:root{
  --primary:#FF7A3D;
  --primary-deep:#EF5B1F;
  --primary-soft:#FFF1E9;
  --dark:#2B2F3A;
  --text:#3A3F4B;
  --text-sub:#66707C;
  --border:#F1E7DE;
  --bg:#FFFDFB;
  --bg-soft:#FBF4EE;
  --card:#FFFFFF;
  --radius:16px;
  --radius-lg:20px;
  --shadow-sm:0 4px 14px rgba(43,47,58,.06);
  --shadow:0 12px 32px rgba(255,122,61,.16);
  --nav-h:68px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 14px)}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;font-size:16px;line-height:1.7;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%;height:auto}
button{font-family:inherit}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
.section{padding:88px 0}

.sec-title{font-size:30px;font-weight:800;color:var(--dark);text-align:center;line-height:1.3}
.sec-sub{margin-top:10px;text-align:center;color:var(--text-sub);font-size:15px}
.sec-title.light{color:#fff}
.sec-sub.light{color:#B7BEC9}

.btn{display:inline-flex;align-items:center;justify-content:center;border:none;border-radius:999px;font-weight:600;cursor:pointer;transition:transform .25s,box-shadow .25s,background .25s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-deep);transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-ghost{background:var(--primary-soft);color:var(--primary-deep)}
.btn-ghost:hover{background:#FFE3D2;transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.btn-lg{font-size:16px;padding:13px 34px}

.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,253,251,.94);border-bottom:1px solid transparent;transition:box-shadow .3s,border-color .3s}
.nav.scrolled{border-bottom-color:var(--border);box-shadow:0 6px 20px rgba(43,47,58,.06)}
.nav-inner{height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:14px}
.logo{display:flex;align-items:center;gap:8px;font-size:22px;font-weight:800;color:var(--dark);flex:none}
.logo svg{color:var(--primary);flex:none}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{display:block;padding:6px 11px;font-size:14px;color:var(--text-sub);border-radius:8px;transition:color .2s,background .2s}
.nav-links a:hover{color:var(--primary);background:var(--primary-soft)}
.nav-links a.active{color:var(--primary-deep);font-weight:700}
.nav-btn{font-size:13px;padding:6px 16px;flex:none}

/* ===== Hero ===== */
.hero{padding:calc(var(--nav-h) + 64px) 0 84px;background:linear-gradient(180deg,var(--primary-soft) 0%,var(--bg) 100%)}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.ver{display:inline-block;font-weight:700;color:var(--primary-deep);border:1.5px solid var(--primary);border-radius:999px;vertical-align:middle}
.hero h1{font-size:44px;font-weight:800;line-height:1.25;color:var(--dark)}
.hero h1 .ver{font-size:17px;margin-left:12px;background:#fff;padding:3px 14px}
.hero-desc{margin:20px 0 30px;font-size:17px;color:var(--text-sub);max-width:560px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-img{max-width:340px;width:100%;margin:0 auto;position:relative}
.hero-img::before{content:"";position:absolute;inset:-26px -20px auto;height:70%;background:radial-gradient(closest-side,rgba(255,122,61,.18),transparent);z-index:-1}
.hero-img img{width:100%;border-radius:var(--radius-lg);box-shadow:var(--shadow);border:6px solid #fff}

/* ===== 作品预览 ===== */
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:44px}
.work-card{overflow:hidden}
.work-card img{width:100%;transition:transform .35s}
.work-card:hover img{transform:scale(1.03)}

/* ===== 产品介绍 ===== */
.intro-text{max-width:820px;margin:34px auto 0;text-align:center;font-size:16px;color:var(--text)}
.intro-chips{display:flex;justify-content:center;gap:16px;margin-top:34px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;border-radius:999px;background:var(--primary-soft);color:var(--primary-deep);font-weight:600;font-size:15px;border:1px solid var(--border)}
.chip svg{width:18px;height:18px;flex:none}

/* ===== 核心功能 ===== */
.features{background:var(--bg-soft)}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
.feature{padding:30px 26px}
.f-icon{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:14px;background:var(--primary-soft);color:var(--primary-deep);margin-bottom:18px}
.f-icon svg{width:26px;height:26px}
.feature h3{font-size:18px;font-weight:700;color:var(--dark);margin-bottom:8px}
.feature p{font-size:14px;color:var(--text-sub)}

/* ===== 优势对比 ===== */
.cmp{margin-top:44px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff}
.cmp-head,.cmp-row{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;border-bottom:1px solid var(--border)}
.cmp-head:last-child,.cmp-row:last-child{border-bottom:none}
.cmp-head span,.cmp-row span{padding:15px 12px;text-align:center;font-size:14px}
.cmp-head span{background:var(--primary-soft);color:var(--dark);font-weight:700}
.cmp-row span{color:var(--text)}
.cmp-row:nth-child(even) span{background:#FFFBF7}
.cmp-row span.cmp-dim{background:#fff;text-align:left;color:var(--dark);font-weight:600}
.cmp-head span:first-child,.cmp-row span:first-child{border-right:1px solid var(--border)}
.cmp .ok{color:var(--primary-deep);font-weight:600}
.cmp .mid{color:var(--text-sub)}
.cmp .no{color:#B4BAC4}

/* ===== 平台数据 ===== */
.stats{background:linear-gradient(135deg,var(--dark) 0%,#3A3340 100%)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:44px}
.stat{text-align:center;padding:30px 12px;border-radius:var(--radius);background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1)}
.stat strong{display:block;font-size:42px;font-weight:800;color:#FF9A66;line-height:1.2}
.stat span{margin-top:8px;display:block;font-size:14px;color:#D5DAE2}

