:root{
  --paper:#f4f1e9; --paper-2:#ece7da; --ink:#1d2a24; --ink-soft:#4a574f;
  --green:#16513b; --green-bright:#1f7a55; --amber:#c98a2b; --amber-soft:#e3b873;
  --line:#d8d2c2; --card:#fbfaf5; --shadow:0 1px 2px rgba(29,42,36,.06),0 8px 24px rgba(29,42,36,.07);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Pretendard',sans-serif;color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(31,122,85,.10),transparent 60%),radial-gradient(900px 500px at -10% 10%,rgba(201,138,43,.08),transparent 55%),var(--paper);}
.wrap{max-width:780px;margin:0 auto;padding:34px 20px 60px}
a{color:inherit;text-decoration:none}

/* header */
header.site{margin-bottom:18px}
.eyebrow{display:inline-block;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--green-bright);font-weight:700;
  border:1px solid rgba(31,122,85,.3);border-radius:999px;padding:5px 12px;margin-bottom:14px;background:rgba(31,122,85,.06)}
h1.title{font-family:'Gowun Batang',serif;font-size:clamp(27px,5.6vw,40px);line-height:1.15;font-weight:700;letter-spacing:-.01em}
h1.title .accent{color:var(--green);position:relative}
h1.title .accent::after{content:"";position:absolute;left:0;right:0;bottom:3px;height:8px;background:var(--amber-soft);opacity:.45;z-index:-1;border-radius:2px}
.site-lede{margin-top:10px;color:var(--ink-soft);font-size:15px;max-width:58ch}

/* nav */
nav.tabs{position:sticky;top:0;z-index:20;display:flex;gap:6px;overflow-x:auto;padding:12px 20px;margin:18px -20px 24px;
  background:linear-gradient(var(--paper) 70%,rgba(244,241,233,0));scrollbar-width:thin}
nav.tabs::-webkit-scrollbar{height:5px} nav.tabs::-webkit-scrollbar-thumb{background:var(--line);border-radius:9px}
nav.tabs a{white-space:nowrap;border:1px solid var(--line);background:var(--card);color:var(--ink-soft);
  font-size:13.5px;font-weight:600;padding:9px 15px;border-radius:999px;cursor:pointer;transition:all .2s ease}
nav.tabs a:hover{border-color:var(--green-bright);color:var(--green)}
nav.tabs a.active{background:var(--green);color:#fff;border-color:var(--green);box-shadow:0 5px 14px rgba(22,81,59,.25)}

/* calc head */
.calc-head{margin-bottom:18px}
.calc-head h2{font-family:'Gowun Batang',serif;font-size:clamp(22px,4.4vw,30px);font-weight:700;line-height:1.2}
.calc-head p{margin-top:7px;color:var(--ink-soft);font-size:14.5px;max-width:58ch}

/* panels & controls */
.panel{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow);margin-bottom:18px}
.panel h3{font-family:'Gowun Batang',serif;font-size:17px;font-weight:700;margin-bottom:16px;display:flex;align-items:center;gap:9px}
.panel h3 .dot{width:8px;height:8px;border-radius:50%;background:var(--amber);display:inline-block}

.seg{display:grid;gap:8px;background:var(--paper-2);border-radius:13px;padding:6px}
.seg.c2{grid-template-columns:1fr 1fr}.seg.c3{grid-template-columns:1fr 1fr 1fr}
.seg.c5{grid-template-columns:repeat(5,1fr)}
.seg button{border:none;background:transparent;cursor:pointer;padding:12px 6px;border-radius:9px;font-family:inherit;font-size:14px;font-weight:700;color:var(--ink-soft);transition:all .22s ease;text-align:center}
.seg button .sub{display:block;font-size:10.5px;font-weight:500;opacity:.75;margin-top:2px;line-height:1.3}
.seg button.active{background:var(--green);color:#fff;box-shadow:0 6px 16px rgba(22,81,59,.28)}
.seg button.active .sub{opacity:.85}
.seg.c5 button{font-size:12.5px;padding:11px 2px}

