:root{--primary:#26A9E0;--primary-dark:#1a8bbd;--primary-light:#e0f3fb;--white:#FFFFFF;--black:#000000;--login:#EA7C07;--register:linear-gradient(135deg,#26A9E0,#1a8bbd);--header-offset:120px;--text-main:#333333;--text-light:#666666;--border-light:#e8e8e8;--shadow-sm:0 2px 8px rgba(0,0,0,0.08);--shadow-md:0 4px 20px rgba(0,0,0,0.1);--shadow-lg:0 8px 30px rgba(0,0,0,0.15)}*{box-sizing:border-box;margin:0;padding:0}body{padding-top:var(--header-offset);font-family:'Segoe UI',Roboto,Helvetica,Arial,sans-serif;background:#FFFFFF;color:var(--text-main);overflow-x:hidden}.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:var(--white);box-shadow:var(--shadow-md);border-bottom:2px solid var(--primary)}.header-top{background:var(--primary);width:100%;min-height:68px}.header-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;min-height:68px;padding:0 30px}.logo{display:block;font-size:32px;font-weight:900;color:var(--white);text-decoration:none;letter-spacing:1px;line-height:1.2;text-shadow:0 2px 4px rgba(0,0,0,0.15);padding:8px 0;flex-shrink:0}.desktop-nav-buttons{display:flex;align-items:center;gap:12px;padding:8px 0;flex-shrink:0}.btn{display:inline-block;padding:10px 24px;border-radius:50px;text-decoration:none;font-weight:700;font-size:15px;text-align:center;transition:transform 0.3s ease,box-shadow 0.3s ease;white-space:nowrap;flex-shrink:0;line-height:1.4}.btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,0.2)}.btn-login{background:var(--login);color:var(--white);border:2px solid rgba(255,255,255,0.3)}.btn-login:hover{background:#d47006;color:var(--white)}.btn-register{background:var(--register);color:var(--white);border:2px solid rgba(255,255,255,0.3)}.btn-register:hover{background:linear-gradient(135deg,#1a8bbd,#1580a8);color:var(--white)}.main-nav{background:var(--white);width:100%;display:flex;position:static;transform:none;box-shadow:inset 0 0 0 1px rgba(38,169,224,0.15)}.nav-container{max-width:1200px;margin:0 auto;display:flex;flex-direction:row;justify-content:center;align-items:center;width:100%;padding:0 20px}.nav-link{display:block;padding:13px 18px;text-decoration:none;color:var(--text-main);font-size:15px;font-weight:600;transition:color 0.3s ease,background 0.3s ease;border-bottom:3px solid transparent;white-space:nowrap}.nav-link:hover{color:var(--primary);background:var(--primary-light);border-bottom-color:var(--primary)}.hamburger-menu,.mobile-menu-overlay,.mobile-nav-buttons{display:none}@media(max-width:768px){:root{--header-offset:110px}.site-header{background:var(--white)}.header-top{background:var(--primary);min-height:60px}.header-container{width:100%;max-width:none;min-height:60px;padding:0 15px;display:flex;justify-content:space-between;align-items:center;position:relative}.logo{font-size:26px;position:absolute;left:50%;transform:translateX(-50%);padding:4px 0;color:var(--white)}.desktop-nav-buttons{display:none}.hamburger-menu{display:flex;flex-direction:column;justify-content:center;align-items:center;width:44px;height:44px;cursor:pointer;background:transparent;border:none;padding:0;z-index:1002;margin-left:0}.hamburger-menu span{display:block;width:26px;height:3px;background:var(--white);border-radius:3px;margin:3px 0;transition:all 0.3s ease}.hamburger-menu.active span:nth-child(1){transform:translateY(9px) rotate(45deg)}.hamburger-menu.active span:nth-child(2){opacity:0}.hamburger-menu.active span:nth-child(3){transform:translateY(-9px) rotate(-45deg)}.mobile-menu-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.5);z-index:990;cursor:pointer;opacity:0;transition:opacity 0.3s ease}.mobile-menu-overlay.visible{display:block;opacity:1}.mobile-nav-buttons{display:flex;justify-content:center;align-items:center;background:var(--white);gap:10px;padding:10px 0;min-height:48px;border-bottom:1px solid rgba(38,169,224,0.2)}.main-nav{display:none;flex-direction:column;position:fixed;top:0;left:0;width:280px;height:100vh;height:100dvh;background:var(--white);box-shadow:var(--shadow-lg);z-index:1001;transform:translateX(-100%);transition:transform 0.3s ease;overflow-y:auto}.main-nav.active{display:flex;transform:translateX(0)}.nav-container{width:100%;max-width:none;flex-direction:column;justify-content:flex-start;align-items:stretch;padding:80px 0 20px;height:100%}.nav-link{display:block;padding:15px 24px;font-size:16px;border-bottom:1px solid var(--border-light);border-left:4px solid transparent}.nav-link:hover{background:var(--primary-light);border-left-color:var(--primary);color:var(--primary)}.page-content img{max-width:100% !important;height:auto !important;display:block}.page-content{overflow-x:hidden;max-width:100%}body{overflow-x:hidden}.header-container,.nav-container{max-width:none}.main-nav.active{display:flex !important}.mobile-menu-overlay.visible{display:block}.btn{padding:9px 20px;font-size:14px}.mobile-nav-buttons .btn{display:inline-block}.footer-container{flex-direction:column;gap:20px}.footer-column{width:100%;text-align:center}.footer-nav{border-bottom:1px solid var(--border-light);padding-bottom:10px}.site-header{border-bottom:1px solid var(--primary)}}
/* 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;
}