/* Clean, credible, mobile-first. No frameworks, no external requests. */

:root {
  --ink: #1f2937;
  --muted: #5b6472;
  --line: #d7dde5;
  --bg: #ffffff;
  --wash: #f4f6f8;
  --accent: #1d5c3f;
  --accent-ink: #ffffff;
  --warn-bg: #fff8e6;
  --warn-line: #e3c878;
  --radius: 10px;
  --maxw: 46rem;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 1.0625rem;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.1rem; }

/* Header / nav */
.site-header { border-bottom: 1px solid var(--line); background: var(--bg); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; padding-top: .8rem; padding-bottom: .8rem; }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--ink); text-decoration: none; }
.brand span { color: var(--accent); }
.site-nav a { margin-left: 1rem; color: var(--muted); text-decoration: none; font-size: .95rem; }
.site-nav a:hover { color: var(--ink); text-decoration: underline; }
.site-nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }

/* Hero */
.hero { background: var(--wash); border-bottom: 1px solid var(--line); padding: 2rem 0 1.6rem; }
.hero h1 { margin: 0 0 .4rem; font-size: 1.75rem; line-height: 1.25; }
.hero p.lede { margin: 0; color: var(--muted); max-width: 38rem; }
.hero .caveat { margin-top: .8rem; font-size: .9rem; }

/* Calculator card */
.calc { border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; margin: 1.5rem 0; background: #fff; }
.calc h2 { margin-top: 0; font-size: 1.25rem; }
fieldset { border: 1px solid var(--line); border-radius: 8px; padding: .9rem 1rem 1rem; margin: 0 0 1rem; }
legend { font-weight: 600; padding: 0 .4rem; }
label { display: block; font-size: .95rem; margin: .55rem 0 .2rem; }
input[type="number"], select {
  width: 100%; max-width: 22rem;
  font: inherit; padding: .55rem .7rem;
  border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink);
}
input[type="number"]:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.hint { font-size: .85rem; color: var(--muted); margin: .15rem 0 0; }
.check { display: flex; gap: .6rem; align-items: flex-start; margin-top: .6rem; }
.check input { margin-top: .35rem; }

/* Results */
.results { border: 1px solid var(--line); border-radius: var(--radius); background: var(--wash); padding: 1.25rem; margin: 1.5rem 0; }
.results h2 { margin-top: 0; font-size: 1.25rem; }
.total-range { font-size: 1.6rem; font-weight: 700; margin: .4rem 0 .2rem; }
.total-range .mid { font-weight: 400; color: var(--muted); font-size: 1rem; }
.per-unit { color: var(--muted); font-size: .95rem; margin: 0 0 .8rem; }
table.lines { width: 100%; border-collapse: collapse; font-size: .95rem; margin: .6rem 0; }
table.lines th, table.lines td { text-align: left; padding: .45rem .3rem; border-bottom: 1px solid var(--line); }
table.lines th:last-child, table.lines td:last-child,
table.lines th:nth-child(2), table.lines td:nth-child(2) { text-align: right; }
.notice {
  background: var(--warn-bg); border: 1px solid var(--warn-line);
  border-radius: 8px; padding: .7rem .9rem; font-size: .9rem; margin-top: .9rem;
}
.sources { font-size: .8rem; color: var(--muted); margin-top: .9rem; }
.sources summary { cursor: pointer; font-weight: 600; }

/* Guides */
.prose h2 { margin-top: 2rem; font-size: 1.35rem; }
.prose h3 { margin-top: 1.4rem; font-size: 1.1rem; }
table.compare { width: 100%; border-collapse: collapse; font-size: .92rem; margin: 1rem 0; display: block; overflow-x: auto; }
table.compare th, table.compare td { border: 1px solid var(--line); padding: .5rem .6rem; text-align: left; vertical-align: top; }
table.compare th { background: var(--wash); }
.card-grid { display: grid; gap: 1rem; margin: 1.2rem 0; }
@media (min-width: 40rem) { .card-grid { grid-template-columns: 1fr 1fr; } }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.1rem; }
.card h3 { margin: 0 0 .4rem; font-size: 1.05rem; }
.card p { margin: 0 0 .6rem; font-size: .95rem; color: var(--muted); }
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  text-decoration: none; padding: .6rem 1.1rem; border-radius: 8px; font-weight: 600; font-size: .95rem;
}
.btn:hover { filter: brightness(1.08); }

/* FAQ */
.faq details { border: 1px solid var(--line); border-radius: 8px; margin: .6rem 0; padding: .7rem .9rem; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: .5rem 0 0; font-size: .95rem; }

/* Lead-gen placeholder (INERT) */
.lead-box { border: 2px dashed var(--line); border-radius: var(--radius); padding: 1.25rem; margin: 2rem 0; background: #fbfcfd; }
.lead-box h2 { margin-top: 0; font-size: 1.2rem; }
.lead-box .soon { display: none; background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: 8px; padding: .6rem .8rem; margin-top: .8rem; font-size: .92rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 2.5rem; padding: 1.4rem 0 2rem; color: var(--muted); font-size: .88rem; }
.site-footer nav a { margin-right: 1rem; color: var(--muted); }
.disclaimer { margin-top: .8rem; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }