:root{
  --bg:#07090c;
  --bg-2:#0d1117;
  --card:#11161d;
  --card-2:#161d26;
  --line:#1f2833;
  --text:#e9eef4;
  --muted:#9aa6b4;
  --accent:#3df5a7;
  --accent-2:#18c98a;
  --accent-ink:#04120b;
  --warn:#ffcc66;
  --radius:16px;
  --max:1160px;
  --font:"Pretendard","Apple SD Gothic Neo","Malgun Gothic",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased;word-break:keep-all;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.accent{color:var(--accent)}
.muted{color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---------- header ---------- */
.topbar{background:linear-gradient(90deg,var(--accent-2),var(--accent));color:var(--accent-ink);text-align:center;font-size:14px;font-weight:700;padding:8px 12px}
.topbar a{text-decoration:underline}
header.site{position:sticky;top:0;z-index:50;background:rgba(7,9,12,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.02em}
.logo-mark{width:30px;height:30px;border-radius:9px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:900;font-size:15px}
.logo small{font-size:12px;font-weight:600;color:var(--muted);margin-left:2px}
.menu{display:flex;gap:26px;font-size:15px;color:var(--muted)}
.menu a:hover,.menu a.on{color:var(--text)}
.nav-cta{display:flex;gap:10px;align-items:center}
.burger{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:10px;width:40px;height:40px;font-size:18px;cursor:pointer}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:800;border-radius:12px;padding:14px 22px;font-size:16px;transition:.2s;cursor:pointer;border:0;font-family:inherit}
.btn-primary{background:var(--accent);color:var(--accent-ink);box-shadow:0 6px 20px rgba(61,245,167,.15)}
.btn-primary:hover{background:#6dffc0;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-sm{padding:9px 16px;font-size:14px;border-radius:10px}
.btn-lg{padding:18px 30px;font-size:18px}

/* ---------- hero ---------- */
.hero{position:relative;padding:84px 0 70px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-30% -10% auto;height:680px;background:radial-gradient(closest-side,rgba(61,245,167,.09),transparent 70%);pointer-events:none}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.badge{display:inline-flex;gap:8px;align-items:center;padding:6px 14px;border:1px solid rgba(61,245,167,.35);background:rgba(61,245,167,.08);color:var(--accent);border-radius:999px;font-size:13px;font-weight:700;margin-bottom:20px}
.hero h1{font-size:clamp(32px,5vw,54px);line-height:1.18;letter-spacing:-.035em;font-weight:900}
.hero p.lead{color:var(--muted);font-size:18px;margin:20px 0 30px;max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.hero-stats{display:flex;gap:28px;margin-top:36px;flex-wrap:wrap}
.hero-stats b{display:block;font-size:24px;font-weight:900;letter-spacing:-.02em}
.hero-stats span{font-size:13px;color:var(--muted)}

/* code card */
.code-card{background:linear-gradient(160deg,var(--card-2),var(--card));border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:0 30px 80px rgba(0,0,0,.45)}
.code-card .label{font-size:13px;color:var(--muted);font-weight:600}
.code-card .big{font-size:56px;font-weight:900;letter-spacing:-.04em;line-height:1.1;margin:6px 0 4px}
.code-card .big small{font-size:22px;font-weight:800}
.code-box{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--bg);border:1px dashed rgba(61,245,167,.5);border-radius:14px;padding:14px 16px;margin:22px 0 14px}
.code-box strong{font-size:22px;letter-spacing:.06em;color:var(--accent)}
.copy{background:var(--card-2);color:var(--text);border:1px solid var(--line);border-radius:10px;padding:8px 14px;font-weight:700;cursor:pointer;font-family:inherit;font-size:14px}
.copy:hover{border-color:var(--accent)}
.code-card ul{list-style:none;display:grid;gap:8px;margin:18px 0 22px;font-size:15px}
.code-card li::before{content:"✓";color:var(--accent);font-weight:900;margin-right:8px}
.code-card .btn{width:100%}

/* ---------- sections ---------- */
section{padding:80px 0}
section.alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:720px;margin-bottom:44px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{color:var(--accent);font-weight:800;font-size:14px;letter-spacing:.08em;text-transform:uppercase}
.sec-head h2{font-size:clamp(26px,3.6vw,38px);line-height:1.25;letter-spacing:-.03em;margin:10px 0 14px;font-weight:900}
.sec-head p{color:var(--muted);font-size:17px}

