:root{
  --primary:#ff6b35;
  --primary-deep:#ef5b24;
  --primary-soft:#fff1ea;
  --dark:#232833;
  --text:#454c5c;
  --muted:#6f7686;
  --border:#e9edf4;
  --bg:#f6f7fb;
  --card:#fff;
  --radius:16px;
  --shadow:0 8px 20px rgba(35,40,51,.06);
  --shadow-hover:0 16px 32px rgba(255,107,53,.16);
  --header-h:64px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,sans-serif;font-size:16px;line-height:1.7;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;border:none;background:none;cursor:pointer}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
section[id]{scroll-margin-top:calc(var(--header-h) + 12px)}
.header{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-h);background:rgba(255,255,255,.96);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.header.scrolled{box-shadow:0 4px 16px rgba(35,40,51,.07)}
.header-inner{max-width:1200px;height:100%;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{font-size:24px;font-weight:800;color:var(--dark);letter-spacing:1px;line-height:1}
.logo em{font-style:normal;color:var(--primary)}
.nav{display:flex;align-items:center;gap:4px}
.nav a{display:block;padding:8px 12px;font-size:15px;color:var(--text);border-radius:8px;transition:color .2s,background .2s}
.nav a:hover,.nav a.active{color:var(--primary);background:var(--primary-soft)}
.nav .nav-download{margin-left:8px;padding:7px 18px;font-size:14px;font-weight:600;color:#fff;background:var(--primary);border-radius:999px;transition:background .2s,transform .2s}
.nav .nav-download:hover{background:var(--primary-deep);transform:translateY(-1px)}
.hero{padding:calc(var(--header-h) + 72px) 0 76px;background:linear-gradient(180deg,#fff,var(--bg))}
.hero-inner{display:grid;grid-template-columns:1.08fr .92fr;gap:52px;align-items:center}
.hero h1{font-size:44px;line-height:1.3;color:var(--dark);font-weight:800}
.hero .ver,.download-box h1 .ver{display:inline-block;padding:4px 14px;font-size:18px;font-weight:700;color:var(--primary);background:var(--primary-soft);border:1px solid #ffd9c6;border-radius:999px;vertical-align:middle}
.hero .ver{margin-left:12px}
.download-box h1 .ver{margin-left:10px;padding:3px 12px;font-size:16px}
.hero-desc{margin:20px 0 34px;max-width:560px;font-size:17px;color:var(--muted)}
.hero-btns{display:flex;flex-wrap:wrap;gap:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;height:52px;padding:0 34px;font-size:17px;font-weight:600;border-radius:999px;transition:transform .25s,box-shadow .25s,background .25s,color .25s}
.btn-primary{color:#fff;background:var(--primary);box-shadow:0 10px 24px rgba(255,107,53,.28)}
.btn-primary:hover{background:var(--primary-deep);transform:translateY(-2px);box-shadow:0 14px 30px rgba(255,107,53,.34)}
.btn-outline{color:var(--primary);background:var(--card);border:1px solid var(--primary)}
.btn-outline:hover{background:var(--primary-soft);transform:translateY(-2px)}
.hero-pic img{width:100%;height:auto;border-radius:var(--radius);box-shadow:var(--shadow)}
.section{padding:84px 0}
.section-alt{background:var(--card)}
.section-head{max-width:720px;margin:0 auto 46px;text-align:center}
.section-head h2{font-size:32px;font-weight:800;color:var(--dark);line-height:1.3}
.section-head p{margin-top:10px;font-size:15px;color:var(--muted)}
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.work-card,.feature-card,.data-card,.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);transition:transform .25s,box-shadow .25s}
.work-card:hover,.feature-card:hover,.data-card:hover,.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.work-card{overflow:hidden}
.work-card img{width:100%;height:auto}
.work-name{padding:13px 14px 15px;font-size:15px;font-weight:600;color:var(--dark);text-align:center}
.intro-card,.update-card,.compare-box,.download-box{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.intro-card{max-width:900px;margin:0 auto;padding:40px 44px}
.intro-card p{font-size:16px;color:var(--text)}
.intro-card p+p{margin-top:18px}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{padding:30px 28px}
.feature-icon{display:flex;align-items:center;justify-content:center;width:56px;height:56px;margin-bottom:18px;color:var(--primary);background:var(--primary-soft);border-radius:14px}
.feature-icon svg{width:26px;height:26px}
.feature-card h3{font-size:19px;font-weight:700;color:var(--dark)}
.feature-card p{margin-top:8px;font-size:14.5px;color:var(--muted)}
.compare-box{max-width:960px;margin:0 auto;overflow:hidden}
.compare-row{display:grid;grid-template-columns:1fr 1fr 1fr}
.compare-cell{padding:17px 14px;font-size:15px;text-align:center;color:var(--text);border-bottom:1px solid var(--border)}
.compare-row:last-child .compare-cell{border-bottom:none}
.compare-head .compare-cell{font-size:16px;font-weight:700;color:var(--dark);background:var(--bg)}
.compare-cell:first-child{font-weight:600;color:var(--dark)}
.compare-cell.best{color:var(--primary);background:var(--primary-soft);font-weight:600}
.data-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.data-card{padding:36px 20px;text-align:center}
.data-num{font-size:44px;font-weight:800;color:var(--primary);line-height:1.1}
