:root {
  --bg: #efe6d6;
  --bg-2: #e7dcc8;
  --ink: #1c1915;
  --muted: #5e564c;
  --navy: #173042;
  --navy-2: #102430;
  --paper: #fffaf3;
  --line: #e3d5c0;
  --green: #1d6b45;
  --green-2: #144d32;
  --gold: #9a6230;
  --chip: #f3e7d4;
  --shadow: 0 18px 40px rgba(23, 48, 66, 0.08);
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, serif;
  --sans: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 420px at 10% -10%, #f7f1e6 0%, transparent 55%),
    linear-gradient(180deg, #f6f0e6 0%, var(--bg) 280px);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.6;
}
a { color: var(--green-2); }
a:hover { color: var(--gold); }
img { max-width: 100%; }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--navy);
  color: white;
  padding: 0.5rem 0.8rem;
  z-index: 20;
}
.skip:focus { top: 0.5rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  background: rgba(16, 36, 48, 0.96);
  color: #f6f1e8;
  border-bottom: 3px solid var(--gold);
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
  margin-right: auto;
}
.brand strong { display: block; font-family: var(--serif); font-size: 1.15rem; letter-spacing: -0.02em; }
.brand small { display: block; color: #d9c7aa; font-size: 0.75rem; }
.mark {
  width: 2.6rem;
  height: 2.6rem;
  display: grid;
  place-items: center;
  background: #f4e2c4;
  color: var(--navy);
  font-family: var(--serif);
  font-weight: 700;
  border-radius: 0.4rem;
}
.mark span { font-size: 0.72rem; }
.nav-toggle {
  display: none;
  background: transparent;
  color: #f6f1e8;
  border: 1px solid #d9c7aa;
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
}
.nav-links { display: flex; align-items: center; gap: 0.35rem 1rem; }
.nav-links a, .nav-links summary {
  color: #f6f1e8;
  text-decoration: none;
  font-size: 0.95rem;
}
.nav-links a[aria-current="page"] { color: #f4e2c4; }
.nav-links details { position: relative; }
.nav-links summary { cursor: pointer; list-style: none; }
.nav-links summary::-webkit-details-marker { display: none; }
.nav-links details div {
  position: absolute;
  right: 0;
  top: 1.8rem;
  background: var(--paper);
  color: var(--ink);
  min-width: 240px;
  padding: 0.6rem;
  border-radius: 0.6rem;
  box-shadow: var(--shadow);
  display: grid;
}
.nav-links details a { color: var(--navy); padding: 0.35rem 0.4rem; }

.wrap { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }
.hero { padding: 2.2rem 0 1rem; }
.kicker {
  margin: 0 0 0.4rem;
  color: var(--gold);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
}
h1, h2, h3 { font-family: var(--serif); line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.1rem, 4vw, 3.4rem); margin: 0 0 0.6rem; }
h2 { font-size: clamp(1.5rem, 2.4vw, 2rem); margin: 2.2rem 0 0.7rem; }
h3 { font-size: 1.25rem; margin: 1.4rem 0 0.4rem; }
.lede { font-size: 1.18rem; max-width: 42rem; margin-top: 0; }
.answer {
  background: var(--paper);
  border-left: 4px solid var(--green);
  padding: 0.9rem 1rem;
  margin: 1rem 0 1.4rem;
  box-shadow: var(--shadow);
}
.answer p { margin: 0.3rem 0; }