/* ===== 用户评价 ===== */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
.rv{padding:26px}
.rv-top{display:flex;align-items:center;gap:14px}
.rv-avatar{width:46px;height:46px;border-radius:50%;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;font-size:19px;font-weight:700;flex:none}
.rv-name{display:block;font-size:15px;font-weight:700;color:var(--dark)}
.rv-stars{display:block;font-size:13px;letter-spacing:2px;color:#FFB400;margin-top:2px}
.rv-text{margin-top:16px;font-size:14px;color:var(--text-sub)}

/* ===== 版本更新 ===== */
.up-card{max-width:760px;margin:44px auto 0;padding:34px 36px}
.up-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-bottom:20px;border-bottom:1px solid var(--border)}
.up-ver{font-size:20px;font-weight:800;color:var(--primary-deep);background:var(--primary-soft);padding:6px 18px;border-radius:999px;border:1px solid var(--primary)}
.up-date{font-size:14px;color:var(--text-sub)}
.up-log{list-style:none;margin-top:20px;display:grid;gap:14px}
.up-log li{position:relative;padding-left:22px;font-size:15px;color:var(--text)}
.up-log li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

/* ===== FAQ ===== */
.faq-list{max-width:760px;margin:44px auto 0;display:grid;gap:14px}
.faq-item{overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;background:none;border:none;padding:20px 24px;font-size:16px;font-weight:600;color:var(--dark);cursor:pointer;text-align:left;border-radius:var(--radius)}
.faq-icon{position:relative;width:18px;height:18px;flex:none;transition:transform .3s}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--primary);border-radius:2px;top:50%;left:50%;transform:translate(-50%,-50%)}
.faq-icon::before{width:18px;height:2px}
.faq-icon::after{width:2px;height:18px}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-item.open .faq-q{color:var(--primary-deep)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-item.open .faq-a{max-height:480px}
.faq-a p{padding:0 24px 22px;font-size:15px;color:var(--text-sub)}

/* ===== 下载 ===== */
.download{padding:80px 0 96px}
.dl-card{max-width:720px;margin:0 auto;text-align:center;padding:54px 40px;border-radius:var(--radius-lg)}
.dl-card h1{font-size:34px;font-weight:800;color:var(--dark);line-height:1.3}
.dl-card h1 .ver{font-size:16px;margin-left:10px;background:var(--primary-soft);padding:3px 13px}
.dl-meta{margin-top:14px;font-size:14px;color:var(--text-sub)}
.dl-btns{display:flex;gap:16px;justify-content:center;margin-top:30px;flex-wrap:wrap}
.dl-tip{margin-top:24px;font-size:15px;color:var(--text)}

/* ===== 页脚 ===== */
.footer{background:#262A33;padding:34px 0;text-align:center}
.footer p{font-size:14px;color:#AEB4BE}
.footer a{color:#FFB08A}
.footer a:hover{color:#FFD9C2}

/* ===== 返回顶部 ===== */
.back-top{position:fixed;right:24px;bottom:28px;width:46px;height:46px;border:none;border-radius:50%;background:var(--primary);color:#fff;font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .3s,transform .3s,visibility .3s,background .3s;z-index:90;box-shadow:var(--shadow)}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--primary-deep)}

/* ===== 响应式 ===== */
@media (max-width:1024px){
  .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)}
  .hero h1{font-size:38px}
}

@media (max-width:860px){
  .nav-links{display:none}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .logo{font-size:24px}
  .logo svg{width:28px;height:28px}
  .nav-btn{padding:9px 18px}
  .section{padding:64px 0}
  .sec-title{font-size:25px}
  .hero{padding:calc(var(--nav-h) + 26px) 0 56px}
  .hero-inner{grid-template-columns:1fr;gap:34px;text-align:center}
  .hero h1{font-size:30px}
  .hero h1 .ver{font-size:14px;margin-left:8px;padding:2px 10px}
  .hero-desc{margin:16px auto 26px;font-size:15px}
  .hero-btns{flex-direction:column;align-items:stretch}
  .hero-btns .btn{width:100%}
  .hero-img{max-width:280px}
  .works-grid{grid-template-columns:1fr;gap:20px;margin-top:34px}
  .intro-chips{gap:10px;margin-top:26px}
  .chip{padding:8px 16px;font-size:14px}
  .features-grid{grid-template-columns:1fr;gap:18px;margin-top:34px}
  .feature{padding:26px 22px}
  .cmp-head span,.cmp-row span{padding:12px 5px;font-size:13px}
  .stats-grid{gap:14px;margin-top:34px}
  .stat{padding:24px 8px}
  .stat strong{font-size:30px}
  .reviews-grid{grid-template-columns:1fr;gap:18px;margin-top:34px}
  .up-card{padding:26px 22px;margin-top:34px}
  .up-head{flex-direction:column;align-items:flex-start;gap:10px}
  .up-log li{font-size:14px}
  .faq-list{margin-top:34px}
  .faq-q{padding:18px 18px;font-size:15px}
  .faq-a p{padding:0 18px 18px;font-size:14px}
  .download{padding:56px 0 72px}
  .dl-card{padding:40px 20px}
  .dl-card h1{font-size:26px}
  .dl-card h1 .ver{font-size:13px;margin-left:6px;padding:2px 9px}
  .dl-meta{margin-top:12px;font-size:12px;white-space:nowrap}
  .dl-btns{flex-direction:column;align-items:stretch;margin-top:26px;gap:12px}
  .dl-btns .btn{width:100%}
  .dl-tip{font-size:14px}
  .back-top{right:16px;bottom:20px;width:42px;height:42px}
}