:root{
  --primary:#E8434A;
  --primary-dark:#C92E38;
  --primary-light:#FDEDEE;
  --dark:#1C1E26;
  --dark-2:#242632;
  --text:#23272F;
  --text-2:#5B6170;
  --bg:#F6F7F9;
  --card:#FFFFFF;
  --border:#E9EBF0;
  --radius:16px;
  --shadow:0 10px 30px rgba(28,30,38,.08);
  --nav-h:64px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  padding-top:var(--nav-h);
}
img{display:block;width:100%;height:auto}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
section[id]{scroll-margin-top:calc(var(--nav-h) + 12px)}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:12px;font-size:15px;font-weight:600;line-height:1.2;
  transition:background .25s,transform .25s,box-shadow .25s;white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 16px rgba(232,67,74,.30)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 10px 22px rgba(232,67,74,.38)}
.btn-dark{background:var(--dark);color:#fff}
.btn-dark:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(28,30,38,.25)}
.btn-light{background:#fff;color:var(--dark)}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(0,0,0,.25)}

.nav{
  position:fixed;top:0;left:0;right:0;height:var(--nav-h);
  background:rgba(255,255,255,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);z-index:100;transition:box-shadow .3s;
}
.nav.scrolled{box-shadow:0 6px 24px rgba(28,30,38,.08)}
.nav-inner{height:var(--nav-h);display:flex;align-items:center;gap:20px}
.logo{font-size:24px;font-weight:800;white-space:nowrap;line-height:1.35;padding:4px 0}
.logo span{color:var(--primary)}
.nav-links{display:flex;flex:1;justify-content:center;gap:2px}
.nav-links a{padding:10px 11px;font-size:14px;color:var(--text-2);border-radius:8px;transition:color .2s;white-space:nowrap}
.nav-links a:hover{color:var(--primary)}
.nav-links a.active{color:var(--primary);font-weight:600}
.nav-btn{padding:6px 16px;font-size:13px;border-radius:10px}

.hero{
  padding:calc(var(--nav-h) + 52px) 0 76px;
  background:linear-gradient(160deg,#FFF4F5 0%,var(--bg) 55%,#EFF3FF 100%);
}
.hero-inner{display:flex;align-items:center;gap:56px}
.hero-text{flex:1.15}
.hero h1{font-size:42px;line-height:1.3;font-weight:800;letter-spacing:1px}
.ver{
  display:inline-block;vertical-align:middle;margin-left:8px;
  background:var(--primary);color:#fff;font-size:14px;font-weight:700;
  padding:2px 12px;border-radius:999px;line-height:1.8;
}
.hero-desc{margin:20px 0 30px;font-size:17px;color:var(--text-2);max-width:560px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-points{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.hero-points li{
  padding:6px 14px;border:1px solid var(--border);border-radius:999px;
  background:var(--card);font-size:13px;color:var(--text-2);display:flex;align-items:center;gap:6px;
}
.hero-points li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary)}
.hero-img{flex:1;max-width:380px;margin-left:auto}
.hero-img img{border-radius:20px;box-shadow:0 18px 44px rgba(28,30,38,.16);border:6px solid #fff}

.section{padding:80px 0}
.sec-title{font-size:30px;font-weight:800;text-align:center;line-height:1.4}
.sec-title::after{content:"";display:block;width:42px;height:3px;border-radius:2px;background:var(--primary);margin:12px auto 0}
.sec-sub{text-align:center;color:var(--text-2);margin-top:12px;font-size:15px}

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

.intro-text{max-width:880px;margin:26px auto 0;text-align:center}
.intro-text p{font-size:15.5px;color:var(--text-2);margin-bottom:14px}
.intro-points{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.intro-point{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:26px 24px;text-align:center;transition:transform .3s,box-shadow .3s;
}
.intro-point:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.intro-point h3{font-size:17px;margin-bottom:8px}
.intro-point p{font-size:14px;color:var(--text-2)}

