:root{
  --brand:#C56A40; --brand-dark:#A4502B; --pop:#E8915C; --paper:#FBF6F1;
  --ink:#33291F; --muted:#8C7B6C; --cream:#F6EAE0; --line:#EADBCE;
}
*{box-sizing:border-box; margin:0; padding:0}
body{background:var(--paper); color:var(--ink); line-height:1.7;
  font-family:"Pretendard","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif}
a{color:inherit}
img{max-width:100%; display:block}

/* top bar */
.nav{position:sticky; top:0; z-index:40; background:rgba(251,246,241,.92); backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line); display:flex; align-items:center; gap:14px; padding:12px 20px}
.nav .logo{font-weight:800; color:var(--brand-dark)}
.nav .sp{flex:1}
.nav a.link{font-size:14px; color:var(--muted); text-decoration:none; padding:6px 10px}
.lang{display:flex; border:1px solid var(--line); border-radius:30px; overflow:hidden}
.lang button{border:0; background:#fff; padding:6px 12px; font-size:13px; font-weight:700; cursor:pointer; color:var(--muted)}
.lang button.on{background:var(--brand); color:#fff}

.wrap{max-width:980px; margin:0 auto; padding:0 22px}
.btn{display:inline-block; background:var(--brand); color:#fff !important; font-weight:800; font-size:17px;
  padding:14px 28px; border-radius:12px; text-decoration:none; border:0; cursor:pointer;
  box-shadow:0 8px 22px rgba(165,80,43,.28); transition:.12s}
.btn:hover{background:var(--brand-dark); transform:translateY(-1px)}
.btn.ghost{background:#fff; color:var(--brand-dark) !important; border:1.5px solid var(--brand); box-shadow:none}

/* hero */
.hero{display:grid; grid-template-columns:1.1fr .9fr; gap:40px; align-items:center; padding:60px 0}
.hero .eyebrow{display:inline-block; background:var(--cream); color:var(--brand-dark); font-weight:800;
  font-size:13px; letter-spacing:1px; padding:6px 14px; border-radius:30px; margin-bottom:16px}
.hero h1{font-size:42px; font-weight:900; line-height:1.25; letter-spacing:-1px}
.hero p.sub{font-size:18px; color:#5a4d42; margin:16px 0 26px}
.hero .cta{display:flex; gap:12px; flex-wrap:wrap}
.hero .cover{border-radius:16px; box-shadow:0 24px 60px rgba(120,70,40,.25); max-width:330px; margin:0 auto}
.badges{display:flex; gap:10px; flex-wrap:wrap; margin-top:22px}
.badge{background:#fff; border:1px solid var(--line); border-radius:30px; padding:6px 14px; font-size:13px; font-weight:600; color:var(--muted)}

/* buy section */
.buy{background:#fff; border:1px solid var(--line); border-radius:20px; padding:34px; margin:30px 0; text-align:center}
.buy .price{font-size:40px; font-weight:900; color:var(--brand-dark)}
.buy .row{display:flex; gap:14px; justify-content:center; flex-wrap:wrap; margin-top:20px}
#paypal-box{max-width:340px; margin:14px auto 0}
.unlock{margin-top:24px; padding-top:22px; border-top:1px dashed var(--line)}
.unlock input{padding:12px 14px; border:1.5px solid var(--line); border-radius:10px; font-size:15px; width:280px; max-width:70%}
.unlock .msg{margin-top:10px; font-size:14px; min-height:20px}
.msg.ok{color:#2e7d32} .msg.err{color:#c0392b}

.section{padding:40px 0}
.section h2{font-size:26px; font-weight:800; margin-bottom:10px}
.muted{color:var(--muted)}
.feat{display:grid; grid-template-columns:1fr 1fr; gap:14px; margin-top:18px}
.feat .c{background:#fff; border:1px solid var(--line); border-radius:14px; padding:18px}
.feat .c b{color:var(--brand-dark)}
footer{border-top:1px solid var(--line); padding:36px 0; color:var(--muted); font-size:14px; text-align:center; margin-top:30px}

/* reader */
.reader{display:grid; grid-template-columns:300px 1fr; min-height:100vh}
.toc{position:sticky; top:0; align-self:start; height:100vh; overflow:auto; background:#fff;
  border-right:1px solid var(--line); padding:18px}
.toc h3{font-size:14px; color:var(--muted); margin:16px 0 6px; letter-spacing:.5px}
.toc a{display:block; padding:8px 10px; border-radius:8px; text-decoration:none; font-size:14px; color:var(--ink)}
.toc a:hover{background:var(--cream)}
.toc a.locked{color:var(--muted)}
.toc a.locked::after{content:" 🔒"; font-size:12px}
.toc a.active{background:var(--brand); color:#fff}
.content{padding:10px 0 80px}
.lockbar{background:var(--cream); border:1px solid var(--line); border-radius:16px; padding:28px;
  text-align:center; margin:30px auto; max-width:680px}
.lockbar .big{font-size:22px; font-weight:800; margin-bottom:8px}
.banner{background:#FCF5E2; border-bottom:1px solid #E0C98A; color:#8a6d1a; font-size:14px; padding:10px 18px; text-align:center}
.rtop{display:flex; align-items:center; gap:12px; padding:12px 20px; border-bottom:1px solid var(--line); position:sticky; top:0; background:#fff; z-index:30}
.menu-btn{display:none; border:1px solid var(--line); background:#fff; border-radius:8px; padding:6px 10px; cursor:pointer}

@media (max-width:860px){
  .hero{grid-template-columns:1fr; text-align:center} .hero .cover{margin-top:20px}
  .hero h1{font-size:32px} .feat{grid-template-columns:1fr}
  .reader{grid-template-columns:1fr}
  .toc{position:fixed; left:0; top:0; bottom:0; width:280px; z-index:50; transform:translateX(-100%); transition:.2s}
  .toc.open{transform:none}
  .menu-btn{display:inline-block}
}