:root{
  --primary:#2E90FA;
  --primary-deep:#1E6FD8;
  --primary-light:#EAF4FF;
  --gradient:linear-gradient(135deg,#57B4FF,#2E90FA);
  --dark:#0F2035;
  --dark-2:#1A3050;
  --bg:#F5F9FE;
  --card:#FFFFFF;
  --border:#E3EDF8;
  --text:#1C2A3A;
  --muted:#5C6E82;
  --gold:#FFB400;
  --ok:#1FA46E;
  --warn:#E09B2F;
  --no:#A0ADBB;
  --radius:16px;
  --shadow:0 6px 20px rgba(46,144,250,.10);
  --shadow-hover:0 14px 34px rgba(46,144,250,.20);
  --header-h:70px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 8px)}
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}
img{display:block;width:100%;height:auto;border:0}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;cursor:pointer}
a:focus-visible,button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

/* 通用 */
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:80px 0}
.section-white{background:#fff}
.section-head{text-align:center;margin-bottom:46px}
.section-head h2{font-size:32px;font-weight:800;color:var(--dark)}
.section-head p{color:var(--muted);margin-top:10px;font-size:15px}
.section-head.light h2{color:#fff}
.section-head.light p{color:#AFC3D9}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;font-weight:600;border-radius:999px;cursor:pointer;border:none;transition:transform .25s,box-shadow .25s,background .25s}
.btn-primary{background:var(--gradient);color:#fff;box-shadow:0 6px 16px rgba(46,144,250,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(46,144,250,.45)}

/* 头部导航 */
.header{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--header-h);background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.header.scrolled{box-shadow:0 4px 18px rgba(15,32,53,.08)}
.nav{max-width:1200px;margin:0 auto;height:100%;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:8px;font-size:21px;font-weight:800;color:var(--dark);flex:none}
.logo-icon{width:30px;height:30px;border-radius:9px;background:var(--gradient);display:flex;align-items:center;justify-content:center;flex:none;box-shadow:0 3px 8px rgba(46,144,250,.3)}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{padding:7px 12px;font-size:14px;color:var(--muted);border-radius:8px;white-space:nowrap;transition:color .25s,background .25s}
.nav-links a:hover{color:var(--primary);background:var(--primary-light)}
.nav-links a.active{color:var(--primary);font-weight:600}
.nav-btn{padding:5px 14px;font-size:13px}

/* Hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#E7F2FF 0%,#F5F9FE 100%);padding:calc(var(--header-h) + 46px) 0 76px}
.hero::before{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(46,144,250,.14),transparent 65%);top:-160px;right:-80px}
.hero::after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(87,180,255,.12),transparent 65%);bottom:-150px;left:-100px}
.hero-inner{position:relative;z-index:1;max-width:1200px;margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:56px}
.hero-text{flex:1}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:999px;background:rgba(46,144,250,.1);color:var(--primary-deep);font-size:13px;font-weight:600;margin-bottom:20px}
.hero-badge::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--primary)}
.hero h1{font-size:46px;font-weight:800;color:var(--dark);line-height:1.3;letter-spacing:1px}
.ver-tag{display:inline-block;margin-left:6px;padding:4px 14px;border-radius:999px;background:var(--gradient);color:#fff;font-size:17px;font-weight:700;vertical-align:middle;box-shadow:0 4px 12px rgba(46,144,250,.35)}
.hero-desc{margin-top:22px;font-size:16px;color:var(--muted);max-width:560px;line-height:1.9}
.hero-btns{display:flex;gap:16px;margin-top:34px}
.hero-btn{padding:14px 30px;font-size:16px}
.btn-ghost{background:#fff;color:var(--primary);border:1.5px solid var(--primary);box-shadow:0 4px 12px rgba(46,144,250,.12)}
.btn-ghost:hover{transform:translateY(-2px);background:var(--primary-light);box-shadow:0 8px 20px rgba(46,144,250,.22)}
.hero-img{flex:0 0 300px}
.hero-img img{border-radius:20px;box-shadow:var(--shadow-hover)}

/* 作品预览 */
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.work-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.work-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}

/* 产品介绍 */
.intro-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:42px;box-shadow:var(--shadow)}
.intro-p{font-size:15px;color:var(--muted);line-height:2;margin-bottom:16px}
.intro-p:last-of-type{margin-bottom:26px}
.intro-points{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.intro-points li{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:600;color:var(--dark)}
.point-icon{width:24px;height:24px;border-radius:50%;background:var(--gradient);display:flex;align-items:center;justify-content:center;flex:none}
.point-icon::after{content:"";width:10px;height:5px;border-left:2.5px solid #fff;border-bottom:2.5px solid #fff;transform:rotate(-45deg) translateY(-1px)}

