:root{--color-bg-primary: #0a0e27;--color-bg-secondary: #0d1137;--color-bg-tertiary: #060a1f;--color-accent: #00d4ff;--color-accent-dark: #0099cc;--color-text-primary: rgba(255, 255, 255, .85);--color-text-secondary: rgba(255, 255, 255, .5);--color-text-muted: rgba(255, 255, 255, .3);--color-border: rgba(0, 212, 255, .15);--color-border-hover: rgba(0, 212, 255, .3);--color-card-bg: rgba(255, 255, 255, .03);--color-card-hover: rgba(255, 255, 255, .06);--font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;--font-en: "Inter", "Roboto", sans-serif;--font-family: var(--font-cn), var(--font-en);--max-width: 1200px;--section-gap: 80px;--card-gap: 20px;--radius: 4px;--breakpoint-tablet: 768px;--breakpoint-mobile: 480px}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-family);color:var(--color-text-primary);background-color:var(--color-bg-primary);line-height:1.7;overflow-x:hidden}a{color:inherit;text-decoration:none}ul,ol{list-style:none}img{max-width:100%;height:auto;display:block}button{border:none;background:none;cursor:pointer;font-family:inherit;color:inherit}input,textarea{font-family:inherit;font-size:inherit}.fade-in{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}.fade-in.visible{opacity:1;transform:translateY(0)}.fade-in-delay-1{transition-delay:.1s}.fade-in-delay-2{transition-delay:.2s}.fade-in-delay-3{transition-delay:.3s}.fade-in-delay-4{transition-delay:.4s}@keyframes gradient-shift{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}@keyframes pulse-glow{0%,to{box-shadow:0 0 20px #00d4ff1a}50%{box-shadow:0 0 30px #00d4ff33}}.container{max-width:var(--max-width);margin:0 auto;padding:0 40px}.section{padding:var(--section-gap) 0}.section-title{font-size:28px;font-weight:600;text-align:center;margin-bottom:16px;letter-spacing:2px}.section-subtitle{font-size:15px;color:var(--color-text-secondary);text-align:center;margin-bottom:48px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 32px;border-radius:var(--radius);font-size:15px;font-weight:500;transition:all .3s ease;cursor:pointer}.btn-primary{background:linear-gradient(135deg,var(--color-accent),var(--color-accent-dark));color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px #00d4ff4d}.btn-outline{border:1px solid var(--color-border-hover);color:var(--color-accent);background:transparent}.btn-outline:hover{background:#00d4ff1a;border-color:var(--color-accent);transform:translateY(-2px)}.card{background:var(--color-card-bg);border:1px solid var(--color-border);border-radius:var(--radius);padding:32px;transition:all .3s ease}.card:hover{border-color:var(--color-border-hover);background:var(--color-card-hover);transform:translateY(-4px)}.card-icon{width:48px;height:48px;margin-bottom:20px;color:var(--color-accent)}.card-icon svg{width:100%;height:100%}.card-title{font-size:18px;font-weight:600;margin-bottom:12px}.card-desc{font-size:14px;color:var(--color-text-secondary);line-height:1.7}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--card-gap)}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--card-gap)}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--card-gap)}.nav{position:fixed;top:0;left:0;right:0;z-index:1000;padding:16px 0;transition:all .3s ease}.nav.scrolled{background:#0a0e27f2;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);padding:12px 0;border-bottom:1px solid var(--color-border)}.nav-inner{display:flex;align-items:center;justify-content:space-between}.nav-logo{font-size:20px;font-weight:700;color:var(--color-accent);letter-spacing:2px}.nav-links{display:flex;gap:32px}.nav-link{font-size:14px;color:var(--color-text-secondary);transition:color .3s;position:relative}.nav-link:hover,.nav-link.active{color:var(--color-accent)}.nav-link.active:after{content:"";position:absolute;bottom:-4px;left:0;right:0;height:2px;background:var(--color-accent);border-radius:1px}.nav-hamburger{display:none;flex-direction:column;gap:5px;width:24px;cursor:pointer;background:none;border:none;padding:0}.nav-hamburger span{display:block;width:100%;height:2px;background:var(--color-text-primary);transition:all .3s;border-radius:1px}.nav-hamburger.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.nav-hamburger.open span:nth-child(2){opacity:0}.nav-hamburger.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}.nav-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:999}.nav-overlay.open{display:block}.footer{background:var(--color-bg-tertiary);padding:64px 0 0;border-top:1px solid var(--color-border)}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px}.footer-title{font-size:16px;font-weight:600;margin-bottom:20px;color:var(--color-accent)}.footer-desc{font-size:14px;color:var(--color-text-secondary);line-height:1.8}.footer-links li{margin-bottom:12px}.footer-links a{font-size:14px;color:var(--color-text-secondary);transition:color .3s}.footer-links a:hover{color:var(--color-accent)}.footer-contact li{display:flex;align-items:center;gap:10px;margin-bottom:12px;font-size:14px;color:var(--color-text-secondary)}.footer-contact svg{flex-shrink:0;color:var(--color-accent)}.footer-bottom{margin-top:48px;padding:24px 0;border-top:1px solid var(--color-border);text-align:center;font-size:13px;color:var(--color-text-muted)}.footer-bottom p+p{margin-top:4px}.page-banner{position:relative;padding:140px 0 60px;background:linear-gradient(135deg,var(--color-bg-primary),var(--color-bg-secondary));overflow:hidden}.page-banner-canvas{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;pointer-events:none}.page-banner-content{position:relative;text-align:center}.page-banner-title{font-size:36px;font-weight:700;margin-bottom:12px;letter-spacing:4px}.page-banner-subtitle{font-size:15px;color:var(--color-text-secondary);letter-spacing:4px;text-transform:uppercase}.back-to-top{position:fixed;bottom:40px;right:40px;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--color-accent),var(--color-accent-dark));color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transition:all .3s ease;z-index:999;border:none}.back-to-top.show{opacity:1;visibility:visible}.back-to-top:hover{transform:translateY(-4px);box-shadow:0 8px 24px #00d4ff4d}@media(max-width:768px){.container{padding:0 20px}.section{padding:48px 0}.section-title{font-size:24px}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.nav-links{position:fixed;top:0;right:-280px;width:280px;height:100vh;background:var(--color-bg-secondary);flex-direction:column;padding:80px 32px 32px;gap:24px;transition:right .3s ease;z-index:1000;border-left:1px solid var(--color-border)}.nav-links.open{right:0}.nav-hamburger{display:flex}.footer-grid{grid-template-columns:1fr;gap:32px}.page-banner-title{font-size:28px}}@media(max-width:480px){.section-title{font-size:20px}.btn{padding:10px 24px;font-size:14px}.card{padding:24px}}