:root{
  --primary:#FF6A2B;
  --primary-dark:#F25A1A;
  --primary-light:#FFF1E8;
  --dark:#16161A;
  --text:#33333B;
  --text-light:#66666E;
  --border:#ECECF1;
  --bg:#F7F8FB;
  --card:#FFFFFF;
  --radius:16px;
  --shadow:0 4px 18px rgba(22,22,26,.06);
  --shadow-hover:0 12px 32px rgba(255,106,43,.16);
  --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",sans-serif;color:var(--text);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
img{display:block;width:100%;height:auto}
a{text-decoration:none;color:inherit}
button{font-family:inherit;border:none;background:none;cursor:pointer}
section[id]{scroll-margin-top:calc(var(--nav-h) + 16px)}

.nav{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 6px 24px rgba(22,22,26,.08)}
.nav-inner{max-width:1200px;margin:0 auto;height:100%;padding:0 24px;display:flex;align-items:center;gap:20px}
.logo{font-size:22px;font-weight:800;color:var(--primary);letter-spacing:1px;white-space:nowrap}
.nav-links{display:flex;gap:2px;margin-left:auto}
.nav-links a{padding:8px 12px;font-size:14px;color:var(--text-light);border-radius:8px;white-space:nowrap;transition:color .2s,background .2s}
.nav-links a:hover{color:var(--primary);background:var(--primary-light)}
.nav-btn{margin-left:12px;padding:8px 18px;font-size:13px;font-weight:700;color:#fff;background:var(--primary);border-radius:999px;white-space:nowrap;transition:background .25s,transform .25s,box-shadow .25s}
.nav-btn:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 16px rgba(255,106,43,.35)}

.hero{padding:calc(var(--nav-h) + 56px) 0 72px;background:linear-gradient(180deg,var(--primary-light) 0%,#fff 70%)}
.hero-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:56px}
.hero-text{flex:1 1 0;min-width:0}
.hero h1{font-size:44px;line-height:1.25;color:var(--dark);font-weight:800}
.hero .ver{color:var(--primary)}
.hero-desc{margin:20px 0 32px;font-size:16px;line-height:1.9;color:var(--text-light);max-width:540px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 32px;border-radius:999px;font-size:16px;font-weight:700;line-height:1.4;text-align:center;transition:.25s}
.btn-primary{color:#fff;background:var(--primary);box-shadow:0 8px 20px rgba(255,106,43,.3)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 12px 28px rgba(255,106,43,.4)}
.btn-outline{color:var(--primary);background:#fff;border:2px solid var(--primary)}
.btn-outline:hover{color:#fff;background:var(--primary);transform:translateY(-2px)}
.hero-img{flex:1 1 0;max-width:420px;min-width:0}
.hero-img img{border-radius:20px;box-shadow:0 24px 60px rgba(255,106,43,.22)}

.section{padding:88px 0}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section h2{font-size:32px;font-weight:800;color:var(--dark);text-align:center}
.sub{margin:12px 0 44px;font-size:15px;color:var(--text-light);text-align:center}

.preview{background:var(--bg)}
.preview-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.preview-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .3s,box-shadow .3s}
.preview-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-hover)}

.intro-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:center}
.intro-text p{font-size:15px;line-height:2;color:var(--text-light);margin-bottom:18px}
.intro-card{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);border-radius:20px;padding:32px 28px;color:#fff;box-shadow:0 20px 48px rgba(255,106,43,.28)}
.intro-card ul{list-style:none}
.intro-card li{display:flex;align-items:flex-start;gap:12px;padding:14px 0;font-size:15px;line-height:1.6;border-bottom:1px solid rgba(255,255,255,.16)}
.intro-card li:last-child{border-bottom:none}
.intro-card li span{flex-shrink:0;width:22px;height:22px;margin-top:2px;border-radius:50%;background:rgba(255,255,255,.22);font-size:13px;line-height:22px;text-align:center}

.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 26px;transition:transform .3s,box-shadow .3s,border-color .3s}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:rgba(255,106,43,.3)}
.feature-icon{width:52px;height:52px;margin-bottom:16px;border-radius:14px;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:24px}
.feature-card h3{font-size:18px;font-weight:700;color:var(--dark);margin-bottom:8px}
.feature-card p{font-size:14px;line-height:1.8;color:var(--text-light)}

.compare{background:var(--bg)}
.compare-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.compare-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;transition:transform .3s,box-shadow .3s}
.compare-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.compare-card h3{font-size:16px;font-weight:700;color:var(--dark);margin-bottom:14px;padding-left:12px;border-left:4px solid var(--primary)}
.compare-side{border-radius:12px;padding:12px 16px;margin-bottom:10px}
.compare-side:last-child{margin-bottom:0}
.compare-side.win{background:var(--primary-light);border:1px solid rgba(255,106,43,.28)}
.compare-side.lose{background:var(--bg);border:1px solid var(--border)}
.side-name{font-size:14px;font-weight:700;color:var(--dark)}
.compare-side.win .side-name{color:var(--primary)}
.compare-side p{font-size:13px;color:var(--text-light);margin-top:4px}

