:root{
  --bg:#101219; --bg-alt:#161925; --card:#1b1f2e; --line:#2a2f42;
  --text:#f0f0f0; --muted:#919297; --blue:#5D7CFF; --coral:#FD6860; --green:#8df435;
  --radius:20px; --max:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:Pretendard,Inter,-apple-system,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased;word-break:keep-all;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.container{max-width:var(--max);margin:0 auto;padding:0 24px}
.narrow{max-width:820px}.center{text-align:center}

/* nav */
.nav{position:fixed;inset:0 0 auto;z-index:50;transition:background .3s,border-color .3s;border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(16,18,25,.82);backdrop-filter:blur(14px);border-color:var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{font-weight:800;font-size:24px;letter-spacing:-.5px}.logo span{color:var(--blue)}
.nav-links{display:flex;gap:36px;align-items:center;font-size:15px}
.nav-links a{color:var(--muted);transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--text)}
.nav-links .pill{color:var(--text);border:1px solid var(--blue);padding:7px 16px;border-radius:999px}
.nav-links .pill:hover{background:var(--blue)}
.nav-toggle{display:none;background:none;border:0;width:32px;height:32px;cursor:pointer;flex-direction:column;justify-content:center;gap:7px}
.nav-toggle span{display:block;height:2px;background:var(--text);transition:.3s}

/* hero */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;padding:140px 0 100px;overflow:hidden}
.hero-sub{min-height:auto;padding:180px 0 100px}
.hero-glow{position:absolute;width:900px;height:900px;right:-250px;top:-250px;border-radius:50%;
  background:radial-gradient(circle,rgba(93,124,255,.35),rgba(93,124,255,0) 62%);pointer-events:none;animation:float 12s ease-in-out infinite}
.hero-glow::after{content:"";position:absolute;width:420px;height:420px;left:-120px;bottom:80px;border-radius:50%;
  background:radial-gradient(circle,rgba(253,104,96,.22),rgba(253,104,96,0) 65%)}
@keyframes float{50%{transform:translate(-40px,30px)}}
.hero .container{position:relative}
.eyebrow{color:var(--blue);font-weight:600;font-size:14px;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:16px}
h1{font-size:clamp(36px,6vw,72px);line-height:1.12;letter-spacing:-1.5px;font-weight:800;margin-bottom:24px}
h1 em,h2 em{font-style:normal;background:linear-gradient(90deg,var(--blue),var(--coral));-webkit-background-clip:text;background-clip:text;color:transparent}
h2{font-size:clamp(28px,4vw,46px);line-height:1.25;letter-spacing:-1px;font-weight:700;margin-bottom:20px}
h3{font-size:20px;line-height:1.4;font-weight:700;margin-bottom:10px}
.lead{color:var(--muted);font-size:clamp(16px,1.6vw,19px);max-width:760px;margin-bottom:32px}
.center .lead{margin-left:auto;margin-right:auto}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;background:var(--blue);color:#fff;padding:14px 28px;border-radius:999px;font-weight:600;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(93,124,255,.35)}
.btn-ghost{background:transparent;border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--text);box-shadow:none}

/* sections */
.section{padding:110px 0}
.section-alt{background:var(--bg-alt)}
.section-title{margin-bottom:40px}
.grid-2,.grid-3,.grid-4{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:32px;transition:border-color .3s,transform .3s}
.card:hover{border-color:rgba(93,124,255,.6);transform:translateY(-4px)}
.card p,.feature p,.member p,.step p{color:var(--muted);font-size:15.5px}
.card h3 a{color:var(--blue)}
.icon{width:52px;height:52px;border-radius:14px;display:grid;place-items:center;font-size:22px;background:rgba(93,124,255,.15);color:var(--blue);margin-bottom:20px}
.tag{display:inline-block;font-size:12px;font-weight:600;padding:4px 12px;border-radius:999px;background:rgba(93,124,255,.15);color:var(--blue);margin-bottom:16px}
.tag-red{background:rgba(253,104,96,.15);color:var(--coral)}