.features-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,box-shadow .3s;
}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.feature-icon{
  width:52px;height:52px;border-radius:14px;background:var(--primary-light);
  color:var(--primary);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}
.feature-card h3{font-size:17px;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-2)}

.cmp{
  display:grid;grid-template-columns:120px repeat(3,1fr);
  border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  background:var(--card);margin-top:44px;
}
.cmp-row{display:contents}
.cmp-label,.cmp-cell{
  padding:16px;display:flex;align-items:center;justify-content:center;
  text-align:center;font-size:14px;border-bottom:1px solid var(--border);
}
.cmp-label{background:#FAFBFC;font-weight:600;color:var(--text-2)}
.cmp-cell.hot{background:var(--primary-light);color:var(--primary-dark);font-weight:600}
.cmp-head .cmp-label{background:var(--dark);color:#fff}
.cmp-head .cmp-cell{background:var(--dark);color:#fff;font-weight:700}
.cmp-head .cmp-cell.hot{background:var(--primary)}
.cmp-row:last-child .cmp-label,.cmp-row:last-child .cmp-cell{border-bottom:0}

.stats{background:linear-gradient(150deg,var(--dark) 0%,var(--dark-2) 100%);padding:72px 0}
.stats-title{color:#fff}
.stats-sub{color:rgba(255,255,255,.62)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;margin-top:44px}
.stat{text-align:center}
.stat-num{font-size:42px;font-weight:800;color:#fff;line-height:1.2}
.stat-num .num{color:var(--primary)}
.stat-label{margin-top:8px;color:rgba(255,255,255,.65);font-size:14px}

.reviews-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:24px;transition:transform .3s,box-shadow .3s;
}
.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.review-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.avatar{
  width:44px;height:44px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:18px;font-weight:700;
}
.reviews-grid .review-card:nth-child(1) .avatar{background:#E8434A}
.reviews-grid .review-card:nth-child(2) .avatar{background:#4C6FFF}
.reviews-grid .review-card:nth-child(3) .avatar{background:#F5A623}
.reviews-grid .review-card:nth-child(4) .avatar{background:#22B07D}
.reviews-grid .review-card:nth-child(5) .avatar{background:#7B61FF}
.reviews-grid .review-card:nth-child(6) .avatar{background:#EC6FA6}
.review-info .name{font-weight:700;font-size:15px}
.stars{color:#F5A623;font-size:14px;letter-spacing:2px;margin-top:2px}
.review-card p{font-size:14px;color:var(--text-2)}

.update-card{
  max-width:760px;margin:44px auto 0;background:var(--card);
  border:1px solid var(--border);border-radius:var(--radius);padding:36px;
}
.update-head{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;padding-bottom:16px;border-bottom:1px solid var(--border)}
.update-ver{font-size:26px;font-weight:800;color:var(--primary)}
.update-date{color:var(--text-2);font-size:14px}
.update-list{margin-top:8px}
.update-list li{display:flex;gap:10px;padding:10px 0;font-size:15px;border-bottom:1px dashed var(--border)}
.update-list li:last-child{border-bottom:0}
.update-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary);margin-top:9px;flex-shrink:0}

.faq{max-width:820px;margin:44px auto 0}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:14px;transition:border-color .3s,box-shadow .3s}
.faq-item.open{border-color:var(--primary);box-shadow:0 8px 24px rgba(232,67,74,.10)}
.faq-q{
  width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:18px 22px;background:none;border:none;cursor:pointer;
  font-size:16px;font-weight:600;color:var(--text);text-align:left;
}
.faq-icon{position:relative;width:20px;height:20px;flex-shrink:0}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--primary);border-radius:2px;transition:transform .3s,opacity .3s}
.faq-icon::before{width:2px;height:18px;left:9px;top:1px}
.faq-icon::after{width:18px;height:2px;top:9px;left:1px}
.faq-item.open .faq-icon::before{transform:rotate(90deg);opacity:0}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .35s ease}
.faq-item.open .faq-a{grid-template-rows:1fr}
.faq-a-inner{overflow:hidden}
.faq-a-inner p{padding:0 22px 20px;color:var(--text-2);font-size:15px}

