.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;display:flex;flex-direction:column;background:#1F2D3D;box-shadow:0 4px 20px rgba(31,45,61,0.25);min-height:auto}body{padding-top:var(--header-offset,122px);margin:0;background:#F4F7FB}.header-top{background:linear-gradient(180deg,#1F2D3D 0%,#2F6BFF 120%);width:100%;border-bottom:1px solid #D6E2FF}.header-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding:0 30px;min-height:68px}.logo{display:block;font-size:38px;font-weight:900;color:#FFFFFF;text-decoration:none;letter-spacing:1px;line-height:1;text-shadow:0 0 15px rgba(165,196,255,0.6)}.logo:hover{color:#FFFFFF;text-decoration:none}.desktop-nav-buttons{display:flex;align-items:center;gap:12px}.main-nav{background:#2F6BFF;width:100%;display:flex;align-items:center;min-height:52px;border-bottom:2px solid rgba(255,255,255,0.08)}.nav-container{max-width:1200px;margin:0 auto;display:flex;flex-direction:row;justify-content:center;align-items:center;gap:4px;padding:0 15px;width:100%;flex-wrap:wrap}.nav-link{display:inline-flex;align-items:center;color:#FFFFFF;font-size:15px;font-weight:700;text-decoration:none;padding:0 14px;min-height:40px;position:relative;transition:all 0.3s ease;border-radius:8px}.nav-link:after{content:'';position:absolute;bottom:4px;left:14px;right:14px;height:2px;background:#A5C4FF;border-radius:2px;transform:scaleX(0);transition:transform 0.3s ease}.nav-link:hover{color:#A5C4FF}.nav-link:hover:after{transform:scaleX(1)}.nav-link.active{color:#A5C4FF}.nav-link.active:after{transform:scaleX(1)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;border-radius:50px;font-weight:800;font-size:15px;text-decoration:none;transition:all 0.3s ease;border:none;cursor:pointer;letter-spacing:0.3px;text-transform:none;box-shadow:0 4px 12px rgba(47,107,255,0.3)}.btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(47,107,255,0.45);text-decoration:none}.btn-register{background:linear-gradient(180deg,#4A8BFF 0%,#2F6BFF 100%);color:#FFFFFF}.btn-register:hover{color:#FFFFFF}.btn-login{background:#FFFFFF;color:#2F6BFF;border:2px solid #2F6BFF}.btn-login:hover{background:#F4F7FB;color:#2F6BFF}.hamburger-menu,.mobile-nav-buttons,.mobile-menu-overlay{display:none}.site-footer{background:#1F2D3D;color:#FFFFFF;padding:60px 0 0;margin-top:60px}.footer-container{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;padding:0 20px 40px}.footer-brand{display:flex;flex-direction:column;gap:15px}.footer-logo{font-size:32px;font-weight:900;color:#FFFFFF;text-decoration:none;display:inline-block}.footer-logo:hover{color:#A5C4FF}.footer-desc{color:#B0BEC5;font-size:14px;line-height:1.6;margin:0}.footer-title{display:block;color:#FFFFFF;font-size:18px;font-weight:800;margin-bottom:20px;position:relative;padding-bottom:10px}.footer-title:after{content:'';position:absolute;bottom:0;left:0;width:30px;height:3px;background:#2F6BFF;border-radius:2px}.footer-links ul{list-style:none;padding:0;margin:0}.footer-links li{margin-bottom:12px}.footer-links a{color:#B0BEC5;text-decoration:none;font-size:14px;transition:all 0.3s ease;padding-left:0}.footer-links a:hover{color:#6FA3FF;padding-left:6px}.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding:20px;text-align:center;color:#B0BEC5;font-size:14px;background:#16202B;display:flex;flex-direction:column;gap:8px;align-items:center}.footer-bottom p{margin:0}.copyright{font-size:14px}.footer-bottom a{color:#6FA3FF;text-decoration:none}.footer-bottom a:hover{text-decoration:underline}@media(max-width:768px){body{padding-top:var(--header-offset,110px)}.header-container{width:100%;max-width:none;padding:0 15px;justify-content:space-between;min-height:60px}.logo{font-size:30px}.desktop-nav-buttons{display:none}.main-nav{display:none;position:fixed;top:0;right:0;width:320px;max-width:85vw;height:100vh;height:100dvh;flex-direction:column;background:#1F2D3D;box-shadow:-4px 0 20px rgba(0,0,0,0.3);z-index:2001;align-items:stretch;padding-top:20px;overflow-y:auto;transform:translateX(100%);transition:transform 0.3s ease-in-out}.main-nav.active{display:flex;transform:translateX(0)}.nav-container{flex-direction:column;align-items:flex-start;gap:0;padding:0;width:100%;max-width:100%}.nav-link{display:block;width:100%;font-size:14px;min-height:44px;padding:0 24px;line-height:44px;border-bottom:1px solid rgba(255,255,255,0.08);color:#B0BEC5;border-radius:0}.nav-link:hover{background:rgba(47,107,255,0.2);color:#FFFFFF;padding-left:28px}.nav-link:after{display:none}.nav-link.active{color:#2F6BFF;background:rgba(255,255,255,0.1)}.hamburger-menu{display:flex;position:fixed;top:0;left:0;width:48px;height:60px;z-index:2200;background:transparent;border:none;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;padding:0}.hamburger-menu span{display:block;width:22px;height:2.5px;background:#FFFFFF;transition:all 0.4s ease;margin:3px 0;border-radius:2px}.hamburger-menu.active span:nth-child(1){transform:translateY(8.5px) rotate(45deg)}.hamburger-menu.active span:nth-child(2){opacity:0;transform:translateX(-20px)}.hamburger-menu.active span:nth-child(3){transform:translateY(-8.5px) rotate(-45deg)}.mobile-menu-overlay{display:block;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.6);z-index:2000;opacity:0;visibility:hidden;transition:opacity 0.4s ease}.mobile-menu-overlay.active{opacity:1;visibility:visible}.mobile-nav-buttons{display:flex;flex-direction:row;background:#1F2D3D;padding:10px 15px;justify-content:center;gap:10px;flex-wrap:wrap;min-height:48px}.mobile-nav-buttons .btn{flex:1;min-width:140px;padding:8px 12px;font-size:13px}.footer-container{grid-template-columns:1fr;gap:30px;padding:0 15px 30px}.footer-bottom{font-size:12px}.footer-title{font-size:16px;margin-bottom: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}}@media(min-width:769px){.hamburger-menu,.mobile-nav-buttons,.mobile-menu-overlay{display:none!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;
}