:root{
  --bg:#0b0b0d;
  --panel:#101014;
  --panel2:#0f0f12;
  --text:#f5f5f7;
  --muted:#a8a8b3;
  --border:rgba(255,255,255,.10);
  --border2:rgba(255,255,255,.16);
  --shadow: 0 12px 40px rgba(0,0,0,.55);
  --radius: 18px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, "Noto Sans KR", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: radial-gradient(1200px 600px at 50% -20%, rgba(255,255,255,.08), transparent 60%),
              radial-gradient(900px 500px at 10% 20%, rgba(255,255,255,.05), transparent 60%),
              var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a{color:inherit; text-decoration:none}
a:hover{opacity:.92}

.skip{
  position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden;
}
.skip:focus{
  left:16px; top:16px; width:auto; height:auto;
  padding:10px 12px; background:#fff; color:#000; border-radius:10px; z-index:99;
}

.container{max-width:1100px; margin:0 auto; padding:0 18px}

.header{
  position:sticky; top:0; z-index:50;
  background: rgba(10,10,12,.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.header .container{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 18px;
}
.brand{display:flex; gap:12px; align-items:center}
.logo{
  width:36px; height:36px; border-radius:12px;
  display:grid; place-items:center;
  background: linear-gradient(180deg, rgba(255,255,255,.18), rgba(255,255,255,.04));
  border:1px solid var(--border2);
  font-weight:800;
}
.brand__title{font-weight:700; letter-spacing:.2px}
.brand__sub{font-size:12px; color:var(--muted)}

.nav{display:flex; gap:14px}
.nav__link{
  font-size:14px; color:var(--muted);
  padding:8px 10px; border-radius:12px;
}
.nav__link:hover{background: rgba(255,255,255,.06); color: var(--text)}

.main{padding-bottom:40px}

.hero{padding:42px 0 22px}
.pill{
  display:inline-flex; align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.04);
  border-radius:999px;
  color: var(--muted);
  font-size:13px;
}
.hero h1{
  margin:14px 0 10px;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing:-.6px;
}
.lead{
  margin:0;
  max-width: 70ch;
  color: var(--muted);
  font-size: 16px;
}

.cta{
  margin-top:18px;
  display:grid;
  gap:12px;
  grid-template-columns: 1fr;
}
@media (min-width: 860px){
  .cta{grid-template-columns: 1.1fr .9fr}
}

.codebox, .linkbox{
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding:14px;
  display:grid;
  gap:10px;
  align-items:center;
  grid-template-columns: 110px 1fr auto;
}
.linkbox__value{
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
  color: var(--text);
}
.codebox__label,.linkbox__label{font-size:12px; color:var(--muted)}
.codebox__value{font-size:22px; font-weight:800; letter-spacing:1px}

.mono{font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace}

.btn{
  border:1px solid var(--border2);
  background: rgba(255,255,255,.06);
  color: var(--text);
  padding:10px 12px;
  border-radius: 14px;
  font-weight:700;
  font-size:14px;
  cursor:pointer;
  transition: transform .08s ease, background .18s ease, border-color .18s ease;
}
.btn:hover{background: rgba(255,255,255,.10)}
.btn:active{transform: translateY(1px)}
.btn--primary{
  background: #fff;
  color:#000;
  border-color:#fff;
}
.btn--primary:hover{background: rgba(255,255,255,.92)}
.btn--ghost{
  background: transparent;
}
.note{
  margin-top:16px;
  border:1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255,255,255,.03);
  padding:14px;
}
.note__title{font-weight:800; margin-bottom:8px}
.note__list{margin:0; padding-left:18px; color: var(--muted)}
.note__list b{color: var(--text)}

.section{padding:24px 0}
.section__head{display:flex; flex-direction:column; gap:6px; margin-bottom:14px}
.section__head h2{
  margin:0;
  font-size: 22px;
}
.section__sub{margin:0; color: var(--muted); font-size:14px}

.grid{
  display:grid;
  gap:14px;
  grid-template-columns: 1fr;
}
@media (min-width: 860px){
  .grid{grid-template-columns: repeat(3, 1fr)}
}

.card{
  border:1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  box-shadow: var(--shadow);
  padding:14px;
  display:flex;
  flex-direction:column;
  gap:12px;
  min-height: 210px;
}
.card__top h3{margin:0; font-size:16px; letter-spacing:-.2px}
.card__top p{margin:6px 0 0; color: var(--muted); font-size:14px}
.tag{
  display:inline-flex;
  align-self:flex-start;
  font-size:12px;
  color: var(--muted);
  border:1px solid var(--border);
  background: rgba(255,255,255,.03);
  padding:6px 10px;
  border-radius: 999px;
  margin-bottom:8px;
}
.card__actions{margin-top:auto}

.section--narrow .callout{
  border:1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255,255,255,.03);
  padding:16px;
}
.callout h2{margin:0 0 6px; font-size:18px}
.callout p{margin:0; color: var(--muted)}
.callout b{color: var(--text)}

.faq{
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:12px 14px;
  background: rgba(255,255,255,.03);
  margin-bottom:10px;
}
.faq summary{
  cursor:pointer;
  font-weight:800;
}
.faq p{margin:8px 0 0; color: var(--muted)}
.disclaimer{
  margin-top:12px;
  color: var(--muted);
  font-size:13px;
}

.ad{
  margin-top:14px;
  border:1px dashed rgba(255,255,255,.22);
  border-radius: var(--radius);
  padding:10px;
  background: rgba(255,255,255,.02);
}

.footer{
  border-top:1px solid var(--border);
  background: rgba(10,10,12,.60);
}
.footer__inner{
  display:flex; justify-content:space-between; align-items:center;
  padding:18px;
  gap:12px;
  flex-wrap:wrap;
}
.footer__brand{font-weight:800}
.footer__sub{font-size:12px; color: var(--muted)}
.footer__links{display:flex; gap:14px; color: var(--muted); font-size:14px}
.footer__links a:hover{color: var(--text)}

.toast{
  position: fixed;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  background: rgba(255,255,255,.92);
  color:#000;
  padding:10px 12px;
  border-radius: 999px;
  font-weight:800;
  font-size:13px;
  box-shadow: 0 10px 30px rgba(0,0,0,.45);
  opacity:0;
  pointer-events:none;
  transition: opacity .18s ease, transform .18s ease;
}
.toast.show{
  opacity:1;
  transform: translateX(-50%) translateY(-2px);
}