:root{
  --bg:#07090d;--bg2:#0d1219;--panel:#10161f;--line:rgba(255,255,255,.08);--line2:rgba(255,255,255,.14);
  --fg:#eef2f7;--muted:#8d9bad;--dim:#5d6b7c;
  --radar:#2ee6e0;--cam:#ffb547;--imu:#ff5aa6;--ai:#c6ff3d;--bad:#ff6b5e;
  --display:"Barlow Condensed","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --body:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --max:1200px;--gutter:16px;color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--body);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3{font-family:var(--display);line-height:1.05;margin:0;text-wrap:balance;letter-spacing:.005em}
h1{font-size:clamp(42px,6.4vw,84px);font-weight:800}
h2{font-size:clamp(32px,4.4vw,56px);font-weight:800}
h3{font-size:22px;font-weight:700}
p{margin:0}
.eyebrow{font:600 12px/1.4 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:14px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.eyebrow .sep{color:var(--dim)}
.dot{display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--muted);vertical-align:middle;margin-right:6px;box-shadow:0 0 10px currentColor}
.dot.radar{background:var(--radar);color:var(--radar)}.dot.cam{background:var(--cam);color:var(--cam)}.dot.imu{background:var(--imu);color:var(--imu)}.dot.ai{background:var(--ai);color:var(--ai)}
.lede{font-size:clamp(17px,1.5vw,20px);color:var(--muted);max-width:60ch;margin-top:22px}
.sub{color:var(--muted);max-width:68ch;margin-top:16px;font-size:17px}
.fine{font-size:13px;color:var(--muted)}
.caption{font-size:13px;color:var(--muted);margin-top:10px}

/* nav */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:24px;padding:10px var(--gutter);background:rgba(7,9,13,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand img{width:86px;height:auto}
.links{display:flex;gap:22px;margin-left:12px;font-size:14px;color:var(--muted)}
.links a{text-decoration:none;transition:color .2s}.links a:hover{color:var(--fg)}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.lang{display:inline-flex;align-items:center;gap:6px;font:600 12px var(--mono);color:var(--muted);background:transparent;border:1px solid var(--line2);border-radius:999px;padding:6px 10px;cursor:pointer}
.lang i{width:26px;height:14px;border-radius:999px;background:var(--line2);position:relative;display:inline-block}
.lang i::after{content:"";position:absolute;top:2px;left:2px;width:10px;height:10px;border-radius:50%;background:var(--fg);transition:transform .25s}
html[lang="zh-CN"] .lang i::after{transform:translateX(12px)}
html[lang="zh-CN"] .lang [data-lang-zh],html[lang="en"] .lang [data-lang-en]{color:var(--fg)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:10px;border:1px solid var(--line2);background:rgba(255,255,255,.03);color:var(--fg);text-decoration:none;font-weight:600;font-size:15px;transition:transform .15s,background .2s,border-color .2s;cursor:pointer}
.btn:hover{background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.28);transform:translateY(-1px)}
.btn-primary{background:var(--ai);color:#06080b;border-color:var(--ai)}
.btn-primary:hover{background:#d6ff6b;border-color:#d6ff6b}
.btn-sm{padding:8px 14px;font-size:13px;border-radius:8px}

