:root{--a1:#2196F3;--a2:#00BCD4;--fg:#E3F2FD;--fg2:#64B5F6;}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;line-height:1.6;overflow-x:hidden;}
a{text-decoration:none;color:inherit;}
img{max-width:100%;height:auto;display:block;}
.container{max-width:1200px;margin:0 auto;padding:0 clamp(16px,3vw,24px);}
body{background:#020D1F;color:#E3F2FD;}
.nav{position:sticky;top:0;z-index:50;background:#020D1FE6;backdrop-filter:blur(12px);border-bottom:1px solid #0A2540;}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;}
.logo{font-weight:700;font-size:16px;color:#E3F2FD;text-decoration:none;display:flex;align-items:center;gap:10px;}
.logo img{height:28px;filter:brightness(0) invert(1);}.nav-links{display:flex;gap:24px;}.nav-links a{color:#64B5F6;text-decoration:none;font-size:14px;transition:color .2s;}.nav-links a:hover{color:#2196F3;}.nav-cta{padding:8px 20px;background:linear-gradient(135deg,#2196F3,#00BCD4);border-radius:22px;color:#fff;font-weight:600;font-size:14px;text-decoration:none;}
.hero{padding:clamp(60px,8vw,120px) 0 clamp(40px,5vw,80px);text-align:center;position:relative;overflow:hidden;}
.hero::before{content:"";position:absolute;top:50%;left:50%;width:600px;height:600px;transform:translate(-50%,-50%);background:radial-gradient(circle,#2196F320,transparent 60%);border-radius:50%;pointer-events:none;}
.hero-inner{position:relative;z-index:1;}
.hero h1{font-size:clamp(30px,5vw,56px);font-weight:800;line-height:1.1;margin-bottom:18px;background:linear-gradient(135deg,#2196F3,#00BCD4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
.hero p{font-size:clamp(14px,1.5vw,17px);color:#64B5F6;max-width:540px;margin:0 auto 28px;}
.hero .kpi-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}
.hero .kpi{padding:14px 20px;background:rgba(255,255,255,.05);border:1px solid #0A2540;border-radius:20px;backdrop-filter:blur(8px);}
.hero .kpi .num{font-size:20px;font-weight:700;color:#2196F3;}
.hero .kpi .lbl{font-size:11px;color:#64B5F6;}
.strip{background:#05162B;padding:10px 0;border-top:1px solid #0A2540;border-bottom:1px solid #0A2540;}
.strip-grid{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:0;}
.strip-item{padding:10px 18px;border-right:1px solid #0A2540;display:flex;align-items:center;gap:10px;}
.strip-item:last-child{border-right:none;}
.s-name{font-size:12px;color:#64B5F6;}
.s-price{font-family:"SF Mono",Consolas,monospace;font-size:14px;font-weight:700;}
.s-chg{font-size:11px;color:#00BCD4;}
.features{padding:clamp(60px,7vw,100px) 0;background:#05162B;}
.features h2{font-size:clamp(22px,3vw,34px);font-weight:700;text-align:center;margin-bottom:40px;}
.spec-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:1px;background:#0A2540;border-radius:20px;overflow:hidden;}
.spec-item{background:#05162B;padding:20px;text-align:center;}
.spec-item .sp-lbl{font-size:10px;color:#64B5F6;letter-spacing:1px;text-transform:uppercase;}
.spec-item .sp-val{font-size:20px;font-weight:700;color:#2196F3;font-family:"SF Mono",Consolas,monospace;margin-top:6px;}
.download{padding:clamp(60px,8vw,100px) 0;}
.download h2{font-size:clamp(22px,3vw,34px);font-weight:700;text-align:center;margin-bottom:8px;}
.download .sub{text-align:center;color:#64B5F6;margin-bottom:40px;font-size:14px;}
.dl-grid{display:flex;flex-direction:column;gap:10px;max-width:400px;margin:0 auto;}.dl-btn-row:not([hidden]){display:flex;align-items:center;gap:14px;padding:16px 24px;background:#05162B;border:1px solid #0A2540;border-radius:20px;text-decoration:none;color:inherit;}
.dl-btn-row .dl-ic{font-size:22px;}
.dl-btn-row h3{font-size:14px;font-weight:600;}
.dl-btn-row .dl-sub{font-size:11px;color:#64B5F6;}
.dl-btn-row .arrow{margin-left:auto;color:#2196F3;font-size:18px;}
.faq{padding:clamp(60px,7vw,80px) 0;}
.faq h2{font-size:clamp(22px,3vw,30px);font-weight:700;text-align:center;margin-bottom:40px;}
.faq-item{border-bottom:1px solid #0A2540;padding:16px 0;}
.faq-item summary{cursor:pointer;font-weight:600;font-size:15px;list-style:none;display:flex;justify-content:space-between;align-items:center;color:#E3F2FD;}
.faq-item summary::after{content:"+";color:#2196F3;font-size:18px;font-family:"SF Mono",Consolas,monospace;}
.faq-item[open] summary::after{content:"−";}
.faq-item p{margin-top:12px;color:#64B5F6;font-size:13px;line-height:1.7;}
.ft{background:#000;color:#888;padding:40px 0 20px;text-align:center;font-size:13px;}
.ft img{height:24px;margin-bottom:14px;opacity:.4;}
/* === 图片大小约束 === */
img{max-width:100%;height:auto;display:block;}
.hero-banner img{max-height:420px;width:100%;object-fit:contain;border-radius:20px;}
.screen-grid img{max-height:480px;width:auto;object-fit:contain;margin:0 auto;border-radius:20px;}
.logo img,.ft img{max-height:28px;width:auto;}
@media(max-width:768px){.hero-banner img{max-height:260px;}.screen-grid img{max-height:360px;}.nav-links{display:none;}}
a.dl-card{color:inherit;text-decoration:none}