```css
:root{
    --bg:#050714;
    --bg2:#070a1d;
    --panel:rgba(19,22,46,.74);
    --panel2:rgba(13,17,39,.88);
    --line:rgba(126,96,255,.22);
    --line2:rgba(117,91,255,.5);
    --purple:#7658ff;
    --purple2:#a77bff;
    --text:#f5f3ff;
    --muted:#969ab8;
    --green:#32d7a0;
    --cyan:#43b9ff;
    --shadow:0 20px 60px rgba(0,0,0,.32)
}

*{
    box-sizing:border-box
}

html{
    scroll-behavior:smooth
}

body{
    margin:0;
    color:var(--text);
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
    background:radial-gradient(circle at 50% 5%,#11133a 0,#07091b 32%,#03050e 75%);
    min-height:100vh;
    overflow-x:hidden
}

body:before{
    content:"";
    position:fixed;
    inset:0;
    pointer-events:none;
    opacity:.35;
    background-image:
        linear-gradient(rgba(100,90,180,.035) 1px,transparent 1px),
        linear-gradient(90deg,rgba(100,90,180,.035) 1px,transparent 1px);
    background-size:70px 70px;
    mask-image:linear-gradient(to bottom,#000,transparent 70%)
}

a{
    color:inherit;
    text-decoration:none
}

.container{
    width:min(1180px,calc(100% - 44px));
    margin:auto
}

.site-header{
    position:sticky;
    top:0;
    z-index:30;
    background:rgba(4,6,17,.76);
    backdrop-filter:blur(18px);
    border-bottom:1px solid rgba(120,100,255,.13)
}

.nav{
    height:66px;
    display:flex;
    align-items:center;
    gap:34px
}

.brand{
    font-weight:800;
    font-size:14px;
    display:flex;
    align-items:center;
    gap:8px;
    white-space:nowrap;
    color:#f5f3ff
}

.brand-mark{
    width:22px;
    height:22px;
    border-radius:6px;
    display:grid;
    place-items:center;
    background:linear-gradient(135deg,#6c5cff,#b56cff);
    box-shadow:0 0 18px rgba(122,91,255,.55);
    font-size:12px
}

.nav-links{
    margin-left:auto;
    display:flex;
    align-items:center;
    gap:25px;
    color:#c3c5db;
    font-size:12px
}

.nav-links a{
    transition:.2s
}

.nav-links a:hover,
.nav-links a.active{
    color:#fff
}

.nav-cta{
    padding:8px 16px;
    border-radius:9px;
    background:linear-gradient(100deg,#5c5bff,#9858ff);
    box-shadow:0 7px 25px rgba(101,82,255,.35);
    color:#fff!important
}

.mobile-menu{
    display:none;
    margin-left:auto;
    font-size:22px
}

main{
    position:relative
}

.hero{
    min-height:700px;
    display:grid;
    place-items:center;
    text-align:center;
    padding:100px 0 70px;
    position:relative
}

.hero:before{
    content:"";
    position:absolute;
    width:720px;
    height:430px;
    left:50%;
    top:90px;
    transform:translateX(-50%);
    background:radial-gradient(ellipse,rgba(73,62,255,.2),transparent 67%);
    filter:blur(10px);
    pointer-events:none
}

.eyebrow,
.section-tag{
    display:inline-flex;
    align-items:center;
    gap:7px;
    color:#8d7cff;
    font-size:10px;
    letter-spacing:2px;
    font-weight:700;
    background:rgba(77,66,181,.12);
    border:1px solid rgba(113,92,255,.2);
    padding:7px 13px;
    border-radius:20px
}

.hero h1{
    font-size:58px;
    line-height:1.08;
    margin:20px 0 14px;
    letter-spacing:-2px;
    color:#f5f3ff
}

.gradient{
    background:linear-gradient(90deg,#fff 20%,#8e72ff 75%,#c99cff);
    -webkit-background-clip:text;
    background-clip:text;
    color:transparent
}

.hero p{
    color:#aeb1c9;
    line-height:1.8;
    font-size:15px;
    margin:0 auto;
    max-width:610px
}

.actions{
    display:flex;
    justify-content:center;
    gap:12px;
    margin:30px 0
}

.btn{
    border:1px solid rgba(125,106,255,.25);
    padding:12px 22px;
    border-radius:9px;
    font-size:13px;
    background:rgba(17,20,46,.75);
    color:#ddd;
