:root{
  --primary:#7C3AED;
  --primary-deep:#5B21B6;
  --primary-soft:#F1E8FD;
  --primary-mist:#F7F2FE;
  --dark:#221240;
  --bg:#F9F7FE;
  --card:#FFFFFF;
  --border:#E7DCF8;
  --text:#261A40;
  --muted:#6E6487;
  --ok:#2E9E6B;
  --bad:#E2636B;
  --radius:18px;
  --shadow:0 8px 24px rgba(124,58,237,.10);
  --shadow-hover:0 16px 36px rgba(124,58,237,.18);
  --nav-h:64px;
  --content-w:1180px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 16px)}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block;width:100%;height:auto;border:0}
button{font-family:inherit;cursor:pointer}
ul{list-style:none}
.container{max-width:var(--content-w);margin:0 auto;padding:0 24px}
.section{padding:92px 0}
.section-alt{background:var(--card)}
.sec-title{font-size:32px;font-weight:800;text-align:center;color:var(--dark)}
.sec-sub{text-align:center;color:var(--muted);margin-top:10px;font-size:16px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:12px;font-weight:600;transition:transform .25s ease,box-shadow .25s ease,background .25s ease;
}
.btn-primary{
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));
  color:#fff;padding:13px 30px;font-size:16px;box-shadow:0 8px 20px rgba(124,58,237,.30);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 28px rgba(124,58,237,.40)}

/* 顶部导航 */
.header{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);transition:box-shadow .3s ease;
}
.header.scrolled{box-shadow:0 6px 20px rgba(124,58,237,.12)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h);gap:20px}
.logo{font-size:22px;font-weight:800;color:var(--dark);letter-spacing:1px;white-space:nowrap;padding:10px 0;line-height:1.2}
.logo::first-letter{color:var(--primary)}
.nav{display:flex;align-items:center;gap:20px}
.nav-link{font-size:14px;color:var(--muted);transition:color .2s ease;white-space:nowrap}
.nav-link:hover{color:var(--primary)}
.nav-link.active{color:var(--primary);font-weight:700}
.btn-nav{
  background:var(--primary-soft);color:var(--primary-deep);
  padding:8px 14px;font-size:13px;border:1px solid var(--border);line-height:1.4;
}
.btn-nav:hover{background:var(--primary);color:#fff;transform:translateY(-1px);box-shadow:0 8px 18px rgba(124,58,237,.28)}

/* 首屏 Hero */
.hero{background:radial-gradient(60% 80% at 85% 10%,var(--primary-soft),transparent 60%),radial-gradient(50% 70% at 8% 90%,var(--primary-mist),transparent 55%),var(--bg)}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;align-items:center;gap:56px}
.hero-text h1{font-size:44px;font-weight:800;color:var(--dark);line-height:1.3}
.hero-desc{margin-top:20px;color:var(--muted);font-size:17px;max-width:560px}
.hero-btns{display:flex;gap:16px;margin-top:36px}
.hero-poster{justify-self:center;width:300px}
.hero-poster img{border-radius:var(--radius);box-shadow:0 18px 44px rgba(124,58,237,.24)}

/* 作品预览 */
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:44px}
.work-card{
  background:var(--card);border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--border);transition:transform .3s ease,box-shadow .3s ease;
}
.work-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.work-card figcaption{padding:14px 16px;font-weight:600;color:var(--dark);text-align:center;font-size:15px}

/* 产品介绍 */
.intro-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:44px}
.intro-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:30px 26px;transition:transform .3s ease,box-shadow .3s ease;
}
.intro-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.intro-card h3{font-size:19px;font-weight:700;color:var(--dark);margin-bottom:12px}
.intro-card h3::before{content:"";display:block;width:34px;height:4px;border-radius:2px;background:var(--primary);margin-bottom:12px}
.intro-card p{color:var(--muted);font-size:15px}

/* 核心功能 */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:44px}
.feature-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:30px 26px;transition:transform .3s ease,box-shadow .3s ease;
}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.feature-icon{
  display:inline-flex;align-items:center;justify-content:center;
  width:52px;height:52px;border-radius:14px;background:var(--primary-soft);color:var(--primary);
  margin-bottom:18px;
}
.feature-icon svg{width:26px;height:26px}
.feature-card h3{font-size:18px;font-weight:700;color:var(--dark);margin-bottom:10px}
.feature-card p{color:var(--muted);font-size:14.5px}

/* 优势对比 */
.compare{
  margin-top:44px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  background:var(--card);box-shadow:var(--shadow);
}
.compare-row{display:grid;grid-template-columns:1fr 1.2fr 1.2fr}
.compare-row>div{padding:16px 18px;font-size:15px;border-top:1px solid var(--border)}
.compare-row:first-child>div{border-top:0}
.compare-dim{color:var(--muted);background:var(--primary-mist);font-weight:600}
.compare-head>div{font-weight:800;background:var(--dark);color:#fff}
.compare-ours{color:var(--ok);font-weight:600}
.compare-theirs{color:var(--bad)}

/* 平台数据 */
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:44px}
.data-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:34px 20px;text-align:center;transition:transform .3s ease,box-shadow .3s ease;
}
.data-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.data-icon{display:inline-flex;color:var(--primary);margin-bottom:12px}
.data-icon svg{width:30px;height:30px}
.data-num{font-size:38px;font-weight:800;color:var(--primary-deep);line-height:1.2}
.data-num span{font-size:22px}
.data-label{color:var(--muted);font-size:15px;margin-top:6px}

