*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
:root{
  --primary:#E60012;
  --primary-deep:#C4000F;
  --dark:#20242C;
  --border:#ECEEF2;
  --bg:#F7F8FA;
  --card:#FFFFFF;
  --text:#23272E;
  --text-sub:#5B636F;
  --radius:16px;
  --shadow:0 12px 30px rgba(32,36,44,.10);
  --primary-soft:rgba(230,0,18,.08);
  --text-dim:#9AA3B0;
}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{display:block;width:100%;height:auto}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
section{scroll-margin-top:72px}

/* ===== 顶部导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:#fff;border-bottom:1px solid var(--border);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 6px 18px rgba(32,36,44,.07)}
.nav-inner{display:flex;align-items:center;height:64px;gap:24px}
.logo{font-size:22px;font-weight:800;color:var(--text);white-space:nowrap;letter-spacing:1px}
.logo span{color:var(--primary)}
.nav-menu{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-menu a{font-size:14px;color:var(--text-sub);padding:7px 10px;border-radius:8px;transition:color .2s,background .2s}
.nav-menu a:hover{color:var(--primary);background:var(--primary-soft)}
.nav-menu a.active{color:var(--primary);font-weight:700}
.btn-download{font-size:13px;font-weight:700;color:#fff;background:var(--primary);padding:7px 15px;border-radius:9px;white-space:nowrap;transition:background .2s,transform .2s}
.btn-download:hover{background:var(--primary-deep);transform:translateY(-1px)}

/* ===== 首屏Hero ===== */
.hero{padding:148px 0 84px;background:linear-gradient(#fff,var(--bg))}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.hero h1{font-size:46px;line-height:1.3;font-weight:800;color:var(--text);letter-spacing:1px}
.hero h1 .ver,.download h1 .ver{color:var(--primary)}
.hero-desc{margin:22px 0 34px;font-size:17px;color:var(--text-sub);max-width:560px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 32px;border-radius:12px;font-size:16px;font-weight:700;text-align:center;transition:transform .25s,box-shadow .25s,background .25s,border-color .25s}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 22px rgba(230,0,18,.24)}
.btn-primary:hover{background:var(--primary-deep);transform:translateY(-2px)}
.btn-outline{background:#fff;color:var(--text);border:1.5px solid var(--border)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-2px)}
.hero-pic img{border-radius:20px;box-shadow:0 24px 60px rgba(32,36,44,.18)}

/* ===== 通用区块 ===== */
.work-card,.intro-card,.feat-card,.compare-wrap,.review-card,.update-card,.faq-item{background:var(--card);border:1px solid var(--border)}
.section{padding:88px 0}
.section-title{font-size:34px;font-weight:800;color:var(--text);text-align:center;margin-bottom:14px;letter-spacing:.5px}
.section-sub{font-size:15px;color:var(--text-sub);text-align:center;margin-bottom:48px}

/* ===== 作品预览 ===== */
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.work-card{border-radius:var(--radius);overflow:hidden;transition:transform .3s,box-shadow .3s}
.work-card:hover,.feat-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}

/* ===== 产品介绍 ===== */
.intro-card{border-radius:22px;padding:52px 56px;max-width:920px;margin:0 auto}
.intro-card p{font-size:16px;color:var(--text-sub);margin-bottom:18px}
.intro-card p:last-child{margin-bottom:0}
.intro-card strong{color:var(--primary)}

/* ===== 核心功能 ===== */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feat-card{border-radius:var(--radius);padding:34px 30px;transition:transform .3s,box-shadow .3s}
.feat-icon{width:54px;height:54px;border-radius:15px;background:var(--primary-soft);color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:20px}
.feat-icon svg{width:27px;height:27px}
.feat-title{font-size:18px;font-weight:700;margin-bottom:10px}
.feat-desc{font-size:14.5px;color:var(--text-sub)}

/* ===== 优势对比 ===== */
.compare-wrap{border-radius:20px;overflow:hidden}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.compare-table{width:100%;min-width:640px;table-layout:fixed;border-collapse:collapse;text-align:left}
.compare-table th:nth-child(1){width:22%}
.compare-table th:nth-child(2){width:39%}
.compare-table th:nth-child(3){width:39%}
.compare-table th,.compare-table td{padding:17px 22px;font-size:15px;border-bottom:1px solid var(--border)}
.compare-table thead th{background:var(--dark);color:#fff;font-weight:600;border-bottom:none}
.compare-table tbody tr:last-child td{border-bottom:none}
.col-us{background:var(--primary-soft);color:var(--primary-deep);font-weight:700}
.col-them{background:#F4F6F8;color:var(--text-sub)}
.compare-hint{display:none;margin-top:14px;text-align:center;font-size:14px;color:var(--text-sub)}

/* ===== 平台数据 ===== */
.stats{background:var(--dark)}
.stats .section-title{color:#fff}
.stats .section-sub{color:var(--text-dim)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius);padding:38px 20px;text-align:center;transition:transform .3s,background .3s}
.stat-card:hover{transform:translateY(-6px);background:rgba(255,255,255,.09)}
.stat-num{font-size:42px;font-weight:800;color:#fff;line-height:1.2}
.stat-num span{color:var(--primary)}
.stat-label{margin-top:10px;font-size:14px;color:var(--text-dim)}

