:root{
  --primary:#FF6B35;
  --primary-rgb:255,107,53;
  --primary-deep:#F0501F;
  --dark:#232838;
  --dark-muted:#AEB4C2;
  --text:#3E4554;
  --muted:#667085;
  --border:#EDEFF4;
  --bg:#F6F7FA;
  --card:#FFFFFF;
  --radius:16px;
  --shadow:0 6px 18px rgba(35,40,56,.08);
  --shadow-hover:0 14px 30px rgba(var(--primary-rgb),.18);
  --header-h:64px;
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit;}
img{display:block;width:100%;height:auto;border-radius:12px;}
.container{max-width:1200px;margin:0 auto;padding:0 24px;}
section{scroll-margin-top:calc(var(--header-h) + 10px);}

.header{
  position:fixed;top:0;left:0;right:0;height:var(--header-h);
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--border);
  z-index:100;
}
.header-inner{height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:24px;}
.logo{font-size:24px;font-weight:800;color:var(--dark);letter-spacing:1px;flex-shrink:0;}
.nav{display:flex;align-items:center;gap:20px;}
.nav a{font-size:14px;color:var(--muted);white-space:nowrap;transition:color .2s;}
.nav a:hover{color:var(--primary);}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:999px;font-weight:600;cursor:pointer;border:none;
  transition:all .25s ease;text-align:center;
}
.btn-nav{font-size:13px;padding:8px 18px;background:var(--primary);color:#fff;flex-shrink:0;}
.btn-nav:hover{background:var(--primary-deep);box-shadow:0 6px 14px rgba(var(--primary-rgb),.35);}

.hero{
  background:linear-gradient(180deg,#FFF6F0 0%,#FFFFFF 70%);
  padding:calc(var(--header-h) + 56px) 0 76px;
}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;}
.hero-text h1{font-size:42px;line-height:1.25;color:var(--dark);font-weight:800;margin-bottom:18px;}
.hero-text p{font-size:16px;color:var(--text);margin-bottom:30px;max-width:560px;}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap;}
.btn-primary{background:var(--primary);color:#fff;font-size:16px;padding:14px 34px;}
.btn-ghost{background:var(--card);color:var(--primary-deep);font-size:16px;padding:13px 33px;border:2px solid var(--primary);}
.btn-ghost:hover{background:var(--primary);color:#fff;transform:translateY(-2px);}
.btn-primary:hover,.btn-download:hover{
  background:var(--primary-deep);
  transform:translateY(-2px);
  box-shadow:0 12px 24px rgba(var(--primary-rgb),.35);
}
.hero-pic img{border-radius:20px;box-shadow:var(--shadow-hover);}

.ver{color:var(--primary);}

.section{padding:84px 0;}
.section-title{font-size:32px;font-weight:800;color:var(--dark);text-align:center;margin-bottom:10px;}
.section-sub{font-size:15px;color:var(--muted);text-align:center;margin-bottom:48px;}

.works{background:var(--bg);}
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.work-card,.feature-card,.review-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  transition:all .3s ease;
}
.work-card:hover,.feature-card:hover,.review-card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-hover);
}
.work-card{padding:12px;}

.intro{background:var(--card);}
.intro-body{max-width:860px;margin:0 auto;}
.intro-body p{font-size:16px;color:var(--text);margin-bottom:16px;text-align:center;}
.intro-chips{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:28px;}
.chip{background:var(--bg);border:1px solid var(--border);color:var(--primary-deep);font-size:14px;font-weight:600;padding:8px 20px;border-radius:999px;}

.features{background:var(--bg);}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.feature-card{padding:30px 26px;}
.feature-card h3{font-size:19px;color:var(--dark);margin-bottom:10px;}
.feature-card p{font-size:14px;color:var(--muted);line-height:1.7;}
.feature-icon{width:52px;height:52px;border-radius:14px;background:rgba(var(--primary-rgb),.1);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;margin-bottom:16px;}
.feature-icon svg{
  width:26px;height:26px;
  fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;
}

.compare{background:var(--card);}
.compare-wrap{overflow-x:auto;}
.compare table{width:100%;border-collapse:collapse;min-width:560px;}
.compare th,.compare td{padding:15px 18px;text-align:center;border:1px solid var(--border);font-size:15px;}
.compare th{background:var(--dark);color:#fff;font-weight:600;}
.compare th:nth-child(2){background:var(--primary);}
.compare td:first-child{font-weight:700;color:var(--dark);text-align:left;}
.compare td:nth-child(2){background:rgba(var(--primary-rgb),.06);color:var(--primary-deep);font-weight:600;}

.data{background:var(--dark);}
.data .section-title{color:#fff;}
.data .section-sub{color:var(--dark-muted);}
.data-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.data-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);padding:32px 20px;text-align:center;transition:all .3s ease;}
.data-card:hover{transform:translateY(-6px);background:rgba(255,255,255,.1);}
.data-num{font-size:36px;font-weight:800;color:var(--primary);line-height:1.2;}
.data-label{font-size:14px;color:var(--dark-muted);margin-top:8px;}

