:root {
  --bg: #f4f6f8;
  --card: #fff;
  --text: #1c2530;
  --muted: #6b7785;
  --line: #dde3ea;
  --primary: #2563eb;
  --ok: #15803d;
  --ok-bg: #e8f6ec;
  --bad: #b91c1c;
  --bad-bg: #fdecec;
  --gap: rgba(245, 158, 11, 0.18);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Pretendard", "Malgun Gothic", "Noto Sans KR", sans-serif;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
.header { padding: 20px 16px 8px; max-width: 760px; margin: 0 auto; }
.header h1 { margin: 0; font-size: 1.5rem; }
.header p { margin: 2px 0 0; color: var(--muted); font-size: .95rem; }
.wrap { max-width: 760px; margin: 0 auto; padding: 8px 12px 40px; display: grid; gap: 12px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.card h2 { margin: 0 0 10px; font-size: 1.05rem; }

/* 요약 카드: 스크롤해도 상단에 남도록 */
.summary { position: sticky; top: var(--header-h, 60px); z-index: 5; box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.summary.ok { border-color: var(--ok); background: var(--ok-bg); }
.summary.bad { border-color: var(--bad); background: var(--bad-bg); }
.verdict { margin: 0 0 8px; font-size: 1.15rem; font-weight: 700; }
.summary.ok .verdict { color: var(--ok); }
.summary.bad .verdict { color: var(--bad); }
.stats { display: grid; grid-template-columns: 1fr; gap: 4px 12px; margin: 0; font-size: .92rem; }
.stats div { display: flex; justify-content: space-between; gap: 8px; }
.stats dt { color: var(--muted); }
.stats dd { margin: 0; font-weight: 600; text-align: right; }
@media (min-width: 560px) { .stats { grid-template-columns: 1fr 1fr; } }

/* 입력 폼 */
details { border-bottom: 1px solid var(--line); }
details:last-of-type { border-bottom: 0; }
summary { cursor: pointer; padding: 12px 2px; font-weight: 700; }
.fields { display: grid; gap: 10px; padding: 0 2px 14px; }
.field label { display: block; font-size: .88rem; margin-bottom: 3px; }
.field .hint { color: var(--muted); font-size: .78rem; margin-top: 2px; }
.input-row { display: flex; align-items: center; gap: 6px; }
.input-row input[type=text], .input-row input[type=number] {
  flex: 1; min-width: 0; font-size: 16px; /* iOS 확대 방지 */
  padding: 9px 10px; border: 1px solid var(--line); border-radius: 8px; text-align: right;
}
.input-row input:focus { outline: 2px solid var(--primary); border-color: transparent; }
.unit { color: var(--muted); font-size: .85rem; min-width: 2.2em; }
.check { display: flex; align-items: center; gap: 8px; font-size: .9rem; }
.reset { margin-top: 10px; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 6px 12px; color: var(--muted); cursor: pointer; }

.radios { display: flex; flex-wrap: wrap; gap: 6px 14px; }
.radio { display: flex; align-items: center; gap: 5px; font-size: .92rem; margin: 0; }
.field-sub { margin-top: 6px; }
.field-sub label { font-size: .78rem; color: var(--muted); }
.field-sub select { width: 100%; font-size: 16px; padding: 8px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
[hidden] { display: none !important; }
.notes { background: #f6f8fb; border-radius: 8px; padding: 8px 10px; font-size: .85rem; }
.notes p { margin: 0 0 6px; }
.notes p:last-child { margin: 0; }
.notes .hint { color: var(--muted); font-size: .78rem; }
.warn { color: var(--bad); font-weight: 600; }
.alts { margin: 0; padding-left: 18px; }
.alts li { margin-bottom: 8px; }
.table-wrap { overflow-x: auto; margin-top: 6px; }
.table-wrap table { border-collapse: collapse; width: 100%; font-size: .8rem; white-space: nowrap; }
.table-wrap th, .table-wrap td { padding: 5px 8px; text-align: right; border-bottom: 1px solid var(--line); }
.table-wrap th { background: #f6f8fb; position: sticky; top: 0; }
.table-wrap td:first-child, .table-wrap th:first-child { text-align: center; }
.gap-row td { background: rgba(245, 158, 11, 0.12); }
.neg { color: var(--bad); font-weight: 600; }
.chart-box { position: relative; height: 300px; }
.legend-note { margin: 8px 0 0; font-size: .8rem; color: var(--muted); }
.swatch { display: inline-block; width: 12px; height: 12px; border-radius: 2px; vertical-align: -1px; }
.swatch.gap { background: var(--gap); border: 1px solid #f59e0b; }
.notice { font-size: .8rem; color: var(--muted); }
.notice p { margin: 0 0 6px; }