.field{margin-top:20px}.field:first-of-type{margin-top:0}
.field-top{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:9px;gap:10px}
.field-top label{font-size:14px;font-weight:600;color:var(--ink-soft)}
.field-val{font-family:'Gowun Batang',serif;font-weight:700;font-size:20px;color:var(--green);white-space:nowrap}
.field-val small{font-size:12.5px;color:var(--ink-soft);font-family:'Pretendard';font-weight:600}

input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:999px;outline:none;cursor:pointer;
  background:linear-gradient(to right,var(--green-bright) var(--fill,50%),var(--paper-2) var(--fill,50%))}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:25px;height:25px;border-radius:50%;background:var(--card);border:3px solid var(--green);cursor:pointer;box-shadow:0 3px 9px rgba(22,81,59,.3);transition:transform .15s}
input[type=range]::-webkit-slider-thumb:active{transform:scale(1.12)}
input[type=range]::-moz-range-thumb{width:25px;height:25px;border-radius:50%;background:var(--card);border:3px solid var(--green);cursor:pointer}
.ticks{display:flex;justify-content:space-between;margin-top:6px;font-size:11px;color:var(--ink-soft)}

.numrow{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.numfield label{display:block;font-size:13px;font-weight:600;color:var(--ink-soft);margin-bottom:7px}
.numfield .inwrap{position:relative}
.numfield input{width:100%;border:1px solid var(--line);background:var(--paper);border-radius:11px;padding:12px 40px 12px 14px;font-family:inherit;font-size:16px;font-weight:600;color:var(--ink);outline:none}
.numfield input:focus{border-color:var(--green-bright);box-shadow:0 0 0 3px rgba(31,122,85,.12)}
.numfield .suffix{position:absolute;right:13px;top:50%;transform:translateY(-50%);font-size:13px;color:var(--ink-soft);font-weight:600}

.note-inline{margin-top:13px;font-size:12.5px;color:var(--ink-soft);background:rgba(201,138,43,.08);border-left:3px solid var(--amber);padding:9px 12px;border-radius:0 8px 8px 0}

/* result */
.result{background:linear-gradient(150deg,var(--green) 0%,#0f3a2a 100%);color:#f2f5f1;position:relative;overflow:hidden}
.result::before{content:"";position:absolute;right:-60px;top:-60px;width:200px;height:200px;background:radial-gradient(circle,rgba(227,184,115,.35),transparent 70%)}
.result h3{color:#fff}.result h3 .dot{background:var(--amber-soft)}
.result-label{font-size:13px;color:rgba(242,245,241,.7);letter-spacing:.03em}
.hero-num{font-family:'Gowun Batang',serif;font-weight:700;line-height:1;font-size:clamp(38px,9vw,58px);margin:6px 0 4px;letter-spacing:-.01em}
.hero-num .unit{font-size:.42em;color:var(--amber-soft);margin-left:4px}
.hero-won{font-size:13.5px;color:rgba(242,245,241,.65);font-variant-numeric:tabular-nums}
.bar{display:flex;height:13px;border-radius:8px;overflow:hidden;margin:20px 0 11px;background:rgba(255,255,255,.12)}
.bar span{height:100%;transition:width .5s cubic-bezier(.4,0,.2,1)}
.legend{display:flex;flex-wrap:wrap;gap:14px;margin-top:4px}
.legend div{display:flex;align-items:center;gap:6px;font-size:12.5px;color:rgba(242,245,241,.85)}
.legend .sw{width:11px;height:11px;border-radius:3px}

.breakdown{display:grid;grid-template-columns:1fr 1fr;gap:11px}
.bd-card{background:var(--card);border:1px solid var(--line);border-radius:13px;padding:14px 15px}
.bd-card .k{font-size:12px;color:var(--ink-soft);font-weight:600}
.bd-card .v{font-family:'Gowun Batang',serif;font-weight:700;font-size:20px;margin-top:5px;color:var(--ink)}
.bd-card .v small{font-size:12.5px;color:var(--ink-soft);font-family:'Pretendard'}
.bd-card.hl{border-color:rgba(31,122,85,.4);background:rgba(31,122,85,.05)}.bd-card.hl .v{color:var(--green)}
.savings{margin-top:14px;font-size:13px;color:var(--ink-soft);text-align:center}
.savings strong{color:var(--amber);font-weight:700}

