:root{
  --c-primary:#4B5FE0;
  --c-primary-deep:#3947B8;
  --c-dark:#20284A;
  --c-text:#2B3252;
  --c-muted:#6F78A0;
  --c-border:#E5E9F6;
  --c-bg:#F5F7FD;
  --c-card:#FFFFFF;
  --c-accent:#FF7BA9;
  --c-star:#FFB84D;
  --c-ok:#22C58B;
  --c-no:#FF7B84;
  --radius:16px;
  --shadow:0 12px 32px rgba(75,95,224,.10);
  --shadow-hover:0 18px 44px rgba(75,95,224,.18);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--c-text);background:var(--c-bg);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;border:none;background:none;cursor:pointer}
i{font-style:normal}

.container{max-width:1200px;margin:0 auto;padding:0 24px}
section{scroll-margin-top:72px}

.header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--c-border);transition:box-shadow .3s}
.header.scrolled{box-shadow:0 4px 20px rgba(32,40,74,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:24px;font-weight:800;color:var(--c-dark);letter-spacing:.5px;line-height:1}
.logo span{color:var(--c-primary)}
.nav-menu{display:flex;gap:20px}
.nav-menu a{font-size:14px;font-weight:500;color:var(--c-text);padding:6px 2px;position:relative;transition:color .2s}
.nav-menu a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;border-radius:2px;background:var(--c-primary);transition:width .25s}
.nav-menu a:hover,.nav-menu a.active{color:var(--c-primary)}
.nav-menu a:hover::after,.nav-menu a.active::after{width:100%}
.nav-dl{font-size:13px;font-weight:600;color:#fff;background:linear-gradient(135deg,var(--c-primary),var(--c-primary-deep));padding:8px 16px;border-radius:999px;transition:transform .2s,box-shadow .2s;white-space:nowrap}
.nav-dl:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(75,95,224,.3)}

.btn{display:inline-flex;align-items:center;justify-content:center;font-size:16px;font-weight:600;padding:14px 34px;border-radius:999px;transition:transform .25s,box-shadow .25s,background .25s}
.btn-primary{color:#fff;background:linear-gradient(135deg,var(--c-primary),var(--c-primary-deep));box-shadow:0 10px 24px rgba(75,95,224,.28)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 32px rgba(75,95,224,.38)}
.btn-ghost{color:var(--c-primary);background:#fff;border:1.5px solid var(--c-primary)}
.btn-ghost:hover{transform:translateY(-3px);background:#EEF1FF;box-shadow:0 12px 26px rgba(75,95,224,.18)}
.btn-lg{padding:16px 40px;font-size:17px}
.btn-light{color:var(--c-primary);background:#fff;box-shadow:0 12px 30px rgba(0,0,0,.2)}
.btn-light:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(0,0,0,.28)}

.hero{padding:72px 0 64px;background:linear-gradient(180deg,#EDF0FF 0%,var(--c-bg) 100%);overflow:hidden}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero-text h1{font-size:42px;line-height:1.3;font-weight:800;color:var(--c-dark)}
.hero-text h1 em{font-style:normal;color:var(--c-primary)}
.hero-text p{margin:18px 0 30px;font-size:16px;line-height:1.9;color:var(--c-muted);max-width:540px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.hero-tags span{font-size:13px;color:var(--c-primary);background:#fff;border:1px solid #DCE2FF;padding:5px 14px;border-radius:999px}
.hero-img{justify-self:center;width:100%;max-width:340px}
.hero-img img{width:100%;border-radius:22px;border:6px solid #fff;box-shadow:0 24px 60px rgba(32,40,74,.22)}

.section{padding:84px 0}
.section-alt{background:#fff}
.section-dark{background:linear-gradient(135deg,#1B2240 0%,#252F5E 100%)}
.sec-head{text-align:center;margin-bottom:48px}
.sec-head h2{font-size:32px;font-weight:800;color:var(--c-dark)}
.sec-head p{margin-top:10px;font-size:15px;color:var(--c-muted)}
.sec-head.light h2{color:#fff}
.sec-head.light p{color:#B8C0E8}

