:root{
  --bg:#060B10; --bg-2:#0A141C; --bg-3:#0E1D26;
  --panel:rgba(255,255,255,0.045); --panel-strong:rgba(255,255,255,0.08);
  --line:rgba(94,196,224,0.16);
  --cyan:#33C6E8; --cyan-soft:#8ADCEF; --teal:#0E5C75;
  --green:#49E0A0; --amber:#F2B45A;
  --text:#E9F4F8; --muted:#8FB0BC; --num:"Inter",system-ui,sans-serif;
  --radius:18px; --shadow:0 24px 60px rgba(0,0,0,0.45);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.75;overflow-x:hidden}
::selection{background:rgba(51,198,232,.32)}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.num{font-family:var(--num);font-weight:800;letter-spacing:.01em}
.bg-fx{position:fixed;inset:0;z-index:0;pointer-events:none}
.bg-fx::before{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(94,196,224,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(94,196,224,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 90% 60% at 50% 0%,#000 30%,transparent 75%)}
.bg-fx::after{content:"";position:absolute;top:-260px;left:50%;transform:translateX(-50%);
  width:900px;height:700px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(46,169,201,.20),transparent 70%);filter:blur(10px)}
main,header.nav,footer{position:relative;z-index:1}
.wrap{max-width:1200px;margin:0 auto;padding:0 28px}

/* 导航 */
header.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);background:rgba(6,11,16,.74);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:12px}
.logo-mark{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(135deg,#0E5C75,#2EA9C9);box-shadow:0 0 22px rgba(51,198,232,.45);
  font-family:var(--num);font-weight:900;font-size:15px;color:#fff}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text b{font-size:18px;letter-spacing:.10em}
.logo-text span{font-size:10px;color:var(--muted);letter-spacing:.28em;font-family:var(--num)}
nav.links{display:flex;gap:28px;font-size:14.5px;color:#C6DBE3}
nav.links a{position:relative;padding:6px 0;transition:color .2s}
nav.links a:hover,nav.links a.active{color:var(--cyan-soft)}
nav.links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),transparent);transition:width .25s}
nav.links a:hover::after,nav.links a.active::after{width:100%}
.cta-btn{display:inline-block;background:linear-gradient(135deg,#12718E,#2EA9C9);color:#fff;
  font-weight:700;font-size:14.5px;padding:10px 22px;border-radius:999px;
  box-shadow:0 8px 26px rgba(46,169,201,.35);transition:transform .2s,box-shadow .2s}
.cta-btn:hover{transform:translateY(-2px);box-shadow:0 12px 34px rgba(46,169,201,.5)}
.cta-btn.ghost{background:transparent;border:1px solid var(--line);box-shadow:none;color:var(--cyan-soft)}
.cta-btn.ghost:hover{background:rgba(51,198,232,.08)}
.menu-btn{display:none;width:42px;height:42px;border-radius:11px;border:1px solid var(--line);
  background:var(--panel);color:var(--cyan-soft);font-size:20px;cursor:pointer}

/* 通用 */
section{padding:90px 0;position:relative}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--num);
  font-size:12.5px;letter-spacing:.22em;color:var(--cyan);text-transform:uppercase;margin-bottom:18px}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--cyan)}
h1{font-size:clamp(34px,5vw,60px);line-height:1.12;font-weight:900;letter-spacing:-.01em}
h2{font-size:clamp(26px,3.4vw,40px);line-height:1.2;font-weight:900;margin-bottom:16px}
h3{font-size:20px;font-weight:800;margin-bottom:10px}
.lead{font-size:clamp(16px,1.6vw,19px);color:#BCD2DB;max-width:760px}
.grad{background:linear-gradient(100deg,#8ADCEF,#33C6E8 45%,#49E0A0);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.muted{color:var(--muted)}

/* hero */
.hero{padding-top:96px;padding-bottom:80px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero .lead{margin-top:22px}
.hero-cta{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.hero-badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:30px}
.chip{font-family:var(--num);font-size:12.5px;color:var(--cyan-soft);
  border:1px solid var(--line);background:var(--panel);padding:6px 13px;border-radius:999px}

/* 设备卡 */
.device{position:relative;border:1px solid var(--line);border-radius:24px;
  background:linear-gradient(160deg,rgba(18,113,142,.18),rgba(10,20,28,.6));
  padding:30px;box-shadow:var(--shadow);overflow:hidden}
.device::before{content:"";position:absolute;inset:-40% -30% auto auto;width:320px;height:320px;
  background:radial-gradient(closest-side,rgba(73,224,160,.28),transparent 70%);filter:blur(6px)}
.device-can{position:relative;height:150px;border-radius:18px;margin-bottom:22px;
  background:linear-gradient(150deg,#123240,#0A141C);border:1px solid var(--line);
  display:grid;place-items:center}
.device-can .led{width:12px;height:12px;border-radius:50%;background:var(--green);
  box-shadow:0 0 18px var(--green);position:absolute;top:16px;right:16px;animation:pulse 2.2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.device-can .usb{font-family:var(--num);font-size:13px;color:var(--cyan-soft);letter-spacing:.1em}
.device-rows{display:grid;gap:10px}
.device-rows div{display:flex;justify-content:space-between;font-size:14px;
  padding:8px 0;border-bottom:1px dashed rgba(94,196,224,.14)}
.device-rows span:first-child{color:var(--muted)}
.device-rows span:last-child{font-family:var(--num);color:var(--cyan-soft);font-weight:700}

