:root{
  --bg:#F7F8FA; --ink:#171C26; --soft:#5A6573; --line:#E6E9EF; --card:#FFFFFF;
  --brand:#1B63E0; --brand-d:#1450BC; --accent:#0FB57E; --warn:#B45309;
  --radius:14px; --shadow:0 6px 24px -12px rgba(20,40,80,.18);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Pretendard','Apple SD Gothic Neo','Malgun Gothic',system-ui,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:760px;margin:0 auto;padding:0 18px}
.wide{max-width:1040px}

/* header */
.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px;color:var(--ink)}
.brand .mk{width:28px;height:28px;border-radius:8px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px}
.brand b{color:var(--brand)}
.topnav{display:flex;gap:16px;font-size:14px;font-weight:600;color:var(--soft)}
.topnav a{color:var(--soft)}
@media(max-width:620px){.topnav{display:none}}

/* hero/intro */
.hero{padding:34px 0 8px}
.hero h1{font-size:clamp(24px,5vw,34px);font-weight:800;letter-spacing:-.02em;line-height:1.3}
.hero p{color:var(--soft);margin-top:10px;font-size:16px}
.crumb{font-size:13px;color:var(--soft);padding:14px 0 0}
.crumb a{color:var(--soft)}

/* calculator card */
.calc{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin:18px 0}
.calc h2{font-size:18px;font-weight:700;margin-bottom:4px}
.calc .sub{color:var(--soft);font-size:14px;margin-bottom:16px}
.field{margin-bottom:14px}
.field label{display:block;font-size:13.5px;font-weight:600;margin-bottom:6px;color:#2b333f}
.field .inrow{display:flex;align-items:stretch}
.field input,.field select{width:100%;font-family:inherit;font-size:16px;padding:12px 13px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);outline:none;transition:.15s}
.field input:focus,.field select:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(27,99,224,.12)}
.field .suffix{display:flex;align-items:center;padding:0 12px;border:1px solid var(--line);border-left:0;border-radius:0 10px 10px 0;background:#F3F5F9;color:var(--soft);font-size:14px;white-space:nowrap}
.field .inrow input{border-radius:10px 0 0 10px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:520px){.grid2{grid-template-columns:1fr}}
.btn{display:inline-flex;align-items:center;justify-content:center;width:100%;font-family:inherit;font-weight:700;font-size:16px;
  border:none;border-radius:11px;padding:14px;cursor:pointer;background:var(--brand);color:#fff;transition:.15s;margin-top:4px}
.btn:hover{background:var(--brand-d)}

/* result */
.result{display:none;margin-top:18px;border-top:1px dashed var(--line);padding-top:18px}
.r-big{font-size:clamp(24px,6vw,32px);font-weight:800;color:var(--brand);letter-spacing:-.02em}
.r-table{width:100%;border-collapse:collapse;margin:14px 0 4px}
.r-table td{padding:9px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.r-table td:last-child{text-align:right;font-weight:700}
.r-table tr:last-child td{border-bottom:0;font-size:16px}
.r-note{font-size:12.5px;color:var(--warn);margin-top:8px;line-height:1.6}
.r-cta{margin-top:16px}
.cta-ins{display:block;background:linear-gradient(100deg,#0FB57E,#0a9d6c);color:#fff;text-align:center;font-weight:700;
  padding:14px;border-radius:11px;font-size:15.5px}
.cta-ins:hover{text-decoration:none;opacity:.94}
.r-disc{display:block;font-size:11.5px;color:var(--soft);margin-top:7px;text-align:center}

/* content blocks (SEO 두께) */
.sec{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin:16px 0}
.sec h2{font-size:19px;font-weight:700;margin-bottom:10px;letter-spacing:-.01em}
.sec h3{font-size:16px;font-weight:700;margin:16px 0 6px}
.sec p{color:#37404d;margin-bottom:10px}
.sec ul{margin:0 0 10px 18px}.sec li{margin-bottom:5px;color:#37404d}
.tbl{width:100%;border-collapse:collapse;margin:8px 0 12px;font-size:14.5px}
.tbl th,.tbl td{border:1px solid var(--line);padding:9px 11px;text-align:left}
.tbl th{background:#F3F5F9;font-weight:700}
.ex{background:#F3F8FF;border:1px solid #D6E6FF;border-radius:10px;padding:14px;margin:10px 0;font-size:14.5px}
.ex b{color:var(--brand-d)}
details.faq{border-bottom:1px solid var(--line)}
details.faq summary{cursor:pointer;list-style:none;padding:13px 0;font-weight:700;font-size:15px;display:flex;justify-content:space-between}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";color:var(--brand)}
details.faq[open] summary::after{content:"−"}
details.faq p{padding:0 0 13px;color:var(--soft);font-size:14.5px}
.disc{background:#FFF7ED;border:1px solid #FED7AA;color:#7c4a12;border-radius:10px;padding:12px 14px;font-size:13px;margin:14px 0;line-height:1.65}

/* ad slot */
.ad{margin:18px 0;min-height:90px;display:flex;align-items:center;justify-content:center;
  background:repeating-linear-gradient(45deg,#fafbfc,#fafbfc 10px,#f3f5f9 10px,#f3f5f9 20px);
  border:1px dashed var(--line);border-radius:10px;color:#aab2bf;font-size:12px}

/* embed + coupang */
.embed{background:#0E1726;color:#cdd6e3;border-radius:var(--radius);padding:20px;margin:16px 0}
.embed h2{color:#fff;font-size:17px;margin-bottom:6px}
.embed p{font-size:14px;color:#9fb0c6;margin-bottom:12px}
.embed button{background:#fff;color:#0E1726;font-weight:700;border:none;border-radius:10px;padding:11px 16px;cursor:pointer;font-family:inherit}
.embed textarea{display:none;width:100%;margin-top:12px;height:80px;border-radius:8px;border:1px solid #2a3852;background:#0a1220;color:#9fb0c6;padding:10px;font-size:12px;font-family:monospace}
.embed .msg{font-size:13px;color:#7fe3bb;margin-top:8px}
.coupang{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0}
@media(max-width:520px){.coupang{grid-template-columns:1fr}}
.coupang a{display:block;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;color:var(--ink);font-size:13.5px}
.coupang a b{display:block;font-size:14.5px;margin-bottom:3px}
.coupang a span{color:var(--soft);font-size:12px}

/* related links */
.rel{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.rel a{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 14px;font-size:13.5px;color:#2b333f}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0}
@media(max-width:560px){.cards{grid-template-columns:1fr}}
.cards a{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;color:var(--ink);box-shadow:var(--shadow);transition:.15s}
.cards a:hover{transform:translateY(-2px);text-decoration:none}
.cards a b{display:block;font-size:16.5px;font-weight:700;margin-bottom:4px}
.cards a span{color:var(--soft);font-size:13.5px}

footer{margin-top:30px;border-top:1px solid var(--line);background:#fff}
footer .wrap{padding:26px 18px;font-size:13px;color:var(--soft)}
footer a{color:var(--soft)}
footer .fbig{font-weight:800;color:var(--ink);font-size:15px;margin-bottom:8px}

/* embed page minimal */
body.embed-page{background:#fff}
body.embed-page .calc{margin:0;box-shadow:none;border:0}