/* ============ Unitree — site styles ============ */
:root{
  --bg:#05070a;
  --bg-2:#080b11;
  --panel:#0c1018;
  --panel-2:#101623;
  --line:rgba(255,255,255,.07);
  --line-strong:rgba(255,255,255,.15);
  --ink:#f5f7fc;
  --ink-dim:#a4abbd;
  --ink-faint:#666d80;
  --brand:#1890ff;
  --brand-2:#59c9ff;
  --cyan:#0fdae8;
  --cyan-2:#00b8d9;
  --deep:#002c8c;
  --green:#2fd47a;
  --red:#e5484d;
  --amber:#f5a524;
  --radius:20px;
  --radius-sm:13px;
  --maxw:1180px;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
em{font-style:italic;color:var(--ink)}
code{font-family:var(--mono);font-size:.86em;background:rgba(24,144,255,.14);border:1px solid rgba(24,144,255,.28);padding:.05em .38em;border-radius:6px;color:#b9e2ff}

/* ---- reveal animation ---- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ---- background decoration ---- */
.bg-grid{
  position:fixed;inset:0;z-index:-3;
  background-image:
    linear-gradient(var(--line) 1px,transparent 1px),
    linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 78% 55% at 50% 0%,#000 30%,transparent 76%);
  opacity:.55;
}
.bg-glow{
  position:fixed;top:-28%;left:50%;transform:translateX(-50%);
  width:1200px;height:760px;z-index:-2;pointer-events:none;
  background:
    radial-gradient(circle at 32% 40%,rgba(24,144,255,.32),transparent 55%),
    radial-gradient(circle at 72% 48%,rgba(15,218,232,.18),transparent 55%),
    radial-gradient(circle at 50% 78%,rgba(0,44,140,.20),transparent 60%);
  filter:blur(36px);
}
.bg-noise{
  position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.028;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- nav ---- */
.nav{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;gap:24px;
  max-width:var(--maxw);margin:0 auto;padding:16px 28px;
  transition:.3s ease;
}
.nav.scrolled{
  backdrop-filter:blur(14px);
  background:linear-gradient(180deg,rgba(5,7,10,.85),rgba(5,7,10,.4));
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand-mark{color:var(--brand-2);display:flex;align-items:center}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:14.5px;color:var(--ink-dim);font-weight:500}
.nav-links a{position:relative;transition:color .18s}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-4px;height:1.5px;background:var(--brand-2);transition:right .25s ease}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{right:0}
.nav-cta{padding:9px 16px !important;font-size:13.5px !important}
@media(max-width:760px){.nav-links{display:none}}

/* ---- buttons ---- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font-weight:600;font-size:15px;letter-spacing:-.01em;
  padding:13px 24px;border-radius:12px;cursor:pointer;
  border:1px solid transparent;transition:.2s cubic-bezier(.22,.61,.36,1);white-space:nowrap;
}
.btn-sm{padding:10px 18px;font-size:14px}
.btn-primary{
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;box-shadow:0 8px 30px -8px rgba(24,144,255,.6);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 42px -8px rgba(24,144,255,.8)}
.btn-ghost{background:rgba(255,255,255,.04);border-color:var(--line-strong);color:var(--ink)}
.btn-ghost:hover{background:rgba(255,255,255,.09);border-color:rgba(255,255,255,.3);transform:translateY(-2px)}

/* ---- hero ---- */
.hero{max-width:940px;margin:0 auto;padding:64px 28px 40px;text-align:center}
.tagline-pill{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.01em;
  color:#bfe4ff;background:rgba(24,144,255,.12);
  border:1px solid rgba(24,144,255,.3);padding:7px 16px;border-radius:999px;margin-bottom:26px;
}
.dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 0 rgba(47,212,122,.6);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(47,212,122,.5)}70%{box-shadow:0 0 0 7px rgba(47,212,122,0)}100%{box-shadow:0 0 0 0 rgba(47,212,122,0)}}
.hero-title{
  font-size:clamp(46px,8vw,88px);line-height:1.01;font-weight:900;
  letter-spacing:-.038em;margin:0 0 24px;
}
.grad{background:linear-gradient(120deg,var(--brand-2) 8%,var(--cyan) 92%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:clamp(17px,2.4vw,20px);color:var(--ink-dim);max-width:680px;margin:0 auto 34px}
.hero-sub strong{color:var(--ink)}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* ---- hero showcase stage ---- */
.hero-stage{position:relative;max-width:1000px;margin:66px auto 0}
.hero-stage-glow{
  position:absolute;inset:-6% -4% -12%;z-index:-1;pointer-events:none;
  background:radial-gradient(ellipse 60% 60% at 50% 40%,rgba(24,144,255,.4),transparent 70%);
  filter:blur(48px);
}
.hero-stage-frame{
  border:1px solid var(--line-strong);border-radius:18px;overflow:hidden;
  background:#000;box-shadow:0 40px 120px -40px rgba(0,0,0,.9),0 0 0 1px rgba(255,255,255,.03);
}
.stage-bar{
  display:flex;align-items:center;gap:8px;padding:11px 16px;
  background:linear-gradient(180deg,#14172a,#0d0f1c);border-bottom:1px solid var(--line);
}
.stage-dot{width:11px;height:11px;border-radius:50%;background:#2c3040}
.stage-dot:nth-child(1){background:#e5484d;opacity:.8}
.stage-dot:nth-child(2){background:#f5a524;opacity:.8}
.stage-dot:nth-child(3){background:#2fd47a;opacity:.8}
.stage-url{margin-left:12px;font-family:var(--mono);font-size:12.5px;color:var(--ink-faint);letter-spacing:.02em}
.stage-live{margin-left:auto;font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.12em;color:var(--red)}
.hero-stage video{width:100%;display:block;aspect-ratio:16/10;object-fit:cover;background:#000}
.hero-stage figcaption{margin-top:18px;font-size:14px;color:var(--ink-faint)}

