:root{
  --bg:#0b0d12;
  --card:#121621;
  --text:#e9eef7;
  --muted:#9aa7bd;
  --line:#1f2636;
  --accent:#6ee7ff;
  --btn:#1a2233;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Apple SD Gothic Neo,Noto Sans KR,sans-serif;background:var(--bg);color:var(--text)}
a{color:inherit;text-decoration:none}
.container{max-width:1024px;margin:0 auto;padding:16px}

.topbar{position:sticky;top:0;background:rgba(11,13,18,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:10}
.brand{font-weight:800;letter-spacing:-.3px}
.nav{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.nav a{padding:8px 10px;border:1px solid transparent;border-radius:10px;color:var(--muted)}
.nav a:hover{border-color:var(--line);color:var(--text)}
.nav a[aria-current="page"]{border-color:var(--accent);color:var(--text)}
.nav .muted{color:var(--muted)}
.disabled{opacity:.55;pointer-events:none}

.hero{padding:22px 18px;border:1px solid var(--line);border-radius:16px;background:linear-gradient(180deg, rgba(110,231,255,.08), rgba(18,22,33,.2));}
.hero.small{padding:16px 18px}
h1{margin:0 0 10px;font-size:28px;letter-spacing:-.6px}
.lead{margin:0;color:var(--muted);line-height:1.6}
.meta{margin:12px 0 0;color:var(--muted);font-size:13px}

.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:12px;margin-top:12px}
.grid.two{grid-template-columns:repeat(12,1fr)}
.card{grid-column:span 12;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px}
.card h2{margin:0 0 8px;font-size:18px}
.card p{margin:6px 0;color:var(--muted);line-height:1.6}

@media (min-width:900px){
  .grid > .card{grid-column:span 6}
  .grid.two > .card{grid-column:span 6}
}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--btn);border:1px solid var(--line);color:var(--text);
  padding:10px 14px;border-radius:12px;font-weight:700;cursor:pointer}
.btn:hover{border-color:var(--accent)}
.btn.ghost{background:transparent}
.cta-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}

.pill{display:inline-block;margin-left:8px;padding:2px 8px;border-radius:999px;border:1px solid var(--line);color:var(--muted);font-size:12px}

.field{display:flex;flex-direction:column;gap:6px;margin-top:10px}
.field span{font-size:13px;color:var(--muted)}
.field input{padding:11px 12px;border-radius:12px;border:1px solid var(--line);background:#0f1320;color:var(--text);font-size:16px}
.field input:focus{outline:none;border-color:var(--accent)}
.hint{color:var(--muted);font-size:12px;line-height:1.5}
.divider{height:1px;background:var(--line);margin:12px 0}

.result{border:1px solid var(--line);border-radius:14px;padding:12px;background:#0f1320}
.result-row{display:flex;align-items:center;justify-content:space-between;padding:10px 8px;border-bottom:1px dashed rgba(31,38,54,.8)}
.result-row:last-child{border-bottom:none}
.result-row span{color:var(--muted)}
.result-row b{font-size:16px}
.result-row.highlight b{font-size:18px}

.details{margin-top:12px}
details summary{cursor:pointer;color:var(--text);font-weight:700}
.list{margin:8px 0 0;padding-left:18px;color:var(--muted);line-height:1.7}
.h3{margin:0 0 6px;font-size:15px;color:var(--text)}

.ad-slot{margin:14px 0;padding:14px;border-radius:14px;border:1px dashed rgba(110,231,255,.35);color:rgba(110,231,255,.8);text-align:center;background:rgba(110,231,255,.06)}

.breadcrumbs{margin:12px 0;color:var(--muted);font-size:13px;display:flex;gap:8px;align-items:center}
.footer{margin-top:18px;border-top:1px solid var(--line);color:var(--muted)}