    box-shadow:0 10px 30px rgba(0,0,0,.16)
}

.btn.primary{
    background:linear-gradient(100deg,#5864ff,#a05cff);
    border-color:transparent;
    color:white;
    box-shadow:0 12px 30px rgba(101,78,255,.35)
}

.platforms{
    font-size:11px;
    color:#777c9d
}

.platforms span{
    margin:0 8px
}

.stats{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:15px;
    padding:35px 0
}

.stat{
    padding:28px 18px;
    text-align:center
}

.stat strong{
    display:block;
    font-size:28px;
    color:#fff
}

.stat span{
    color:#797e9d;
    font-size:11px;
    margin-top:7px;
    display:block
}

.section{
    padding:80px 0
}

.section-head{
    text-align:center;
    margin-bottom:38px
}

.section-head h2{
    font-size:30px;
    margin:15px 0 8px;
    color:#f5f3ff
}

.section-head p{
    color:#8f94b0;
    font-size:12px
}

.preview{
    display:grid;
    grid-template-columns:1fr 1.25fr 1fr;
    align-items:end;
    gap:28px;
    min-height:380px
}

.device{
    border:1px solid rgba(112,96,255,.25);
    border-radius:22px;
    background:linear-gradient(160deg,rgba(26,28,55,.9),rgba(8,11,27,.85));
    padding:10px;
    box-shadow:var(--shadow)
}

.device img{
    width:100%;
    height:auto;
    display:block;
    border-radius:15px;
    max-height:none;
    object-fit:contain;
}

.device.center{
    transform:translateY(-22px)
}

.device-label{
    text-align:center;
    font-size:10px;
    color:#777b99;
    padding:10px
}

.live{
    color:#ff3b55;
    font-size:10px;
    letter-spacing:1px;
    margin-top:12px;
    text-align:center
}

.features{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:14px
}

.card{
    background:linear-gradient(145deg,rgba(25,28,55,.8),rgba(10,13,31,.8));
    border:1px solid var(--line);
    border-radius:14px;
    padding:22px;
    box-shadow:0 16px 45px rgba(0,0,0,.16)
}

.card:hover{
    border-color:rgba(124,99,255,.48)
}

.icon{
    width:34px;
    height:34px;
    border-radius:9px;
    display:grid;
    place-items:center;
    background:rgba(91,73,255,.12);
    border:1px solid rgba(113,94,255,.2);
    margin-bottom:14px
}

.card h1,
.card h2,
.card h3{
    color:#f5f3ff
}

.card h3{
    font-size:14px;
    margin:0 0 8px
}

.card p{
    font-size:11px;
    color:#888da9;
    line-height:1.8;
    margin:0
}

.pricing{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:15px
}

.price-card{
    position:relative
}

.price-card.featured{
    border-color:#7560ff;
    box-shadow:0 0 0 1px rgba(117,96,255,.2),0 20px 60px rgba(77,53,255,.16)
}

.badge{
    position:absolute;
    right:14px;
    top:14px;
    font-size:9px;
    color:#ffcc69;
    background:rgba(255,167,52,.09);
    border:1px solid rgba(255,177,59,.2);
    padding:5px 8px;
    border-radius:20px
}

.price{
    font-size:32px;
    font-weight:800;
    margin:14px 0;
    color:#fff
}

.price small{
    font-size:11px;
    color:#777d9e;
    font-weight:500
}

.checks{
    padding:0;
    margin:22px 0;
    list-style:none;
    color:#a3a7c0;
    font-size:11px;
    line-height:2.1
}

.checks li:before{
    content:'✓';
    color:#68d9a9;
    margin-right:8px
}

.card .btn{
    display:block;
    text-align:center
}

.cta{
    margin:60px 0;
    padding:55px 25px;
    text-align:center;
    border:1px solid rgba(116,93,255,.2);
    border-radius:18px;
    background:radial-gradient(circle at 50% 20%,rgba(100,74,255,.14),transparent 60%),rgba(14,17,38,.7)
}

.cta h2{
    font-size:25px;
    margin:12px 0;
    color:#f5f3ff
}

.contact-grid{
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:18px
}

.contact-item{
    display:flex;
    align-items:center;
    gap:15px
}

.contact-item .icon{
    margin:0
}

.footer{
