/* Layout: 왼쪽 목차(데스크톱) / 상단 칩(모바일) + 입력 패널과 결과지. 포인트 컬러는 선명한 파랑 하나만 써요. */
:root{
  --bg:#F3F5F8; --surface:#FFFFFF; --sunk:#F3F5F8; --ink:#161B24; --muted:#6B7482;
  --line:#E2E6EC; --accent:#1B64F2; --accent-ink:#FFFFFF; --accent-soft:#EAF1FF;
  --minus:#4A5260; --warn:#9A5B00; --warn-soft:#FFF5E3; --paper:#FFFFFF;
  --f-display:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --f-body:var(--f-display);
  --f-num:var(--f-display);
  --r:14px;
  --shadow:0 1px 2px rgba(22,27,36,.04),0 4px 16px rgba(22,27,36,.04);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0E1116; --surface:#171B22; --sunk:#1E232C; --ink:#EEF1F5; --muted:#9AA3B0;
    --line:#2A303A; --accent:#4D8BFF; --accent-ink:#FFFFFF; --accent-soft:#17264A;
    --minus:#C3CAD4; --warn:#F2B85B; --warn-soft:#2B2413; --paper:#171B22; --shadow:none; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0E1116; --surface:#171B22; --sunk:#1E232C; --ink:#EEF1F5; --muted:#9AA3B0;
  --line:#2A303A; --accent:#4D8BFF; --accent-ink:#FFFFFF; --accent-soft:#17264A;
  --minus:#C3CAD4; --warn:#F2B85B; --warn-soft:#2B2413; --paper:#171B22; --shadow:none; color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0}
img{max-width:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;padding-inline:16px;padding-block:0 48px}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.top{max-width:1180px;margin:0 auto;display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-block:22px 18px;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:baseline;gap:10px;text-decoration:none;color:inherit}
.brand b{font-family:var(--f-display);font-weight:700;font-size:26px;letter-spacing:-.02em}
.brand span{color:var(--muted);font-size:13px}
.stamp{font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:3px 10px;background:var(--surface)}

.shell{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:minmax(0,1fr);gap:20px;padding-block:20px 0}
@media (min-width:920px){.shell{grid-template-columns:210px minmax(0,1fr);gap:36px}}

/* 목차 */
.nav{min-width:0}
.nav-scroll{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;margin-inline:-16px;padding-inline:16px}
.nav-scroll::-webkit-scrollbar{display:none}
.nav h4{display:none}
.nav a{flex:none;text-decoration:none;color:var(--ink);font-size:14px;padding:7px 13px;border-radius:999px;border:1px solid var(--line);background:var(--surface);white-space:nowrap}
.nav a[aria-current="page"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
@media (min-width:920px){
  .nav{position:sticky;top:calc(env(safe-area-inset-top,0px) + 16px);align-self:start}
  .nav-scroll{flex-direction:column;overflow:visible;margin:0;padding:0;gap:2px}
  .nav h4{display:block;margin:18px 0 6px;font-size:11px;letter-spacing:.12em;color:var(--muted);font-weight:600}
  .nav h4:first-child{margin-top:0}
  .nav a{border:0;background:none;border-radius:8px;padding:7px 10px;display:flex;justify-content:space-between}
  .nav a:hover{background:var(--sunk)}
  .nav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent);font-weight:600}
}

/* 계산기 본문 */
.calc-head{margin-bottom:18px}
.calc-head h1{font-family:var(--f-display);font-weight:700;font-size:clamp(24px,3.2vw,32px);letter-spacing:-.02em;margin:0 0 4px;text-wrap:balance}
.calc-head p{margin:0;color:var(--muted);max-width:60ch}
.calc-body{display:grid;grid-template-columns:1fr;gap:18px;align-items:start}
@media (min-width:760px){.calc-body{grid-template-columns:minmax(0,1fr) minmax(0,1.05fr)}}

.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px;display:flex;flex-direction:column;gap:18px;min-width:0}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field>label,.field>.lbl{font-size:13px;font-weight:600;color:var(--ink)}
.field .sub{font-weight:400;color:var(--muted)}
.box{display:flex;align-items:center;border:1px solid var(--line);border-radius:8px;background:var(--sunk);transition:border-color .15s}
.box:focus-within{border-color:var(--accent);background:var(--surface)}
.box input,.box select{flex:1;min-width:0;border:0;background:transparent;padding:11px 12px;font-family:var(--f-num);font-size:17px;font-weight:500;outline:none;font-variant-numeric:tabular-nums}
.box select{font-family:var(--f-body);font-size:15px;appearance:none;cursor:pointer}
.box input[type="date"]{font-size:16px}
.box .unit{padding-right:12px;color:var(--muted);font-size:14px;white-space:nowrap}
.hint{font-size:12.5px;color:var(--muted);min-height:1.2em;margin:0}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:4px 11px;font-size:13px;cursor:pointer}
.chip:hover{border-color:var(--accent);color:var(--accent)}