.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.card:hover{border-color:#2c3946}
.card .ico{width:46px;height:46px;border-radius:12px;background:rgba(61,245,167,.1);color:var(--accent);display:grid;place-items:center;font-size:22px;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:8px;letter-spacing:-.02em}
.card p{color:var(--muted);font-size:15px}

/* steps */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.step{position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px}
.step::before{counter-increment:s;content:"STEP " counter(s);display:inline-block;font-size:12px;font-weight:900;color:var(--accent-ink);background:var(--accent);padding:4px 10px;border-radius:999px;margin-bottom:14px}
.step h3{font-size:18px;margin-bottom:6px}
.step p{color:var(--muted);font-size:15px}

/* ---------- 가입 단계 카드 + 예시 화면(목업) ---------- */
.howto{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.howto-item{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;display:flex;flex-direction:column;gap:16px}
.howto-item .num{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.02em}
.howto-item .num i{font-style:normal;width:28px;height:28px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-size:14px;font-weight:900}
.howto-item p{color:var(--muted);font-size:15px;line-height:1.7}

.mock{background:#0a0e13;border:1px solid #233040;border-radius:12px;overflow:hidden;font-size:12.5px;color:#c9d3de;user-select:none}
.mock-bar{display:flex;align-items:center;gap:6px;padding:8px 10px;background:#121922;border-bottom:1px solid #1f2a36}
.mock-bar .d{width:8px;height:8px;border-radius:50%;background:#2a3644}
.mock-bar .url{margin-left:8px;flex:1;background:#0a0e13;border-radius:6px;padding:3px 10px;color:#7f8b99;font-size:11.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mock-body{padding:14px;display:grid;gap:9px}
.mock-row{display:flex;align-items:center;justify-content:space-between;gap:8px}
.mock-nav{display:flex;align-items:center;justify-content:space-between}
.mock-logo{font-weight:900;color:#e9eef4;letter-spacing:.02em}
.mock-dim{color:#6f7b89}
.mock-line{height:8px;border-radius:4px;background:#1a232e}
.mock-field{background:#121922;border:1px solid #233040;border-radius:8px;padding:8px 10px;display:flex;justify-content:space-between}
.mock-btn{background:#1a232e;border-radius:8px;padding:8px 12px;text-align:center;font-weight:700;color:#e9eef4}
.mock-btn.go{background:var(--accent);color:var(--accent-ink)}
.mock-btn.red{background:#3a1d24;color:#ff8a9a}
.mock .hit{position:relative;box-shadow:0 0 0 2px var(--accent),0 0 18px rgba(61,245,167,.45)}
.mock .tip{position:absolute;top:-24px;right:0;background:var(--accent);color:var(--accent-ink);font-size:11px;font-weight:800;padding:2px 8px;border-radius:6px;white-space:nowrap}
.mock .tip::after{content:"";position:absolute;bottom:-4px;right:12px;border:4px solid transparent;border-top-color:var(--accent);border-bottom:0}
.mock-list{display:grid;gap:6px}
.mock-list .mock-field{justify-content:flex-start;gap:8px}
.mock-cap{font-size:12px;color:var(--muted);text-align:center;margin-top:-6px}

/* 용어 정리 */
.terms{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:8px 0 20px}
.terms div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.terms b{display:block;color:var(--text);margin-bottom:4px}
.terms span{color:var(--muted);font-size:14.5px;line-height:1.65}

.checklist{list-style:none!important;padding:0!important}
.checklist li{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px 12px 42px;position:relative}
.checklist li::before{content:"✓";position:absolute;left:14px;top:11px;width:20px;height:20px;border-radius:50%;background:rgba(61,245,167,.15);color:var(--accent);display:grid;place-items:center;font-size:12px;font-weight:900}

.article .body .mock{margin:14px 0 6px;max-width:440px}

/* table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:560px}
th,td{padding:15px 18px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--card-2);color:var(--muted);font-weight:700;font-size:14px}
tr:last-child td{border-bottom:0}
td.hl,th.hl{color:var(--accent);font-weight:800}
.note{font-size:13px;color:var(--muted);margin-top:12px}

