:root{
  --bg:#070b16; --bg2:#0c1222; --card:#101830; --line:#1e2a48;
  --text:#e8edf8; --muted:#93a0bd; --blue:#4f8cff; --mint:#22e3c4; --sun:#ffc94d;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:Pretendard,-apple-system,"Malgun Gothic",sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}

.nav{position:fixed;inset:0 0 auto 0;z-index:10;display:flex;justify-content:space-between;align-items:center;padding:18px clamp(16px,5vw,64px);background:rgba(7,11,22,.6);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.05)}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.08em}
.logo b{color:var(--mint);font-weight:800}
.nav nav{display:flex;gap:clamp(14px,3vw,32px);font-size:15px;color:var(--muted)}
.nav nav a:hover{color:var(--text)}

.hero{position:relative;min-height:100vh;display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:40px;padding:120px clamp(16px,5vw,64px) 60px;overflow:hidden}
#grid{position:absolute;inset:0;width:100%;height:100%;opacity:.55}
.hero::after{content:"";position:absolute;width:720px;height:720px;right:-200px;top:-160px;background:radial-gradient(circle,rgba(79,140,255,.25),transparent 65%);pointer-events:none}
.hero-inner{position:relative;z-index:1}
.eyebrow{font-size:13px;letter-spacing:.22em;color:var(--mint);font-weight:700;margin-bottom:16px}
h1{font-size:clamp(34px,5.4vw,64px);line-height:1.18;font-weight:800;letter-spacing:-.02em}
.grad{background:linear-gradient(90deg,var(--blue),var(--mint));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{margin-top:22px;font-size:clamp(16px,1.6vw,19px);color:var(--muted);max-width:560px}
.cta{display:flex;gap:12px;margin-top:34px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 26px;border-radius:12px;font-weight:700;font-size:15px;transition:.2s}
.btn.primary{background:linear-gradient(90deg,var(--blue),var(--mint));color:#04101f}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(34,227,196,.25)}
.btn.ghost{border:1px solid var(--line);color:var(--text)}
.btn.ghost:hover{border-color:var(--mint)}
.hero-art{position:relative;z-index:1;max-width:520px;justify-self:center;width:100%}
.flow{animation:dash 2.4s linear infinite}
@keyframes dash{to{stroke-dashoffset:-56}}
.leds circle{animation:blink 2s ease-in-out infinite}
.leds circle:nth-child(4n){animation-delay:.6s}
@keyframes blink{50%{opacity:.25}}

.section{padding:110px clamp(16px,5vw,64px)}
.section.alt{background:var(--bg2)}
.sec-head{max-width:720px;margin-bottom:56px}
.sec-head h2,.contact h2{font-size:clamp(28px,3.6vw,42px);font-weight:800;letter-spacing:-.02em}
.sec-head p:not(.eyebrow){color:var(--muted);margin-top:12px;font-size:17px}

.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:linear-gradient(180deg,var(--card),#0b1226);border:1px solid var(--line);border-radius:20px;padding:30px 26px;transition:.25s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 0 0,rgba(34,227,196,.12),transparent 60%);opacity:0;transition:.25s}
.card:hover{transform:translateY(-6px);border-color:rgba(34,227,196,.5)}
.card:hover::before{opacity:1}
.icon{width:56px;height:56px;border-radius:14px;display:grid;place-items:center;background:rgba(79,140,255,.12);color:var(--mint);margin-bottom:22px}
.icon svg{width:34px;height:34px}
.card:nth-child(4) .icon{color:var(--sun);background:rgba(255,201,77,.12)}
.card h3{font-size:21px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}
.card ul{list-style:none;margin-top:18px;display:flex;flex-wrap:wrap;gap:8px}
.card li{font-size:13px;padding:5px 11px;border-radius:99px;border:1px solid var(--line);color:#c4cde2}

.why{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.why-item{padding:32px;border-radius:20px;border:1px solid var(--line);background:rgba(16,24,48,.5)}
.num{font-size:14px;font-weight:800;color:var(--blue);letter-spacing:.1em}
.why-item h4{font-size:20px;margin:12px 0 8px}
.why-item p{color:var(--muted);font-size:15px}

.contact-box{display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;padding:56px;border-radius:28px;background:linear-gradient(120deg,rgba(79,140,255,.18),rgba(34,227,196,.12));border:1px solid rgba(79,140,255,.35)}
.contact-box p:not(.eyebrow){color:var(--muted);margin-top:10px}

.footer{border-top:1px solid var(--line);padding:40px clamp(16px,5vw,64px)}
.foot-inner{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.footer nav{display:flex;gap:22px;color:var(--muted);font-size:14px}
.copy{color:#5f6b87;font-size:13px;width:100%}

/* notice page */
.page{padding:140px clamp(16px,5vw,64px) 100px;max-width:1000px;margin:0 auto}
.page h1{font-size:clamp(30px,4vw,44px)}
.page .desc{color:var(--muted);margin:12px 0 40px}
.board{width:100%;border-collapse:collapse;border-top:2px solid var(--blue)}
.board th,.board td{padding:16px 12px;border-bottom:1px solid var(--line);text-align:left;font-size:15px}
.board th{color:var(--muted);font-weight:600;font-size:14px}
.board .empty{text-align:center;color:var(--muted);padding:60px 12px}

.reveal{opacity:0;transform:translateY(24px);transition:.7s ease}
.reveal.on{opacity:1;transform:none}

@media (max-width:1024px){
  .cards{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .hero{grid-template-columns:1fr;padding-top:110px;text-align:left}
  .hero-art{max-width:360px}
  .nav nav a:not(:last-child):not(:first-child){display:none}
  .cards,.why{grid-template-columns:1fr}
  .contact-box{padding:32px}
  .board th:nth-child(1),.board td:nth-child(1){display:none}
}