.seg{display:flex;background:var(--sunk);border:1px solid var(--line);border-radius:8px;padding:3px;gap:3px}
.seg label{flex:1;position:relative;cursor:pointer}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg span{display:block;text-align:center;padding:7px 6px;border-radius:6px;font-size:14px;color:var(--muted)}
.seg input:checked+span{background:var(--surface);color:var(--ink);font-weight:600;box-shadow:0 1px 2px rgba(0,0,0,.08)}
.seg input:focus-visible+span{outline:2px solid var(--accent)}

.stepper{display:flex;align-items:center;gap:0;border:1px solid var(--line);border-radius:8px;background:var(--sunk);width:max-content}
.stepper button{border:0;background:none;width:40px;height:42px;font-size:18px;cursor:pointer;color:var(--muted)}
.stepper button:hover{color:var(--accent)}
.stepper output{min-width:48px;text-align:center;font-family:var(--f-num);font-weight:600;font-size:16px}

/* 명세서 결과지 */
.slip{background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:22px 22px 18px;min-width:0;position:relative}
.slip-top{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:12px;color:var(--muted);letter-spacing:.06em;padding-bottom:12px;border-bottom:1px dashed var(--line)}
.copy{border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:3px 9px;font-size:12px;cursor:pointer;letter-spacing:0;color:var(--ink)}
.copy:hover{border-color:var(--accent);color:var(--accent)}
.hero{padding-block:18px 16px}
.hero .cap{font-size:13px;color:var(--muted);margin:0 0 2px}
.hero .big{font-family:var(--f-num);font-weight:600;font-size:clamp(30px,5.2vw,42px);letter-spacing:-.03em;line-height:1.15;font-variant-numeric:tabular-nums;word-break:keep-all}
.hero .big small{font-family:var(--f-body);font-size:.45em;font-weight:500;margin-left:4px;letter-spacing:0;color:var(--muted)}
.hero .aux{margin:6px 0 0;font-size:14px;color:var(--muted)}
.hero .aux strong{color:var(--ink);font-weight:600}

.bar{display:flex;height:10px;border-radius:5px;overflow:hidden;background:var(--line);margin:4px 0 16px}
.bar i{display:block;height:100%}
.bar .a{background:var(--accent)}
.bar .b{background:var(--minus);opacity:.75}
.legend{display:flex;gap:14px;font-size:12px;color:var(--muted);margin:-8px 0 14px;flex-wrap:wrap}
.legend span::before{content:"";display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:5px;vertical-align:1px;background:var(--c)}

.lines{display:flex;flex-direction:column}
.gh{font-size:11.5px;letter-spacing:.1em;color:var(--muted);font-weight:600;padding:12px 0 4px}
.ln{display:flex;align-items:baseline;gap:8px;padding:5px 0;font-size:14px}
.ln .k{white-space:nowrap}
.ln .k em{font-style:normal;color:var(--muted);font-size:12px;margin-left:4px}
.ln .dots{flex:1;border-bottom:1px dotted var(--line);transform:translateY(-4px);min-width:12px}
.ln .v{font-family:var(--f-num);font-variant-numeric:tabular-nums;font-weight:500;white-space:nowrap}
.ln.minus .v{color:var(--minus)}
.ln.sum{border-top:1px solid var(--ink);margin-top:6px;padding-top:9px;font-weight:600}
.ln.sum .v{font-weight:600}

.note{margin:14px 0 0;padding:10px 12px;border-radius:8px;background:var(--warn-soft);color:var(--warn);font-size:13px}
.fine{margin:14px 0 0;font-size:12px;color:var(--muted);line-height:1.6}

.chart{width:100%;height:auto;display:block;margin-top:6px}
.chart text{fill:var(--muted);font-family:var(--f-num);font-size:17px}

