:root {
  --pri: #1a3a6b;
  --pri2: #e8a825;
  --bg: #0d1b2e;
  --bg2: #111f36;
  --card: #152238;
  --text: #e8ecf1;
  --text2: #8fa3b8;
  --acc: #f0c040;
  --grad: linear-gradient(135deg, #1a3a6b 0%, #0d4a8a 50%, #1a3a6b 100%);
  --grad2: linear-gradient(135deg, #e8a825, #f5c842);
  --shadow: 0 4px 24px rgba(0,0,0,.35);
  --radius: 14px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden}
body::before{content:'';position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(ellipse at 20% 10%, rgba(26,58,107,.4) 0%, transparent 50%),radial-gradient(ellipse at 80% 80%, rgba(232,168,37,.12) 0%, transparent 50%);pointer-events:none;z-index:0}
.container{max-width:1200px;margin:0 auto;padding:0 24px;position:relative;z-index:1}
/* nav */
.nav{display:flex;justify-content:space-between;align-items:center;padding:20px 0;border-bottom:1px solid rgba(255,255,255,.06)}
.logo{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:700;letter-spacing:1px}
.logo .icon{width:42px;height:42px;background:var(--grad2);border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--bg);font-size:20px;font-weight:900}
.nav-links{display:flex;gap:32px;list-style:none}
.nav-links a{color:var(--text2);text-decoration:none;font-size:15px;transition:all .3s;position:relative}
.nav-links a:hover,.nav-links a.active{color:var(--acc)}
.nav-links a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--grad2);transition:width .3s}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
/* hero */
.hero{padding:80px 0 60px;text-align:center}
.hero .badge{display:inline-block;padding:6px 20px;border:1px solid rgba(232,168,37,.3);border-radius:50px;font-size:13px;color:var(--acc);margin-bottom:24px;letter-spacing:2px}
.hero h1{font-size:clamp(36px,5vw,56px);font-weight:800;margin-bottom:16px;line-height:1.2}
.hero h1 .hl{background:var(--grad2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero p{color:var(--text2);font-size:18px;max-width:600px;margin:0 auto 36px;line-height:1.7}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 36px;border-radius:50px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s;text-decoration:none;border:none}
.btn-pri{background:var(--grad2);color:var(--bg);box-shadow:0 6px 20px rgba(232,168,37,.3)}
.btn-pri:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(232,168,37,.4)}
.btn-out{background:transparent;border:1.5px solid rgba(255,255,255,.2);color:var(--text);margin-left:12px}
.btn-out:hover{border-color:var(--acc);color:var(--acc)}
/* features */
.features{padding:60px 0 80px}
.features h2{text-align:center;font-size:32px;margin-bottom:48px;font-weight:700}
.features h2 span{color:var(--acc)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
.card{background:var(--card);border-radius:var(--radius);padding:32px;border:1px solid rgba(255,255,255,.05);transition:all .35s;position:relative;overflow:hidden}
.card::before{content:'';position:absolute;top:0;left:0;width:100%;height:3px;background:var(--grad2);transform:scaleX(0);transform-origin:left;transition:transform .4s}
.card:hover::before{transform:scaleX(1)}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:rgba(232,168,37,.2)}
.card .icon{width:52px;height:52px;background:rgba(232,168,37,.1);border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:18px}
.card h3{font-size:18px;margin-bottom:10px;font-weight:600}
.card p{color:var(--text2);font-size:14px;line-height:1.7}
/* stats */
.stats{padding:40px 0 80px}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-item{background:var(--card);border-radius:var(--radius);padding:32px 16px;border:1px solid rgba(255,255,255,.05)}
.stat-num{font-size:36px;font-weight:800;background:var(--grad2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-label{color:var(--text2);font-size:14px;margin-top:6px}
/* cta */
.cta{margin:0 0 80px;text-align:center;padding:60px;background:var(--grad);border-radius:24px;position:relative;overflow:hidden}
.cta::before{content:'';position:absolute;top:-50%;right:-20%;width:300px;height:300px;background:radial-gradient(circle,rgba(232,168,37,.15) 0%,transparent 70%);border-radius:50%}
.cta h2{font-size:28px;margin-bottom:12px;position:relative}
.cta p{color:var(--text2);margin-bottom:28px;position:relative;font-size:15px}
.cta .btn-pri{background:var(--grad2);color:var(--bg);font-size:17px;padding:16px 44px;position:relative}
/* footer */
.footer{padding:40px 0;border-top:1px solid rgba(255,255,255,.06);text-align:center;color:var(--text2);font-size:13px}
/* download page */
.dl-page{padding:60px 0;text-align:center}
.dl-page h1{font-size:36px;margin-bottom:16px}
.dl-page h1 .hl{background:var(--grad2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.dl-page .sub{color:var(--text2);margin-bottom:40px;font-size:16px}
.dl-box{background:var(--card);border-radius:var(--radius);padding:48px;max-width:560px;margin:0 auto 32px;border:1px solid rgba(255,255,255,.08)}
.dl-box .platform{font-size:40px;margin-bottom:8px}
.dl-box h3{font-size:20px;margin-bottom:6px}
.dl-box .ver{color:var(--text2);font-size:14px;margin-bottom:24px}
.dl-box .size-info{color:var(--text2);font-size:13px;margin-top:12px}
/* 404 page */
.err-page{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:80vh;text-align:center;padding:40px 20px}
.err-num{font-size:clamp(80px,12vw,140px);font-weight:900;background:var(--grad2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}
.err-msg{font-size:22px;color:var(--text2);margin:16px 0 32px}
@media(max-width:768px){
  .nav-links{display:none}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .cta{padding:40px 24px}
  .hero{padding:50px 0 30px}
}