:root{
  --bg:#0d1117;
  --bg-soft:#131a23;
  --panel:#161d27;
  --panel-2:#1b2431;
  --line:#26303d;
  --txt:#e6edf3;
  --txt-dim:#a9b6c6;
  --accent:#1f8f4e;
  --accent-2:#2ec26b;
  --accent-soft:rgba(46,194,107,.12);
  --warn:#e8b339;
  --radius:14px;
  --maxw:1080px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Apple SD Gothic Neo","Malgun Gothic","Noto Sans KR",Roboto,Helvetica,Arial,sans-serif;
  font-size:17px;
  line-height:1.75;
  -webkit-text-size-adjust:100%;
}
img{max-width:100%}
a{color:var(--accent-2);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(13,17,23,.92);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:66px}
.logo{display:inline-flex;align-items:center;gap:10px;color:var(--txt);font-weight:800;letter-spacing:-.4px}
.logo:hover{text-decoration:none}
.logo-mark{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:44px;height:30px;padding:0 9px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#04140a;border-radius:8px;font-size:15px;font-weight:900;line-height:1;
}
.logo-text{font-size:20px}
.logo-text .apk{color:var(--accent-2)}
.logo-sub{display:block;font-size:11px;font-weight:600;color:var(--txt-dim);letter-spacing:.10em;text-transform:uppercase}

.header-nav{display:flex;align-items:center;gap:10px}
.lang-switch{display:inline-flex;border:1px solid var(--line);border-radius:9px;overflow:hidden}
.lang-switch a{
  display:block;padding:6px 12px;font-size:13px;font-weight:700;color:var(--txt-dim);
  background:var(--panel);
}
.lang-switch a:hover{text-decoration:none;color:var(--txt)}
.lang-switch a.is-active{background:var(--accent-soft);color:var(--accent-2)}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;padding:13px 26px;border-radius:11px;
  font-weight:800;font-size:16px;text-align:center;
  border:1px solid transparent;transition:transform .12s ease,filter .12s ease;
}
.btn:hover{text-decoration:none;filter:brightness(1.07);transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04140a}
.btn-ghost{background:var(--panel-2);color:var(--txt);border-color:var(--line)}
.btn-sm{padding:8px 16px;font-size:14px;border-radius:9px}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 6px}

/* ---------- hero ---------- */
.hero{
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(900px 380px at 12% -10%,rgba(46,194,107,.16),transparent 60%),
    radial-gradient(700px 340px at 92% 0%,rgba(31,143,78,.10),transparent 62%),
    var(--bg-soft);
  padding:52px 0 44px;
}
.eyebrow{
  display:inline-block;padding:5px 12px;border-radius:999px;
  background:var(--accent-soft);color:var(--accent-2);
  font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;
  border:1px solid rgba(46,194,107,.25);
}
h1{font-size:38px;line-height:1.28;margin:16px 0 14px;letter-spacing:-.6px}
.lead{font-size:18px;color:var(--txt-dim);margin:0}

.quick-facts{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:30px}
.fact{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px}
.fact dt{font-size:12px;color:var(--txt-dim);letter-spacing:.05em;text-transform:uppercase;margin:0 0 4px}
.fact dd{margin:0;font-size:16px;font-weight:700}

/* ---------- layout ---------- */
main{padding:34px 0 10px}
.content section{margin:0 0 34px;scroll-margin-top:84px}
h2{font-size:26px;line-height:1.35;margin:36px 0 12px;letter-spacing:-.4px;border-left:4px solid var(--accent);padding-left:12px}
h3{font-size:19px;margin:24px 0 8px}
p{margin:0 0 14px}
ul,ol{margin:0 0 16px;padding-left:22px}
li{margin:6px 0}
strong{color:#fff}

