:root{--ink:#0f1623;--sub:#556070;--line:#e4e8ee;--accent:#2f6bff;--accent-d:#1f55d8;--bg:#f7f8fa;--dark:#0b1220;--warn:#fff7e6;--warn-line:#f0d9a8}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Noto Sans KR",sans-serif;color:var(--ink);background:var(--bg);line-height:1.75;-webkit-font-smoothing:antialiased;word-break:keep-all}
.wrap{max-width:860px;margin:0 auto;padding:0 22px}
header{position:sticky;top:0;z-index:10;background:rgba(247,248,250,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;height:58px}
.logo{font-weight:800;font-size:18px;letter-spacing:-.02em;color:var(--ink);text-decoration:none}
.logo small{font-weight:600;color:var(--sub);font-size:12.5px;margin-left:6px}
nav a{color:var(--sub);text-decoration:none;font-size:14px;margin-left:16px}
nav a:hover,nav a[aria-current="page"]{color:var(--ink)}
main{padding:34px 0 64px}
.crumb{font-size:13px;color:var(--sub);margin:0 0 14px}
.crumb a{color:var(--sub)}
h1{font-size:clamp(26px,5vw,36px);line-height:1.28;letter-spacing:-.03em;margin:0 0 14px}
h2{font-size:clamp(20px,3.4vw,25px);letter-spacing:-.02em;margin:40px 0 10px;line-height:1.35}
h3{font-size:17.5px;margin:26px 0 6px}
p{margin:0 0 14px}
.meta{font-size:13.5px;color:var(--sub);margin:0 0 22px}
.summary{background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:16px 20px;margin:0 0 26px}
.summary b{display:block;margin-bottom:6px}
.summary ul{margin:0;padding-left:20px}
.note{background:var(--warn);border:1px solid var(--warn-line);border-radius:12px;padding:14px 18px;margin:18px 0;font-size:15px}
.tblwrap{overflow-x:auto;margin:14px 0 20px;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;min-width:520px;background:#fff;font-size:14.5px}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
th{background:#eef2f8;font-weight:700}
td.n,th.n{text-align:right;font-variant-numeric:tabular-nums}
caption{caption-side:bottom;text-align:left;font-size:13px;color:var(--sub);padding-top:6px}
code,.f{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em;background:#eef2f8;border-radius:6px;padding:1px 6px}
.formula{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:12px 0 18px;overflow-x:auto;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:15px;white-space:pre}
ol,ul{padding-left:22px;margin:0 0 14px}
li{margin-bottom:6px}
a{color:var(--accent)}
.cards{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));margin:18px 0}
.card{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;color:inherit;text-decoration:none}
a.card:hover{border-color:var(--accent)}
.card h3{margin:0 0 6px;font-size:17px;color:var(--ink)}
.card p{margin:0;color:var(--sub);font-size:14.5px}
.card .k{font-size:12px;font-weight:700;color:var(--accent);margin-bottom:6px;display:block}
.related{border-top:1px solid var(--line);margin-top:40px;padding-top:6px}
.calc{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;margin:18px 0}
.fields{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
label{display:block;font-size:13.5px;font-weight:700;margin-bottom:4px}
label small{font-weight:400;color:var(--sub)}
input[type=number],input[type=text]{width:100%;padding:10px 12px;border:1px solid #cfd6e0;border-radius:10px;font-size:16px;background:#fff;color:var(--ink)}
input:focus{outline:2px solid var(--accent);outline-offset:1px}
.btn{display:inline-block;border:0;background:var(--accent);color:#fff;border-radius:10px;padding:11px 18px;font-weight:700;font-size:15px;cursor:pointer;margin-top:6px}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.err{color:#b42318;font-weight:600;margin:10px 0 0;min-height:1.4em}
.faq dt{font-weight:700;margin-top:16px}
.faq dd{margin:4px 0 0}
footer{padding:30px 0 60px;color:var(--sub);font-size:13.5px;border-top:1px solid var(--line)}
footer a{color:var(--sub)}
footer div{margin-bottom:4px}
@media (max-width:640px){nav a{margin-left:12px;font-size:13px}.logo small{display:none}main{padding-top:24px}}