:root{
  --primary:#2563eb;
  --primary-dark:#1e4fd8;
  --primary-light:#eaf2ff;
  --dark:#0f172a;
  --text:#1f2937;
  --text-sub:#4b5563;
  --border:#e5e9f0;
  --bg:#f7f9fc;
  --card:#fff;
  --radius:16px;
  --shadow:0 8px 24px rgba(15,23,42,.07);
  --shadow-hover:0 16px 40px rgba(15,23,42,.13);
  --header-h:64px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;font-size:15px;color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{display:block;width:100%;height:auto}
ul,ol{list-style:none}
button{font-family:inherit}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}

.header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.93);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.header.scrolled{box-shadow:0 6px 24px rgba(15,23,42,.08)}
.nav{display:flex;align-items:center;gap:20px;height:var(--header-h)}
.logo{font-size:24px;font-weight:800;color:var(--dark);line-height:1;white-space:nowrap}
.logo span{color:var(--primary)}
.nav-links{display:flex;align-items:center;margin-left:auto;gap:2px}
.nav-links a{padding:7px 11px;font-size:14px;color:var(--text-sub);border-radius:8px;transition:.2s}
.nav-links a:hover,.nav-links a.active{color:var(--primary);background:var(--primary-light)}
.btn-download{padding:6px 16px;font-size:13px;font-weight:600;color:#fff;background:var(--primary);border-radius:999px;white-space:nowrap;transition:.2s}
.btn-download:hover{background:var(--primary-dark);transform:translateY(-1px)}

.hero{padding:calc(var(--header-h) + 56px) 0 72px;background:linear-gradient(180deg,var(--primary-light) 0%,var(--bg) 100%)}
.hero-inner{display:flex;align-items:center;gap:64px}
.hero-text{flex:1 1 auto}
.hero-text h1{font-size:42px;line-height:1.3;color:var(--dark);font-weight:800}
.ver-tag{display:inline-block;margin-left:8px;padding:4px 12px;font-size:15px;font-weight:700;color:var(--primary);background:var(--card);border:1px solid var(--primary);border-radius:999px;vertical-align:middle}
.hero-desc{margin:18px 0 30px;font-size:16px;color:var(--text-sub);max-width:560px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 32px;font-size:16px;font-weight:600;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:.25s}
.btn-primary{color:#fff;background:var(--primary)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 12px 28px rgba(37,99,235,.35)}
.btn-outline{color:var(--primary);background:var(--card);border-color:var(--primary)}
.btn-outline:hover{background:var(--primary-light);transform:translateY(-2px);box-shadow:0 12px 28px rgba(37,99,235,.18)}
.hero-img{flex:0 0 300px}
.hero-img img{border-radius:20px;box-shadow:0 24px 60px rgba(15,23,42,.18)}

.section{padding:84px 0}
.section-alt{background:var(--card)}
.sec-title{font-size:32px;font-weight:800;color:var(--dark);text-align:center}
.sec-sub{margin:10px 0 44px;font-size:15px;color:var(--text-sub);text-align:center}

.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.work-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.work-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.work-card img{transition:transform .4s}
.work-card:hover img{transform:scale(1.03)}

.intro{max-width:880px;margin:0 auto}
.intro p{font-size:15px;color:var(--text-sub);margin-bottom:16px}
.intro-list{margin-top:8px}
.intro-list li{position:relative;padding:8px 0 8px 28px;font-size:15px;color:var(--text)}
.intro-list li::before{content:"";position:absolute;left:4px;top:16px;width:10px;height:10px;border-radius:50%;background:var(--primary)}

.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.f-icon{display:flex;align-items:center;justify-content:center;width:52px;height:52px;margin-bottom:18px;border-radius:14px;background:var(--primary-light);color:var(--primary)}
.f-icon svg{width:26px;height:26px}
.feature-card h3{font-size:18px;font-weight:700;color:var(--dark);margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-sub)}

.compare-wrap{max-width:920px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.compare{width:100%;table-layout:fixed;border-collapse:collapse}
.compare th,.compare td{padding:15px 20px;font-size:14px;text-align:left;border-bottom:1px solid var(--border)}
.compare thead th{color:#fff;background:var(--dark);font-weight:600}
.compare tbody tr:last-child td{border-bottom:none}
.compare td:first-child{color:var(--text-sub);white-space:nowrap}
.compare td:nth-child(2){color:var(--primary-dark);font-weight:600;background:var(--primary-light)}
.compare td:nth-child(3){color:var(--text-sub)}

.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:36px 16px 32px;text-align:center;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.stat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.stat-num{display:block;font-size:40px;font-weight:800;color:var(--primary);line-height:1.2}
.stat-label{display:block;margin-top:10px;font-size:14px;color:var(--text-sub)}