/* hero */
.hero{position:relative;overflow:hidden;padding:clamp(48px,8vw,110px) var(--gutter) 60px;min-height:min(92vh,900px);display:flex;align-items:center}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.9}
.hero::after{content:"";position:absolute;inset:auto 0 0 0;height:160px;background:linear-gradient(to bottom,transparent,var(--bg));z-index:1;pointer-events:none}
.hero-grid{position:relative;z-index:2;max-width:var(--max);margin:0 auto;display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;width:100%}
.hero h1{background:linear-gradient(180deg,#fff 0%,#cfd8e3 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.stats{list-style:none;padding:0;margin:40px 0 0;display:grid;grid-template-columns:repeat(5,1fr);gap:14px;border-top:1px solid var(--line);padding-top:20px}
.stats b{display:block;font:600 24px/1.1 var(--mono);color:var(--fg)}
.stats span{display:block;font-size:12px;color:var(--muted);margin-top:4px;line-height:1.35}
.hero-device{margin:0;position:relative;border-radius:18px;overflow:hidden;border:1px solid var(--line2);box-shadow:0 40px 90px rgba(0,0,0,.6),0 0 0 1px rgba(255,255,255,.02) inset;background:#0a0d12}
.hero-device img{width:100%;filter:saturate(1.05) contrast(1.04)}
.callouts{position:absolute;inset:0;margin:0;pointer-events:none}
.co{position:absolute;left:var(--x);top:var(--y);transform:translate(-50%,-50%);font:600 11px var(--mono);letter-spacing:.06em;color:var(--fg);background:rgba(7,9,13,.78);border:1px solid var(--cam);border-radius:6px;padding:4px 8px;white-space:nowrap;opacity:0;animation:coIn .6s ease forwards;animation-delay:calc(.6s + var(--d,0s))}
.co i{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--cam);margin-right:6px;box-shadow:0 0 10px var(--cam);animation:pulse 2.4s infinite}
.co-radar{border-color:var(--radar)}.co-radar i{background:var(--radar);box-shadow:0 0 10px var(--radar)}
.co-dtof{--d:.2s}.co-zoom{--d:.4s}.co-hs{--d:.6s}.co-radar{--d:.8s}
@keyframes coIn{to{opacity:1;transform:translate(-50%,-50%) translateY(-6px)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}

/* sections */
.section{padding:clamp(64px,8vw,120px) var(--gutter);max-width:calc(var(--max) + 2*var(--gutter));margin:0 auto}
.section.alt{position:relative}
.section.alt::before{content:"";position:absolute;inset:0 -100vw;background:var(--bg2);z-index:-1}
.sec-head{max-width:860px;margin-bottom:40px}

/* explainer */
.explainer{background:var(--panel);border:1px solid var(--line2);border-radius:18px;overflow:hidden;box-shadow:0 30px 80px rgba(0,0,0,.5)}
.ex-top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.seg{display:inline-flex;border:1px solid var(--line2);border-radius:10px;overflow:hidden;background:rgba(255,255,255,.02)}
.seg button{font:600 14px var(--body);padding:8px 14px;border:0;background:transparent;color:var(--muted);cursor:pointer;transition:background .2s,color .2s}
.seg button+button{border-left:1px solid var(--line)}
.seg button[aria-pressed="true"]{background:var(--fg);color:#06080b}
.ex-controls{display:flex;gap:8px}
.icon-btn{width:38px;height:38px;border-radius:10px;border:1px solid var(--line2);background:rgba(255,255,255,.03);color:var(--fg);display:inline-grid;place-items:center;font-size:22px;line-height:1;cursor:pointer}
.icon-btn:hover{background:rgba(255,255,255,.08)}
.ex-stage{position:relative;background:#07090d}
.ex-stage.is-3d{background:linear-gradient(#0f141c,#07090d)}
.ex-stage canvas{display:block;position:relative;width:100%;height:auto;cursor:pointer}
.ex-stage canvas.ex-gl{position:absolute;inset:0;height:100%;pointer-events:none;cursor:default}
.ex-prog{height:3px;background:rgba(255,255,255,.06)}
.ex-prog i{display:block;height:100%;width:0;background:var(--ai);transition:width .1s linear}
.ex-cap{padding:18px 20px 6px;font-size:clamp(15px,1.6vw,18px);color:var(--fg);min-height:72px;line-height:1.55}
.ex-cap.is-in{animation:capIn .45s ease}
@keyframes capIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.acts{list-style:none;margin:0;padding:10px 14px 14px;display:grid;grid-template-columns:repeat(6,1fr);gap:8px}
.acts button{width:100%;text-align:left;border:1px solid var(--line);border-radius:10px;background:transparent;color:var(--muted);padding:10px 12px;cursor:pointer;display:grid;gap:2px;transition:border-color .2s,color .2s,background .2s}
.acts button b{font:600 11px var(--mono);letter-spacing:.1em;color:var(--dim)}
.acts button span{font-size:13px;line-height:1.3}
.acts button:hover{border-color:var(--line2);color:var(--fg)}
.acts button[aria-pressed="true"]{border-color:var(--ai);color:var(--fg);background:rgba(198,255,61,.06)}
.acts button[aria-pressed="true"] b{color:var(--ai)}

