:root{
  --bg:#070b1a;
  --bg2:#0d1330;
  --card:#111936;
  --card2:#151f45;
  --line:rgba(255,255,255,.08);
  --txt:#eaf0ff;
  --muted:#9aa6c9;
  --brand:#4f7cff;
  --brand2:#00d4ff;
  --accent:#8b5cf6;
  --ok:#22d3a5;
  --warn:#fbbf24;
  --grad:linear-gradient(135deg,#4f7cff 0%,#00d4ff 50%,#8b5cf6 100%);
  --radius:18px;
  --shadow:0 20px 60px rgba(0,0,0,.45);
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--txt);font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:var(--brand2);text-decoration:none;transition:.25s}
a:hover{color:#fff}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* 背景装饰 */
.bg-deco{position:fixed;inset:0;z-index:-1;background:
 radial-gradient(900px 500px at 10% -5%,rgba(79,124,255,.25),transparent 60%),
 radial-gradient(800px 500px at 95% 0%,rgba(139,92,246,.22),transparent 55%),
 radial-gradient(700px 600px at 50% 110%,rgba(0,212,255,.16),transparent 60%),
 var(--bg)}
.grid-overlay{position:fixed;inset:0;z-index:-1;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:44px 44px;pointer-events:none}

/* 头部 */
header{position:sticky;top:0;z-index:50;background:rgba(7,11,26,.72);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:800;color:#fff}
.logo .mark{width:40px;height:40px;border-radius:12px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;box-shadow:0 6px 18px rgba(79,124,255,.5)}
.menu{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.menu a{color:var(--muted);padding:8px 14px;border-radius:10px;font-size:15px}
.menu a:hover{color:#fff;background:rgba(255,255,255,.06)}
.menu a.cta{background:var(--grad);color:#fff;font-weight:700;box-shadow:0 8px 20px rgba(0,212,255,.35)}
.menu a.cta:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(0,212,255,.5)}
.menu-btn{display:none;background:none;border:0;color:#fff;font-size:26px;cursor:pointer}

/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:999px;font-weight:700;font-size:16px;background:var(--grad);color:#fff;box-shadow:0 12px 30px rgba(0,212,255,.35);transition:.25s}
.btn:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(0,212,255,.55);color:#fff}
.btn.ghost{background:rgba(255,255,255,.08);border:1px solid var(--line);box-shadow:none}
.btn.ghost:hover{background:rgba(255,255,255,.14);box-shadow:none}
.btn.sm{padding:10px 20px;font-size:14px}

/* Hero */
.hero{position:relative;padding:90px 0 70px;text-align:center}
.hero .badge{display:inline-flex;align-items:center;gap:8px;padding:8px 18px;border-radius:999px;background:rgba(0,212,255,.12);border:1px solid rgba(0,212,255,.3);color:var(--brand2);font-size:14px;font-weight:600;margin-bottom:24px}
.hero h1{font-size:clamp(34px,6vw,62px);line-height:1.15;font-weight:900;margin-bottom:22px}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(16px,2.4vw,21px);color:var(--muted);max-width:760px;margin:0 auto 34px}
.hero .actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:40px}
.hero-stats{display:flex;gap:40px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.hero-stats .stat{text-align:center}
.hero-stats .num{font-size:34px;font-weight:900;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats .lbl{color:var(--muted);font-size:14px}
.hero-visual{margin:40px auto 0;max-width:900px;position:relative}
.hero-visual .screen{border-radius:20px;border:1px solid var(--line);box-shadow:var(--shadow);background:linear-gradient(160deg,#131b3e,#0c1230)}

/* 区块 */
section{padding:70px 0}
.sec-head{text-align:center;max-width:720px;margin:0 auto 48px}
.sec-head .kicker{display:inline-block;font-size:13px;letter-spacing:2px;text-transform:uppercase;color:var(--brand2);font-weight:700;margin-bottom:12px}
.sec-head h2{font-size:clamp(26px,4vw,40px);font-weight:900;margin-bottom:16px}
.sec-head p{color:var(--muted);font-size:17px}

/* 特性卡片 */
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.3s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-6px);border-color:rgba(0,212,255,.4);box-shadow:var(--shadow)}
.card .icon{width:54px;height:54px;border-radius:14px;background:rgba(79,124,255,.15);display:flex;align-items:center;justify-content:center;margin-bottom:18px;color:var(--brand2)}
.card h3{font-size:20px;margin-bottom:10px;font-weight:700}
.card p{color:var(--muted);font-size:15px}
.card .num-badge{position:absolute;top:18px;right:18px;font-size:13px;color:var(--brand2);font-weight:800}

