* { box-sizing: border-box; }
:root {
  --navy: #0f2a44; --blue: #2563a8; --blue-dark: #1d4f85; --sky: #eaf3fc;
  --gold: #f2b705; --gold-dark: #7a5a00; --bg: #f6f8fb; --text: #1a202c;
  --muted: #4a5568; --border: #d9e2ec; --white: #fff;
}
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text); background: var(--bg);
  display: flex; flex-direction: column; min-height: 100vh; min-height: 100dvh;
}
main { flex: 1; width: 100%; }
.site-header, .site-footer { flex-shrink: 0; }
button, input, textarea, select { font-family: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }
a { color: var(--blue); text-underline-offset: .15em; }
a:hover { color: var(--blue-dark); }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--gold); color: var(--navy); padding: .6em 1em; font-weight: 700; z-index: 10; }
.skip-link:focus { left: 0; }
.header-inner, .footer-inner, .wrap { max-width: 880px; margin: 0 auto; }
.site-header { background: var(--navy); color: #fff; border-bottom: 4px solid var(--gold); }
.header-inner { padding: 1rem 1rem .9rem; display: flex; flex-direction: column; gap: .7rem; }
.brand { color: #fff; text-decoration: none; font-size: 1.25rem; font-weight: 800; line-height: 1.2; }
.brand span { color: var(--gold); }
.site-nav, .footer-nav { display: flex; flex-wrap: wrap; gap: .25rem .75rem; }
.site-nav a, .footer-nav a { display: inline-flex; align-items: center; min-height: 48px; padding: .4rem .5rem; text-decoration: none; }
.site-nav a { color: #dbeafe; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: #fff; text-decoration: underline; text-underline-offset: .3em; }
.wrap { padding: 1.25rem 1rem 2.5rem; }
h1 { font-size: clamp(1.6rem, 5vw, 2.3rem); line-height: 1.2; color: var(--navy); margin: .2rem 0 .6rem; }
h2 { font-size: 1.4rem; line-height: 1.3; color: var(--navy); margin: 2rem 0 .6rem; }
h3 { font-size: 1.1rem; color: var(--navy); margin: 1.2rem 0 .3rem; }
p { margin: 0 0 1rem; }
.lede { color: var(--muted); font-size: 1.05rem; }
.card { background: var(--white); border: 1px solid var(--border); border-radius: 12px; padding: 1.25rem; box-shadow: 0 2px 10px rgba(15,42,68,.06); }
.gold-rule { border: 0; border-top: 4px solid var(--gold); margin: 1.5rem 0; }
.tabs { display: flex; gap: .5rem; border-bottom: 2px solid var(--border); margin-bottom: 1.25rem; }
.tab { flex: 1; min-height: 48px; padding: .7rem .4rem; border: 0; border-bottom: 3px solid transparent; background: transparent; font-size: 1rem; font-weight: 700; color: var(--muted); cursor: pointer; }
.tab:hover { color: var(--blue); }
.tab[aria-selected="true"] { color: var(--blue); border-bottom-color: var(--blue); }
.panel { display: none; }
.panel.active { display: block; }
.field { margin-bottom: 1rem; }
.field label { display: block; font-weight: 700; margin-bottom: .4rem; }
.input-row { display: flex; align-items: stretch; border: 2px solid var(--border); border-radius: 8px; overflow: hidden; background: var(--white); }
.input-row:focus-within { border-color: var(--blue); }
.input-row input { flex: 1; min-width: 0; border: 0; outline: 0; padding: 0 1rem; font-size: 1.1rem; height: 52px; }
.unit { display: flex; align-items: center; padding: 0 1rem; background: var(--bg); border-left: 1px solid var(--border); font-weight: 700; color: var(--muted); }
.hint, .note { color: var(--muted); font-size: .9rem; }
.hint { margin-top: .3rem; }
.decimal-row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin: 1rem 0; }
.decimal-row span { font-weight: 700; }
.decimal-btn { min-width: 48px; min-height: 48px; padding: .5rem .8rem; border: 2px solid var(--border); border-radius: 8px; background: var(--white); font-weight: 700; cursor: pointer; }
.decimal-btn[aria-pressed="true"] { background: var(--blue); border-color: var(--blue); color: #fff; }
.result { background: var(--sky); border: 2px solid var(--blue); border-radius: 8px; padding: 1rem 1.1rem; margin: 1rem 0; }
.result-label { color: var(--muted); font-size: .9rem; }
.result-main { font-size: clamp(1.5rem, 6vw, 2rem); font-weight: 800; color: var(--navy); line-height: 1.25; }
.result-lines { color: var(--muted); margin-top: .3rem; white-space: pre-line; }
.btn { display: inline-block; min-height: 48px; padding: .7rem 1.1rem; border: 0; border-radius: 8px; background: var(--blue); color: #fff; font-size: 1rem; font-weight: 700; cursor: pointer; text-decoration: none; text-align: center; }
.btn:hover { background: var(--blue-dark); color: #fff; }
.btn-secondary { background: var(--white); color: var(--navy); border: 2px solid var(--border); }
.btn-secondary:hover { background: var(--bg); color: var(--navy); }
.answer-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.answer-card { background: var(--white); border: 1px solid var(--border); border-top: 4px solid var(--gold); border-radius: 12px; padding: 1rem 1.1rem; }
.answer-card strong { display: block; font-size: 1.35rem; color: var(--navy); }
.answer-card span { color: var(--muted); }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; background: var(--white); margin: 1rem 0; }
th { background: var(--navy); color: #fff; padding: .75rem; text-align: left; }
td { padding: .65rem .75rem; border-bottom: 1px solid var(--border); }
tbody tr:nth-child(even) td { background: #f1f5f9; }
.callout { background: #fff8e1; border-left: 4px solid var(--gold); padding: 1rem 1.1rem; border-radius: 0 8px 8px 0; margin: 1rem 0; }
.callout strong { color: var(--gold-dark); }
.faq h3 { margin-top: 1.4rem; }
.site-footer { background: var(--navy); color: #dbeafe; border-top: 4px solid var(--gold); }
.footer-inner { padding: 1.5rem 1rem 2rem; }
.footer-inner a { color: #fff; }
.footer-nav { margin: .5rem 0; }
@media (min-width: 600px) {
  .header-inner { flex-direction: row; align-items: center; justify-content: space-between; }
  .answer-grid { grid-template-columns: repeat(3, 1fr); }
  .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
  .two-col .field { margin-bottom: 0; }
}
@media (max-width: 360px) {
  body { font-size: 16px; }
  .tab { font-size: .9rem; }
  .result-main { font-size: 1.4rem; }
}