/* ============ 基础变量 ============ */
:root{
  --bg:#0b0e1a;
  --bg-2:#11152480;
  --surface:#141a2e;
  --surface-2:#1b2238;
  --border:#262f4a;
  --text:#e8ecf6;
  --muted:#9aa4c0;
  --primary:#7c5cff;
  --primary-2:#22d3ee;
  --grad:linear-gradient(120deg,#7c5cff 0%,#22d3ee 100%);
  --radius:16px;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:999px;font-weight:600;font-size:15px;cursor:pointer;
  border:1px solid transparent;transition:.25s;white-space:nowrap}
.btn-lg{padding:14px 30px;font-size:16px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(124,92,255,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(124,92,255,.5)}
.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--primary);color:#fff;background:var(--bg-2)}

/* ============ 顶部导航 ============ */
.site-header{position:sticky;top:0;z-index:50;backdrop-filter:blur(12px);
  background:rgba(11,14,26,.72);border-bottom:1px solid var(--border)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px}
.logo-mark{width:34px;height:34px;border-radius:10px;background:var(--grad);
  display:grid;place-items:center;font-weight:900;color:#fff}
.logo-text small{font-size:11px;font-weight:600;color:var(--muted);margin-left:4px}
.main-nav{display:flex;gap:26px}
.main-nav a{color:var(--muted);font-size:15px;font-weight:500;transition:.2s}
.main-nav a:hover{color:#fff}
.nav-cta{padding:9px 18px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer}
.nav-toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.3s}

/* ============ Hero ============ */
.hero{position:relative;padding:80px 0 60px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;
  background:radial-gradient(60% 60% at 75% 20%,rgba(124,92,255,.25),transparent 60%),
             radial-gradient(50% 50% at 20% 80%,rgba(34,211,238,.18),transparent 60%);
  pointer-events:none}
.hero-grid{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:50px;align-items:center}
.badge{display:inline-block;padding:6px 14px;border:1px solid var(--border);border-radius:999px;
  font-size:13px;color:var(--muted);background:var(--bg-2);margin-bottom:18px}
.hero h1{font-size:46px;line-height:1.2;font-weight:800;letter-spacing:-.5px}
.hero-sub{color:var(--muted);font-size:17px;margin:20px 0 28px;max-width:560px}
.hero-sub strong{color:var(--text)}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-actions.center{justify-content:center}
.hero-points{list-style:none;display:flex;gap:22px;flex-wrap:wrap;margin-top:26px;color:var(--muted);font-size:14px}
.hero-points li{color:#cdd5ec}

/* Hero 视觉 */
.hero-visual{display:grid;place-items:center}
.device{width:100%;max-width:340px;background:var(--surface);border:1px solid var(--border);
  border-radius:22px;overflow:hidden;box-shadow:0 30px 60px rgba(0,0,0,.45)}
.device-bar{display:flex;gap:7px;padding:14px 16px;background:var(--surface-2)}
.device-bar span{width:11px;height:11px;border-radius:50%}
.device-bar span:nth-child(1){background:#ff5f57}
.device-bar span:nth-child(2){background:#febc2e}
.device-bar span:nth-child(3){background:#28c840}
.device-body{padding:20px}
.device-body .row{display:flex;align-items:center;justify-content:space-between;
  padding:12px 0;border-bottom:1px solid var(--border);font-size:14px}
.device-body .row em{color:var(--muted);font-style:normal;font-size:13px}
.dot{width:9px;height:9px;border-radius:50%}
.dot.ok{background:#28c840}.dot.warn{background:#febc2e}
.bars{display:flex;gap:5px;align-items:flex-end;height:60px;margin:18px 0 12px}
.bars i{flex:1;background:var(--grad);border-radius:4px;animation:eq 1.2s ease-in-out infinite}
.bars i:nth-child(1){height:40%}.bars i:nth-child(2){height:70%}
.bars i:nth-child(3){height:55%}.bars i:nth-child(4){height:90%}
.bars i:nth-child(5){height:60%}.bars i:nth-child(6){height:80%}
.bars i:nth-child(7){height:45%}
@keyframes eq{0%,100%{transform:scaleY(.6)}50%{transform:scaleY(1)}}
.speed{font-size:13px;color:var(--primary-2);font-weight:600;text-align:center}

/* ============ 数据条 ============ */
.trust{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--bg-2)}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:34px 20px}
.trust-item{text-align:center}
.trust-item b{display:block;font-size:34px;font-weight:800;background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.trust-item span{color:var(--muted);font-size:14px}

/* ============ 通用区块 ============ */
.section{padding:84px 0}
.section-alt{background:var(--surface)}
.section-head{text-align:center;max-width:720px;margin:0 auto 50px}
.eyebrow{font-size:13px;letter-spacing:2px;color:var(--primary-2);font-weight:700}
.section-head h2{font-size:34px;font-weight:800;margin:10px 0 14px;letter-spacing:-.5px}
.section-head p{color:var(--muted);font-size:16px}

/* 功能卡片 */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px;transition:.25s}
.section-alt .card{background:var(--bg)}
.card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:0 14px 30px rgba(0,0,0,.35)}
.card-ico{width:48px;height:48px;border-radius:12px;background:var(--bg-2);display:grid;place-items:center;font-size:24px;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px}

/* 协议 */
.proto-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.proto{background:var(--bg);border:1px solid var(--border);border-radius:12px;
  padding:18px;text-align:center;font-weight:600;transition:.2s}
.proto:hover{border-color:var(--primary-2);color:#fff}