/* 卡片网格 */
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);
  padding:28px;transition:transform .25s,border-color .25s,background .25s}
.card:hover{transform:translateY(-4px);border-color:rgba(51,198,232,.4);background:var(--panel-strong)}
.card .ico{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;
  background:linear-gradient(135deg,rgba(46,169,201,.3),rgba(73,224,160,.18));
  font-size:22px;margin-bottom:16px}
.card p{color:#A9C3CD;font-size:15px}
.card ul{margin-top:10px;padding-left:18px;color:#A9C3CD;font-size:14.5px}
.card li{margin:4px 0}

/* 架构流程 */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:12px}
.flow .step{border:1px solid var(--line);border-radius:14px;background:var(--panel);
  padding:20px;position:relative}
.flow .step .n{font-family:var(--num);font-weight:900;font-size:13px;color:var(--cyan);
  letter-spacing:.1em;margin-bottom:8px}
.flow .step b{display:block;font-size:15.5px;margin-bottom:6px}
.flow .step small{color:var(--muted);font-size:13px}

/* 对比表 */
.cmp{width:100%;border-collapse:collapse;margin-top:10px;font-size:14.5px}
.cmp th,.cmp td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line)}
.cmp th{color:var(--cyan-soft);font-family:var(--num);letter-spacing:.04em;font-size:13px}
.cmp td:first-child{color:#C6DBE3;font-weight:700}
.cmp .yes{color:var(--green)} .cmp .no{color:#E07A7A}
.cmp tr:hover td{background:rgba(255,255,255,.02)}

/* FAQ */
.faq details{border:1px solid var(--line);border-radius:14px;background:var(--panel);
  padding:18px 22px;margin-bottom:12px}
.faq summary{cursor:pointer;font-weight:700;font-size:16px;list-style:none;
  display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--num);color:var(--cyan);font-size:22px;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{color:#A9C3CD;margin-top:12px;font-size:15px}

/* 场景标签 */
.tags{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px}
.tags span{border:1px solid var(--line);background:var(--panel);border-radius:12px;
  padding:12px 18px;font-size:14.5px;color:#C6DBE3}
.tags span b{color:var(--cyan-soft)}

/* CTA 条 */
.cta-band{border:1px solid var(--line);border-radius:24px;padding:48px;
  background:linear-gradient(135deg,rgba(18,113,142,.24),rgba(10,20,28,.5));
  display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap}
.cta-band h2{margin-bottom:8px}

/* 页脚 */
footer{border-top:1px solid var(--line);padding:56px 0 36px;margin-top:20px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
.foot-grid h4{font-size:14px;color:var(--cyan-soft);margin-bottom:14px;letter-spacing:.06em}
.foot-grid a,.foot-grid p{color:var(--muted);font-size:14px;display:block;padding:5px 0}
.foot-grid a:hover{color:var(--cyan-soft)}
.foot-bottom{margin-top:38px;padding-top:22px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;color:var(--muted);font-size:13px;flex-wrap:wrap;gap:10px}

/* 页面头部（内页） */
.page-hero{padding-top:80px;padding-bottom:40px;border-bottom:1px solid var(--line)}
.page-hero h1{font-size:clamp(30px,4vw,48px)}

/* 文章正文 */
.prose{max-width:820px}
.prose h2{margin-top:38px}
.prose h3{margin-top:26px;color:var(--cyan-soft)}
.prose p{color:#BCD2DB;margin:14px 0}
.prose ul,.prose ol{margin:12px 0 12px 22px;color:#BCD2DB}
.prose li{margin:6px 0}
.prose code{background:rgba(51,198,232,.12);color:var(--cyan-soft);padding:2px 7px;border-radius:6px;
  font-family:var(--num);font-size:13.5px}
.callout{border-left:3px solid var(--cyan);background:var(--panel);border-radius:0 12px 12px 0;
  padding:16px 20px;margin:22px 0;color:#C6DBE3}

/* 图片 */
.media{display:block;width:100%;border-radius:16px;object-fit:cover;object-position:center;
  border:1px solid var(--line);background:var(--bg-2)}
.media.r169{aspect-ratio:16/9}
.media.r43{aspect-ratio:4/3}
.media.r11{aspect-ratio:1/1}
.figcap{color:var(--muted);font-size:13px;margin-top:10px;text-align:center}
.imgband{margin-top:34px}

/* 移动端 */
@media(max-width:900px){
  .hero-grid,.g3,.g2,.flow,.foot-grid{grid-template-columns:1fr}
  .flow{grid-template-columns:1fr 1fr}
  nav.links{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;
    background:rgba(6,11,16,.97);padding:20px 28px;gap:16px;border-bottom:1px solid var(--line)}
  nav.links.open{display:flex}
  .menu-btn{display:block}
  .cta-band{padding:32px}
  section{padding:66px 0}
}
@media(max-width:520px){.flow{grid-template-columns:1fr}.device{padding:22px}}