:root {
  --bg: #f7f7f5; --panel: #ffffff; --line: #e4e3de; --text: #1d1d1b; --muted: #74736d;
  --accent: #2f5d50; --accent-soft: #e3ece8; --accent-text: #fff;
  --error: #b5473a; --error-soft: #f8e4e1; --warn: #8d5b08; --warn-soft: #f8ecd6; --info: #3d5f8a; --info-soft: #e3ebf5; --ok: #23784f;
  --code: #f1f0ec; --radius: 14px;
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615; --panel: #1f1f1d; --line: #33332f; --text: #ecebe6; --muted: #9a9993;
    --accent: #77b9a2; --accent-soft: #23342e; --accent-text: #10201b;
    --error: #e07a6a; --error-soft: #3a221e; --warn: #e3a94a; --warn-soft: #3a2f1c; --info: #8fb2e0; --info-soft: #1e2a3a; --ok: #5ccb92; --code: #2a2a27;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text); }
a { color: var(--accent); }
h1 { font-size: 26px; line-height: 1.3; margin: 0 0 8px; letter-spacing: -.01em; }
h2 { font-size: 17px; margin: 0 0 10px; }
h3 { font-size: 15px; margin: 14px 0 6px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
/* 사이트 틀 */
.top { display: flex; align-items: center; gap: 12px; max-width: 980px; margin: 0 auto; padding: 14px 16px; }
.brand { font-weight: 800; font-size: 18px; color: var(--text); text-decoration: none; }
.lang { margin-left: auto; font-size: 14px; padding: 10px 4px; }
main { max-width: 980px; margin: 0 auto; padding: 8px 16px 40px; display: flex; flex-direction: column; gap: 18px; }
.lead { margin: 0; font-size: 16px; }
.note { margin: 0; font-size: 14px; color: var(--ok); }
.doc { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.doc p:last-child { margin-bottom: 0; }
.doc ol { margin: 0; padding-left: 22px; }
.doc li { margin: 4px 0; }
footer { max-width: 980px; margin: 0 auto; padding: 20px 16px 40px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 14px; }
footer a { padding: 8px 0; }
footer p { flex-basis: 100%; margin: 4px 0 0; }
@media (max-width: 600px) { h1 { font-size: 22px; } .doc { padding: 16px; } }
.prose h1 { font-size: 24px; }
.prose h2 { font-size: 18px; margin: 22px 0 8px; }
.prose p { margin: 0 0 12px; }
.prose pre { background: var(--code); border-radius: 10px; padding: 12px 14px; overflow-x: auto; font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.prose code { background: var(--code); border-radius: 4px; padding: 1px 5px; font: 13px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; overflow-wrap: anywhere; }
.prose pre code { background: none; padding: 0; overflow-wrap: normal; }
.prose a { overflow-wrap: anywhere; }
.prose .table { overflow-x: auto; margin: 0 0 12px; }
.prose table { border-collapse: collapse; font-size: 14px; min-width: 100%; }
.prose th, .prose td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--code); font-weight: 600; }
.prose .num { text-align: right; font-variant-numeric: tabular-nums; }
.btn-link { display: inline-block; padding: 10px 18px; border-radius: 12px; background: var(--accent); color: var(--accent-text); font-weight: 600; text-decoration: none; }
/* 사이트 틀: 머리 메뉴 */
.top nav { margin-left: auto; display: flex; gap: 14px; font-size: 14px; }
.top nav a { padding: 10px 2px; }
/* 계산기 */
.calc { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; display: flex; flex-direction: column; gap: 14px; }
.calc .fields { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.calc label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; font-size: 14px; }
.calc select, .calc input { font: inherit; font-size: 16px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--text); min-height: 44px; width: 100%; }
.calc .money { grid-column: 1 / -1; }
.calc .hint { font-weight: 400; color: var(--muted); font-size: 13px; min-height: 1.2em; }
.result { border-top: 1px solid var(--line); padding-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.result .cap { font-size: 15px; }
.result .cap b { display: block; font-size: 28px; line-height: 1.25; color: var(--accent); font-variant-numeric: tabular-nums; }
.result dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; margin: 0; font-size: 14px; }
.result dt { color: var(--muted); }
.result dd { margin: 0; font-variant-numeric: tabular-nums; }
.result ul { margin: 0; padding-left: 18px; font-size: 14px; }
.result li { margin: 3px 0; }
.result .fraction { margin: 0; font-size: 13px; color: var(--muted); }
.out-of-scope, .bad-input { margin: 0; padding: 12px 14px; border-radius: 10px; background: var(--warn-soft); color: var(--warn); font-weight: 600; }
.basis { font-size: 13px; color: var(--muted); }
.basis p { margin: 0 0 8px; }
.basis ul { margin: 0; padding-left: 18px; }
@media (max-width: 600px) { .calc { padding: 16px; } .calc .fields { grid-template-columns: 1fr; } .top nav { gap: 10px; } .result .cap b { font-size: 24px; } }