/* KiraDuit base styles - zero dependencies, no web fonts. */
*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #f5f7f6;
  --surface: #ffffff;
  --text: #1a2730;
  --muted: #5d6b75;
  --primary: #0c7a51;
  --primary-dark: #095e3e;
  --primary-soft: #e6f4ee;
  --accent: #d99a16;
  --border: #e4e9e7;
  --danger: #b4232a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16,40,30,.06), 0 2px 8px rgba(16,40,30,.05);
  --maxw: 760px;
  --maxw-wide: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
}
a { color: var(--primary-dark); }
img { max-width: 100%; height: auto; }
h1, h2, h3 { line-height: 1.25; color: var(--text); }
h1 { font-size: 1.85rem; margin: .2em 0 .4em; }
h2 { font-size: 1.35rem; margin: 1.6em 0 .5em; }
h3 { font-size: 1.1rem; margin: 1.3em 0 .4em; }

/* layout */
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 18px; }
.container.wide { max-width: var(--maxw-wide); }
main { padding: 24px 0 50px; }

/* header */
.site-header { background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.site-header .bar { max-width: var(--maxw-wide); margin: 0 auto; padding: 12px 18px; display: flex; align-items: center; gap: 16px; }
.logo { font-weight: 800; font-size: 1.25rem; color: var(--primary-dark); text-decoration: none; letter-spacing: -.02em; }
.logo span { color: var(--accent); }
.site-nav { margin-left: auto; display: flex; gap: 16px; flex-wrap: wrap; }
.site-nav a { text-decoration: none; color: var(--muted); font-size: .95rem; font-weight: 600; }
.site-nav a:hover { color: var(--primary-dark); }

/* hero */
.hero { text-align: center; padding: 28px 0 6px; }
.hero h1 { font-size: 2.1rem; }
.hero p { color: var(--muted); font-size: 1.1rem; max-width: 580px; margin: .4em auto 0; }

/* breadcrumb */
.crumb { font-size: .85rem; color: var(--muted); margin-bottom: 8px; }
.crumb a { color: var(--muted); }

/* card grid */
.section-title { font-size: 1.15rem; margin: 28px 0 12px; padding-bottom: 6px; border-bottom: 2px solid var(--primary-soft); }
.calc-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.calc-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; text-decoration: none; color: inherit; display: block; transition: border-color .12s, transform .12s, box-shadow .12s; }
.calc-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.calc-card .ttl { font-weight: 700; color: var(--primary-dark); }
.calc-card .desc { font-size: .9rem; color: var(--muted); margin-top: 4px; }

/* calculator widget */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.calc { padding: 20px; margin: 18px 0; }
.calc-form { display: grid; gap: 14px; }
@media (min-width: 540px) { .calc-form { grid-template-columns: 1fr 1fr; } }
.field { display: flex; flex-direction: column; gap: 5px; }
.field.full { grid-column: 1 / -1; }
.field label { font-weight: 600; font-size: .92rem; }
.field .hint { font-size: .8rem; color: var(--muted); font-weight: 400; }
.input-wrap { display: flex; align-items: stretch; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; background: #fff; }
.input-wrap:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.input-wrap .affix { background: #f1f4f3; padding: 10px 11px; color: var(--muted); font-size: .92rem; display: flex; align-items: center; white-space: nowrap; }
.input-wrap input, .input-wrap select { border: 0; outline: 0; padding: 10px 11px; font-size: 1rem; width: 100%; background: transparent; font-family: inherit; color: inherit; }
.input-wrap select { cursor: pointer; }

/* result */
.calc-result { margin-top: 18px; background: var(--primary-soft); border-radius: var(--radius); padding: 18px; }
.result-label { font-size: .82rem; color: var(--primary-dark); font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
.result-primary { font-size: 2.4rem; font-weight: 800; color: var(--primary-dark); line-height: 1.1; margin: 2px 0 4px; font-variant-numeric: tabular-nums; }
.result-note { font-size: .88rem; color: var(--muted); }
.breakdown { width: 100%; border-collapse: collapse; margin-top: 12px; background: #fff; border-radius: var(--radius-sm); overflow: hidden; }
.breakdown td { padding: 9px 12px; border-bottom: 1px solid var(--border); font-size: .93rem; }
.breakdown tr:last-child td { border-bottom: 0; }
.breakdown td:last-child { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
.breakdown tr.total td { background: #f1f4f3; font-weight: 700; }

/* prose (guides, legal pages) */
.prose p, .prose li { color: var(--text); }
.prose ul, .prose ol { padding-left: 20px; }
.prose table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: .93rem; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }
.prose th { background: var(--primary-soft); }

/* faq - native accordion, no JS */
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 8px; }
.faq summary { padding: 13px 15px; font-weight: 600; cursor: pointer; }
.faq details[open] summary { border-bottom: 1px solid var(--border); }
.faq .a { padding: 12px 15px; color: var(--muted); }

/* misc */
.note { font-size: .9rem; color: #6b5a1d; background: #fbf6e3; border: 1px solid #ecdfae; border-radius: var(--radius-sm); padding: 11px 13px; }
.disclaimer { font-size: .82rem; color: var(--muted); margin-top: 14px; }
main section[id] { scroll-margin-top: 96px; }
.related { margin-top: 26px; }
.btn { display: inline-block; background: var(--primary); color: #fff; text-decoration: none; font-weight: 600; padding: 11px 18px; border-radius: var(--radius-sm); border: 0; font-size: 1rem; cursor: pointer; }
.btn:hover { background: var(--primary-dark); }
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.pill { background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 5px 12px; font-size: .85rem; text-decoration: none; color: var(--muted); }
.pill:hover { border-color: var(--primary); color: var(--primary-dark); }

/* footer */
.site-footer { background: #13211b; color: #b9c6bf; font-size: .9rem; margin-top: 40px; }
.site-footer .bar { max-width: var(--maxw-wide); margin: 0 auto; padding: 26px 18px; display: flex; flex-wrap: wrap; gap: 20px 44px; }
.site-footer h4 { color: #fff; font-size: .95rem; margin: 0 0 8px; }
.site-footer a { color: #b9c6bf; text-decoration: none; display: block; padding: 2px 0; }
.site-footer a:hover { color: #fff; }
.site-footer .legal { width: 100%; border-top: 1px solid #2a3a31; padding-top: 14px; color: #8a9991; font-size: .82rem; }

@media (max-width: 540px) {
  body { font-size: 16px; }
  h1 { font-size: 1.55rem; }
  .hero h1 { font-size: 1.7rem; }
  .result-primary { font-size: 2rem; }
  .site-header .bar { gap: 10px; }
}