:root{--primary-blue:#1a6dfc;--secondary-blue:#4d8df8;--light-blue:#e8f1ff;--dark-blue:#0a4cb3;--text-color:#333;--light-gray:#f5f5f5;--white:#ffffff;--border-radius:8px;--box-shadow:0 5px 15px rgba(0, 0, 0, 0.08);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif}body{color:var(--text-color);line-height:1.6;background-color:var(--white);overflow-x:hidden;font-size:clamp(.8rem, 2vw, 1rem)}body.menu-open{overflow:hidden}.container{width:90%;max-width:1200px;margin:0 auto}.section{padding:80px 0}.section-title{text-align:center;margin-bottom:50px;color:var(--dark-blue);font-size:clamp(1.2rem, 2vw, 2.2rem);font-weight:700}.section-subtitle{text-align:center;margin-bottom:30px;color:var(--text-color);font-size:clamp(.8rem, 2vw, 1rem);max-width:700px;margin-left:auto;margin-right:auto}.btn{display:inline-block;background-color:var(--primary-blue);color:#fff;padding:12px 30px;border-radius:var(--border-radius);text-decoration:none;font-weight:600;transition:.3s;border:none;cursor:pointer;font-size:clamp(.8rem, 2vw, 1rem)}.btn:hover{background-color:var(--dark-blue);transform:translateY(-2px);box-shadow:0 5px 15px rgba(26,109,252,.3)}.loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:var(--primary-blue);display:flex;flex-direction:column;justify-content:center;align-items:center;z-index:9999;transition:opacity .3s,visibility .3s}.loading-overlay.hidden{opacity:0;visibility:hidden}.loader{width:70px;height:70px;border:5px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:#fff;animation:1s ease-in-out infinite spin;margin-bottom:20px}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{color:#fff;font-size:1.2rem;font-weight:600}header{background-color:var(--white);box-shadow:0 2px 10px rgba(0,0,0,.1);position:sticky;top:0;z-index:1000}.navbar{display:flex;justify-content:space-between;align-items:center;padding:20px 0;position:relative}.logo{font-size:clamp(1.2rem, 2vw, 1.8rem);font-weight:700;color:var(--primary-blue);text-decoration:none;display:flex;align-items:center;z-index:1002}.logo i{margin-right:10px;font-size:2rem}.nav-links{display:flex;list-style:none}.nav-links>li{margin-left:30px;position:relative}.nav-links>li>a{text-decoration:none;color:var(--text-color);font-weight:500;transition:color .3s;padding:10px 15px;border-radius:var(--border-radius);display:block;font-size:clamp(.8rem, 2vw, 1rem)}.nav-links>li>a.active,.nav-links>li>a:hover{background-color:var(--primary-blue);color:#fff}.dropdown-menu{position:absolute;top:100%;left:0;background-color:var(--white);min-width:220px;box-shadow:var(--box-shadow);border-radius:var(--border-radius);opacity:0;visibility:hidden;transform:translateY(10px);transition:.3s;z-index:1000}.nav-links>li:hover .dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-menu li{list-style:none}.dropdown-menu a{display:block;padding:12px 20px;text-decoration:none;color:var(--text-color);transition:.3s;border-bottom:1px solid var(--light-gray);font-size:clamp(.8rem, 2vw, 1rem)}.dropdown-menu a:hover{background-color:var(--light-blue);color:var(--primary-blue)}.dropdown-menu li:last-child a{border-bottom:none}.mobile-menu-btn{display:none;background:0 0;border:none;font-size:1.5rem;color:var(--primary-blue);cursor:pointer;z-index:999}.mobile-menu-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.5);z-index:999}.mobile-menu-overlay.active{display:block}.dropdown-toggle,.mobile-close-btn{display:none}footer{background-color:#1a1a2e;color:var(--white);padding:70px 0 20px;font-size:clamp(.8rem, 2vw, 1rem)}.footer-content{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-bottom:50px}.footer-section h3{margin-bottom:20px;color:var(--white);font-size:clamp(.8rem, 2vw, 1.3rem)}.footer-links{list-style:none}.footer-links li{margin-bottom:10px}.footer-links a{color:#b0b0b0;text-decoration:none;transition:color .3s}.footer-links a:hover{color:var(--white)}.contact-info p{margin-bottom:10px;color:#b0b0b0}.contact-form input,.contact-form textarea{width:100%;padding:12px;margin-bottom:15px;border-radius:var(--border-radius);border:1px solid #444;background-color:#2d3047;color:var(--white)}.contact-form textarea{height:100px;resize:vertical}.captcha-row{display:flex;gap:10px;margin-bottom:15px}.captcha-container{display:flex;gap:5px;width:160px;font-size:clamp(.8rem, 2vw, 