.toast{position:fixed;left:50%;bottom:calc(env(safe-area-inset-bottom,0px) + 24px);transform:translate(-50%,20px);background:var(--ink);color:var(--bg);padding:9px 16px;border-radius:999px;font-size:13px;opacity:0;transition:.2s;pointer-events:none}
.toast.on{opacity:1;transform:translate(-50%,0)}

.foot{max-width:1180px;margin:40px auto 0;padding-top:18px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted);line-height:1.7}
.foot b{color:var(--ink);font-weight:600}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* ===== 사이트 공통 추가 ===== */
.nav-scroll{position:relative}
.top nav.links{display:flex;gap:14px;font-size:13px}
.top nav.links a{color:var(--muted);text-decoration:none}
.top nav.links a:hover{color:var(--accent)}
.brand b a,.brand{color:inherit}

/* 본문 설명 */
.doc{min-width:0;max-width:720px;margin-top:40px;display:flex;flex-direction:column;gap:36px}
.doc h2{font-family:var(--f-display);font-weight:700;font-size:21px;letter-spacing:-.01em;margin:0 0 10px;text-wrap:balance}
.doc p{margin:0 0 10px;max-width:65ch}
.doc ul,.doc ol{margin:0 0 10px;padding-left:20px}
.doc li{margin:3px 0}
.doc code{font-family:var(--f-num);font-size:13.5px;background:var(--sunk);border:1px solid var(--line);border-radius:5px;padding:1px 6px}
.formula{font-family:var(--f-num);font-size:14px;background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:6px;padding:10px 14px;margin:6px 0 12px;overflow-x:auto;white-space:nowrap}
.tbl{overflow-x:auto;margin:6px 0 12px}
.tbl table{border-collapse:collapse;font-size:14px;min-width:100%}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:8px 10px;text-align:left;white-space:nowrap}
.tbl th{font-size:12.5px;color:var(--muted);font-weight:600}
.tbl td.n{font-family:var(--f-num);text-align:right;font-variant-numeric:tabular-nums}
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{cursor:pointer;padding:10px 0;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--muted);font-weight:400;font-size:18px;line-height:1}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--ink);margin:0 0 12px}
.related{display:grid;grid-template-columns:1fr;gap:10px}
@media (min-width:560px){.related{grid-template-columns:1fr 1fr}}
.related a,.tile{display:flex;flex-direction:column;gap:2px;text-decoration:none;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;transition:border-color .15s}
.related a:hover,.tile:hover{border-color:var(--accent)}
.related a b,.tile b{font-weight:600}
.related a span,.tile span{font-size:13px;color:var(--muted)}
.updated{font-size:12.5px;color:var(--muted)}

/* 홈 */
.home-hero{padding-block:8px 26px}
.home-hero h1{font-family:var(--f-display);font-weight:700;font-size:clamp(28px,4.4vw,42px);letter-spacing:-.025em;line-height:1.2;margin:0 0 10px;text-wrap:balance}
.home-hero p{margin:0;color:var(--muted);max-width:52ch}
.group{margin-bottom:28px}
.group h2{font-size:12px;letter-spacing:.12em;color:var(--muted);font-weight:600;margin:0 0 10px}
.tiles{display:grid;grid-template-columns:1fr;gap:10px}
@media (min-width:600px){.tiles{grid-template-columns:1fr 1fr}}
.tile .fig{font-family:var(--f-num);font-size:12.5px;color:var(--accent);margin-top:6px}

/* 안내 페이지 */
.legal{max-width:720px}
.legal h1{font-family:var(--f-display);font-weight:700;font-size:clamp(24px,3.2vw,32px);letter-spacing:-.02em;margin:0 0 6px}
.legal h2{font-size:17px;margin:28px 0 8px}
.legal p,.legal li{max-width:65ch}
.legal a{color:var(--accent)}

.foot-links{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:10px}
.foot-links a{color:var(--ink);text-decoration:none;font-weight:500}
.foot-links a:hover{color:var(--accent)}
.ad{margin:28px 0;min-height:0}

main,.doc>section{min-width:0}

.row3{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) minmax(0,1fr);gap:8px}
.check{display:inline-flex;align-items:center;gap:8px;font-size:14px;cursor:pointer;width:max-content}
.check input{width:18px;height:18px;accent-color:var(--accent);margin:0}
.tbl td.n{text-align:left}
.doc p+h2,.doc .tbl+h2,.doc .formula+h2,.doc ul+h2{margin-top:26px}