    border-top:1px solid rgba(110,100,170,.1);
    padding:45px 0 25px;
    margin-top:50px
}

.footer-grid{
    display:grid;
    grid-template-columns:1.5fr 1fr 1fr;
    gap:30px
}

.footer h4{
    font-size:12px;
    margin:0 0 15px;
    color:#f5f3ff
}

.footer p,
.footer a{
    font-size:11px;
    color:#747994;
    line-height:2
}

.copyright{
    border-top:1px solid rgba(110,100,170,.1);
    margin-top:30px;
    padding-top:20px;
    color:#626780;
    font-size:10px
}

.page-hero{
    padding:80px 0 35px;
    text-align:center
}

.page-hero h1{
    font-size:34px;
    margin:14px 0 8px;
    color:#f5f3ff
}

.page-hero p{
    font-size:12px;
    color:#858aa5
}

.guide-tabs{
    display:flex;
    justify-content:center;
    gap:8px;
    margin:25px 0 40px
}

.guide-tab{
    padding:9px 17px;
    border-radius:8px;
    background:#10142b;
    border:1px solid rgba(112,94,255,.18);
    font-size:11px;
    color:#858aa8;
    cursor:pointer
}

.guide-tab.active{
    background:linear-gradient(100deg,#5c61ff,#8d59ff);
    color:#fff
}

.steps{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:13px
}

.step-num{
    color:#8570ff;
    font-size:10px;
    font-weight:800;
    margin-bottom:12px
}


/* =========================================================
   视频播放器 - PC
   ========================================================= */

.video-box{
    margin:22px auto 45px;
    width:100%;
    max-width:800px;
    aspect-ratio:16 / 9;
    background:#000;
    border:1px solid rgba(105,88,255,.28);
    border-radius:16px;
    overflow:hidden;
    display:flex;
    align-items:center;
    justify-content:center;
    position:relative
}

.video-box video,
.video-box .tutorial-video{
    display:block;
    width:auto;
    height:auto;
    max-width:100%;
    max-height:100%;
    object-fit:contain;
    object-position:center center;
    background:#000;
    margin:0;
    padding:0;
    min-width:0;
    min-height:0;
    flex:0 0 auto
}

.video-placeholder{
    color:#69708e;
    font-size:12px;
    text-align:center
}


/* =========================================================
   FAQ
   ========================================================= */

.faq{
    max-width:800px;
    margin:auto
}

.faq-item{
    border:1px solid rgba(110,94,255,.17);
    border-radius:10px;
    background:rgba(12,15,34,.72);
    margin:8px 0;
    overflow:hidden
}

.faq-q{
    padding:16px;
    font-size:12px;
    cursor:pointer;
    display:flex;
    justify-content:space-between;
    color:#f5f3ff
}

.faq-a{
    padding:0 16px 16px;
    color:#858aa6;
    font-size:11px;
    line-height:1.8;
    display:none
}

.faq-item.open .faq-a{
    display:block
}


/* =========================================================
   下载
   ========================================================= */

.download-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:15px
}

.download-card{
    text-align:center
}

.download-card .icon{
    margin:0 auto 15px
}

.download-card .version{
    color:#8e92ab;
    font-size:10px
}

.download-card .meta{
    display:grid;
    gap:5px;
    text-align:left;
    margin:20px 0;
    color:#888da7;
    font-size:10px
}


/* =========================================================
   购买页面
   ========================================================= */

.buy-layout{
    display:grid;
    grid-template-columns:1.3fr .8fr;
    gap:18px
}

.plan-list{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:12px
}

.plan{
    cursor:pointer
}

.plan h1,
.plan h2,
.plan h3{
    color:#f5f3ff
}

.plan.selected{
    border-color:#7360ff;
    box-shadow:0 0 0 1px rgba(115,96,255,.3)
}

.order-summary{
    position:sticky;
    top:90px
}

