:root{--primary:#26A9E0;--primary-dark:#0f6b8f;--secondary:#FFFFFF;--header-offset:122px;--orange:#EA7C07;--text:#000000;--text-light:#333333;--bg-light:#f0f7fa;--btn-login-bg:#EA7C07;--btn-register-bg:#26A9E0;--nav-bg:#ffffff;--sticky-shadow:0 4px 12px rgba(0,0,0,.15)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Segoe UI',system-ui,-apple-system,sans-serif;background:#fff;color:var(--text);line-height:1.5;padding-top:var(--header-offset)}a{text-decoration:none;color:inherit}ul{list-style:none}.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:#fff;box-shadow:var(--sticky-shadow);font-family:'Segoe UI',system-ui,-apple-system,sans-serif;min-height:auto}.header-top{background:var(--primary);width:100%}.header-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;padding:10px 20px;gap:15px;min-height:52px}.logo{font-size:2rem;font-weight:800;color:#fff;text-transform:uppercase;letter-spacing:1px;line-height:1.2;display:inline-block;transition:transform .2s}.logo:hover{transform:scale(1.02);color:#f0f8ff}.desktop-nav-buttons{display:flex;gap:12px;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 28px;border-radius:50px;font-weight:700;font-size:1rem;line-height:1.2;color:#fff;border:2px solid transparent;cursor:pointer;transition:all .3s ease;text-decoration:none;box-shadow:0 4px 10px rgba(0,0,0,.15)}.btn:hover{transform:translateY(-2px);box-shadow:0 6px 15px rgba(0,0,0,.25)}.btn:focus-visible{outline:3px solid #fff;outline-offset:2px}.btn-login{background:var(--btn-login-bg);border-color:var(--btn-login-bg)}.btn-login:hover{background:#d97306;border-color:#d97306}.btn-register{background:var(--btn-register-bg);border-color:#fff}.btn-register:hover{background:var(--primary-dark);border-color:var(--primary-dark)}.main-nav{display:flex;flex-direction:row;background:var(--nav-bg);width:100%;border-bottom:3px solid var(--primary)}.nav-container{max-width:1200px;margin:0 auto;display:flex;flex-direction:row;justify-content:center;align-items:center;padding:0 20px;gap:0;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:thin;scrollbar-color:var(--primary) transparent}.avatar-container{display:flex;gap:0}.nav-link{display:block;padding:12px 16px;color:#333;font-weight:600;font-size:1rem;text-align:center;white-space:nowrap;position:relative;transition:color .3s,background .3s;border-bottom:4px solid transparent}.nav-link:hover{color:var(--primary)}.nav-link:hover::after{content:'';position:absolute;left:0;right:0;bottom:-4px;height:4px;background:var(--primary)}.nav-link.active{color:var(--primary);border-bottom-color:var(--primary)}.mobile-nav-buttons{display:none}.hamburger-menu{display:none}.mobile-menu-overlay{display:none}.site-footer{background:#0b2e3a;color:#eceff1;padding:40px 20px 20px;font-family:'Segoe UI',system-ui,-apple-system,sans-serif;line-height:1.6}.footer-container{max-width:1200px;margin:0 auto;display:flex;flex-wrap:wrap;gap:40px;justify-content:space-between}.footer-column{flex:1;min-width:250px;margin-bottom:20px}.footer-column h3{color:var(--primary);font-size:1.2rem;margin-bottom:20px;position:relative;padding-bottom:10px}.footer-column h3::after{content:'';position:absolute;left:0;bottom:0;width:40px;height:3px;background:var(--primary);border-radius:2px}.footer-logo{font-size:1.8rem;font-weight:800;color:#fff;margin-bottom:15px;display:inline-block;letter-spacing:1px}.footer-info p{color:#b0bec5;margin-top:15px;font-size:.95rem}.footer-nav ul,.footer-contact ul{display:flex;flex-direction:column;gap:10px}.footer-nav a,.footer-contact a{color:#b0bec5;font-size:.95rem;transition:color .3s,padding-left .3s}.footer-nav a:hover,.footer-contact a:hover{color:#fff;padding-left:5px}.footer-bottom{border-top:1px solid #1c5063;margin-top:30px;padding-top:20px;text-align:center;color:#819ca9;font-size:.85rem}.footer-bottom p:first-child{margin-bottom:5px}.footer-disclaimer{font-size:.85rem;color:#5d8a9b;letter-spacing:.5px}@media(max-width:768px){:root{--header-offset:110px}.header-container{width:100%;max-width:none;padding:8px 15px;min-height:48px;gap:10px}.logo{font-size:1.6rem}.desktop-nav-buttons{display:none}.main-nav{display:none;position:fixed;top:0;left:0;width:80%;max-width:320px;height:100vh;background:#fff;z-index:1002;flex-direction:column;align-items:stretch;justify-content:flex-start;padding:80px 0 40px;transform:translateX(-100%);transition:transform .3s ease-in-out;overflow-y:auto;box-shadow:2px 0 15px rgba(0,0,0,.3)}.main-nav .nav-link{padding:16px 20px;font-size:1.1rem;border-bottom:1px solid #f0f0f0;text-align:left;color:#333}.main-nav .nav-link:hover{background:var(--bg-light);color:var(--primary)}.main-nav .nav-link.active{background:var(--bg-light);color:var(--primary)}.main-nav.active{display:flex;transform:translateX(0)}.nav-container{width:100%;max-width:none;flex-direction:column;align-items:stretch;padding:0;overflow:visible;gap:0}.mobile-nav-buttons{display:flex;gap:10px;padding:8px 15px;background:var(--primary);border-bottom:1px solid #fff;justify-content:center;align-items:center;flex-wrap:wrap}.mobile-nav-buttons .btn{flex:1;min-width:120px;padding:10px 12px;font-size:.9rem;text-align:center}.mobile-nav-buttons .btn-login{margin-right:0}.hamburger-menu{display:flex;flex-direction:column;justify-content:center;gap:6px;width:48px;height:48px;background:none;border:none;cursor:pointer;position:absolute;top:10px;left:15px;z-index:1003;padding:10px;background:transparent}.hamburger-menu span{display:block;width:100%;height:3px;background:#fff;border-radius:3px;transition:all .3s ease}.hamburger-menu.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.hamburger-menu.active span:nth-child(2){opacity:0}.hamburger-menu.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}.mobile-menu-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.6);z-index:1001;opacity:0;visibility:hidden;transition:opacity .3s ease}.mobile-menu-overlay.active{opacity:1;visibility:visible}.mobile-nav-buttons .btn{text-decoration:none;border:none}.site-footer .footer-container{flex-direction:column;align-items:center;text-align:center}.footer-bottom p:first-child{font-size:1rem}}
/* 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;
}