/* compare */
.compare .card.win{border-color:rgba(61,245,167,.5);background:linear-gradient(160deg,rgba(61,245,167,.08),var(--card))}
.compare ul{list-style:none;margin-top:12px;display:grid;gap:8px;font-size:15px}
.compare .win li::before{content:"●";color:var(--accent);margin-right:8px;font-size:10px;vertical-align:2px}
.compare .lose li::before{content:"●";color:#55606d;margin-right:8px;font-size:10px;vertical-align:2px}

/* faq */
.faq{display:grid;gap:12px;max-width:860px;margin:0 auto}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:0 22px}
.faq details[open]{border-color:#2c3946}
.faq summary{cursor:pointer;list-style:none;padding:20px 30px 20px 0;font-weight:700;font-size:17px;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:16px;font-size:24px;color:var(--accent);font-weight:400}
.faq details[open] summary::after{content:"−"}
.faq .a{color:var(--muted);padding:0 0 20px;font-size:15.5px}
.faq .a p+p{margin-top:8px}

/* cta band */
.cta-band{background:linear-gradient(120deg,#0f2a20,#0b1712 60%,#0d1117);border:1px solid rgba(61,245,167,.3);border-radius:24px;padding:52px 40px;text-align:center}
.cta-band h2{font-size:clamp(24px,3.4vw,36px);letter-spacing:-.03em;margin-bottom:12px;font-weight:900}
.cta-band p{color:var(--muted);margin-bottom:26px}

/* article (sub pages) */
.page-hero{padding:64px 0 36px;border-bottom:1px solid var(--line);background:radial-gradient(800px 300px at 20% 0,rgba(61,245,167,.12),transparent)}
.crumb{font-size:13px;color:var(--muted);margin-bottom:14px}
.crumb a:hover{color:var(--accent)}
.page-hero h1{font-size:clamp(28px,4.4vw,44px);letter-spacing:-.035em;line-height:1.22;font-weight:900}
.page-hero p{color:var(--muted);font-size:17px;margin-top:14px;max-width:720px}
.article .body{min-width:0}
.article{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;padding:50px 20px 80px}
.article .body h2{font-size:26px;letter-spacing:-.025em;margin:44px 0 14px;font-weight:900;scroll-margin-top:90px}
.article .body h2:first-child{margin-top:0}
.article .body h3{font-size:19px;margin:26px 0 8px}
.article .body p{color:#c6cfda;margin-bottom:14px}
.article .body ul,.article .body ol{color:#c6cfda;padding-left:22px;margin-bottom:16px;display:grid;gap:6px}
.article .body strong{color:var(--text)}
.callout{background:rgba(61,245,167,.07);border:1px solid rgba(61,245,167,.3);border-radius:14px;padding:18px 20px;margin:20px 0;color:#d7e2ec;font-size:15.5px}
.callout.warn{background:rgba(255,204,102,.07);border-color:rgba(255,204,102,.35)}
.aside{position:sticky;top:90px;align-self:start;display:grid;gap:16px}
.toc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.toc b{display:block;margin-bottom:10px;font-size:14px;color:var(--muted)}
.toc a{display:block;padding:6px 0;font-size:14.5px;color:#c6cfda}
.toc a:hover{color:var(--accent)}

/* footer */
footer{border-top:1px solid var(--line);padding:44px 0 110px;color:var(--muted);font-size:13.5px}
footer .cols{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;margin-bottom:24px}
footer nav{display:flex;gap:18px;flex-wrap:wrap}
footer nav a:hover{color:var(--accent)}
footer .disc{line-height:1.7;max-width:900px}

/* sticky mobile cta */
.sticky-cta{position:fixed;left:0;right:0;bottom:0;z-index:60;display:none;padding:12px 16px calc(12px + env(safe-area-inset-bottom));background:rgba(7,9,12,.94);border-top:1px solid var(--line);backdrop-filter:blur(10px)}
.sticky-cta .btn{width:100%;display:block;text-align:center}

.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(20px);background:var(--accent);color:var(--accent-ink);font-weight:800;padding:12px 20px;border-radius:12px;opacity:0;transition:.25s;z-index:80;pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .hero .wrap{grid-template-columns:1fr}
  .g4,.steps{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:1fr 1fr}
  .article{grid-template-columns:minmax(0,1fr)}
  .aside{position:static}
}
@media (max-width:760px){
  .menu{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;gap:0;background:var(--bg-2);border-bottom:1px solid var(--line);padding:8px 20px}
  .menu.open{display:flex}
  .menu a{padding:12px 0;border-bottom:1px solid var(--line)}
  .menu a:last-child{border:0}
  .burger{display:block}
  .nav-cta .btn{display:none}
  .nav{height:58px}
  .menu{top:58px}
  .logo{font-size:17px}
  .wrap{padding:0 16px}