/* ===== 사이트 확장 (반퇴 준비 공간) ===== */
body { background: #faf7f1; font-size: 17px; }
.site-header { background: #fffaf2; border-bottom: 1px solid #eadfce; position: sticky; top: 0; z-index: 10; }
.site-header-in { max-width: 760px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.logo { font-weight: 800; font-size: 1.15rem; color: #92400e; text-decoration: none; }
.site-nav { display: flex; gap: 14px; flex-wrap: wrap; }
.site-nav a { color: #57534e; text-decoration: none; font-size: .92rem; }
.site-nav a:hover { color: #92400e; }
.hero { padding: 26px 6px 8px; }
.hero h1 { margin: 0 0 12px; font-size: 1.9rem; line-height: 1.3; color: #292524; }
.hero p { margin: 0 0 16px; color: #44403c; }
.cta { display: inline-block; background: #d97706; color: #fff; font-weight: 700; padding: 12px 20px; border-radius: 10px; text-decoration: none; }
.cta:hover { background: #b45309; }
.hero-note { margin-top: 12px; font-size: .88rem; color: #78716c; }
.calc-anchor { scroll-margin-top: calc(var(--header-h, 60px) + 12px); }
.why-grid { display: grid; gap: 14px; }
@media (min-width: 640px) { .why-grid { grid-template-columns: 1fr 1fr 1fr; } }
.why-item h3 { margin: 0 0 6px; font-size: .98rem; color: #92400e; }
.why-item p { margin: 0; font-size: .9rem; color: #44403c; }
.guide-grid { display: grid; gap: 10px; }
@media (min-width: 640px) { .guide-grid { grid-template-columns: 1fr 1fr; } }
.guide-card { display: block; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; text-decoration: none; color: var(--text); background: #fffdf8; }
.guide-card:hover { border-color: #d97706; }
.guide-card h3 { margin: 0 0 4px; font-size: 1rem; }
.guide-card p { margin: 0; font-size: .88rem; color: var(--muted); }
.about p { margin: 0 0 10px; }
.about-note { font-size: .85rem; color: var(--muted); }
.site-footer { max-width: 760px; margin: 0 auto; padding: 10px 16px 34px; color: #78716c; font-size: .88rem; }
.site-footer p { margin: 0 0 4px; }
.foot-note { font-size: .8rem; }
/* 가이드 글 페이지 */
.article { font-size: 1rem; }
.article h1 { font-size: 1.5rem; line-height: 1.35; margin: 0 0 6px; }
.article .lead { color: #44403c; margin: 0 0 18px; }
.article h2 { font-size: 1.15rem; margin: 22px 0 8px; color: #92400e; }
.article p, .article li { color: #292524; }
.article ul, .article ol { padding-left: 20px; }
.article li { margin-bottom: 6px; }
.article .point { background: #fff7e8; border: 1px solid #f3dfba; border-radius: 10px; padding: 12px 14px; margin: 14px 0; }
.article .point p { margin: 0; }
.article table { border-collapse: collapse; width: 100%; font-size: .9rem; margin: 10px 0; }
.article th, .article td { border: 1px solid var(--line); padding: 7px 9px; text-align: left; }
.article th { background: #f6f8fb; }
.back-link { display: inline-block; margin-bottom: 12px; color: #92400e; text-decoration: none; font-size: .9rem; }

/* 홈 화면에 추가 버튼·안내 */
.install-cta { position: fixed; left: 14px; bottom: 14px; z-index: 30; background: #d97706; color: #fff; border: 0; border-radius: 999px; padding: 12px 18px; font-size: .95rem; font-weight: 700; box-shadow: 0 4px 14px rgba(0,0,0,.25); cursor: pointer; }
.install-cta:hover { background: #b45309; }
.install-guide { position: fixed; left: 12px; right: 12px; bottom: 70px; z-index: 31; max-width: 480px; margin: 0 auto; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; box-shadow: 0 8px 24px rgba(0,0,0,.22); font-size: .92rem; }
.install-guide ol { margin: 8px 0 10px; padding-left: 20px; }
.install-guide li { margin-bottom: 5px; }
.install-guide p { margin: 8px 0 10px; }
.install-guide-close { background: #d97706; color: #fff; border: 0; border-radius: 8px; padding: 8px 16px; font-weight: 700; cursor: pointer; }

/* 업데이트 알림 배너: 상단 고정 해제형 — 스크롤하면 지나간다. 계산 흐름을 막지 않는다 */
.update-banner { display: flex; align-items: center; gap: 10px; background: #fff7e8; border: 1px solid #f3dfba; border-radius: 10px; padding: 10px 12px; font-size: .9rem; }
.update-banner p { margin: 0; flex: 1; }
.update-banner a { color: #92400e; font-weight: 700; white-space: nowrap; }
.update-banner-close { background: none; border: 0; font-size: 1.1rem; cursor: pointer; color: #78716c; line-height: 1; }
/* 업데이트 소식 */
.update-list { margin: 0 0 12px; padding-left: 20px; }
.update-list li { margin-bottom: 6px; font-size: .92rem; }
.update-list .tag { display: inline-block; background: #fff7e8; border: 1px solid #f3dfba; border-radius: 999px; padding: 0 7px; font-size: .78rem; color: #92400e; margin-left: 4px; }
.update-list .date { color: var(--muted); font-size: .85rem; }