/* ===== 2차 디자인: 대중적인 서체, 한 가지 포인트 컬러, 모바일 가독성 ===== */
body{font-size:16px;line-height:1.6;letter-spacing:-.01em;font-feature-settings:"tnum"}
.brand b{font-weight:800;font-size:24px;letter-spacing:-.04em;color:var(--accent)}
.brand span{font-size:13px}
.stamp{background:var(--accent-soft);color:var(--accent);border-color:transparent;font-weight:600}
.calc-head h1,.home-hero h1,.legal h1,.doc h2{font-weight:800;letter-spacing:-.035em}
.calc-head p{font-size:15.5px}
.panel,.slip,.related a,.tile{border-color:var(--line);box-shadow:var(--shadow)}
.panel{border-radius:var(--r);padding:22px}
.slip{border-radius:var(--r)}
.field>label,.field>.lbl{font-size:14px;font-weight:700}
.box{border-radius:10px;min-height:52px}
.box input,.box select{font-size:18px;font-weight:600;padding:13px 14px}
.box select{font-size:16px;font-weight:500}
.box:focus-within{box-shadow:0 0 0 3px var(--accent-soft)}
.chip{padding:6px 12px;font-size:13.5px;font-weight:500;background:var(--sunk);border-color:transparent}
.chip:hover{background:var(--accent-soft);color:var(--accent);border-color:transparent}
.seg{border-radius:10px;padding:4px}
.seg span{padding:9px 6px;font-size:15px;border-radius:8px}
.seg input:checked+span{background:var(--accent);color:var(--accent-ink);box-shadow:none}
.stepper{border-radius:10px}
.stepper button{width:46px;height:48px;font-size:20px}
.stepper output{font-weight:700;font-size:17px}
.hero .cap{font-size:14px;font-weight:600}
.hero .big{font-weight:800;letter-spacing:-.04em;color:var(--accent);font-size:clamp(34px,6vw,46px)}
.hero .big small{font-weight:600;color:var(--muted)}
.hero .aux strong{font-weight:700}
.slip-top{letter-spacing:0;font-weight:600}
.copy{font-weight:600;border-radius:8px;padding:5px 10px}
.bar{height:12px;border-radius:6px}
.bar .b{background:var(--line);opacity:1}
.ln{font-size:15px;padding:6px 0}
.ln .v{font-weight:600}
.ln.sum{border-top:1.5px solid var(--ink)}
.ln.sum .v{font-weight:800}
.gh{letter-spacing:.02em;font-weight:700}
.nav a[aria-current="page"]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.nav a{font-weight:500}
@media (min-width:920px){.nav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent);font-weight:700}}
.formula{font-size:14.5px;font-weight:500;border-left-width:4px}
.tile .fig{font-weight:700}
.related a b,.tile b{font-weight:700;font-size:16px}
.related a:hover,.tile:hover{border-color:var(--accent)}
.faq summary{font-size:16px}
.note{font-weight:500}

/* 모바일 */
@media (max-width:759px){
  body{padding-inline:14px}
  .top{padding-block:14px 12px}
  .brand span{display:none}
  .shell{padding-block:12px 0;gap:14px}
  .calc-head{margin-bottom:14px}
  .calc-head p{font-size:15px}
  .panel{padding:18px 16px;gap:16px}
  .slip{padding:18px 16px 16px}
  .hero{padding-block:14px 12px}
  .ln .k em{display:block;margin-left:0;line-height:1.3}
  .ln{align-items:center}
  .ln .dots{transform:none;align-self:center}
  .doc{margin-top:32px;gap:30px}
  .foot{margin-bottom:64px}
}

/* 모바일 하단 결과 바: 결과지가 화면 밖에 있을 때만 보여요 */
.msum{position:fixed;left:12px;right:12px;bottom:calc(env(safe-area-inset-bottom,0px) + 12px);z-index:20;display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--accent);color:var(--accent-ink);border:0;border-radius:14px;padding:12px 16px;box-shadow:0 8px 24px rgba(27,100,242,.3);font:inherit;cursor:pointer;text-align:left;transform:translateY(0);transition:transform .2s,opacity .2s}
.msum[data-off]{transform:translateY(140%);opacity:0;pointer-events:none}
.msum span{font-size:13px;opacity:.9}
.msum b{font-size:19px;font-weight:800;letter-spacing:-.03em;white-space:nowrap}
.msum b small{font-size:.7em;font-weight:600;margin-left:3px}
@media (min-width:760px){.msum{display:none}}