.triad{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:28px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px 20px;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;inset:0 auto 0 0;width:3px;background:var(--c,var(--muted))}
.card h3{font-size:20px;display:flex;align-items:center;gap:4px;margin-bottom:10px}
.card p{font-size:14px;color:var(--muted)}
.c-cam{--c:var(--cam)}.c-radar{--c:var(--radar)}.c-imu{--c:var(--imu)}.c-ai{--c:var(--ai)}

/* split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split.rev .split-copy{order:1}.split.rev .phones{order:2}
.split-media img{border-radius:16px;border:1px solid var(--line2);box-shadow:0 30px 70px rgba(0,0,0,.5)}
.spec{width:100%;border-collapse:collapse;margin-top:26px;font-size:14px}
.spec th{text-align:left;font:600 11px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--dim);padding:0 10px 10px 0;border-bottom:1px solid var(--line2)}
.spec td{padding:11px 10px 11px 0;border-bottom:1px solid var(--line);vertical-align:top}
.spec td:nth-child(2){font-family:var(--mono);font-size:13px;color:var(--fg);white-space:nowrap}
.spec td:nth-child(3){color:var(--muted)}
.src{display:inline-block;font:600 11px var(--mono);padding:2px 7px;border-radius:5px;border:1px solid;margin:1px 2px 1px 0;white-space:nowrap}
.src.radar{color:var(--radar);border-color:rgba(46,230,224,.5)}.src.cam{color:var(--cam);border-color:rgba(255,181,71,.5)}.src.imu{color:var(--imu);border-color:rgba(255,90,166,.5)}

/* imu */
.imu-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.imu-grid figure{margin:0;background:var(--panel);border:1px solid var(--line);border-radius:16px;overflow:hidden}
.imu-grid img{width:100%}
.imu-grid figcaption{padding:14px 16px;font-size:13px;color:var(--muted)}
.chips{list-style:none;padding:0;margin:22px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.chips li{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:rgba(255,90,166,.04)}
.chips b{display:block;font:600 26px/1.1 var(--mono);color:var(--imu)}
.chips span{font-size:13px;color:var(--muted);display:block;margin-top:4px}

/* recon */
.pipe{list-style:none;padding:0;margin:0 0 28px;display:grid;grid-template-columns:repeat(8,1fr);gap:8px;counter-reset:p}
.pipe li{position:relative;border:1px solid var(--line);border-radius:10px;padding:12px 12px 12px 12px;background:var(--panel);font-size:12.5px;color:var(--muted);line-height:1.35;display:grid;gap:6px}
.pipe li b{font:600 12px var(--mono);color:var(--cam)}
.pipe li:not(:last-child)::after{content:"";position:absolute;right:-8px;top:50%;width:8px;height:1px;background:var(--line2)}
.frames{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.frames figure{margin:0;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#000;aspect-ratio:9/16}
.frames img{width:100%;height:100%;object-fit:cover}
.frames figcaption{position:relative;margin-top:-34px;padding:8px 12px;font:500 12px var(--mono);color:var(--fg);background:linear-gradient(to top,rgba(0,0,0,.85),transparent)}
.metrics{margin-top:36px}
.metrics h3{margin-bottom:6px}

/* app */
.phones{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;align-items:end}
.phones img{border-radius:18px;border:1px solid var(--line2);box-shadow:0 20px 50px rgba(0,0,0,.5);background:#000}
.phones img:nth-child(2),.phones img:nth-child(4){transform:translateY(22px)}

