:root{--bg-dark:#0a1628;--bg-darker:#060f1d;--bg-card:#0d1f35;--bg-card-hover:#112640;--cyan:#00d4ff;--cyan-dark:#00a8cc;--cyan-glow:rgba(0,212,255,0.3);--cyan-subtle:rgba(0,212,255,0.1);--text:#fff;--text-muted:#8ba3c7;--text-dim:#5a7a9a;--border:rgba(0,212,255,0.15);--gradient:linear-gradient(135deg,#00d4ff 0%,#00a8cc 100%)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter','Noto Sans SC',sans-serif;background:var(--bg-dark);color:var(--text);line-height:1.7;overflow-x:hidden}
.lang-en{display:block}.lang-zh{display:none}
body.zh .lang-en{display:none}body.zh .lang-zh{display:block}
span.lang-en,span.lang-zh{display:inline}
body.zh span.lang-en{display:none}body:not(.zh) span.lang-zh{display:none}
.container{max-width:1280px;margin:0 auto;padding:0 24px}
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;padding:16px 0;transition:all .4s ease;background:rgba(6,15,29,0.8);backdrop-filter:blur(20px);border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(6,15,29,0.95);border-bottom:1px solid var(--border);padding:12px 0}
.nav-inner{display:flex;justify-content:space-between;align-items:center}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none}
.logo img{height:50px;width:auto}
.nav-menu{display:flex;gap:32px;list-style:none}
.nav-menu a{color:var(--text-muted);text-decoration:none;font-weight:500;font-size:14px;transition:all .3s ease;position:relative;padding:8px 0}
.nav-menu a::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:2px;background:var(--cyan);transition:width .3s ease}
.nav-menu a:hover,.nav-menu a.active{color:var(--cyan)}
.nav-menu a:hover::after,.nav-menu a.active::after{width:100%}
.nav-right{display:flex;align-items:center;gap:20px}
.lang-switch{display:flex;background:var(--bg-card);border-radius:8px;overflow:hidden;border:1px solid var(--border)}
.lang-btn{padding:8px 14px;background:transparent;border:none;color:var(--text-muted);font-size:12px;font-weight:600;cursor:pointer;transition:all .3s ease}
.lang-btn.active{background:var(--cyan);color:var(--bg-dark)}
.mobile-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px;z-index:1001}
.mobile-toggle span{width:24px;height:2px;background:var(--text);transition:all .3s ease;display:block}
.mobile-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.mobile-toggle.active span:nth-child(2){opacity:0}
.mobile-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
.page-header{padding:160px 0 80px;background:var(--bg-darker);position:relative;overflow:hidden}
.page-header::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(ellipse at 20% 50%,rgba(0,212,255,0.08) 0%,transparent 50%),radial-gradient(ellipse at 80% 50%,rgba(0,168,204,0.05) 0%,transparent 50%)}
.page-header-content{position:relative;z-index:10;text-align:center}
.page-header h1{font-family:'Rajdhani',sans-serif;font-size:clamp(36px,6vw,56px);font-weight:700;margin-bottom:16px}
.page-header h1 .highlight{color:var(--cyan)}
.page-header p{font-size:18px;color:var(--text-muted);max-width:600px;margin:0 auto}
section{padding:100px 0;position:relative}
.section-header{text-align:center;max-width:700px;margin:0 auto 64px}
.section-tag{display:inline-block;padding:8px 18px;background:var(--cyan-subtle);border:1px solid var(--border);border-radius:100px;margin-bottom:20px;font-size:11px;font-weight:700;color:var(--cyan);letter-spacing:2px;text-transform:uppercase}
.section-title{font-family:'Rajdhani',sans-serif;font-size:clamp(32px,5vw,44px);font-weight:700;margin-bottom:16px;line-height:1.2}
.section-title .highlight{color:var(--cyan)}
.section-desc{font-size:17px;color:var(--text-muted);line-height:1.8}
.bg-darker{background:var(--bg-darker)}.bg-dark{background:var(--bg-dark)}
.btn{display:inline-flex;align-items:center;gap:10px;padding:16px 32px;font-size:14px;font-weight:600;text-decoration:none;border-radius:10px;transition:all .3s ease;cursor:pointer;border:none}
.btn-primary{background:var(--gradient);color:var(--bg-dark)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 15px 40px var(--cyan-glow)}
.btn-outline{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-outline:hover{border-color:var(--cyan);color:var(--cyan)}
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:36px;transition:all .4s ease}
.card:hover{transform:translateY(-6px);border-color:var(--cyan)}
.footer{background:var(--bg-darker);border-top:1px solid var(--border);padding:48px 0 24px}
.footer-content{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:24px}
.footer-logo img{height:40px}
.footer-links{display:flex;gap:32px;flex-wrap:wrap}
.footer-links a{color:var(--text-muted);text-decoration:none;font-size:14px;transition:color .3s ease}
.footer-links a:hover{color:var(--cyan)}
.footer-bottom{margin-top:32px;padding-top:24px;border-top:1px solid var(--border);text-align:center}
.copyright{color:var(--text-dim);font-size:13px}
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
.animate{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.animate.visible{opacity:1;transform:translateY(0)}
@media(max-width:1024px){.page-header{padding:140px 0 60px}}
@media(max-width:768px){.nav-menu{position:fixed;top:0;left:0;right:0;bottom:0;background:var(--bg-darker);flex-direction:column;justify-content:center;align-items:center;gap:32px;opacity:0;visibility:hidden;transition:all .3s ease}.nav-menu.active{opacity:1;visibility:visible}.nav-menu a{font-size:24px}.mobile-toggle{display:flex}.footer-content{flex-direction:column;text-align:center}section{padding:80px 0}.page-header{padding:120px 0 50px}}