/* 平台 */
.plat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.plat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:26px;text-align:center;transition:.25s}
.plat:hover{transform:translateY(-4px);border-color:var(--primary)}
.plat-ico{font-size:40px;display:block;margin-bottom:12px}
.plat h3{font-size:18px;margin-bottom:4px}
.plat p{color:var(--muted);font-size:14px;margin-bottom:14px}
.plat a{color:var(--primary-2);font-weight:600;font-size:14px}

/* 步骤 */
.steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:step}
.steps li{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:28px;position:relative}
.step-no{width:42px;height:42px;border-radius:12px;background:var(--grad);color:#fff;
  display:grid;place-items:center;font-weight:800;font-size:18px;margin-bottom:14px}
.steps h3{font-size:18px;margin-bottom:8px}
.steps p{color:var(--muted);font-size:15px}
.steps a{color:var(--primary-2)}

/* 性能 */
.perf-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.perf-copy h2{font-size:32px;font-weight:800;margin:10px 0 16px}
.perf-copy p{color:var(--muted);font-size:16px}
.check-list{list-style:none;margin-top:18px;display:grid;gap:10px}
.check-list li{position:relative;padding-left:26px;color:#cdd5ec}
.check-list li::before{content:"✓";position:absolute;left:0;color:var(--primary-2);font-weight:800}
.perf-stats{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.perf-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;text-align:center}
.perf-box b{display:block;font-size:36px;font-weight:800;background:var(--grad);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.perf-box b small{font-size:16px;-webkit-text-fill-color:var(--muted)}
.perf-box span{color:var(--muted);font-size:14px}

/* 套餐 */
.price-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;max-width:760px;margin:0 auto}
.price-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);
  padding:34px;position:relative;text-align:center}
.price-card.featured{border-color:var(--primary);box-shadow:0 14px 40px rgba(124,92,255,.25)}
.price-card .tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);
  background:var(--grad);color:#fff;padding:4px 16px;border-radius:999px;font-size:13px;font-weight:700}
.price-card h3{font-size:20px;margin-bottom:14px}
.price{font-size:40px;font-weight:800;margin-bottom:20px}
.price span{font-size:20px;vertical-align:super;color:var(--muted)}
.price small{font-size:14px;color:var(--muted);font-weight:500}
.price-card ul{list-style:none;display:grid;gap:12px;margin-bottom:24px;color:var(--muted);font-size:15px}
.price-card .btn{width:100%}

/* CTA */
.cta{text-align:center;background:
  radial-gradient(60% 80% at 50% 0%,rgba(124,92,255,.22),transparent 70%)}
.cta-inner h2{font-size:34px;font-weight:800;margin-bottom:12px}
.cta-inner>p{color:var(--muted);font-size:17px;margin-bottom:26px}
.cta-note{margin-top:18px;color:var(--muted);font-size:14px}

/* FAQ */
.faq-wrap{max-width:820px;margin:0 auto}
.faq-list{display:grid;gap:14px}
.faq{background:var(--bg);border:1px solid var(--border);border-radius:12px;overflow:hidden}
.faq summary{padding:18px 22px;cursor:pointer;font-weight:600;font-size:16px;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--primary-2);transition:.2s}
.faq[open] summary::after{content:"−";transform:rotate(180deg)}
.faq-body{padding:0 22px 20px;color:var(--muted);font-size:15px}

/* 页脚 */
.site-footer{border-top:1px solid var(--border);background:var(--surface);padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}
.footer-desc{color:var(--muted);font-size:14px;margin-top:14px;max-width:320px}
.footer-col h4{font-size:15px;margin-bottom:16px}
.footer-col a{display:block;color:var(--muted);font-size:14px;margin-bottom:10px;transition:.2s}
.footer-col a:hover{color:#fff}
.kw{display:inline-block;background:var(--bg);border:1px solid var(--border);border-radius:8px;
  padding:5px 10px;font-size:13px;color:var(--muted);margin:0 6px 6px 0}
.footer-bottom{border-top:1px solid var(--border);margin-top:40px;padding-top:24px;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:13px}
.disclaimer{max-width:680px;line-height:1.6}

/* 返回顶部 */
.to-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:50%;
  background:var(--grad);color:#fff;display:grid;place-items:center;font-size:20px;font-weight:800;
  box-shadow:0 8px 24px rgba(124,92,255,.4);opacity:0;pointer-events:none;transition:.3s;z-index:40}
.to-top.show{opacity:1;pointer-events:auto}

/* ============ 响应式 ============ */
@media(max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-visual{order:-1}
  .cards,.proto-grid,.plat-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .perf-grid{grid-template-columns:1fr;gap:34px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .main-nav{position:fixed;top:68px;left:0;right:0;flex-direction:column;gap:0;
    background:var(--bg);border-bottom:1px solid var(--border);padding:10px 20px;display:none}
  .main-nav.open{display:flex}
  .main-nav a{padding:14px 0;border-bottom:1px solid var(--border)}
  .nav-cta{display:none}
  .nav-toggle{display:flex}
  .hero h1{font-size:34px}
  .trust-grid{grid-template-columns:repeat(2,1fr);gap:24px}
  .cards,.proto-grid,.plat-grid,.price-grid{grid-template-columns:1fr}
  .section{padding:60px 0}
  .section-head h2{font-size:28px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column}
}