1rem)}.captcha-code{flex:1;display:flex;align-items:center;justify-content:center;background-color:#f0f0f0;color:#333;font-weight:700;font-size:clamp(.8rem, 2vw, 1rem);letter-spacing:3px;border-radius:var(--border-radius);user-select:none;min-height:48px}.refresh-captcha{background-color:var(--primary-blue);color:#fff;border:none;border-radius:var(--border-radius);padding:0 12px;cursor:pointer;transition:background-color .3s;display:flex;align-items:center;justify-content:center}.refresh-captcha:hover{background-color:var(--dark-blue)}#captcha-input{flex:1;margin-bottom:0}.social-icons{display:flex;gap:15px;margin-top:20px}.social-icon{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background-color:rgba(255,255,255,.1);border-radius:50%;color:#fff;text-decoration:none;transition:.3s}.social-icon:hover{background-color:var(--primary-blue);transform:translateY(-3px)}.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid #444;color:#b0b0b0}.keywords{text-align:center;margin-top:20px;font-size:clamp(.8rem, 2vw, 1rem);color:#b0b0b0}.floating-contact{position:fixed;right:20px;top:50%;transform:translateY(-50%);background:0 0;border-radius:var(--border-radius);padding:15px;box-shadow:none;z-index:999}.contact-icons{display:flex;flex-direction:column;gap:15px}.contact-icon{color:var(--white);font-size:1.2rem;display:flex;align-items:center;justify-content:center;width:50px;height:50px;background-color:var(--primary-blue);border-radius:50%;transition:.3s;position:relative;box-shadow:0 4px 8px rgba(26,109,252,.3)}.contact-icon:hover{background-color:var(--dark-blue);transform:scale(1.1)}.wechat-qr{position:absolute;left:-95px;top:-10px;width:80px;height:80px;background-color:#fff;border-radius:var(--border-radius);box-shadow:0 5px 15px rgba(0,0,0,.2);padding:10px;display:none;z-index:1001}.wechat-icon.active .wechat-qr,.wechat-icon:hover .wechat-qr{display:block}.wechat-qr img{width:100%;height:100%;border-radius:5px}.wechat-qr::after{content:'';position:absolute;top:50%;right:-10px;transform:translateY(-50%);width:0;height:0;border-top:10px solid transparent;border-bottom:10px solid transparent;border-left:10px solid #fff}@media (max-width:768px){.navbar{flex-wrap:wrap}.nav-links{display:none;position:fixed;top:0;right:-100%;width:80%;max-width:300px;height:100vh;background-color:var(--white);flex-direction:column;margin-top:0;padding:80px 20px 20px;box-shadow:-5px 0 15px rgba(0,0,0,.1);transition:right .3s;overflow-y:auto;z-index:9999}.nav-links.active{display:flex;right:0}.nav-links>li{margin:0;width:100%}.nav-links>li>a{padding:15px;border-radius:0;border-bottom:1px solid var(--light-gray);display:flex;justify-content:space-between;align-items:center}.dropdown-menu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;width:100%;margin-top:0;max-height:0;overflow:hidden;transition:max-height .3s;background-color:var(--light-blue)}.dropdown-menu.active{max-height:500px}.dropdown-menu a{padding:12px 15px 12px 30px;border-bottom:1px solid rgba(0,0,0,.05)}.dropdown-toggle,.mobile-close-btn{display:block}.dropdown-toggle{display:flex;align-items:center;justify-content:center;width:30px;height:30px;background:0 0;border:none;font-size:1rem;color:var(--text-color);cursor:pointer;transition:transform .3s}.dropdown-toggle.active{transform:rotate(180deg)}.mobile-menu-btn{display:block}.mobile-close-btn{position:absolute;top:20px;right:20px;background:0 0;border:none;font-size:1.5rem;color:var(--primary-blue);cursor:pointer;z-index:9999}.footer-content{grid-template-columns:1fr}.floating-contact{position:fixed;right:auto;left:0;top:auto;bottom:0;width:100%;transform:none;background-color:transparent;padding:10px;box-shadow:none}.contact-icons{flex-direction:row;justify-content:space-around}.contact-icon{width:45px;height:45px;background-color:var(--primary-blue)}body{padding-bottom:70px}.captcha-row{flex-direction:column}.captcha-container{width:100%}#captcha-input{width:100%;margin-bottom:15px}.wechat-qr{left:200px;width:100px;height:100px;bottom:60px;top:auto}}@media (max-width:480px){.wechat-qr{left:-20px;width:90px;height:90px}.wechat-qr::after{content:'';position:absolute;top:100%;left:50%;transform:translateX(-50%);width:0;height:0;border-top:10px solid #fff;border-right:10px solid transparent;border-left:10px solid transparent;border-bottom:10px solid transparent}}