.calc {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: var(--shadow);
}
.calc-stack { grid-template-columns: 1fr 1fr; }
.modes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.45rem; margin-bottom: 0.9rem; }
.mode {
  text-align: left;
  background: var(--chip);
  border: 1px solid transparent;
  border-radius: 0.7rem;
  padding: 0.55rem 0.65rem;
  cursor: pointer;
  color: var(--ink);
  font: inherit;
}
.mode strong { display: block; font-size: 0.92rem; }
.mode span { display: block; color: var(--muted); font-size: 0.75rem; line-height: 1.3; }
.mode.is-on { background: var(--navy); color: white; border-color: var(--navy); }
.mode.is-on span { color: #d9c7aa; }
.field { display: grid; gap: 0.3rem; margin: 0.55rem 0; font-weight: 650; }
.field span, .check { font-weight: 650; }
.field input, .field select, .suffix input {
  width: 100%;
  font: inherit;
  font-size: 1.15rem;
  padding: 0.7rem 0.75rem;
  border-radius: 0.65rem;
  border: 1px solid #d9cbb6;
  background: white;
  color: var(--ink);
}
.field input:focus, .field select:focus, .suffix input:focus, .mode:focus, .btn:focus, .chip:focus, .nav-toggle:focus {
  outline: 3px solid #e2b56a;
  outline-offset: 1px;
}
.suffix { display: flex; align-items: center; gap: 0.4rem; }
.suffix i { font-style: normal; color: var(--muted); }
.rate-row, .split { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.35rem; margin: 0.2rem 0 0.6rem; }
.chip, .btn {
  font: inherit;
  cursor: pointer;
  border-radius: 999px;
  border: 1px solid #d9cbb6;
  background: white;
  padding: 0.35rem 0.7rem;
}
.chip:hover, .btn:hover { border-color: var(--green); }
.actions { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.4rem; }
.btn-ghost { background: transparent; }
.calc-out {
  background: var(--navy);
  color: #f7f1e8;
  border-radius: 0.8rem;
  padding: 1rem 1rem 1.1rem;
}
.calc-out a { color: #f4e2c4; }
.eyebrow { margin: 0; letter-spacing: 0.14em; text-transform: uppercase; font-size: 0.72rem; color: #e2b56a; }
.figures { margin: 0.6rem 0; display: grid; gap: 0.45rem; }
.figures div { display: flex; justify-content: space-between; gap: 1rem; border-bottom: 1px solid rgba(255,255,255,0.08); padding-bottom: 0.35rem; }
.figures dt { color: #d9c7aa; font-weight: 500; }
.figures dd { margin: 0; font-variant-numeric: tabular-nums; font-family: var(--serif); font-size: 1.25rem; }
.fig-strong dd { font-size: 1.7rem; color: #fff; }
.bar { height: 0.55rem; background: rgba(255,255,255,0.12); border-radius: 99px; overflow: hidden; margin: 0.4rem 0; }
.bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #e2b56a, #f3e7d4); }
.formula, .compare, .hint, .copied, .result-prose { margin: 0.35rem 0 0; font-size: 0.92rem; color: #f3e7d4; }
.lead-tight { margin-top: 0; color: var(--muted); }
.check { display: flex; gap: 0.5rem; align-items: flex-start; margin: 0.4rem 0 0.8rem; }
.check input { margin-top: 0.35rem; }

.section { padding-bottom: 0.5rem; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  padding: 1rem 1.1rem;
}
.card h3 { margin-top: 0; }
.note {
  background: #f8efe2;
  border-radius: 0.8rem;
  padding: 0.8rem 1rem;
}
table { width: 100%; border-collapse: collapse; background: var(--paper); font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 0.55rem 0.65rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--navy); color: #f7f1e8; font-weight: 600; }
tr:nth-child(even) td { background: #fbf6ee; }
.table-wrap { overflow-x: auto; border-radius: 0.8rem; border: 1px solid var(--line); }
.crumbs { color: var(--muted); font-size: 0.9rem; margin: 1rem 0; }
.crumbs a { color: inherit; }
article p, article li { max-width: 46rem; }
ol.steps { padding-left: 1.2rem; }
.faq details {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  padding: 0.7rem 0.9rem;
  margin: 0.5rem 0;
}
.faq summary { cursor: pointer; font-weight: 700; }
.sources { font-size: 0.92rem; color: var(--muted); }
.site-footer {
  margin-top: 3rem;
  background: var(--navy-2);
  color: #e7dcc8;
  padding: 1.5rem 0 2rem;
}
.site-footer a { color: #f4e2c4; }
.foot-grid { display: flex; flex-wrap: wrap; gap: 0.5rem 1.2rem; }
.legal { font-size: 0.88rem; max-width: 48rem; }

@media (max-width: 860px) {
  .nav-toggle { display: inline-block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--navy-2);
    padding: 0.8rem 1rem 1rem;
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-links.is-open { display: flex; }
  .nav-links details div { position: static; box-shadow: none; background: transparent; padding: 0.2rem 0 0.2rem 0.6rem; }
  .nav-links details a { color: #f6f1e8; }
  .calc, .calc-stack, .grid-2, .modes, .rate-row, .split { grid-template-columns: 1fr; }
  .site-header { flex-wrap: wrap; }
}

@media print {
  .site-header, .site-footer, .actions, .chips, .nav-toggle { display: none !important; }
  body { background: white; }
  .calc-out { color: black; background: white; border: 1px solid #ccc; }
  .figures dt { color: black; }
}