFF;--secondary:#6FA3FF;--bg:#F4F7FB;--card-bg:#FFFFFF;--text-main:#1F2D3D;--border:#D6E2FF;--glow:#A5C4FF;--btn-gradient:linear-gradient(180deg,#4A8BFF 0%,#2F6BFF 100%);--header-offset:122px;}
*,*::before,*::after{box-sizing:border-box;}
body{margin:0;padding-top:var(--header-offset);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;color:var(--text-main);background-color:var(--bg);}
img{max-width:100%;height:auto;}
a{text-decoration:none;color:inherit;}
.site-header{position:fixed;top:0;left:0;right:0;width:100%;z-index:1000;box-shadow:0 4px 18px rgba(47,107,255,0.18);}
.header-top{box-sizing:border-box;height:68px;min-height:68px;display:flex;align-items:center;overflow:hidden;background:linear-gradient(135deg,#1E4FD6 0%,#2F6BFF 100%);width:100%;}
.header-container{box-sizing:border-box;width:100%;height:100%;max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding-left:24px;padding-right:24px;gap:16px;position:relative;}
.logo{display:inline-flex;align-items:center;font-size:22px;font-weight:800;letter-spacing:0.5px;color:#FFFFFF;white-space:nowrap;text-shadow:0 1px 2px rgba(0,0,0,0.15);}
.logo:hover{opacity:0.92;}
.logo img{display:block;max-height:60px;height:auto;width:auto;max-width:280px;object-fit:contain;}
.desktop-nav-buttons{display:flex;gap:12px;align-items:center;}
.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;font-weight:700;line-height:1.2;border-radius:8px;border:1px solid transparent;cursor:pointer;transition:transform 0.2s ease,box-shadow 0.2s ease,filter 0.2s ease;white-space:nowrap;}
.desktop-nav-buttons .btn{padding:10px 22px;font-size:15px;}
.btn-login{background:transparent;color:#FFFFFF;border:1px solid rgba(255,255,255,0.7);}
.btn-login:hover{background:rgba(255,255,255,0.14);}
.btn-register{background:var(--btn-gradient);color:#FFFFFF;box-shadow:0 4px 12px rgba(47,107,255,0.45);}
.btn-register:hover{filter:brightness(1.07);transform:translateY(-1px);box-shadow:0 6px 16px rgba(47,107,255,0.55);}
.hamburger-menu{display:none;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:44px;height:44px;padding:0;background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.35);border-radius:8px;cursor:pointer;z-index:1001;}
.hamburger-menu span{display:block;width:22px;height:2.5px;background:#FFFFFF;border-radius:2px;transition:transform 0.3s ease,opacity 0.3s ease;}
.hamburger-menu.active span:nth-child(1){transform:translateY(7.5px) rotate(45deg);}
.hamburger-menu.active span:nth-child(2){opacity:0;}
.hamburger-menu.active span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg);}
.mobile-nav-buttons{box-sizing:border-box;display:none;min-height:48px;}
.main-nav{box-sizing:border-box;height:52px;min-height:52px;display:flex;align-items:center;overflow:hidden;background-color:#FFFFFF;border-bottom:1px solid var(--border);width:100%;}
.nav-container{box-sizing:border-box;height:100%;width:100%;max-width:1200px;margin:0 auto;display:flex;flex-direction:row;justify-content:center;align-items:center;padding:0 20px;}
.nav-list{display:flex;flex-direction:row;justify-content:center;align-items:center;gap:6px;list-style:none;margin:0;padding:0;flex-wrap:nowrap;}
.nav-link{display:inline-block;padding:8px 14px;font-size:15px;font-weight:600;color:var(--text-main);border-radius:6px;transition:background-color 0.2s ease,color 0.2s ease;white-space:nowrap;}
.nav-link:hover{background-color:var(--glow);color:#14307A;}
.nav-link.active{background:var(--btn-gradient);color:#FFFFFF;box-shadow:0 3px 10px rgba(47,107,255,0.35);}
.nav-overlay{position:fixed;inset:0;background:rgba(15,30,60,0.55);opacity:0;visibility:hidden;transition:opacity 0.3s ease,visibility 0.3s ease;z-index:999;}
