:root{
  --bg:#0c1016;--paper:#131a24;--card:#1a2431;--line:#2b3a4c;
  --ink:#e8eef5;--mut:#93a3b8;--acc:#3ec6e0;--acc2:#2f9bbd;
  --maxw:1100px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:-apple-system,"Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;line-height:1.75}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
ul.list{margin:12px 0 0 20px}ul.list li{margin-bottom:8px}
a{color:var(--acc)}a:hover{opacity:.85}

header.site{position:sticky;top:0;z-index:50;background:rgba(12,16,22,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800}
.logo .mark{width:38px;height:38px;border-radius:8px;background:linear-gradient(135deg,var(--acc),#7a5fe0);color:#fff;display:grid;place-items:center;font-size:1.1rem}
.logo .word{font-size:1.25rem}
.logo .tag{font-size:.7rem;color:var(--acc);border:1px solid var(--acc);padding:1px 7px;border-radius:999px}
nav.main{display:flex;gap:16px;align-items:center;font-size:.92rem}
nav.main a{color:var(--mut);font-weight:600;padding:6px 2px;border-bottom:2px solid transparent}
nav.main a:hover,nav.main a.active{color:var(--acc);border-color:var(--acc)}
.nav-toggle{display:none;background:none;border:0;font-size:1.7rem;color:var(--ink);cursor:pointer}

.btn{display:inline-block;background:var(--acc);color:#06242b;padding:12px 28px;border-radius:8px;font-weight:700;font-size:.95rem}
.btn.ghost{background:transparent;color:var(--acc);border:1px solid var(--acc)}
.btn.sm{padding:7px 16px;font-size:.85rem}
.btn:hover{filter:brightness(1.1)}

.hero{background:linear-gradient(160deg,#0e2230,#0c1016 55%,#13102a)}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:36px;padding:64px 22px 70px;align-items:center}
.kicker{display:inline-block;font-size:.72rem;letter-spacing:.24em;color:var(--acc);font-weight:700;margin-bottom:14px}
.hero h1{font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.3;margin-bottom:16px}
.lede{color:var(--mut);font-size:1.06rem;max-width:56ch}
.hero-cta{display:flex;gap:14px;margin-top:24px;flex-wrap:wrap}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.cell{aspect-ratio:1/1;border-radius:12px;background:linear-gradient(150deg,#1b2c44,#111a28);border:1px solid var(--line);position:relative}
.cell::before{content:"";position:absolute;inset:18%;border:2px solid var(--acc);border-radius:50%;opacity:.5;border-top-color:transparent;animation:spin 6s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.cell:nth-child(2){background:linear-gradient(150deg,#1b1c44,#141028)}

.sec{padding:58px 0}
.sec.alt{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.h1{font-size:clamp(1.7rem,3.4vw,2.35rem);line-height:1.3;margin-bottom:14px}
.h2{font-size:clamp(1.2rem,2.2vw,1.5rem);margin-bottom:16px}
.sec p{margin-bottom:13px;color:var(--mut)}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
.card h3{margin-bottom:9px;color:var(--acc);font-size:1.02rem}
.card p{font-size:.92rem;margin-bottom:0}
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:start}
.panel{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--acc);border-radius:10px;padding:22px}
.panel h3{margin-bottom:10px}
.narrow{max-width:820px}
.qa .q{font-size:1.08rem;color:var(--acc);margin:24px 0 6px}

footer.site{border-top:1px solid var(--line);padding:28px 0;background:#0a0e13}
.foot{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:var(--mut);font-size:.9rem}
@media(max-width:920px){
  .hero .wrap,.split{grid-template-columns:1fr}
  .cards{grid-template-columns:repeat(2,1fr)}
  .nav-toggle{display:block}
  nav.main{display:none;position:absolute;top:64px;left:0;right:0;background:#0c1016;border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;padding:14px 22px;gap:14px}
  nav.main.open{display:flex}
}
@media(max-width:540px){.cards{grid-template-columns:1fr}.foot{flex-direction:column}}