/* ===== 用户评价 ===== */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{border-radius:var(--radius);padding:28px}
.review-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.avatar{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;color:#fff;flex-shrink:0}
.avatar.a1{background:#E60012}
.avatar.a2{background:#3B6FE0}
.avatar.a3{background:#0FA47A}
.avatar.a4{background:#E8890C}
.avatar.a5{background:#8A5BD6}
.avatar.a6{background:#2A9DBF}
.review-name{font-size:15.5px;font-weight:700}
.stars{color:#FFB800;font-size:13px;letter-spacing:2px;margin-top:2px}
.review-text{font-size:14.5px;color:var(--text-sub);line-height:1.75}

/* ===== 版本更新 ===== */
.update-card{max-width:780px;margin:0 auto;border-radius:20px;padding:44px 50px}
.update-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding-bottom:22px;border-bottom:1px solid var(--border)}
.update-ver{font-size:22px;font-weight:800;color:var(--primary)}
.badge{display:inline-block;font-size:12px;font-weight:700;color:#fff;background:var(--primary);padding:3px 10px;border-radius:20px;vertical-align:3px;margin-left:8px}
.update-date{font-size:14px;color:var(--text-sub)}
.update-list{list-style:none;padding-top:14px}
.update-list li{position:relative;padding:10px 0 10px 26px;font-size:15px}
.update-list li::before{content:"";position:absolute;left:4px;top:19px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

/* ===== FAQ ===== */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{border-radius:14px;margin-bottom:14px;overflow:hidden;transition:box-shadow .3s}
.faq-item:hover{box-shadow:0 8px 22px rgba(32,36,44,.06)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;padding:20px 24px;background:none;border:none;cursor:pointer;font-size:16px;font-weight:600;color:var(--text);text-align:left;font-family:inherit}
.faq-icon{flex-shrink:0;width:26px;height:26px;border-radius:8px;background:var(--primary-soft);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;transition:transform .3s}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 24px 22px;font-size:14.5px;color:var(--text-sub)}

/* ===== 下载区域 ===== */
.download{background:var(--dark);padding:92px 0;text-align:center}
.download h1{font-size:38px;font-weight:800;color:#fff;letter-spacing:1px}
.dl-meta{margin:18px 0 38px;font-size:14px;color:var(--text-dim)}
.dl-btns{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-bottom:22px}
.dl-btn{min-width:260px}
.btn-ios{background:#fff;color:var(--dark);box-shadow:0 8px 22px rgba(0,0,0,.18)}
.btn-ios:hover{background:#F1F2F4;transform:translateY(-2px)}
.dl-tip{font-size:14px;color:var(--text-dim)}

/* ===== 底部页脚 ===== */
.footer{background:#171A20;padding:34px 0;text-align:center;font-size:14px;color:#828A96}
.foot-link{color:#CBD0D8;font-weight:600;transition:color .2s}
.foot-link:hover{color:#fff}

/* ===== 返回顶部 ===== */
.to-top{position:fixed;right:28px;bottom:32px;z-index:99;width:46px;height:46px;border:none;border-radius:50%;background:var(--primary);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(230,0,18,.32);opacity:0;visibility:hidden;transform:translateY(14px);transition:opacity .3s,transform .3s,visibility .3s}
.to-top svg{width:20px;height:20px}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--primary-deep)}

/* ===== 平板适配 ===== */
@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}
  .nav-menu a{padding:7px 7px;font-size:13px}
}
@media (max-width:860px){
  .nav-menu{display:none}
  .btn-download{margin-left:auto}
}

/* ===== 手机适配 ===== */
@media (max-width:768px){
  .container{padding:0 20px}
  .nav-inner{height:56px}
  .btn-download{padding:6px 13px;font-size:13px}
  .section{padding:60px 0}
  .section-title{font-size:27px}
  .section-sub{margin-bottom:34px;font-size:14px}
  .hero{padding:104px 0 56px}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero h1{font-size:31px}
  .hero-desc{font-size:15.5px;margin:16px 0 28px}
  .hero-btns{flex-direction:column;width:100%}
  .hero-btns .btn{width:100%}
  .works-grid{grid-template-columns:1fr;gap:20px}
  .features-grid{grid-template-columns:1fr;gap:18px}
  .feat-card{padding:28px 24px}
  .reviews-grid{grid-template-columns:1fr;gap:18px}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .stat-card{padding:26px 14px}
  .stat-num{font-size:32px}
  .intro-card{padding:30px 24px}
  .intro-card p{font-size:15px}
  .compare-hint{display:block}
  .update-card{padding:30px 24px}
  .update-ver{font-size:19px}
  .download{padding:64px 0}
  .download h1{font-size:27px}
  .dl-meta{margin:14px 0 28px;font-size:12px;white-space:nowrap}
  .dl-btns{flex-direction:column;width:100%;gap:14px}
  .dl-btn{width:100%;min-width:0}
  .dl-tip{font-size:14px}
  .to-top{right:18px;bottom:22px;width:42px;height:42px}
  .faq-q{padding:17px 18px;font-size:15px}
  .faq-a p{padding:0 18px 20px}
}