.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.work-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);overflow:hidden;transition:transform .3s,box-shadow .3s}
.work-card:hover,.feature-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-hover)}
.work-card img{width:100%}
.work-info{padding:14px 16px 16px}
.work-info h3{font-size:16px;color:var(--c-dark);margin-bottom:4px}
.work-info span{font-size:13px;color:var(--c-muted)}

.intro-text{max-width:820px;margin:0 auto 44px;text-align:center;font-size:16px;line-height:1.9;color:var(--c-muted)}
.intro-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.intro-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);padding:32px 26px;text-align:center;transition:transform .3s,box-shadow .3s}
.intro-card:hover,.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.intro-card h3{font-size:18px;color:var(--c-dark);margin-bottom:10px}
.intro-card p{font-size:14px;line-height:1.8;color:var(--c-muted)}

.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);padding:32px 26px;transition:transform .3s,box-shadow .3s}
.feature-icon{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:16px;background:#EEF1FF;color:var(--c-primary);margin-bottom:18px}
.feature-icon svg{width:26px;height:26px}
.feature-card h3{font-size:18px;color:var(--c-dark);margin-bottom:10px}
.feature-card p{font-size:14px;line-height:1.8;color:var(--c-muted)}

.cmp-wrap{max-width:920px;margin:0 auto}
.cmp-table{width:100%;table-layout:fixed;border-collapse:collapse;background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);overflow:hidden}
.cmp-table th,.cmp-table td{padding:16px 18px;text-align:center;font-size:15px;border-bottom:1px solid var(--c-border)}
.cmp-table th{background:#F0F3FF;color:var(--c-dark);font-weight:700}
.cmp-table td:first-child{text-align:left;font-weight:600;color:var(--c-dark);background:#FAFBFE}
.cmp-table tbody tr:last-child td{border-bottom:none}
.cmp-table tbody tr{transition:background .2s}
.cmp-table tbody tr:hover{background:#F8FAFF}
.ok,.no{display:inline-flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:50%;font-size:12px;color:#fff;margin-right:6px;vertical-align:-2px}
.ok{background:var(--c-ok)}
.no{background:var(--c-no)}
.ok::after{content:"✓"}
.no::after{content:"✕"}

.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.data-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:34px 20px;text-align:center;transition:transform .3s,background .3s}
.data-card:hover{transform:translateY(-6px);background:rgba(255,255,255,.1)}
.data-card b{font-size:42px;font-weight:800;color:#fff;line-height:1.2}
.data-card .unit{font-size:20px;font-weight:700;color:var(--c-accent);margin-left:2px}
.data-card p{margin-top:10px;font-size:14px;color:#B8C0E8}

.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);padding:26px;transition:transform .3s,box-shadow .3s}
.review-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.avatar{display:flex;align-items:center;justify-content:center;width:46px;height:46px;border-radius:50%;font-size:18px;font-weight:700;color:#fff;background:var(--ac,var(--c-primary));flex-shrink:0}
.review-user b{display:block;font-size:15px;color:var(--c-dark)}
.stars{color:var(--c-star);font-size:13px;letter-spacing:2px}
.review-card p{font-size:14px;line-height:1.8;color:var(--c-muted)}

.update-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:40px;align-items:start}
.version-card{background:linear-gradient(135deg,var(--c-primary),var(--c-primary-deep));border-radius:var(--radius);padding:42px 32px;color:#fff;text-align:center;position:sticky;top:96px}
.ver-tag{display:inline-block;font-size:12px;background:rgba(255,255,255,.2);padding:4px 14px;border-radius:999px;margin-bottom:14px}
.version-card h3{font-size:38px;font-weight:800;margin-bottom:8px}
.version-card p{font-size:14px;opacity:.85;margin-bottom:26px}
.update-list{background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius);padding:30px 34px}
.update-list li{position:relative;padding:13px 0 13px 26px;font-size:15px;color:var(--c-text);border-bottom:1px dashed var(--c-border)}
.update-list li:last-child{border-bottom:none}
.update-list li::before{content:"";position:absolute;left:0;top:23px;width:8px;height:8px;border-radius:50%;background:var(--c-primary)}