.form-row{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:10px
}

.field{
    background:#0b0f25;
    border:1px solid rgba(108,95,190,.18);
    padding:12px;
    border-radius:8px;
    color:#888da8;
    font-size:11px
}

.notice{
    font-size:10px;
    color:#8c90a9;
    background:rgba(88,72,180,.08);
    border:1px solid rgba(110,92,230,.15);
    padding:12px;
    border-radius:9px;
    margin:12px 0
}

.contact-big{
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:18px
}

.contact-big .card{
    padding:34px
}

.contact-big .icon{
    width:48px;
    height:48px
}


/* =========================================================
   手机端
   ========================================================= */

@media(max-width:800px){

    .container{
        width:min(100% - 28px,480px)
    }

    .site-header{
        height:56px
    }

    .nav{
        height:56px
    }

    .nav-links{
        display:none
    }

    .mobile-menu{
        display:block
    }

    .hero{
        min-height:620px;
        padding:75px 0 30px
    }

    .hero h1{
        font-size:38px;
        letter-spacing:-1.2px;
        color:#f5f3ff
    }

    .hero p{
        font-size:12px
    }

    .actions{
        flex-direction:column;
        align-items:stretch;
        margin:25px 25px
    }

    .btn{
        padding:12px 16px
    }

    .stats{
        grid-template-columns:repeat(2,1fr);
        gap:4px;
        padding:20px 0
    }

    .stat{
        padding:18px 8px
    }

    .stat strong{
        font-size:23px
    }

    .section{
        padding:55px 0
    }

    .section-head{
        margin-bottom:25px
    }

    .section-head h2{
        font-size:24px
    }

    .preview{
        grid-template-columns:1fr;
        gap:15px
    }

    .device.center{
        transform:none
    }

    .device img{
        max-height:none
    }

    .features,
    .pricing,
    .download-grid,
    .steps{
        grid-template-columns:1fr
    }

    .card{
        padding:18px
    }

    .contact-grid,
    .contact-big,
    .buy-layout{
        grid-template-columns:1fr
    }

    .page-hero{
        padding:55px 0 25px
    }

    .page-hero h1{
        font-size:29px;
        color:#f5f3ff
    }

    .guide-tabs{
        overflow:auto;
        justify-content:flex-start;
        padding-bottom:4px
    }

    .guide-tab{
        white-space:nowrap
    }

    .order-summary{
        position:static
    }

    .plan-list{
        grid-template-columns:1fr
    }

    .form-row{
        grid-template-columns:1fr
    }

    .footer-grid{
        grid-template-columns:1fr 1fr
    }

    .footer-grid>div:first-child{
        grid-column:1/-1
    }

    .footer{
        margin-top:30px
    }

    .hero:before{
        width:420px;
        height:320px
    }


    /* =====================================================
       手机端 iOS 视频
       
       原视频：720 × 1280
       比例：9 : 16
       
       手机端播放器也使用 9 : 16，
       视频完整铺满播放器，不裁剪。
       ===================================================== */

    .video-box{
        width:100%;
        max-width:100%;
        aspect-ratio:9 / 16;

        background:#000;

        display:flex;
        align-items:center;
        justify-content:center;

        border-radius:12px;

        overflow:hidden;

        position:relative;
    }

    .video-box video,
    .video-box .tutorial-video{
        display:block;

        width:100%;
        height:100%;

        max-width:100%;
        max-height:100%;

        object-fit:contain;
        object-position:center center;

        background:#000;

        margin:0;
        padding:0;

        min-width:0;
        min-height:0;

        flex:0 0 auto;
    }

}
```