:root{
  --ink:#173f35;--ink-2:#3d5a52;--muted:#66807a;--line:#dfe9e4;--bg:#fbfcf8;--panel:#f2f8f4;
  --brand:#0e8a6c;--brand-d:#0b6f57;--accent:#e88354;--warn:#fff6e8;--warn-line:#f1d3a8;
  --radius:14px;--w:1080px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.75 "Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;letter-spacing:-.01em;word-break:keep-all;overflow-wrap:anywhere}
a{color:var(--brand-d)}
img{max-width:100%;height:auto}
.wrap{width:min(var(--w),calc(100% - 32px));margin:0 auto}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:8px;background:#fff;padding:8px 12px;z-index:9}

/* header */
.top{position:sticky;top:0;z-index:5;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;gap:20px;min-height:64px}
.brand{display:flex;align-items:center;gap:9px;color:var(--ink);text-decoration:none;font-weight:800;font-size:18px;white-space:nowrap}
.brand b{color:var(--brand)}
.brand-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--brand);color:#fff;font-size:15px;font-weight:900}
.gnb{display:flex;gap:4px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.gnb::-webkit-scrollbar{display:none}
.gnb a{padding:8px 11px;border-radius:9px;color:var(--ink-2);text-decoration:none;font-size:15px;font-weight:650;white-space:nowrap}
.gnb a:hover,.gnb a[aria-current]{background:var(--panel);color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:50px;padding:0 24px;border-radius:12px;background:var(--brand);color:#fff;font-weight:800;text-decoration:none;border:0;cursor:pointer;font-size:16px}
.btn:hover{background:var(--brand-d)}
.btn-sm{min-height:40px;padding:0 16px;font-size:14px;border-radius:10px}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{background:var(--panel)}

/* doc */
main{padding:20px 0 64px}
.crumbs{font-size:14px;color:var(--muted);margin:4px 0 18px}
.crumbs a{color:var(--muted);text-decoration:none}
.doc{max-width:780px;margin:0 auto}
.t-home .doc,.t-hub .doc{max-width:var(--w)}
.doc-head{padding:18px 0 10px}
.kicker{margin:0 0 10px;color:var(--brand);font-weight:800;font-size:15px}
h1{margin:0;font-size:clamp(30px,5vw,44px);line-height:1.25;letter-spacing:-.04em;font-weight:900}
.lead{margin:16px 0 0;font-size:19px;color:var(--ink-2)}
.meta{margin:14px 0 0;font-size:14px;color:var(--muted)}
.toc{margin:26px 0;padding:18px 22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.toc p{margin:0 0 6px;font-weight:800;font-size:15px}
.toc ol{margin:0;padding-left:20px;font-size:15px}
.toc a{color:var(--ink-2);text-decoration:none}
.body h2{margin:52px 0 14px;font-size:clamp(23px,3.4vw,28px);line-height:1.35;letter-spacing:-.03em;scroll-margin-top:80px}
.body h3{margin:30px 0 8px;font-size:20px;letter-spacing:-.02em}
.body p{margin:0 0 16px}
.body ul,.body ol{padding-left:22px;margin:0 0 18px}
.body li{margin:4px 0}
.body strong{color:var(--ink)}
.box{margin:22px 0;padding:18px 20px;border-radius:var(--radius);background:var(--panel);border:1px solid var(--line)}
.box p:last-child,.box ul:last-child{margin-bottom:0}
.box.warn{background:var(--warn);border-color:var(--warn-line)}
.box-t{display:block;margin-bottom:6px;font-weight:800}
.steps{list-style:none;padding:0!important;counter-reset:st}
.steps>li{position:relative;padding:4px 0 14px 52px;counter-increment:st}
.steps>li:before{content:counter(st);position:absolute;left:0;top:2px;width:36px;height:36px;border-radius:50%;background:var(--brand);color:#fff;font-weight:900;display:grid;place-items:center}
.steps>li strong{display:block;font-size:18px}
.tbl{width:100%;overflow-x:auto;margin:18px 0 22px;-webkit-overflow-scrolling:touch}
table{width:100%;border-collapse:collapse;font-size:15px;background:#fff;min-width:520px}
th,td{padding:11px 12px;border:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--panel);font-weight:800}

