:root{--a1:#4A90E2;--a2:#26A69A;--fg:#E0ECF7;--fg2:#7D9CB5;}
*,*::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:#0D1B2A;color:#E0ECF7;}
.nav{position:sticky;top:0;z-index:50;background:#0D1B2AE6;backdrop-filter:blur(12px);border-bottom:1px solid #2C3E50;}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px;}
.logo{font-weight:700;font-size:16px;color:#E0ECF7;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:#7D9CB5;text-decoration:none;font-size:14px;transition:color .2s;}.nav-links a:hover{color:#4A90E2;}.nav-cta{padding:8px 20px;background:linear-gradient(135deg,#4A90E2,#26A69A);border-radius:4px;color:#fff;font-weight:600;font-size:14px;text-decoration:none;}
.hero{padding:clamp(40px,6vw,80px) 0 clamp(30px,4vw,50px);}
.hero-inner{max-width:720px;}
.hero h1{font-size:clamp(24px,3.5vw,40px);font-weight:800;line-height:1.15;margin-bottom:14px;}
.hero p{font-size:clamp(14px,1.5vw,15px);color:#7D9CB5;margin-bottom:20px;}
.hero .kpi-row{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px;}
.hero .kpi{padding:8px 12px;background:#1B2838;border:1px solid #2C3E50;border-radius:4px;}
.hero .kpi .num{font-size:15px;font-weight:700;color:#4A90E2;}
.hero .kpi .lbl{font-size:10px;color:#7D9CB5;}
@media(max-width:768px){}
.strip{background:#1B2838;padding:14px 0;}
.strip-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;}
.strip-item{display:flex;align-items:center;gap:10px;padding:10px 14px;background:rgba(255,255,255,.03);border-radius:2px;border-left:3px solid #4A90E2;}
.s-dot{width:8px;height:8px;border-radius:50%;background:#4A90E2;flex-shrink:0;}
.s-name{font-size:12px;color:#7D9CB5;}
.s-price{font-family:"SF Mono",Consolas,monospace;font-size:14px;font-weight:600;margin-left:auto;}
.s-chg{font-size:11px;color:#26A69A;margin-left:4px;}
.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(auto-fit,minmax(280px,1fr));gap:20px;}
.feature-card{padding:28px;background:#1B2838;border:1px solid #2C3E50;border-radius:2px;box-shadow:0 8px 30px rgba(0,0,0,.15);}
.feature-card .f-ic{width:44px;height:44px;margin-bottom:14px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#4A90E220,#26A69A20);border-radius:12px;font-size:22px;}
.feature-card h3{font-size:16px;font-weight:600;margin-bottom:6px;color:#E0ECF7;}
.feature-card p{font-size:13px;color:#7D9CB5;line-height:1.7;}
.download{padding:clamp(60px,8vw,100px) 0;background:#1B2838;}
.download h2{font-size:clamp(22px,3vw,34px);font-weight:700;text-align:center;margin-bottom:8px;}
.download .sub{text-align:center;color:#7D9CB5;margin-bottom:40px;font-size:14px;}
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:720px;margin:0 auto;}
.dl-card{padding:28px 20px;background:#0D1B2A;border:1px solid #2C3E50;border-radius:2px;text-align:center;transition:transform .2s;}
.dl-card:hover{transform:translateY(-3px);}
.dl-ic{font-size:28px;margin-bottom:12px;}
.dl-card h3{font-size:16px;font-weight:600;margin-bottom:4px;}
.dl-sub{font-size:12px;color:#7D9CB5;margin-bottom:14px;}
.dl-btn{display:inline-block;padding:8px 22px;background:linear-gradient(135deg,#4A90E2,#26A69A);color:#fff;border-radius:4px;font-weight:600;font-size:13px;text-decoration:none;}
@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 #2C3E50;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:#E0ECF7;}
.faq-item summary::after{content:"+";color:#4A90E2;font-size:18px;font-family:"SF Mono",Consolas,monospace;}
.faq-item[open] summary::after{content:"−";}
.faq-item p{margin-top:12px;color:#7D9CB5;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:2px;}
.screen-grid img{max-height:480px;width:auto;object-fit:contain;margin:0 auto;border-radius:2px;}
.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}