:root {
  --brand: #ffb300; --brand-soft: #fff4d6; --ink: #1c1828; --ink-2: #4a4458; --ink-3: #7a7488;
  --line: #e7e3ec; --bg: #ffffff; --panel: #faf9fb; --good: #0f7a4a; --bad: #c0362c;
  --radius: 12px;
  font-family: "Pretendard Variable", Pretendard, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: var(--ink); background: var(--bg);
  -webkit-text-size-adjust: 100%;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); line-height: 1.6; font-size: 16px; }
a { color: #8a5a00; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }

.site-head { border-bottom: 1px solid var(--line); background: var(--ink); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.site-head a { color: #fff; text-decoration: none; font-weight: 700; }
.site-head a b { color: var(--brand); }
.site-head nav a { font-weight: 500; font-size: 14px; opacity: .8; margin-left: 14px; }

h1 { font-size: 26px; line-height: 1.3; margin: 28px 0 8px; letter-spacing: -0.02em; }
.lead { color: var(--ink-2); margin: 0 0 20px; }
.meta { font-size: 13px; color: var(--ink-3); margin: 0 0 18px; }

.tool { border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); padding: 18px 16px; margin-bottom: 28px;
        box-shadow: 0 1px 0 rgba(28,24,40,.03); }
.calc { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 14px; }
.calc .sec { grid-column: 1 / -1; margin: 8px 0 -4px; font-size: 14px; color: var(--ink-3); font-weight: 600; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; border: 0; padding: 0; margin: 0; }
.field > span, .field legend { font-size: 14px; font-weight: 600; color: var(--ink-2); padding: 0; }
.field.wide, fieldset.field, .check { grid-column: 1 / -1; }
.input { display: flex; align-items: center; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); padding: 0 12px; }
.input:focus-within, select:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); outline: none; }
.input input { flex: 1; min-width: 0; border: 0; outline: 0; font: inherit; font-size: 17px; padding: 11px 0; text-align: right; background: transparent; font-variant-numeric: tabular-nums; }
.input em { font-style: normal; color: var(--ink-3); margin-left: 6px; font-size: 14px; }
select, input[type=date] { font: inherit; font-size: 15px; border: 1px solid var(--line); border-radius: 10px; padding: 11px 10px; background: var(--bg); width: 100%; min-width: 0; color: var(--ink); }
.help, .kr { font-size: 12.5px; color: var(--ink-3); line-height: 1.45; }
.kr { text-align: right; min-height: 1em; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip input { position: absolute; opacity: 0; }
.chip span { display: inline-block; border: 1px solid var(--line); border-radius: 999px; padding: 8px 14px; font-size: 14px; cursor: pointer; background: var(--bg); }
.chip input:checked + span { background: var(--ink); color: #fff; border-color: var(--ink); }
.chip input:focus-visible + span { box-shadow: 0 0 0 3px var(--brand-soft); }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; color: var(--ink-2); }
.check input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--ink); }

.result { margin-top: 18px; border-top: 2px solid var(--ink); padding-top: 14px; }
.big { background: var(--brand-soft); border-radius: 10px; padding: 14px 16px; margin-bottom: 10px; display: flex; flex-direction: column; }
.big span { font-size: 14px; color: var(--ink-2); font-weight: 600; }
.big strong { font-size: 28px; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; line-height: 1.25; }
.big small { font-size: 13px; color: var(--ink-2); }
.row { display: flex; justify-content: space-between; gap: 12px; padding: 8px 2px; border-bottom: 1px dashed var(--line); font-size: 15px; }
.row span { color: var(--ink-2); }
.row b { font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
.row.strong b, .row.strong span { color: var(--ink); font-weight: 700; }
.res-head { font-size: 15px; margin: 16px 0 4px; }
.warn { background: #fdeceb; color: var(--bad); border-radius: 8px; padding: 10px 12px; font-size: 14px; margin: 8px 0; }
.info { background: var(--panel); color: var(--ink-2); border-radius: 8px; padding: 10px 12px; font-size: 14px; margin: 8px 0; }
.note { font-size: 12.5px; color: var(--ink-3); margin: 14px 0 0; }

article h2 { font-size: 20px; margin: 32px 0 10px; letter-spacing: -0.01em; }
article p, article li { color: var(--ink-2); }
article table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 10px 0; }
article th, article td { border: 1px solid var(--line); padding: 8px; text-align: left; }
article th { background: var(--panel); }
.formula { background: var(--panel); border-left: 4px solid var(--brand); padding: 12px 14px; border-radius: 0 8px 8px 0; font-size: 15px; }
.related { display: grid; gap: 8px; padding: 0; list-style: none; }
.related a { display: block; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; text-decoration: none; color: var(--ink); }

.grid-tools { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 0; list-style: none; }
.grid-tools a { display: block; height: 100%; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: var(--ink); }
.grid-tools b { display: block; font-size: 16px; margin-bottom: 4px; }
.grid-tools small { color: var(--ink-3); font-size: 13px; }

.site-foot { border-top: 1px solid var(--line); margin-top: 40px; padding: 20px 0 32px; font-size: 13px; color: var(--ink-3); }
.site-foot a { color: var(--ink-3); margin-right: 12px; }

/* iframe 삽입 모드: 계산기 박스만 보이게 */
.is-embed body { background: transparent; }
.is-embed .site-head, .is-embed .site-foot, .is-embed article > :not(.tool), .is-embed h1, .is-embed .lead, .is-embed .meta { display: none; }
.is-embed .wrap { padding: 0; max-width: none; }
.is-embed .tool { margin: 0; border-radius: 12px; }
.is-embed .embed-foot { display: block; }
.embed-foot { display: none; font-size: 12px; color: var(--ink-3); text-align: right; margin-top: 8px; }

@media (max-width: 520px) {
  .calc, .grid-tools { grid-template-columns: 1fr; }
  h1 { font-size: 22px; }
  .big strong { font-size: 24px; }
}