:root{--primary:#2F6BFF;--primary-light:#6FA3FF;--primary-dark:#1B4FD8;--bg-light:#F4F7FB;--card-bg:#FFFFFF;--border:#D6E2FF;--text-main:#1F2D3D;--text-white:#FFFFFF;--glow:#A5C4FF;--btn-grad:linear-gradient(180deg,#4A8BFF 0%,#2F6BFF 100%);--header-top-bg:#0F2B5B;--nav-bg:#2F6BFF;--footer-bg:#1F2D3D;--footer-text:#FFFFFF;--header-offset:120px;--header-offset-mobile:110px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background-color:var(--bg-light);color:var(--text-main);line-height:1.6;padding-top:var(--header-offset);overflow-x:hidden}.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background-color:var(--header-top-bg);box-shadow:0 4px 20px rgba(0,0,0,.35);display:flex;flex-direction:column;min-height:auto}.header-top{width:100%;background-color:var(--header-top-bg);border-bottom:1px solid rgba(255,255,255,.1)}.header-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding:14px 30px;flex-wrap:wrap;gap:10px}.logo{color:var(--text-white);text-decoration:none;font-size:2.1rem;font-weight:900;letter-spacing:2px;text-transform:uppercase;background:var(--btn-grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:none;padding:6px 0;position:relative;z-index:10;font-family:'Arial Black',Arial,sans-serif;line-height:1.2;display:inline-block}.logo::before{content:'';position:absolute;left:0;bottom:3px;width:100%;height:2px;background:linear-gradient(90deg,transparent,#6FA3FF,transparent);opacity:.6}.desktop-nav-buttons{display:flex;gap:14px;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;padding:12px 24px;border-radius:8px;font-size:.95rem;font-weight:700;letter-spacing:.5px;transition:all .3s ease;border:none;cursor:pointer;min-height:44px;text-transform:none;box-shadow:0 2px 8px rgba(47,107,255,.25)}.btn-register{background:var(--btn-grad);color:#fff;border:1px solid rgba(255,255,255,.2)}.btn-register:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(47,107,255,.45);filter:brightness(1.05)}.btn-login{background:rgba(255,255,255,.12);color:#fff;border:2px solid #6FA3FF;backdrop-filter:none}.btn-login:hover{background:var(--btn-grad);border-color:var(--btn-grad);transform:translateY(-2px);box-shadow:0 6px 20px rgba(111,163,255,.35)}.main-nav{width:100%;background-color:var(--nav-bg);display:flex;justify-content:center;align-items:center;border-top:2px solid rgba(255,255,255,.08);position:static;flex-direction:row;z-index:1000}.nav-container{max-width:1200px;margin:0 auto;display:flex;flex-direction:row;justify-content:center;align-items:center;padding:0 20px;flex-wrap:wrap;gap:0;width:100%}.nav-link{color:#fff;text-decoration:none;font-size:1rem;font-weight:600;padding:14px 15px;display:inline-block;transition:background .3s ease;border-bottom:3px solid transparent;letter-spacing:.3px;line-height:1.4;text-align:center}.nav-link:hover{background:rgba(255,255,255,.12);border-bottom-color:#fff;color:#fff}.nav-link.active{background:rgba(255,255,255,.15);border-bottom-color:#fff;color:#fff}.mobile-menu-overlay{display:none}.mobile-nav-buttons{display:none}.site-footer{background-color:var(--footer-bg);color:var(--footer-text);width:100%;margin-top:60px}.footer-container{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1.4fr .8fr .8fr;gap:40px;padding:60px 30px 40px}.footer-info .footer-logo{font-size:2rem;font-weight:900;color:#fff;text-decoration:none;letter-spacing:2px;text-transform:uppercase;font-family:'Arial Black',Arial,sans-serif;background:linear-gradient(135deg,#6FA3FF,#fff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.footer-desc{font-size:.95rem;color:#B0BEC5;line-height:1.8;margin:18px 0 10px;max-width:400px}.footer-safe{font-size:.9rem;color:#4A8BFF;margin-top:8px;border-top:1px solid rgba(255,255,255,.08);padding-top:14px}.footer-heading{color:#fff;font-size:1.05rem;margin-bottom:22px;font-weight:700;letter-spacing:.5px;border-left:4px solid var(--primary);padding-left:12px}.footer-nav{display:flex;flex-direction:column;gap:2px}.footer-link{color:#B0BEC5;text-decoration:none;padding:8px 0;font-size:.95rem;transition:color .3s ease;border-bottom:1px solid