.data-num small{font-size:20px;font-weight:700}
.data-label{margin-top:10px;font-size:15px;color:var(--muted)}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{padding:26px}
.review-head{display:flex;align-items:center;gap:14px}
.review-avatar{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:48px;height:48px;font-size:20px;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--primary),#ffa36b);border-radius:50%}
.review-meta{min-width:0}
.review-name{display:block;font-size:16px;font-weight:600;color:var(--dark)}
.review-stars{display:block;margin-top:2px;font-size:14px;letter-spacing:2px;color:#ffb400}
.review-text{margin-top:14px;font-size:14.5px;color:var(--muted)}
.update-card{max-width:860px;margin:0 auto;padding:38px 44px}
.update-title{font-size:24px;font-weight:800;color:var(--dark)}
.update-title .ver-tag{display:inline-block;margin-right:10px;padding:3px 12px;font-size:15px;font-weight:700;color:#fff;background:var(--primary);border-radius:8px;vertical-align:middle}
.update-date{margin:12px 0 20px;font-size:14px;color:var(--muted)}
.update-list li{position:relative;padding:10px 0 10px 28px;font-size:15px;color:var(--text);border-bottom:1px dashed var(--border)}
.update-list li:last-child{border-bottom:none}
.update-list li::before{content:"✓";position:absolute;left:4px;top:10px;font-size:14px;color:var(--primary)}
.faq-list{max-width:860px;margin:0 auto}
.faq-item{overflow:hidden;margin-bottom:16px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);transition:box-shadow .25s}
.faq-item.open{box-shadow:var(--shadow)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;padding:20px 24px;font-size:16.5px;font-weight:600;color:var(--dark);text-align:left}
.faq-arrow{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:28px;height:28px;font-size:14px;color:var(--primary);background:var(--primary-soft);border-radius:50%;transition:transform .3s}
.faq-item.open .faq-arrow{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 24px 22px;font-size:14.5px;color:var(--muted)}
.faq-item.open .faq-a{max-height:300px}
.download{padding:84px 0 96px;background:linear-gradient(180deg,var(--bg),#fff)}
.download-box{max-width:860px;margin:0 auto;padding:54px 40px;text-align:center;border-radius:20px}
.download-box h1{font-size:36px;font-weight:800;color:var(--dark);line-height:1.3}
.download-meta{margin:14px 0 34px;font-size:14px;color:var(--muted);white-space:nowrap}
.download-btns{display:flex;justify-content:center;gap:18px}
.download-tip{margin-top:30px;font-size:15px;color:var(--muted)}
.footer{padding:26px 0;font-size:14px;color:#a9b0be;text-align:center;background:var(--dark)}
.footer a{color:#fff;font-weight:600;transition:color .2s}
.footer a:hover{color:var(--primary)}
.back-top{position:fixed;right:24px;bottom:32px;z-index:90;display:flex;align-items:center;justify-content:center;width:46px;height:46px;font-size:20px;color:#fff;background:var(--primary);border-radius:50%;box-shadow:0 8px 20px rgba(255,107,53,.35);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .3s,visibility .3s,transform .3s,background .2s}
.back-top.show{opacity:1;visibility:visible;transform:none}
.back-top:hover{background:var(--primary-deep)}
@media (max-width:1024px){
  .nav a{padding:8px 9px;font-size:14px}
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid,.data-grid,.reviews-grid{grid-template-columns:repeat(2,1fr)}
  .hero{padding:calc(var(--header-h) + 56px) 0 60px}
  .hero-inner{gap:36px}
  .hero h1{font-size:36px}
  .section{padding:72px 0}
  .section-head h2{font-size:28px}
}
@media (max-width:900px){
  .nav a{display:none}
  .nav .nav-download{display:inline-flex;min-height:44px}
  .logo{display:flex;align-items:center;height:100%}
  .hero-inner{grid-template-columns:1fr}
  .hero-pic{max-width:420px;margin:0 auto}
}
@media (max-width:768px){
  .hero{padding:calc(var(--header-h) + 36px) 0 48px}
  .hero h1{font-size:30px;white-space:nowrap}
  .hero .ver{display:inline-block;margin-left:8px;padding:2px 10px;font-size:14px}
  .hero-desc{margin:18px 0 28px;font-size:15.5px}
  .hero-btns{flex-direction:column}
  .hero-btns .btn{width:100%;height:50px}
  .section{padding:56px 0}
  .section-head{margin-bottom:32px}
  .section-head h2{font-size:26px}
  .works-grid,.features-grid,.data-grid,.reviews-grid{grid-template-columns:1fr;gap:20px}
  .intro-card{padding:26px 22px}
  .intro-card p{font-size:15px}
  .compare-cell{padding:14px 6px;font-size:14px}
  .compare-head .compare-cell{font-size:14px}
  .update-card{padding:26px 22px}
  .update-title{font-size:20px}
  .update-list li{font-size:14px}
  .faq-q{padding:17px 18px;font-size:15.5px}
  .faq-a p{padding:0 18px 18px;font-size:14px}
  .download{padding:56px 0 64px}
  .download-box{padding:40px 22px}
  .download-box h1{font-size:27px}
  .download-box h1 .ver{display:block;width:fit-content;margin:12px auto 0}
  .download-meta{margin:12px 0 28px;font-size:12px}
  .download-btns{flex-direction:column}
  .download-btns .btn{width:100%}
  .download-tip{font-size:14px}
  .back-top{right:16px;bottom:22px;width:42px;height:42px}
}