.nav-overlay.active{opacity:1;visibility:visible;}
body.no-scroll{overflow:hidden;}
.site-footer{background:#0F2452;color:#DCE6FF;margin-top:40px;}
.footer-container{box-sizing:border-box;width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
.footer-top{padding:48px 0 32px;background:linear-gradient(180deg,#12316E 0%,#0F2452 100%);}
.footer-top-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;align-items:start;}
.footer-col{min-width:0;}
.footer-logo{display:inline-block;font-size:22px;font-weight:800;color:#FFFFFF;letter-spacing:0.5px;margin-bottom:12px;}
.footer-logo:hover{color:var(--glow);}
.footer-description{font-size:14px;line-height:1.7;color:#BFD1F5;margin:0 0 14px;word-wrap:break-word;overflow-wrap:break-word;}
.footer-title{font-size:16px;font-weight:700;color:#FFFFFF;margin:0 0 14px;position:relative;padding-bottom:8px;}
.footer-title::after{content:'';position:absolute;left:0;bottom:0;width:34px;height:3px;border-radius:2px;background:var(--btn-gradient);}
.footer-nav{list-style:none;margin:0;padding:0;}
.footer-nav li{margin-bottom:9px;}
.footer-nav a{font-size:14px;color:#BFD1F5;transition:color 0.2s ease,padding-left 0.2s ease;display:inline-block;}
.footer-nav a:hover{color:#FFFFFF;padding-left:4px;}
.footer-dynamic-col{min-height:1px;}
.footer-mid{padding:28px 0;background:#0C1E45;border-top:1px solid rgba(165,196,255,0.16);}
.footer-mid-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.footer-slot-bottom{background:#0C1E45;}
.footer-slot-anchor-inner{display:block;}
.footer-bottom{background:#081634;padding:18px 0;border-top:1px solid rgba(165,196,255,0.14);}
.footer-copyright{margin:0;text-align:center;font-size:13px;color:#9FB4DC;line-height:1.6;}
@media (max-width:768px){
  :root{--header-offset:110px;}
  .header-top{height:60px;min-height:60px;}
  .header-container{width:100%;max-width:none;padding-left:15px;padding-right:15px;gap:8px;}
  .main-nav{height:48px;min-height:48px;display:none;position:fixed;top:var(--header-offset);left:0;right:0;width:100%;flex-direction:column;overflow-y:auto;padding:0;border-bottom:none;background:#FFFFFF;box-shadow:0 12px 28px rgba(15,30,60,0.22);transform:translateX(-100%);transition:transform 0.3s ease;z-index:1001;}
  .main-nav.active{display:flex;transform:translateX(0);}
  .nav-container{width:100%;max-width:none;height:auto;padding:12px 16px 20px;flex-direction:column;align-items:stretch;justify-content:flex-start;}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px;width:100%;}
  .nav-list li{width:100%;}
  .nav-link{display:block;width:100%;padding:12px 14px;font-size:16px;text-align:left;border-radius:8px;}
  .hamburger-menu{display:flex;position:relative;z-index:1002;order:0;}
  .header-container .logo{flex:1 !important;display:flex !important;justify-content:center !important;align-items:center !important;order:1;text-align:center;}
  .logo img{display:block !important;max-width:100%;height:auto;max-height:56px !important;}
  .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-left:15px;padding-right: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:10px 12px;font-size:13px;white-space:normal;word-wrap:break-word;overflow-wrap:break-word;}
  .mobile-nav-buttons .btn-login{background:var(--card-bg);color:var(--primary);border:1px solid var(--primary);}
  .mobile-nav-buttons .btn-register{background:var(--btn-gradient);color:#FFFFFF;}
  .footer-top-grid{grid-template-columns:1fr;gap:26px;}
  .footer-mid-grid{grid-template-columns:1fr 1fr;gap:16px;}
  .footer-top{padding:36px 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;
}