  /* topbar: 한 줄로 */
  .topbar{font-size:13px;padding:7px 10px}
  .hide-m{display:none}

  /* section rhythm */
  section{padding:52px 0}
  .sec-head{margin-bottom:26px}
  .sec-head h2{font-size:25px;margin:8px 0 10px}
  .sec-head p{font-size:15.5px}
  .eyebrow{font-size:12.5px}

  /* hero */
  .hero{padding:36px 0 44px}
  .hero::before{height:420px}
  .hero .wrap{gap:28px}
  .badge{font-size:12px;margin-bottom:14px}
  .hero h1{font-size:31px;line-height:1.25}
  .hero p.lead{font-size:16px;margin:14px 0 22px}
  .hero-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .hero-actions .btn{padding:15px 10px;font-size:15.5px;width:100%}
  .hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:24px;padding:14px 0 0;border-top:1px solid var(--line)}
  .hero-stats b{font-size:17px;white-space:nowrap}
  .hero-stats span{font-size:12px;line-height:1.4;display:block;margin-top:2px}
  .code-card{padding:22px 20px;border-radius:18px}
  .code-card .big{font-size:42px}
  .code-card .big small{font-size:19px}
  .code-box{margin:16px 0 12px;padding:12px 14px}
  .code-card ul{margin:14px 0 18px;font-size:14.5px}

  /* cards → 아이콘 왼쪽 컴팩트형 */
  .g2,.g3,.g4,.steps{grid-template-columns:1fr;gap:12px}
  .card{padding:18px}
  .g4 .card{display:grid;grid-template-columns:42px 1fr;column-gap:14px;align-items:start}
  .g4 .card .ico{grid-row:span 2;width:42px;height:42px;font-size:20px;margin:0}
  .card h3{font-size:17px;margin-bottom:4px}
  .card p{font-size:14.5px;line-height:1.6}

  /* steps */
  .step{padding:18px;display:grid;grid-template-columns:auto 1fr;column-gap:12px;align-items:center}
  .step::before{margin:0;grid-row:span 2;align-self:start;margin-top:2px}
  .step h3{font-size:17px;margin:0}
  .step p{font-size:14.5px;grid-column:2}
  #how .btn-lg,.cta-band .btn-lg{width:100%;padding:16px 18px;font-size:16.5px}

  /* table: 가로 스크롤 없이 */
  table{min-width:0;font-size:13.5px}
  th,td{padding:12px 10px}
  th{font-size:12.5px}
  .note{font-size:13px;line-height:1.6}

  /* faq */
  .faq details{padding:0 16px}
  .faq summary{font-size:15.5px;padding:16px 26px 16px 0;line-height:1.45}
  .faq summary::after{top:12px}
  .faq .a{font-size:15px;line-height:1.7;padding-bottom:16px}

  .cta-band{padding:32px 18px;border-radius:18px}
  .cta-band h2{font-size:23px}
  .cta-band p{font-size:15px}

  /* sub page article */
  .page-hero{padding:34px 0 26px}
  .page-hero h1{font-size:27px}
  .page-hero p{font-size:15.5px}
  .article{padding:24px 16px 56px;gap:20px}
  .aside{order:-1}
  .aside .code-card{display:none}
  .toc{padding:14px 14px 10px}
  .toc b{margin-bottom:8px}
  .toc nav,.toc{display:block}
  .toc a{display:inline-block;padding:6px 11px;margin:0 4px 6px 0;border:1px solid var(--line);border-radius:999px;font-size:13px}
  .article .body h2{font-size:22px;margin:36px 0 12px}
  .article .body h3{font-size:17px}
  .article .body p,.article .body li{font-size:15.5px;line-height:1.75}
  .callout{font-size:14.5px;padding:14px 16px}

  footer{padding:36px 0 100px}
  footer nav{gap:4px 16px}
  footer nav a{padding:6px 0}
  footer .disc{font-size:12.5px}

  .sticky-cta{display:block}

  .howto{grid-template-columns:1fr;gap:12px}
  .howto-item{padding:18px;gap:12px}
  .howto-item .num{font-size:17px}
  .howto-item p{font-size:14.5px}
  .terms{grid-template-columns:1fr}
}