.reviews{background:var(--bg);}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.review-card{padding:26px;}
.review-card p{font-size:14px;color:var(--muted);line-height:1.75;}
.review-head{display:flex;align-items:center;gap:14px;margin-bottom:14px;}
.review-avatar{width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#FF9A5C);color:#fff;font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.review-meta{flex:1;}
.review-name{font-size:15px;font-weight:700;color:var(--dark);}
.review-stars{color:#FFB400;font-size:14px;letter-spacing:2px;margin-top:2px;}

.version{background:var(--card);}
.version-card{max-width:760px;margin:0 auto;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:36px;}
.version-top{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;margin-bottom:18px;}
.version-num{font-size:30px;font-weight:800;color:var(--primary-deep);}
.version-date{font-size:14px;color:var(--muted);}
.version-list{list-style:none;}
.version-list li{position:relative;padding:8px 0 8px 24px;font-size:15px;color:var(--text);border-bottom:1px dashed var(--border);}
.version-list li:last-child{border-bottom:none;}
.version-list li::before{content:"";position:absolute;left:2px;top:17px;width:8px;height:8px;border-radius:50%;background:var(--primary);}

.faq{background:var(--bg);}
.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 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:none;padding:18px 22px;font-size:16px;font-weight:600;color:var(--dark);cursor:pointer;text-align:left;font-family:inherit;}
.faq-q::after{
  content:"";width:10px;height:10px;flex-shrink:0;
  border-right:2px solid var(--muted);
  border-bottom:2px solid var(--muted);
  transform:rotate(45deg);
  transition:transform .3s ease;
  margin-top:-4px;
}
.faq-item.open .faq-q::after{transform:rotate(225deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.faq-item.open .faq-a{max-height:400px;}
.faq-a p{padding:0 22px 20px;font-size:14px;color:var(--muted);line-height:1.8;}

.download{background:linear-gradient(180deg,#FFFFFF 0%,var(--bg) 100%);}
.download-card{max-width:720px;margin:0 auto;text-align:center;background:var(--card);border:1px solid var(--border);border-radius:24px;padding:48px 40px;box-shadow:var(--shadow);}
.download h1{font-size:34px;color:var(--dark);font-weight:800;margin-bottom:6px;}
.download-meta{font-size:14px;color:var(--muted);margin-bottom:32px;white-space:nowrap;}
.download-btns{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:22px;}
.btn-download{background:var(--primary);color:#fff;font-size:16px;font-weight:700;padding:16px 38px;}
.download-tip{font-size:14px;color:var(--primary-deep);}

.footer{background:var(--dark);padding:28px 0;text-align:center;color:var(--dark-muted);font-size:14px;}
.footer a{color:#E8EAF0;transition:color .2s;}
.footer a:hover{color:var(--primary);}

.to-top{
  position:fixed;right:26px;bottom:34px;width:46px;height:46px;border-radius:50%;
  background:var(--primary);color:#fff;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 20px rgba(var(--primary-rgb),.4);z-index:99;
  opacity:0;visibility:hidden;transform:translateY(12px);transition:all .3s ease;
}
.to-top svg{
  width:20px;height:20px;
  fill:none;stroke:currentColor;stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover{background:var(--primary-deep);}

@media (max-width:1024px){
  .hero-text h1{font-size:34px;}
  .works-grid{grid-template-columns:repeat(2,1fr);}
  .features-grid,.reviews-grid{grid-template-columns:repeat(2,1fr);}
  .nav{gap:14px;}
  .nav a{font-size:13px;}
}

@media (max-width:768px){
  .container{padding:0 20px;}
  .nav{display:none;}
  .hero{padding:calc(var(--header-h) + 36px) 0 52px;}
  .hero-inner{grid-template-columns:1fr;gap:36px;}
  .hero-text{text-align:center;}
  .hero-text p{margin:0 auto 28px;}
  .hero-btns{justify-content:center;}
  .hero-pic{max-width:420px;margin:0 auto;}
  .section{padding:64px 0;}
  .section-title{font-size:27px;}
  .section-sub{margin-bottom:36px;}
  .data-grid{grid-template-columns:repeat(2,1fr);gap:16px;}
  .data-num{font-size:30px;}
  .compare th,.compare td{padding:11px 10px;font-size:13px;}
  .download-card{padding:40px 24px;}
}

@media (max-width:576px){
  .works-grid,.features-grid,.reviews-grid{grid-template-columns:1fr;gap:16px;}
  .hero-text h1{font-size:28px;}
  .hero-btns{flex-direction:column;width:100%;}
  .hero-btns .btn{width:100%;}
  .data-grid{gap:14px;}
  .compare th,.compare td{padding:9px 6px;font-size:12px;}
  .version-card{padding:26px 20px;}
  .version-num{font-size:24px;}
  .version-list li{font-size:14px;}
  .faq-q{font-size:15px;padding:16px;}
  .faq-a p{padding:0 16px 18px;font-size:13px;}
  .download-card{padding:36px 16px;}
  .download h1{font-size:26px;}
  .download-meta{font-size:12px;}
  .download-btns{flex-direction:column;width:100%;}
  .btn-download{width:100%;}
  .download-tip{font-size:13px;}
  .to-top{right:16px;bottom:22px;width:42px;height:42px;}
  .footer{font-size:13px;}
}