.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--c-card);border:1px solid var(--c-border);border-radius:14px;margin-bottom:14px;overflow:hidden;transition:box-shadow .3s}
.faq-item.open{box-shadow:var(--shadow)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;font-size:16px;font-weight:600;color:var(--c-dark);text-align:left}
.faq-icon{position:relative;width:18px;height:18px;flex-shrink:0}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--c-primary);border-radius:2px;transition:transform .3s}
.faq-icon::before{width:18px;height:2px;top:8px;left:0}
.faq-icon::after{width:2px;height:18px;top:0;left:8px}
.faq-item.open .faq-icon::after{transform:scaleY(0)}
.faq-a{max-height:0;overflow:hidden;font-size:14px;line-height:1.9;color:var(--c-muted);transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:280px}
.faq-a-inner{padding:0 22px 20px}

.download{background:linear-gradient(135deg,var(--c-primary) 0%,#3A4ABF 55%,#2B3A9E 100%);padding:88px 0;text-align:center}
.download h1{font-size:40px;font-weight:800;color:#fff}
.dl-info{margin:14px 0 36px;font-size:15px;color:#D6DDFF}
.dl-btns{display:flex;justify-content:center;gap:18px;flex-wrap:wrap}
.download .btn-ghost{color:#fff;background:transparent;border-color:rgba(255,255,255,.7)}
.download .btn-ghost:hover{background:rgba(255,255,255,.12)}
.dl-slogan{margin-top:30px;font-size:15px;color:#E3E8FF}

.footer{background:var(--c-dark);padding:26px 0;text-align:center}
.footer p{font-size:14px;color:#AAB2D4}
.footer a{color:#fff;transition:color .2s}
.footer a:hover{color:var(--c-accent)}

.to-top{position:fixed;right:24px;bottom:28px;width:46px;height:46px;border-radius:50%;background:var(--c-primary);color:#fff;font-size:20px;line-height:1;box-shadow:0 10px 24px rgba(75,95,224,.35);opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,visibility .3s;z-index:90}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--c-primary-deep)}

@media (max-width:1200px){
  .nav-menu{gap:14px}
  .hero-text h1{font-size:38px}
}

@media (max-width:1024px){
  .nav-menu a{font-size:13px}
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .data-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:960px){
  .nav-menu{display:none}
  .intro-grid,.feature-grid,.review-grid{grid-template-columns:repeat(2,1fr)}
  .update-grid{grid-template-columns:1fr;gap:28px}
  .version-card{position:static}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .section{padding:56px 0}
  .sec-head{margin-bottom:34px}
  .sec-head h2{font-size:26px}
  .hero{padding:36px 0 44px}
  .hero-inner{grid-template-columns:1fr;gap:30px;text-align:center}
  .hero-text h1{font-size:30px}
  .hero-text p{margin-left:auto;margin-right:auto;font-size:15px}
  .hero-btns{flex-direction:column}
  .hero-btns .btn{width:100%}
  .hero-tags{justify-content:center}
  .hero-tags span{font-size:14px}
  .work-info span{font-size:14px}
  .hero-img{max-width:280px}
  .works-grid,.intro-grid,.feature-grid,.review-grid,.data-grid{grid-template-columns:1fr}
  .cmp-table th,.cmp-table td{padding:12px 8px;font-size:12.5px}
  .cmp-table td:first-child{font-size:13px}
  .data-card b{font-size:36px}
  .download{padding:60px 0}
  .download h1{font-size:28px}
  .dl-info{margin:12px 0 28px;font-size:12.5px;white-space:nowrap}
  .dl-btns{flex-direction:column}
  .dl-btns .btn{width:100%}
  .dl-slogan{font-size:14px}
  .to-top{right:16px;bottom:20px}
}

@media (max-width:420px){
  .nav-dl{font-size:12px;padding:8px 14px}
}