:root{
  --bg:#05070b; --ink:#eef1f6; --muted:#8a93a5; --line:rgba(255,255,255,.08);
  --panel:rgba(255,255,255,.025); --a1:#7cc4ff; --a2:#b58cff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);word-break:keep-all;overflow-wrap:anywhere;
  font:16px/1.7 "Pretendard","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  background-image:
    radial-gradient(1px 1px at 12% 18%,#fff8 50%,transparent 51%),
    radial-gradient(1px 1px at 72% 9%,#fff6 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 88% 32%,#fff9 50%,transparent 51%),
    radial-gradient(1px 1px at 34% 44%,#fff5 50%,transparent 51%),
    radial-gradient(1px 1px at 58% 66%,#fff6 50%,transparent 51%),
    radial-gradient(1.5px 1.5px at 6% 78%,#fff7 50%,transparent 51%),
    radial-gradient(1px 1px at 92% 86%,#fff5 50%,transparent 51%),
    radial-gradient(900px 520px at 80% -10%,rgba(80,110,220,.22),transparent 60%),
    radial-gradient(700px 500px at -10% 40%,rgba(140,90,220,.12),transparent 60%);
  background-attachment:fixed}
a{color:var(--a1);text-decoration:none}
.muted{color:var(--muted)}

/* header */
.top{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:16px clamp(16px,5vw,56px);background:rgba(5,7,11,.72);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;letter-spacing:.28em;font-size:1.05rem}
.logo-mark{width:18px;height:18px;border:2px solid var(--ink);border-radius:4px;transform:rotate(45deg);position:relative}
.logo-mark::after{content:"";position:absolute;inset:4px;background:linear-gradient(135deg,var(--a1),var(--a2));border-radius:1px}
.top nav{display:flex;gap:clamp(12px,2.4vw,28px);align-items:center;font-size:.92rem}
.top nav a{color:var(--muted)}.top nav a:hover{color:var(--ink)}
.top nav .nav-cta{color:var(--ink);border:1px solid var(--line);padding:6px 14px;border-radius:999px}

/* hero */
.hero{position:relative;overflow:hidden;min-height:calc(100vh - 64px);display:flex;flex-direction:column;justify-content:center;
  padding:80px clamp(16px,8vw,120px)}
.eyebrow,.kicker{font-size:.78rem;letter-spacing:.32em;color:var(--a1);margin:0 0 18px}
.hero h1{font-size:clamp(2.2rem,6.4vw,4.8rem);line-height:1.12;letter-spacing:-.03em;margin:0 0 26px;font-weight:800;max-width:14ch;position:relative}
.hero-sub{max-width:560px;color:#c3c9d6;font-size:clamp(1rem,1.6vw,1.12rem);margin:0 0 36px;position:relative}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;position:relative}
.orbit{position:absolute;right:-12vw;top:50%;width:min(78vw,820px);aspect-ratio:1;transform:translateY(-50%);pointer-events:none}
.orbit span{position:absolute;inset:0;border:1px solid rgba(124,196,255,.16);border-radius:50%;transform:rotateX(68deg) rotateZ(-18deg)}
.orbit span:nth-child(2){inset:12%;border-color:rgba(181,140,255,.18);transform:rotateX(68deg) rotateZ(24deg)}
.orbit span:nth-child(3){inset:30%;border-color:rgba(255,255,255,.12);transform:rotateX(68deg) rotateZ(60deg)}
.orbit span::after{content:"";position:absolute;top:-4px;left:50%;width:8px;height:8px;border-radius:50%;background:var(--a1);box-shadow:0 0 18px var(--a1)}
@media (prefers-reduced-motion:no-preference){
  .orbit{animation:drift 60s linear infinite}
}
@keyframes drift{to{transform:translateY(-50%) rotate(360deg)}}

.btn{display:inline-block;padding:13px 22px;border-radius:999px;border:1px solid var(--line);color:var(--ink);font-weight:600;font-size:.95rem;background:var(--panel)}
.btn:hover{border-color:rgba(255,255,255,.25)}
.btn.primary{background:linear-gradient(135deg,#3d7bd9,#7a55d6);border-color:transparent;color:#fff}

/* sections */
.section{padding:clamp(72px,11vw,140px) clamp(16px,8vw,120px);border-top:1px solid var(--line)}
.section h2{font-size:clamp(1.6rem,3.6vw,2.6rem);letter-spacing:-.02em;line-height:1.25;margin:0 0 44px;max-width:22ch}
.pillars{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.pillars article,.field{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:26px}
.pillars h3,.field h3{margin:0 0 10px;font-size:1.12rem}
.pillars p,.field p{margin:0;color:var(--muted);font-size:.95rem}
.fields{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.field{transition:border-color .2s,transform .2s}
.field:hover{border-color:rgba(124,196,255,.35);transform:translateY(-3px)}
.field .code{display:inline-block;font:600 .75rem/1 ui-monospace,Menlo,Consolas,monospace;letter-spacing:.24em;color:var(--a1);margin-bottom:16px}
.field.cross{background:linear-gradient(160deg,rgba(122,85,214,.16),var(--panel))}
.field.cross .code{color:var(--a2)}

.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:0;counter-reset:s}
.flow li{counter-increment:s;padding:22px 20px 0 0;border-top:1px solid rgba(124,196,255,.35);position:relative}
.flow li::before{content:"0" counter(s);position:absolute;top:-11px;left:0;background:var(--bg);padding-right:10px;
  font:600 .75rem/20px ui-monospace,Menlo,Consolas,monospace;color:var(--a1);letter-spacing:.2em}
.flow b{display:block;font-size:1.15rem;margin-bottom:6px}
.flow span{color:var(--muted);font-size:.92rem}

.empty{border:1px dashed rgba(255,255,255,.14);border-radius:18px;padding:44px 28px;text-align:center}
.empty p{margin:.3em 0}
.contact p{color:#c3c9d6;max-width:620px;margin:0 0 30px}

.foot{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:28px clamp(16px,8vw,120px);border-top:1px solid var(--line);font-size:.85rem;color:#c3c9d6}

@media (max-width:860px){
  .flow{grid-template-columns:1fr;gap:26px}
  .flow li{padding-top:18px}
}
@media (max-width:640px){
  .top nav a:not(.nav-cta){display:none}
  .hero{min-height:auto;padding-top:72px;padding-bottom:88px}
  .orbit{right:-40vw;width:120vw;opacity:.6}
}