/* ============================================================
   2026 육아·출산 계산기 — 공통 스타일 (모바일 퍼스트)
   ============================================================ */
:root {
  --primary: #4263eb;
  --primary-soft: #edf2ff;
  --primary-dark: #364fc7;
  --accent: #f76707;
  --text: #212529;
  --text-sub: #5c6470;
  --line: #e9ecf1;
  --bg: #f6f7fa;
  --card: #ffffff;
  --good: #2b8a3e;
  --warn: #e03131;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}
img { max-width: 100%; }
a { color: var(--primary); }

.container { max-width: 760px; margin: 0 auto; padding: 0 16px; }

/* ---------- 헤더 + 탭 내비게이션 ---------- */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header .brand {
  display: block;
  padding: 12px 16px 4px;
  font-weight: 800;
  font-size: 15px;
  color: var(--text);
  text-decoration: none;
  max-width: 760px;
  margin: 0 auto;
}
.site-header .brand span { color: var(--primary); }
.tab-nav {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 12px;
}
/* 데스크톱: 탭 6개가 한 줄에 다 보이도록 폭 확장 */
@media (min-width: 920px) {
  .tab-nav { max-width: 900px; }
}
@media (min-width: 760px) and (max-width: 919.9px) {
  .tab-nav { flex-wrap: wrap; overflow-x: visible; }
}
.tab-nav::-webkit-scrollbar { display: none; }
.tab-nav a {
  flex: 0 0 auto;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-sub);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}
.tab-nav a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* ---------- 본문 ---------- */
main { padding: 20px 0 40px; }
h1 { font-size: 24px; line-height: 1.35; margin: 8px 0 10px; }
h2 { font-size: 19px; margin: 32px 0 12px; }
h3 { font-size: 16px; margin: 20px 0 8px; }
.lead { color: var(--text-sub); font-size: 15px; margin: 0 0 20px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 16px;
  margin: 16px 0;
}

/* 2026 변경점 하이라이트 박스 */
.highlight-box {
  background: var(--primary-soft);
  border: 1px solid #d0dcff;
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 14px;
  margin: 16px 0;
}
.highlight-box strong { color: var(--primary-dark); }
.highlight-box ul { margin: 8px 0 0; padding-left: 18px; }
.highlight-box li { margin: 4px 0; }

/* ---------- 폼 ---------- */
.field { margin-bottom: 18px; }
.field > label {
  display: block;
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 6px;
}
.field .hint { font-size: 12.5px; color: var(--text-sub); margin-top: 4px; }

.input-won { position: relative; }
.input-won input {
  width: 100%;
  padding: 12px 44px 12px 14px;
  font-size: 17px;
  font-weight: 600;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  outline: none;
  text-align: right;
}
.input-won input:focus { border-color: var(--primary); }
.input-won .unit {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-sub);
  font-size: 14px;
  pointer-events: none;
}

input[type="date"], select {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  outline: none;
}
input[type="date"]:focus, select:focus { border-color: var(--primary); }

/* 슬라이더 */
.slider-row { display: flex; align-items: center; gap: 12px; }
.slider-row input[type="range"] { flex: 1; accent-color: var(--primary); height: 28px; }
.slider-value {
  flex: 0 0 auto;
  min-width: 74px;
  text-align: center;
  font-weight: 800;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 15px;
}

/* 세그먼트(라디오) 버튼 */
.segment {
  display: flex;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.segment label {
  flex: 1;
  text-align: center;
  padding: 11px 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-sub);
  cursor: pointer;
  background: #fff;
  user-select: none;
}
.segment input { display: none; }
.segment input:checked + label,
.segment label:has(input:checked) {
  background: var(--primary);
  color: #fff;
}

/* 체크박스 행 */
.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
}
.check-row input { width: 18px; height: 18px; accent-color: var(--primary); }

/* ---------- 결과 ---------- */
.result-box {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: var(--radius);
  padding: 20px 18px;
  margin: 20px 0 12px;
}
.result-box .label { font-size: 13.5px; opacity: 0.85; }
.result-box .total {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin: 2px 0 4px;
}
.result-box .sub { font-size: 13.5px; opacity: 0.9; }
.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}
.result-grid .cell {
  background: rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  padding: 10px 12px;
}
.result-grid .cell .k { font-size: 12px; opacity: 0.85; }
.result-grid .cell .v { font-size: 16px; font-weight: 700; }

/* 결과 표 */
table.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 12px 0;
}
.result-table th, .result-table td {
  padding: 9px 8px;
  border-bottom: 1px solid var(--line);
  text-align: right;
}
.result-table th { background: #f2f4f8; font-size: 13px; color: var(--text-sub); }
.result-table th:first-child, .result-table td:first-child { text-align: left; }
.result-table tr.total-row td { font-weight: 800; color: var(--primary-dark); background: var(--primary-soft); }

/* 막대 그래프 (순수 CSS) */
.chart {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 140px;
  margin: 18px 2px 4px;
}
.chart .bar {
  flex: 1;
  background: linear-gradient(180deg, #748ffc, var(--primary));
  border-radius: 4px 4px 0 0;
  position: relative;
  min-height: 3px;
}
.chart .bar.alt { background: linear-gradient(180deg, #ffc078, var(--accent)); }
.chart .bar .tip {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 10px;
  color: var(--text-sub);
  white-space: nowrap;
}
.chart-x { display: flex; gap: 4px; margin: 0 2px 8px; }
.chart-x span { flex: 1; text-align: center; font-size: 10px; color: var(--text-sub); }

/* 경고/알림 */
.notice { font-size: 13px; color: var(--text-sub); margin-top: 10px; }
.warn-text { color: var(--warn); font-size: 13.5px; font-weight: 700; margin-top: 8px; }

/* ---------- 광고 자리 ---------- */
.ad-slot {
  min-height: 100px;
  margin: 24px 0;
  border: 1.5px dashed #cfd5e1;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #aeb6c4;
  font-size: 12px;
  letter-spacing: 2px;
  background: #fbfcfe;
}
.ad-slot.coupang { min-height: 120px; }
.coupang-ad { margin: 24px 0; text-align: center; }
.coupang-ad .notice { text-align: center; }

/* ---------- FAQ ---------- */
.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  margin: 8px 0;
  padding: 0 16px;
}
.faq summary {
  font-weight: 700;
  font-size: 15px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 24px;
}
.faq summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 12px;
  color: var(--primary);
  font-size: 18px;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 14px; font-size: 14.5px; color: #38404c; }

/* ---------- 설명/근거 ---------- */
.explain { font-size: 14.5px; color: #38404c; }
.explain .formula {
  background: #f2f4f8;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13.5px;
  margin: 10px 0;
  overflow-x: auto;
  white-space: nowrap;
}

/* ---------- 푸터 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--card);
  padding: 24px 0 36px;
  font-size: 13px;
  color: var(--text-sub);
}
.site-footer .links { margin-bottom: 12px; }
.site-footer .links a { margin-right: 12px; }
.site-footer .disclaimer { line-height: 1.7; }

/* ---------- 데스크톱 ---------- */
@media (min-width: 640px) {
  h1 { font-size: 28px; }
  .card { padding: 26px 24px; }
  .result-box .total { font-size: 34px; }
}