/* 核心功能 */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 26px;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.feature-icon{width:54px;height:54px;border-radius:14px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feature-icon svg{width:26px;height:26px}
.feature-card h3{font-size:18px;color:var(--dark);margin-bottom:10px}
.feature-card p{font-size:14px;color:var(--muted);line-height:1.8}

/* 优势对比 */
.compare-wrap{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto;box-shadow:var(--shadow)}
.compare-table{width:100%;border-collapse:collapse}
.compare-table th,.compare-table td{padding:15px 18px;text-align:center;border-bottom:1px solid var(--border);font-size:14px}
.compare-table thead th{font-weight:700;white-space:nowrap}
.compare-table thead th:first-child{background:var(--dark);color:#fff}
.compare-table thead th:nth-child(2){background:var(--gradient);color:#fff}
.compare-table thead th:not(:first-child):not(:nth-child(2)){background:#F0F5FB;color:var(--muted)}
.compare-table tbody td:first-child{text-align:left;font-weight:600;color:var(--text);white-space:nowrap}
.compare-table tbody td:nth-child(2){background:#F4FAFF}
.compare-table tbody tr:hover td{background:#F0F7FF}
.badge{display:inline-flex;padding:3px 12px;border-radius:999px;font-size:12px;font-weight:600;white-space:nowrap}
.badge-ok{background:#E4F7EE;color:var(--ok)}
.badge-part{background:#FDF1DE;color:var(--warn)}
.badge-no{background:#EEF2F7;color:var(--no)}

/* 平台数据 */
.stats{background:linear-gradient(135deg,var(--dark),var(--dark-2))}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.stat-item{text-align:center;padding:22px 10px;border-radius:var(--radius);transition:background .3s}
.stat-item:hover{background:rgba(255,255,255,.05)}
.stat-num{font-size:46px;font-weight:800;background:linear-gradient(135deg,#6EC1FF,#2E90FA);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.2}
.stat-label{color:#AFC3D9;margin-top:8px;font-size:15px}

/* 用户评价 */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);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}
.avatar{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:18px;flex:none}
.av-1{background:linear-gradient(135deg,#57B4FF,#2E90FA)}
.av-2{background:linear-gradient(135deg,#38C98B,#1FA46E)}
.av-3{background:linear-gradient(135deg,#9A7BFF,#6C4FE0)}
.av-4{background:linear-gradient(135deg,#FF9A5A,#F2763B)}
.av-5{background:linear-gradient(135deg,#FF7AB8,#E5489B)}
.av-6{background:linear-gradient(135deg,#3ECFDB,#12A5B0)}
.review-user .name{font-weight:700;font-size:15px;color:var(--dark)}
.stars{color:var(--gold);font-size:13px;letter-spacing:2px;margin-top:2px}
.review-text{margin-top:14px;font-size:14px;color:var(--muted);line-height:1.8}

/* 版本更新 */
.update-card{max-width:820px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:36px 40px;box-shadow:var(--shadow)}
.update-top{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:22px;padding-bottom:20px;border-bottom:1px solid var(--border)}
.ver-badge{padding:6px 18px;border-radius:999px;background:var(--gradient);color:#fff;font-weight:800;font-size:16px;box-shadow:0 4px 12px rgba(46,144,250,.35)}
.update-date{color:var(--muted);font-size:14px}
.update-list li{position:relative;padding:10px 0 10px 26px;font-size:14.5px;color:var(--text)}
.update-list li::before{content:"";position:absolute;left:4px;top:20px;width:8px;height:8px;border-radius:50%;background:var(--primary)}
.update-list li::after{content:"";position:absolute;left:7px;top:28px;bottom:-4px;width:2px;background:var(--border)}
.update-list li:last-child::after{display:none}

/* FAQ */
.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,border-color .3s}
.faq-item.open{border-color:var(--primary);box-shadow:var(--shadow)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;background:none;border:none;font-size:16px;font-weight:600;color:var(--dark);text-align:left}
.faq-icon{width:26px;height:26px;border-radius:50%;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:18px;line-height:1;flex:none;transition:transform .3s,background .3s,color .3s}
.faq-item.open .faq-icon{transform:rotate(45deg);background:var(--primary);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 22px 20px;font-size:14px;color:var(--muted);line-height:1.9}