.download{
  background:linear-gradient(150deg,#1C1E26 0%,#2B2436 100%);color:#fff;
  text-align:center;padding:84px 0;
}
.download h1{font-size:34px;font-weight:800;letter-spacing:1px}
.dl-meta{margin:14px 0 32px;color:rgba(255,255,255,.75);font-size:14px;letter-spacing:.5px}
.dl-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.dl-tip{margin-top:26px;color:rgba(255,255,255,.85);font-size:15px}

.footer{background:#14151A;color:rgba(255,255,255,.6);text-align:center;padding:30px 0;font-size:13px}
.footer-brand{color:#fff;font-weight:700;font-size:16px;display:inline-block;margin-bottom:6px;padding:6px 0;transition:color .2s}
.footer-brand:hover{color:var(--primary)}

.to-top{
  position:fixed;right:24px;bottom:28px;width:46px;height:46px;border-radius:50%;
  background:var(--primary);color:#fff;border:none;cursor:pointer;z-index:99;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 20px rgba(232,67,74,.35);
  opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .3s,transform .3s,background .2s;
}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--primary-dark)}
.to-top svg{width:20px;height:20px}

@media (max-width:1024px){
  .section{padding:64px 0}
  .hero{padding:calc(var(--nav-h) + 36px) 0 60px}
  .hero-inner{gap:36px}
  .hero h1{font-size:34px}
  .hero-img{max-width:320px}
}

@media (max-width:900px){
  .nav-links{display:none}
  .works-grid,.features-grid,.reviews-grid{grid-template-columns:repeat(2,1fr)}
  .cmp{grid-template-columns:88px repeat(3,1fr)}
  .cmp-label,.cmp-cell{padding:14px 8px;font-size:13px}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .section{padding:56px 0}
  .sec-title{font-size:24px}
  .sec-sub{font-size:14px}
  .hero{padding:calc(var(--nav-h) + 24px) 0 48px}
  .hero-inner{flex-direction:column;gap:30px;text-align:center}
  .hero h1{font-size:27px}
  .hero-desc{font-size:15px;margin:16px auto 24px;text-align:center}
  .hero-btns{flex-direction:column;width:100%;gap:12px}
  .hero-btns .btn{width:100%;padding:14px}
  .hero-points{justify-content:center}
  .hero-img{max-width:280px;margin:0 auto}
  .works-grid,.features-grid,.reviews-grid{grid-template-columns:1fr;gap:18px;margin-top:32px}
  .intro-points{grid-template-columns:1fr;gap:16px;margin-top:28px}
  .stats{padding:56px 0}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:28px;margin-top:32px}
  .stat-num{font-size:32px}
  .cmp{margin-top:32px}
  .update-card{padding:24px;margin-top:32px}
  .update-ver{font-size:22px}
  .faq{margin-top:32px}
  .faq-q{font-size:15px;padding:16px 18px}
  .faq-a-inner p{padding:0 18px 18px;font-size:14px}
  .download{padding:60px 0}
  .download h1{font-size:24px}
  .dl-meta{font-size:12px;white-space:nowrap;margin:12px 0 24px}
  .dl-btns{flex-direction:column;width:100%;gap:12px}
  .dl-btns .btn{width:100%;padding:14px}
  .dl-tip{font-size:14px}
  .nav-inner{justify-content:space-between}
  .logo{font-size:22px}
  .nav-btn{padding:6px 12px;font-size:12px}
  .hero-points li{font-size:14px}
  .to-top{right:20px;bottom:20px;width:42px;height:42px}
}

@media (max-width:480px){
  .cmp{grid-template-columns:64px repeat(3,1fr)}
  .cmp-label,.cmp-cell{padding:12px 4px;font-size:12px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .btn,.work-card,.feature-card,.intro-point,.review-card,.nav,.to-top,.faq-icon::before,.faq-icon::after{transition:none}
}