.split{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.visual-robot{position:relative;aspect-ratio:1;display:grid;place-items:center}
.orb{width:34%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle at 35% 35%,#8fa4ff,var(--blue) 45%,#26306b);box-shadow:0 0 80px rgba(93,124,255,.6)}
.ring{position:absolute;border:1px solid rgba(93,124,255,.35);border-radius:50%;animation:spin 18s linear infinite}
.ring::before{content:"";position:absolute;width:12px;height:12px;border-radius:50%;background:var(--coral);top:-6px;left:50%;box-shadow:0 0 16px var(--coral)}
.r1{inset:22%}.r2{inset:10%;animation-duration:26s;animation-direction:reverse}.r3{inset:0;animation-duration:40s}
.r2::before{background:var(--green);box-shadow:0 0 16px var(--green)}
@keyframes spin{to{transform:rotate(360deg)}}

.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:s}
.step{position:relative;padding:36px 32px;border-radius:var(--radius);background:linear-gradient(160deg,rgba(93,124,255,.14),rgba(93,124,255,.02));border:1px solid var(--line)}
.step .num,.feature .num{font-weight:800;color:var(--blue);font-size:15px;display:block;margin-bottom:14px}
.step .num{width:40px;height:40px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center}

.features{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.feature{background:var(--bg);padding:40px}
.section-alt .feature{background:var(--bg-alt)}
.feature-wide{grid-column:1/-1}

.checks{list-style:none;display:grid;gap:14px;color:var(--muted)}
.checks li{padding-left:28px;position:relative}
.checks li::before{content:"✓";position:absolute;left:0;color:var(--blue);font-weight:700}
.checks strong{color:var(--text)}
.tree{display:grid;gap:28px;justify-items:center}
.tree .branch{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.node{background:var(--card);border:1px solid var(--blue);border-radius:12px;padding:12px 20px;font-weight:600;font-size:15px}
.node.root{background:var(--blue);color:#fff;padding:16px 32px}
.branch.small .node{border-color:var(--line);font-size:13px;padding:8px 14px;color:var(--muted)}

.team{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.member{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.avatar{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font-size:24px;font-weight:700;background:linear-gradient(135deg,var(--blue),var(--coral));margin-bottom:20px}
.member h3 small{font-size:14px;color:var(--blue);font-weight:600;margin-left:6px}
.member .role{color:var(--text);font-size:14px;margin-bottom:10px;opacity:.85}

.cta{background:radial-gradient(ellipse at center,rgba(93,124,255,.22),transparent 70%)}

/* footer */
.footer{border-top:1px solid var(--line);padding:56px 0 40px;color:var(--muted);font-size:14px}
.footer-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px;flex-wrap:wrap;gap:20px}
.footer-top nav{display:flex;gap:28px}.footer-top nav a:hover{color:var(--text)}
.footer .logo{color:var(--text)}
.footer-info{line-height:1.9;margin-bottom:16px}
.copy{font-size:13px;opacity:.7}

/* reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}.hero-glow,.ring{animation:none}}

@media (max-width:960px){
  .grid-3,.grid-4,.team,.steps{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr}
  .visual-robot{max-width:360px;margin:0 auto;width:100%}
}
@media (max-width:680px){
  .container{padding:0 16px}
  .grid-2,.grid-3,.grid-4,.team,.steps,.features{grid-template-columns:1fr}
  .section{padding:80px 0}
  .nav-toggle{display:flex}
  .nav-links{position:fixed;inset:72px 0 auto;flex-direction:column;gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:8px 16px 20px;display:none}
  .nav-links a{padding:14px 0;width:100%;font-size:17px}
  .nav-links .pill{text-align:center;margin-top:8px}
  .menu-open .nav-links{display:flex}
  .menu-open .nav{background:var(--bg)}
  .menu-open .nav-toggle span:first-child{transform:translateY(4.5px) rotate(45deg)}
  .menu-open .nav-toggle span:last-child{transform:translateY(-4.5px) rotate(-45deg)}
  .card,.member,.feature{padding:26px}
  .hero-glow{width:600px;height:600px;right:-300px}
}