.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.stat-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:36px 20px;text-align:center;transition:transform .3s,box-shadow .3s}
.stat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.stat-num{font-size:38px;font-weight:800;color:var(--primary);line-height:1.2}
.stat-label{margin-top:10px;font-size:14px;color:var(--text-light)}

.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.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-hover)}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{width:44px;height:44px;flex-shrink:0;border-radius:50%;background:var(--primary);color:#fff;font-size:18px;font-weight:700;display:flex;align-items:center;justify-content:center}
.review-info{display:flex;flex-direction:column;gap:2px}
.review-name{font-size:15px;font-weight:700;color:var(--dark)}
.review-stars{font-size:14px;color:#FFB400;letter-spacing:2px}
.review-text{font-size:14px;line-height:1.8;color:var(--text-light)}

.version{background:var(--bg)}
.version-card{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 32px;box-shadow:var(--shadow)}
.version-head{display:flex;align-items:center;gap:16px;margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.version-badge{font-size:20px;font-weight:800;color:#fff;background:var(--primary);padding:6px 18px;border-radius:999px;letter-spacing:1px}
.version-date{font-size:14px;color:var(--text-light)}
.version-list{list-style:none}
.version-list li{position:relative;padding:9px 0 9px 24px;font-size:15px;color:var(--text);line-height:1.7}
.version-list li::before{content:"";position:absolute;left:6px;top:17px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:14px;overflow:hidden;transition:border-color .3s,box-shadow .3s}
.faq-item.active{border-color:var(--primary);box-shadow:0 8px 24px rgba(255,106,43,.12)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 24px;font-size:16px;font-weight:700;color:var(--dark);text-align:left;transition:color .2s}
.faq-q:hover{color:var(--primary)}
.faq-icon{position:relative;flex-shrink:0;width:20px;height:20px}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;top:50%;left:50%;background:var(--primary);border-radius:2px;transform:translate(-50%,-50%);transition:transform .3s,opacity .3s}
.faq-icon::before{width:14px;height:2px}
.faq-icon::after{width:2px;height:14px}
.faq-item.active .faq-icon::after{transform:translate(-50%,-50%) rotate(90deg);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a-inner{padding:0 24px 22px;font-size:14px;line-height:1.9;color:var(--text-light)}

.download{padding:96px 0;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);text-align:center;color:#fff}
.download h1{font-size:38px;font-weight:800;color:#fff}
.download h1 .ver{color:#FFE9DC}
.download-meta{display:flex;justify-content:center;gap:24px;margin:18px 0 36px;font-size:14px;opacity:.92}
.download-btns{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}
.download-btns .btn{padding:15px 36px}
.btn-light{color:var(--primary);background:#fff}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,0,0,.2)}
.btn-dark{color:#fff;background:var(--dark);border:2px solid rgba(255,255,255,.35)}
.btn-dark:hover{transform:translateY(-2px);background:#2A2A30;box-shadow:0 12px 28px rgba(0,0,0,.25)}
.download-tip{margin-top:28px;font-size:15px;opacity:.95}

.footer{padding:40px 24px;background:var(--dark);text-align:center}
.footer-text{font-size:13px;color:rgba(255,255,255,.65)}
.footer-text a{color:#fff;transition:opacity .2s}
.footer-text a:hover{opacity:.8}

.back-top{position:fixed;right:24px;bottom:32px;z-index:90;width:46px;height:46px;border-radius:50%;background:var(--primary);color:#fff;font-size:20px;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(255,106,43,.35);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .3s,visibility .3s,transform .3s,background .3s}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--primary-dark)}

@media (max-width:1024px){
  .hero h1{font-size:36px}
  .hero-inner{gap:36px}
  .preview-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .intro-grid{gap:32px}
}
@media (max-width:768px){
  .nav-inner{padding:0 20px;gap:12px}
  .logo{font-size:19px}
  .nav-links{display:none}
  .nav-btn{margin-left:auto;padding:7px 14px}
  .hero{padding:calc(var(--nav-h) + 28px) 0 44px}
  .hero-inner{flex-direction:column;gap:32px;padding:0 20px}
  .hero-text{text-align:center}
  .hero h1{font-size:30px}
  .hero-desc{margin:16px auto 28px;font-size:15px}
  .hero-btns{flex-direction:column;width:100%;gap:14px}
  .hero-btns .btn{width:100%}
  .hero-img{max-width:280px}
  .section{padding:56px 0}
  .container{padding:0 20px}
  .section h2{font-size:26px}
  .sub{margin:10px 0 32px;font-size:14px}
  .preview-grid,.features-grid,.stats-grid,.compare-grid,.reviews-grid{grid-template-columns:1fr;gap:16px}
  .intro-grid{grid-template-columns:1fr;gap:28px}
  .intro-card{padding:24px 20px}
  .version-card{padding:22px 20px}
  .version-head{flex-direction:column;align-items:flex-start;gap:10px}
  .faq-q{padding:16px 18px;font-size:15px}
  .faq-a-inner{padding:0 18px 18px}
  .download{padding:64px 0}
  .download h1{font-size:28px}
  .download-meta{margin:14px 0 28px;font-size:12px;gap:12px;white-space:nowrap}
  .download-btns{flex-direction:column;gap:14px}
  .download-btns .btn{width:100%}
  .download-tip{font-size:14px}
  .back-top{right:16px;bottom:24px}
}