transparent;letter-spacing:.3px}.footer-link:hover{color:#6FA3FF;transform:translateX(4px);border-bottom-color:rgba(111,163,255,.3)}.footer-copyright{border-top:1px solid rgba(255,255,255,.12);background-color:rgba(0,0,0,.15);padding:25px 0;text-align:center;position:relative;overflow:hidden}.footer-copyright p{max-width:1200px;margin:0 auto;color:#94A3B8;font-size:.9rem;padding:0 20px;letter-spacing:.3px}.footer-copyright p span{color:#6FA3FF;font-weight:700}.footer-copyright::before{content:'';position:absolute;top:0;left:0;width:100%;height:2px;background:linear-gradient(90deg,transparent,#4A8BFF,transparent)}.page-content{max-width:1200px;margin:0 auto;padding:20px;width:100%;overflow-x:hidden}.page-content img{max-width:100%;height:auto;display:block}@media(max-width:768px){body{padding-top:110px}.site-header{display:block}.header-top{position:relative;z-index:200}.header-container{width:100%;max-width:none;padding:12px 12px;display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}.header-top{background-color:var(--nav-bg)}.header-container{min-height:60px;flex-wrap:nowrap}.hamburger-menu{display:flex;width:40px;height:40px;flex-direction:column;justify-content:center;align-items:center;gap:5px;cursor:pointer;background:transparent;border:none;order:0;padding:8px;z-index:2002;flex-shrink:0;position:relative}.hamburger-menu span{display:block;width:100%;height:3px;background:#fff;border-radius:3px;transition:all .3s ease-in-out;transform-origin:center}.hamburger-menu.active span:nth-child(1){transform:translateY(8px) rotate(45deg)}.hamburger-menu.active span:nth-child(2){opacity:0;transform:translateX(-50%)}.hamburger-menu.active span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}.logo{order:1;font-size:1.4rem;color:#fff;-webkit-text-fill-color:#fff;flex:1;text-align:center;padding:0;min-width:auto}.desktop-nav-buttons{display:none}.main-nav{display:none;position:fixed;top:0;left:0;width:82%;height:100vh;height:100dvh;background:linear-gradient(135deg,#0F2B5B 0%,#1B4FD8 100%);flex-direction:column;align-items:flex-start;justify-content:flex-start;overflow-y:auto;z-index:1001;padding:80px 20px 30px;transform:translateX(-100%);transition:transform .3s ease-in-out;border-top:none;box-shadow:4px 0 20px rgba(0,0,0,.2)}.main-nav.active{display:flex;transform:translateX(0)}.nav-container{width:100%;max-width:none;flex-direction:column;align-items:flex-start;padding:0;display:flex}.nav-link{display:block;color:#E0E7FF;text-decoration:none;font-size:1.1rem;padding:14px 8px;border-bottom:1px solid rgba(255,255,255,.15);width:100%;transition:background .2s ease,padding .2s ease;position:relative}.nav-link:hover{background:rgba(255,255,255,.1);padding-left:16px;color:#fff;border-bottom-color:transparent}.nav-link.active{background:rgba(255,255,255,.1);color:#6FA3FF;border-bottom-color:transparent}.mobile-menu-overlay{position:fixed;top:0;left:0;width:100%;height:100%;height:100dvh;background:rgba(0,0,0,.55);z-index:1000;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease;backdrop-filter:blur(2px)}.mobile-menu-overlay.active{opacity:1;visibility:visible}.mobile-nav-buttons{display:flex;padding:10px 12px;gap:10px;background:var(--nav-bg);justify-content:center;align-items:center;width:100%;z-index:199;flex-wrap:nowrap;border-top:1px solid rgba(255,255,255,.1)}.mobile-nav-buttons .btn{flex:1;padding:10px 8px;font-size:.85rem;text-align:center;min-height:40px;margin:0;border-radius:6px}.site-footer .footer-container{grid-template-columns:1fr;padding:40px 20px 30px;gap:30px}.footer-heading{margin-bottom:10px;font-size:1rem}.footer-logo{font-size:1.3rem}.footer-nav{display:grid;grid-template-columns:repeat(2,1fr);gap:0}.footer-link{padding:8px 0;font-size:.9rem}.footer-copyright p{font-size:.8rem}.page-content{padding:12px;box-sizing:border-box}.page-content img{max-width:100%!important;height:auto!important;display:block}.page-content{overflow-x:hidden;max-width:100%}body{overflow-x:hidden}.site-header .header-top .header-container .logo{-webkit-text-fill-color:#fff}.btn{letter-spacing:.2px;font-size:.8rem;padding:10px 18px}}
/* 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;
}