/* 用户评价 */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:44px}
.review-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:26px;transition:transform .3s ease,box-shadow .3s ease;
}
.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{
  width:46px;height:46px;border-radius:50%;flex:none;
  background:linear-gradient(135deg,var(--primary),var(--primary-deep));color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:700;
}
.review-name{font-weight:700;color:var(--dark);font-size:15px}
.review-stars{color:#F5A623;font-size:14px;letter-spacing:2px;line-height:1.4}
.review-text{color:var(--muted);font-size:14.5px}

/* 版本更新 */
.update-card{
  max-width:760px;margin:44px auto 0;background:var(--card);
  border:1px solid var(--border);border-radius:var(--radius);padding:34px;
  box-shadow:var(--shadow);
}
.update-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:18px;border-bottom:1px solid var(--border);margin-bottom:18px}
.update-head h3{font-size:20px;font-weight:800;color:var(--dark)}
.update-time{color:var(--muted);font-size:14px;margin-top:4px}
.update-badge{
  flex:none;background:var(--primary-soft);color:var(--primary-deep);
  font-size:13px;font-weight:700;padding:6px 14px;border-radius:999px;
}
.update-log li{
  position:relative;padding:9px 0 9px 26px;color:var(--text);font-size:15px;
}
.update-log li::before{
  content:"";position:absolute;left:4px;top:17px;width:8px;height:8px;border-radius:50%;background:var(--primary);
}

/* FAQ */
.faq-list{max-width:760px;margin:44px auto 0}
.faq-item{
  background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:14px;
  overflow:hidden;transition:box-shadow .3s ease;
}
.faq-item.open{box-shadow:var(--shadow)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:none;border:0;padding:20px 22px;font-size:16px;font-weight:600;color:var(--dark);text-align:left;
}
.faq-icon{width:20px;height:20px;flex:none;color:var(--primary);transition:transform .3s ease}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a-inner{padding:0 22px 20px;color:var(--muted);font-size:14.5px}

/* 下载区域 */
.download{background:radial-gradient(70% 90% at 50% 0%,var(--primary-soft),transparent 65%),var(--bg)}
.download-card{
  max-width:680px;margin:0 auto;background:var(--card);border:1px solid var(--border);
  border-radius:24px;padding:52px 40px;text-align:center;box-shadow:var(--shadow);
}
.download-card h1{font-size:32px;font-weight:800;color:var(--dark)}
.download-meta{color:var(--muted);font-size:14px;margin-top:12px}
.download-btns{display:flex;gap:16px;justify-content:center;margin-top:30px}
.btn-lg{padding:15px 32px;font-size:16px}
.download-tip{margin-top:26px;color:var(--primary-deep);font-weight:600;font-size:15px}

/* 页脚 */
.footer{border-top:1px solid var(--border);padding:28px 0;background:var(--card);text-align:center}
.footer p{color:var(--muted);font-size:14px}
.footer-link{color:var(--primary-deep);font-weight:600}

/* 返回顶部 */
.back-top{
  position:fixed;right:26px;bottom:30px;z-index:90;
  width:46px;height:46px;border-radius:50%;border:1px solid var(--border);
  background:var(--card);color:var(--primary);display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease,transform .3s ease;
}
.back-top svg{width:20px;height:20px}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{transform:translateY(-4px);background:var(--primary);color:#fff}

/* 平板 */
@media (max-width:1024px){
  .nav{display:none}
  .hero-inner{gap:36px}
  .hero-text h1{font-size:36px}
  .hero-poster{width:260px}
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .data-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .intro-grid{grid-template-columns:1fr;max-width:680px;margin-left:auto;margin-right:auto}
}

/* 手机 */
@media (max-width:768px){
  .section{padding:64px 20px}
  .container{padding:0}
  .header-inner{padding:0 20px}
  .sec-title{font-size:26px}
  .hero-inner{display:flex;flex-direction:column;gap:30px}
  .hero-text h1{font-size:30px}
  .hero-desc{font-size:15.5px}
  .hero-btns{flex-direction:column;width:100%}
  .hero-btns .btn{width:100%;padding:14px 0}
  .hero-poster{width:66%;max-width:300px}
  .works-grid{grid-template-columns:1fr;gap:20px}
  .work-card figcaption{padding:12px 14px}
  .intro-grid,.feature-grid,.review-grid{grid-template-columns:1fr}
  .feature-card{padding:26px 22px}
  .data-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .data-card{padding:24px 12px}
  .data-num{font-size:30px}
  .data-num span{font-size:17px}
  .data-label{font-size:13px}
  .compare-row>div{padding:12px 8px;font-size:13px}
  .update-card{padding:24px 18px}
  .update-head{flex-direction:column;align-items:flex-start;gap:10px}
  .download-card{padding:38px 20px;border-radius:18px}
  .download-card h1{font-size:25px}
  .download-meta{font-size:12.5px;white-space:nowrap}
  .download-btns{flex-direction:column;margin-top:24px}
  .download-btns .btn{width:100%;padding:15px 0}
  .back-top{right:16px;bottom:22px;width:42px;height:42px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none;animation:none}
}