.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{display:flex;align-items:center;justify-content:center;width:46px;height:46px;border-radius:50%;color:#fff;background:var(--primary);font-size:18px;font-weight:700;flex-shrink:0}
.r-name{display:block;font-size:15px;font-weight:600;color:var(--dark)}
.r-stars{display:block;font-size:13px;color:#f59e0b;letter-spacing:2px;margin-top:2px}
.r-text{font-size:14px;color:var(--text-sub);line-height:1.75}

.version-card{max-width:820px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:38px;box-shadow:var(--shadow)}
.ver-head{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-bottom:22px}
.ver-badge{display:inline-block;padding:8px 18px;font-size:22px;font-weight:800;color:#fff;background:var(--primary);border-radius:12px}
.ver-date{font-size:14px;color:var(--text-sub)}
.ver-log li{position:relative;padding:11px 0 11px 28px;font-size:15px;color:var(--text);border-bottom:1px dashed var(--border)}
.ver-log li:last-child{border-bottom:none;padding-bottom:0}
.ver-log li::before{content:"";position:absolute;left:4px;top:19px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:14px;overflow:hidden;transition:box-shadow .3s}
.faq-item.open{box-shadow:var(--shadow)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:18px 22px;font-size:15px;font-weight:600;color:var(--dark);background:none;border:none;cursor:pointer;text-align:left}
.faq-icon{position:relative;width:20px;height:20px;flex-shrink:0}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);border-radius:2px;background:var(--primary);transition:transform .3s}
.faq-icon::before{width:14px;height:2px}
.faq-icon::after{width:2px;height:14px}
.faq-item.open .faq-icon::after{transform:translate(-50%,-50%) rotate(90deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 22px 20px;font-size:14px;color:var(--text-sub)}

.download{background:linear-gradient(165deg,#152238 0%,var(--dark) 100%)}
.dl-title{font-size:36px;font-weight:800;color:#fff;text-align:center}
.dl-title .ver-tag{color:#fff;border-color:rgba(255,255,255,.5);background:rgba(255,255,255,.08)}
.dl-info{margin:16px 0 34px;font-size:14px;color:#c7d2e0;text-align:center;white-space:nowrap}
.dl-btns{display:flex;justify-content:center;gap:18px;flex-wrap:wrap}
.download .btn-outline{color:#fff;background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.55)}
.download .btn-outline:hover{background:rgba(255,255,255,.16)}
.dl-tip{margin-top:26px;font-size:14px;color:#9fb0c6;text-align:center}

.footer{padding:30px 0;background:#0b1220;color:#8b9ab5;font-size:13px;text-align:center}
.footer a{color:#c7d2e0;font-weight:600}
.footer a:hover{color:#fff}

.to-top{position:fixed;right:24px;bottom:30px;z-index:99;display:flex;align-items:center;justify-content:center;width:46px;height:46px;border:none;border-radius:50%;color:#fff;background:var(--primary);cursor:pointer;box-shadow:var(--shadow-hover);opacity:0;visibility:hidden;transform:translateY(14px);transition:opacity .3s,transform .3s,visibility .3s}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--primary-dark)}
.to-top svg{width:20px;height:20px}

@media (max-width:1024px){
  .nav{gap:12px}
  .nav-links a{padding:7px 8px;font-size:13px}
  .hero-inner{gap:40px}
  .hero-text h1{font-size:34px}
  .hero-img{flex-basis:260px}
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px){
  .wrap{padding:0 20px}
  .nav-links{display:none}
  .btn-download{margin-left:auto}
  .hero{padding:calc(var(--header-h) + 28px) 0 48px}
  .hero-inner{flex-direction:column;gap:36px;text-align:center}
  .hero-text h1{font-size:28px}
  .hero-desc{margin:16px auto 28px;font-size:15px}
  .hero-btns{flex-direction:column}
  .btn{width:100%}
  .hero-img{flex:none;width:230px;margin:0 auto}
  .section{padding:56px 0}
  .sec-title{font-size:26px}
  .sec-sub{margin-bottom:32px}
  .works-grid,.features-grid,.reviews-grid{grid-template-columns:1fr}
  .compare-wrap{overflow-x:auto}
  .compare th,.compare td{padding:11px 10px;font-size:13px}
  .version-card{padding:26px 20px}
  .ver-badge{font-size:18px}
  .dl-title{font-size:26px}
  .dl-btns{flex-direction:column}
  .dl-info{font-size:12px}
  .to-top{right:16px;bottom:20px;width:42px;height:42px}
}