/* ---------- toc ---------- */
.toc{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px 22px;margin:0 0 34px}
.toc h2{font-size:17px;margin:0 0 10px;border:0;padding:0}
.toc ol{columns:2;column-gap:28px;margin:0;padding-left:20px;font-size:15px}
.toc a{color:var(--txt-dim)}
.toc a:hover{color:var(--accent-2)}

/* ---------- cards ---------- */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:18px 0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px}
.card h3{margin:0 0 6px;font-size:17px;color:var(--accent-2)}
.card p{margin:0;font-size:15px;color:var(--txt-dim)}

/* ---------- steps ---------- */
.steps{list-style:none;counter-reset:st;padding:0;margin:16px 0}
.steps li{
  counter-increment:st;position:relative;padding:12px 16px 12px 54px;margin:0 0 10px;
  background:var(--panel);border:1px solid var(--line);border-radius:12px;
}
.steps li::before{
  content:counter(st);position:absolute;left:14px;top:12px;
  width:26px;height:26px;border-radius:8px;
  background:var(--accent-soft);color:var(--accent-2);
  font-weight:800;font-size:14px;display:flex;align-items:center;justify-content:center;
}

/* ---------- promo box ---------- */
.promo{
  background:linear-gradient(135deg,rgba(46,194,107,.14),rgba(31,143,78,.05));
  border:1px solid rgba(46,194,107,.35);
  border-radius:var(--radius);padding:22px 24px;margin:26px 0;
}
.promo h3{margin:0 0 8px;font-size:19px}
.promo p{color:var(--txt-dim);margin:0 0 14px}
.promo-code{
  display:inline-block;padding:10px 22px;margin:0 0 14px;
  background:#04140a;border:1px dashed var(--accent-2);border-radius:10px;
  color:var(--accent-2);font-size:24px;font-weight:900;letter-spacing:.16em;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- table ---------- */
.table-wrap{overflow-x:auto;margin:16px 0}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:520px}
caption{caption-side:top;text-align:left;color:var(--txt-dim);font-size:14px;padding-bottom:8px}
th,td{border:1px solid var(--line);padding:10px 13px;text-align:left;vertical-align:top}
th{background:var(--panel-2);font-weight:700}
td{background:var(--panel)}

/* ---------- faq ---------- */
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:0;margin:0 0 10px}
.faq summary{cursor:pointer;padding:14px 18px;font-weight:700;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--accent-2);font-weight:900}
.faq details[open] summary::after{content:"-"}
.faq .answer{padding:0 18px 14px;color:var(--txt-dim)}

/* ---------- cta strip ---------- */
.cta-strip{
  background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;margin:34px 0;text-align:center;
}
.cta-strip h2{border:0;padding:0;margin:0 0 8px;font-size:22px}
.cta-strip p{color:var(--txt-dim);margin:0 0 16px}

/* ---------- notice ---------- */
.notice{
  background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--warn);
  border-radius:10px;padding:14px 18px;margin:20px 0;font-size:15px;color:var(--txt-dim);
}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--bg-soft);margin-top:40px;padding:30px 0 40px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:24px}
.site-footer h4{margin:0 0 10px;font-size:14px;letter-spacing:.06em;text-transform:uppercase;color:var(--txt-dim)}
.site-footer ul{list-style:none;padding:0;margin:0;font-size:15px}
.site-footer li{margin:5px 0}
.footer-note{margin-top:26px;padding-top:18px;border-top:1px solid var(--line);font-size:13px;color:var(--txt-dim)}
.age{display:inline-block;border:1px solid var(--line);border-radius:6px;padding:1px 7px;font-weight:800;margin-right:8px;color:var(--txt)}

@media(max-width:860px){
  .quick-facts{grid-template-columns:repeat(2,1fr)}
  .cards{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .toc ol{columns:1}
  h1{font-size:29px}
  h2{font-size:22px}
  body{font-size:16px}
  .logo-text{font-size:18px}
  .hero{padding:36px 0 32px}
}
@media(max-width:480px){
  .quick-facts{grid-template-columns:1fr}
  .btn{width:100%}
}