.hero-metrics{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:56px}
.metric{
  flex:1 1 200px;max-width:250px;
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;
  transition:.2s ease;
}
.metric:hover{border-color:var(--line-strong);transform:translateY(-3px)}
.metric-num{display:block;font-size:38px;font-weight:900;letter-spacing:-.03em;
  background:linear-gradient(120deg,#fff,var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.metric-label{font-size:13.5px;color:var(--ink-faint);line-height:1.4}

/* ---- say-it demo strip ---- */
.says{max-width:var(--maxw);margin:96px auto 0;padding:0 28px}
.says-head{
  text-align:center;font-family:var(--mono);font-size:12.5px;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;color:var(--brand-2);margin-bottom:22px;
}
.says-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.say{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius-sm);padding:17px 22px;
  transition:.2s cubic-bezier(.22,.61,.36,1);
}
.say:hover{border-color:var(--line-strong);transform:translateY(-2px);background:linear-gradient(180deg,var(--panel-2),var(--bg-2))}
.say-you{font-size:15.5px;font-weight:600;color:var(--ink);letter-spacing:-.01em}
.say-do{position:relative;padding-left:20px;font-family:var(--mono);font-size:13px;color:var(--cyan);white-space:nowrap}
.say-do::before{content:"→";position:absolute;left:0;color:var(--brand-2)}
@media(max-width:760px){.says-grid{grid-template-columns:1fr}}

/* ---- context strip ---- */
.strip{
  max-width:var(--maxw);margin:60px auto;padding:20px 28px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:10px;
  font-size:14px;color:var(--ink-faint);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.strip b{color:var(--ink);font-weight:600}
.strip i{color:var(--line-strong);font-style:normal}
.strip span{color:var(--ink-faint)}

/* ---- section shared ---- */
section{position:relative}
.section-head{max-width:var(--maxw);margin:0 auto;padding:0 28px 46px;text-align:center}
.eyebrow{display:inline-block;font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--brand-2);margin-bottom:16px}
.section-head h2{font-size:clamp(28px,4.4vw,44px);font-weight:800;letter-spacing:-.03em;margin:0 auto;max-width:760px;line-height:1.12}
.section-lead{font-size:17px;color:var(--ink-dim);max-width:620px;margin:18px auto 0}

.vision,.products,.how,.safety,.cta{padding:92px 0}

/* ---- vision ---- */
.vision-grid{max-width:var(--maxw);margin:0 auto;padding:0 28px;
  display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.vcard{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:34px 32px;
  transition:.25s cubic-bezier(.22,.61,.36,1);position:relative;overflow:hidden;
}
.vcard::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(140deg,rgba(139,116,255,.5),transparent 40%);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;
  opacity:0;transition:opacity .25s}
.vcard:hover{border-color:var(--line-strong);transform:translateY(-4px)}
.vcard:hover::before{opacity:1}
.vcard-idx{font-family:var(--mono);font-size:13px;color:var(--brand-2);font-weight:600;margin-bottom:16px;letter-spacing:.1em}
.vcard h3{font-size:21px;font-weight:700;letter-spacing:-.02em;margin:0 0 12px;line-height:1.25}
.vcard p{color:var(--ink-dim);font-size:15.5px;margin:0}
@media(max-width:760px){.vision-grid{grid-template-columns:1fr}}