/* 下载区域 */
.download{background:linear-gradient(180deg,#E7F2FF 0%,#F5F9FE 100%)}
.download-card{max-width:860px;margin:0 auto;position:relative;overflow:hidden;background:linear-gradient(135deg,var(--dark),var(--dark-2));border-radius:24px;padding:58px 40px;text-align:center;color:#fff;box-shadow:0 18px 44px rgba(15,32,53,.28)}
.download-card::before{content:"";position:absolute;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(110,193,255,.25),transparent 65%);top:-150px;right:-110px}
.download-card::after{content:"";position:absolute;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(87,180,255,.16),transparent 65%);bottom:-140px;left:-100px}
.download-card>*{position:relative;z-index:1}
.download-card h1{font-size:36px;font-weight:800;letter-spacing:1px}
.download-card .ver-tag{font-size:15px}
.download-meta{color:#AFC3D9;font-size:14px;margin-top:16px;display:flex;justify-content:center;align-items:center;gap:12px}
.meta-sep{opacity:.5}
.download-btns{display:flex;justify-content:center;gap:18px;margin-top:32px}
.dl-btn{padding:16px 38px;font-size:16px}
.dl-android{background:var(--gradient);color:#fff;box-shadow:0 8px 20px rgba(46,144,250,.45)}
.dl-android:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(46,144,250,.55)}
.dl-ios{background:#fff;color:var(--dark);box-shadow:0 8px 20px rgba(0,0,0,.22)}
.dl-ios:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,0,0,.3)}
.download-tip{margin-top:26px;font-size:14px;color:#AFC3D9}

/* 页脚 */
.footer{background:var(--dark);color:#8FA5BC;padding:34px 0;text-align:center;font-size:13px}
.footer a{color:#fff;font-weight:600}
.footer a:hover{color:#6EC1FF}

/* 返回顶部 */
.back-top{position:fixed;right:26px;bottom:30px;width:46px;height:46px;border-radius:50%;background:var(--primary);color:#fff;border:none;font-size:20px;line-height:1;box-shadow:0 8px 20px rgba(46,144,250,.4);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .3s,transform .3s,visibility .3s;z-index:90}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--primary-deep)}

/* 平板 */
@media (max-width:1024px){
  .nav-links{display:none}
  .hero-inner{gap:36px}
  .hero h1{font-size:38px}
  .hero-img{flex:0 0 260px}
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
}

/* 手机 */
@media (max-width:768px){
  :root{--header-h:60px}
  .nav{padding:0 20px}
  .section{padding:56px 0}
  .container{padding:0 20px}
  .section-head{margin-bottom:34px}
  .section-head h2{font-size:26px}
  .hero{padding:calc(var(--header-h) + 22px) 0 48px}
  .hero-inner{flex-direction:column;gap:32px;padding:0 20px}
  .hero h1{font-size:30px}
  .ver-tag{font-size:15px}
  .hero-desc{font-size:15px}
  .hero-btns{flex-direction:column;gap:12px;margin-top:28px}
  .hero-btn{width:100%;padding:13px 20px;font-size:15px}
  .hero-img{flex:none;width:100%;max-width:340px;margin:0 auto}
  .works-grid{grid-template-columns:1fr;gap:20px}
  .intro-card{padding:26px 22px}
  .intro-points{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr;gap:16px}
  .feature-card{padding:26px 22px}
  .compare-table th,.compare-table td{padding:11px 8px;font-size:12px}
  .badge{padding:2px 9px;font-size:11px}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:18px}
  .stat-num{font-size:34px}
  .stat-label{font-size:14px}
  .reviews-grid{grid-template-columns:1fr;gap:16px}
  .update-card{padding:26px 22px}
  .update-list li{font-size:14px}
  .faq-q{padding:16px 18px;font-size:15px}
  .faq-a p{padding:0 18px 18px;font-size:13.5px}
  .download-card{padding:46px 20px}
  .download-card h1{font-size:28px}
  .download-meta{font-size:12px;gap:10px;white-space:nowrap}
  .download-btns{flex-direction:column;gap:14px;margin-top:26px}
  .dl-btn{width:100%;padding:14px 20px;font-size:15px}
  .download-tip{font-size:13px}
  .footer{padding:28px 0}
  .back-top{right:16px;bottom:22px}
}