/* cta */
.cta{margin:56px 0 8px;padding:30px 28px;border-radius:20px;background:linear-gradient(135deg,#0f6b55,#173f35);color:#fff}
.cta-kicker{margin:0;color:#bfeedd;font-weight:800;font-size:15px}
.cta-title{margin:8px 0 10px;font-size:clamp(22px,3.6vw,30px);line-height:1.35;letter-spacing:-.03em}
.cta-sub{margin:0 0 14px;color:#dcefe8;font-size:16px}
.cta-points{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:0 0 20px}
.cta-points li{padding:4px 12px;border-radius:99px;background:rgba(255,255,255,.12);font-size:14px;font-weight:700}
.cta .btn{background:#fff;color:var(--ink);margin:0 8px 8px 0}
.cta .btn:hover{background:#eaf6f1}
.cta .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}

/* faq / sources / related */
.faq,.sources,.related{margin-top:48px}
.faq h2,.sources h2,.related h2{font-size:24px;letter-spacing:-.03em;margin:0 0 14px}
.faq details{border:1px solid var(--line);border-radius:12px;background:#fff;margin:0 0 10px}
.faq summary{cursor:pointer;padding:16px 18px;font-weight:800;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary:before{content:"Q. ";color:var(--brand)}
.faq-a{padding:0 18px 16px;color:var(--ink-2)}
.faq-a p{margin:0 0 10px}
.sources ul{font-size:14px;padding-left:20px}
.note{font-size:14px;color:var(--muted)}
.cards{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.cards a{display:block;height:100%;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;color:var(--ink);text-decoration:none}
.cards a:hover{border-color:var(--brand)}
.cards strong{display:block;font-size:17px;line-height:1.4;margin-bottom:6px}
.cards span{display:block;font-size:14px;color:var(--muted);line-height:1.6}

/* home / hub */
.hero{padding:34px 0 8px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.section-t{margin:48px 0 14px;font-size:26px;letter-spacing:-.03em}

/* calculator */
.calc{margin:24px 0;padding:24px;border-radius:18px;background:#fff;border:1px solid var(--line);box-shadow:0 8px 28px rgba(23,63,53,.06)}
.calc fieldset{border:0;padding:0;margin:0 0 6px}
.calc legend{font-weight:900;font-size:18px;margin-bottom:10px}
.fld{display:grid;gap:6px;margin:0 0 14px}
.fld label{font-weight:750;font-size:15px}
.fld small{color:var(--muted);font-size:13px}
.fld input,.fld select{width:100%;min-height:50px;padding:0 14px;border:1px solid #c9d8d1;border-radius:11px;font:inherit;font-size:18px;background:#fff;color:var(--ink)}
.fld input:focus,.fld select:focus{outline:3px solid rgba(14,138,108,.25);border-color:var(--brand)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.result{margin-top:16px;padding:18px;border-radius:14px;background:var(--panel)}
.result dl{display:grid;grid-template-columns:auto 1fr;gap:8px 16px;margin:0}
.result dt{color:var(--ink-2);font-size:15px}
.result dd{margin:0;text-align:right;font-weight:850;font-size:18px;font-variant-numeric:tabular-nums}
.result .big{font-size:24px;color:var(--brand-d)}
.result .bad{color:#b4462a}
.calc-err{color:#b4462a;font-weight:700;font-size:15px;min-height:1em}

/* footer */
.foot{border-top:1px solid var(--line);background:#fff;padding:30px 0 40px;font-size:14px;color:var(--muted)}
.foot-brand{color:var(--ink-2)}
.foot-links{display:flex;flex-wrap:wrap;gap:6px 16px;margin:10px 0}
.foot-links a{color:var(--ink-2);text-decoration:none}
.biz{margin:6px 0;line-height:1.6}

@media (max-width:760px){
  body{font-size:16px}
  .top-in{gap:10px;min-height:56px}
  .gnb{display:none}
  .top .btn-sm{margin-left:auto}
  .lead{font-size:17px}
  .grid-2,.row2{grid-template-columns:1fr}
  .cta{padding:24px 20px}
  .calc{padding:18px}
}
.fld .choice{display:flex;align-items:center;gap:10px;min-height:50px;padding:0 14px;border:1px solid #c9d8d1;border-radius:11px;background:#fff;font-weight:650;font-size:15px;cursor:pointer}
.fld .choice input{width:18px;min-height:0;height:18px;margin:0;padding:0;accent-color:var(--brand)}
.fld .choice:has(input:checked){border-color:var(--brand);background:#eef8f3}
.result hr{border:0;border-top:1px solid var(--line);margin:16px 0}