:root{--a1:#FFFFFF;--a2:#737373;--fg:#F5F5F5;--fg2:#A3A3A3;}
*,*::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:#1A1A1A;color:#F5F5F5;}
.nav{position:sticky;top:0;z-index:50;background:#1A1A1AE6;backdrop-filter:blur(12px);border-bottom:1px solid #404040;}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;}
.logo{font-weight:700;font-size:16px;color:#F5F5F5;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:#A3A3A3;text-decoration:none;font-size:14px;transition:color .2s;}.nav-links a:hover{color:#FFFFFF;}.nav-cta{padding:8px 20px;background:linear-gradient(135deg,#FFFFFF,#737373);border-radius:6px;color:#fff;font-weight:600;font-size:14px;text-decoration:none;}
.hero{padding:clamp(60px,8vw,120px) 0 clamp(40px,5vw,80px);}
.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,5vw,60px);align-items:center;}
.hero h1{font-size:clamp(26px,4vw,48px);font-weight:800;line-height:1.15;margin-bottom:20px;}
.hero p{font-size:clamp(14px,1.5vw,16px);color:#A3A3A3;margin-bottom:28px;}
.hero .kpi-row{display:flex;gap:12px;margin-bottom:28px;}
.hero .kpi{padding:12px 16px;background:#262626;border:1px solid #404040;border-radius:10px;}
.hero .kpi .num{font-size:18px;font-weight:700;color:#FFFFFF;}
.hero .kpi .lbl{font-size:11px;color:#A3A3A3;}
.hero-banner{border-radius:10px;overflow:hidden;position:relative;}
.hero-banner::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,transparent,rgba(0,0,0,.2));pointer-events:none;}
@media(max-width:768px){.hero-inner{grid-template-columns:1fr;}}
.strip{background:#262626;padding:16px 0;}
.strip-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;}
.strip-item{text-align:center;padding:12px;background:transparent;}
.s-name{font-size:11px;color:#A3A3A3;letter-spacing:1px;text-transform:uppercase;}
.s-price{font-family:"SF Mono",Consolas,monospace;font-size:22px;font-weight:800;color:#FFFFFF;margin:4px 0;}
.s-chg{font-size:11px;color:#737373;}
.features{padding:clamp(60px,7vw,100px) 0;}
.features h2{font-size:clamp(22px,3vw,34px);font-weight:700;text-align:center;margin-bottom:40px;}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid #404040;border-bottom:1px solid #404040;}
.feature-card{padding:24px 16px;text-align:center;border-left:1px solid #404040;border-right:1px solid #404040;margin-right:-1px;margin-left:-1px;}
.feature-card .f-ic{font-size:26px;margin-bottom:10px;color:#FFFFFF;}
.feature-card h3{font-size:14px;font-weight:600;margin-bottom:4px;color:#F5F5F5;}
.feature-card p{font-size:12px;color:#A3A3A3;line-height:1.6;}
@media(max-width:600px){.feature-grid{grid-template-columns:1fr 1fr;}}
.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:#A3A3A3;margin-bottom:40px;font-size:14px;}
.dl-grid{display:grid;grid-template-columns:1fr 1fr auto;gap:16px;align-items:stretch;max-width:800px;margin:0 auto;}
.dl-card{padding:24px;background:#262626;border:1px solid #404040;border-radius:10px;}
.dl-card h3{font-size:14px;font-weight:600;margin-bottom:4px;}
.dl-sub{font-size:11px;color:#A3A3A3;margin-bottom:10px;}.dl-btn:not([hidden]){display:block;padding:8px 18px;background:#FFFFFF;color:#fff;border-radius:6px;font-weight:600;font-size:12px;text-decoration:none;text-align:center;}
.dl-side{padding:24px;background:transparent;display:flex;flex-direction:column;gap:10px;justify-content:center;}
@media(max-width:600px){.dl-grid{grid-template-columns:1fr;}}
.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 #404040;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:#F5F5F5;}
.faq-item summary::after{content:"+";color:#FFFFFF;font-size:18px;font-family:"SF Mono",Consolas,monospace;}
.faq-item[open] summary::after{content:"−";}
.faq-item p{margin-top:12px;color:#A3A3A3;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:10px;}
.screen-grid img{max-height:480px;width:auto;object-fit:contain;margin:0 auto;border-radius:10px;}
.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}