/* sports */
.sports{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.sport{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px}
.sport b{font-size:30px;display:block;margin-bottom:8px}
.sport h3{font-size:22px}
.sport p{font:600 14px var(--mono);color:var(--radar);margin:6px 0 8px}
.sport small{font-size:13px;color:var(--muted);line-height:1.45;display:block}

/* footer */
.foot{border-top:1px solid var(--line);padding:40px var(--gutter) 60px;background:var(--bg)}
.foot-grid{max-width:var(--max);margin:0 auto;display:grid;grid-template-columns:1fr 2fr;gap:30px;align-items:start}
.foot img{width:120px}
.foot p{margin-top:8px}
.foot a{color:var(--muted)}

/* reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.co{animation:none;opacity:1}.co i{animation:none}}

/* responsive */
@media (max-width:1040px){
  .links{display:none}
  .hero-grid{grid-template-columns:1fr;gap:28px}
  .stats{grid-template-columns:repeat(3,1fr)}
  .triad{grid-template-columns:repeat(2,1fr)}
  .acts{grid-template-columns:repeat(3,1fr)}
  .pipe{grid-template-columns:repeat(4,1fr)}
  .pipe li:nth-child(4)::after{display:none}
  .split{grid-template-columns:1fr;gap:28px}
  .split.rev .split-copy{order:0}
  .foot-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .triad,.imu-grid,.chips,.sports{grid-template-columns:1fr}
  .acts{grid-template-columns:repeat(2,1fr)}
  .pipe{grid-template-columns:repeat(2,1fr)}
  .pipe li:nth-child(2n)::after{display:none}
  .frames{grid-template-columns:repeat(2,1fr)}
  .phones{grid-template-columns:repeat(2,1fr)}
  .phones img:nth-child(2),.phones img:nth-child(4){transform:none}
  .nav{gap:12px}.brand img{width:70px}
  .btn-sm{display:none}
  .spec td:nth-child(2){white-space:normal}
  .ex-cap{min-height:96px;font-size:15px}
  .co{font-size:9px;padding:3px 6px}
}

/* watch mode */
.watch-grid{display:grid;grid-template-columns:1.25fr .9fr;gap:40px;align-items:start}
.watch-svg{width:100%;height:auto;display:block;border-radius:16px;border:1px solid var(--line2);box-shadow:0 30px 70px rgba(0,0,0,.5);background:#07090d}
.watch-media .caption{margin-top:12px}
.steps{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.steps li{position:relative;border:1px solid var(--line);border-radius:14px;padding:18px 20px 18px 24px;background:var(--panel);overflow:hidden}
.steps li::before{content:"";position:absolute;inset:0 auto 0 0;width:3px;background:var(--c,var(--muted))}
.steps li.s-cam{--c:var(--cam)}.steps li.s-radar{--c:var(--radar)}.steps li.s-zoom{--c:var(--cam)}.steps li.s-ai{--c:var(--ai)}
.steps b{font:600 11px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--c,var(--muted));display:block;margin-bottom:6px}
.steps h3{font-size:19px;margin-bottom:6px}
.steps p{font-size:14px;color:var(--muted);line-height:1.5}
.chips-watch li{background:rgba(198,255,61,.04)}.chips-watch b{color:var(--ai)}
.spec td b{font:600 10.5px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--fg);margin-right:6px}
.sport{display:flex;flex-direction:column}
.sport .modes{display:flex;gap:6px;margin-top:auto;padding-top:12px}
.sport .modes i{font:600 10.5px var(--mono);letter-spacing:.1em;text-transform:uppercase;font-style:normal;padding:4px 8px;border-radius:999px;border:1px solid}
.sport .modes .m-train{color:var(--radar);border-color:rgba(46,230,224,.4)}
.sport .modes .m-watch{color:var(--ai);border-color:rgba(198,255,61,.4)}
@media (max-width:1100px){.sports{grid-template-columns:repeat(2,1fr)}.watch-grid{grid-template-columns:1fr}}
@media (max-width:640px){.sports{grid-template-columns:1fr}}