/* ---- products ---- */
.prod-grid{max-width:var(--maxw);margin:0 auto;padding:0 28px;
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pcard{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;
  display:flex;flex-direction:column;gap:12px;transition:.25s cubic-bezier(.22,.61,.36,1);
}
.pcard:hover{border-color:var(--line-strong);transform:translateY(-4px)}
.pcard h3{font-size:20px;font-weight:700;letter-spacing:-.02em;margin:2px 0 0}
.pcard p{color:var(--ink-dim);font-size:15px;margin:0;flex:1}
.pcard-tags{font-family:var(--mono);font-size:12px;color:var(--ink-faint);letter-spacing:.02em}
.pcard-link{font-size:14px;font-weight:600;color:var(--brand-2);transition:.18s}
.pcard-link:hover{color:var(--cyan)}
.badge{display:inline-flex;align-items:center;gap:6px;align-self:flex-start;font-size:12px;font-weight:600;padding:5px 12px;border-radius:999px;letter-spacing:.01em}
.badge-live{color:var(--green);background:rgba(47,212,122,.12);border:1px solid rgba(47,212,122,.3)}
.badge-core{color:var(--cyan);background:rgba(15,218,232,.12);border:1px solid rgba(15,218,232,.3)}
.badge-next{color:var(--brand-2);background:rgba(24,144,255,.14);border:1px solid rgba(24,144,255,.32)}
.badge-horizon{color:var(--amber);background:rgba(245,165,36,.12);border:1px solid rgba(245,165,36,.3)}
@media(max-width:900px){.prod-grid{grid-template-columns:1fr}}

/* ---- how it works ---- */
.flow{
  max-width:var(--maxw);margin:0 auto;padding:0 28px;
  display:flex;align-items:stretch;justify-content:center;gap:8px;flex-wrap:wrap;
}
.flow-step{
  flex:1 1 190px;max-width:230px;text-align:center;
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:28px 22px;
  transition:.25s ease;
}
.flow-step:hover{transform:translateY(-4px);border-color:var(--line-strong)}
.flow-hl{border-color:rgba(24,144,255,.5);box-shadow:0 0 0 1px rgba(24,144,255,.25),0 14px 40px -18px rgba(24,144,255,.6)}
.flow-ico{width:46px;height:46px;margin:0 auto 14px;display:flex;align-items:center;justify-content:center;
  color:var(--brand-2);background:rgba(24,144,255,.1);border:1px solid rgba(24,144,255,.24);border-radius:12px}
.flow-ico svg{width:24px;height:24px}
.flow-hl .flow-ico{color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));border-color:transparent}
.flow-step h4{margin:0 0 8px;font-size:17px;font-weight:700;letter-spacing:-.01em}
.flow-step p{margin:0;font-size:14px;color:var(--ink-dim)}
.flow-arrow{display:flex;align-items:center;color:var(--ink-faint)}
.flow-arrow svg{width:22px;height:22px}
@media(max-width:760px){.flow-arrow{transform:rotate(90deg)}}

/* ---- safety ---- */
.safety-grid{max-width:var(--maxw);margin:0 auto;padding:0 28px;
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.scard{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius-sm);padding:24px 24px;
  border-left:3px solid var(--red);transition:.2s ease;
}
.scard:hover{transform:translateY(-3px);border-color:var(--line-strong);border-left-color:var(--red)}
.scard b{display:block;font-size:16px;margin-bottom:6px;letter-spacing:-.01em}
.scard span{font-size:14px;color:var(--ink-dim)}
@media(max-width:820px){.safety-grid{grid-template-columns:1fr}}

/* ---- cta ---- */
.cta{max-width:820px;margin:0 auto;text-align:center;padding-top:40px}
.cta h2{font-size:clamp(28px,4.6vw,44px);font-weight:800;letter-spacing:-.03em;margin:0 auto 20px;max-width:720px;line-height:1.12}
.cta p{font-size:18px;color:var(--ink-dim);max-width:600px;margin:0 auto 32px}
.cta strong{color:var(--ink)}

/* ---- footer ---- */
.footer{
  border-top:1px solid var(--line);margin-top:40px;
  max-width:var(--maxw);margin-left:auto;margin-right:auto;padding:48px 28px;text-align:center;
}
.footer-brand{display:inline-flex;align-items:center;gap:8px;font-weight:800;font-size:20px;letter-spacing:-.02em;margin-bottom:12px}
.footer-brand .brand-mark{color:var(--brand-2)}
.footer p{color:var(--ink-dim);max-width:480px;margin:0 auto 20px;font-size:15px}
.footer-links{display:flex;gap:24px;justify-content:center;margin-bottom:20px;font-size:14.5px;color:var(--ink-dim);font-weight:500}
.footer-links a:hover{color:var(--ink)}
.footer small{color:var(--ink-faint);font-size:13px}