*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#ffffff;--tx:#1f2328;--tx2:#5a636e;--tx3:#8b95a1;--line:#e8ebef;--soft:#f7f8fa;--brand:#070910;--accent:#2563eb}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--tx);line-height:1.75;letter-spacing:-.015em;
  font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Pretendard","Noto Sans KR","Malgun Gothic",sans-serif;
  -webkit-font-smoothing:antialiased}
.topbar{background:var(--brand)}
.topbar .in{max-width:760px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;gap:12px}
.topbar a{color:#f2f5fa;text-decoration:none;font-weight:700;font-size:15px;letter-spacing:-.02em}
.topbar span{color:#5f6b81;font-size:13px}
.topbar nav{margin-left:auto;display:flex;gap:14px}
.topbar nav a{font-size:13px;font-weight:500;color:#aab4c4;white-space:nowrap}
@media(max-width:560px){.topbar span{display:none}}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
.tool{padding:38px 0 10px}
.cat{display:inline-block;font-size:12px;font-weight:700;color:var(--accent);
  background:rgba(37,99,235,.08);border-radius:999px;padding:5px 11px;margin-bottom:14px}
h1{font-size:clamp(24px,4.4vw,33px);line-height:1.34;letter-spacing:-.03em;font-weight:800}
.intro{margin-top:14px;color:var(--tx2);font-size:15.5px}
.panel{margin-top:26px;border:1px solid var(--line);border-radius:14px;padding:22px;background:var(--soft)}
.panel h2{font-size:16px;margin-bottom:14px;letter-spacing:-.02em}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:560px){.grid2{grid-template-columns:1fr}}
.field label{display:block;font-size:13px;font-weight:700;color:var(--tx2);margin-bottom:6px}
.field input,.field select{width:100%;padding:11px 12px;border:1px solid #d6dce3;border-radius:10px;
  font-size:16px;background:#fff;color:var(--tx);font-family:inherit}
.field input:focus,.field select:focus{outline:2px solid rgba(37,99,235,.35);border-color:var(--accent)}
.hint{font-size:12px;color:var(--tx3);margin-top:5px}
.btn{margin-top:18px;width:100%;padding:14px;border:0;border-radius:10px;background:var(--brand);
  color:#fff;font-size:16px;font-weight:700;cursor:pointer;font-family:inherit;letter-spacing:-.01em}
.btn:hover{opacity:.92}
.result{margin-top:26px}
.result h2{font-size:18px;margin-bottom:12px;letter-spacing:-.02em}
table{width:100%;border-collapse:collapse;margin:12px 0;font-size:15px}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:right}
th:first-child,td:first-child{text-align:left}
th{background:var(--soft);font-weight:700}
td b{font-variant-numeric:tabular-nums}
.big{margin:14px 0;padding:16px 18px;border-radius:12px;background:rgba(37,99,235,.07);font-size:15.5px}
.big b{font-size:19px}
.warn{margin:14px 0;padding:14px 16px;border-radius:12px;background:#fff7ed;border:1px solid #fed7aa;
  color:#7c2d12;font-size:14px;line-height:1.7}
.formula{margin-top:30px;padding-top:20px;border-top:1px solid var(--line)}
.formula h2{font-size:17px;margin-bottom:10px}
.formula p,.formula li{font-size:14.5px;color:var(--tx2)}
.formula ul{margin:10px 0 10px 20px}
.formula code{background:var(--soft);border:1px solid var(--line);border-radius:6px;padding:2px 7px;font-size:13.5px}
.formula a{color:var(--accent)}
details{margin:14px 0}
details summary{cursor:pointer;font-weight:700;font-size:14.5px;color:var(--accent)}
details .tblwrap{max-height:420px;overflow:auto;margin-top:10px;border:1px solid var(--line);border-radius:10px}
details table{margin:0;font-size:13.5px}
.related{margin:34px 0 0;padding:22px 0 0;border-top:1px solid var(--line)}
.related h2{font-size:16px;letter-spacing:-.02em;margin-bottom:12px}
.related a{display:block;color:inherit;text-decoration:none;font-size:15px;
  padding:9px 0;border-bottom:1px solid var(--line);line-height:1.5}
.related a:last-child{border-bottom:0}
footer{margin-top:44px;padding:26px 0 46px;border-top:1px solid var(--line);color:var(--tx3);font-size:13px}
footer .fnav{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:10px}
footer .fnav a{color:var(--tx2);text-decoration:none}