/* 步骤 */
.steps{counter-reset:st;list-style:none;display:flex;flex-direction:column;gap:14px}
.steps li{position:relative;padding:16px 18px 16px 62px;background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:14px}
.steps li::before{counter-increment:st;content:counter(st);position:absolute;left:16px;top:50%;transform:translateY(-50%);width:34px;height:34px;border-radius:10px;background:var(--grad);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:15px}

/* FAQ */
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:16px;overflow:hidden}
.faq-item summary{cursor:pointer;padding:22px 26px;font-size:18px;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary .plus{flex-shrink:0;width:28px;height:28px;border-radius:8px;background:rgba(0,212,255,.15);color:var(--brand2);display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;transition:.25s}
.faq-item[open] summary .plus{transform:rotate(45deg)}
.faq-item .body{padding:0 26px 24px;color:var(--muted)}
.faq-item .body .q{margin-top:18px;font-weight:700;color:var(--txt)}

/* 分类标签 */
.chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:40px}
.chip{padding:10px 20px;border-radius:999px;background:var(--card);border:1px solid var(--line);color:var(--muted);font-size:15px;font-weight:600}
.chip:hover{border-color:rgba(0,212,255,.5);color:#fff}

/* 新闻 */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;display:flex;flex-direction:column}
.news-card:hover{transform:translateY(-6px);border-color:rgba(0,212,255,.4);box-shadow:var(--shadow)}
.news-card .thumb{height:180px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:40px;color:#fff;opacity:.9}
.news-card .thumb img{width:100%;height:100%;object-fit:cover}
.news-card .inner{padding:22px;display:flex;flex-direction:column;gap:10px;flex:1}
.news-card .meta{font-size:13px;color:var(--muted)}
.news-card h3{font-size:19px;line-height:1.4}
.news-card p{color:var(--muted);font-size:14px;flex:1}

/* 文章页 */
.article{max-width:820px;margin:0 auto}
.article h1{font-size:clamp(26px,4vw,40px);font-weight:900;line-height:1.3;margin:20px 0 16px}
.article .meta{display:flex;gap:20px;flex-wrap:wrap;color:var(--muted);font-size:14px;padding-bottom:20px;border-bottom:1px solid var(--line);margin-bottom:26px}
.article .content{color:#dbe4ff;font-size:17px}
.article .content h2{font-size:24px;font-weight:800;margin:32px 0 14px}
.article .content p{margin-bottom:16px}
.article .content ul,.article .content ol{margin:0 0 16px 24px}
.article .content li{margin-bottom:8px}
.article figure{margin:24px 0}
.article figure img{border-radius:14px;border:1px solid var(--line)}
.article figure figcaption{color:var(--muted);font-size:13px;margin-top:8px;text-align:center}

/* 面包屑 */
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:14px;color:var(--muted);padding:18px 0}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--brand2)}
.breadcrumb .sep{opacity:.5}

/* 下载卡片 */
.dl-panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:36px;text-align:center;max-width:640px;margin:0 auto}
.dl-panel .big{font-size:22px;font-weight:800;margin-bottom:8px}
.dl-panel .ver{color:var(--muted);margin-bottom:22px}
.dl-panel .platforms{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* 页脚 */
footer{margin-top:60px;border-top:1px solid var(--line);background:rgba(0,0,0,.25);padding:60px 0 30px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:40px}
.foot-grid h4{font-size:16px;margin-bottom:16px}
.foot-grid a{display:block;color:var(--muted);font-size:14px;margin-bottom:10px}
.foot-grid a:hover{color:#fff}
.foot-bottom{border-top:1px solid var(--line);padding-top:24px;text-align:center;color:var(--muted);font-size:13px}
.foot-bottom .sitemap-link{margin-bottom:12px}
.foot-bottom a{color:var(--brand2)}

/* 响应式 */
@media(max-width:960px){
 .g3,.g4{grid-template-columns:repeat(2,1fr)}
 .news-grid{grid-template-columns:repeat(2,1fr)}
 .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
 .menu{display:none;position:absolute;top:70px;left:0;right:0;background:var(--bg2);flex-direction:column;padding:16px;border-bottom:1px solid var(--line)}
 .menu.open{display:flex}
 .menu-btn{display:block}
 .g2,.g3,.g4{grid-template-columns:1fr}
 .news-grid{grid-template-columns:1fr}
 .foot-grid{grid-template-columns:1fr}
 .hero{padding:60px 0 50px}
 section{padding:50px 0}
}