/* index cards */
.cardgrid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:6px}
.ccard{display:block;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow);transition:transform .18s ease,border-color .18s ease}
.ccard:hover{transform:translateY(-3px);border-color:var(--green-bright)}
.ccard .tag{font-size:11px;font-weight:700;letter-spacing:.04em;color:var(--green-bright);text-transform:uppercase}
.ccard h3{font-family:'Gowun Batang',serif;font-size:19px;font-weight:700;margin:8px 0 6px}
.ccard p{font-size:13px;color:var(--ink-soft)}
.ccard .go{margin-top:12px;font-size:13px;font-weight:700;color:var(--green)}

/* legal */
.disclaimer{font-size:11.5px;color:var(--ink-soft);line-height:1.6;margin-top:6px;border-top:1px dashed var(--line);padding-top:16px}
.disclaimer b{color:var(--ink)}
footer.foot{text-align:center;margin-top:26px;font-size:12px;color:var(--ink-soft)}
@media(max-width:520px){.breakdown,.numrow,.cardgrid{grid-template-columns:1fr}.wrap{padding:26px 16px 46px}.seg.c5{grid-template-columns:1fr 1fr 1fr}}

/* share bar */
.sharebar .share-btns{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sharebar button{border:none;cursor:pointer;font-family:inherit;font-weight:700;font-size:14px;padding:13px;border-radius:11px;transition:all .18s ease}
.sharebar #shareState{background:var(--green);color:#fff;box-shadow:0 5px 14px rgba(22,81,59,.22)}
.sharebar #shareState:hover{background:var(--green-bright)}
.sharebar #shareClean{background:var(--paper-2);color:var(--ink);border:1px solid var(--line)}
.sharebar #shareClean:hover{border-color:var(--green-bright);color:var(--green)}
.share-hint{margin-top:12px;font-size:12.5px;color:var(--ink-soft);line-height:1.55}
.share-url{width:100%;border:1px solid var(--green-bright);background:var(--paper);border-radius:9px;padding:10px 12px;font-size:12.5px;color:var(--ink);font-family:'Pretendard';outline:none}
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#f4f1e9;padding:11px 20px;border-radius:999px;font-size:13.5px;font-weight:600;opacity:0;transition:all .3s ease;z-index:60;pointer-events:none;box-shadow:0 8px 24px rgba(29,42,36,.25)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media(max-width:520px){.sharebar .share-btns{grid-template-columns:1fr}}

/* footer links + content pages */
.foot-links{display:flex;justify-content:center;flex-wrap:wrap;gap:6px 16px;margin-bottom:8px}
.foot-links a{color:var(--ink-soft);font-weight:600}
.foot-links a:hover{color:var(--green)}
.foot-copy{color:var(--ink-soft)}
.prose p{font-size:14.5px;color:var(--ink-soft);margin-bottom:12px}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--ink)}
.prose ul{margin:2px 0 14px;padding-left:18px}
.prose li{font-size:14.5px;color:var(--ink-soft);margin-bottom:7px}
.prose a{color:var(--green);font-weight:600;text-decoration:underline;word-break:break-all}
.prose h4{font-size:15px;font-weight:700;color:var(--ink);margin:18px 0 8px}
.btn{display:inline-block;background:var(--green);color:#fff;font-weight:700;font-size:15px;padding:13px 24px;border-radius:11px;box-shadow:0 5px 14px rgba(22,81,59,.22);transition:all .18s ease}
.btn:hover{background:var(--green-bright)}
.kv{font-size:14.5px;color:var(--ink-soft);margin-bottom:8px}
.kv b{color:var(--ink);font-weight:700}

/* FAQ accordion */
.faq details{border:1px solid var(--line);border-radius:11px;padding:0;margin-bottom:10px;background:var(--paper);overflow:hidden}
.faq details:last-child{margin-bottom:0}
.faq summary{cursor:pointer;list-style:none;padding:14px 16px;font-size:14.5px;font-weight:700;color:var(--ink);display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:20px;font-weight:400;color:var(--green-bright);transition:transform .2s ease;line-height:1}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq .ans{padding:13px 16px 15px;font-size:14px;color:var(--ink-soft);line-height:1.65}
.faq .ans strong{color:var(--ink)}